Thanks Keary,
It all makes sense. Deceptive is the word "below" in the reference guide,
which I usually interpret using the direction of gravity.
Philip
On Mar 13, 2012, at 1:49 PM, Keary Suska wrote:
> On Mar 13, 2012, at 8:55 AM, Grandinetti Philip wrote:
>
>> I'm running into a strange behavior with NSForm (and also NSMatrix).
>>
>> (1) Using interface builder (in Xcode 4.3.1) I place an NSForm in a window.
>> I add a NSButton and wire it to an IBAction that sends addRow to the NSForm.
>>
>> - (IBAction) addRow:(id)sender
>> {
>> [form addRow];
>> [form sizeToCells];
>> }
>>
>> The problem is that the new row is added ABOVE the existing row, not below
>> as it's supposed to. I thought this was a problem coming from somewhere else
>> in my app, but I created a new project in Xcode and this happens even in the
>> simplest app.
>>
>> I must be doing something stupid wrong, but I can't find it. Any suggestions
>> would be appreciated.
>
>
> It is a bit deceptive, but the problem is not what you think. The row is in
> fact added at the bottom, but when the view is resized it is sized from the
> bottom left corner, instead of the top left, which is intuitive for humanity
> but not apparently for the founders of Cocoa.
>
> To get the behavior you expect you need to either flip the coordinate system
> of the enclosing view or move the view back as such:
>
> - (IBAction) addRow:(id)sender
> {
> NSRect originalFrame = [form frame];
> [form addRow];
> [form sizeToCells];
> NSRect newFrame = [form frame];
> CGFloat delta = newFrame.size.height - originalFrame.size.height;
> newFrame.origin.y -= delta;
> [form setFrame:newFrame];
> }
>
> Note that -sizeToCells does not cause the view to be redrawn, so you will get
> drawing artifacts. You may use -selectTextAtIndex: to set focus on the new
> form field, which will avoid the drawing issues (maybe a little more
> functional than just calling -setNeedsDisplay:).
>
> HTH,
>
> Keary Suska
> Esoteritech, Inc.
> "Demystifying technology for your home or business"
>
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
