[OpenLayers-Dev] Rearranging stack order of layers

[Tim-Hinnerk Heuer]

How about a function/extension to OpenLayers that does this?

//===========================

OpenLayers.Map.prototype.swapLayers = function(firstLayer, secondLayer) {
  var delta = this.getNumLayers() - 2;
  map.raiseLayer(secondLayer, -delta);
  map.raiseLayer(firstLayer, delta);
}

// in your code you would then call:
map.addLayer(layer_e); // if you haven't done so already
map.swapLayers(layer_b, layer_e);

//===========================

Haven't tested this but believe it works assuming the code below works.

Cheers,
Tim

Tim-Hinnerk Heuer

Twitter: @geekdenz
Blog: http://www.thheuer.com



On 10 August 2012 21:29, Jason Lee <jaslee.st at gmail.com> wrote:

> Oops, let's make that example more generic(!)
>
> //===========================
> lyrNum = 2;
> var delta = map.getNumLayers() - lyrNum;
>
> map.raiseLayer(layer_e, -delta);
> map.raiseLayer(layer_b, delta);
> //===========================
>
> Jason
>
>
> On Fri, Aug 10, 2012 at 10:26 AM, Jason Lee <jaslee.st at gmail.com> wrote:
>
>> Don't know if it is the best solution, but I am now using
>> "map.raiseLayer()" like so:-
>>
>> //===========================
>> lyrNum = 2;
>> var delta = map.getNumLayers() - lyrNum;
>>
>> map.raiseLayer(layer, -delta);
>> map.raiseLayer(netLayer, delta);
>> //===========================
>>
>> This seems to do the trick.
>>
>> Jason
>>
>>
>> On Fri, Aug 10, 2012 at 9:55 AM, Jason Lee <jaslee.st at gmail.com> wrote:
>>
>>> Hi,
>>> I have an OpenLayers application which initially has 4 layers, called
>>> (a),(b),(c) & (d). The app then allows the creation of a new layer (e)
>>> which I want it to "swap" places with layer (b) so that the order should be
>>> (a),(e),(c),(d),(b).
>>>
>>> I use the map.setLayerIndex and layer.getZIndex to try and do this but I
>>> realise that the layers are in a FIFO like queue, so when I temporarily
>>> re-assign layer (b) the other layers automatically reorder themselves to
>>> (a),(c),(d),(e) ...or at least that's what I think it happening.
>>>
>>> Could anyone show me how I can simply swap the z-order of 2 layers?
>>>
>>> Thanks
>>>
>>> Jason
>>>
>>
>>
>
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