[Drawkit] two views, different layers?

[James Maxwell]

oh, I actually wound up doing it in my DKToolController subclass'  
mouseDown, as I haven't subclassed DKDrawingView, at this point. (And  
I'm kind of trying not to!)
Does it make much difference to do it in the tool controller, rather  
than the view? What I've done seems okay, from the little bit of  
testing I've done, so far. I had to fudge around a bit to get changes  
across the layers to undo properly... or rather, to redraw the display  
properly after undoing. This seemed to be because objects on an  
inactive layer were getting undone, and weren't being told to redraw  
immediately after the undo... Anyway, I worked around it by enabling  
undo for selections, then receiving the selection change notification.  
 From the notification I just switch to the layer that registered the  
selection change. Seems to work, though maybe it's a bit brittle.

J.


On 29-Jul-08, at 6:05 PM, Graham Cox wrote:

> In your view's mouseDown: method, you can set the active layer "just  
> in time" then continue with normal processing. Switching the active  
> layer is usually a cheap process (as it's only changing a pointer  
> and sending a couple of notifications) so you're unlikely to run  
> into performance issues. And if the layer you want is already  
> active, DK does nothing, so you don't even need to test for it -  
> just set it and go.
>
> cheers, Graham
>
>
> On 30 Jul 2008, at 3:42 am, James Maxwell wrote:
>
>> Does anyone know if there's a built-in mechanism to set the active  
>> layer using the view? Since I have two object drawing layers which  
>> are intended to be exclusive to their own views, I'd like to be  
>> able to automatically set a given layer to "active" when mouse  
>> events are sent by a given view.
>> So, click view A --> activate layer A, click view B --> activate  
>> layer B.
>
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