ucberkeley/moocchat

/*
 * jquery.simulate - simulate browser mouse and keyboard events
 *
 * Copyright (c) 2009 Eduardo Lundgren (eduardolundgren@gmail.com)
 * and Richard D. Worth (rdworth@gmail.com)
 *
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) 
 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
 *
 */

;(function($) {

$.fn.extend({
    simulate: function(type, options) {
        return this.each(function() {
            var opt = $.extend({}, $.simulate.defaults, options || {});
            new $.simulate(this, type, opt);
        });
    }
});

$.simulate = function(el, type, options) {
    this.target = el;
    this.options = options;

    if (/^drag$/.test(type)) {
        this[type].apply(this, [this.target, options]);
    } else {
        this.simulateEvent(el, type, options);
    }
};

$.extend($.simulate.prototype, {
    simulateEvent: function(el, type, options) {
        var evt = this.createEvent(type, options);
        this.dispatchEvent(el, type, evt, options);
        return evt;
    },
    createEvent: function(type, options) {
        if (/^mouse(over|out|down|up|move)|(dbl)?click$/.test(type)) {
            return this.mouseEvent(type, options);
        } else if (/^key(up|down|press)$/.test(type)) {
            return this.keyboardEvent(type, options);
        }
    },
    mouseEvent: function(type, options) {
        var evt;
        var e = $.extend({
            bubbles: true, cancelable: (type != "mousemove"), view: window, detail: 0,
            screenX: 0, screenY: 0, clientX: 0, clientY: 0,
            ctrlKey: false, altKey: false, shiftKey: false, metaKey: false,
            button: 0, relatedTarget: undefined
        }, options);

        var relatedTarget = $(e.relatedTarget)[0];

        if ($.isFunction(document.createEvent)) {
            evt = document.createEvent("MouseEvents");
            evt.initMouseEvent(type, e.bubbles, e.cancelable, e.view, e.detail,
                e.screenX, e.screenY, e.clientX, e.clientY,
                e.ctrlKey, e.altKey, e.shiftKey, e.metaKey,
                e.button, e.relatedTarget || document.body.parentNode);
        } else if (document.createEventObject) {
            evt = document.createEventObject();
            $.extend(evt, e);
            evt.button = { 0:1, 1:4, 2:2 }[evt.button] || evt.button;
        }
        return evt;
    },
    keyboardEvent: function(type, options) {
        var evt;

        var e = $.extend({ bubbles: true, cancelable: true, view: window,
            ctrlKey: false, altKey: false, shiftKey: false, metaKey: false,
            keyCode: 0, charCode: 0
        }, options);

        if ($.isFunction(document.createEvent)) {
            try {
                evt = document.createEvent("KeyEvents");
                evt.initKeyEvent(type, e.bubbles, e.cancelable, e.view,
                    e.ctrlKey, e.altKey, e.shiftKey, e.metaKey,
                    e.keyCode, e.charCode);
            } catch(err) {
                evt = document.createEvent("Events");
                evt.initEvent(type, e.bubbles, e.cancelable);
                $.extend(evt, { view: e.view,
                    ctrlKey: e.ctrlKey, altKey: e.altKey, shiftKey: e.shiftKey, metaKey: e.metaKey,
                    keyCode: e.keyCode, charCode: e.charCode
                });
            }
        } else if (document.createEventObject) {
            evt = document.createEventObject();
            $.extend(evt, e);
        }
        if (($.browser !== undefined) && ($.browser.msie || $.browser.opera)) {
            evt.keyCode = (e.charCode > 0) ? e.charCode : e.keyCode;
            evt.charCode = undefined;
        }
        return evt;
    },

    dispatchEvent: function(el, type, evt) {
        if (el.dispatchEvent) {
            el.dispatchEvent(evt);
        } else if (el.fireEvent) {
            el.fireEvent('on' + type, evt);
        }
        return evt;
    },

    drag: function(el) {
        var self = this, center = this.findCenter(this.target), 
            options = this.options,    x = Math.floor(center.x), y = Math.floor(center.y), 
            dx = options.dx || 0, dy = options.dy || 0, target = this.target;
        var coord = { clientX: x, clientY: y };
        this.simulateEvent(target, "mousedown", coord);
        coord = { clientX: x + 1, clientY: y + 1 };
        this.simulateEvent(document, "mousemove", coord);
        coord = { clientX: x + dx, clientY: y + dy };
        this.simulateEvent(document, "mousemove", coord);
        this.simulateEvent(document, "mousemove", coord);
        this.simulateEvent(target, "mouseup", coord);
    },
    findCenter: function(el) {
        var el = $(this.target), o = el.offset();
        return {
            x: o.left + el.outerWidth() / 2,
            y: o.top + el.outerHeight() / 2
        };
    }
});

$.extend($.simulate, {
    defaults: {
        speed: 'sync'
    },
    VK_TAB: 9,
    VK_ENTER: 13,
    VK_ESC: 27,
    VK_PGUP: 33,
    VK_PGDN: 34,
    VK_END: 35,
    VK_HOME: 36,
    VK_LEFT: 37,
    VK_UP: 38,
    VK_RIGHT: 39,
    VK_DOWN: 40
});

})(jQuery);