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

   1 if(!dojo._hasResource["dojo.dnd.Mover"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
   2 dojo._hasResource["dojo.dnd.Mover"] = true;
   3 dojo.provide("dojo.dnd.Mover");
   4
   5 dojo.require("dojo.dnd.common");
   6 dojo.require("dojo.dnd.autoscroll");
   7
   8 dojo.declare("dojo.dnd.Mover", null, {
   9         constructor: function(node, e, host){
  10                 // summary: an object, which makes a node follow the mouse,
  11                 //      used as a default mover, and as a base class for custom movers
  12                 // node: Node: a node (or node's id) to be moved
  13                 // e: Event: a mouse event, which started the move;
  14                 //      only pageX and pageY properties are used
  15                 // host: Object?: object which implements the functionality of the move,
  16                 //       and defines proper events (onMoveStart and onMoveStop)
  17                 this.node = dojo.byId(node);
  18                 this.marginBox = {l: e.pageX, t: e.pageY};
  19                 this.mouseButton = e.button;
  20                 var h = this.host = host, d = node.ownerDocument,
  21                         firstEvent = dojo.connect(d, "onmousemove", this, "onFirstMove");
  22                 this.events = [
  23                         dojo.connect(d, "onmousemove", this, "onMouseMove"),
  24                         dojo.connect(d, "onmouseup",   this, "onMouseUp"),
  25                         // cancel text selection and text dragging
  26                         dojo.connect(d, "ondragstart",   dojo, "stopEvent"),
  27                         dojo.connect(d, "onselectstart", dojo, "stopEvent"),
  28                         firstEvent
  29                 ];
  30                 // notify that the move has started
  31                 if(h && h.onMoveStart){
  32                         h.onMoveStart(this);
  33                 }
  34         },
  35         // mouse event processors
  36         onMouseMove: function(e){
  37                 // summary: event processor for onmousemove
  38                 // e: Event: mouse event
  39                 dojo.dnd.autoScroll(e);
  40                 var m = this.marginBox;
  41                 this.host.onMove(this, {l: m.l + e.pageX, t: m.t + e.pageY});
  42         },
  43         onMouseUp: function(e){
  44                 if(this.mouseButton == e.button){
  45                         this.destroy();
  46                 }
  47         },
  48         // utilities
  49         onFirstMove: function(){
  50                 // summary: makes the node absolute; it is meant to be called only once
  51                 var s = this.node.style, l, t;
  52                 switch(s.position){
  53                         case "relative":
  54                         case "absolute":
  55                                 // assume that left and top values are in pixels already
  56                                 l = Math.round(parseFloat(s.left));
  57                                 t = Math.round(parseFloat(s.top));
  58                                 break;
  59                         default:
  60                                 s.position = "absolute";        // enforcing the absolute mode
  61                                 var m = dojo.marginBox(this.node);
  62                                 l = m.l;
  63                                 t = m.t;
  64                                 break;
  65                 }
  66                 this.marginBox.l = l - this.marginBox.l;
  67                 this.marginBox.t = t - this.marginBox.t;
  68                 this.host.onFirstMove(this);
  69                 dojo.disconnect(this.events.pop());
  70         },
  71         destroy: function(){
  72                 // summary: stops the move, deletes all references, so the object can be garbage-collected
  73                 dojo.forEach(this.events, dojo.disconnect);
  74                 // undo global settings
  75                 var h = this.host;
  76                 if(h && h.onMoveStop){
  77                         h.onMoveStop(this);
  78                 }
  79                 // destroy objects
  80                 this.events = this.node = null;
  81         }
  82 });
  83
  84 }