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Re: Weird behavior of mouse location when performing a drag
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Re: Weird behavior of mouse location when performing a drag


  • Subject: Re: Weird behavior of mouse location when performing a drag
  • From: Rob Keniger <email@hidden>
  • Date: Tue, 9 Dec 2008 08:26:19 +1000


On 09/12/2008, at 3:56 AM, Gustavo Pizano wrote:

Well Im performing a drag-ndrop between views of the same app, I implemented the - (NSDragOperation)draggingUpdated:(id < NSDraggingInfo >)sender method, because I need to know the location of the mouse so I can place the image in the correct position of the view. But weirdly after converting the point to the currentview there was a gap of about 145ox in x coordinate and 45 px in the y coord, those values are not even close to where the view resides in the window. So what I did to fix the problem was the following.

- (NSDragOperation)draggingUpdated:(id < NSDraggingInfo >)sender
{
	NSPoint converted = [NSEvent mouseLocation];
	actualDragPoint = [self convertPoint:converted fromView:nil];
	actualDragPoint.x = actualDragPoint.x - 144 ;
	actualDragPoint.y =  actualDragPoint.y -76;
	return NSDragOperationMove;
}

it fixed the problem, but Im wondering why is this happening?


[NSEvent mouseLocation] returns the location of the mouse in screen coordinates and you are treating it as if it is in Window coordinates.

You want the following:

- (NSDragOperation)draggingUpdated:(id < NSDraggingInfo >)sender
{
	NSPoint locationOnScreen = [NSEvent mouseLocation];
	actualDragPoint = [self convertPointFromBase: locationOnScreen];
	return NSDragOperationMove;
}

--
Rob Keniger



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References: 
 >Weird behavior of mouse location when performing a drag (From: Gustavo Pizano <email@hidden>)

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