Hi Guys!
I am starting on OpenLayers API and I have two questions
I am studing the controls and I have notice that, theres no API methods or
API properties in Control type. That means the open layers developers can
change it, without any advise.
The way I am doing my controls is this:
MyControl = OpenLayers.Class(OpenLayers.Control, {
//Constructor
initialize: function(){
alert("ctr");
},
//called when the user adds the control to the map. if the control
wants to display information
draw: function(){
OpenLayers.Control.prototype.draw.apply(this);
var div = document.createElement("div");
div.style.width = "100px";
div.style.height = "100px";
div.style.background = "black";
this.div.appendChild(div);
return this.div;
},
//called when the user removes the control from the map
destroy: function(){
OpenLayers.Control.prototype.destroy.apply(this);
alert("destroy");
},
CLASS_NAME: "MYCONTROL"
});
Is this the best way to implement custom controls? Will OpenLayers
developers change the not API methods, initialize, draw, destroy or the div
property defined at Control Class?
I need to know because I want to integrate future releases.
The second question is: Why does Control.destroy method exist? This is the
description in the Control Class destroy method:
Method: destroy
* The destroy method is used to perform any clean up before the control
* is dereferenced. Typically this is where event listeners are removed
* to prevent memory leaks.
But it Is never called. The control is dereferenced at Map.removeControl
method, and this method does not call control.destroy method
Thanks.
André Matos
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