windows 使非客户区无效
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Invalidating non-client areas
提问by Ismael
I've a window which has custom border/caption, in order to do that I handle WM_NCPAINT message. My caption has two backgrounds a brighter one for the active window, and a darker one for the background window.
我有一个具有自定义边框/标题的窗口，为了做到这一点，我处理 WM_NCPAINT 消息。我的标题有两种背景，一种较亮的用于活动窗口，一种较暗的用于背景窗口。
But under some circumstances, for example when the window loses/gain focus, my caption is not updated so I end with the wrong background.
但在某些情况下，例如当窗口失去/获得焦点时，我的标题没有更新，所以我以错误的背景结束。
Until now I've handled WM_NCACTIVATE, and send a RedrawWindow(hwnd, NULL, NULL, RDW_FRAME|RDW_INVALIDATE), but this causes the whole window to repaint. Do you have any advice about this?
到目前为止，我已经处理了 WM_NCACTIVATE，并发送了一个 RedrawWindow(hwnd, NULL, NULL, RDW_FRAME|RDW_INVALIDATE)，但这会导致整个窗口重新绘制。你对此有什么建议吗？
采纳答案by Adrian McCarthy
Overriding non-client area is always fraught with peril. It seems the Window manager makes a lot of assumptions for optimization. Clearly it canbe done, see Office, but it might take a lot of experimentation.
覆盖非客户区总是充满危险。窗口管理器似乎对优化做了很多假设。显然可以做到，请参阅 Office，但可能需要进行大量实验。
Just an idea. Call RedrawWindow twice, once to invalidate the non-client area then again to validate the client area.
只是一个想法。调用 RedrawWindow 两次，一次使非客户区无效，然后再次使客户区无效。
RedrawWindow(hwnd, NULL, NULL, RDW_FRAME | RDW_INVALIDATE);
RedrawWidnow(hwnd, NULL, NULL, RDW_NOFRAME | RDW_VALIDATE);
Another idea is to try to paint just the frame immediately, without invalidating anything:
另一个想法是尝试立即绘制框架，而不会使任何内容无效：
RedrawWindow(hwnd, NULL, NULL, RDW_FRAME | RDW_UPDATENOW | RDW_NOCHILDREN);
Yet another idea is to specify an empty RECT or HREGION in the 2nd or 3rd parameters. It might not invalidate the client area that way.
另一个想法是在第二个或第三个参数中指定一个空的 RECT 或 HREGION。它可能不会以这种方式使客户区无效。
回答by thims
Actually, this does the trick:
实际上，这可以解决问题：
SetWindowPos(hwnd, 0, 0, 0, 0, 0,
SWP_DRAWFRAME|SWP_NOMOVE|SWP_NOSIZE|SWP_NOACTIVATE|SWP_NOZORDER);
