How do I center an NSView within an NSScrollView like the way "Preview" does?
+4
A:
Read the Scroll View Programming Guide section on scrolling to a specific position. There are examples there for top or bottom. You'd just change the math to calculate the origin based on middle of your NSView. Something like:
-(void)scrollToCenter:(NSScrollView*)scrollView
{
const CGFloat midX = NSMidX([[scrollView documentView] bounds]);
const CGFloat midY = NSMidY([[scrollView documentView] bounds]);
const CGFloat halfWidth = NSWidth([[scrollView contentView] frame]) / 2.0;
const CGFloat halfHeight = NSHeight([[scrollView contentView] frame]) / 2.0;
NSPoint newOrigin;
if([[scrollView documentView] isFlipped])
{
newOrigin = NSMakePoint(midX - halfWidth, midY + halfHeight);
}
else
{
newOrigin = NSMakePoint(midX - halfWidth, midY - halfHeight);
}
[[scrollView documentView] scrollPoint:newOrigin];
}
nall
2009-11-21 00:40:25