| 2150 |
mathias |
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if(!dojo._hasResource["dojo.dnd.Manager"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dojo.dnd.Manager"] = true;
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dojo.provide("dojo.dnd.Manager");
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dojo.require("dojo.dnd.common");
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dojo.require("dojo.dnd.autoscroll");
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dojo.require("dojo.dnd.Avatar");
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dojo.dnd.Manager = function(){
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// summary: the manager of DnD operations (usually a singleton)
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this.avatar = null;
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this.source = null;
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this.nodes = [];
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this.copy = true;
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this.target = null;
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this.canDropFlag = false;
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this.events = [];
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};
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dojo.extend(dojo.dnd.Manager, {
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// avatar's offset from the mouse
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OFFSET_X: 16,
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OFFSET_Y: 16,
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// methods
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overSource: function(source){
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// summary: called when a source detected a mouse-over conditiion
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// source: Object: the reporter
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if(this.avatar){
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this.target = (source && source.targetState != "Disabled") ? source : null;
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this.avatar.update();
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}
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dojo.publish("/dnd/source/over", [source]);
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},
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outSource: function(source){
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// summary: called when a source detected a mouse-out conditiion
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// source: Object: the reporter
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if(this.avatar){
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if(this.target == source){
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this.target = null;
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this.canDropFlag = false;
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this.avatar.update();
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dojo.publish("/dnd/source/over", [null]);
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}
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}else{
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dojo.publish("/dnd/source/over", [null]);
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}
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},
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startDrag: function(source, nodes, copy){
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// summary: called to initiate the DnD operation
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// source: Object: the source which provides items
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// nodes: Array: the list of transferred items
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// copy: Boolean: copy items, if true, move items otherwise
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this.source = source;
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this.nodes = nodes;
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this.copy = Boolean(copy); // normalizing to true boolean
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this.avatar = this.makeAvatar();
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dojo.body().appendChild(this.avatar.node);
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dojo.publish("/dnd/start", [source, nodes, this.copy]);
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this.events = [
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dojo.connect(dojo.doc, "onmousemove", this, "onMouseMove"),
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dojo.connect(dojo.doc, "onmouseup", this, "onMouseUp"),
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dojo.connect(dojo.doc, "onkeydown", this, "onKeyDown"),
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dojo.connect(dojo.doc, "onkeyup", this, "onKeyUp")
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];
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var c = "dojoDnd" + (copy ? "Copy" : "Move");
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dojo.addClass(dojo.body(), c);
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},
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canDrop: function(flag){
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// summary: called to notify if the current target can accept items
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var canDropFlag = this.target && flag;
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if(this.canDropFlag != canDropFlag){
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this.canDropFlag = canDropFlag;
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this.avatar.update();
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}
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},
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stopDrag: function(){
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// summary: stop the DnD in progress
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dojo.removeClass(dojo.body(), "dojoDndCopy");
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dojo.removeClass(dojo.body(), "dojoDndMove");
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dojo.forEach(this.events, dojo.disconnect);
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this.events = [];
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this.avatar.destroy();
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this.avatar = null;
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this.source = null;
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this.nodes = [];
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},
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makeAvatar: function(){
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// summary: makes the avatar, it is separate to be overwritten dynamically, if needed
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return new dojo.dnd.Avatar(this);
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},
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updateAvatar: function(){
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// summary: updates the avatar, it is separate to be overwritten dynamically, if needed
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this.avatar.update();
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},
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// mouse event processors
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onMouseMove: function(e){
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// summary: event processor for onmousemove
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// e: Event: mouse event
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var a = this.avatar;
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if(a){
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//dojo.dnd.autoScrollNodes(e);
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dojo.dnd.autoScroll(e);
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dojo.marginBox(a.node, {l: e.pageX + this.OFFSET_X, t: e.pageY + this.OFFSET_Y});
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var copy = Boolean(this.source.copyState(dojo.dnd.getCopyKeyState(e)));
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if(this.copy != copy){
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this._setCopyStatus(copy);
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}
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}
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},
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onMouseUp: function(e){
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// summary: event processor for onmouseup
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// e: Event: mouse event
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if(this.avatar && (!("mouseButton" in this.source) || this.source.mouseButton == e.button)){
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if(this.target && this.canDropFlag){
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var params = [this.source, this.nodes, Boolean(this.source.copyState(dojo.dnd.getCopyKeyState(e))), this.target];
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dojo.publish("/dnd/drop/before", params);
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dojo.publish("/dnd/drop", params);
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}else{
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dojo.publish("/dnd/cancel");
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}
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this.stopDrag();
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}
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},
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// keyboard event processors
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onKeyDown: function(e){
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// summary: event processor for onkeydown:
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// watching for CTRL for copy/move status, watching for ESCAPE to cancel the drag
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// e: Event: keyboard event
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if(this.avatar){
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switch(e.keyCode){
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case dojo.keys.CTRL:
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var copy = Boolean(this.source.copyState(true));
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if(this.copy != copy){
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this._setCopyStatus(copy);
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}
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break;
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case dojo.keys.ESCAPE:
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dojo.publish("/dnd/cancel");
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this.stopDrag();
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break;
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}
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}
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},
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onKeyUp: function(e){
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// summary: event processor for onkeyup, watching for CTRL for copy/move status
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// e: Event: keyboard event
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if(this.avatar && e.keyCode == dojo.keys.CTRL){
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var copy = Boolean(this.source.copyState(false));
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if(this.copy != copy){
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this._setCopyStatus(copy);
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}
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}
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},
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// utilities
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_setCopyStatus: function(copy){
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// summary: changes the copy status
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// copy: Boolean: the copy status
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this.copy = copy;
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this.source._markDndStatus(this.copy);
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this.updateAvatar();
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dojo.removeClass(dojo.body(), "dojoDnd" + (this.copy ? "Move" : "Copy"));
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dojo.addClass(dojo.body(), "dojoDnd" + (this.copy ? "Copy" : "Move"));
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}
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});
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// summary: the manager singleton variable, can be overwritten, if needed
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dojo.dnd._manager = null;
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dojo.dnd.manager = function(){
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// summary: returns the current DnD manager, creates one if it is not created yet
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if(!dojo.dnd._manager){
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dojo.dnd._manager = new dojo.dnd.Manager();
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}
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return dojo.dnd._manager; // Object
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};
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}
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