AnimateWindow 未调用 WM_PAINT

Question

我需要为呈现的 window 的显示设置动画，我有一个 WM_PRINTCLIENT 和 WM_PAINT 事件，但是 window 在动画期间没有呈现，仅在动画显示后使用 RedrawWindow

WNDCLASSW Wcc;
MSG Msg;
Wcc.style = CS_HREDRAW | CS_VREDRAW;
Wcc.lpfnWndProc = &this->_ChildWndProc;
Wcc.cbClsExtra = 0;
Wcc.cbWndExtra = 0;
Wcc.hInstance = (HINSTANCE)GetWindowLong(hParent, GWL_HINSTANCE);
hInst_ = (HINSTANCE)GetWindowLong(hParent, GWL_HINSTANCE);
Wcc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
Wcc.hCursor = LoadCursor(NULL, IDC_ARROW);
Wcc.hbrBackground = reinterpret_cast<HBRUSH> (CreateSolidBrush(RGB( 255, 255, 255)));
Wcc.lpszMenuName = NULL;
Wcc.lpszClassName = className;
this->className = className;
this->hParent = hWnd;
this->text = text;
this->title = title;
//this->title = title;
windowW = 450;
windowH = 300;

hChild = CreateWindowExW(0, Wcc.lpszClassName, 0, WS_POPUP | WS_MINIMIZEBOX, x, y,
    windowW, windowH, hWnd, NULL, (HINSTANCE)GetWindowLong(hParent, GWL_HINSTANCE), NULL);
loadResources(hChild);
SetWindowLongPtrW(hChild, GWLP_USERDATA, (LONG)this);
//SetTransparency(hChild, 0x0f);
//ShowWindow(hChild, SW_SHOW);

AnimateWindow(hChild, 1000, AW_ACTIVATE | AW_BLEND);

绘画：

case WM_PAINT:
{
    Paint(hDlg);
    break;
}
case WM_PRINTCLIENT:
{
    PaintA(hDlg);
    break;
}

Paint(HWND hwnd)
{
    PAINTSTRUCT ps;
    HDC hdc = BeginPaint(hwnd, &ps);
    Graphics graphics(hdc);

    Image image(L"g:\_project\image viewer\ipcamera.jpg");
    graphics.DrawImage(&image, 0, 0);
    EndPaint(hwnd, &ps);
}
PaintA(HWND hwnd)
{
    
    HDC hdc = GetDC(hwnd);
    Graphics graphics(hdc);

    Image image(L"g:\_project\image viewer\ipcamera.jpg");
    graphics.DrawImage(&image, 0, 0);
   
}

enter image description here

Answer 1

我已经采用了你的代码，所以我可以运行它是孤立的。我在动画期间确实得到了调试输出 WM_PRINTCLIENT。

void foo(HINSTANCE hInst, HWND hParent) {
    static const wchar_t* className = L"myClassName";
    WNDCLASSW Wcc = {};
    MSG Msg;
    Wcc.style = CS_HREDRAW | CS_VREDRAW;
    Wcc.lpfnWndProc = ChildWndProc;
    Wcc.cbClsExtra = 0;
    Wcc.cbWndExtra = 0;
    Wcc.hInstance = hInst;
    Wcc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    Wcc.hCursor = LoadCursor(NULL, IDC_ARROW);
    Wcc.hbrBackground = CreateSolidBrush(RGB(255, 0, 255));
    Wcc.lpszMenuName = NULL;
    Wcc.lpszClassName = className;

    RegisterClassW(&Wcc);

    HWND hChild = CreateWindowW(className, nullptr, WS_POPUP | WS_MINIMIZEBOX, 100, 200, 300, 400, nullptr, nullptr, hInst, nullptr);

    AnimateWindow(hChild, 2000, AW_ACTIVATE | AW_BLEND);
}

这是我使用的 window 过程：

LRESULT CALLBACK ChildWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_PAINT:
    {
        ::OutputDebugString(L"WM_PAINT\n");
        PAINTSTRUCT ps;
        HDC hdc = BeginPaint(hWnd, &ps);
        EndPaint(hWnd, &ps);
    }
    case WM_PRINTCLIENT:
    {
        ::OutputDebugString(L"WM_PRINTCLIENT\n");
        HDC hdc = (HDC)wParam;
        ::MoveToEx(hdc, 10, 10, nullptr);
        ::LineTo(hdc, 100, 100);
    }
    case WM_ERASEBKGND:
    {
        ::OutputDebugString(L"WM_ERASEBKGND\n");
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

注意：

详情请见WM_PRINTCLIENT留言

A window can process this message in much the same manner as WM_PAINT, except that BeginPaint and EndPaint need not be called (a device context is provided), and the window should draw its entire client area rather than just the invalid region.

AnimateWindow 未调用 WM_PAINT

AnimateWindow not calling WM_PAINT

c++

winapi