Thanks Matthew for the prompt reply. Just noticed the dot and the part
in the docs referring to the geometry management.
On 03/31/2011 05:58 PM, Matthew Flatt wrote:
> A plain `panel%' doesn't perform any geometry management of its
> children, and so `invisible-canvas' isn't moved and resized to f
A plain `panel%' doesn't perform any geometry management of its
children, and so `invisible-canvas' isn't moved and resized to fill the
frame. On my screen, I can see a little white dot where the canvas is 1
pixel by 1 pixel.
Normally, you want either `vertical-panel%' or `horizontal-panel%', or
y
Could someone please explain why there is an invisible canvas in this
example?
Env:
Linux 2.6.31-23-generic Ubuntu i686 GNU/Linux
racket 5.1.0.4
#lang racket
(require racket/gui)
(define bitmap-canvas%
(class canvas%
(init-field [bitmap #f])
(inherit get-dc)
(define/override (on-p
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