Screen damage logic

Bob Arning arning at
Thu Mar 23 02:52:37 UTC 2000

On Wed, 22 Mar 2000 17:59:57 -0800 "Jim Benson" <jb at> wrote:
>I'm still confused as to why this degenerates into calling the #drawOn: code
>endlessly. For example, with the round corners on, bring up the menu over
>the XXRM, wander the mouse away from the menu (beeping stops), then rest the
>mouse over the 'world' title. The beeps go nuts. I wouldn't think that you
>need to do this drawing much more than once ( well maybe several times
>depending on how you defined your occlusion region ), yet off it goes.
>Something tells me that it's not quite right.
>I'm concerned about this because the World menu is one of the focal points
>of interaction in a Morphic world, and having the menus feel slow detracts
>quite a bit from the overall experience. Plus rounded corners is the default
>menu look for Morphic in a clean image.

Here's the inside story:

All the noise gets generated by this sequence:

[] in PasteUpMorph>>doOneCycleNow

the problem being that MenuItemMorph>>isSelected: sends #changed even if it didn't really change. Here is a fix that seems to correct that:

'From Squeak2.8alpha of 13 January 2000 [latest update: #1919] on 22 March 2000 at 9:49:27 pm'!

!MenuItemMorph methodsFor: 'private' stamp: 'RAA 3/22/2000 21:48'!
isSelected: aBoolean

	isSelected == aBoolean ifTrue: [^self].
	isSelected _ aBoolean.
	self changed.
! !


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