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我有以下NSScroller子类,创建具有圆形白色旋钮滚动条和没有箭头/槽(背景):NSScroller故障的图形/滞后
@implementation IGScrollerVertical
- (void)drawKnob
{
NSRect knobRect = [self rectForPart:NSScrollerKnob];
NSRect newRect = NSMakeRect(knobRect.origin.x, knobRect.origin.y, knobRect.size.width - 4, knobRect.size.height);
NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect:newRect xRadius:7 yRadius:7];
[[NSColor whiteColor] set];
[path fill];
}
- (void)drawArrow:(NSScrollerArrow)arrow highlightPart:(int)flag
{
// We don't want arrows
}
- (void)drawKnobSlotInRect:(NSRect)rect highlight:(BOOL)highlight
{
// Don't want a knob background
}
@end
这一切都工作正常,但有一个noticable当我使用滚轮时会滞后。看到这段视频:
我很困惑,我在做什么错了,有什么建议?