拖动客户区就能拖动整个窗口

最新推荐文章于 2019-05-10 19:12:25 发布

原创最新推荐文章于 2019-05-10 19:12:25 发布 · 1.2k 阅读

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本文介绍了一种通过处理WM_NCHITTEST消息使窗口能够通过其客户端区域进行拖动的方法。这种方法可以让没有标题栏的窗口也能被拖动，并且只允许通过客户端区域拖动窗口，避免干扰窗口边框的正常使用。

Dragging a window by its client area

The simplest way to drag a window by its client area (or drag a window if it has no title bar), is to handle the WM_NCHITTEST message that is sent to every window when a mouse event occurs.
By returning a value of HTCAPTION from the WM_NCHITTEST message handler, you can fool windows into thinking that the mouse is over a caption bar, and the window can be dragged around with the mouse. It is best to only allow dragging by the client area of a window - otherwise, the window borders would become unusable. To achieve this, call the default window procedure, and check if its return value is HTCLIENT - if it is, then return HTCAPTION instead. Otherwise, just let the default behaviour take place.

UINT uHitTest;
...
case WM_NCHITTEST:
    uHitTest = DefWindowProc(hwnd, WM_NCHITTEST, wParam, lParam);
    if(uHitTest == HTCLIENT)
        return HTCAPTION;
    else
        return uHitTest;