[Users] LayerNodeUI and ZoomSlider

[Hugo]

Thanks Matt,

I will look into your suggestions and try to implement them. I had no idea
that defining ZOOM_LEVELS would mess things up.
Thanks for your clarifications on these subjects.
Cheers,

Hugo

On Fri, Oct 29, 2010 at 2:30 AM, Matt Priour <mpriour at kestrelcomputer.com>wrote:

>  First,
> Do NOT mess with constants. They are in ALL CAPS to let you know they are
> constants and they should not be messed with unless you are purposely
> overwriting them in a new class and know what you are doing.
> If you want the layer to only display at certain zoom levels, then use
> maxResolution (or maxScale, I would NOT mess with maxExtent for Google
> layers).
>
> Second,
> You do not need the RadioButton plugin (it has in fact been depricated). If
> you use "nodeType:'gx_baselayercontainer'", then it creates a tree loader
> that automatically creates the baseLayer nodes with a checkedGroup
> attribute. Any layerNode configured with a 'checkedGroup' will render with a
> radio button instead of a checkbox and interact with the other layerNodes
> that share the same 'checkedGroup' value.
>
> Third,
> It looks like your code is correct for the ZoomSlider & ZoomSliderTip. I
> think the issue is that you messed with the MAX_ZOOM_LEVEL & MIN_ZOOM_LEVEL
> constants.
>
> Matt Priour
> Kestrel Computer Consulting
>
>  *From:* Hugo <hfpmartins at gmail.com>
> *Sent:* Thursday, October 28, 2010 3:09 PM
> *To:* users at geoext.org
> *Subject:* [Users] LayerNodeUI and ZoomSlider
>
> Hello all,
>
> At the moment i'm facing two problems in my app. The first is related with
> baselayers from google in a tree with the RadioButton plugin. The thing is:
> if i define the baselayer node not to be expanded the layer is correctly
> displayed, however when i expand the base layer node i get a blank map and
> only after selecting a new baselayer things get drawn again. If instead i
> define the baselayer node to be expanded the layers are all shifted to the
> upper left corn of the mappanel but no blank map is being displayed as in
> the first option. I've just used the example tree.html to implement the
> treepanel.
>
> Is this a known problem or is there any other way to accomplish this? If i
> use a normal tree panel without the radiobutton plugin everything works
> fine... but obsviously i'm willing to get the radio button there. Any
> suggestions?
>
> My second problem, i have alreadey posted some days ago but got no
> feedback. I have a sacle combobox and a zoomslider control. When the app is
> loaded the scale shown in the combobox is different then the one on the
> zoomslider (1:6933504 vs 1:108336). If i drag it to increase zoom, nothing
> happens at the first time but from there it starts to make the zooms and the
> scale values are the same between the zoomslider and the scale combobox.
> However, i'm not able to zoom to the fullextent with the zoomslider anymore.
> I think this is related with my definitions on the zoom levels of google
> base layers. Here is my code:
>
> var gstreets = new OpenLayers.Layer.Google(
>                 "Google Streets",
>                 {MIN_ZOOM_LEVEL: 6, MAX_ZOOM_LEVEL: 20, 'type':
> G_NORMAL_MAP, 'sphericalMercator': true}
>  );
>  var gsat = new OpenLayers.Layer.Google(
>                 "Google Satellite",
>                 {MIN_ZOOM_LEVEL: 6, MAX_ZOOM_LEVEL: 20, 'type':
> G_SATELLITE_MAP, 'sphericalMercator': true}
>  );
>
>
> var mapPanel = new GeoExt.MapPanel({
>                 region: 'center',
>                 id: 'mappanel',
>                 height: 377,
>                 width: 500,
>                 map: map,
>                 tbar: [toolbar, zoomSelector],
>                 border: true,
>                 items: [{
>                     xtype: "gx_zoomslider",
>                     vertical: true,
>                     height: 100,
>                     x: 10,
>                     y: 20,
>                     plugins: new GeoExt.ZoomSliderTip({
>                         template: "<div> Escala: 1:{scale}</div><div>
> Resolução: {resolution}</div><div> ZOOM: {zoom}</div>"
>                     })
>                 }]
> });
>
> The scale combobox code is the same as the online example.
>
> Both these problems are not throwing any errors into the firebug console.
> Any help is more than appreciated ;)
> Thanks in advance,
>
> Hugo
>
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-- 
Hugo Martins
FMV-UTL
CIISA-Epidemiologia e Saúde Pública Veterinária
Av. da Universidade Técnica
1300-477 Lisboa
N 38°42'49.54", W 9°11'43.42"
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