重新绘制使用-setClip方法在自定义视图上插入NSShadow [英] Redrawed inset NSShadow on a Custom View using -setClip method

问题描述

我有奇怪的问题，与这个问题的答案有关：

I have and odd problem, related with the answer of this question:

绘制插入NSShadow和插入笔触

我使用这个代码到drawRect方法中自定义视图。我有这样的：

I use this code into the drawRect method of a custom view. I have exactly this:

- (void)drawRect:(NSRect)rect
{   
    // Create and fill the shown path
    NSBezierPath *path = [NSBezierPath 
                          bezierPathWithRoundedRect:[self bounds] 
                          xRadius:4.0f 
                          yRadius:4.0f];

    [[NSColor colorWithCalibratedWhite:0.8f alpha:0.2f] set];

    [path fill];

    // Save the graphics state for shadow
    [NSGraphicsContext saveGraphicsState];

    // Set the shown path as the clip
    [path setClip];

    // Create and stroke the shadow
    NSShadow * shadow = [[[NSShadow alloc] init] autorelease];
    [shadow setShadowColor:[NSColor colorWithCalibratedWhite:0.0f alpha:0.8f]];
    [shadow setShadowBlurRadius:2.0];
    [shadow set];
    [path stroke];

    // Restore the graphics state
    [NSGraphicsContext restoreGraphicsState];

    if ( highlight && [[self window] firstResponder] == self ) {
        NSSetFocusRingStyle(NSFocusRingOnly);
        [[NSBezierPath bezierPathWithRect:[self bounds]] fill];
    }
}

问题出现在我添加一个多行标签兄弟姐妹或我的自定义视图的子项）。

The problem comes when I add a Multiline Label (either sibling or child of my custom view).

当我的程序窗口失去焦点，我回到它，我的内阴影/似乎阴影叠加。这很奇怪，因为如果我的窗口只有这个自定义视图，它会很好。

When my program window loses the focus and I come back to it, my inner shadow / stroke go darker. It seems that the shadows superimpose. It's strange because as said, if my window only have this custom view, it goes well.

如果我评论行

[path setClip]; 

阴影不再叠加，但我没有得到圆角的期望效果类似于NSBox）。

the shadow isn't superimposed anymore, but I don't get the desired effect of rounded corners (similar than NSBox).

我尝试使用按钮而不是多行标签发生了什么，通过失去/获取窗口焦点没有问题，但是当我

I tried what happens with a Push Button instead of a Multiline Label, and by losing / getting the window focus it has no problems, but when I click the button the shadow gets superimposed.

我发现问题与这里类似，但在Cocoa而不是Java：

I find the problem is similar than here, but in Cocoa instead of Java:

Java setClip似乎重绘

感谢您的帮助！

推荐答案

您不应该使用 -setClip ，除非你知道你在做什么。您应该使用 -addClip ，它尊重现有的剪切路径。

You should never use -setClip unless you know what you're doing. You should use -addClip instead, which respects the existing clipping paths.

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