如何填写NSScrollView的右下角？

Question

我想改变它的颜色，但我不确定是否继承了NSScrollView或NSClipView。或者如果角落可以作为常规NSView插入。

我不需要代码。只是暗示如何做到这一点。

Answer 1

mekentosj已经answered elsewhere on stackoverflow了。子类的类是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

Answer 2

有点奇怪，但只是继承NSScrollView并使用super.drawRect（）覆盖绘制使得我的NSScrollView（不是）用白色填充那个角落。我测试了它2倍以确保，因为它没有多大意义。

import Cocoa

class ThemedScrollView: NSScrollView {

    override func drawRect(dirtyRect: NSRect) {
        super.drawRect(dirtyRect)

        if hasVerticalScroller && hasHorizontalScroller {
            guard verticalScroller != nil && horizontalScroller != nil else { return }

            let vFrame = verticalScroller!.frame
            let hFrame = horizontalScroller!.frame
            let square = NSRect(origin: CGPoint(x: hFrame.maxX, y: vFrame.maxY), size: CGSize(width: vFrame.width, height: hFrame.height))

            let path = NSBezierPath(rect: square)
            let fillColor = NSColor.redColor()
            fillColor.set()
            path.fill()
        }
    }
}

以下是原始答案的Swift变体：

http.get('http://www.google.com/', function(response) {