Just when I think I've seen everything....
Code:
NSLog(@"myTextView is a %@", [myTextView class]) ;
NSLog(@"Before, its frame is: %@", NSStringFromRect([myTextView
frame])) ;
[myTextView setNeedsDisplay:YES] ;
NSLog(@" After, its frame is: %@", NSStringFromRect([myTextView
frame])) ;
Console Output:
myTextView is a NSTextView
Before, its frame is: {{17, 63}, {250, 75}}
After, its frame is: {{17, 123}, {250, 45}}
Why did -setNeedsDisplay: move my text view's y-origin up by 60 and
reduce its height by 30?
A possible answer [1] is that Cocoa does "not support" views
overlapping one another. Indeed, there are are sibling views that may
be overlapping at this point.
The code above is part of a method which "lays out" a window which I
create programatically. It is an enhanced NSAlert that, besides
having an icon, some text and three buttons, can have a progress bar,
editable text fields with labels, pulldown menus, checkbox, etc. I
use it for all of my alerts, errors, and more. However, since the
presence and size of all these subviews changes dynamically, I have
this method which, just prior to display, scans horizontally and then
vertically and sets all the frames. It's a handy class, and cool when
the layout works, which it does about 99% of the time. I inserted
that -setNeedsDisplay while troubleshooting one of the 1% cases and
WHOA the frame got whacked. I suspect that the same frame-whacking
mechanism is causing the actual problem I need to solve.
Also, I wonder if this is might be related to -[NSTextView
setNeedsDisplayInRect:avoidAdditionalLayout:]. But the documentation
seems to indicate that "layout" in this case has to do with word
positioning and line wrapping.
Nowhere can I find any documentation that setNeedsDisplay: should
whack an NSView's frame. This is all in Leopard, so it's not some old
long-fixed bug.
Jerry
[1] http://www.cocoabuilder.com/archive/message/cocoa/2006/10/17/172951
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