如何在 Mac OS X 上绘制桌面? [英] How do I draw the desktop on Mac OS X?

问题描述

我想在 Mac OS X (Snow Leopard) 上绘制桌面.具体我想达到和运行一样的效果:

I want to draw the desktop on Mac OS X (Snow Leopard). Specifically, I want to achieve the same effect as running:

/System/Library/Frameworks/ScreenSaver.framework/Resources/
ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine -background

(如果您不在计算机附近，这会显示您通常会看到桌面背景的屏幕保护程序.)

(If you’re not near your computer, this displays the screensaver where you would normally see your desktop background.)

我知道如何制作没有边框的窗口(通过继承 NSWindow 并覆盖 initWithContentRect:styleMask:backing:defer: 将窗口样式设置为 NSBorderlessWindowMask)并且没有阴影(setHasShadow:NO.)

I know how to make a window without a border (by subclassing NSWindow and overriding initWithContentRect:styleMask:backing:defer: to set the window style to NSBorderlessWindowMask) and without a shadow (setHasShadow:NO.)

我知道我可以调用 setLevel:kCGDesktopWindowLevel 或 kCGDesktopIconWindowLevel 将我的窗口放在其他窗口下方(参见 question 418791.)但这并不是我想要的，因为这个级别的窗口仍然在桌面图标的顶部.我想在桌面背景之上，但在图标之下.

I know that I can call setLevel:kCGDesktopWindowLevel or kCGDesktopIconWindowLevel to put my window below other windows (see question 418791.) However this isn’t exactly what I want, because a window at this level is still on top of the desktop icons. I want to be on top of the desktop background, but below the icons.

我的观点是不透明的.如果有破坏桌面背景的技术就好了.

My view is opaque. If there is a technique that clobbers the desktop background, that is OK.

推荐答案

您应该创建一个 NSWindow 的子类，并将级别设置为 (kCGDesktopWindowLevel - 1).这将使您的窗口位于图标下方.您还应该确保您的窗口不会成为关键或主窗口，并且通过不动来正确处理 Exposé/Spaces.

You should create a subclass of NSWindow and set the level to (kCGDesktopWindowLevel - 1). This will get your window below the icons. You should also ensure that your window doesn't become key or main and that it handles Exposé/Spaces properly by not moving.

- (id)initWithContentRect:(NSRect)contentRect styleMask:(NSUInteger)windowStyle backing:(NSBackingStoreType)bufferingType defer:(BOOL)deferCreation
{
    self = [super initWithContentRect:contentRect styleMask:windowStyle backing:bufferingType defer:deferCreation];
    if(self)
    {
        [self setLevel:kCGDesktopWindowLevel - 1];
        [self setCollectionBehavior:
            (NSWindowCollectionBehaviorCanJoinAllSpaces | 
             NSWindowCollectionBehaviorStationary | 
             NSWindowCollectionBehaviorIgnoresCycle)];
    }
    return self;
}

- (BOOL)canBecomeMainWindow
{
    return false;
}

- (BOOL)canBecomeKeyWindow
{
    return false;
}

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