/*
 * jQuery UI Droppable
 *
 * Copyright (c) 2008 Paul Bakaus
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 * 
 * http://docs.jquery.com/UI/Droppables
 *
 * Depends:
 *	ui.core.js
 *	ui.draggable.js
 */
(function($) {
$.widget("ui.droppable", {
init: function() {
var o = this.options, accept = o.accept;
this.isover = 0; this.isout = 1;
this.options.accept = this.options.accept && this.options.accept.constructor == Function ? this.options.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[this.options.scope] = $.ui.ddmanager.droppables[this.options.scope] || [];
$.ui.ddmanager.droppables[this.options.scope].push(this);
(this.options.cssNamespace && this.element.addClass(this.options.cssNamespace+"-droppable"));
},
plugins: {},
ui: function(c) {
return {
draggable: (c.currentItem || c.element),
helper: c.helper,
position: c.position,
absolutePosition: c.positionAbs,
options: this.options,
element: this.element
};
},
destroy: function() {
var drop = $.ui.ddmanager.droppables[this.options.scope];
for ( var i = 0; i < drop.length; i++ )
if ( drop[i] == this )
drop.splice(i, 1);
this.element
.removeClass("ui-droppable-disabled")
.removeData("droppable")
.unbind(".droppable");
},
over: function(e) {
var draggable = $.ui.ddmanager.current;
if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0]) return; // Bail if draggable and droppable are same element
if (this.options.accept.call(this.element,(draggable.currentItem || draggable.element))) {
$.ui.plugin.call(this, 'over', [e, this.ui(draggable)]);
this.element.triggerHandler("dropover", [e, this.ui(draggable)], this.options.over);
}
},
out: function(e) {
var draggable = $.ui.ddmanager.current;
if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0]) return; // Bail if draggable and droppable are same element
if (this.options.accept.call(this.element,(draggable.currentItem || draggable.element))) {
$.ui.plugin.call(this, 'out', [e, this.ui(draggable)]);
this.element.triggerHandler("dropout", [e, this.ui(draggable)], this.options.out);
}
},
drop: function(e,custom) {
var draggable = custom || $.ui.ddmanager.current;
if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0]) return false; // Bail if draggable and droppable are same element
var childrenIntersection = false;
this.element.find(":data(droppable)").not(".ui-draggable-dragging").each(function() {
var inst = $.data(this, 'droppable');
if(inst.options.greedy && $.ui.intersect(draggable, $.extend(inst, { offset: inst.element.offset() }), inst.options.tolerance)) {
childrenIntersection = true; return false;
}
});
if(childrenIntersection) return false;
if(this.options.accept.call(this.element,(draggable.currentItem || draggable.element))) {
$.ui.plugin.call(this, 'drop', [e, this.ui(draggable)]);
this.element.triggerHandler("drop", [e, this.ui(draggable)], this.options.drop);
return true;
}
return false;
},
activate: function(e) {
var draggable = $.ui.ddmanager.current;
$.ui.plugin.call(this, 'activate', [e, this.ui(draggable)]);
if(draggable) this.element.triggerHandler("dropactivate", [e, this.ui(draggable)], this.options.activate);
},
deactivate: function(e) {
var draggable = $.ui.ddmanager.current;
$.ui.plugin.call(this, 'deactivate', [e, this.ui(draggable)]);
if(draggable) this.element.triggerHandler("dropdeactivate", [e, this.ui(draggable)], this.options.deactivate);
}
});
$.extend($.ui.droppable, {
defaults: {
disabled: false,
tolerance: 'intersect',
scope: 'default',
cssNamespace: 'ui'
}
});
$.ui.intersect = function(draggable, droppable, toleranceMode) {
if (!droppable.offset) return false;
var x1 = (draggable.positionAbs || draggable.position.absolute).left, x2 = x1 + draggable.helperProportions.width,
y1 = (draggable.positionAbs || draggable.position.absolute).top, y2 = y1 + draggable.helperProportions.height;
var 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);
break;
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
break;
case 'pointer':
return (l < ((draggable.positionAbs || draggable.position.absolute).left + (draggable.clickOffset || draggable.offset.click).left) && ((draggable.positionAbs || draggable.position.absolute).left + (draggable.clickOffset || draggable.offset.click).left) < r
&& t < ((draggable.positionAbs || draggable.position.absolute).top + (draggable.clickOffset || draggable.offset.click).top) && ((draggable.positionAbs || draggable.position.absolute).top + (draggable.clickOffset || draggable.offset.click).top) < b);
break;
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
);
break;
default:
return false;
break;
}
};
/*
This manager tracks offsets of draggables and droppables
*/
$.ui.ddmanager = {
current: null,
droppables: { 'default': [] },
prepareOffsets: function(t, e) {
var m = $.ui.ddmanager.droppables[t.options.scope];
var type = e ? e.type : null; // workaround for #2317
var list = (t.currentItem || t.element).find(":data(droppable)").andSelf();	
droppablesLoop: for (var i = 0; i < m.length; i++) {
if(m[i].options.disabled || (t && !m[i].options.accept.call(m[i].element,(t.currentItem || t.element)))) continue;	//No disabled and non-accepted
for (var j=0; j < list.length; j++) { if(list[j] == m[i].element[0]) { m[i].proportions.height = 0; continue droppablesLoop; } }; //Filter out elements in the current dragged item
m[i].visible = m[i].element.css("display") != "none"; if(!m[i].visible) continue; 									//If the element is not visible, continue
m[i].offset = m[i].element.offset();
m[i].proportions = { width: m[i].element[0].offsetWidth, height: m[i].element[0].offsetHeight };
if(type == "dragstart" || type == "sortactivate") m[i].activate.call(m[i], e); 										//Activate the droppable if used directly from draggables
}
},
drop: function(draggable, e) {
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, e);
if (!this.options.disabled && this.visible && this.options.accept.call(this.element,(draggable.currentItem || draggable.element))) {
this.isout = 1; this.isover = 0;
this.deactivate.call(this, e);
}
});
return dropped;
},
drag: function(draggable, e) {
//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, e);
//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 intersects = $.ui.intersect(draggable, this, this.options.tolerance);
var c = !intersects && this.isover == 1 ? 'isout' : (intersects && this.isover == 0 ? 'isover' : null);
if(!c) return;
var parentInstance;
if (this.options.greedy) {
var parent = this.element.parents(':data(droppable):eq(0)');
if (parent.length) {
parentInstance = $.data(parent[0], 'droppable');
parentInstance.greedyChild = (c == 'isover' ? 1 : 0);
}
}
// we just moved into a greedy child
if (parentInstance && c == 'isover') {
parentInstance['isover'] = 0;
parentInstance['isout'] = 1;
parentInstance.out.call(parentInstance, e);
}
this[c] = 1; this[c == 'isout' ? 'isover' : 'isout'] = 0;
this[c == "isover" ? "over" : "out"].call(this, e);
// we just moved out of a greedy child
if (parentInstance && c == 'isout') {
parentInstance['isout'] = 0;
parentInstance['isover'] = 1;
parentInstance.over.call(parentInstance, e);
}
});
}
};
/*
 * Droppable Extensions
 */
$.ui.plugin.add("droppable", "activeClass", {
activate: function(e, ui) {
$(this).addClass(ui.options.activeClass);
},
deactivate: function(e, ui) {
$(this).removeClass(ui.options.activeClass);
},
drop: function(e, ui) {
$(this).removeClass(ui.options.activeClass);
}
});
$.ui.plugin.add("droppable", "hoverClass", {
over: function(e, ui) {
$(this).addClass(ui.options.hoverClass);
},
out: function(e, ui) {
$(this).removeClass(ui.options.hoverClass);
},
drop: function(e, ui) {
$(this).removeClass(ui.options.hoverClass);
}
});
})(jQuery);