wp/nwyj/.svn/pristine/6f/6f633c04374be3abd3b3ff2d802dc5eb1f24c8e3.svn-base

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
					this.node.style.position = "absolute"; // enforcing the
															// absolute mode
					var m = dojo.marginBox(this.node);
					m.l -= this.marginBox.l;
					m.t -= this.marginBox.t;
					this.marginBox = m;
					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;
				}
			});

}