[OpenLayers-Users] Custom Controls

[André Matos]

Hi Guys!

 

I am starting on OpenLayers API and I have two questions
 

 

I am  studing the controls and I have notice that, there’s 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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