forked from 6pac/SlickGrid
/
jquery.event.drag-2.3.0.js
387 lines (363 loc) · 17.4 KB
/
jquery.event.drag-2.3.0.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
/*!
* jquery.event.drag - v 2.3.0
* Copyright (c) 2010 Three Dub Media - http://threedubmedia.com
* Open Source MIT License - http://threedubmedia.com/code/license
*/
// Created: 2008-06-04
// Updated: 2012-05-21
// Updated: 2016-08-16 Luiz Gonzaga dos Santos Filho
// REQUIRES: jquery 1.8 +, , event.drag 2.3.0
// TESTED WITH: jQuery 1.8.3, 1.11.2, 2.2.4, and 3.1.0
;(function( $ ) {
// add the jquery instance method
$.fn.drag = function( str, arg, opts ){
// figure out the event type
var type = typeof str == "string" ? str : "",
// figure out the event handler...
fn = $.isFunction( str ) ? str : $.isFunction( arg ) ? arg : null;
// fix the event type
if ( type.indexOf("drag") !== 0 )
type = "drag"+ type;
// were options passed
opts = ( str == fn ? arg : opts ) || {};
// trigger or bind event handler
return fn ? this.on( type, opts, fn ) : this.trigger( type );
};
// local refs (increase compression)
var $event = $.event,
$special = $event.special,
// configure the drag special event
drag = $special.drag = {
// these are the default settings
defaults: {
which: 1, // mouse button pressed to start drag sequence
distance: 0, // distance dragged before dragstart
not: ':input', // selector to suppress dragging on target elements
handle: null, // selector to match handle target elements
relative: false, // true to use "position", false to use "offset"
drop: true, // false to suppress drop events, true or selector to allow
click: false // false to suppress click events after dragend (no proxy)
},
// the key name for stored drag data
datakey: "dragdata",
// prevent bubbling for better performance
noBubble: true,
// count bound related events
add: function( obj ){
// read the interaction data
var data = $.data( this, drag.datakey ),
// read any passed options
opts = obj.data || {};
// count another realted event
data.related += 1;
// extend data options bound with this event
// don't iterate "opts" in case it is a node
$.each( drag.defaults, function( key, def ){
if ( opts[ key ] !== undefined )
data[ key ] = opts[ key ];
});
},
// forget unbound related events
remove: function(){
$.data( this, drag.datakey ).related -= 1;
},
// configure interaction, capture settings
setup: function(){
// check for related events
if ( $.data( this, drag.datakey ) )
return;
// initialize the drag data with copied defaults
var data = $.extend({ related:0 }, drag.defaults );
// store the interaction data
$.data( this, drag.datakey, data );
// bind the mousedown event, which starts drag interactions
$event.add( this, "touchstart mousedown", drag.init, data );
// prevent image dragging in IE...
if ( this.attachEvent )
this.attachEvent("ondragstart", drag.dontstart );
},
// destroy configured interaction
teardown: function(){
var data = $.data( this, drag.datakey ) || {};
// check for related events
if ( data.related )
return;
// remove the stored data
$.removeData( this, drag.datakey );
// remove the mousedown event
$event.remove( this, "touchstart mousedown", drag.init );
// enable text selection
drag.textselect( true );
// un-prevent image dragging in IE...
if ( this.detachEvent )
this.detachEvent("ondragstart", drag.dontstart );
},
// initialize the interaction
init: function( event ){
// sorry, only one touch at a time
if ( drag.touched )
return;
// the drag/drop interaction data
var dd = event.data, results;
// check the which directive
if ( event.which != 0 && dd.which > 0 && event.which != dd.which )
return;
// check for suppressed selector
if ( $( event.target ).is( dd.not ) )
return;
// check for handle selector
if ( dd.handle && !$( event.target ).closest( dd.handle, event.currentTarget ).length )
return;
drag.touched = event.type == 'touchstart' ? this : null;
dd.propagates = 1;
dd.mousedown = this;
dd.interactions = [ drag.interaction( this, dd ) ];
dd.target = event.target;
dd.pageX = event.pageX;
dd.pageY = event.pageY;
dd.dragging = null;
// handle draginit event...
results = drag.hijack( event, "draginit", dd );
// early cancel
if ( !dd.propagates )
return;
// flatten the result set
results = drag.flatten( results );
// insert new interaction elements
if ( results && results.length ){
dd.interactions = [];
$.each( results, function(){
dd.interactions.push( drag.interaction( this, dd ) );
});
}
// remember how many interactions are propagating
dd.propagates = dd.interactions.length;
// locate and init the drop targets
if ( dd.drop !== false && $special.drop )
$special.drop.handler( event, dd );
// disable text selection
drag.textselect( false );
// bind additional events...
if ( drag.touched )
$event.add( drag.touched, "touchmove touchend", drag.handler, dd );
else
$event.add( document, "mousemove mouseup", drag.handler, dd );
// helps prevent text selection or scrolling
if ( !drag.touched || dd.live )
return false;
},
// returns an interaction object
interaction: function( elem, dd ){
var offset = (elem && elem.ownerDocument)
? $( elem )[ dd.relative ? "position" : "offset" ]() || { top:0, left:0 }
: { top: 0, left: 0 };
return {
drag: elem,
callback: new drag.callback(),
droppable: [],
offset: offset
};
},
// handle drag-releatd DOM events
handler: function( event ){
// read the data before hijacking anything
var dd = event.data;
// handle various events
switch ( event.type ){
// mousemove, check distance, start dragging
case !dd.dragging && 'touchmove':
event.preventDefault();
case !dd.dragging && 'mousemove':
// drag tolerance, x² + y² = distance²
if ( Math.pow( event.pageX-dd.pageX, 2 ) + Math.pow( event.pageY-dd.pageY, 2 ) < Math.pow( dd.distance, 2 ) )
break; // distance tolerance not reached
event.target = dd.target; // force target from "mousedown" event (fix distance issue)
drag.hijack( event, "dragstart", dd ); // trigger "dragstart"
if ( dd.propagates ) // "dragstart" not rejected
dd.dragging = true; // activate interaction
// mousemove, dragging
case 'touchmove':
event.preventDefault();
case 'mousemove':
if ( dd.dragging ){
// trigger "drag"
drag.hijack( event, "drag", dd );
if ( dd.propagates ){
// manage drop events
if ( dd.drop !== false && $special.drop )
$special.drop.handler( event, dd ); // "dropstart", "dropend"
break; // "drag" not rejected, stop
}
event.type = "mouseup"; // helps "drop" handler behave
}
// mouseup, stop dragging
case 'touchend':
case 'mouseup':
default:
if ( drag.touched )
$event.remove( drag.touched, "touchmove touchend", drag.handler ); // remove touch events
else
$event.remove( document, "mousemove mouseup", drag.handler ); // remove page events
if ( dd.dragging ){
if ( dd.drop !== false && $special.drop )
$special.drop.handler( event, dd ); // "drop"
drag.hijack( event, "dragend", dd ); // trigger "dragend"
}
drag.textselect( true ); // enable text selection
// if suppressing click events...
if ( dd.click === false && dd.dragging )
$.data( dd.mousedown, "suppress.click", new Date().getTime() + 5 );
dd.dragging = drag.touched = false; // deactivate element
break;
}
},
// re-use event object for custom events
hijack: function( event, type, dd, x, elem ){
// not configured
if ( !dd )
return;
// remember the original event and type
var orig = { event:event.originalEvent, type:event.type },
// is the event drag related or drog related?
mode = type.indexOf("drop") ? "drag" : "drop",
// iteration vars
result, i = x || 0, ia, $elems, callback,
len = !isNaN( x ) ? x : dd.interactions.length;
// modify the event type
event.type = type;
// protects originalEvent from side-effects
var noop = function(){};
event.originalEvent = new jQuery.Event(orig.event, {
preventDefault: noop,
stopPropagation: noop,
stopImmediatePropagation: noop
});
// initialize the results
dd.results = [];
// handle each interacted element
do if ( ia = dd.interactions[ i ] ){
// validate the interaction
if ( type !== "dragend" && ia.cancelled )
continue;
// set the dragdrop properties on the event object
callback = drag.properties( event, dd, ia );
// prepare for more results
ia.results = [];
// handle each element
$( elem || ia[ mode ] || dd.droppable ).each(function( p, subject ){
// identify drag or drop targets individually
callback.target = subject;
// force propagtion of the custom event
event.isPropagationStopped = function(){ return false; };
// handle the event
result = subject ? $event.dispatch.call( subject, event, callback ) : null;
// stop the drag interaction for this element
if ( result === false ){
if ( mode == "drag" ){
ia.cancelled = true;
dd.propagates -= 1;
}
if ( type == "drop" ){
ia[ mode ][p] = null;
}
}
// assign any dropinit elements
else if ( type == "dropinit" )
ia.droppable.push( drag.element( result ) || subject );
// accept a returned proxy element
if ( type == "dragstart" )
ia.proxy = $( drag.element( result ) || ia.drag )[0];
// remember this result
ia.results.push( result );
// forget the event result, for recycling
delete event.result;
// break on cancelled handler
if ( type !== "dropinit" )
return result;
});
// flatten the results
dd.results[ i ] = drag.flatten( ia.results );
// accept a set of valid drop targets
if ( type == "dropinit" )
ia.droppable = drag.flatten( ia.droppable );
// locate drop targets
if ( type == "dragstart" && !ia.cancelled )
callback.update();
}
while ( ++i < len )
// restore the original event & type
event.type = orig.type;
event.originalEvent = orig.event;
// return all handler results
return drag.flatten( dd.results );
},
// extend the callback object with drag/drop properties...
properties: function( event, dd, ia ){
var obj = ia.callback;
// elements
obj.drag = ia.drag;
obj.proxy = ia.proxy || ia.drag;
// starting mouse position
obj.startX = dd.pageX;
obj.startY = dd.pageY;
// current distance dragged
obj.deltaX = event.pageX - dd.pageX;
obj.deltaY = event.pageY - dd.pageY;
// original element position
obj.originalX = ia.offset.left;
obj.originalY = ia.offset.top;
// adjusted element position
obj.offsetX = obj.originalX + obj.deltaX;
obj.offsetY = obj.originalY + obj.deltaY;
// assign the drop targets information
obj.drop = drag.flatten( ( ia.drop || [] ).slice() );
obj.available = drag.flatten( ( ia.droppable || [] ).slice() );
return obj;
},
// determine is the argument is an element or jquery instance
element: function( arg ){
if ( arg && ( arg.jquery || arg.nodeType == 1 ) )
return arg;
},
// flatten nested jquery objects and arrays into a single dimension array
flatten: function( arr ){
return $.map( arr, function( member ){
return member && member.jquery ? $.makeArray( member ) :
member && member.length ? drag.flatten( member ) : member;
});
},
// toggles text selection attributes ON (true) or OFF (false)
textselect: function( bool ){
$( document )[ bool ? "off" : "on" ]("selectstart", drag.dontstart )
.css("MozUserSelect", bool ? "" : "none" );
// .attr("unselectable", bool ? "off" : "on" )
document.unselectable = bool ? "off" : "on";
},
// suppress "selectstart" and "ondragstart" events
dontstart: function(){
return false;
},
// a callback instance contructor
callback: function(){}
};
// callback methods
drag.callback.prototype = {
update: function(){
if ( $special.drop && this.available.length )
$.each( this.available, function( i ){
$special.drop.locate( this, i );
});
}
};
// patch $.event.$dispatch to allow suppressing clicks
var $dispatch = $event.dispatch;
$event.dispatch = function( event ){
if ( $.data( this, "suppress."+ event.type ) - new Date().getTime() > 0 ){
$.removeData( this, "suppress."+ event.type );
return;
}
return $dispatch.apply( this, arguments );
};
// share the same special event configuration with related events...
$special.draginit = $special.dragstart = $special.dragend = drag;
})( jQuery );