On Sep 13, 2011, at 06:12 PM, Andy Lee wrote:
> On Sep 13, 2011, at 12:49 PM, Martin Hewitson wrote:
>> So this almost provides the answer. I made a subclass and in there override
>> setRotationAngle:centerPoint: but this triggers for every mouse movement,
>> rather than for an accumulated drag from the user. I then tried to override
>> mouseUp with the plan to set a flag didRotate in
>> setRotationAngle:centerPoint: and then send a delegate message or
>> notification on mouseUp, then reset the flag. Unfortunately IKImageView
>> doesn't receive a mouseUp: when rotating. This works for moving the image,
>> but not rotating. So I guess for now I will try to live with the many
>> messages to the delegate, but I would have liked to quantise this at the
>> level of the user's action, so bracketed by mouseDown: and mouseUp:. If
>> anyone has any ideas how this might be achieved, I'd be happy to hear them.
>
> Sounds like mouseDown: implements its own drag loop when it detects that
> you're rotating the image. Test: if you override mouseDown: and do an NSLog,
> followed by super, followed by another NSLog, when does the second NSLog get
> called? Right way, or at the end of your drag?
>
ok, good clue. The second NSLog gets called when you stop the drag (so just
before mouse up). Still not sure I understand why mouseUp: is not called, but
this is probably enough for me to set some flags and implement some decent
delegate messages from my subclass. I'll post back the subclass when it's all
working.
Thanks again,
Martin
> If this theory is correct, you can set a flag in
> setRotationAngle:centerPoint: that says "the image was rotated" and check for
> that flag in mouseDown:. You might also need a flag in mouseDown: that says
> "the mouse is down, so henceforth any rotation of the image should be noted."
> Something like that.
>
> --Andy
>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Martin Hewitson
Albert-Einstein-Institut
Max-Planck-Institut fuer
Gravitationsphysik und Universitaet Hannover
Callinstr. 38, 30167 Hannover, Germany
Tel: +49-511-762-17121, Fax: +49-511-762-5861
E-Mail: martin.hewit...@aei.mpg.de
WWW: http://www.aei.mpg.de/~hewitson
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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