如何使静态窗口在鼠标悬停时增加大小

Question

我在另一个窗口中有一堆窗口。 子窗口在MainWindow 类的CreateBoard() 方法中创建。 MainWindow 和 GemWindow 的 Create() 方法来自 MS Documentation BaseWindow 抽象类，这是通过调用 RegisterClass() 注册每个类的地方

template <class DERIVED_TYPE>
class BaseWindow
{
public:
    static LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
    {
        DERIVED_TYPE* pThis = NULL;

        if (uMsg == WM_NCCREATE)
        {
            CREATESTRUCT* pCreate = (CREATESTRUCT*)lParam;
            pThis = (DERIVED_TYPE*)pCreate->lpCreateParams;
            SetWindowLongPtr(hwnd, GWLP_USERDATA, (LONG_PTR)pThis);

            pThis->m_hwnd = hwnd;
        }
        else
        {
            pThis = (DERIVED_TYPE*)GetWindowLongPtr(hwnd, GWLP_USERDATA);
        }
        if (pThis)
        {
            //getting read access violation here why?
            //because on resize you are not initializing tiles
            //but resizing the thing
            return pThis->HandleMessage(uMsg, wParam, lParam);
        }
        else
        {
            return DefWindowProc(hwnd, uMsg, wParam, lParam);
        }
    }

    BaseWindow() : m_hwnd(NULL) { }

    BOOL Create(
        PCWSTR lpWindowName,
        DWORD dwStyle,
        DWORD dwExStyle = 0,
        int x = CW_USEDEFAULT,
        int y = CW_USEDEFAULT,
        int nWidth = CW_USEDEFAULT,
        int nHeight = CW_USEDEFAULT,
        HWND hWndParent = 0,
        HMENU hMenu = 0
    )
    {
        WNDCLASS wc = { 0 };

        wc.lpfnWndProc = DERIVED_TYPE::WindowProc;
        wc.hInstance = GetModuleHandle(NULL);
        wc.lpszClassName = ClassName();

        RegisterClass(&wc);

        m_hwnd = CreateWindowEx(
            dwExStyle, ClassName(), lpWindowName, dwStyle, x, y,
            nWidth, nHeight, hWndParent, hMenu, GetModuleHandle(NULL), this
        );

        return (m_hwnd ? TRUE : FALSE);
    }

    //returns handle
    HWND Window() const { return m_hwnd; }

protected:

    virtual PCWSTR  ClassName() const = 0;
    virtual LRESULT HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam) = 0;

    HWND m_hwnd;
};

CreateBoard() 方法在棋盘中创建宝石。

BOOL MainWindow::CreateBoard()
{
    for (unsigned int i = 0; i < GetcGem(); i++)
    {
        for (unsigned int j = 0; j < GetcGem(); j++)
        {
            if (Gems[i][j].Create(L"gem", WS_CHILDWINDOW | WS_VISIBLE, NULL, 
              5 + i * GetsGem().cx + i * 10, 
              5 + j * GetsGem().cy + j * 10, GetsGem().cx, GetsGem().cy, Window(), NULL))
            {
                //pass from main window to Gem object
                Gems[i][j].SetSize(GetsGem().cx, GetsGem().cy);
                Gems[i][j].SetPosition(5 + i * GetsGem().cx + i * 10, 5 + j * GetsGem().cy + j * 10);

                HBRUSH hbrush = CreateSolidBrush(RGB(125,125,125));
                HBRUSH hOldBrush = (HBRUSH)SetClassLongPtr(Gems[i][j].Window(), GCLP_HBRBACKGROUND, (LONG_PTR)hbrush);
                DeleteObject(hOldBrush);
                InvalidateRect(Gems[i][j].Window(), NULL, TRUE);

            }
            else
            {
                return FALSE;
            }
        }
    }
    return TRUE;
}

我希望每个子窗口在鼠标悬停时分别将其大小增加 4 个像素。但是，扩大尺寸后，它们会留下痕迹，有时悬停在单个窗口上会增加整行或整列的大小。引用Image，例如：

我有每个子窗口的处理代码如下。 tracking 是 GemWindow 类中的 static BOOL

BOOL GemWindow::tracking = false;

LRESULT GemWindow::HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
    case WM_DESTROY:
        DestroyWindow(Window());
        break;

    case WM_MOUSEMOVE:
    {
        if (!tracking) {
            TrackMouse();
            tracking = true;
        }

    }break;

    case WM_MOUSEHOVER:
    {
        MoveWindow(Window(), GetSize().cx + 4, GetSize().cy + 4, GetPosition().x - 2, GetPosition().y - 2, TRUE);
        InvalidateRect(Window(), NULL, TRUE);
        OutputDebugString(L"MOUSE ENTERED\n");
    }break;

    case WM_MOUSELEAVE:
    {
        MoveWindow(Window(), GetSize().cx, GetSize().cy, GetPosition().x, GetPosition().y, TRUE);
        InvalidateRect(Window(), NULL, TRUE);
        OutputDebugString(L"MOUSE LEFT\n");
        tracking = false;
    }break;


    case WM_PAINT:
    {
        PAINTSTRUCT ps;
        HDC hdc = BeginPaint(m_hwnd, &ps);
        //FillRect(hdc, &ps.rcPaint, CreateSolidBrush(color));
        EndPaint(m_hwnd, &ps);
        //OutputDebugString(L"PAINT\n");
    }
    return 0;

    default:
        return DefWindowProc(m_hwnd, uMsg, wParam, lParam);
    }
    return TRUE;
}

TrackMouse()是GemWindow的一个方法，它初始化一个TRACKMOUSEEVENT并调用TrackMouseEvent()

    //method for tracking mouse
    void TrackMouse(/*reusability enhanced if you add arguments in the future*/)
    {
        TRACKMOUSEEVENT tme;
        tme.cbSize = sizeof(TRACKMOUSEEVENT);
        tme.dwFlags = TME_HOVER | TME_LEAVE; //Type of events to track & trigger.
        tme.dwHoverTime = 1; //How long the mouse has to be in the window to trigger a hover event.
        tme.hwndTrack = Window();
        TrackMouseEvent(&tme);
    }

我认为这是因为我没有更新区域，但这样做并没有改变任何东西。我对这个错误感到困惑，想不出任何好的理由。

感谢所有花时间提供帮助的人。

Answer 1

BOOL MoveWindow(
  HWND hWnd,
  int  X,  //The new position of the left side of the window.
  int  Y,  //The new position of the top of the window.
  int  nWidth, //The new width of the window.
  int  nHeight, //The new height of the window.
  BOOL bRepaint
);

修改如下代码：

   case WM_MOUSEHOVER:
    {
//      MoveWindow(Window(), GetSize().cx + 4, GetSize().cy + 4, GetPosition().x - 2, GetPosition().y - 2, TRUE);
        MoveWindow(Window(), GetPosition().x - 2, GetPosition().y - 2, GetSize().cx + 4, GetSize().cy + 4, TRUE);            
        ...

    case WM_MOUSELEAVE:
    {
 //     MoveWindow(Window(), GetSize().cx, GetSize().cy, GetPosition().x, GetPosition().y, TRUE);
        MoveWindow(Window(), GetPosition().x, GetPosition().y, GetSize().cx, GetSize().cy,  TRUE);
        ...

调试：