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(function($) {
$.fn.extend({
droppable: function(options) {
var args = Array.prototype.slice.call(arguments, 1);
return this.each(function() {
if (typeof options == "string") {
var drop = $.data(this, "ui-droppable");
drop[options].apply(drop, args);
} else if(!$.data(this, "ui-droppable"))
new $.ui.droppable(this, options);
});
}
});
$.ui.droppable = function(element, options) {
//Initialize needed constants
this.element = $(element);
$.data(element, "ui-droppable", this);
this.element.addClass("ui-droppable");
//Prepare the passed options
this.options = $.extend({}, options);
var o = this.options; var accept = o.accept;
$.extend(o, {
accept: o.accept && o.accept.constructor == Function ? o.accept : function(d) {
return $(d).is(accept);
},
tolerance: o.tolerance || 'intersect'
});
$(element).bind("setData.draggable", function(event, key, value){
o[key] = value;
}).bind("getData.draggable", function(event, key){
return o[key];
});
//Store the droppable's proportions
this.proportions = { width: this.element.outerWidth(), height: this.element.outerHeight() };
// Add the reference and positions to the manager
$.ui.ddmanager.droppables.push({ item: this, over: 0, out: 1 });
};
$.extend($.ui.droppable.prototype, {
plugins: {},
ui: function(c) {
return {
instance: this,
draggable: c.element,
helper: c.helper,
position: c.position,
absolutePosition: c.positionAbs,
options: this.options
};
},
destroy: function() {
var drop = $.ui.ddmanager.droppables;
for ( var i = 0; i < drop.length; i++ )
if ( drop[i].item == this )
drop.splice(i, 1);
this.element
.removeClass("ui-droppable ui-droppable-disabled")
.removeData("ui-droppable")
.unbind(".droppable");
},
enable: function() {
this.element.removeClass("ui-droppable-disabled");
this.disabled = false;
},
disable: function() {
this.element.addClass("ui-droppable-disabled");
this.disabled = true;
},
over: function(e) {
var draggable = $.ui.ddmanager.current;
if (!draggable || draggable.element[0] == this.element[0]) return; // Bail if draggable and droppable are same element
if (this.options.accept.call(this.element,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.element[0] == this.element[0]) return; // Bail if draggable and droppable are same element
if (this.options.accept.call(this.element,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) {
var draggable = $.ui.ddmanager.current;
if (!draggable || draggable.element[0] == this.element[0]) return; // Bail if draggable and droppable are same element
if(this.options.accept.call(this.element,draggable.element)) {
$.ui.plugin.call(this, 'drop', [e, this.ui(draggable)]);
this.element.triggerHandler("drop", [e, this.ui(draggable)], this.options.drop);
}
},
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);
}
});
$.ui.intersect = function(draggable, droppable, toleranceMode) {
if (!droppable.offset) return false;
var x1 = draggable.positionAbs.left, x2 = x1 + draggable.helperProportions.width,
y1 = draggable.positionAbs.top, y2 = y1 + draggable.helperProportions.height;
var l = droppable.offset.left, r = l + droppable.item.proportions.width,
t = droppable.offset.top, b = t + droppable.item.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.left + draggable.clickOffset.left) && (draggable.positionAbs.left + draggable.clickOffset.left) < r
&& t < (draggable.positionAbs.top + draggable.clickOffset.top) && (draggable.positionAbs.top + draggable.clickOffset.top) < b);
break;
case 'touch':
return ( (l < x1 && x1 < r && t < y1 && y1 < b) // Top-Left Corner
|| (l < x1 && x1 < r && t < y2 && y2 < b) // Bottom-Left Corner
|| (l < x2 && x2 < r && t < y1 && y1 < b) // Top-Right Corner
|| (l < x2 && x2 < r && t < y2 && y2 < b) ); // Bottom-Right Corner
break;
default:
return false;
break;
}
};
/*
This manager tracks offsets of draggables and droppables
*/
$.ui.ddmanager = {
current: null,
droppables: [],
prepareOffsets: function(t, e) {
var m = $.ui.ddmanager.droppables;
for (var i = 0; i < m.length; i++) {
if(m[i].item.disabled || (t && !m[i].item.options.accept.call(m[i].item.element,t.element))) continue;
m[i].offset = $(m[i].item.element).offset();
if(t) m[i].item.activate.call(m[i].item, e); //Activate the droppable if used directly from draggables
}
},
drop: function(draggable, e) {
$.each($.ui.ddmanager.droppables, function() {
if (!this.item.disabled && $.ui.intersect(draggable, this, this.item.options.tolerance))
this.item.drop.call(this.item, e);
if (!this.item.disabled && this.item.options.accept.call(this.item.element,draggable.element)) {
this.out = 1; this.over = 0;
this.item.deactivate.call(this.item, e);
}
});
},
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();
//Run through all draggables and check their positions based on specific tolerance options
$.each($.ui.ddmanager.droppables, function() {
if(this.item.disabled) return false;
var intersects = $.ui.intersect(draggable, this, this.item.options.tolerance);
var c = !intersects && this.over == 1 ? 'out' : (intersects && this.over == 0 ? 'over' : null);
if(!c) return;
this[c] = 1; this[c == 'out' ? 'over' : 'out'] = 0;
this.item[c].call(this.item, e);
});
}
};
})(jQuery);
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