On Apr 25, 2009, at 12:05 PM, Stuart Malin wrote:
On Apr 25, 2009, at 5:08 AM, Keary Suska wrote:
On Apr 24, 2009, at 3:06 PM, Stuart Malin wrote:
I have an NSTextView in a custom view, it is set to resize with
the containing view only in the horizontal dimension. When I
resize the window, the text view does resize, and it does re-
layout its content to fit, both on expanding and shrinking.
However, the text view not only changes its frame size height, but
repositions itself (changing the y value of its frame's origin).
Why does it do this?
You need to read the "Cocoa Drawing Guide" and "View Programming
Guide for Cocoa". The answer is explicit: the 0,0 coordinate of the
Cocoa drawing system is the bottom left.
Ah, I wasn't clear, because of course the origin would move down as
the text expands downward. What I am seeing though is that the
origin moves down more than the increase in height, so the text view
isn't just expanding, but expanding and moving downward (that is,
even its top moves down).
Is the NSTextView anchored to both the top and bottom edges? If not,
you may get this behavior.
More important to me: where is the best place for me to detect
this change because I want to change the parent view's height to
accommodate any increase in height in the text view.
One possible approach is to observe
NSViewFrameDidChangeNotification coming from the view. See the
NSView documentation for how to use it.
Thanks for reminding me of this. I need to see whether the
notification occurs before a redraw cycle. If so, I can propagate
relevant resizes up the chain of parent views.
It would probably be better to put the textview in a scrollview (or
make the textview's parent an NSScrollView subclass). You wouldn't,
for instance, want the window to grow larger than the screen size.
Best,
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
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