Radio buttons for baseLayers

[sypasche]

Use radio buttons to ensure only one base layer can be selected

[sypasche]

patch tree radio v0

[sypasche]

This extends some Ext objects to add radio button capability for base layers. At the same time, I have refactored things a bit. Internal variables that were just used inside _handleModelChange() are not properties of the tree object. These properties are structure for faster access to objects, which should be updated by calling _updateCachedObjects() when needed.

This refactoring makes it possible to share structures with other methods. I did this and fixed the _updateOrder() method which had not been updated for dealing with multiple layerNames per node (so drag/drop was broken in that case). I hope this refactoring should also make it better for implementing things like ticket:56.

Unit tests have been completed and updated for checking that the radio button is used correctly and I have run the tests on Firefox 3, Opera 9.5 and IE6.

[fredj]

r698 fix it. Thanks Sylvain

[bilok]

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