[OpenLayers-Users] How to prevent PanZoomBar clicks from propagating to Click control

[Jay Douillard]

Rohan,

Take a look at : http://www.quirksmode.org/js/events_order.html

And

http://dev.openlayers.org/docs/files/OpenLayers/Events-js.html#OpenLayers.Event.stop

This section from PanZoomBar.js looks like it is stopping propagation, which should stop it from bubbling over to your event.


284 	    divClick: function (evt) {
285 	        if (!OpenLayers.Event.isLeftClick(evt)) {
286 	            return;
287 	        }
288 	        var y = evt.xy.y;
289 	        var top = OpenLayers.Util.pagePosition(evt.object)[1];
290 	        var levels = (y - top)/this.zoomStopHeight;
291 	        if(this.forceFixedZoomLevel || !this.map.fractionalZoom) {
292 	            levels = Math.floor(levels);
293 	        }   
294 	        var zoom = (this.map.getNumZoomLevels() - 1) - levels;
295 	        zoom = Math.min(Math.max(zoom, 0), this.map.getNumZoomLevels() - 1);
296 	        this.map.zoomTo(zoom);
297 	        OpenLayers.Event.stop(evt);
298 	    },

----
Jay Douillard



----- Original Message -----
From: "Rohan Parkes" <rohan.parkes at pelicancorp.com>
To: "Pierre Giraud" <pierre.giraud at camptocamp.com>
Cc: users at openlayers.org
Sent: Sunday, August 8, 2010 4:13:16 PM GMT -08:00 US/Canada Pacific
Subject: Re: [OpenLayers-Users] How to prevent PanZoomBar clicks from propagating to Click control

Thanks for your reply.

I didn’t post the code, because it's trivial, and straight out of one of the
online demos.

But here it is:

OpenLayers.Control.Click = OpenLayers.Class(OpenLayers.Control, {

                defaultHandlerOptions: {
                    'single': true,
                    'double': true,
                    'pixelTolerance': 0,
                    'stopSingle': true,
                    'stopDouble': false
                },

                initialize: function(options)
                {
                    this.handlerOptions = OpenLayers.Util.extend(
                        {}, this.defaultHandlerOptions
                    );
                    OpenLayers.Control.prototype.initialize.apply(
                        this, arguments
                    );
                    this.handler = new OpenLayers.Handler.Click(this,
{'click': this.trigger}, this.handlerOptions);
                }, 

                trigger: processMapClick
     });

processMapClick() just has a call to setCenter(), so the map re-centres to
wherever the user clicks.


The problem is that if the user clicks on the zoom bar, the map, as well as
zooming, also pans. So presumably the click event is going through to the
map as well. This doesn’t happen if they click on the end icons of the zoom
bar, so presumably there is some way of preventing them from going through
to other elements.

I tried adding a handler to the PanZoomBar to try to filter the clicks, but
my attempt was probably very naïve.

Rohan Parkes
Developer
PelicanCorp 
79 Rokeby Street, Collingwood 3066, VIC, AU 
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(p) +613 8413 5212
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-----Original Message-----
From: Pierre Giraud [mailto:pierre.giraud at camptocamp.com] 
Sent: Thursday, 5 August 2010 17:15
To: rohan.parkes at pelicancorp.com
Cc: users at openlayers.org
Subject: Re: [OpenLayers-Users] How to prevent PanZoomBar clicks from
propagating to Click control

I'm not sure I fully understand what your custom control is supposed to do.
However, you can have a look at the fallThrough config option for the
Map object. It may help.

If not, please show us some code.

Regards,
Pierre

On Thu, Aug 5, 2010 at 7:39 AM, Rohan Parkes
<rohan.parkes at pelicancorp.com> wrote:
> My map has a click control that allows users to re-centre the map by
> clicking on it.
>
> However, there is one drawback – it responds to clicks on the PanZoomBar
> control, creating a strange blend of panning and zooming when the user
> zooms.
>
> It doesn’t respond to the Zoom In or Zoom Out icons – just the bar
element.
>
> Presumably I have to find a way to prevent clicks on the Zoom bar from
> propagating to the map.
>
> If the user clicks on the map at least once, it works correctly, and the
map
> does not pan when the user zooms. But if they start by clicking on the
zoom
> bar, they get the unwanted behaviour.
>
> I’ve been messing around with the Handler.Click class, but I can’t get
> anything to work.
>
> The code for the OpenLayers.Control.Click control is from the OL Click
Event
> example. The trigger member just calls a function that re-centres the map.
>
> Rohan Parkes
>
> _______________________________________________
> Users mailing list
> Users at openlayers.org
> http://openlayers.org/mailman/listinfo/users
>
>



-- 
Pierre GIRAUD
Géomaticien, Analyste

Camptocamp France SAS
Savoie Technolac, BP 352
73377 Le Bourget du Lac, Cedex

Tel : 00 33 4 79 44 44 93
Mail : pierre.giraud at camptocamp.com
http://www.camptocamp.com

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