> -(void)mouseDragged:(NSEvent *)theEvent {
> NSPoint locationOnCanvas = [self convertPoint:[theEvent
> locationInWindow] fromView:nil];
>
> if(currentMouseMode == MMZooming) {
> * [self display]; //clear the previous "rectangle"
> [self lockFocus];
> [self drawRectUsingTwoPoints:lastMouseDownPos:locationOnCanvas];
> [self unlockFocus];
> [self displayIfNeeded]; //show the currect "rectangle"*
> }
> }
I suspect that the blinking is due to you drawing the selection rectangle in
the mouseDragged method, then calling display if needed, which (if needed) will
call drawRect:, which will presumably draw the view without the selection
rectangle
In the past I've implemented this by having the mouseDragged: method store the
rectangle in and NSRect ivar, then call setNeedsDisplay, and have the drawRect:
method draw the selection rectangle if the NSRect ivar has a valid value.
Jim
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