On Mon, Aug 10, 2009 at 3:50 PM, Colin McQuillan<m.ni...@googlemail.com> wrote:

>>  Colin: Do you know why the "getRegion" field of Window takes a Buffer 
>> parameter?
>>  There is only one buffer in the window...

> One BufferRef, but many FBuffers. In this case, I want to be able to
> tell if typing in a buffer has caused the cursor to go off the screen.
> Typing and scrolling doesn't change the Window but it does change the
> FBuffer.
>
> Or in other words, the geometry of a window is given by a function
> from text to layout information (in this case, the visible region).

I'm not sure that I follow yet.

I can see that changing the contents of the buffer should influence
the region which is displayed.
However, I thought that this region was recomputed after each refresh
(in the layout function), and therefore
an extra dependency is not needed.

Thanks,
JP.

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