CaffGeek/MBACNationals

/* global wpPointerL10n */
/**
 * Pointer jQuery widget.
 */
(function($){
    var identifier = 0,
        zindex = 9999;

    $.widget('wp.pointer', {
        options: {
            pointerClass: 'wp-pointer',
            pointerWidth: 320,
            content: function() {
                return $(this).text();
            },
            buttons: function( event, t ) {
                var close  = ( wpPointerL10n ) ? wpPointerL10n.dismiss : 'Dismiss',
                    button = $('<a class="close" href="#">' + close + '</a>');

                return button.bind( 'click.pointer', function(e) {
                    e.preventDefault();
                    t.element.pointer('close');
                });
            },
            position: 'top',
            show: function( event, t ) {
                t.pointer.show();
                t.opened();
            },
            hide: function( event, t ) {
                t.pointer.hide();
                t.closed();
            },
            document: document
        },

        _create: function() {
            var positioning,
                family;

            this.content = $('<div class="wp-pointer-content"></div>');
            this.arrow   = $('<div class="wp-pointer-arrow"><div class="wp-pointer-arrow-inner"></div></div>');

            family = this.element.parents().add( this.element );
            positioning = 'absolute';

            if ( family.filter(function(){ return 'fixed' === $(this).css('position'); }).length )
                positioning = 'fixed';

            this.pointer = $('<div />')
                .append( this.content )
                .append( this.arrow )
                .attr('id', 'wp-pointer-' + identifier++)
                .addClass( this.options.pointerClass )
                .css({'position': positioning, 'width': this.options.pointerWidth+'px', 'display': 'none'})
                .appendTo( this.options.document.body );
        },

        _setOption: function( key, value ) {
            var o   = this.options,
                tip = this.pointer;

            // Handle document transfer
            if ( key === 'document' && value !== o.document ) {
                tip.detach().appendTo( value.body );

            // Handle class change
            } else if ( key === 'pointerClass' ) {
                tip.removeClass( o.pointerClass ).addClass( value );
            }

            // Call super method.
            $.Widget.prototype._setOption.apply( this, arguments );

            // Reposition automatically
            if ( key === 'position' ) {
                this.reposition();

            // Update content automatically if pointer is open
            } else if ( key === 'content' && this.active ) {
                this.update();
            }
        },

        destroy: function() {
            this.pointer.remove();
            $.Widget.prototype.destroy.call( this );
        },

        widget: function() {
            return this.pointer;
        },

        update: function( event ) {
            var self = this,
                o    = this.options,
                dfd  = $.Deferred(),
                content;

            if ( o.disabled )
                return;

            dfd.done( function( content ) {
                self._update( event, content );
            });

            // Either o.content is a string...
            if ( typeof o.content === 'string' ) {
                content = o.content;

            // ...or o.content is a callback.
            } else {
                content = o.content.call( this.element[0], dfd.resolve, event, this._handoff() );
            }

            // If content is set, then complete the update.
            if ( content )
                dfd.resolve( content );

            return dfd.promise();
        },

        /**
         * Update is separated into two functions to allow events to defer
         * updating the pointer (e.g. fetch content with ajax, etc).
         */
        _update: function( event, content ) {
            var buttons,
                o = this.options;

            if ( ! content )
                return;

            this.pointer.stop(); // Kill any animations on the pointer.
            this.content.html( content );

            buttons = o.buttons.call( this.element[0], event, this._handoff() );
            if ( buttons ) {
                buttons.wrap('<div class="wp-pointer-buttons" />').parent().appendTo( this.content );
            }

            this.reposition();
        },

        reposition: function() {
            var position;

            if ( this.options.disabled )
                return;

            position = this._processPosition( this.options.position );

            // Reposition pointer.
            this.pointer.css({
                top: 0,
                left: 0,
                zIndex: zindex++ // Increment the z-index so that it shows above other opened pointers.
            }).show().position($.extend({
                of: this.element,
                collision: 'fit none'
            }, position )); // the object comes before this.options.position so the user can override position.of.

            this.repoint();
        },

        repoint: function() {
            var o = this.options,
                edge;

            if ( o.disabled )
                return;

            edge = ( typeof o.position == 'string' ) ? o.position : o.position.edge;

            // Remove arrow classes.
            this.pointer[0].className = this.pointer[0].className.replace( /wp-pointer-[^\s'"]*/, '' );

            // Add arrow class.
            this.pointer.addClass( 'wp-pointer-' + edge );
        },

        _processPosition: function( position ) {
            var opposite = {
                    top: 'bottom',
                    bottom: 'top',
                    left: 'right',
                    right: 'left'
                },
                result;

            // If the position object is a string, it is shorthand for position.edge.
            if ( typeof position == 'string' ) {
                result = {
                    edge: position + ''
                };
            } else {
                result = $.extend( {}, position );
            }

            if ( ! result.edge )
                return result;

            if ( result.edge == 'top' || result.edge == 'bottom' ) {
                result.align = result.align || 'left';

                result.at = result.at || result.align + ' ' + opposite[ result.edge ];
                result.my = result.my || result.align + ' ' + result.edge;
            } else {
                result.align = result.align || 'top';

                result.at = result.at || opposite[ result.edge ] + ' ' + result.align;
                result.my = result.my || result.edge + ' ' + result.align;
            }

            return result;
        },

        open: function( event ) {
            var self = this,
                o    = this.options;

            if ( this.active || o.disabled || this.element.is(':hidden') )
                return;

            this.update().done( function() {
                self._open( event );
            });
        },

        _open: function( event ) {
            var self = this,
                o    = this.options;

            if ( this.active || o.disabled || this.element.is(':hidden') )
                return;

            this.active = true;

            this._trigger( 'open', event, this._handoff() );

            this._trigger( 'show', event, this._handoff({
                opened: function() {
                    self._trigger( 'opened', event, self._handoff() );
                }
            }));
        },

        close: function( event ) {
            if ( !this.active || this.options.disabled )
                return;

            var self = this;
            this.active = false;

            this._trigger( 'close', event, this._handoff() );
            this._trigger( 'hide', event, this._handoff({
                closed: function() {
                    self._trigger( 'closed', event, self._handoff() );
                }
            }));
        },

        sendToTop: function() {
            if ( this.active )
                this.pointer.css( 'z-index', zindex++ );
        },

        toggle: function( event ) {
            if ( this.pointer.is(':hidden') )
                this.open( event );
            else
                this.close( event );
        },

        _handoff: function( extend ) {
            return $.extend({
                pointer: this.pointer,
                element: this.element
            }, extend);
        }
    });
})(jQuery);