C ++ Win32静态控件透明背景

debugcn 发表于 Dev

埃文·卡斯雷克（Evan Carslake）

解决方案：如下所述，最好为文本创建您自己的方法，而不是尝试使控件表现异常。因此，为此创建一个自定义控件将是最好的。我找到了一个说明所有内容的教程：http : //www.codeproject.com/Articles/559385/Custom-Controls-in-Win-API-The-Basics。

有人问过，虽然没有实际的解决方案。

我正在尝试使用静态控件来显示文本，因此更新就像发送消息一样容易。我可以很容易地刮擦控件，并只使用普通的DrawText（），但这似乎是一个“草率的”解决方案。

这是所有者绘制方法。

else if (message == WM_DRAWITEM) {  
    LPDRAWITEMSTRUCT pDIS;
    pDIS = (LPDRAWITEMSTRUCT)lParam;
    RECT rc;

    SetTextColor(pDIS->hDC, RGB(200,10,60));
    SelectObject(pDIS->hDC, (HPEN)GetStockObject(NULL_PEN));
    SelectObject(pDIS->hDC, (HBRUSH)GetStockObject(NULL_BRUSH));
    SetBkMode(pDIS->hDC, TRANSPARENT);
    // Start Drawing
    Rectangle(pDIS->hDC, 0, 0, pDIS->rcItem.right+1, pDIS->rcItem.bottom+1);
    DrawText(pDIS->hDC, "teststring", 10, &pDIS->rcItem, 0); 

    return 0;
}

我得到： static_controls

左边是我得到的，右边是我想要的。

CreateWindow("STATIC", "teststring", WS_CHILD | WS_VISIBLE | SS_OWNERDRAW, 20, 20, 120, 40, hwnd, (HMENU)(IDC_STATIC_TEST), GetModuleHandle(NULL), NULL);

那就是我用来创建静态的东西。

我已经花了4个多小时不停地尝试这样做，我已经尝试了一切。

任何帮助表示赞赏。

最好只忘记静态控件，而只使用DrawText（）更好。

谢谢。

// create window
hwnd = CreateWindowEx (0, szClassName, "Test Transparent Static Main Window", WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX , 100, 100, 300, 200, HWND_DESKTOP, NULL, hThisInstance, NULL);         
ShowWindow (hwnd, nFunsterStil);
// set globals
hWnd = hwnd;
hInstance = hThisInstance;

// main window message loop
while (GetMessage (&messages, NULL, 0, 0)) {
    TranslateMessage(&messages);
    DispatchMessage(&messages);
}
return messages.wParam;
}






// Main Window Procedure
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
// local variables
PAINTSTRUCT ps;
HDC hdc;    


switch (message) {

    case WM_CREATE:   
        {     
        LRESULT lRes = DefWindowProc(hwnd, message, wParam, lParam);
        HWND hWndStatic = CreateWindowEx(0, "Static", NULL, WS_CHILD | WS_VISIBLE, 10, 10, 200, 100, hwnd, NULL, hInstance, NULL);
        StaticWndProc = (WNDPROC)SetWindowLong(hWndStatic, GWL_WNDPROC, (LPARAM)MyStaticWndProc);
        return lRes;            
        }
        break;

    case WM_PAINT: 
        hdc = BeginPaint(hwnd, &ps); 
        SetBkMode(hdc, TRANSPARENT);
        SetBkColor(hdc, RGB(110,110,110));
        EndPaint(hwnd, &ps);
        break;

   case WM_DESTROY:
        PostQuitMessage(0);       
        break;

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







LRESULT CALLBACK MyStaticWndProc(HWND hwnd, UINT Message, WPARAM wparam, LPARAM lparam)     {   

if (Message == WM_PAINT) {   
    RECT rc;
    PAINTSTRUCT ps;
    HDC hdc = BeginPaint(hwnd, &ps);

    GetClientRect(hwnd, &rc);
    SetBkMode(hdc, TRANSPARENT);
    SetTextColor(hdc, RGB(0,100,200));
    DrawText(hdc, "TESTTEXT", 8, &rc, DT_CENTER | DT_VCENTER | SS_LEFT);

    EndPaint(hwnd, &ps);

    return 0;
}

return StaticWndProc(hwnd, Message, wparam, lparam);
}

- - - - -编辑 - - - - - - - - - - - - - - - - - - - - -----------------

例子2

爱德华·克莱门茨

~~无需进行所有者绘制，只需使用SetWindowText()并处理WM_CTLCOLORSTATIC消息，请参见此SO代码中的代码~~<-如果窗口具有图案背景，则此方法将不起作用，我们需要将静态控件子类化并使用透明控件绘制文本时使用背景模式：

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{   MSG msg;
    WNDCLASS w;

    hInst = hInstance;
    memset(&w,0,sizeof(WNDCLASS));
    w.style = CS_HREDRAW | CS_VREDRAW;
    w.lpfnWndProc = WndProc;
    w.hInstance = hInst;
    w.hbrBackground = CreateHatchBrush(HS_DIAGCROSS, RGB(255, 0, 0));
    w.lpszClassName = L"My Class";
    w.hCursor = LoadCursor(NULL, IDC_ARROW); 
    RegisterClass(&w);

    HWND hWndWindow = CreateWindow(L"My Class", L"My title", WS_OVERLAPPEDWINDOW, 300, 200, 800, 600, NULL, NULL, hInst, NULL);

    ShowWindow(hWndWindow, nCmdShow);
    UpdateWindow(hWndWindow);

    while(GetMessage(&msg, NULL, 0, 0))
    {   TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    DeleteObject(w.hbrBackground);

    return msg.wParam;
}

WNDPROC StaticWndProc = NULL;
TCHAR szText[] = _T("TestString");

LRESULT CALLBACK MyStaticWndProc(HWND hwnd, UINT Message, WPARAM wparam, LPARAM lparam)
{   if (Message == WM_PAINT)
    {   RECT rc;
        PAINTSTRUCT ps;
        HDC hdc = BeginPaint(hwnd, &ps);
        GetClientRect(hwnd, &rc);
        SetBkMode(hdc, TRANSPARENT);
        DrawText(hdc, szText, _tcslen(szText), &rc, DT_CENTER | DT_VCENTER);
        EndPaint(hwnd, &ps);
        return 0;
    }

      //v2 StaticWndProc(hwnd, Message, wparam, lparam);
    return CallWindowProc(StaticWndProc, hwnd, Message, wparam, lparam); //v2
}

HWND hWndStatic; //v2
LONG WINAPI WndProc(HWND hwnd, UINT Message, WPARAM wparam, LPARAM lparam)
{   switch (Message)
    {   case WM_CREATE:
        {   LRESULT lRes = DefWindowProc(hwnd, Message, wparam, lparam);
            hWndStatic = CreateWindowEx(0, L"Static", NULL, WS_CHILD| WS_VISIBLE |SS_LEFT, 10, 130, 200, 40, hwnd, NULL, hInst, NULL); //v2 deleted HWND
            StaticWndProc = (WNDPROC) SetWindowLong(hWndStatic, GWL_WNDPROC, (LPARAM)MyStaticWndProc);
            return lRes;
        }

        case WM_DESTROY: 
            SetWindowLong(hWndStatic, GWL_WNDPROC, (LPARAM)StaticWndProc); //v2
            PostQuitMessage(0);
            break;

        default:
            return DefWindowProc(hwnd, Message, wparam, lparam);
    }

    return 0;
}

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