lib/dojo/dnd/Source.js.uncompressed.js

   1 define("dojo/dnd/Source", ["../main", "./Selector", "./Manager"], function(dojo, Selector, Manager) {
   2         // module:
   3         //              dojo/dnd/Source
   4         // summary:
   5         //              TODOC
   6
   7 /*=====
   8 Selector = dojo.dnd.Selector;
   9 =====*/
  10
  11 /*
  12         Container property:
  13                 "Horizontal"- if this is the horizontal container
  14         Source states:
  15                 ""                      - normal state
  16                 "Moved"         - this source is being moved
  17                 "Copied"        - this source is being copied
  18         Target states:
  19                 ""                      - normal state
  20                 "Disabled"      - the target cannot accept an avatar
  21         Target anchor state:
  22                 ""                      - item is not selected
  23                 "Before"        - insert point is before the anchor
  24                 "After"         - insert point is after the anchor
  25 */
  26
  27 /*=====
  28 dojo.dnd.__SourceArgs = function(){
  29         //      summary:
  30         //              a dict of parameters for DnD Source configuration. Note that any
  31         //              property on Source elements may be configured, but this is the
  32         //              short-list
  33         //      isSource: Boolean?
  34         //              can be used as a DnD source. Defaults to true.
  35         //      accept: Array?
  36         //              list of accepted types (text strings) for a target; defaults to
  37         //              ["text"]
  38         //      autoSync: Boolean
  39         //              if true refreshes the node list on every operation; false by default
  40         //      copyOnly: Boolean?
  41         //              copy items, if true, use a state of Ctrl key otherwise,
  42         //              see selfCopy and selfAccept for more details
  43         //      delay: Number
  44         //              the move delay in pixels before detecting a drag; 0 by default
  45         //      horizontal: Boolean?
  46         //              a horizontal container, if true, vertical otherwise or when omitted
  47         //      selfCopy: Boolean?
  48         //              copy items by default when dropping on itself,
  49         //              false by default, works only if copyOnly is true
  50         //      selfAccept: Boolean?
  51         //              accept its own items when copyOnly is true,
  52         //              true by default, works only if copyOnly is true
  53         //      withHandles: Boolean?
  54         //              allows dragging only by handles, false by default
  55         //  generateText: Boolean?
  56         //              generate text node for drag and drop, true by default
  57         this.isSource = isSource;
  58         this.accept = accept;
  59         this.autoSync = autoSync;
  60         this.copyOnly = copyOnly;
  61         this.delay = delay;
  62         this.horizontal = horizontal;
  63         this.selfCopy = selfCopy;
  64         this.selfAccept = selfAccept;
  65         this.withHandles = withHandles;
  66         this.generateText = true;
  67 }
  68 =====*/
  69
  70 // For back-compat, remove in 2.0.
  71 if(!dojo.isAsync){
  72         dojo.ready(0, function(){
  73                 var requires = ["dojo/dnd/AutoSource", "dojo/dnd/Target"];
  74                 require(requires);      // use indirection so modules not rolled into a build
  75         })
  76 }
  77
  78 return dojo.declare("dojo.dnd.Source", Selector, {
  79         // summary:
  80         //              a Source object, which can be used as a DnD source, or a DnD target
  81
  82         // object attributes (for markup)
  83         isSource: true,
  84         horizontal: false,
  85         copyOnly: false,
  86         selfCopy: false,
  87         selfAccept: true,
  88         skipForm: false,
  89         withHandles: false,
  90         autoSync: false,
  91         delay: 0, // pixels
  92         accept: ["text"],
  93         generateText: true,
  94
  95         constructor: function(/*DOMNode|String*/node, /*dojo.dnd.__SourceArgs?*/params){
  96                 // summary:
  97                 //              a constructor of the Source
  98                 // node:
  99                 //              node or node's id to build the source on
 100                 // params:
 101                 //              any property of this class may be configured via the params
 102                 //              object which is mixed-in to the `dojo.dnd.Source` instance
 103                 dojo.mixin(this, dojo.mixin({}, params));
 104                 var type = this.accept;
 105                 if(type.length){
 106                         this.accept = {};
 107                         for(var i = 0; i < type.length; ++i){
 108                                 this.accept[type[i]] = 1;
 109                         }
 110                 }
 111                 // class-specific variables
 112                 this.isDragging = false;
 113                 this.mouseDown = false;
 114                 this.targetAnchor = null;
 115                 this.targetBox = null;
 116                 this.before = true;
 117                 this._lastX = 0;
 118                 this._lastY = 0;
 119                 // states
 120                 this.sourceState  = "";
 121                 if(this.isSource){
 122                         dojo.addClass(this.node, "dojoDndSource");
 123                 }
 124                 this.targetState  = "";
 125                 if(this.accept){
 126                         dojo.addClass(this.node, "dojoDndTarget");
 127                 }
 128                 if(this.horizontal){
 129                         dojo.addClass(this.node, "dojoDndHorizontal");
 130                 }
 131                 // set up events
 132                 this.topics = [
 133                         dojo.subscribe("/dnd/source/over", this, "onDndSourceOver"),
 134                         dojo.subscribe("/dnd/start",  this, "onDndStart"),
 135                         dojo.subscribe("/dnd/drop",   this, "onDndDrop"),
 136                         dojo.subscribe("/dnd/cancel", this, "onDndCancel")
 137                 ];
 138         },
 139
 140         // methods
 141         checkAcceptance: function(source, nodes){
 142                 // summary:
 143                 //              checks if the target can accept nodes from this source
 144                 // source: Object
 145                 //              the source which provides items
 146                 // nodes: Array
 147                 //              the list of transferred items
 148                 if(this == source){
 149                         return !this.copyOnly || this.selfAccept;
 150                 }
 151                 for(var i = 0; i < nodes.length; ++i){
 152                         var type = source.getItem(nodes[i].id).type;
 153                         // type instanceof Array
 154                         var flag = false;
 155                         for(var j = 0; j < type.length; ++j){
 156                                 if(type[j] in this.accept){
 157                                         flag = true;
 158                                         break;
 159                                 }
 160                         }
 161                         if(!flag){
 162                                 return false;   // Boolean
 163                         }
 164                 }
 165                 return true;    // Boolean
 166         },
 167         copyState: function(keyPressed, self){
 168                 // summary:
 169                 //              Returns true if we need to copy items, false to move.
 170                 //              It is separated to be overwritten dynamically, if needed.
 171                 // keyPressed: Boolean
 172                 //              the "copy" key was pressed
 173                 // self: Boolean?
 174                 //              optional flag that means that we are about to drop on itself
 175
 176                 if(keyPressed){ return true; }
 177                 if(arguments.length < 2){
 178                         self = this == Manager.manager().target;
 179                 }
 180                 if(self){
 181                         if(this.copyOnly){
 182                                 return this.selfCopy;
 183                         }
 184                 }else{
 185                         return this.copyOnly;
 186                 }
 187                 return false;   // Boolean
 188         },
 189         destroy: function(){
 190                 // summary:
 191                 //              prepares the object to be garbage-collected
 192                 dojo.dnd.Source.superclass.destroy.call(this);
 193                 dojo.forEach(this.topics, dojo.unsubscribe);
 194                 this.targetAnchor = null;
 195         },
 196
 197         // mouse event processors
 198         onMouseMove: function(e){
 199                 // summary:
 200                 //              event processor for onmousemove
 201                 // e: Event
 202                 //              mouse event
 203                 if(this.isDragging && this.targetState == "Disabled"){ return; }
 204                 dojo.dnd.Source.superclass.onMouseMove.call(this, e);
 205                 var m = Manager.manager();
 206                 if(!this.isDragging){
 207                         if(this.mouseDown && this.isSource &&
 208                                         (Math.abs(e.pageX - this._lastX) > this.delay || Math.abs(e.pageY - this._lastY) > this.delay)){
 209                                 var nodes = this.getSelectedNodes();
 210                                 if(nodes.length){
 211                                         m.startDrag(this, nodes, this.copyState(dojo.isCopyKey(e), true));
 212                                 }
 213                         }
 214                 }
 215                 if(this.isDragging){
 216                         // calculate before/after
 217                         var before = false;
 218                         if(this.current){
 219                                 if(!this.targetBox || this.targetAnchor != this.current){
 220                                         this.targetBox = dojo.position(this.current, true);
 221                                 }
 222                                 if(this.horizontal){
 223                                         before = (e.pageX - this.targetBox.x) < (this.targetBox.w / 2);
 224                                 }else{
 225                                         before = (e.pageY - this.targetBox.y) < (this.targetBox.h / 2);
 226                                 }
 227                         }
 228                         if(this.current != this.targetAnchor || before != this.before){
 229                                 this._markTargetAnchor(before);
 230                                 m.canDrop(!this.current || m.source != this || !(this.current.id in this.selection));
 231                         }
 232                 }
 233         },
 234         onMouseDown: function(e){
 235                 // summary:
 236                 //              event processor for onmousedown
 237                 // e: Event
 238                 //              mouse event
 239                 if(!this.mouseDown && this._legalMouseDown(e) && (!this.skipForm || !dojo.dnd.isFormElement(e))){
 240                         this.mouseDown = true;
 241                         this._lastX = e.pageX;
 242                         this._lastY = e.pageY;
 243                         dojo.dnd.Source.superclass.onMouseDown.call(this, e);
 244                 }
 245         },
 246         onMouseUp: function(e){
 247                 // summary:
 248                 //              event processor for onmouseup
 249                 // e: Event
 250                 //              mouse event
 251                 if(this.mouseDown){
 252                         this.mouseDown = false;
 253                         dojo.dnd.Source.superclass.onMouseUp.call(this, e);
 254                 }
 255         },
 256
 257         // topic event processors
 258         onDndSourceOver: function(source){
 259                 // summary:
 260                 //              topic event processor for /dnd/source/over, called when detected a current source
 261                 // source: Object
 262                 //              the source which has the mouse over it
 263                 if(this != source){
 264                         this.mouseDown = false;
 265                         if(this.targetAnchor){
 266                                 this._unmarkTargetAnchor();
 267                         }
 268                 }else if(this.isDragging){
 269                         var m = Manager.manager();
 270                         m.canDrop(this.targetState != "Disabled" && (!this.current || m.source != this || !(this.current.id in this.selection)));
 271                 }
 272         },
 273         onDndStart: function(source, nodes, copy){
 274                 // summary:
 275                 //              topic event processor for /dnd/start, called to initiate the DnD operation
 276                 // source: Object
 277                 //              the source which provides items
 278                 // nodes: Array
 279                 //              the list of transferred items
 280                 // copy: Boolean
 281                 //              copy items, if true, move items otherwise
 282                 if(this.autoSync){ this.sync(); }
 283                 if(this.isSource){
 284                         this._changeState("Source", this == source ? (copy ? "Copied" : "Moved") : "");
 285                 }
 286                 var accepted = this.accept && this.checkAcceptance(source, nodes);
 287                 this._changeState("Target", accepted ? "" : "Disabled");
 288                 if(this == source){
 289                         Manager.manager().overSource(this);
 290                 }
 291                 this.isDragging = true;
 292         },
 293         onDndDrop: function(source, nodes, copy, target){
 294                 // summary:
 295                 //              topic event processor for /dnd/drop, called to finish the DnD operation
 296                 // source: Object
 297                 //              the source which provides items
 298                 // nodes: Array
 299                 //              the list of transferred items
 300                 // copy: Boolean
 301                 //              copy items, if true, move items otherwise
 302                 // target: Object
 303                 //              the target which accepts items
 304                 if(this == target){
 305                         // this one is for us => move nodes!
 306                         this.onDrop(source, nodes, copy);
 307                 }
 308                 this.onDndCancel();
 309         },
 310         onDndCancel: function(){
 311                 // summary:
 312                 //              topic event processor for /dnd/cancel, called to cancel the DnD operation
 313                 if(this.targetAnchor){
 314                         this._unmarkTargetAnchor();
 315                         this.targetAnchor = null;
 316                 }
 317                 this.before = true;
 318                 this.isDragging = false;
 319                 this.mouseDown = false;
 320                 this._changeState("Source", "");
 321                 this._changeState("Target", "");
 322         },
 323
 324         // local events
 325         onDrop: function(source, nodes, copy){
 326                 // summary:
 327                 //              called only on the current target, when drop is performed
 328                 // source: Object
 329                 //              the source which provides items
 330                 // nodes: Array
 331                 //              the list of transferred items
 332                 // copy: Boolean
 333                 //              copy items, if true, move items otherwise
 334
 335                 if(this != source){
 336                         this.onDropExternal(source, nodes, copy);
 337                 }else{
 338                         this.onDropInternal(nodes, copy);
 339                 }
 340         },
 341         onDropExternal: function(source, nodes, copy){
 342                 // summary:
 343                 //              called only on the current target, when drop is performed
 344                 //              from an external source
 345                 // source: Object
 346                 //              the source which provides items
 347                 // nodes: Array
 348                 //              the list of transferred items
 349                 // copy: Boolean
 350                 //              copy items, if true, move items otherwise
 351
 352                 var oldCreator = this._normalizedCreator;
 353                 // transferring nodes from the source to the target
 354                 if(this.creator){
 355                         // use defined creator
 356                         this._normalizedCreator = function(node, hint){
 357                                 return oldCreator.call(this, source.getItem(node.id).data, hint);
 358                         };
 359                 }else{
 360                         // we have no creator defined => move/clone nodes
 361                         if(copy){
 362                                 // clone nodes
 363                                 this._normalizedCreator = function(node, hint){
 364                                         var t = source.getItem(node.id);
 365                                         var n = node.cloneNode(true);
 366                                         n.id = dojo.dnd.getUniqueId();
 367                                         return {node: n, data: t.data, type: t.type};
 368                                 };
 369                         }else{
 370                                 // move nodes
 371                                 this._normalizedCreator = function(node, hint){
 372                                         var t = source.getItem(node.id);
 373                                         source.delItem(node.id);
 374                                         return {node: node, data: t.data, type: t.type};
 375                                 };
 376                         }
 377                 }
 378                 this.selectNone();
 379                 if(!copy && !this.creator){
 380                         source.selectNone();
 381                 }
 382                 this.insertNodes(true, nodes, this.before, this.current);
 383                 if(!copy && this.creator){
 384                         source.deleteSelectedNodes();
 385                 }
 386                 this._normalizedCreator = oldCreator;
 387         },
 388         onDropInternal: function(nodes, copy){
 389                 // summary:
 390                 //              called only on the current target, when drop is performed
 391                 //              from the same target/source
 392                 // nodes: Array
 393                 //              the list of transferred items
 394                 // copy: Boolean
 395                 //              copy items, if true, move items otherwise
 396
 397                 var oldCreator = this._normalizedCreator;
 398                 // transferring nodes within the single source
 399                 if(this.current && this.current.id in this.selection){
 400                         // do nothing
 401                         return;
 402                 }
 403                 if(copy){
 404                         if(this.creator){
 405                                 // create new copies of data items
 406                                 this._normalizedCreator = function(node, hint){
 407                                         return oldCreator.call(this, this.getItem(node.id).data, hint);
 408                                 };
 409                         }else{
 410                                 // clone nodes
 411                                 this._normalizedCreator = function(node, hint){
 412                                         var t = this.getItem(node.id);
 413                                         var n = node.cloneNode(true);
 414                                         n.id = dojo.dnd.getUniqueId();
 415                                         return {node: n, data: t.data, type: t.type};
 416                                 };
 417                         }
 418                 }else{
 419                         // move nodes
 420                         if(!this.current){
 421                                 // do nothing
 422                                 return;
 423                         }
 424                         this._normalizedCreator = function(node, hint){
 425                                 var t = this.getItem(node.id);
 426                                 return {node: node, data: t.data, type: t.type};
 427                         };
 428                 }
 429                 this._removeSelection();
 430                 this.insertNodes(true, nodes, this.before, this.current);
 431                 this._normalizedCreator = oldCreator;
 432         },
 433         onDraggingOver: function(){
 434                 // summary:
 435                 //              called during the active DnD operation, when items
 436                 //              are dragged over this target, and it is not disabled
 437         },
 438         onDraggingOut: function(){
 439                 // summary:
 440                 //              called during the active DnD operation, when items
 441                 //              are dragged away from this target, and it is not disabled
 442         },
 443
 444         // utilities
 445         onOverEvent: function(){
 446                 // summary:
 447                 //              this function is called once, when mouse is over our container
 448                 dojo.dnd.Source.superclass.onOverEvent.call(this);
 449                 Manager.manager().overSource(this);
 450                 if(this.isDragging && this.targetState != "Disabled"){
 451                         this.onDraggingOver();
 452                 }
 453         },
 454         onOutEvent: function(){
 455                 // summary:
 456                 //              this function is called once, when mouse is out of our container
 457                 dojo.dnd.Source.superclass.onOutEvent.call(this);
 458                 Manager.manager().outSource(this);
 459                 if(this.isDragging && this.targetState != "Disabled"){
 460                         this.onDraggingOut();
 461                 }
 462         },
 463         _markTargetAnchor: function(before){
 464                 // summary:
 465                 //              assigns a class to the current target anchor based on "before" status
 466                 // before: Boolean
 467                 //              insert before, if true, after otherwise
 468                 if(this.current == this.targetAnchor && this.before == before){ return; }
 469                 if(this.targetAnchor){
 470                         this._removeItemClass(this.targetAnchor, this.before ? "Before" : "After");
 471                 }
 472                 this.targetAnchor = this.current;
 473                 this.targetBox = null;
 474                 this.before = before;
 475                 if(this.targetAnchor){
 476                         this._addItemClass(this.targetAnchor, this.before ? "Before" : "After");
 477                 }
 478         },
 479         _unmarkTargetAnchor: function(){
 480                 // summary:
 481                 //              removes a class of the current target anchor based on "before" status
 482                 if(!this.targetAnchor){ return; }
 483                 this._removeItemClass(this.targetAnchor, this.before ? "Before" : "After");
 484                 this.targetAnchor = null;
 485                 this.targetBox = null;
 486                 this.before = true;
 487         },
 488         _markDndStatus: function(copy){
 489                 // summary:
 490                 //              changes source's state based on "copy" status
 491                 this._changeState("Source", copy ? "Copied" : "Moved");
 492         },
 493         _legalMouseDown: function(e){
 494                 // summary:
 495                 //              checks if user clicked on "approved" items
 496                 // e: Event
 497                 //              mouse event
 498
 499                 // accept only the left mouse button
 500                 if(!dojo.mouseButtons.isLeft(e)){ return false; }
 501
 502                 if(!this.withHandles){ return true; }
 503
 504                 // check for handles
 505                 for(var node = e.target; node && node !== this.node; node = node.parentNode){
 506                         if(dojo.hasClass(node, "dojoDndHandle")){ return true; }
 507                         if(dojo.hasClass(node, "dojoDndItem") || dojo.hasClass(node, "dojoDndIgnore")){ break; }
 508                 }
 509                 return false;   // Boolean
 510         }
 511 });
 512
 513 });