Question

我正在尝试将窗口部分移出屏幕顶部。但是，在我完成移动后，Windows的默认行为会将其弹回。是的，我理解为什么存在这种特殊功能;但是，我仍然不希望它出现在我的窗户上。然后我注意到我可以使用SetWindowPos将一个窗口部分地设置在屏幕顶部，并且它不会弹回。例如，SetWindowPos(...., -100, -100, ....)会将我的窗口设置在屏幕上方100像素，它将保持在那里。

所以，不是正常移动我的窗口（比如发送SendMessage(hwnd, WM_SYSCOMMAND, SC_MOVE | 0x0002, 0);，我想使用SetWindowPos移动。我的想法是处理WM_MOUSEMOVE并检查鼠标左键是否关闭。如果鼠标左键按下，我会调用SetWindowPos对当前鼠标位置，之前的鼠标位置进行一些数学运算，并将其传递给SetWindowPos。

到目前为止，我有它工作，但不是很好。首先，如果鼠标快速移动，它根本不起作用。其次，当鼠标移动缓慢时，窗口会随着移动而摇晃。

这是我的WinProc：

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    static int lastMouseX = 0; 
    static int lastMouseY = 0; 
    switch (message)         /* handle the messages */
    {
    case WM_LBUTTONDOWN:
        lastMouseX = LOWORD(lParam); 
        lastMouseY = HIWORD(lParam); 
        break;
    //case WM_NCMOUSEMOVE: 
    case WM_MOUSEMOVE: 
        if(wParam == MK_LBUTTON)
        {
            int currentMouseX = LOWORD(lParam); 
            int currentMouseY = HIWORD(lParam); 
            int deltaX = currentMouseX - lastMouseX; 
            int deltaY = currentMouseY - lastMouseY; 
            RECT prc; 
            GetWindowRect(hwnd, &prc);
            SetWindowPos(hwnd, NULL, prc.left + deltaX, prc.top + deltaY, 0, 0, SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE);
            lastMouseX = currentMouseX; 
            lastMouseY = currentMouseY;
        }
        break; 
    case WM_DESTROY:
        PostQuitMessage (0);    /* send a WM_QUIT to the message queue */
        break;

    default:           /* for messages that we don't deal with */
        return DefWindowProc (hwnd, message, wParam, lParam);
    }

    return 0;
}

以下是完整代码http://pastebin.com/9A8iV5GW

进一步检查Windows消息，我确切地看到Windows将窗口向下移动的位置，但我仍然不知道我需要做什么。我知道它可以做到，因为我已经在其他应用程序中看到过它。

<--I stop moving here with WM_LBUTTONUP -->  
<windowMessage id="514" name="WM_LBUTTONUP">
  <wParam>0x00000000</wParam>
  <lParam>0x0049009E</lParam>
  <returnValue>0x00000000</returnValue>
<-- And here is when windows moves it back down -->  
</windowMessage><windowMessage id="534" name="WM_MOVING">
  <wParam>0x00000009</wParam>
  <lParam>0x003FF220</lParam>
  <returnValue>0x00000000</returnValue>
</windowMessage><windowMessage id="70" name="WM_WINDOWPOSCHANGING">
  <wParam>0x00000000</wParam>
  <lParam>0x003FEF98</lParam>
  <returnValue>0x00000000</returnValue>
</windowMessage><windowMessage id="36" name="WM_GETMINMAXINFO">
  <wParam>0x00000000</wParam>
  <lParam>0x003FEC20</lParam>
  <returnValue>0x00000000</returnValue>
</windowMessage><windowMessage id="71" name="WM_WINDOWPOSCHANGED">
  <wParam>0x00000000</wParam>
  <lParam>0x003FEF98</lParam>
  <returnValue>0x00000000</returnValue>
</windowMessage><windowMessage id="533" name="WM_CAPTURECHANGED">
  <wParam>0x00000000</wParam>
  <lParam>0x00000000</lParam>
  <returnValue>0x00000000</returnValue>
</windowMessage><windowMessage id="70" name="WM_WINDOWPOSCHANGING">
  <wParam>0x00000000</wParam>
  <lParam>0x003FF210</lParam>
  <returnValue>0x00000000</returnValue>
</windowMessage><windowMessage id="562" name="WM_EXITSIZEMOVE">
  <wParam>0x00000000</wParam>
  <lParam>0x00000000</lParam>
  <returnValue>0x00000000</returnValue>
</windowMessage>

Answer 1

这对我有用（使用捕获的窗口消息设计）：

    case WM_ENTERSIZEMOVE:
        in_movesize_loop = true;
        inhibit_movesize_loop = false;
        break;

    case WM_EXITSIZEMOVE:
        in_movesize_loop = false;
        inhibit_movesize_loop = false;
        break;  

    case WM_CAPTURECHANGED:
        inhibit_movesize_loop = in_movesize_loop;
        break;  

    case WM_WINDOWPOSCHANGING:
        if (inhibit_movesize_loop) {
            WINDOWPOS* wp = reinterpret_cast<WINDOWPOS*>(lParam);
            wp->flags |= SWP_NOMOVE;
            return 0;
        }
        break;

将窗口部分移出屏幕顶部

1 个答案: