insideout10/wordlift-plugin-js

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app/admin_files/media-views.js

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/* global _wpMediaViewsL10n, confirm, getUserSetting, setUserSetting */
(function($){
    var media       = wp.media,
        Attachment  = media.model.Attachment,
        Attachments = media.model.Attachments,
        l10n;

    // Link any localized strings.
    l10n = media.view.l10n = typeof _wpMediaViewsL10n === 'undefined' ? {} : _wpMediaViewsL10n;

    // Link any settings.
    media.view.settings = l10n.settings || {};
    delete l10n.settings;

    // Copy the `post` setting over to the model settings.
    media.model.settings.post = media.view.settings.post;

    // Check if the browser supports CSS 3.0 transitions
    $.support.transition = (function(){
        var style = document.documentElement.style,
            transitions = {
                WebkitTransition: 'webkitTransitionEnd',
                MozTransition:    'transitionend',
                OTransition:      'oTransitionEnd otransitionend',
                transition:       'transitionend'
            }, transition;

        transition = _.find( _.keys( transitions ), function( transition ) {
            return ! _.isUndefined( style[ transition ] );
        });

        return transition && {
            end: transitions[ transition ]
        };
    }());

    // Makes it easier to bind events using transitions.
    media.transition = function( selector, sensitivity ) {
        var deferred = $.Deferred();

        sensitivity = sensitivity || 2000;

        if ( $.support.transition ) {
            if ( ! (selector instanceof $) )
                selector = $( selector );

            // Resolve the deferred when the first element finishes animating.
            selector.first().one( $.support.transition.end, deferred.resolve );

            // Just in case the event doesn't trigger, fire a callback.
            _.delay( deferred.resolve, sensitivity );

        // Otherwise, execute on the spot.
        } else {
            deferred.resolve();
        }

        return deferred.promise();
    };

    /**
     * ========================================================================
     * CONTROLLERS
     * ========================================================================
     */

    /**
     * wp.media.controller.Region
     */
    media.controller.Region = function( options ) {
        _.extend( this, _.pick( options || {}, 'id', 'view', 'selector' ) );
    };

    // Use Backbone's self-propagating `extend` inheritance method.
    media.controller.Region.extend = Backbone.Model.extend;

    _.extend( media.controller.Region.prototype, {
        mode: function( mode ) {
            if ( ! mode )
                return this._mode;

            // Bail if we're trying to change to the current mode.
            if ( mode === this._mode )
                return this;

            this.trigger('deactivate');
            this._mode = mode;
            this.render( mode );
            this.trigger('activate');
            return this;
        },

        render: function( mode ) {
            // If no mode is provided, just re-render the current mode.
            // If the provided mode isn't active, perform a full switch.
            if ( mode && mode !== this._mode )
                return this.mode( mode );

            var set = { view: null },
                view;

            this.trigger( 'create', set );
            view = set.view;
            this.trigger( 'render', view );
            if ( view )
                this.set( view );
            return this;
        },

        get: function() {
            return this.view.views.first( this.selector );
        },

        set: function( views, options ) {
            if ( options )
                options.add = false;
            return this.view.views.set( this.selector, views, options );
        },

        trigger: function( event ) {
            var base, args;

            if ( ! this._mode )
                return;

            args = _.toArray( arguments );
            base = this.id + ':' + event;

            // Trigger `region:action:mode` event.
            args[0] = base + ':' + this._mode;
            this.view.trigger.apply( this.view, args );

            // Trigger `region:action` event.
            args[0] = base;
            this.view.trigger.apply( this.view, args );
            return this;
        }
    });

    /**
     * wp.media.controller.StateMachine
     */
    media.controller.StateMachine = function( states ) {
        this.states = new Backbone.Collection( states );
    };

    // Use Backbone's self-propagating `extend` inheritance method.
    media.controller.StateMachine.extend = Backbone.Model.extend;

    // Add events to the `StateMachine`.
    _.extend( media.controller.StateMachine.prototype, Backbone.Events, {

        // Fetch a state.
        //
        // If no `id` is provided, returns the active state.
        //
        // Implicitly creates states.
        state: function( id ) {
            // Ensure that the `states` collection exists so the `StateMachine`
            // can be used as a mixin.
            this.states = this.states || new Backbone.Collection();

            // Default to the active state.
            id = id || this._state;

            if ( id && ! this.states.get( id ) )
                this.states.add({ id: id });
            return this.states.get( id );
        },

        // Sets the active state.
        setState: function( id ) {
            var previous = this.state();

            // Bail if we're trying to select the current state, if we haven't
            // created the `states` collection, or are trying to select a state
            // that does not exist.
            if ( ( previous && id === previous.id ) || ! this.states || ! this.states.get( id ) )
                return this;

            if ( previous ) {
                previous.trigger('deactivate');
                this._lastState = previous.id;
            }

            this._state = id;
            this.state().trigger('activate');

            return this;
        },

        // Returns the previous active state.
        //
        // Call the `state()` method with no parameters to retrieve the current
        // active state.
        lastState: function() {
            if ( this._lastState )
                return this.state( this._lastState );
        }
    });

    // Map methods from the `states` collection to the `StateMachine` itself.
    _.each([ 'on', 'off', 'trigger' ], function( method ) {
        media.controller.StateMachine.prototype[ method ] = function() {
            // Ensure that the `states` collection exists so the `StateMachine`
            // can be used as a mixin.
            this.states = this.states || new Backbone.Collection();
            // Forward the method to the `states` collection.
            this.states[ method ].apply( this.states, arguments );
            return this;
        };
    });


    // wp.media.controller.State
    // ---------------------------
    media.controller.State = Backbone.Model.extend({
        constructor: function() {
            this.on( 'activate', this._preActivate, this );
            this.on( 'activate', this.activate, this );
            this.on( 'activate', this._postActivate, this );
            this.on( 'deactivate', this._deactivate, this );
            this.on( 'deactivate', this.deactivate, this );
            this.on( 'reset', this.reset, this );
            this.on( 'ready', this._ready, this );
            this.on( 'ready', this.ready, this );
            Backbone.Model.apply( this, arguments );
            this.on( 'change:menu', this._updateMenu, this );
        },

        ready: function() {},
        activate: function() {},
        deactivate: function() {},
        reset: function() {},

        _ready: function() {
            this._updateMenu();
        },

        _preActivate: function() {
            this.active = true;
        },

        _postActivate: function() {
            this.on( 'change:menu', this._menu, this );
            this.on( 'change:titleMode', this._title, this );
            this.on( 'change:content', this._content, this );
            this.on( 'change:toolbar', this._toolbar, this );

            this.frame.on( 'title:render:default', this._renderTitle, this );

            this._title();
            this._menu();
            this._toolbar();
            this._content();
            this._router();
        },


        _deactivate: function() {
            this.active = false;

            this.frame.off( 'title:render:default', this._renderTitle, this );

            this.off( 'change:menu', this._menu, this );
            this.off( 'change:titleMode', this._title, this );
            this.off( 'change:content', this._content, this );
            this.off( 'change:toolbar', this._toolbar, this );
        },

        _title: function() {
            this.frame.title.render( this.get('titleMode') || 'default' );
        },

        _renderTitle: function( view ) {
            view.$el.text( this.get('title') || '' );
        },

        _router: function() {
            var router = this.frame.router,
                mode = this.get('router'),
                view;

            this.frame.$el.toggleClass( 'hide-router', ! mode );
            if ( ! mode )
                return;

            this.frame.router.render( mode );

            view = router.get();
            if ( view && view.select )
                view.select( this.frame.content.mode() );
        },

        _menu: function() {
            var menu = this.frame.menu,
                mode = this.get('menu'),
                view;

            if ( ! mode )
                return;

            menu.mode( mode );

            view = menu.get();
            if ( view && view.select )
                view.select( this.id );
        },

        _updateMenu: function() {
            var previous = this.previous('menu'),
                menu = this.get('menu');

            if ( previous )
                this.frame.off( 'menu:render:' + previous, this._renderMenu, this );

            if ( menu )
                this.frame.on( 'menu:render:' + menu, this._renderMenu, this );
        },

        _renderMenu: function( view ) {
            var menuItem = this.get('menuItem'),
                title = this.get('title'),
                priority = this.get('priority');

            if ( ! menuItem && title ) {
                menuItem = { text: title };

                if ( priority )
                    menuItem.priority = priority;
            }

            if ( ! menuItem )
                return;

            view.set( this.id, menuItem );
        }
    });

    _.each(['toolbar','content'], function( region ) {
        media.controller.State.prototype[ '_' + region ] = function() {
            var mode = this.get( region );
            if ( mode )
                this.frame[ region ].render( mode );
        };
    });

    // wp.media.controller.Library
    // ---------------------------
    media.controller.Library = media.controller.State.extend({
        defaults: {
            id:         'library',
            multiple:   false, // false, 'add', 'reset'
            describe:   false,
            toolbar:    'select',
            sidebar:    'settings',
            content:    'upload',
            router:     'browse',
            menu:       'default',
            searchable: true,
            filterable: false,
            sortable:   true,
            title:      l10n.mediaLibraryTitle,

            // Uses a user setting to override the content mode.
            contentUserSetting: true,

            // Sync the selection from the last state when 'multiple' matches.
            syncSelection: true
        },

        initialize: function() {
            var selection = this.get('selection'),
                props;

            // If a library isn't provided, query all media items.
            if ( ! this.get('library') )
                this.set( 'library', media.query() );

            // If a selection instance isn't provided, create one.
            if ( ! (selection instanceof media.model.Selection) ) {
                props = selection;

                if ( ! props ) {
                    props = this.get('library').props.toJSON();
                    props = _.omit( props, 'orderby', 'query' );
                }

                // If the `selection` attribute is set to an object,
                // it will use those values as the selection instance's
                // `props` model. Otherwise, it will copy the library's
                // `props` model.
                this.set( 'selection', new media.model.Selection( null, {
                    multiple: this.get('multiple'),
                    props: props
                }) );
            }

            if ( ! this.get('edge') )
                this.set( 'edge', 120 );

            if ( ! this.get('gutter') )
                this.set( 'gutter', 8 );

            this.resetDisplays();
        },

        activate: function() {
            this.syncSelection();

            wp.Uploader.queue.on( 'add', this.uploading, this );

            this.get('selection').on( 'add remove reset', this.refreshContent, this );

            if ( this.get('contentUserSetting') ) {
                this.frame.on( 'content:activate', this.saveContentMode, this );
                this.set( 'content', getUserSetting( 'libraryContent', this.get('content') ) );
            }
        },

        deactivate: function() {
            this.recordSelection();

            this.frame.off( 'content:activate', this.saveContentMode, this );

            // Unbind all event handlers that use this state as the context
            // from the selection.
            this.get('selection').off( null, null, this );

            wp.Uploader.queue.off( null, null, this );
        },

        reset: function() {
            this.get('selection').reset();
            this.resetDisplays();
            this.refreshContent();
        },

        resetDisplays: function() {
            var defaultProps = media.view.settings.defaultProps;
            this._displays = [];
            this._defaultDisplaySettings = {
                align: defaultProps.align || getUserSetting( 'align', 'none' ),
                size:  defaultProps.size  || getUserSetting( 'imgsize', 'medium' ),
                link:  defaultProps.link  || getUserSetting( 'urlbutton', 'file' )
            };
        },

        display: function( attachment ) {
            var displays = this._displays;

            if ( ! displays[ attachment.cid ] )
                displays[ attachment.cid ] = new Backbone.Model( this.defaultDisplaySettings( attachment ) );

            return displays[ attachment.cid ];
        },

        defaultDisplaySettings: function( attachment ) {
            var settings = this._defaultDisplaySettings;
            if ( settings.canEmbed = this.canEmbed( attachment ) )
                settings.link = 'embed';
            return settings;
        },

        canEmbed: function( attachment ) {
            // If uploading, we know the filename but not the mime type.
            if ( ! attachment.get('uploading') ) {
                var type = attachment.get('type');
                if ( type !== 'audio' && type !== 'video' )
                    return false;
            }

            return _.contains( media.view.settings.embedExts, attachment.get('filename').split('.').pop() );
        },

        syncSelection: function() {
            var selection = this.get('selection'),
                manager = this.frame._selection;

            if ( ! this.get('syncSelection') || ! manager || ! selection )
                return;

            // If the selection supports multiple items, validate the stored
            // attachments based on the new selection's conditions. Record
            // the attachments that are not included; we'll maintain a
            // reference to those. Other attachments are considered in flux.
            if ( selection.multiple ) {
                selection.reset( [], { silent: true });
                selection.validateAll( manager.attachments );
                manager.difference = _.difference( manager.attachments.models, selection.models );
            }

            // Sync the selection's single item with the master.
            selection.single( manager.single );
        },

        recordSelection: function() {
            var selection = this.get('selection'),
                manager = this.frame._selection;

            if ( ! this.get('syncSelection') || ! manager || ! selection )
                return;

            // Record the currently active attachments, which is a combination
            // of the selection's attachments and the set of selected
            // attachments that this specific selection considered invalid.
            // Reset the difference and record the single attachment.
            if ( selection.multiple ) {
                manager.attachments.reset( selection.toArray().concat( manager.difference ) );
                manager.difference = [];
            } else {
                manager.attachments.add( selection.toArray() );
            }

            manager.single = selection._single;
        },

        refreshContent: function() {
            var selection = this.get('selection'),
                frame = this.frame,
                router = frame.router.get(),
                mode = frame.content.mode();

            // If the state is active, no items are selected, and the current
            // content mode is not an option in the state's router (provided
            // the state has a router), reset the content mode to the default.
            if ( this.active && ! selection.length && router && ! router.get( mode ) )
                this.frame.content.render( this.get('content') );
        },

        uploading: function( attachment ) {
            var content = this.frame.content;

            // If the uploader was selected, navigate to the browser.
            if ( 'upload' === content.mode() )
                this.frame.content.mode('browse');

            // Automatically select any uploading attachments.
            //
            // Selections that don't support multiple attachments automatically
            // limit themselves to one attachment (in this case, the last
            // attachment in the upload queue).
            this.get('selection').add( attachment );
        },

        saveContentMode: function() {
            // Only track the browse router on library states.
            if ( 'browse' !== this.get('router') )
                return;

            var mode = this.frame.content.mode(),
                view = this.frame.router.get();

            if ( view && view.get( mode ) )
                setUserSetting( 'libraryContent', mode );
        }
    });

    // wp.media.controller.GalleryEdit
    // -------------------------------
    media.controller.GalleryEdit = media.controller.Library.extend({
        defaults: {
            id:         'gallery-edit',
            multiple:   false,
            describe:   true,
            edge:       199,
            editing:    false,
            sortable:   true,
            searchable: false,
            toolbar:    'gallery-edit',
            content:    'browse',
            title:      l10n.editGalleryTitle,
            priority:   60,
            dragInfo:   true,

            // Don't sync the selection, as the Edit Gallery library
            // *is* the selection.
            syncSelection: false
        },

        initialize: function() {
            // If we haven't been provided a `library`, create a `Selection`.
            if ( ! this.get('library') )
                this.set( 'library', new media.model.Selection() );

            // The single `Attachment` view to be used in the `Attachments` view.
            if ( ! this.get('AttachmentView') )
                this.set( 'AttachmentView', media.view.Attachment.EditLibrary );
            media.controller.Library.prototype.initialize.apply( this, arguments );
        },

        activate: function() {
            var library = this.get('library');

            // Limit the library to images only.
            library.props.set( 'type', 'image' );

            // Watch for uploaded attachments.
            this.get('library').observe( wp.Uploader.queue );

            this.frame.on( 'content:render:browse', this.gallerySettings, this );

            media.controller.Library.prototype.activate.apply( this, arguments );
        },

        deactivate: function() {
            // Stop watching for uploaded attachments.
            this.get('library').unobserve( wp.Uploader.queue );

            this.frame.off( 'content:render:browse', this.gallerySettings, this );

            media.controller.Library.prototype.deactivate.apply( this, arguments );
        },

        gallerySettings: function( browser ) {
            var library = this.get('library');

            if ( ! library || ! browser )
                return;

            library.gallery = library.gallery || new Backbone.Model();

            browser.sidebar.set({
                gallery: new media.view.Settings.Gallery({
                    controller: this,
                    model:      library.gallery,
                    priority:   40
                })
            });

            browser.toolbar.set( 'reverse', {
                text:     l10n.reverseOrder,
                priority: 80,

                click: function() {
                    library.reset( library.toArray().reverse() );
                }
            });
        }
    });

    // wp.media.controller.GalleryAdd
    // ---------------------------------
    media.controller.GalleryAdd = media.controller.Library.extend({
        defaults: _.defaults({
            id:           'gallery-library',
            filterable:   'uploaded',
            multiple:     'add',
            menu:         'gallery',
            toolbar:      'gallery-add',
            title:        l10n.addToGalleryTitle,
            priority:     100,

            // Don't sync the selection, as the Edit Gallery library
            // *is* the selection.
            syncSelection: false
        }, media.controller.Library.prototype.defaults ),

        initialize: function() {
            // If we haven't been provided a `library`, create a `Selection`.
            if ( ! this.get('library') )
                this.set( 'library', media.query({ type: 'image' }) );

            media.controller.Library.prototype.initialize.apply( this, arguments );
        },

        activate: function() {
            var library = this.get('library'),
                edit    = this.frame.state('gallery-edit').get('library');

            if ( this.editLibrary && this.editLibrary !== edit )
                library.unobserve( this.editLibrary );

            // Accepts attachments that exist in the original library and
            // that do not exist in gallery's library.
            library.validator = function( attachment ) {
                return !! this.mirroring.get( attachment.cid ) && ! edit.get( attachment.cid ) && media.model.Selection.prototype.validator.apply( this, arguments );
            };

            // Reset the library to ensure that all attachments are re-added
            // to the collection. Do so silently, as calling `observe` will
            // trigger the `reset` event.
            library.reset( library.mirroring.models, { silent: true });
            library.observe( edit );
            this.editLibrary = edit;

            media.controller.Library.prototype.activate.apply( this, arguments );
        }
    });

    // wp.media.controller.FeaturedImage
    // ---------------------------------
    media.controller.FeaturedImage = media.controller.Library.extend({
        defaults: _.defaults({
            id:         'featured-image',
            filterable: 'uploaded',
            multiple:   false,
            toolbar:    'featured-image',
            title:      l10n.setFeaturedImageTitle,
            priority:   60,

            syncSelection: false
        }, media.controller.Library.prototype.defaults ),

        initialize: function() {
            var library, comparator;

            // If we haven't been provided a `library`, create a `Selection`.
            if ( ! this.get('library') )
                this.set( 'library', media.query({ type: 'image' }) );

            media.controller.Library.prototype.initialize.apply( this, arguments );

            library    = this.get('library');
            comparator = library.comparator;

            // Overload the library's comparator to push items that are not in
            // the mirrored query to the front of the aggregate collection.
            library.comparator = function( a, b ) {
                var aInQuery = !! this.mirroring.get( a.cid ),
                    bInQuery = !! this.mirroring.get( b.cid );

                if ( ! aInQuery && bInQuery )
                    return -1;
                else if ( aInQuery && ! bInQuery )
                    return 1;
                else
                    return comparator.apply( this, arguments );
            };

            // Add all items in the selection to the library, so any featured
            // images that are not initially loaded still appear.
            library.observe( this.get('selection') );
        },

        activate: function() {
            this.updateSelection();
            this.frame.on( 'open', this.updateSelection, this );
            media.controller.Library.prototype.activate.apply( this, arguments );
        },

        deactivate: function() {
            this.frame.off( 'open', this.updateSelection, this );
            media.controller.Library.prototype.deactivate.apply( this, arguments );
        },

        updateSelection: function() {
            var selection = this.get('selection'),
                id = media.view.settings.post.featuredImageId,
                attachment;

            if ( '' !== id && -1 !== id ) {
                attachment = Attachment.get( id );
                attachment.fetch();
            }

            selection.reset( attachment ? [ attachment ] : [] );
        }
    });


    // wp.media.controller.Embed
    // -------------------------
    media.controller.Embed = media.controller.State.extend({
        defaults: {
            id:      'embed',
            url:     '',
            menu:    'default',
            content: 'embed',
            toolbar: 'main-embed',
            type:    'link',

            title:    l10n.insertFromUrlTitle,
            priority: 120
        },

        // The amount of time used when debouncing the scan.
        sensitivity: 200,

        initialize: function() {
            this.debouncedScan = _.debounce( _.bind( this.scan, this ), this.sensitivity );
            this.props = new Backbone.Model({ url: '' });
            this.props.on( 'change:url', this.debouncedScan, this );
            this.props.on( 'change:url', this.refresh, this );
            this.on( 'scan', this.scanImage, this );
        },

        scan: function() {
            var scanners,
                embed = this,
                attributes = {
                    type: 'link',
                    scanners: []
                };

            // Scan is triggered with the list of `attributes` to set on the
            // state, useful for the 'type' attribute and 'scanners' attribute,
            // an array of promise objects for asynchronous scan operations.
            if ( this.props.get('url') )
                this.trigger( 'scan', attributes );

            if ( attributes.scanners.length ) {
                scanners = attributes.scanners = $.when.apply( $, attributes.scanners );
                scanners.always( function() {
                    if ( embed.get('scanners') === scanners )
                        embed.set( 'loading', false );
                });
            } else {
                attributes.scanners = null;
            }

            attributes.loading = !! attributes.scanners;
            this.set( attributes );
        },

        scanImage: function( attributes ) {
            var frame = this.frame,
                state = this,
                url = this.props.get('url'),
                image = new Image(),
                deferred = $.Deferred();

            attributes.scanners.push( deferred.promise() );

            // Try to load the image and find its width/height.
            image.onload = function() {
                deferred.resolve();

                if ( state !== frame.state() || url !== state.props.get('url') )
                    return;

                state.set({
                    type: 'image'
                });

                state.props.set({
                    width:  image.width,
                    height: image.height
                });
            };

            image.onerror = deferred.reject;
            image.src = url;
        },

        refresh: function() {
            this.frame.toolbar.get().refresh();
        },

        reset: function() {
            this.props.clear().set({ url: '' });

            if ( this.active )
                this.refresh();
        }
    });

    /**
     * ========================================================================
     * VIEWS
     * ========================================================================
     */

    // wp.media.View
    // -------------
    //
    // The base view class.
    //
    // Undelegating events, removing events from the model, and
    // removing events from the controller mirror the code for
    // `Backbone.View.dispose` in Backbone 0.9.8 development.
    //
    // This behavior has since been removed, and should not be used
    // outside of the media manager.
    media.View = wp.Backbone.View.extend({
        constructor: function( options ) {
            if ( options && options.controller )
                this.controller = options.controller;

            wp.Backbone.View.apply( this, arguments );
        },

        dispose: function() {
            // Undelegating events, removing events from the model, and
            // removing events from the controller mirror the code for
            // `Backbone.View.dispose` in Backbone 0.9.8 development.
            this.undelegateEvents();

            if ( this.model && this.model.off )
                this.model.off( null, null, this );

            if ( this.collection && this.collection.off )
                this.collection.off( null, null, this );

            // Unbind controller events.
            if ( this.controller && this.controller.off )
                this.controller.off( null, null, this );

            return this;
        },

        remove: function() {
            this.dispose();
            return wp.Backbone.View.prototype.remove.apply( this, arguments );
        }
    });

    /**
     * wp.media.view.Frame
     */
    media.view.Frame = media.View.extend({
        initialize: function() {
            this._createRegions();
            this._createStates();
        },

        _createRegions: function() {
            // Clone the regions array.
            this.regions = this.regions ? this.regions.slice() : [];

            // Initialize regions.
            _.each( this.regions, function( region ) {
                this[ region ] = new media.controller.Region({
                    view:     this,
                    id:       region,
                    selector: '.media-frame-' + region
                });
            }, this );
        },

        _createStates: function() {
            // Create the default `states` collection.
            this.states = new Backbone.Collection( null, {
                model: media.controller.State
            });

            // Ensure states have a reference to the frame.
            this.states.on( 'add', function( model ) {
                model.frame = this;
                model.trigger('ready');
            }, this );

            if ( this.options.states )
                this.states.add( this.options.states );
        },

        reset: function() {
            this.states.invoke( 'trigger', 'reset' );
            return this;
        }
    });

    // Make the `Frame` a `StateMachine`.
    _.extend( media.view.Frame.prototype, media.controller.StateMachine.prototype );

    /**
     * wp.media.view.MediaFrame
     */
    media.view.MediaFrame = media.view.Frame.extend({
        className: 'media-frame',
        template:  media.template('media-frame'),
        regions:   ['menu','title','content','toolbar','router'],

        initialize: function() {
            media.view.Frame.prototype.initialize.apply( this, arguments );

            _.defaults( this.options, {
                title:    '',
                modal:    true,
                uploader: true
            });

            // Ensure core UI is enabled.
            this.$el.addClass('wp-core-ui');

            // Initialize modal container view.
            if ( this.options.modal ) {
                this.modal = new media.view.Modal({
                    controller: this,
                    title:      this.options.title
                });

                this.modal.content( this );
            }

            // Force the uploader off if the upload limit has been exceeded or
            // if the browser isn't supported.
            if ( wp.Uploader.limitExceeded || ! wp.Uploader.browser.supported )
                this.options.uploader = false;

            // Initialize window-wide uploader.
            if ( this.options.uploader ) {
                this.uploader = new media.view.UploaderWindow({
                    controller: this,
                    uploader: {
                        dropzone:  this.modal ? this.modal.$el : this.$el,
                        container: this.$el
                    }
                });
                this.views.set( '.media-frame-uploader', this.uploader );
            }

            this.on( 'attach', _.bind( this.views.ready, this.views ), this );

            // Bind default title creation.
            this.on( 'title:create:default', this.createTitle, this );
            this.title.mode('default');

            // Bind default menu.
            this.on( 'menu:create:default', this.createMenu, this );
        },

        render: function() {
            // Activate the default state if no active state exists.
            if ( ! this.state() && this.options.state )
                this.setState( this.options.state );

            return media.view.Frame.prototype.render.apply( this, arguments );
        },

        createTitle: function( title ) {
            title.view = new media.View({
                controller: this,
                tagName: 'h1'
            });
        },

        createMenu: function( menu ) {
            menu.view = new media.view.Menu({
                controller: this
            });
        },

        createToolbar: function( toolbar ) {
            toolbar.view = new media.view.Toolbar({
                controller: this
            });
        },

        createRouter: function( router ) {
            router.view = new media.view.Router({
                controller: this
            });
        },

        createIframeStates: function( options ) {
            var settings = media.view.settings,
                tabs = settings.tabs,
                tabUrl = settings.tabUrl,
                $postId;

            if ( ! tabs || ! tabUrl )
                return;

            // Add the post ID to the tab URL if it exists.
            $postId = $('#post_ID');
            if ( $postId.length )
                tabUrl += '&post_id=' + $postId.val();

            // Generate the tab states.
            _.each( tabs, function( title, id ) {
                this.state( 'iframe:' + id ).set( _.defaults({
                    tab:     id,
                    src:     tabUrl + '&tab=' + id,
                    title:   title,
                    content: 'iframe',
                    menu:    'default'
                }, options ) );
            }, this );

            this.on( 'content:create:iframe', this.iframeContent, this );
            this.on( 'menu:render:default', this.iframeMenu, this );
            this.on( 'open', this.hijackThickbox, this );
            this.on( 'close', this.restoreThickbox, this );
        },

        iframeContent: function( content ) {
            this.$el.addClass('hide-toolbar');
            content.view = new media.view.Iframe({
                controller: this
            });
        },

        iframeMenu: function( view ) {
            var views = {};

            if ( ! view )
                return;

            _.each( media.view.settings.tabs, function( title, id ) {
                views[ 'iframe:' + id ] = {
                    text: this.state( 'iframe:' + id ).get('title'),
                    priority: 200
                };
            }, this );

            view.set( views );
        },

        hijackThickbox: function() {
            var frame = this;

            if ( ! window.tb_remove || this._tb_remove )
                return;

            this._tb_remove = window.tb_remove;
            window.tb_remove = function() {
                frame.close();
                frame.reset();
                frame.setState( frame.options.state );
                frame._tb_remove.call( window );
            };
        },

        restoreThickbox: function() {
            if ( ! this._tb_remove )
                return;

            window.tb_remove = this._tb_remove;
            delete this._tb_remove;
        }
    });

    // Map some of the modal's methods to the frame.
    _.each(['open','close','attach','detach','escape'], function( method ) {
        media.view.MediaFrame.prototype[ method ] = function() {
            if ( this.modal )
                this.modal[ method ].apply( this.modal, arguments );
            return this;
        };
    });

    /**
     * wp.media.view.MediaFrame.Select
     */
    media.view.MediaFrame.Select = media.view.MediaFrame.extend({
        initialize: function() {
            media.view.MediaFrame.prototype.initialize.apply( this, arguments );

            _.defaults( this.options, {
                selection: [],
                library:   {},
                multiple:  false,
                state:    'library'
            });

            this.createSelection();
            this.createStates();
            this.bindHandlers();
        },

        createSelection: function() {
            var selection = this.options.selection;

            if ( ! (selection instanceof media.model.Selection) ) {
                this.options.selection = new media.model.Selection( selection, {
                    multiple: this.options.multiple
                });
            }

            this._selection = {
                attachments: new Attachments(),
                difference: []
            };
        },

        createStates: function() {
            var options = this.options;

            if ( this.options.states )
                return;

            // Add the default states.
            this.states.add([
                // Main states.
                new media.controller.Library({
                    library:   media.query( options.library ),
                    multiple:  options.multiple,
                    title:     options.title,
                    priority:  20
                })
            ]);
        },

        bindHandlers: function() {
            this.on( 'router:create:browse', this.createRouter, this );
            this.on( 'router:render:browse', this.browseRouter, this );
            this.on( 'content:create:browse', this.browseContent, this );
            this.on( 'content:render:upload', this.uploadContent, this );
            this.on( 'toolbar:create:select', this.createSelectToolbar, this );
        },

        // Routers
        browseRouter: function( view ) {
            view.set({
                upload: {
                    text:     l10n.uploadFilesTitle,
                    priority: 20
                },
                browse: {
                    text:     l10n.mediaLibraryTitle,
                    priority: 40
                }
            });
        },

        // Content
        browseContent: function( content ) {
            var state = this.state();

            this.$el.removeClass('hide-toolbar');

            // Browse our library of attachments.
            content.view = new media.view.AttachmentsBrowser({
                controller: this,
                collection: state.get('library'),
                selection:  state.get('selection'),
                model:      state,
                sortable:   state.get('sortable'),
                search:     state.get('searchable'),
                filters:    state.get('filterable'),
                display:    state.get('displaySettings'),
                dragInfo:   state.get('dragInfo'),

                AttachmentView: state.get('AttachmentView')
            });
        },

        uploadContent: function() {
            this.$el.removeClass('hide-toolbar');
            this.content.set( new media.view.UploaderInline({
                controller: this
            }) );
        },

        // Toolbars
        createSelectToolbar: function( toolbar, options ) {
            options = options || this.options.button || {};
            options.controller = this;

            toolbar.view = new media.view.Toolbar.Select( options );
        }
    });

    /**
     * wp.media.view.MediaFrame.Post
     */
    media.view.MediaFrame.Post = media.view.MediaFrame.Select.extend({
        initialize: function() {
            _.defaults( this.options, {
                multiple:  true,
                editing:   false,
                state:    'insert'
            });

            media.view.MediaFrame.Select.prototype.initialize.apply( this, arguments );
            this.createIframeStates();
        },

        createStates: function() {
            var options = this.options;

            // Add the default states.
            this.states.add([
                // Main states.
                new media.controller.Library({
                    id:         'insert',
                    title:      l10n.insertMediaTitle,
                    priority:   20,
                    toolbar:    'main-insert',
                    filterable: 'all',
                    library:    media.query( options.library ),
                    multiple:   options.multiple ? 'reset' : false,
                    editable:   true,

                    // If the user isn't allowed to edit fields,
                    // can they still edit it locally?
                    allowLocalEdits: true,

                    // Show the attachment display settings.
                    displaySettings: true,
                    // Update user settings when users adjust the
                    // attachment display settings.
                    displayUserSettings: true
                }),

                new media.controller.Library({
                    id:         'gallery',
                    title:      l10n.createGalleryTitle,
                    priority:   40,
                    toolbar:    'main-gallery',
                    filterable: 'uploaded',
                    multiple:   'add',
                    editable:   false,

                    library:  media.query( _.defaults({
                        type: 'image'
                    }, options.library ) )
                }),

                // Embed states.
                new media.controller.Embed(),

                // Gallery states.
                new media.controller.GalleryEdit({
                    library: options.selection,
                    editing: options.editing,
                    menu:    'gallery'
                }),

                new media.controller.GalleryAdd()
            ]);


            if ( media.view.settings.post.featuredImageId ) {
                this.states.add( new media.controller.FeaturedImage() );
            }
        },

        bindHandlers: function() {
            media.view.MediaFrame.Select.prototype.bindHandlers.apply( this, arguments );
            this.on( 'menu:create:gallery', this.createMenu, this );
            this.on( 'toolbar:create:main-insert', this.createToolbar, this );
            this.on( 'toolbar:create:main-gallery', this.createToolbar, this );
            this.on( 'toolbar:create:featured-image', this.featuredImageToolbar, this );
            this.on( 'toolbar:create:main-embed', this.mainEmbedToolbar, this );

            var handlers = {
                    menu: {
                        'default': 'mainMenu',
                        'gallery': 'galleryMenu'
                    },

                    content: {
                        'embed':          'embedContent',
                        'edit-selection': 'editSelectionContent'
                    },

                    toolbar: {
                        'main-insert':      'mainInsertToolbar',
                        'main-gallery':     'mainGalleryToolbar',
                        'gallery-edit':     'galleryEditToolbar',
                        'gallery-add':      'galleryAddToolbar'
                    }
                };

            _.each( handlers, function( regionHandlers, region ) {
                _.each( regionHandlers, function( callback, handler ) {
                    this.on( region + ':render:' + handler, this[ callback ], this );
                }, this );
            }, this );
        },

        // Menus
        mainMenu: function( view ) {
            view.set({
                'library-separator': new media.View({
                    className: 'separator',
                    priority: 100
                })
            });
        },

        galleryMenu: function( view ) {
            var lastState = this.lastState(),
                previous = lastState && lastState.id,
                frame = this;

            view.set({
                cancel: {
                    text:     l10n.cancelGalleryTitle,
                    priority: 20,
                    click:    function() {
                        if ( previous )
                            frame.setState( previous );
                        else
                            frame.close();
                    }
                },
                separateCancel: new media.View({
                    className: 'separator',
                    priority: 40
                })
            });
        },

        // Content
        embedContent: function() {
            var view = new media.view.Embed({
                controller: this,
                model:      this.state()
            }).render();

            this.content.set( view );
            view.url.focus();
        },

        editSelectionContent: function() {
            var state = this.state(),
                selection = state.get('selection'),
                view;

            view = new media.view.AttachmentsBrowser({
                controller: this,
                collection: selection,
                selection:  selection,
                model:      state,
                sortable:   true,
                search:     false,
                dragInfo:   true,

                AttachmentView: media.view.Attachment.EditSelection
            }).render();

            view.toolbar.set( 'backToLibrary', {
                text:     l10n.returnToLibrary,
                priority: -100,

                click: function() {
                    this.controller.content.mode('browse');
                }
            });

            // Browse our library of attachments.
            this.content.set( view );
        },

        // Toolbars
        selectionStatusToolbar: function( view ) {
            var editable = this.state().get('editable');

            view.set( 'selection', new media.view.Selection({
                controller: this,
                collection: this.state().get('selection'),
                priority:   -40,

                // If the selection is editable, pass the callback to
                // switch the content mode.
                editable: editable && function() {
                    this.controller.content.mode('edit-selection');
                }
            }).render() );
        },

        mainInsertToolbar: function( view ) {
            var controller = this;

            this.selectionStatusToolbar( view );

            view.set( 'insert', {
                style:    'primary',
                priority: 80,
                text:     l10n.insertIntoPost,
                requires: { selection: true },

                click: function() {
                    var state = controller.state(),
                        selection = state.get('selection');

                    controller.close();
                    state.trigger( 'insert', selection ).reset();
                }
            });
        },

        mainGalleryToolbar: function( view ) {
            var controller = this;

            this.selectionStatusToolbar( view );

            view.set( 'gallery', {
                style:    'primary',
                text:     l10n.createNewGallery,
                priority: 60,
                requires: { selection: true },

                click: function() {
                    var selection = controller.state().get('selection'),
                        edit = controller.state('gallery-edit'),
                        models = selection.where({ type: 'image' });

                    edit.set( 'library', new media.model.Selection( models, {
                        props:    selection.props.toJSON(),
                        multiple: true
                    }) );

                    this.controller.setState('gallery-edit');
                }
            });
        },

        featuredImageToolbar: function( toolbar ) {
            this.createSelectToolbar( toolbar, {
                text:  l10n.setFeaturedImage,
                state: this.options.state
            });
        },

        mainEmbedToolbar: function( toolbar ) {
            toolbar.view = new media.view.Toolbar.Embed({
                controller: this
            });
        },

        galleryEditToolbar: function() {
            var editing = this.state().get('editing');
            this.toolbar.set( new media.view.Toolbar({
                controller: this,
                items: {
                    insert: {
                        style:    'primary',
                        text:     editing ? l10n.updateGallery : l10n.insertGallery,
                        priority: 80,
                        requires: { library: true },

                        click: function() {
                            var controller = this.controller,
                                state = controller.state();

                            controller.close();
                            state.trigger( 'update', state.get('library') );

                            // Restore and reset the default state.
                            controller.setState( controller.options.state );
                            controller.reset();
                        }
                    }
                }
            }) );
        },

        galleryAddToolbar: function() {
            this.toolbar.set( new media.view.Toolbar({
                controller: this,
                items: {
                    insert: {
                        style:    'primary',
                        text:     l10n.addToGallery,
                        priority: 80,
                        requires: { selection: true },

                        click: function() {
                            var controller = this.controller,
                                state = controller.state(),
                                edit = controller.state('gallery-edit');

                            edit.get('library').add( state.get('selection').models );
                            state.trigger('reset');
                            controller.setState('gallery-edit');
                        }
                    }
                }
            }) );
        }
    });

    /**
     * wp.media.view.Modal
     */
    media.view.Modal = media.View.extend({
        tagName:  'div',
        template: media.template('media-modal'),

        attributes: {
            tabindex: 0
        },

        events: {
            'click .media-modal-backdrop, .media-modal-close': 'escapeHandler',
            'keydown': 'keydown'
        },

        initialize: function() {
            _.defaults( this.options, {
                container: document.body,
                title:     '',
                propagate: true,
                freeze:    true
            });
        },

        prepare: function() {
            return {
                title: this.options.title
            };
        },

        attach: function() {
            if ( this.views.attached )
                return this;

            if ( ! this.views.rendered )
                this.render();

            this.$el.appendTo( this.options.container );

            // Manually mark the view as attached and trigger ready.
            this.views.attached = true;
            this.views.ready();

            return this.propagate('attach');
        },

        detach: function() {
            if ( this.$el.is(':visible') )
                this.close();

            this.$el.detach();
            this.views.attached = false;
            return this.propagate('detach');
        },

        open: function() {
            var $el = this.$el,
                options = this.options;

            if ( $el.is(':visible') )
                return this;

            if ( ! this.views.attached )
                this.attach();

            // If the `freeze` option is set, record the window's scroll position.
            if ( options.freeze ) {
                this._freeze = {
                    scrollTop: $( window ).scrollTop()
                };
            }

            $el.show().focus();
            return this.propagate('open');
        },

        close: function( options ) {
            var freeze = this._freeze;

            if ( ! this.views.attached || ! this.$el.is(':visible') )
                return this;

            this.$el.hide();
            this.propagate('close');

            // If the `freeze` option is set, restore the container's scroll position.
            if ( freeze ) {
                $( window ).scrollTop( freeze.scrollTop );
            }

            if ( options && options.escape )
                this.propagate('escape');

            return this;
        },

        escape: function() {
            return this.close({ escape: true });
        },

        escapeHandler: function( event ) {
            event.preventDefault();
            this.escape();
        },

        content: function( content ) {
            this.views.set( '.media-modal-content', content );
            return this;
        },

        // Triggers a modal event and if the `propagate` option is set,
        // forwards events to the modal's controller.
        propagate: function( id ) {
            this.trigger( id );

            if ( this.options.propagate )
                this.controller.trigger( id );

            return this;
        },

        keydown: function( event ) {
            // Close the modal when escape is pressed.
            if ( 27 === event.which ) {
                event.preventDefault();
                this.escape();
                return;
            }
        }
    });

    // wp.media.view.FocusManager
    // ----------------------------
    media.view.FocusManager = media.View.extend({
        events: {
            keydown: 'recordTab',
            focusin: 'updateIndex'
        },

        focus: function() {
            if ( _.isUndefined( this.index ) )
                return;

            // Update our collection of `$tabbables`.
            this.$tabbables = this.$(':tabbable');

            // If tab is saved, focus it.
            this.$tabbables.eq( this.index ).focus();
        },

        recordTab: function( event ) {
            // Look for the tab key.
            if ( 9 !== event.keyCode )
                return;

            // First try to update the index.
            if ( _.isUndefined( this.index ) )
                this.updateIndex( event );

            // If we still don't have an index, bail.
            if ( _.isUndefined( this.index ) )
                return;

            var index = this.index + ( event.shiftKey ? -1 : 1 );

            if ( index >= 0 && index < this.$tabbables.length )
                this.index = index;
            else
                delete this.index;
        },

        updateIndex: function( event ) {
            this.$tabbables = this.$(':tabbable');

            var index = this.$tabbables.index( event.target );

            if ( -1 === index )
                delete this.index;
            else
                this.index = index;
        }
    });

    // wp.media.view.UploaderWindow
    // ----------------------------
    media.view.UploaderWindow = media.View.extend({
        tagName:   'div',
        className: 'uploader-window',
        template:  media.template('uploader-window'),

        initialize: function() {
            var uploader;

            this.$browser = $('<a href="#" class="browser" />').hide().appendTo('body');

            uploader = this.options.uploader = _.defaults( this.options.uploader || {}, {
                dropzone:  this.$el,
                browser:   this.$browser,
                params:    {}
            });

            // Ensure the dropzone is a jQuery collection.
            if ( uploader.dropzone && ! (uploader.dropzone instanceof $) )
                uploader.dropzone = $( uploader.dropzone );

            this.controller.on( 'activate', this.refresh, this );
        },

        refresh: function() {
            if ( this.uploader )
                this.uploader.refresh();
        },

        ready: function() {
            var postId = media.view.settings.post.id,
                dropzone;

            // If the uploader already exists, bail.
            if ( this.uploader )
                return;

            if ( postId )
                this.options.uploader.params.post_id = postId;

            this.uploader = new wp.Uploader( this.options.uploader );

            dropzone = this.uploader.dropzone;
            dropzone.on( 'dropzone:enter', _.bind( this.show, this ) );
            dropzone.on( 'dropzone:leave', _.bind( this.hide, this ) );
        },

        show: function() {
            var $el = this.$el.show();

            // Ensure that the animation is triggered by waiting until
            // the transparent element is painted into the DOM.
            _.defer( function() {
                $el.css({ opacity: 1 });
            });
        },

        hide: function() {
            var $el = this.$el.css({ opacity: 0 });

            media.transition( $el ).done( function() {
                // Transition end events are subject to race conditions.
                // Make sure that the value is set as intended.
                if ( '0' === $el.css('opacity') )
                    $el.hide();
            });
        }
    });

    media.view.UploaderInline = media.View.extend({
        tagName:   'div',
        className: 'uploader-inline',
        template:  media.template('uploader-inline'),

        initialize: function() {
            _.defaults( this.options, {
                message: '',
                status:  true
            });

            if ( ! this.options.$browser && this.controller.uploader )
                this.options.$browser = this.controller.uploader.$browser;

            if ( _.isUndefined( this.options.postId ) )
                this.options.postId = media.view.settings.post.id;

            if ( this.options.status ) {
                this.views.set( '.upload-inline-status', new media.view.UploaderStatus({
                    controller: this.controller
                }) );
            }
        },

        dispose: function() {
            if ( this.disposing )
                return media.View.prototype.dispose.apply( this, arguments );

            // Run remove on `dispose`, so we can be sure to refresh the
            // uploader with a view-less DOM. Track whether we're disposing
            // so we don't trigger an infinite loop.
            this.disposing = true;
            return this.remove();
        },

        remove: function() {
            var result = media.View.prototype.remove.apply( this, arguments );

            _.defer( _.bind( this.refresh, this ) );
            return result;
        },

        refresh: function() {
            var uploader = this.controller.uploader;

            if ( uploader )
                uploader.refresh();
        },

        ready: function() {
            var $browser = this.options.$browser,
                $placeholder;

            if ( this.controller.uploader ) {
                $placeholder = this.$('.browser');

                // Check if we've already replaced the placeholder.
                if ( $placeholder[0] === $browser[0] )
                    return;

                $browser.detach().text( $placeholder.text() );
                $browser[0].className = $placeholder[0].className;
                $placeholder.replaceWith( $browser.show() );
            }

            this.refresh();
            return this;
        }
    });

    /**
     * wp.media.view.UploaderStatus
     */
    media.view.UploaderStatus = media.View.extend({
        className: 'media-uploader-status',
        template:  media.template('uploader-status'),

        events: {
            'click .upload-dismiss-errors': 'dismiss'
        },

        initialize: function() {
            this.queue = wp.Uploader.queue;
            this.queue.on( 'add remove reset', this.visibility, this );
            this.queue.on( 'add remove reset change:percent', this.progress, this );
            this.queue.on( 'add remove reset change:uploading', this.info, this );

            this.errors = wp.Uploader.errors;
            this.errors.reset();
            this.errors.on( 'add remove reset', this.visibility, this );
            this.errors.on( 'add', this.error, this );
        },

        dispose: function() {
            wp.Uploader.queue.off( null, null, this );
            media.View.prototype.dispose.apply( this, arguments );
            return this;
        },

        visibility: function() {
            this.$el.toggleClass( 'uploading', !! this.queue.length );
            this.$el.toggleClass( 'errors', !! this.errors.length );
            this.$el.toggle( !! this.queue.length || !! this.errors.length );
        },

        ready: function() {
            _.each({
                '$bar':      '.media-progress-bar div',
                '$index':    '.upload-index',
                '$total':    '.upload-total',
                '$filename': '.upload-filename'
            }, function( selector, key ) {
                this[ key ] = this.$( selector );
            }, this );

            this.visibility();
            this.progress();
            this.info();
        },

        progress: function() {
            var queue = this.queue,
                $bar = this.$bar;

            if ( ! $bar || ! queue.length )
                return;

            $bar.width( ( queue.reduce( function( memo, attachment ) {
                if ( ! attachment.get('uploading') )
                    return memo + 100;

                var percent = attachment.get('percent');
                return memo + ( _.isNumber( percent ) ? percent : 100 );
            }, 0 ) / queue.length ) + '%' );
        },

        info: function() {
            var queue = this.queue,
                index = 0, active;

            if ( ! queue.length )
                return;

            active = this.queue.find( function( attachment, i ) {
                index = i;
                return attachment.get('uploading');
            });

            this.$index.text( index + 1 );
            this.$total.text( queue.length );
            this.$filename.html( active ? this.filename( active.get('filename') ) : '' );
        },

        filename: function( filename ) {
            return media.truncate( _.escape( filename ), 24 );
        },

        error: function( error ) {
            this.views.add( '.upload-errors', new media.view.UploaderStatusError({
                filename: this.filename( error.get('file').name ),
                message:  error.get('message')
            }), { at: 0 });
        },

        dismiss: function( event ) {
            var errors = this.views.get('.upload-errors');

            event.preventDefault();

            if ( errors )
                _.invoke( errors, 'remove' );
            wp.Uploader.errors.reset();
        }
    });

    media.view.UploaderStatusError = media.View.extend({
        className: 'upload-error',
        template:  media.template('uploader-status-error')
    });

    /**
     * wp.media.view.Toolbar
     */
    media.view.Toolbar = media.View.extend({
        tagName:   'div',
        className: 'media-toolbar',

        initialize: function() {
            var state = this.controller.state(),
                selection = this.selection = state.get('selection'),
                library = this.library = state.get('library');

            this._views = {};

            // The toolbar is composed of two `PriorityList` views.
            this.primary   = new media.view.PriorityList();
            this.secondary = new media.view.PriorityList();
            this.primary.$el.addClass('media-toolbar-primary');
            this.secondary.$el.addClass('media-toolbar-secondary');

            this.views.set([ this.secondary, this.primary ]);

            if ( this.options.items )
                this.set( this.options.items, { silent: true });

            if ( ! this.options.silent )
                this.render();

            if ( selection )
                selection.on( 'add remove reset', this.refresh, this );
            if ( library )
                library.on( 'add remove reset', this.refresh, this );
        },

        dispose: function() {
            if ( this.selection )
                this.selection.off( null, null, this );
            if ( this.library )
                this.library.off( null, null, this );
            return media.View.prototype.dispose.apply( this, arguments );
        },

        ready: function() {
            this.refresh();
        },

        set: function( id, view, options ) {
            var list;
            options = options || {};

            // Accept an object with an `id` : `view` mapping.
            if ( _.isObject( id ) ) {
                _.each( id, function( view, id ) {
                    this.set( id, view, { silent: true });
                }, this );

            } else {
                if ( ! ( view instanceof Backbone.View ) ) {
                    view.classes = [ 'media-button-' + id ].concat( view.classes || [] );
                    view = new media.view.Button( view ).render();
                }

                view.controller = view.controller || this.controller;

                this._views[ id ] = view;

                list = view.options.priority < 0 ? 'secondary' : 'primary';
                this[ list ].set( id, view, options );
            }

            if ( ! options.silent )
                this.refresh();

            return this;
        },

        get: function( id ) {
            return this._views[ id ];
        },

        unset: function( id, options ) {
            delete this._views[ id ];
            this.primary.unset( id, options );
            this.secondary.unset( id, options );

            if ( ! options || ! options.silent )
                this.refresh();
            return this;
        },

        refresh: function() {
            var state = this.controller.state(),
                library = state.get('library'),
                selection = state.get('selection');

            _.each( this._views, function( button ) {
                if ( ! button.model || ! button.options || ! button.options.requires )
                    return;

                var requires = button.options.requires,
                    disabled = false;

                // Prevent insertion of attachments if any of them are still uploading
                disabled = _.some( selection.models, function( attachment ) {
                    return attachment.get('uploading') === true;
                });

                if ( requires.selection && selection && ! selection.length )
                    disabled = true;
                else if ( requires.library && library && ! library.length )
                    disabled = true;

                button.model.set( 'disabled', disabled );
            });
        }
    });

    // wp.media.view.Toolbar.Select
    // ----------------------------
    media.view.Toolbar.Select = media.view.Toolbar.extend({
        initialize: function() {
            var options = this.options;

            _.bindAll( this, 'clickSelect' );

            _.defaults( options, {
                event: 'select',
                state: false,
                reset: true,
                close: true,
                text:  l10n.select,

                // Does the button rely on the selection?
                requires: {
                    selection: true
                }
            });

            options.items = _.defaults( options.items || {}, {
                select: {
                    style:    'primary',
                    text:     options.text,
                    priority: 80,
                    click:    this.clickSelect,
                    requires: options.requires
                }
            });

            media.view.Toolbar.prototype.initialize.apply( this, arguments );
        },

        clickSelect: function() {
            var options = this.options,
                controller = this.controller;

            if ( options.close )
                controller.close();

            if ( options.event )
                controller.state().trigger( options.event );

            if ( options.state )
                controller.setState( options.state );

            if ( options.reset )
                controller.reset();
        }
    });

    // wp.media.view.Toolbar.Embed
    // ---------------------------
    media.view.Toolbar.Embed = media.view.Toolbar.Select.extend({
        initialize: function() {
            _.defaults( this.options, {
                text: l10n.insertIntoPost,
                requires: false
            });

            media.view.Toolbar.Select.prototype.initialize.apply( this, arguments );
        },

        refresh: function() {
            var url = this.controller.state().props.get('url');
            this.get('select').model.set( 'disabled', ! url || url === 'http://' );

            media.view.Toolbar.Select.prototype.refresh.apply( this, arguments );
        }
    });

    /**
     * wp.media.view.Button
     */
    media.view.Button = media.View.extend({
        tagName:    'a',
        className:  'media-button',
        attributes: { href: '#' },

        events: {
            'click': 'click'
        },

        defaults: {
            text:     '',
            style:    '',
            size:     'large',
            disabled: false
        },

        initialize: function() {
            // Create a model with the provided `defaults`.
            this.model = new Backbone.Model( this.defaults );

            // If any of the `options` have a key from `defaults`, apply its
            // value to the `model` and remove it from the `options object.
            _.each( this.defaults, function( def, key ) {
                var value = this.options[ key ];
                if ( _.isUndefined( value ) )
                    return;

                this.model.set( key, value );
                delete this.options[ key ];
            }, this );

            this.model.on( 'change', this.render, this );
        },

        render: function() {
            var classes = [ 'button', this.className ],
                model = this.model.toJSON();

            if ( model.style )
                classes.push( 'button-' + model.style );

            if ( model.size )
                classes.push( 'button-' + model.size );

            classes = _.uniq( classes.concat( this.options.classes ) );
            this.el.className = classes.join(' ');

            this.$el.attr( 'disabled', model.disabled );
            this.$el.text( this.model.get('text') );

            return this;
        },

        click: function( event ) {
            if ( '#' === this.attributes.href )
                event.preventDefault();

            if ( this.options.click && ! this.model.get('disabled') )
                this.options.click.apply( this, arguments );
        }
    });

    /**
     * wp.media.view.ButtonGroup
     */
    media.view.ButtonGroup = media.View.extend({
        tagName:   'div',
        className: 'button-group button-large media-button-group',

        initialize: function() {
            this.buttons = _.map( this.options.buttons || [], function( button ) {
                if ( button instanceof Backbone.View )
                    return button;
                else
                    return new media.view.Button( button ).render();
            });

            delete this.options.buttons;

            if ( this.options.classes )
                this.$el.addClass( this.options.classes );
        },

        render: function() {
            this.$el.html( $( _.pluck( this.buttons, 'el' ) ).detach() );
            return this;
        }
    });

    /**
     * wp.media.view.PriorityList
     */

    media.view.PriorityList = media.View.extend({
        tagName:   'div',

        initialize: function() {
            this._views = {};

            this.set( _.extend( {}, this._views, this.options.views ), { silent: true });
            delete this.options.views;

            if ( ! this.options.silent )
                this.render();
        },

        set: function( id, view, options ) {
            var priority, views, index;

            options = options || {};

            // Accept an object with an `id` : `view` mapping.
            if ( _.isObject( id ) ) {
                _.each( id, function( view, id ) {
                    this.set( id, view );
                }, this );
                return this;
            }

            if ( ! (view instanceof Backbone.View) )
                view = this.toView( view, id, options );

            view.controller = view.controller || this.controller;

            this.unset( id );

            priority = view.options.priority || 10;
            views = this.views.get() || [];

            _.find( views, function( existing, i ) {
                if ( existing.options.priority > priority ) {
                    index = i;
                    return true;
                }
            });

            this._views[ id ] = view;
            this.views.add( view, {
                at: _.isNumber( index ) ? index : views.length || 0
            });

            return this;
        },

        get: function( id ) {
            return this._views[ id ];
        },

        unset: function( id ) {
            var view = this.get( id );

            if ( view )
                view.remove();

            delete this._views[ id ];
            return this;
        },

        toView: function( options ) {
            return new media.View( options );
        }
    });

    /**
     * wp.media.view.MenuItem
     */
    media.view.MenuItem = media.View.extend({
        tagName:   'a',
        className: 'media-menu-item',

        attributes: {
            href: '#'
        },

        events: {
            'click': '_click'
        },

        _click: function( event ) {
            var clickOverride = this.options.click;

            if ( event )
                event.preventDefault();

            if ( clickOverride )
                clickOverride.call( this );
            else
                this.click();
        },

        click: function() {
            var state = this.options.state;
            if ( state )
                this.controller.setState( state );
        },

        render: function() {
            var options = this.options;

            if ( options.text )
                this.$el.text( options.text );
            else if ( options.html )
                this.$el.html( options.html );

            return this;
        }
    });

    /**
     * wp.media.view.Menu
     */
    media.view.Menu = media.view.PriorityList.extend({
        tagName:   'div',
        className: 'media-menu',
        property:  'state',
        ItemView:  media.view.MenuItem,
        region:    'menu',

        toView: function( options, id ) {
            options = options || {};
            options[ this.property ] = options[ this.property ] || id;
            return new this.ItemView( options ).render();
        },

        ready: function() {
            media.view.PriorityList.prototype.ready.apply( this, arguments );
            this.visibility();
        },

        set: function() {
            media.view.PriorityList.prototype.set.apply( this, arguments );
            this.visibility();
        },

        unset: function() {
            media.view.PriorityList.prototype.unset.apply( this, arguments );
            this.visibility();
        },

        visibility: function() {
            var region = this.region,
                view = this.controller[ region ].get(),
                views = this.views.get(),
                hide = ! views || views.length < 2;

            if ( this === view )
                this.controller.$el.toggleClass( 'hide-' + region, hide );
        },

        select: function( id ) {
            var view = this.get( id );

            if ( ! view )
                return;

            this.deselect();
            view.$el.addClass('active');
        },

        deselect: function() {
            this.$el.children().removeClass('active');
        }
    });

    /**
     * wp.media.view.RouterItem
     */
    media.view.RouterItem = media.view.MenuItem.extend({
        click: function() {
            var contentMode = this.options.contentMode;
            if ( contentMode )
                this.controller.content.mode( contentMode );
        }
    });

    /**
     * wp.media.view.Router
     */
    media.view.Router = media.view.Menu.extend({
        tagName:   'div',
        className: 'media-router',
        property:  'contentMode',
        ItemView:  media.view.RouterItem,
        region:    'router',

        initialize: function() {
            this.controller.on( 'content:render', this.update, this );
            media.view.Menu.prototype.initialize.apply( this, arguments );
        },

        update: function() {
            var mode = this.controller.content.mode();
            if ( mode )
                this.select( mode );
        }
    });


    /**
     * wp.media.view.Sidebar
     */
    media.view.Sidebar = media.view.PriorityList.extend({
        className: 'media-sidebar'
    });

    /**
     * wp.media.view.Attachment
     */
    media.view.Attachment = media.View.extend({
        tagName:   'li',
        className: 'attachment',
        template:  media.template('attachment'),

        events: {
            'click .attachment-preview':      'toggleSelectionHandler',
            'change [data-setting]':          'updateSetting',
            'change [data-setting] input':    'updateSetting',
            'change [data-setting] select':   'updateSetting',
            'change [data-setting] textarea': 'updateSetting',
            'click .close':                   'removeFromLibrary',
            'click .check':                   'removeFromSelection',
            'click a':                        'preventDefault'
        },

        buttons: {},

        initialize: function() {
            var selection = this.options.selection;

            this.model.on( 'change:sizes change:uploading', this.render, this );
            this.model.on( 'change:title', this._syncTitle, this );
            this.model.on( 'change:caption', this._syncCaption, this );
            this.model.on( 'change:percent', this.progress, this );

            // Update the selection.
            this.model.on( 'add', this.select, this );
            this.model.on( 'remove', this.deselect, this );
            if ( selection )
                selection.on( 'reset', this.updateSelect, this );

            // Update the model's details view.
            this.model.on( 'selection:single selection:unsingle', this.details, this );
            this.details( this.model, this.controller.state().get('selection') );
        },

        dispose: function() {
            var selection = this.options.selection;

            // Make sure all settings are saved before removing the view.
            this.updateAll();

            if ( selection )
                selection.off( null, null, this );

            media.View.prototype.dispose.apply( this, arguments );
            return this;
        },

        render: function() {
            var options = _.defaults( this.model.toJSON(), {
                    orientation:   'landscape',
                    uploading:     false,
                    type:          '',
                    subtype:       '',
                    icon:          '',
                    filename:      '',
                    caption:       '',
                    title:         '',
                    dateFormatted: '',
                    width:         '',
                    height:        '',
                    compat:        false,
                    alt:           '',
                    description:   ''
                });

            options.buttons  = this.buttons;
            options.describe = this.controller.state().get('describe');

            if ( 'image' === options.type )
                options.size = this.imageSize();

            options.can = {};
            if ( options.nonces ) {
                options.can.remove = !! options.nonces['delete'];
                options.can.save = !! options.nonces.update;
            }

            if ( this.controller.state().get('allowLocalEdits') )
                options.allowLocalEdits = true;

            this.views.detach();
            this.$el.html( this.template( options ) );

            this.$el.toggleClass( 'uploading', options.uploading );
            if ( options.uploading )
                this.$bar = this.$('.media-progress-bar div');
            else
                delete this.$bar;

            // Check if the model is selected.
            this.updateSelect();

            // Update the save status.
            this.updateSave();

            this.views.render();

            return this;
        },

        progress: function() {
            if ( this.$bar && this.$bar.length )
                this.$bar.width( this.model.get('percent') + '%' );
        },

        toggleSelectionHandler: function( event ) {
            var method;

            if ( event.shiftKey )
                method = 'between';
            else if ( event.ctrlKey || event.metaKey )
                method = 'toggle';

            this.toggleSelection({
                method: method
            });
        },

        toggleSelection: function( options ) {
            var collection = this.collection,
                selection = this.options.selection,
                model = this.model,
                method = options && options.method,
                single, models, singleIndex, modelIndex;

            if ( ! selection )
                return;

            single = selection.single();
            method = _.isUndefined( method ) ? selection.multiple : method;

            // If the `method` is set to `between`, select all models that
            // exist between the current and the selected model.
            if ( 'between' === method && single && selection.multiple ) {
                // If the models are the same, short-circuit.
                if ( single === model )
                    return;

                singleIndex = collection.indexOf( single );
                modelIndex  = collection.indexOf( this.model );

                if ( singleIndex < modelIndex )
                    models = collection.models.slice( singleIndex, modelIndex + 1 );
                else
                    models = collection.models.slice( modelIndex, singleIndex + 1 );

                selection.add( models ).single( model );
                return;

            // If the `method` is set to `toggle`, just flip the selection
            // status, regardless of whether the model is the single model.
            } else if ( 'toggle' === method ) {
                selection[ this.selected() ? 'remove' : 'add' ]( model ).single( model );
                return;
            }

            if ( method !== 'add' )
                method = 'reset';

            if ( this.selected() ) {
                // If the model is the single model, remove it.
                // If it is not the same as the single model,
                // it now becomes the single model.
                selection[ single === model ? 'remove' : 'single' ]( model );
            } else {
                // If the model is not selected, run the `method` on the
                // selection. By default, we `reset` the selection, but the
                // `method` can be set to `add` the model to the selection.
                selection[ method ]( model ).single( model );
            }
        },

        updateSelect: function() {
            this[ this.selected() ? 'select' : 'deselect' ]();
        },

        selected: function() {
            var selection = this.options.selection;
            if ( selection )
                return !! selection.get( this.model.cid );
        },

        select: function( model, collection ) {
            var selection = this.options.selection;

            // Check if a selection exists and if it's the collection provided.
            // If they're not the same collection, bail; we're in another
            // selection's event loop.
            if ( ! selection || ( collection && collection !== selection ) )
                return;

            this.$el.addClass('selected');
        },

        deselect: function( model, collection ) {
            var selection = this.options.selection;

            // Check if a selection exists and if it's the collection provided.
            // If they're not the same collection, bail; we're in another
            // selection's event loop.
            if ( ! selection || ( collection && collection !== selection ) )
                return;

            this.$el.removeClass('selected');
        },

        details: function( model, collection ) {
            var selection = this.options.selection,
                details;

            if ( selection !== collection )
                return;

            details = selection.single();
            this.$el.toggleClass( 'details', details === this.model );
        },

        preventDefault: function( event ) {
            event.preventDefault();
        },

        imageSize: function( size ) {
            var sizes = this.model.get('sizes');

            size = size || 'medium';

            // Use the provided image size if possible.
            if ( sizes && sizes[ size ] ) {
                return _.clone( sizes[ size ] );
            } else {
                return {
                    url:         this.model.get('url'),
                    width:       this.model.get('width'),
                    height:      this.model.get('height'),
                    orientation: this.model.get('orientation')
                };
            }
        },

        updateSetting: function( event ) {
            var $setting = $( event.target ).closest('[data-setting]'),
                setting, value;

            if ( ! $setting.length )
                return;

            setting = $setting.data('setting');
            value   = event.target.value;

            if ( this.model.get( setting ) !== value )
                this.save( setting, value );
        },

        // Pass all the arguments to the model's save method.
        //
        // Records the aggregate status of all save requests and updates the
        // view's classes accordingly.
        save: function() {
            var view = this,
                save = this._save = this._save || { status: 'ready' },
                request = this.model.save.apply( this.model, arguments ),
                requests = save.requests ? $.when( request, save.requests ) : request;

            // If we're waiting to remove 'Saved.', stop.
            if ( save.savedTimer )
                clearTimeout( save.savedTimer );

            this.updateSave('waiting');
            save.requests = requests;
            requests.always( function() {
                // If we've performed another request since this one, bail.
                if ( save.requests !== requests )
                    return;

                view.updateSave( requests.state() === 'resolved' ? 'complete' : 'error' );
                save.savedTimer = setTimeout( function() {
                    view.updateSave('ready');
                    delete save.savedTimer;
                }, 2000 );
            });

        },

        updateSave: function( status ) {
            var save = this._save = this._save || { status: 'ready' };

            if ( status && status !== save.status ) {
                this.$el.removeClass( 'save-' + save.status );
                save.status = status;
            }

            this.$el.addClass( 'save-' + save.status );
            return this;
        },

        updateAll: function() {
            var $settings = this.$('[data-setting]'),
                model = this.model,
                changed;

            changed = _.chain( $settings ).map( function( el ) {
                var $input = $('input, textarea, select, [value]', el ),
                    setting, value;

                if ( ! $input.length )
                    return;

                setting = $(el).data('setting');
                value = $input.val();

                // Record the value if it changed.
                if ( model.get( setting ) !== value )
                    return [ setting, value ];
            }).compact().object().value();

            if ( ! _.isEmpty( changed ) )
                model.save( changed );
        },

        removeFromLibrary: function( event ) {
            // Stop propagation so the model isn't selected.
            event.stopPropagation();

            this.collection.remove( this.model );
        },

        removeFromSelection: function( event ) {
            var selection = this.options.selection;
            if ( ! selection )
                return;

            // Stop propagation so the model isn't selected.
            event.stopPropagation();

            selection.remove( this.model );
        }
    });

    // Ensure settings remain in sync between attachment views.
    _.each({
        caption: '_syncCaption',
        title:   '_syncTitle'
    }, function( method, setting ) {
        media.view.Attachment.prototype[ method ] = function( model, value ) {
            var $setting = this.$('[data-setting="' + setting + '"]');

            if ( ! $setting.length )
                return this;

            // If the updated value is in sync with the value in the DOM, there
            // is no need to re-render. If we're currently editing the value,
            // it will automatically be in sync, suppressing the re-render for
            // the view we're editing, while updating any others.
            if ( value === $setting.find('input, textarea, select, [value]').val() )
                return this;

            return this.render();
        };
    });

    /**
     * wp.media.view.Attachment.Library
     */
    media.view.Attachment.Library = media.view.Attachment.extend({
        buttons: {
            check: true
        }
    });

    /**
     * wp.media.view.Attachment.EditLibrary
     */
    media.view.Attachment.EditLibrary = media.view.Attachment.extend({
        buttons: {
            close: true
        }
    });

    /**
     * wp.media.view.Attachments
     */
    media.view.Attachments = media.View.extend({
        tagName:   'ul',
        className: 'attachments',

        cssTemplate: media.template('attachments-css'),

        events: {
            'scroll': 'scroll'
        },

        initialize: function() {
            this.el.id = _.uniqueId('__attachments-view-');

            _.defaults( this.options, {
                refreshSensitivity: 200,
                refreshThreshold:   3,
                AttachmentView:     media.view.Attachment,
                sortable:           false,
                resize:             true
            });

            this._viewsByCid = {};

            this.collection.on( 'add', function( attachment ) {
                this.views.add( this.createAttachmentView( attachment ), {
                    at: this.collection.indexOf( attachment )
                });
            }, this );

            this.collection.on( 'remove', function( attachment ) {
                var view = this._viewsByCid[ attachment.cid ];
                delete this._viewsByCid[ attachment.cid ];

                if ( view )
                    view.remove();
            }, this );

            this.collection.on( 'reset', this.render, this );

            // Throttle the scroll handler.
            this.scroll = _.chain( this.scroll ).bind( this ).throttle( this.options.refreshSensitivity ).value();

            this.initSortable();

            _.bindAll( this, 'css' );
            this.model.on( 'change:edge change:gutter', this.css, this );
            this._resizeCss = _.debounce( _.bind( this.css, this ), this.refreshSensitivity );
            if ( this.options.resize )
                $(window).on( 'resize.attachments', this._resizeCss );
            this.css();
        },

        dispose: function() {
            this.collection.props.off( null, null, this );
            $(window).off( 'resize.attachments', this._resizeCss );
            media.View.prototype.dispose.apply( this, arguments );
        },

        css: function() {
            var $css = $( '#' + this.el.id + '-css' );

            if ( $css.length )
                $css.remove();

            media.view.Attachments.$head().append( this.cssTemplate({
                id:     this.el.id,
                edge:   this.edge(),
                gutter: this.model.get('gutter')
            }) );
        },

        edge: function() {
            var edge = this.model.get('edge'),
                gutter, width, columns;

            if ( ! this.$el.is(':visible') )
                return edge;

            gutter  = this.model.get('gutter') * 2;
            width   = this.$el.width() - gutter;
            columns = Math.ceil( width / ( edge + gutter ) );
            edge = Math.floor( ( width - ( columns * gutter ) ) / columns );
            return edge;
        },

        initSortable: function() {
            var collection = this.collection;

            if ( ! this.options.sortable || ! $.fn.sortable )
                return;

            this.$el.sortable( _.extend({
                // If the `collection` has a `comparator`, disable sorting.
                disabled: !! collection.comparator,

                // Prevent attachments from being dragged outside the bounding
                // box of the list.
                containment: this.$el,

                // Change the position of the attachment as soon as the
                // mouse pointer overlaps a thumbnail.
                tolerance: 'pointer',

                // Record the initial `index` of the dragged model.
                start: function( event, ui ) {
                    ui.item.data('sortableIndexStart', ui.item.index());
                },

                // Update the model's index in the collection.
                // Do so silently, as the view is already accurate.
                update: function( event, ui ) {
                    var model = collection.at( ui.item.data('sortableIndexStart') ),
                        comparator = collection.comparator;

                    // Temporarily disable the comparator to prevent `add`
                    // from re-sorting.
                    delete collection.comparator;

                    // Silently shift the model to its new index.
                    collection.remove( model, {
                        silent: true
                    }).add( model, {
                        silent: true,
                        at:     ui.item.index()
                    });

                    // Restore the comparator.
                    collection.comparator = comparator;

                    // Fire the `reset` event to ensure other collections sync.
                    collection.trigger( 'reset', collection );

                    // If the collection is sorted by menu order,
                    // update the menu order.
                    collection.saveMenuOrder();
                }
            }, this.options.sortable ) );

            // If the `orderby` property is changed on the `collection`,
            // check to see if we have a `comparator`. If so, disable sorting.
            collection.props.on( 'change:orderby', function() {
                this.$el.sortable( 'option', 'disabled', !! collection.comparator );
            }, this );

            this.collection.props.on( 'change:orderby', this.refreshSortable, this );
            this.refreshSortable();
        },

        refreshSortable: function() {
            if ( ! this.options.sortable || ! $.fn.sortable )
                return;

            // If the `collection` has a `comparator`, disable sorting.
            var collection = this.collection,
                orderby = collection.props.get('orderby'),
                enabled = 'menuOrder' === orderby || ! collection.comparator;

            this.$el.sortable( 'option', 'disabled', ! enabled );
        },

        createAttachmentView: function( attachment ) {
            var view = new this.options.AttachmentView({
                controller: this.controller,
                model:      attachment,
                collection: this.collection,
                selection:  this.options.selection
            });

            return this._viewsByCid[ attachment.cid ] = view;
        },

        prepare: function() {
            // Create all of the Attachment views, and replace
            // the list in a single DOM operation.
            if ( this.collection.length ) {
                this.views.set( this.collection.map( this.createAttachmentView, this ) );

            // If there are no elements, clear the views and load some.
            } else {
                this.views.unset();
                this.collection.more().done( this.scroll );
            }
        },

        ready: function() {
            // Trigger the scroll event to check if we're within the
            // threshold to query for additional attachments.
            this.scroll();
        },

        scroll: function() {
            // @todo: is this still necessary?
            if ( ! this.$el.is(':visible') )
                return;

            if ( this.collection.hasMore() && this.el.scrollHeight < this.el.scrollTop + ( this.el.clientHeight * this.options.refreshThreshold ) ) {
                this.collection.more().done( this.scroll );
            }
        }
    }, {
        $head: (function() {
            var $head;
            return function() {
                return $head = $head || $('head');
            };
        }())
    });

    /**
     * wp.media.view.Search
     */
    media.view.Search = media.View.extend({
        tagName:   'input',
        className: 'search',

        attributes: {
            type:        'search',
            placeholder: l10n.search
        },

        events: {
            'input':  'search',
            'keyup':  'search',
            'change': 'search',
            'search': 'search'
        },

        render: function() {
            this.el.value = this.model.escape('search');
            return this;
        },

        search: function( event ) {
            if ( event.target.value )
                this.model.set( 'search', event.target.value );
            else
                this.model.unset('search');
        }
    });

    /**
     * wp.media.view.AttachmentFilters
     */
    media.view.AttachmentFilters = media.View.extend({
        tagName:   'select',
        className: 'attachment-filters',

        events: {
            change: 'change'
        },

        keys: [],

        initialize: function() {
            this.createFilters();
            _.extend( this.filters, this.options.filters );

            // Build `<option>` elements.
            this.$el.html( _.chain( this.filters ).map( function( filter, value ) {
                return {
                    el: $('<option></option>').val(value).text(filter.text)[0],
                    priority: filter.priority || 50
                };
            }, this ).sortBy('priority').pluck('el').value() );

            this.model.on( 'change', this.select, this );
            this.select();
        },

        createFilters: function() {
            this.filters = {};
        },

        change: function() {
            var filter = this.filters[ this.el.value ];

            if ( filter )
                this.model.set( filter.props );
        },

        select: function() {
            var model = this.model,
                value = 'all',
                props = model.toJSON();

            _.find( this.filters, function( filter, id ) {
                var equal = _.all( filter.props, function( prop, key ) {
                    return prop === ( _.isUndefined( props[ key ] ) ? null : props[ key ] );
                });

                if ( equal )
                    return value = id;
            });

            this.$el.val( value );
        }
    });

    media.view.AttachmentFilters.Uploaded = media.view.AttachmentFilters.extend({
        createFilters: function() {
            var type = this.model.get('type'),
                types = media.view.settings.mimeTypes,
                text;

            if ( types && type )
                text = types[ type ];

            this.filters = {
                all: {
                    text:  text || l10n.allMediaItems,
                    props: {
                        uploadedTo: null,
                        orderby: 'date',
                        order:   'DESC'
                    },
                    priority: 10
                },

                uploaded: {
                    text:  l10n.uploadedToThisPost,
                    props: {
                        uploadedTo: media.view.settings.post.id,
                        orderby: 'menuOrder',
                        order:   'ASC'
                    },
                    priority: 20
                }
            };
        }
    });

    media.view.AttachmentFilters.All = media.view.AttachmentFilters.extend({
        createFilters: function() {
            var filters = {};

            _.each( media.view.settings.mimeTypes || {}, function( text, key ) {
                filters[ key ] = {
                    text: text,
                    props: {
                        type:    key,
                        uploadedTo: null,
                        orderby: 'date',
                        order:   'DESC'
                    }
                };
            });

            filters.all = {
                text:  l10n.allMediaItems,
                props: {
                    type:    null,
                    uploadedTo: null,
                    orderby: 'date',
                    order:   'DESC'
                },
                priority: 10
            };

            filters.uploaded = {
                text:  l10n.uploadedToThisPost,
                props: {
                    type:    null,
                    uploadedTo: media.view.settings.post.id,
                    orderby: 'menuOrder',
                    order:   'ASC'
                },
                priority: 20
            };

            this.filters = filters;
        }
    });



    /**
     * wp.media.view.AttachmentsBrowser
     */
    media.view.AttachmentsBrowser = media.View.extend({
        tagName:   'div',
        className: 'attachments-browser',

        initialize: function() {
            _.defaults( this.options, {
                filters: false,
                search:  true,
                display: false,

                AttachmentView: media.view.Attachment.Library
            });

            this.createToolbar();
            this.updateContent();
            this.createSidebar();

            this.collection.on( 'add remove reset', this.updateContent, this );
        },

        dispose: function() {
            this.options.selection.off( null, null, this );
            media.View.prototype.dispose.apply( this, arguments );
            return this;
        },

        createToolbar: function() {
            var filters, FiltersConstructor;

            this.toolbar = new media.view.Toolbar({
                controller: this.controller
            });

            this.views.add( this.toolbar );

            filters = this.options.filters;
            if ( 'uploaded' === filters )
                FiltersConstructor = media.view.AttachmentFilters.Uploaded;
            else if ( 'all' === filters )
                FiltersConstructor = media.view.AttachmentFilters.All;

            if ( FiltersConstructor ) {
                this.toolbar.set( 'filters', new FiltersConstructor({
                    controller: this.controller,
                    model:      this.collection.props,
                    priority:   -80
                }).render() );
            }

            if ( this.options.search ) {
                this.toolbar.set( 'search', new media.view.Search({
                    controller: this.controller,
                    model:      this.collection.props,
                    priority:   60
                }).render() );
            }

            if ( this.options.dragInfo ) {
                this.toolbar.set( 'dragInfo', new media.View({
                    el: $( '<div class="instructions">' + l10n.dragInfo + '</div>' )[0],
                    priority: -40
                }) );
            }
        },

        updateContent: function() {
            var view = this;

            if( ! this.attachments )
                this.createAttachments();

            if ( ! this.collection.length ) {
                this.collection.more().done( function() {
                    if ( ! view.collection.length )
                        view.createUploader();
                });
            }
        },

        removeContent: function() {
            _.each(['attachments','uploader'], function( key ) {
                if ( this[ key ] ) {
                    this[ key ].remove();
                    delete this[ key ];
                }
            }, this );
        },

        createUploader: function() {
            this.removeContent();

            this.uploader = new media.view.UploaderInline({
                controller: this.controller,
                status:     false,
                message:    l10n.noItemsFound
            });

            this.views.add( this.uploader );
        },

        createAttachments: function() {
            this.removeContent();

            this.attachments = new media.view.Attachments({
                controller: this.controller,
                collection: this.collection,
                selection:  this.options.selection,
                model:      this.model,
                sortable:   this.options.sortable,

                // The single `Attachment` view to be used in the `Attachments` view.
                AttachmentView: this.options.AttachmentView
            });

            this.views.add( this.attachments );
        },

        createSidebar: function() {
            var options = this.options,
                selection = options.selection,
                sidebar = this.sidebar = new media.view.Sidebar({
                    controller: this.controller
                });

            this.views.add( sidebar );

            if ( this.controller.uploader ) {
                sidebar.set( 'uploads', new media.view.UploaderStatus({
                    controller: this.controller,
                    priority:   40
                }) );
            }

            selection.on( 'selection:single', this.createSingle, this );
            selection.on( 'selection:unsingle', this.disposeSingle, this );

            if ( selection.single() )
                this.createSingle();
        },

        createSingle: function() {
            var sidebar = this.sidebar,
                single = this.options.selection.single();

            sidebar.set( 'details', new media.view.Attachment.Details({
                controller: this.controller,
                model:      single,
                priority:   80
            }) );

            sidebar.set( 'compat', new media.view.AttachmentCompat({
                controller: this.controller,
                model:      single,
                priority:   120
            }) );

            if ( this.options.display ) {
                sidebar.set( 'display', new media.view.Settings.AttachmentDisplay({
                    controller:   this.controller,
                    model:        this.model.display( single ),
                    attachment:   single,
                    priority:     160,
                    userSettings: this.model.get('displayUserSettings')
                }) );
            }
        },

        disposeSingle: function() {
            var sidebar = this.sidebar;
            sidebar.unset('details');
            sidebar.unset('compat');
            sidebar.unset('display');
        }
    });

    /**
     * wp.media.view.Selection
     */
    media.view.Selection = media.View.extend({
        tagName:   'div',
        className: 'media-selection',
        template:  media.template('media-selection'),

        events: {
            'click .edit-selection':  'edit',
            'click .clear-selection': 'clear'
        },

        initialize: function() {
            _.defaults( this.options, {
                editable:  false,
                clearable: true
            });

            this.attachments = new media.view.Attachments.Selection({
                controller: this.controller,
                collection: this.collection,
                selection:  this.collection,
                model:      new Backbone.Model({
                    edge:   40,
                    gutter: 5
                })
            });

            this.views.set( '.selection-view', this.attachments );
            this.collection.on( 'add remove reset', this.refresh, this );
            this.controller.on( 'content:activate', this.refresh, this );
        },

        ready: function() {
            this.refresh();
        },

        refresh: function() {
            // If the selection hasn't been rendered, bail.
            if ( ! this.$el.children().length )
                return;

            var collection = this.collection,
                editing = 'edit-selection' === this.controller.content.mode();

            // If nothing is selected, display nothing.
            this.$el.toggleClass( 'empty', ! collection.length );
            this.$el.toggleClass( 'one', 1 === collection.length );
            this.$el.toggleClass( 'editing', editing );

            this.$('.count').text( l10n.selected.replace('%d', collection.length) );
        },

        edit: function( event ) {
            event.preventDefault();
            if ( this.options.editable )
                this.options.editable.call( this, this.collection );
        },

        clear: function( event ) {
            event.preventDefault();
            this.collection.reset();
        }
    });


    /**
     * wp.media.view.Attachment.Selection
     */
    media.view.Attachment.Selection = media.view.Attachment.extend({
        className: 'attachment selection',

        // On click, just select the model, instead of removing the model from
        // the selection.
        toggleSelection: function() {
            this.options.selection.single( this.model );
        }
    });

    /**
     * wp.media.view.Attachments.Selection
     */
    media.view.Attachments.Selection = media.view.Attachments.extend({
        events: {},
        initialize: function() {
            _.defaults( this.options, {
                sortable:   true,
                resize:     false,

                // The single `Attachment` view to be used in the `Attachments` view.
                AttachmentView: media.view.Attachment.Selection
            });
            return media.view.Attachments.prototype.initialize.apply( this, arguments );
        }
    });

    /**
     * wp.media.view.Attachments.EditSelection
     */
    media.view.Attachment.EditSelection = media.view.Attachment.Selection.extend({
        buttons: {
            close: true
        }
    });


    /**
     * wp.media.view.Settings
     */
    media.view.Settings = media.View.extend({
        events: {
            'click button':    'updateHandler',
            'change input':    'updateHandler',
            'change select':   'updateHandler',
            'change textarea': 'updateHandler'
        },

        initialize: function() {
            this.model = this.model || new Backbone.Model();
            this.model.on( 'change', this.updateChanges, this );
        },

        prepare: function() {
            return _.defaults({
                model: this.model.toJSON()
            }, this.options );
        },

        render: function() {
            media.View.prototype.render.apply( this, arguments );
            // Select the correct values.
            _( this.model.attributes ).chain().keys().each( this.update, this );
            return this;
        },

        update: function( key ) {
            var value = this.model.get( key ),
                $setting = this.$('[data-setting="' + key + '"]'),
                $buttons, $value;

            // Bail if we didn't find a matching setting.
            if ( ! $setting.length )
                return;

            // Attempt to determine how the setting is rendered and update
            // the selected value.

            // Handle dropdowns.
            if ( $setting.is('select') ) {
                $value = $setting.find('[value="' + value + '"]');

                if ( $value.length ) {
                    $setting.find('option').prop( 'selected', false );
                    $value.prop( 'selected', true );
                } else {
                    // If we can't find the desired value, record what *is* selected.
                    this.model.set( key, $setting.find(':selected').val() );
                }


            // Handle button groups.
            } else if ( $setting.hasClass('button-group') ) {
                $buttons = $setting.find('button').removeClass('active');
                $buttons.filter( '[value="' + value + '"]' ).addClass('active');

            // Handle text inputs and textareas.
            } else if ( $setting.is('input[type="text"], textarea') ) {
                if ( ! $setting.is(':focus') )
                    $setting.val( value );

            // Handle checkboxes.
            } else if ( $setting.is('input[type="checkbox"]') ) {
                $setting.attr( 'checked', !! value );
            }
        },

        updateHandler: function( event ) {
            var $setting = $( event.target ).closest('[data-setting]'),
                value = event.target.value,
                userSetting;

            event.preventDefault();

            if ( ! $setting.length )
                return;

            // Use the correct value for checkboxes.
            if ( $setting.is('input[type="checkbox"]') )
                value = $setting[0].checked;

            // Update the corresponding setting.
            this.model.set( $setting.data('setting'), value );

            // If the setting has a corresponding user setting,
            // update that as well.
            if ( userSetting = $setting.data('userSetting') )
                setUserSetting( userSetting, value );
        },

        updateChanges: function( model ) {
            if ( model.hasChanged() )
                _( model.changed ).chain().keys().each( this.update, this );
        }
    });

    /**
     * wp.media.view.Settings.AttachmentDisplay
     */
    media.view.Settings.AttachmentDisplay = media.view.Settings.extend({
        className: 'attachment-display-settings',
        template:  media.template('attachment-display-settings'),

        initialize: function() {
            var attachment = this.options.attachment;

            _.defaults( this.options, {
                userSettings: false
            });

            media.view.Settings.prototype.initialize.apply( this, arguments );
            this.model.on( 'change:link', this.updateLinkTo, this );

            if ( attachment )
                attachment.on( 'change:uploading', this.render, this );
        },

        dispose: function() {
            var attachment = this.options.attachment;
            if ( attachment )
                attachment.off( null, null, this );

            media.view.Settings.prototype.dispose.apply( this, arguments );
        },

        render: function() {
            var attachment = this.options.attachment;
            if ( attachment ) {
                _.extend( this.options, {
                    sizes: attachment.get('sizes'),
                    type:  attachment.get('type')
                });
            }

            media.view.Settings.prototype.render.call( this );
            this.updateLinkTo();
            return this;
        },

        updateLinkTo: function() {
            var linkTo = this.model.get('link'),
                $input = this.$('.link-to-custom'),
                attachment = this.options.attachment;

            if ( 'none' === linkTo || 'embed' === linkTo || ( ! attachment && 'custom' !== linkTo ) ) {
                $input.hide();
                return;
            }

            if ( attachment ) {
                if ( 'post' === linkTo ) {
                    $input.val( attachment.get('link') );
                } else if ( 'file' === linkTo ) {
                    $input.val( attachment.get('url') );
                } else if ( ! this.model.get('linkUrl') ) {
                    $input.val('http://');
                }

                $input.prop( 'readonly', 'custom' !== linkTo );
            }

            $input.show();

            // If the input is visible, focus and select its contents.
            if ( $input.is(':visible') )
                $input.focus()[0].select();
        }
    });

    /**
     * wp.media.view.Settings.Gallery
     */
    media.view.Settings.Gallery = media.view.Settings.extend({
        className: 'gallery-settings',
        template:  media.template('gallery-settings')
    });

    /**
     * wp.media.view.Attachment.Details
     */
    media.view.Attachment.Details = media.view.Attachment.extend({
        tagName:   'div',
        className: 'attachment-details',
        template:  media.template('attachment-details'),

        events: {
            'change [data-setting]':          'updateSetting',
            'change [data-setting] input':    'updateSetting',
            'change [data-setting] select':   'updateSetting',
            'change [data-setting] textarea': 'updateSetting',
            'click .delete-attachment':       'deleteAttachment',
            'click .edit-attachment':         'editAttachment',
            'click .refresh-attachment':      'refreshAttachment'
        },

        initialize: function() {
            this.focusManager = new media.view.FocusManager({
                el: this.el
            });

            media.view.Attachment.prototype.initialize.apply( this, arguments );
        },

        render: function() {
            media.view.Attachment.prototype.render.apply( this, arguments );
            this.focusManager.focus();
            return this;
        },

        deleteAttachment: function( event ) {
            event.preventDefault();

            if ( confirm( l10n.warnDelete ) )
                this.model.destroy();
        },

        editAttachment: function() {
            this.$el.addClass('needs-refresh');
        },

        refreshAttachment: function( event ) {
            this.$el.removeClass('needs-refresh');
            event.preventDefault();
            this.model.fetch();
        }
    });

    /**
     * wp.media.view.AttachmentCompat
     */
    media.view.AttachmentCompat = media.View.extend({
        tagName:   'form',
        className: 'compat-item',

        events: {
            'submit':          'preventDefault',
            'change input':    'save',
            'change select':   'save',
            'change textarea': 'save'
        },

        initialize: function() {
            this.focusManager = new media.view.FocusManager({
                el: this.el
            });

            this.model.on( 'change:compat', this.render, this );
        },

        dispose: function() {
            if ( this.$(':focus').length )
                this.save();

            return media.View.prototype.dispose.apply( this, arguments );
        },

        render: function() {
            var compat = this.model.get('compat');
            if ( ! compat || ! compat.item )
                return;

            this.views.detach();
            this.$el.html( compat.item );
            this.views.render();

            this.focusManager.focus();
            return this;
        },

        preventDefault: function( event ) {
            event.preventDefault();
        },

        save: function( event ) {
            var data = {};

            if ( event )
                event.preventDefault();

            _.each( this.$el.serializeArray(), function( pair ) {
                data[ pair.name ] = pair.value;
            });

            this.model.saveCompat( data );
        }
    });

    /**
     * wp.media.view.Iframe
     */
    media.view.Iframe = media.View.extend({
        className: 'media-iframe',

        render: function() {
            this.views.detach();
            this.$el.html( '<iframe src="' + this.controller.state().get('src') + '" />' );
            this.views.render();
            return this;
        }
    });

    /**
     * wp.media.view.Embed
     */
    media.view.Embed = media.View.extend({
        className: 'media-embed',

        initialize: function() {
            this.url = new media.view.EmbedUrl({
                controller: this.controller,
                model:      this.model.props
            }).render();

            this.views.set([ this.url ]);
            this.refresh();
            this.model.on( 'change:type', this.refresh, this );
            this.model.on( 'change:loading', this.loading, this );
        },

        settings: function( view ) {
            if ( this._settings )
                this._settings.remove();
            this._settings = view;
            this.views.add( view );
        },

        refresh: function() {
            var type = this.model.get('type'),
                constructor;

            if ( 'image' === type )
                constructor = media.view.EmbedImage;
            else if ( 'link' === type )
                constructor = media.view.EmbedLink;
            else
                return;

            this.settings( new constructor({
                controller: this.controller,
                model:      this.model.props,
                priority:   40
            }) );
        },

        loading: function() {
            this.$el.toggleClass( 'embed-loading', this.model.get('loading') );
        }
    });

    /**
     * wp.media.view.EmbedUrl
     */
    media.view.EmbedUrl = media.View.extend({
        tagName:   'label',
        className: 'embed-url',

        events: {
            'input':  'url',
            'keyup':  'url',
            'change': 'url'
        },

        initialize: function() {
            this.$input = $('<input/>').attr( 'type', 'text' ).val( this.model.get('url') );
            this.input = this.$input[0];

            this.spinner = $('<span class="spinner" />')[0];
            this.$el.append([ this.input, this.spinner ]);

            this.model.on( 'change:url', this.render, this );
        },

        render: function() {
            var $input = this.$input;

            if ( $input.is(':focus') )
                return;

            this.input.value = this.model.get('url') || 'http://';
            media.View.prototype.render.apply( this, arguments );
            return this;
        },

        ready: function() {
            this.focus();
        },

        url: function( event ) {
            this.model.set( 'url', event.target.value );
        },

        focus: function() {
            var $input = this.$input;
            // If the input is visible, focus and select its contents.
            if ( $input.is(':visible') )
                $input.focus()[0].select();
        }
    });

    /**
     * wp.media.view.EmbedLink
     */
    media.view.EmbedLink = media.view.Settings.extend({
        className: 'embed-link-settings',
        template:  media.template('embed-link-settings')
    });

    /**
     * wp.media.view.EmbedImage
     */
    media.view.EmbedImage =  media.view.Settings.AttachmentDisplay.extend({
        className: 'embed-image-settings',
        template:  media.template('embed-image-settings'),

        initialize: function() {
            media.view.Settings.AttachmentDisplay.prototype.initialize.apply( this, arguments );
            this.model.on( 'change:url', this.updateImage, this );
        },

        updateImage: function() {
            this.$('img').attr( 'src', this.model.get('url') );
        }
    });
}(jQuery));