[OpenLayers-Users] Re: problem - map errorneously auto zoom in when continuously clicking on a marker

[JK Chen]

This does solve my problem. Thanks.

JK

-----Original Message-----
From: openlayers-users-bounces at lists.osgeo.org [mailto:openlayers-users-bounces at lists.osgeo.org] On Behalf Of shitake83
Sent: Tuesday, June 14, 2011 10:23 AM
To: users at openlayers.org
Subject: [OpenLayers-Users] Re: problem - map errorneously auto zoom in when continuously clicking on a marker

Hi.
You could "restrict" double-clicking to zoom, by removing the control from the map.
Then you wouldn't be able to double-click to zoom, but you could still scroll the mousewheel to zoom in or out, or just let your users use the slider.

The double click function resides in OpenLayers.Control.Navigation http://dev.openlayers.org/docs/files/OpenLayers/Control/Navigation-js.html

This is the original implementation:

defaultDblClick: function (evt) {
        var newCenter = this.map.getLonLatFromViewPortPx( evt.xy ); 
        this.map.setCenter(newCenter, this.map.zoom + 1); }
    

To disable doubleClick add this:
__________________________
var Navigation = new OpenLayers.Control.Navigation({
defaultDblClick: function(event) { return; } });

map.addControl(Navigation);


You have to call the addControl method, otherwise the standard defaultDblClick function wont be overwritten. 

I havent tried it, but you could change the implementation in a way, that it checks to see if you have hit a marker, which would mean that a popup would fire up or if you were trying to induce a zoom with the dblClick. If a marker was hit, dont take the dblClick as a "dblClick to zoom in" but as a "doubleClickToShowPopup".


var Navigation = new OpenLayers.Control.Navigation({
defaultDblClick: function(evt) {
if(determineDblClick() == 0)
      {
        dblClickToZoom();
      }
else{ doubleClickToShowPopup(); }
}
return;}


Cheers.Shitake.

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