Re: Dragging around an NSImageView
Re: Dragging around an NSImageView
- Subject: Re: Dragging around an NSImageView
- From: BJ Homer <email@hidden>
- Date: Fri, 3 Apr 2009 17:19:01 -0600
On Fri, Apr 3, 2009 at 9:54 AM, Randall Meadows <email@hidden>wrote:
> On Apr 3, 2009, at 4:14 AM, Aaron Scott wrote:
>
> I'm trying to figure out how to be able to drag an NSImageView around. The
>> NSImageView has been added as a subview to another NSImageView.
>>
>> Basically, I'm trying to drag a grey box around over the top of a picture.
>> I can programmatically move it around but I can't seem to find the right
>> code to allow me to drag it around.
>>
>
> You don't actually drag a *view*, you drag an image. Pedantic, perhaps,
> but important.
>
> When you start a drag, you specify the image that will be dragged. See
> NSView's -dragImage:at:offset:event:pasteboard:source:slideBack:, as well as
> "Dragging Sources" in the "Drag and Drop Programming Topics for Cocoa"
> reference.
>
That's true if you're trying to do drag-and-drop programming, but I don't
think the OP was trying to do that. I think he's basically trying to change
the frame of a subview. If that's the case, I think you'll want to look at
the documentation for -[NSResponder mouseDragged]. (Note that NSImageView
is a type of NSResponder.)
-BJ
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