How to Animate scrollpoint?

Question

- (void)mouseDragged:(NSEvent *)theEvent {
    NSSize dynamicImageSize;
    dynamicImageSize = [[self image] size];
    NSSize contentSize = [(NSScrollView*)[[self superview] superview] contentSize];
    if(dynamicImageSize.height > contentSize.height || dynamicImageSize.width > contentSize.width)
    {
        float x = startOrigin.x - ([theEvent locationInWindow].x - startPt.x);
        float y = startOrigin.y - ([theEvent locationInWindow].y - startPt.y);
        [self scrollPoint:NSMakePoint(x, y)];
    }
}

In the above code I need to animate the scrolling. How can I achieve this? Thanks.

Answer 1

You can create a subclass of NSAnimation to do this. I've created one as part of an open source project of mine (with public domain license).

You can find it here: https://github.com/abhibeckert/Dux/blob/master/Dux/DuxScrollViewAnimation.m (note: this project has ARC enabled. If you're not using ARC you will need to update as appropriate).

Example:

[DuxScrollViewAnimation animatedScrollToPoint:NSMakePoint(x,y) inScrollView:self.enclosingScrollView];

Answer 2

In my app, I set the clipView's boundsOrigin using its animator:

[NSAnimationContext beginGrouping];
NSClipView* clipView = [[myView enclosingScrollView] contentView];
NSPoint newOrigin = [clipView bounds].origin;
newOrigin.x = my_new_origin.x;
[[clipView animator] setBoundsOrigin:newOrigin];
[NSAnimationContext endGrouping];