At Thu, 23 Feb 2017 10:09:59 +0000, Erich Rast wrote:
> I have an editor-canvas A subclasses inside a vertical-panel subclass B
> and below A there is another vertical-panel subclass C in B. C is shown
> or hidden by removing and adding it via change-children in B.
>
> However, even though A has stretchable-height set to #t, it does not
> resize to fill the whole area of B automatically when the C is removed.
> (C itself is not stretchable-height.)
>
> I tried refresh but it didn't have any visible effect and on-size does
> nothing by default. Is there a way to programmatically trigger the same
> size calculation and display adjustment as when the panels/canvases are
> created? Or do I have to do this manually?
Does the editor canvas in the example below stretch when the button
removes its parent vertical panel? (If not, you're seeing a bug...)
If so, is there a change that makes it behave like your program?
----------------------------------------
#lang racket/gui
(define f (new frame% [label "Stretch"]))
(define B (new vertical-panel%
[parent f]))
(define A (new editor-canvas%
[parent B]))
(define C (new vertical-panel%
[parent B]))
(void
(new button%
[parent C]
[label "Remove Me"]
[callback (lambda (c e)
(send B change-children (lambda (l) (list A))))]))
(send f show #t)
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