c++ - 单击时系统托盘如何跟踪菜单的状态？

Question

我有一个系统托盘，我想在单击时跟踪菜单。例如，当在系统托盘上单击鼠标右键时，我使用 InsertMenu(hPopMenu,0xFFFFFFFF,uFlag,IDM_AUTO,_T("Auto")); 但它总是覆盖我的更改？如何跟踪用户点击了哪个菜单？这是我的回调函数:

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    POINT lpClickPoint;
    HMENU hMenu;    // handle to main menu 
    MENUITEMINFO mii = {sizeof(MENUITEMINFO) };
    BOOL status;

    switch (message)
    {
        case WM_USER_SHELLICON: 

            // systray msg callback 
            switch(LOWORD(lParam)) 
            {   
                case WM_RBUTTONDOWN: 

                    UINT uFlag = MF_BYPOSITION|MF_UNCHECKED|MF_STRING;
                    GetCursorPos(&lpClickPoint);
                    hPopMenu = CreatePopupMenu();

                                InsertMenu(hPopMenu,0xFFFFFFFF,uFlag,IDM_AUTO,_T("Auto")); InsertMenu(hPopMenu,0xFFFFFFFF,MF_SEPARATOR,IDM_SEP,_T("SEP"));                                  
InsertMenu(hPopMenu,0xFFFFFFFF,MF_BYPOSITION|MF_STRING,IDM_EXIT,_T("Exit"));

                    SetForegroundWindow(hWnd);
                    TrackPopupMenu(hPopMenu,TPM_LEFTALIGN|TPM_LEFTBUTTON|TPM_BOTTOMALIGN,lpClickPoint.x, lpClickPoint.y,0,hWnd,NULL);
                    return TRUE; 
            }
            break;

    case WM_COMMAND:

        wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);

        // Parse the menu selections:


               ...
               ...

    }
    break;

    case WM_DESTROY:
        PostQuitMessage(0);
        break;

    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

Answer 1

您正在重新创建每一次鼠标点击。因此，您必须根据当前状态进行初始化。

UINT uFlag = MF_BYPOSITION|MF_UNCHECKED|MF_STRING;

变成:

UINT uFlag;
if( bCheckboxShouldBeCheckedAccordingToYourApplication )
    uFlag = MF_BYPOSITION|MF_CHECKED|MF_STRING;
else
    uFlag = MF_BYPOSITION|MF_UNCHECKED|MF_STRING;

这里，现在它更短了，但实际上仍然符合提出的问题:

UINT uFlag = MF_BYPOSITION  | (b?8:0) | MF_STRING;

当然，它的可读性差了一点。