59 lines
1.9 KiB
JavaScript
59 lines
1.9 KiB
JavaScript
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dojo.provide("dojox.gfx.Mover");
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dojo.declare("dojox.gfx.Mover", null, {
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constructor: function(shape, e, host){
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// summary: an object, which makes a shape follow the mouse,
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// used as a default mover, and as a base class for custom movers
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// shape: dojox.gfx.Shape: a shape object to be moved
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// e: Event: a mouse event, which started the move;
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// only clientX and clientY properties are used
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// host: Object?: object which implements the functionality of the move,
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// and defines proper events (onMoveStart and onMoveStop)
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this.shape = shape;
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this.lastX = e.clientX
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this.lastY = e.clientY;
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var h = this.host = host, d = document,
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firstEvent = dojo.connect(d, "onmousemove", this, "onFirstMove");
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this.events = [
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dojo.connect(d, "onmousemove", this, "onMouseMove"),
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dojo.connect(d, "onmouseup", this, "destroy"),
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// cancel text selection and text dragging
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dojo.connect(d, "ondragstart", dojo, "stopEvent"),
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dojo.connect(d, "onselectstart", dojo, "stopEvent"),
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firstEvent
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];
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// notify that the move has started
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if(h && h.onMoveStart){
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h.onMoveStart(this);
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}
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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 x = e.clientX;
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var y = e.clientY;
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this.host.onMove(this, {dx: x - this.lastX, dy: y - this.lastY});
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this.lastX = x;
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this.lastY = y;
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dojo.stopEvent(e);
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},
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// utilities
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onFirstMove: function(){
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// summary: it is meant to be called only once
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this.host.onFirstMove(this);
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dojo.disconnect(this.events.pop());
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},
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destroy: function(){
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// summary: stops the move, deletes all references, so the object can be garbage-collected
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dojo.forEach(this.events, dojo.disconnect);
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// undo global settings
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var h = this.host;
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if(h && h.onMoveStop){
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h.onMoveStop(this);
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}
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// destroy objects
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this.events = this.shape = null;
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}
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});
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