Hello,
I'm implementing the Drag and Drop functionality over the same Custom View. My6
Custom is acting as source and Destination. I've implemented it according to
Apple's Guideline for Drag and Drop wit Custom Views. I've started the Drag and
Drop from mouseDown: event.
Normally it works fine, no issues. But sometimes performDragDropOperation:
doesn't get called, instead mouseUp event gets called.
In successful scenario(When drag and drop works fine) I never get call to
mouseUp: but when performDragDropOperation: doesn't get called I get the call
to mouseUp event.
I also observed that when mouseUp gets called after that call gets stuck in
draggingUpdated: - means draggingUpdated gets called repeatedly(I verified it
using console print messages) even if I hover over my Custom View. To finish
the drag and drop I have to click twice or thrice on view.
Following is the code for the same.
-(void)mouseDown:(NSEvent *)pTheEvent {
lastPoint = [pTheEvent locationInWindow];
NSPoint tvarMouseInWindow = [pTheEvent locationInWindow];
NSPoint tvarMouseInView = [self convertPoint:tvarMouseInWindow
fromView:nil];
NSSize zDragOffset = NSMakeSize(0.0, 0.0);
NSPasteboard *zPasteBoard;
zPasteBoard = [NSPasteboard pasteboardWithName:NSDragPboard];
[zPasteBoard declareTypes:[NSArray arrayWithObject:NSTIFFPboardType]
owner:self];
[zPasteBoard setData:[self.nsImageObj TIFFRepresentation]
forType:NSTIFFPboardType];
dragImage = [NSImage imageNamed:@"dragimage1"];
[self dragImage:dragImage
at:tvarMouseInView
offset:zDragOffset
event:pTheEvent
pasteboard:zPasteBoard
source:self
slideBack:YES];
return;
}
- (NSDragOperation)draggingEntered:(id )sender
{
return NSDragOperationMove;
}
- (BOOL)prepareForDragOperation:(id )sender {
return YES;
}
- (BOOL)performDragOperation:(id )sender {
NSPasteboard *zPasteboard = [sender draggingPasteboard];
self.nsImageObj = [[NSImage alloc] initWithPasteboard: zPasteboard];
return YES;
}
- (void)concludeDragOperation:(id )sender {
[self setNeedsDisplay:YES];
}
- (void)draggedImage:(NSImage *)image movedTo:(NSPoint)screenPoint
{
NSPoint pt = [[self window] convertScreenToBase:screenPoint];
lastPoint = [self convertPoint:pt fromView: nil];
dragImage = image;
[self setNeedsDisplay:YES];
}
-(void)mouseDragged:(NSEvent *)pTheEvent {
lastPoint = [pTheEvent locationInWindow];
[self setNeedsDisplay:YES];
} // end mouseDragged
-(void) mouseUp:(NSEvent *)theEvent
{
lastPoint = [theEvent locationInWindow];
[self setNeedsDisplay:YES];
}
- (BOOL)becomeFirstResponder
{
return YES;
}
Regards
Omkar
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