Re: [udig-devel] Updates to the ViewportPane Interface

[Jody Garnett <jgarnett@xxxxxxxxxxxxxxx>]

I had a review over Emily's work; and asked her to move the 
viewportpane.isPanning() method into a viewportmodel.isBoundsChanging() 
method.

The idea is that her RenderManager can make a different choice about 
what tiles to fetch when
getting a bounds event based on this isBoundsChanging() method.

My understanding is that Emily will just check for new tiles when 
isBoundsChanging() is true.

For reference we considered:
- a pre/post event split - similar to how ISelectionService has 
addSelectionChanged and addPostSelectionChange methods (in order to 
handle a similar issue when keys or mouse clicks are used to change the 
selection in a list)
- BoundedRangeModel (from JSlider) which uses a isModelAdjusting flag

Cheers,
Jody

Emily Gouge wrote:
> I'm working on a new pan tool that uses the scroll functionality of 
> the canvas to provide a smoother user experience and allow for new 
> tiles to be drawn on the screen as you pan (if you are using the tiled 
> rendering system).
>
> In order to do this I need to make a few additions to the ViewportPane 
> Interface.  The function additions are all related to panning and 
> allow the viewport pane to know if it is being panned and perform 
> specific updates when it is panned.
>
> Can somebody review before I commit these changes?
>
> Emily
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