Re: Application pane size: determining at run time

Robert STRANDH writes:

> bounding-rectangle).  But you can compute the bounding rectangle of
> the region by using the function bounding-rectangle*.
>
> A better choice would be to use window-viewport which returns the
> visible region of the application pane if it contained in a scroller
> pane, and the sheet region otherwise. 

Consider an application pane that displays some graphics. Its size is
initialized with the :WIDTH and :HEIGHT options, modulo window-manager
dependent constraints. At run time the user can dynamically change the
size of the application frame containing the pane, which in turn may
change the pane's size (or just the visible region?).

I would like the application-specific graphics to use all the space
available to the pane. So, the pane's display function needs to know
the current size in order to lay out the graphics. If I understand
correctly, WINDOW-VIEWPORT may be used for this if the pane is
contained in a scroller, SHEET-REGION + BOUNDING-RECTANGLE* otherwise.

Or maybe the display function can use all the space it wants, and the
scroller makes visible a possibly smaller part of the pane's graphics.


Paolo
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