source: trunk/themes/default/js/ui/jquery.ui.droppable.js @ 20824

/*!
 * jQuery UI Droppable 1.10.1
 * http://jqueryui.com
 *
 * Copyright 2013 jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://jquery.org/license
 *
 * http://api.jqueryui.com/droppable/
 *
 * Depends:
 *      jquery.ui.core.js
 *      jquery.ui.widget.js
 *      jquery.ui.mouse.js
 *      jquery.ui.draggable.js
 */
(function( $, undefined ) {

function isOverAxis( x, reference, size ) {
        return ( x > reference ) && ( x < ( reference + size ) );
}

$.widget("ui.droppable", {
        version: "1.10.1",
        widgetEventPrefix: "drop",
        options: {
                accept: "*",
                activeClass: false,
                addClasses: true,
                greedy: false,
                hoverClass: false,
                scope: "default",
                tolerance: "intersect",

                // callbacks
                activate: null,
                deactivate: null,
                drop: null,
                out: null,
                over: null
        },
        _create: function() {

                var o = this.options,
                        accept = o.accept;

                this.isover = false;
                this.isout = true;

                this.accept = $.isFunction(accept) ? accept : function(d) {
                        return d.is(accept);
                };

                //Store the droppable's proportions
                this.proportions = { width: this.element[0].offsetWidth, height: this.element[0].offsetHeight };

                // Add the reference and positions to the manager
                $.ui.ddmanager.droppables[o.scope] = $.ui.ddmanager.droppables[o.scope] || [];
                $.ui.ddmanager.droppables[o.scope].push(this);

                (o.addClasses && this.element.addClass("ui-droppable"));

        },

        _destroy: function() {
                var i = 0,
                        drop = $.ui.ddmanager.droppables[this.options.scope];

                for ( ; i < drop.length; i++ ) {
                        if ( drop[i] === this ) {
                                drop.splice(i, 1);
                        }
                }

                this.element.removeClass("ui-droppable ui-droppable-disabled");
        },

        _setOption: function(key, value) {

                if(key === "accept") {
                        this.accept = $.isFunction(value) ? value : function(d) {
                                return d.is(value);
                        };
                }
                $.Widget.prototype._setOption.apply(this, arguments);
        },

        _activate: function(event) {
                var draggable = $.ui.ddmanager.current;
                if(this.options.activeClass) {
                        this.element.addClass(this.options.activeClass);
                }
                if(draggable){
                        this._trigger("activate", event, this.ui(draggable));
                }
        },

        _deactivate: function(event) {
                var draggable = $.ui.ddmanager.current;
                if(this.options.activeClass) {
                        this.element.removeClass(this.options.activeClass);
                }
                if(draggable){
                        this._trigger("deactivate", event, this.ui(draggable));
                }
        },

        _over: function(event) {

                var draggable = $.ui.ddmanager.current;

                // Bail if draggable and droppable are same element
                if (!draggable || (draggable.currentItem || draggable.element)[0] === this.element[0]) {
                        return;
                }

                if (this.accept.call(this.element[0],(draggable.currentItem || draggable.element))) {
                        if(this.options.hoverClass) {
                                this.element.addClass(this.options.hoverClass);
                        }
                        this._trigger("over", event, this.ui(draggable));
                }

        },

        _out: function(event) {

                var draggable = $.ui.ddmanager.current;

                // Bail if draggable and droppable are same element
                if (!draggable || (draggable.currentItem || draggable.element)[0] === this.element[0]) {
                        return;
                }

                if (this.accept.call(this.element[0],(draggable.currentItem || draggable.element))) {
                        if(this.options.hoverClass) {
                                this.element.removeClass(this.options.hoverClass);
                        }
                        this._trigger("out", event, this.ui(draggable));
                }

        },

        _drop: function(event,custom) {

                var draggable = custom || $.ui.ddmanager.current,
                        childrenIntersection = false;

                // Bail if draggable and droppable are same element
                if (!draggable || (draggable.currentItem || draggable.element)[0] === this.element[0]) {
                        return false;
                }

                this.element.find(":data(ui-droppable)").not(".ui-draggable-dragging").each(function() {
                        var inst = $.data(this, "ui-droppable");
                        if(
                                inst.options.greedy &&
                                !inst.options.disabled &&
                                inst.options.scope === draggable.options.scope &&
                                inst.accept.call(inst.element[0], (draggable.currentItem || draggable.element)) &&
                                $.ui.intersect(draggable, $.extend(inst, { offset: inst.element.offset() }), inst.options.tolerance)
                        ) { childrenIntersection = true; return false; }
                });
                if(childrenIntersection) {
                        return false;
                }

                if(this.accept.call(this.element[0],(draggable.currentItem || draggable.element))) {
                        if(this.options.activeClass) {
                                this.element.removeClass(this.options.activeClass);
                        }
                        if(this.options.hoverClass) {
                                this.element.removeClass(this.options.hoverClass);
                        }
                        this._trigger("drop", event, this.ui(draggable));
                        return this.element;
                }

                return false;

        },

        ui: function(c) {
                return {
                        draggable: (c.currentItem || c.element),
                        helper: c.helper,
                        position: c.position,
                        offset: c.positionAbs
                };
        }

});

$.ui.intersect = function(draggable, droppable, toleranceMode) {

        if (!droppable.offset) {
                return false;
        }

        var draggableLeft, draggableTop,
                x1 = (draggable.positionAbs || draggable.position.absolute).left, x2 = x1 + draggable.helperProportions.width,
                y1 = (draggable.positionAbs || draggable.position.absolute).top, y2 = y1 + draggable.helperProportions.height,
                l = droppable.offset.left, r = l + droppable.proportions.width,
                t = droppable.offset.top, b = t + droppable.proportions.height;

        switch (toleranceMode) {
                case "fit":
                        return (l <= x1 && x2 <= r && t <= y1 && y2 <= b);
                case "intersect":
                        return (l < x1 + (draggable.helperProportions.width / 2) && // Right Half
                                x2 - (draggable.helperProportions.width / 2) < r && // Left Half
                                t < y1 + (draggable.helperProportions.height / 2) && // Bottom Half
                                y2 - (draggable.helperProportions.height / 2) < b ); // Top Half
                case "pointer":
                        draggableLeft = ((draggable.positionAbs || draggable.position.absolute).left + (draggable.clickOffset || draggable.offset.click).left);
                        draggableTop = ((draggable.positionAbs || draggable.position.absolute).top + (draggable.clickOffset || draggable.offset.click).top);
                        return isOverAxis( draggableTop, t, droppable.proportions.height ) && isOverAxis( draggableLeft, l, droppable.proportions.width );
                case "touch":
                        return (
                                (y1 >= t && y1 <= b) || // Top edge touching
                                (y2 >= t && y2 <= b) || // Bottom edge touching
                                (y1 < t && y2 > b)              // Surrounded vertically
                        ) && (
                                (x1 >= l && x1 <= r) || // Left edge touching
                                (x2 >= l && x2 <= r) || // Right edge touching
                                (x1 < l && x2 > r)              // Surrounded horizontally
                        );
                default:
                        return false;
                }

};

/*
        This manager tracks offsets of draggables and droppables
*/
$.ui.ddmanager = {
        current: null,
        droppables: { "default": [] },
        prepareOffsets: function(t, event) {

                var i, j,
                        m = $.ui.ddmanager.droppables[t.options.scope] || [],
                        type = event ? event.type : null, // workaround for #2317
                        list = (t.currentItem || t.element).find(":data(ui-droppable)").addBack();

                droppablesLoop: for (i = 0; i < m.length; i++) {

                        //No disabled and non-accepted
                        if(m[i].options.disabled || (t && !m[i].accept.call(m[i].element[0],(t.currentItem || t.element)))) {
                                continue;
                        }

                        // Filter out elements in the current dragged item
                        for (j=0; j < list.length; j++) {
                                if(list[j] === m[i].element[0]) {
                                        m[i].proportions.height = 0;
                                        continue droppablesLoop;
                                }
                        }

                        m[i].visible = m[i].element.css("display") !== "none";
                        if(!m[i].visible) {
                                continue;
                        }

                        //Activate the droppable if used directly from draggables
                        if(type === "mousedown") {
                                m[i]._activate.call(m[i], event);
                        }

                        m[i].offset = m[i].element.offset();
                        m[i].proportions = { width: m[i].element[0].offsetWidth, height: m[i].element[0].offsetHeight };

                }

        },
        drop: function(draggable, event) {

                var dropped = false;
                $.each($.ui.ddmanager.droppables[draggable.options.scope] || [], function() {

                        if(!this.options) {
                                return;
                        }
                        if (!this.options.disabled && this.visible && $.ui.intersect(draggable, this, this.options.tolerance)) {
                                dropped = this._drop.call(this, event) || dropped;
                        }

                        if (!this.options.disabled && this.visible && this.accept.call(this.element[0],(draggable.currentItem || draggable.element))) {
                                this.isout = true;
                                this.isover = false;
                                this._deactivate.call(this, event);
                        }

                });
                return dropped;

        },
        dragStart: function( draggable, event ) {
                //Listen for scrolling so that if the dragging causes scrolling the position of the droppables can be recalculated (see #5003)
                draggable.element.parentsUntil( "body" ).bind( "scroll.droppable", function() {
                        if( !draggable.options.refreshPositions ) {
                                $.ui.ddmanager.prepareOffsets( draggable, event );
                        }
                });
        },
        drag: function(draggable, event) {

                //If you have a highly dynamic page, you might try this option. It renders positions every time you move the mouse.
                if(draggable.options.refreshPositions) {
                        $.ui.ddmanager.prepareOffsets(draggable, event);
                }

                //Run through all droppables and check their positions based on specific tolerance options
                $.each($.ui.ddmanager.droppables[draggable.options.scope] || [], function() {

                        if(this.options.disabled || this.greedyChild || !this.visible) {
                                return;
                        }

                        var parentInstance, scope, parent,
                                intersects = $.ui.intersect(draggable, this, this.options.tolerance),
                                c = !intersects && this.isover ? "isout" : (intersects && !this.isover ? "isover" : null);
                        if(!c) {
                                return;
                        }

                        if (this.options.greedy) {
                                // find droppable parents with same scope
                                scope = this.options.scope;
                                parent = this.element.parents(":data(ui-droppable)").filter(function () {
                                        return $.data(this, "ui-droppable").options.scope === scope;
                                });

                                if (parent.length) {
                                        parentInstance = $.data(parent[0], "ui-droppable");
                                        parentInstance.greedyChild = (c === "isover");
                                }
                        }

                        // we just moved into a greedy child
                        if (parentInstance && c === "isover") {
                                parentInstance.isover = false;
                                parentInstance.isout = true;
                                parentInstance._out.call(parentInstance, event);
                        }

                        this[c] = true;
                        this[c === "isout" ? "isover" : "isout"] = false;
                        this[c === "isover" ? "_over" : "_out"].call(this, event);

                        // we just moved out of a greedy child
                        if (parentInstance && c === "isout") {
                                parentInstance.isout = false;
                                parentInstance.isover = true;
                                parentInstance._over.call(parentInstance, event);
                        }
                });

        },
        dragStop: function( draggable, event ) {
                draggable.element.parentsUntil( "body" ).unbind( "scroll.droppable" );
                //Call prepareOffsets one final time since IE does not fire return scroll events when overflow was caused by drag (see #5003)
                if( !draggable.options.refreshPositions ) {
                        $.ui.ddmanager.prepareOffsets( draggable, event );
                }
        }
};

})(jQuery);