TrackPopupMenu显示的系统菜单与窗口状态不匹配

问题描述：

在我的Qt应用程序中，我使用DwmExtendFrameIntoClientArea来扩展窗口内的Aero Glass，并且我处理了WM_NCCALCSIZE WinEvent以在非客户端区域绘制Qt小部件。TrackPopupMenu显示的系统菜单与窗口状态不匹配

另外，在我的应用程序中，我处理了WM_NCRBUTTONUP WinEvent，在窗口的客户区域内显示窗口系统（标题栏）菜单。例如：有时菜单起作用，我的意思是，我可以通过该菜单恢复，最大化，最小化和关闭窗口，但是，有时启用的菜单项与窗口的状态不匹配。不启用恢复，但启用已经最大化的窗口最大化，而我没有问题，通过Windows任务栏显示系统菜单

问题：我如何正确显示与当前窗口状态相匹配的菜单？基于我开发了下面的代码，解决我的问题Firefox的源代码

bool MainWindow::winEvent(MSG *msg, long *result) 
{ 
    HWND hWnd = msg->hwnd; 
    UINT message = msg->message; 
    WPARAM wParam = msg->wParam; 
    LPARAM lParam = msg->lParam; 

    bool retval = false; 
    LRESULT lRet = 0; 

    switch(message) 
    { 
    case WM_NCHITTEST: 
    { 
     lRet = HitTestNCA(hWnd, lParam); 
     DwmDefWindowProc(hWnd, message, wParam, lParam, &lRet); 
     retval = true; 
     break; 
    } 
    case WM_NCRBUTTONUP: 
    { 
     QPoint point = QCursor::pos(); 
     HMENU menu = GetSystemMenu(hWnd, FALSE); 
     BOOL Selected = TrackPopupMenu(menu, TPM_RIGHTBUTTON | TPM_NONOTIFY | TPM_RETURNCMD, point.x(), point.y(), 0, hWnd, NULL); 
     if(Selected) PostMessage(hWnd, WM_SYSCOMMAND, Selected, 0); 
     break; 
    } 
    case WM_NCCALCSIZE: 
    { 
     retval = true; 
     break; 
    } 
    default: 
     break; 
    } 

    *result = lRet; 

    if(retval) return true; 

    return QMainWindow::winEvent(msg, result); 
}

答

：

码听的WinEvents

HMENU hMenu = GetSystemMenu(hWnd, FALSE); 

if (hMenu) 
{ 
    MENUITEMINFO mii; 
    mii.cbSize = sizeof(MENUITEMINFO); 
    mii.fMask = MIIM_STATE; 
    mii.fType = 0; 

    // update the options 
    mii.fState = MF_ENABLED; 
    SetMenuItemInfo(hMenu, SC_RESTORE, FALSE, &mii); 
    SetMenuItemInfo(hMenu, SC_SIZE, FALSE, &mii); 
    SetMenuItemInfo(hMenu, SC_MOVE, FALSE, &mii); 
    SetMenuItemInfo(hMenu, SC_MAXIMIZE, FALSE, &mii); 
    SetMenuItemInfo(hMenu, SC_MINIMIZE, FALSE, &mii); 

    mii.fState = MF_GRAYED; 

    WINDOWPLACEMENT wp; 
    GetWindowPlacement(hWnd, &wp); 

    switch (wp.showCmd) 
    { 
    case SW_SHOWMAXIMIZED: 
     SetMenuItemInfo(hMenu, SC_SIZE, FALSE, &mii); 
     SetMenuItemInfo(hMenu, SC_MOVE, FALSE, &mii); 
     SetMenuItemInfo(hMenu, SC_MAXIMIZE, FALSE, &mii); 
     SetMenuDefaultItem(hMenu, SC_CLOSE, FALSE); 
     break; 
    case SW_SHOWMINIMIZED: 
     SetMenuItemInfo(hMenu, SC_MINIMIZE, FALSE, &mii); 
     SetMenuDefaultItem(hMenu, SC_RESTORE, FALSE); 
     break; 
    case SW_SHOWNORMAL: 
     SetMenuItemInfo(hMenu, SC_RESTORE, FALSE, &mii); 
     SetMenuDefaultItem(hMenu, SC_CLOSE, FALSE); 
     break; 
    } 

    LPARAM cmd = TrackPopupMenu(hMenu, (TPM_RIGHTBUTTON | TPM_NONOTIFY | TPM_RETURNCMD), 
           GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam), NULL, hWnd, NULL); 

    if (cmd) PostMessage(hWnd, WM_SYSCOMMAND, cmd, 0); 
}

显然，你需要手动设置启用和禁用物品。

TrackPopupMenu显示的系统菜单与窗口状态不匹配

相关推荐