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(function($) {
$.fn.extend({
draggable: function(options) {
var args = Array.prototype.slice.call(arguments, 1);
return this.each(function() {
if (typeof options == "string") {
var drag = $.data(this, "ui-draggable");
drag[options].apply(drag, args);
} else if(!$.data(this, "ui-draggable"))
new $.ui.draggable(this, options);
});
}
});
$.ui.draggable = function(element, options) {
//Initialize needed constants
var self = this;
this.element = $(element);
$.data(element, "ui-draggable", this);
this.element.addClass("ui-draggable");
//Prepare the passed options
this.options = $.extend({}, options);
var o = this.options;
$.extend(o, {
helper: o.ghosting == true ? 'clone' : (o.helper || 'original'),
handle : o.handle ? ($(o.handle, element)[0] ? $(o.handle, element) : this.element) : this.element,
appendTo: o.appendTo || 'parent'
});
$(element).bind("setData.draggable", function(event, key, value){
self.options[key] = value;
}).bind("getData.draggable", function(event, key){
return self.options[key];
});
//Initialize mouse events for interaction
$(o.handle).mouseInteraction({
executor: this,
delay: o.delay,
distance: o.distance || 0,
dragPrevention: o.prevention ? o.prevention.toLowerCase().split(',') : ['input','textarea','button','select','option'],
start: this.start,
stop: this.stop,
drag: this.drag,
condition: function(e) { return !(e.target.className.indexOf("ui-resizable-handle") != -1 || this.disabled); }
});
//Position the node
if(o.helper == 'original' && (this.element.css('position') == 'static' || this.element.css('position') == ''))
this.element.css('position', 'relative');
};
$.extend($.ui.draggable.prototype, {
plugins: {},
ui: function(e) {
return {
helper: this.helper,
position: this.position,
absolutePosition: this.positionAbs,
instance: this,
options: this.options
};
},
propagate: function(n,e) {
$.ui.plugin.call(this, n, [e, this.ui()]);
return this.element.triggerHandler(n == "drag" ? n : "drag"+n, [e, this.ui()], this.options[n]);
},
destroy: function() {
this.handle.removeMouseInteraction();
this.element
.removeClass("ui-draggable ui-draggable-disabled")
.removeData("ui-draggable")
.unbind(".draggable");
},
enable: function() {
this.element.removeClass("ui-draggable-disabled");
this.disabled = false;
},
disable: function() {
this.element.addClass("ui-draggable-disabled");
this.disabled = true;
},
recallOffset: function(e) {
var elementPosition = { left: this.elementOffset.left - this.offsetParentOffset.left, top: this.elementOffset.top - this.offsetParentOffset.top };
var r = this.helper.css('position') == 'relative';
//Generate the original position
this.originalPosition = {
left: (r ? parseInt(this.helper.css('left'),10) || 0 : elementPosition.left + (this.offsetParent[0] == document.body ? 0 : this.offsetParent[0].scrollLeft)),
top: (r ? parseInt(this.helper.css('top'),10) || 0 : elementPosition.top + (this.offsetParent[0] == document.body ? 0 : this.offsetParent[0].scrollTop))
};
//Generate a flexible offset that will later be subtracted from e.pageX/Y
this.offset = {left: this._pageX - this.originalPosition.left, top: this._pageY - this.originalPosition.top };
},
start: function(e) {
var o = this.options;
if($.ui.ddmanager) $.ui.ddmanager.current = this;
//Create and append the visible helper
this.helper = typeof o.helper == 'function' ? $(o.helper.apply(this.element[0], [e])) : (o.helper == 'clone' ? this.element.clone().appendTo((o.appendTo == 'parent' ? this.element[0].parentNode : o.appendTo)) : this.element);
if(this.helper[0] != this.element[0]) this.helper.css('position', 'absolute');
if(!this.helper.parents('body').length) this.helper.appendTo((o.appendTo == 'parent' ? this.element[0].parentNode : o.appendTo));
//Find out the next positioned parent
this.offsetParent = (function(cp) {
while(cp) {
if(cp.style && (/(absolute|relative|fixed)/).test($.css(cp,'position'))) return $(cp);
cp = cp.parentNode ? cp.parentNode : null;
}; return $("body");
})(this.helper[0].parentNode);
//Prepare variables for position generation
this.elementOffset = this.element.offset();
this.offsetParentOffset = this.offsetParent.offset();
var elementPosition = { left: this.elementOffset.left - this.offsetParentOffset.left, top: this.elementOffset.top - this.offsetParentOffset.top };
this._pageX = e.pageX; this._pageY = e.pageY;
this.clickOffset = { left: e.pageX - this.elementOffset.left, top: e.pageY - this.elementOffset.top };
var r = this.helper.css('position') == 'relative';
//Generate the original position
this.originalPosition = {
left: (r ? parseInt(this.helper.css('left'),10) || 0 : elementPosition.left + (this.offsetParent[0] == document.body ? 0 : this.offsetParent[0].scrollLeft)),
top: (r ? parseInt(this.helper.css('top'),10) || 0 : elementPosition.top + (this.offsetParent[0] == document.body ? 0 : this.offsetParent[0].scrollTop))
};
//If we have a fixed element, we must subtract the scroll offset again
if(this.element.css('position') == 'fixed') {
this.originalPosition.top -= this.offsetParent[0] == document.body ? $(document).scrollTop() : this.offsetParent[0].scrollTop;
this.originalPosition.left -= this.offsetParent[0] == document.body ? $(document).scrollLeft() : this.offsetParent[0].scrollLeft;
}
//Generate a flexible offset that will later be subtracted from e.pageX/Y
this.offset = {left: e.pageX - this.originalPosition.left, top: e.pageY - this.originalPosition.top };
//Call plugins and callbacks
this.propagate("start", e);
this.helperProportions = { width: this.helper.outerWidth(), height: this.helper.outerHeight() };
if ($.ui.ddmanager && !o.dropBehaviour) $.ui.ddmanager.prepareOffsets(this, e);
//If we have something in cursorAt, we'll use it
if(o.cursorAt) {
if(o.cursorAt.top != undefined || o.cursorAt.bottom != undefined) {
this.offset.top -= this.clickOffset.top - (o.cursorAt.top != undefined ? o.cursorAt.top : (this.helperProportions.height - o.cursorAt.bottom));
this.clickOffset.top = (o.cursorAt.top != undefined ? o.cursorAt.top : (this.helperProportions.height - o.cursorAt.bottom));
}
if(o.cursorAt.left != undefined || o.cursorAt.right != undefined) {
this.offset.left -= this.clickOffset.left - (o.cursorAt.left != undefined ? o.cursorAt.left : (this.helperProportions.width - o.cursorAt.right));
this.clickOffset.left = (o.cursorAt.left != undefined ? o.cursorAt.left : (this.helperProportions.width - o.cursorAt.right));
}
}
return false;
},
clear: function() {
if($.ui.ddmanager) $.ui.ddmanager.current = null;
this.helper = null;
},
stop: function(e) {
//If we are using droppables, inform the manager about the drop
if ($.ui.ddmanager && !this.options.dropBehaviour)
$.ui.ddmanager.drop(this, e);
//Call plugins and trigger callbacks
this.propagate("stop", e);
if(this.cancelHelperRemoval) return false;
if(this.options.helper != 'original') this.helper.remove();
this.clear();
return false;
},
drag: function(e) {
//Compute the helpers position
this.position = { top: e.pageY - this.offset.top, left: e.pageX - this.offset.left };
this.positionAbs = { left: e.pageX - this.clickOffset.left, top: e.pageY - this.clickOffset.top };
//Call plugins and callbacks
this.position = this.propagate("drag", e) || this.position;
this.helper.css({ left: this.position.left+'px', top: this.position.top+'px' }); // Stick the helper to the cursor
if($.ui.ddmanager) $.ui.ddmanager.drag(this, e);
return false;
}
});
})(jQuery);
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