git.pond.sub.org Git - eow/blob - static/dojo-release-1.1.1/dojox/gfx/Mover.js

   1 if(!dojo._hasResource["dojox.gfx.Mover"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
   2 dojo._hasResource["dojox.gfx.Mover"] = true;
   3 dojo.provide("dojox.gfx.Mover");
   4
   5 dojo.declare("dojox.gfx.Mover", null, {
   6         constructor: function(shape, e, host){
   7                 // summary: an object, which makes a shape follow the mouse,
   8                 //      used as a default mover, and as a base class for custom movers
   9                 // shape: dojox.gfx.Shape: a shape object to be moved
  10                 // e: Event: a mouse event, which started the move;
  11                 //      only clientX and clientY properties are used
  12                 // host: Object?: object which implements the functionality of the move,
  13                 //       and defines proper events (onMoveStart and onMoveStop)
  14                 this.shape = shape;
  15                 this.lastX = e.clientX
  16                 this.lastY = e.clientY;
  17                 var h = this.host = host, d = document,
  18                         firstEvent = dojo.connect(d, "onmousemove", this, "onFirstMove");
  19                 this.events = [
  20                         dojo.connect(d, "onmousemove", this, "onMouseMove"),
  21                         dojo.connect(d, "onmouseup",   this, "destroy"),
  22                         // cancel text selection and text dragging
  23                         dojo.connect(d, "ondragstart",   dojo, "stopEvent"),
  24                         dojo.connect(d, "onselectstart", dojo, "stopEvent"),
  25                         firstEvent
  26                 ];
  27                 // notify that the move has started
  28                 if(h && h.onMoveStart){
  29                         h.onMoveStart(this);
  30                 }
  31         },
  32         // mouse event processors
  33         onMouseMove: function(e){
  34                 // summary: event processor for onmousemove
  35                 // e: Event: mouse event
  36                 var x = e.clientX;
  37                 var y = e.clientY;
  38                 this.host.onMove(this, {dx: x - this.lastX, dy: y - this.lastY});
  39                 this.lastX = x;
  40                 this.lastY = y;
  41                 dojo.stopEvent(e);
  42         },
  43         // utilities
  44         onFirstMove: function(){
  45                 // summary: it is meant to be called only once
  46                 this.host.onFirstMove(this);
  47                 dojo.disconnect(this.events.pop());
  48         },
  49         destroy: function(){
  50                 // summary: stops the move, deletes all references, so the object can be garbage-collected
  51                 dojo.forEach(this.events, dojo.disconnect);
  52                 // undo global settings
  53                 var h = this.host;
  54                 if(h && h.onMoveStop){
  55                         h.onMoveStop(this);
  56                 }
  57                 // destroy objects
  58                 this.events = this.shape = null;
  59         }
  60 });
  61
  62 }