X Keyboard focus mechanism and typical operation of modern toolkits

最新推荐文章于 2023-07-16 13:05:16 发布

原创最新推荐文章于 2023-07-16 13:05:16 发布 · 449 阅读

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文章标签：

#keyboard #events #input #manager #random

本文探讨了X窗口系统中键盘事件的传递机制及其与现代工具包之间的差异。X系统设计键盘事件传递方式时并未考虑现代工具包的典型操作，而是允许在没有窗口管理器或工具包内部焦点处理的情况下工作。通常情况下，键盘事件会发送给拥有X输入焦点的窗口，但如果鼠标指针位于焦点窗口内，则事件会被发送到焦点窗口下位于鼠标指针下方的子窗口。

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摘录自XEmbed Protocol Specification

The delivery of keyboard events in X is designed in a way that does not correspond to the typical operation of modern toolkits; instead it seems designed to allow things to allow things to work without either a window manager or a focus handling in the toolkit. Typically, key events are sent to the window which has the X input focus (set with XSetInputFocus()). However, if the mouse pointer is inside that focus window, the event is sent to the subwindow of the focus window that is under the moues pointer. In modern toolkits, the X input focus is typically left on the toplevel window and a separate logical input focus is implemented within the toolkit. The toolkit ignores the window that the key event is actually sent to (which might be a scrollbar or other random widget within the toplevel, depending on where the mouse pointer is), and distributes key events to widget with the logical input focus.