我已经使用 Windows 用户组件 (user32.dll) 开发了一个 C# .NET WindowsForms 应用程序,该组件在每次用户更改焦点时保存活动窗口(具有焦点的窗口)的标题。
现在我打算在 Linux 上使用 Mono C# 来做同样的事情。可能吗?
如果是的话,我在找什么?
我决定看一下gnome-screenshot
具有这样功能的源代码(仅截取活动窗口的屏幕截图):
static GdkWindow *
screenshot_find_active_window (void)
{
GdkWindow *window;
GdkScreen *default_screen;
default_screen = gdk_screen_get_default ();
window = gdk_screen_get_active_window (default_screen);
return window;
}
当上面没有返回任何内容时,它有一些逻辑可以回退到“鼠标指针下的窗口”:
GdkWindow *
do_find_current_window (void)
{
GdkWindow *current_window;
GdkDeviceManager *manager;
GdkDevice *device;
current_window = screenshot_find_active_window ();
manager = gdk_display_get_device_manager (gdk_display_get_default ());
device = gdk_device_manager_get_client_pointer (manager);
/* If there's no active window, we fall back to returning the
* window that the cursor is in.
*/
if (!current_window)
current_window = gdk_device_get_window_at_position (device, NULL, NULL);
if (current_window)
{
if (screenshot_window_is_desktop (current_window))
/* if the current window is the desktop (e.g. nautilus), we
* return NULL, as getting the whole screen makes more sense.
*/
return NULL;
/* Once we have a window, we take the toplevel ancestor. */
current_window = gdk_window_get_toplevel (current_window);
}
return current_window;
}
据我所知,以上所有内容都依赖于 libgdk-pixbuf。如果这不是一个选项,您可以随时查看 Gdk 源代码中这些功能的实现。