Question

我正在研究一个简单的Mac应用程序，可以检测外部屏幕何时拔出，保存所有窗口的位置，再次插入外部屏幕后，将所有窗口恢复到原始位置。（我知道那里已有应用程序，我只是很好奇这是怎么做的）

经过大量搜索后，我终于设法通过

获取所有窗口

NSArray *openWindows = [[NSWorkspace sharedWorkspace] runningApplications];
CFArrayRef windowList = CGWindowListCopyWindowInfo(kCGWindowListOptionOnScreenOnly, kCGNullWindowID);

这会返回类似

的内容

{
    kCGWindowAlpha = 1;
    kCGWindowBounds =         {
        Height = 22;
        Width = 279;
        X = 1559;
        Y = 0;
    };
    kCGWindowIsOnscreen = 1;
    kCGWindowLayer = 25;
    kCGWindowMemoryUsage = 13596;
    kCGWindowName = "";
    kCGWindowNumber = 18;
    kCGWindowOwnerName = SystemUIServer;
    kCGWindowOwnerPID = 260;
    kCGWindowSharingState = 1;
    kCGWindowStoreType = 2;
},
    {
    kCGWindowAlpha = 0;
    kCGWindowBounds =         {
        Height = 22;
        Width = 1920;
        X = 0;
        Y = 0;
    };
    kCGWindowIsOnscreen = 1;
    kCGWindowLayer = 25;
    kCGWindowMemoryUsage = 5404;
    kCGWindowNumber = 19;
    kCGWindowOwnerName = SystemUIServer;
    kCGWindowOwnerPID = 260;
    kCGWindowSharingState = 1;
    kCGWindowStoreType = 2;
},

然后我会遍历数组并查看每个单独的窗口

 for (int i = 0; i < CFArrayGetCount(windowList); i++) {
    CFDictionaryRef ref = CFArrayGetValueAtIndex(windowList, i);

    NSLog(@"%@", CFDictionaryGetValue(ref, kCGWindowBounds));
}

但这就是我遇到的问题，在使用多个屏幕时，我怎么能首先知道窗口在哪个屏幕上。其次，我怎样才能在以后调整窗口界限？每个应用程序都有自己的ID吗？或者我可以使用另一种方法吗？

Answer 1

由于CGWindowList API不公开屏幕ID，您必须根据屏幕边界检查窗口边界：

NSArray* windowList = (__bridge NSArray*)CGWindowListCopyWindowInfo(kCGWindowListOptionOnScreenOnly, kCGNullWindowID);
uint32_t maxDisplayCount = 10;
CGDirectDisplayID onlineDisplayIDs[maxDisplayCount];
uint32_t displayCount;
CGGetOnlineDisplayList(maxDisplayCount, (CGDirectDisplayID*)&onlineDisplayIDs, &displayCount);
for(uint32_t i = 0; i < displayCount; ++i)
{
    CGRect dspyRect = CGDisplayBounds(onlineDisplayIDs[i]);
    for(NSDictionary* windowDict in windowList)
    {
        CGRect windowRect;
        CGRectMakeWithDictionaryRepresentation((__bridge CFDictionaryRef)(windowDict[(id)kCGWindowBounds]), &windowRect);
        if(CGRectContainsRect(dspyRect, windowRect))
        {
            NSLog(@"window %@ is on screen with ID:%d", windowDict[(id)kCGWindowName], onlineDisplayIDs[i]);
        }
    }
}

上面的代码执行一个天真的检查，测试一个窗口是否完整在特定的屏幕上如果窗口的某个部分覆盖该屏幕，则OS X认为属于屏幕的窗口。（OS X版本之间的这种行为也略有改变）

要移动窗口，您可以使用Apple Events或Cocoa Accessibility APIs 请注意，Cocoa Accessibility要求您使用“系统偏好设置”中的“启用辅助设备访问” 启用App Sandboxing时，这两种技术都可能出现问题。

CGWindowListCopyWindowInfo：多个屏幕和更改属性

1 个答案: