See also BorderlessWindow

I’ve got a strange problem with a NSWindow subclass. I’m creating an odd-shaped window with a NSButton in it. You can click and drag successfully almost anywhere in the window. But, whenever I click and drag close to the edge of a button in the window, the window jumps.

Here’s the relevant portion of my code. Based on the transparent window code from the R**oundedFloatingPanel example on http://www.scotlandsoftware.com/products/source/

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//————————————————————————————

• (void)mouseDown:(NSEvent *)theEvent {
  NSRect windowFrame = [self frame];

  initialLocation = [NSEvent mouseLocation];

  initialLocation.x -= windowFrame.origin.x; initialLocation.y -= windowFrame.origin.y; }

//————————————————————————————

• (void)mouseDragged:(NSEvent *)theEvent { NSPoint currentLocation; NSPoint newOrigin;

  NSRect screenFrame = [[NSScreen mainScreen] frame]; NSRect windowFrame = [self frame];

  currentLocation = [NSEvent mouseLocation]; newOrigin.x = currentLocation.x - initialLocation.x; newOrigin.y = currentLocation.y - initialLocation.y;

  // Don’t let window get dragged up under the menu bar if( (newOrigin.y+windowFrame.size.height) > (screenFrame.origin.y+screenFrame.size.height) ){ newOrigin.y=screenFrame.origin.y + (screenFrame.size.height-windowFrame.size.height); }

  //go ahead and move the window to the new location [self setFrameOrigin:newOrigin]; }

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The solution is remove the code above, and use this instead:

[self setMovableByWindowBackground:YES];

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see also related discussion in NSTabViewWindowDraggingProblem