Re: problems with live resize of NSTextView
Re: problems with live resize of NSTextView
- Subject: Re: problems with live resize of NSTextView
- From: Stuart Malin <email@hidden>
- Date: Sat, 25 Apr 2009 08:05:19 -1000
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).
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.
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