[Users] Tree node disabling with min/max scale

[Matt Priour]

The only issue I see with that is that checking / unchecking a layer will 
cause it to become visible or not and that in turn fires the 
'visibilitychanged' event which would now disable the layer node, preventing 
one from turning on that layer again

If you wanted to strictly tie the node disable/enable to the layer's 
'visibilitychanged' event then you would need to have some kind of flag that 
would prevent the node from disabling itself after a checkbox change event

Matt Priour

--------------------------------------------------
From: "Alexandre Dube" <adube at mapgears.com>
Sent: Thursday, October 21, 2010 10:51 AM
To: "Matt Priour" <mpriour at kestrelcomputer.com>
Cc: "Andreas Hocevar" <ahocevar at opengeo.org>; "GeoEXT Users" 
<users at geoext.org>
Subject: Re: [Users] Tree node disabling with min/max scale

> Hi,
>
>   Would it make sense to register a 'visibilitychanged' event inside the 
> LayerNode object and disable/enable the UI components accordingly ? 
> Having a plugin is nice but this seems like a feature everyone would like 
> to have by default.  Having to configure an additional plugin for that 
> could be avoided IMHO.
>
>   Using the 'visibilitychanged' event registration method, you trigger 
> much less events and you don't need to check each node on each map zoom. 
> Only when a layer would be actually changed the according event would 
> trigger only once and for the layer only.
>
>   What do you think ?  What do others think ?
>
> Alexandre
>
>
> On 10-10-21 11:44 AM, Matt Priour wrote:
>> My method is very similar to Pierre's.
>> I have a TreePanel plugin who's init function wires up event listeners to 
>> the map's zoom change event and async node expand event.
>>
>> it walks the tree and for each gx_layer type node it checks if the 
>> associated layer is in range.
>> If not then it disables the node and all of its children if any.
>> It also checks for any node that has all of its children disabled, and if 
>> so it also disables that node.
>>
>> I should have a working patch with test soon.
>>
>> Matt Priour
>>
>> --------------------------------------------------
>> From: "Alexandre Dube" <adube at mapgears.com>
>> Sent: Thursday, October 21, 2010 9:52 AM
>> To: "Matt Priour" <mpriour at kestrelcomputer.com>
>> Cc: "Andreas Hocevar" <ahocevar at opengeo.org>; "GeoEXT Users" 
>> <users at geoext.org>
>> Subject: Re: [Users] Tree node disabling with min/max scale
>>
>>> Hi Matt,
>>>
>>>   Nah, it's no "race" but I definitively need that feature soon, so I 
>>> rather share how I would have done it.
>>>
>>>   Ideally, I would have made a new "rangechange" event for the 
>>> OpenLayers.Layer object and listen to that event to disable/enable the 
>>> UI of the node accordingly.  Upon creation, a node would be disabled if 
>>> the 'inRange' is set to 'false' (unless it's a base layer).
>>>
>>>   That's pretty much it.  Does that make sense ?  How about your method 
>>> ?
>>>
>>> Alexandre
>>>
>>>
>>> On 10-10-21 10:29 AM, Matt Priour wrote:
>>>> "It's a race" ;)
>>>> I am working on implementing that feature today as well.
>>>>
>>>> Matt Priour
>>>> Kestrel Computer Consutling
>>>>
>>>>
>>>> --------------------------------------------------
>>>> From: "Alexandre Dube" <adube at mapgears.com>
>>>> Sent: Thursday, October 21, 2010 8:55 AM
>>>> To: "Andreas Hocevar" <ahocevar at opengeo.org>
>>>> Cc: "GeoEXT Users" <users at geoext.org>
>>>> Subject: Re: [Users] Tree node disabling with min/max scale
>>>>
>>>>> Got it.  I guess it shouldn't be that hard to implement, so I'll give 
>>>>> it
>>>>> a try and report back with a patch + ticket if it goes well.
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Alexandre
>>>>>
>>>>>
>>>>> On 10-10-21 09:39 AM, Andreas Hocevar wrote:
>>>>>> Hi,
>>>>>>
>>>>>> this would be a useful improvement, but it is not yet implemented - 
>>>>>> patches welcome!
>>>>>>
>>>>>> Regards,
>>>>>> Andreas.
>>>>>>
>>>>>> On Oct 21, 2010, at 15:30 , Alexandre Dube wrote:
>>>>>>
>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>>    The LayerSwitcher automatically disables its layer elements when
>>>>>>> zooming in/out following the min/max scale values of each layer.  Is
>>>>>>> that feature available with GeoExt tree nodes as well or do I need 
>>>>>>> to do
>>>>>>> that manually ?
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>> -- 
>>>>>>> Alexandre Dubé
>>>>>>> Mapgears
>>>>>>> www.mapgears.com
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Users mailing list
>>>>>>> Users at geoext.org
>>>>>>> http://www.geoext.org/cgi-bin/mailman/listinfo/users
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> -- 
>>>>> Alexandre Dubé
>>>>> Mapgears
>>>>> www.mapgears.com
>>>>>
>>>>> _______________________________________________
>>>>> Users mailing list
>>>>> Users at geoext.org
>>>>> http://www.geoext.org/cgi-bin/mailman/listinfo/users
>>>>>
>>>
>>>
>>> -- 
>>> Alexandre Dubé
>>> Mapgears
>>> www.mapgears.com
>>>
>>>
>
>
> -- 
> Alexandre Dubé
> Mapgears
> www.mapgears.com
>
>