Re: NSView / Drag and Drop: Any API or constants to detect the start of a drag?
Re: NSView / Drag and Drop: Any API or constants to detect the start of a drag?
- Subject: Re: NSView / Drag and Drop: Any API or constants to detect the start of a drag?
- From: Stéphane Sudre <email@hidden>
- Date: Sat, 10 Nov 2007 14:10:33 +0100
On samedi, novembre 10, 2007, at 02:02 PM, John C. Randolph wrote:
On Nov 10, 2007, at 2:48 AM, Stéphane Sudre wrote:
Unfortunately, I had a look at this method during my search.
There's no "magnetism" with this call : you get the message as soon
as the mouse moved from 1 pixel.
Stephane,
What we typically do in a Cocoa app for the behavior you describe is
to save the location of the mouseDown event, and compare it to the
location of a mouseDragged event. If the distance is greater than
whatever threshold you want, then you go ahead and send a
-dragFile:... or -dragImage:... type of message.
In some cases, drag and drop is chosen by a modifier key, and in those
situations, you probably want to go ahead and initiate the dragging
session without caring how far the cursor has moved.
That's somehow what I fear from a user experience point of view.
Since there does not seem to be a method or constant to define the
threshold, we end up with having different thresholds; not only within
Cocoa apps but also between Cocoa and Carbon apps.
I guess the idea is to file an enhancement request so that we can
eventually get a constant in 2010.
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