Hi People,
I am learning how to use a little core animation to make my user
interface look cooler, but I am stuck with the following problem:
I use a disclosure button do expand/contract a custom view which, in
turn, is used to display an open bez-path. In the view's drawRect: I
stroke the path with a 2 point line-width. The points are calculated
based on the view's geometry so that it plots the curve over a wider
area when the view is larger, but allways with the same line thickness.
I want to use the basic, built-in NSView core animation stuff to make
the frame-change be smooth. That is all, and it works ok except that,
since the image is cached, the once crisp 2.0 point line becomes a
blurred thicker contour as the view expands. (note: drawing works
perfectly without using the animator).
1) Animation code is bellow (VERSION A) -- Is there a way to make
core animation query my view whenever the rect changes so that it can
redraw itself correctly? (Obviously CA's caching is very useful and
much more efficient, but in my case it produces undesired results...)
Or am I doing it all wrong?
2) alternatively I tried recalling the rect change without the
animator, after the animation grouping (VERSION B), so that, at least,
after the animation I could have a correctly rendered view. Instead of
that, it seemed to be doing the entire animation with the desired
drawing, but produced a horrible glitch at the begining of the
animation. I can't really live with this glitch (it is so ugly it
defeats the purpose of using animation...),. It seems like the view
flashes in the new size because of the second call to setFrame and
then the animation kicks in assyncronously, resets the view size and
starts expanding the view. Slowing down the animation, I can see there
is an ilusion of the drawing being correct because the view is already
set to the target size.
Hope this is not too confusing. I would really appreciate any
suggetions on how to do this right.
Carlos.
// VERSION A =======================
- (IBAction)resizeMyView:(id)sender
{
switch([sender state])
{
case NSOffState:
{
NSRect newFrame = NSMakeRect(20, 30, 760, 567);
[NSAnimationContext beginGrouping];
[[NSAnimationContext currentContext] setDuration:0.5];
[[myView animator] setFrame: newFrame];
[myView setNeedsDisplay:YES];
[NSAnimationContext endGrouping];
break;
}
case NSOnState:
{
NSRect oldFrame = NSMakeRect(20, 30, 760, 130);
[NSAnimationContext beginGrouping];
[[NSAnimationContext currentContext] setDuration:0.5];
[[myView animator] setFrame:oldFrame];
[myView setNeedsDisplay:YES];
[NSAnimationContext endGrouping];
break;
}
}
}
// VERSION B =======================
- (IBAction)resizeMyView:(id)sender
{
switch([sender state])
{
case NSOffState:
{
NSRect newFrame = [self createRectWithX:20 y:30 w:760
h:567];
[NSAnimationContext beginGrouping];
[[NSAnimationContext currentContext] setDuration:0.5];
[[myView animator] setFrame:newFrame];
[myView setNeedsDisplay:YES];
[NSAnimationContext endGrouping];
[myView setFrame:newFrame];
[myView setNeedsDisplay:YES];
break;
}
case NSOnState:
{
NSRect oldFrame = [self createRectWithX:20 y:30 w:760
h:130];
[NSAnimationContext beginGrouping];
[[NSAnimationContext currentContext] setDuration:0.5];
[[myView animator] setFrame:oldFrame];
[myView setNeedsDisplay:YES];
[NSAnimationContext endGrouping];
[myView setFrame:oldFrame];
[myView setNeedsDisplay:YES];
break;
}
}
}
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