Hi,
I am trying to emulate a scrolling behavior within a NSView.
I am calling scrollRect:by: and as the documentation specifies:
------------------
Discussion
This method is useful during scrolling or translation of the coordinate system
to efficiently move as much of the receiver’s rendered image as possible
without requiring it to be redrawn, following these steps:
• Invoke scrollRect:by: to copy the rendered image.
• Move the view object’s origin or scroll it within its superview.
• Calculate the newly exposed rectangles and invoke either
setNeedsDisplay: or setNeedsDisplayInRect: to draw them.
You should rarely need to use this method, however. The scrollPoint:,
scrollRectToVisible:, and autoscroll: methods automatically perform optimized
scrolling.
(cf.
http://developer.apple.com/mac/library/documentation/Cocoa/Reference/ApplicationKit/Classes/NSView_Class/Reference/NSView.html
)
------------------
The scrolling (step 1) looks fine but I don't really get how to set the origin.
My goal is to only redraw the updated areas (top or bottom).
I use Quartz Debug to visualize the updated areas.
I tried using setBounds: but it redraws everything.
A small project can be found here:
http://files.me.com/ffreling/4oa6n8
(I set the NSImageView to an image from my desktop for the example, you can
remove it or set it to another image if you want)
Any help would be appreciate :)
Thank you.
Best regards,
--
Fabien Freling
Software Engineer, Platform team
Nokia, Qt Development Frameworks
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