cocoa - 如何填充NSScrollView的右下角？

Question

我想改变它的颜色，但我不确定是否要继承 NSScrollView 或 NSClipView 的子类。或者是否可以将角作为常规 NSView 插入。

_{(来源:flickr.com)}

我不需要代码。只是提示如何操作。

Answer 1

已经answered elsewhere on stackoverflow作者:mekentosj。要子类化的类是 NSScrollView。

@interface MyScrollView : NSScrollView {
}
@end


@implementation MyScrollView

- (void)drawRect:(NSRect)rect{
    [super drawRect: rect];

    if([self hasVerticalScroller] && [self hasHorizontalScroller]){
        NSRect vframe = [[self verticalScroller]frame];
        NSRect hframe = [[self horizontalScroller]frame];
        NSRect corner;
        corner.origin.x = NSMaxX(hframe);
        corner.origin.y = NSMinY(hframe);
        corner.size.width = NSWidth(vframe);
        corner.size.height = NSHeight(hframe);

        // your custom drawing in the corner rect here
        [[NSColor redColor] set];
        NSRectFill(corner);
    }
}
@end