On Feb 15, 2007, at 7:04 PM, Tom Benson wrote:
I have a canvas subclass that draws itself based on the values of a
dictionary property.
These values could be changed at any time by any running part of my
application, so trying to trigger manual updates is a real
headache. At the moment I put everything in the paint event, but it
keeps refreshing and eats nearly half of my CPU...
So, what I want to do is create a separate property called
lastRenderHash and save the state of the dictionary each time I
render the image.
Then I put this in the paint event:
If me.dictionary.hash <> me.lastRenderHash then
Update
end
Any other ideas??
I found a really easy solution to this kind of thing recently.
Put a timer in the window. When you need "at least one" refresh, turn
the timer on. The timer has, say, a quarter-second period, after
which it causes the refresh.
Whether one or fifty events require the refresh, once it's on, it's
on... :-)
Regards,
Guyren G Howe
Relevant Logic LLC
guyren-at-relevantlogic.com ~ http://relevantlogic.com
REALbasic, PHP, Ruby/Rails, Python programming
PostgreSQL, MySQL database design and consulting
Technical writing and training
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