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steal('jquery/event/drag','jquery/dom/within','jquery/dom/compare',function($){
var event = $.event;
//somehow need to keep track of elements with selectors on them. When element is removed, somehow we need to know that
//
/**
* @add jQuery.event.special
*/
var eventNames = [
/**
* @attribute dropover
* Called when a drag is first moved over this drop element.
* <p>Drop events are covered in more detail in [jQuery.Drop].</p>
*/
"dropover",
/**
* @attribute dropon
* Called when a drag is dropped on a drop element.
* <p>Drop events are covered in more detail in [jQuery.Drop].</p>
*/
"dropon",
/**
* @attribute dropout
* Called when a drag is moved out of this drop.
* <p>Drop events are covered in more detail in [jQuery.Drop].</p>
*/
"dropout",
/**
* @attribute dropinit
* Called when a drag motion starts and the drop elements are initialized.
* <p>Drop events are covered in more detail in [jQuery.Drop].</p>
*/
"dropinit",
/**
* @attribute dropmove
* Called repeatedly when a drag is moved over a drop.
* <p>Drop events are covered in more detail in [jQuery.Drop].</p>
*/
"dropmove",
/**
* @attribute dropend
* Called when the drag is done for this drop.
* <p>Drop events are covered in more detail in [jQuery.Drop].</p>
*/
"dropend"];
/**
* @class jQuery.Drop
* @parent specialevents
* @plugin jquery/event/drop
* @download http://jmvcsite.heroku.com/pluginify?plugins[]=jquery/event/drop/drop.js
* @test jquery/event/drag/qunit.html
*
* Provides drop events as a special event to jQuery.
* By binding to a drop event, the your callback functions will be
* called during the corresponding phase of drag.
* <h2>Drop Events</h2>
* All drop events are called with the native event, an instance of drop, and the drag. Here are the available drop
* events:
* <ul>
* <li><code>dropinit</code> - the drag motion is started, drop positions are calculated.</li>
* <li><code>dropover</code> - a drag moves over a drop element, called once as the drop is dragged over the element.</li>
* <li><code>dropout</code> - a drag moves out of the drop element.</li>
* <li><code>dropmove</code> - a drag is moved over a drop element, called repeatedly as the element is moved.</li>
* <li><code>dropon</code> - a drag is released over a drop element.</li>
* <li><code>dropend</code> - the drag motion has completed.</li>
* </ul>
* <h2>Examples</h2>
* Here's how to listen for when a drag moves over a drop:
* @codestart
* $('.drop').delegate("dropover", function(ev, drop, drag){
* $(this).addClass("drop-over")
* })
* @codeend
* A bit more complex example:
* @demo jquery/event/drop/drop.html 1000
*
*
*
* ## How it works
*
* 1. When you bind on a drop event, it adds that element to the list of rootElements.
* RootElements might be drop points, or might have delegated drop points in them.
*
* 2. When a drag motion is started, each rootElement is queried for the events listening on it.
* These events might be delegated events so we need to query for the drop elements.
*
* 3. With each drop element, we add a Drop object with all the callbacks for that element.
* Each element might have multiple event provided by different rootElements. We merge
* callbacks into the Drop object if there is an existing Drop object.
*
* 4. Once Drop objects have been added to all elements, we go through them and call draginit
* if available.
*
*
* @constructor
* The constructor is never called directly.
*/
$.Drop = function(callbacks, element){
jQuery.extend(this,callbacks);
this.element = $(element);
}
// add the elements ...
$.each(eventNames, function(){
event.special[this] = {
add: function( handleObj ) {
//add this element to the compiles list
var el = $(this), current = (el.data("dropEventCount") || 0);
el.data("dropEventCount", current+1 )
if(current==0){
$.Drop.addElement(this);
}
},
remove: function() {
var el = $(this), current = (el.data("dropEventCount") || 0);
el.data("dropEventCount", current-1 )
if(current<=1){
$.Drop.removeElement(this);
}
}
}
});
$.extend($.Drop,{
lowerName: "drop",
_rootElements: [], //elements that are listening for drops
_elements: $(), //elements that can be dropped on
last_active: [],
endName: "dropon",
// adds an element as a 'root' element
// this element might have events that we need to respond to
addElement: function( el ) {
//check other elements
for(var i =0; i < this._rootElements.length ; i++ ){
if(el ==this._rootElements[i]) return;
}
this._rootElements.push(el);
},
removeElement: function( el ) {
for(var i =0; i < this._rootElements.length ; i++ ){
if(el == this._rootElements[i]){
this._rootElements.splice(i,1)
return;
}
}
},
/**
* @hide
* For a list of affected drops, sorts them by which is deepest in the DOM first.
*/
sortByDeepestChild: function( a, b ) {
var compare = a.element.compare(b.element);
if(compare & 16 || compare & 4) return 1;
if(compare & 8 || compare & 2) return -1;
return 0;
},
/**
* @hide
* Tests if a drop is within the point.
*/
isAffected: function( point, moveable, responder ) {
return ((responder.element != moveable.element) && (responder.element.within(point[0], point[1], responder._cache).length == 1));
},
/**
* @hide
* Calls dropout and sets last active to null
* @param {Object} drop
* @param {Object} drag
* @param {Object} event
*/
deactivate: function( responder, mover, event ) {
mover.out(event, responder)
responder.callHandlers(this.lowerName+'out',responder.element[0], event, mover)
},
/**
* @hide
* Calls dropover
* @param {Object} drop
* @param {Object} drag
* @param {Object} event
*/
activate: function( responder, mover, event ) { //this is where we should call over
mover.over(event, responder)
//this.last_active = responder;
responder.callHandlers(this.lowerName+'over',responder.element[0], event, mover);
},
move: function( responder, mover, event ) {
responder.callHandlers(this.lowerName+'move',responder.element[0], event, mover)
},
/**
* Gets all elements that are droppable and adds them to a list.
*
* This should be called if and when new drops are added to the page
* during the motion of a single drag.
*
* This is called by default when a drag motion starts.
*
* ## Use
*
* After adding an element or drop, call compile.
*
* $("#midpoint").bind("dropover",function(){
* // when a drop hovers over midpoint,
* // make drop a drop.
* $("#drop").bind("dropover", function(){
*
* });
* $.Drop.compile();
* });
*/
compile: function( event, drag ) {
// if we called compile w/o a current drag
if(!this.dragging && !drag){
return;
}else if(!this.dragging){
this.dragging = drag;
this.last_active = [];
//this._elements = $();
}
var el,
drops,
selector,
dropResponders,
newEls = [],
dragging = this.dragging;
// go to each root element and look for drop elements
for(var i=0; i < this._rootElements.length; i++){ //for each element
el = this._rootElements[i]
// gets something like {"": ["dropinit"], ".foo" : ["dropover","dropmove"] }
var drops = $.event.findBySelector(el, eventNames)
// get drop elements by selector
for(selector in drops){
dropResponders = selector ? jQuery(selector, el) : [el];
// for each drop element
for(var e= 0; e < dropResponders.length; e++){
// add the callbacks to the element's Data
// there already might be data, so we merge it
if( this.addCallbacks(dropResponders[e], drops[selector], dragging) ){
newEls.push(dropResponders[e])
};
}
}
}
// once all callbacks are added, call init on everything ...
// todo ... init could be called more than once?
this.add(newEls, event, dragging)
},
// adds the drag callbacks object to the element or merges other callbacks ...
// returns true or false if the element is new ...
// onlyNew lets only new elements add themselves
addCallbacks : function(el, callbacks, onlyNew){
var origData = $.data(el,"_dropData");
if(!origData){
$.data(el,"_dropData", new $.Drop(callbacks, el));
//this._elements.push(el);
return true;
}else if(!onlyNew){
var origCbs = origData;
// merge data
for(var eventName in callbacks){
origCbs[eventName] = origCbs[eventName] ?
origCbs[eventName].concat(callbacks[eventName]) :
callbacks[eventName];
}
return false;
}
},
// calls init on each element's drags.
// if its cancelled it's removed
// adds to the current elements ...
add: function( newEls, event, drag , dragging) {
var i = 0,
drop;
while(i < newEls.length){
drop = $.data(newEls[i],"_dropData");
drop.callHandlers(this.lowerName+'init', newEls[i], event, drag)
if(drop._canceled){
newEls.splice(i,1)
}else{
i++;
}
}
this._elements.push.apply(this._elements, newEls)
},
show: function( point, moveable, event ) {
var element = moveable.element;
if(!this._elements.length) return;
var respondable,
affected = [],
propagate = true,
i = 0,
j,
la,
toBeActivated,
aff,
oldLastActive = this.last_active,
responders = [],
self = this,
drag;
//what's still affected ... we can also move element out here
while( i < this._elements.length){
drag = $.data(this._elements[i],"_dropData");
if (!drag) {
this._elements.splice(i, 1)
}
else {
i++;
if (self.isAffected(point, moveable, drag)) {
affected.push(drag);
}
}
}
affected.sort(this.sortByDeepestChild); //we should only trigger on lowest children
event.stopRespondPropagate = function(){
propagate = false;
}
toBeActivated = affected.slice();
// all these will be active
this.last_active = affected;
//deactivate everything in last_active that isn't active
for (j = 0; j < oldLastActive.length; j++) {
la = oldLastActive[j];
i = 0;
while((aff = toBeActivated[i])){
if(la == aff){
toBeActivated.splice(i,1);break;
}else{
i++;
}
}
if(!aff){
this.deactivate(la, moveable, event);
}
if(!propagate) return;
}
for(var i =0; i < toBeActivated.length; i++){
this.activate(toBeActivated[i], moveable, event);
if(!propagate) return;
}
//activate everything in affected that isn't in last_active
for (i = 0; i < affected.length; i++) {
this.move(affected[i], moveable, event);
if(!propagate) return;
}
},
end: function( event, moveable ) {
var responder, la,
endName = this.lowerName+'end',
dropData;
// call dropon
//go through the actives ... if you are over one, call dropped on it
for(var i = 0; i < this.last_active.length; i++){
la = this.last_active[i]
if( this.isAffected(event.vector(), moveable, la) && la[this.endName]){
la.callHandlers(this.endName, null, event, moveable);
}
}
// call dropend
for(var r =0; r<this._elements.length; r++){
dropData = $.data(this._elements[r],"_dropData");
dropData && dropData.callHandlers(endName, null, event, moveable);
}
this.clear();
},
/**
* Called after dragging has stopped.
* @hide
*/
clear: function() {
this._elements.each(function(){
$.removeData(this,"_dropData")
})
this._elements = $();
delete this.dragging;
//this._responders = [];
}
})
$.Drag.responder = $.Drop;
$.extend($.Drop.prototype,{
callHandlers: function( method, el, ev, drag ) {
var length = this[method] ? this[method].length : 0
for(var i =0; i < length; i++){
this[method][i].call(el || this.element[0], ev, this, drag)
}
},
/**
* Caches positions of draggable elements. This should be called in dropinit. For example:
* @codestart
* dropinit: function( el, ev, drop ) { drop.cache_position() }
* @codeend
*/
cache: function( value ) {
this._cache = value != null ? value : true;
},
/**
* Prevents this drop from being dropped on.
*/
cancel: function() {
this._canceled = true;
}
} )
});