]> git.pond.sub.org Git - eow/blobdiff - static/dojo-release-1.1.1/dojo/dnd/Mover.js
add Dojo 1.1.1
[eow] / static / dojo-release-1.1.1 / dojo / dnd / Mover.js
diff --git a/static/dojo-release-1.1.1/dojo/dnd/Mover.js b/static/dojo-release-1.1.1/dojo/dnd/Mover.js
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+if(!dojo._hasResource["dojo.dnd.Mover"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
+dojo._hasResource["dojo.dnd.Mover"] = true;
+dojo.provide("dojo.dnd.Mover");
+
+dojo.require("dojo.dnd.common");
+dojo.require("dojo.dnd.autoscroll");
+
+dojo.declare("dojo.dnd.Mover", null, {
+       constructor: function(node, e, host){
+               // summary: an object, which makes a node follow the mouse, 
+               //      used as a default mover, and as a base class for custom movers
+               // node: Node: a node (or node's id) to be moved
+               // e: Event: a mouse event, which started the move;
+               //      only pageX and pageY properties are used
+               // host: Object?: object which implements the functionality of the move,
+               //       and defines proper events (onMoveStart and onMoveStop)
+               this.node = dojo.byId(node);
+               this.marginBox = {l: e.pageX, t: e.pageY};
+               this.mouseButton = e.button;
+               var h = this.host = host, d = node.ownerDocument, 
+                       firstEvent = dojo.connect(d, "onmousemove", this, "onFirstMove");
+               this.events = [
+                       dojo.connect(d, "onmousemove", this, "onMouseMove"),
+                       dojo.connect(d, "onmouseup",   this, "onMouseUp"),
+                       // cancel text selection and text dragging
+                       dojo.connect(d, "ondragstart",   dojo, "stopEvent"),
+                       dojo.connect(d, "onselectstart", dojo, "stopEvent"),
+                       firstEvent
+               ];
+               // notify that the move has started
+               if(h && h.onMoveStart){
+                       h.onMoveStart(this);
+               }
+       },
+       // mouse event processors
+       onMouseMove: function(e){
+               // summary: event processor for onmousemove
+               // e: Event: mouse event
+               dojo.dnd.autoScroll(e);
+               var m = this.marginBox;
+               this.host.onMove(this, {l: m.l + e.pageX, t: m.t + e.pageY});
+       },
+       onMouseUp: function(e){
+               if(this.mouseButton == e.button){
+                       this.destroy();
+               }
+       },
+       // utilities
+       onFirstMove: function(){
+               // summary: makes the node absolute; it is meant to be called only once
+               var s = this.node.style, l, t;
+               switch(s.position){
+                       case "relative":
+                       case "absolute":
+                               // assume that left and top values are in pixels already
+                               l = Math.round(parseFloat(s.left));
+                               t = Math.round(parseFloat(s.top));
+                               break;
+                       default:
+                               s.position = "absolute";        // enforcing the absolute mode
+                               var m = dojo.marginBox(this.node);
+                               l = m.l;
+                               t = m.t;
+                               break;
+               }
+               this.marginBox.l = l - this.marginBox.l;
+               this.marginBox.t = t - this.marginBox.t;
+               this.host.onFirstMove(this);
+               dojo.disconnect(this.events.pop());
+       },
+       destroy: function(){
+               // summary: stops the move, deletes all references, so the object can be garbage-collected
+               dojo.forEach(this.events, dojo.disconnect);
+               // undo global settings
+               var h = this.host;
+               if(h && h.onMoveStop){
+                       h.onMoveStop(this);
+               }
+               // destroy objects
+               this.events = this.node = null;
+       }
+});
+
+}