如何在OS X桌面上制作全屏幕叠加？ [英] How can I make a fullscreen overlay on the OS X desktop?

问题描述

我想创建一种可绘制的表面，它存在于鼠标光标下方，但高于一切在桌面上渲染的表面。我试图在鼠标后面创建一个踪迹。

我如何在Cocoa和Objective-C中做这个？

NSWindow 子类化以创建无边框窗口，并将其窗口级别设置为 NSScreenSaverWindowLevel - 1 。

   - （id）initWithContentRect：（NSRect）contentRect 
 styleMask：（NSUInteger）aStyle 
 backing：（NSBackingStoreType）bufferingType 
 defer：（BOOL）flag 
 {
 self = [super initWithContentRect：contentRect 
 styleMask：NSBorderlessWindowMask 
 backing：bufferingType 
 defer：flag]; 
 
 if（self！= nil）
 {
 [self setHasShadow：NO]; 
 [self setOpaque：NO]; 
 [self setBackgroundColor：[NSColor clearColor]]; 
 [self setLevel：NSScreenSaverWindowLevel  -  1]; 
} 
 return self; 
} 
  

I want to make some kind of drawable surface that exists beneath the mouse cursor but above everything else rendered on the desktop. I am trying to create a "trail" behind the mouse.

How can I do this in Cocoa and Objective-C?

解决方案

You need to subclass NSWindow to create a borderless window and set its window level to something like NSScreenSaverWindowLevel - 1.

- (id)initWithContentRect:(NSRect)contentRect 
                styleMask:(NSUInteger)aStyle
                  backing:(NSBackingStoreType)bufferingType
                    defer:(BOOL)flag
{
    self=[super initWithContentRect:contentRect 
                          styleMask:NSBorderlessWindowMask 
                            backing:bufferingType
                              defer:flag];

    if(self!=nil)
    {
        [self setHasShadow:NO];
        [self setOpaque:NO];
        [self setBackgroundColor:[NSColor clearColor]];
        [self setLevel:NSScreenSaverWindowLevel - 1];
    }
    return self;
}

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