C++ Win32:测试鼠标是否悬停了一秒钟_C++_Winapi_Callback_Mouse

C++ Win32:测试鼠标是否悬停了一秒钟

c++ winapi

C++ Win32:测试鼠标是否悬停了一秒钟,c++,winapi,callback,mouse,C++,Winapi,Callback,Mouse,我正在尝试创建一个函数，该函数仅在鼠标在同一位置停留一段时间后才运行，而不会使程序暂停（因此没有Sleep（1000）functions）。我试着让回调函数在鼠标移动时在paint中运行一个函数。在该函数中，将有一个while循环，确保鼠标自上一帧起没有移动，如果单击或移动鼠标，鼠标将断开在回调中： case WM_MOUSEMOVE: POINT pt; GetCursorPos(&pt); ScreenToClient(hWnd, &pt);

我正在尝试创建一个函数，该函数仅在鼠标在同一位置停留一段时间后才运行，而不会使程序暂停（因此没有

Sleep（1000）

functions）。我试着让回调函数在鼠标移动时在paint中运行一个函数。在该函数中，将有一个while循环，确保鼠标自上一帧起没有移动，如果单击或移动鼠标，鼠标将断开

在回调中：

case WM_MOUSEMOVE:
    POINT pt;
    GetCursorPos(&pt);
    ScreenToClient(hWnd, &pt);
    iPosX = pt.x;
    iPosY = pt.y;

    if (!mouseMoved) {
        mouseMoved = true;
        period = 0;
        InvalidateRect(hWnd, 0, FALSE);
    }
    break;

在油漆中：

       if (mouseMoved && !MouseClicked) {

            test.newBit(1, 100, 0, hdc); //Draws a picture as a test

            oldx = iPosX;
            oldy = iPosY;

            period = 0;

            while (period <= 1000000 && !MouseClicked) {

                oldx = iPosX;
                oldy = iPosY;

                POINT pt;
                GetCursorPos(&pt);
                ScreenToClient(hWnd, &pt);
                iPosX = pt.x;
                iPosY = pt.y;

                if (iPosX != oldx || iPosY != oldy) {
                    mouseMoved = false;
                    period = 0;
                    break;
                }

                period++;
            }

            if (period <= 1000000) {
                period = 0;
                test.newBit(0, 0, 0, hdc); //Draws a picture as a test
                mouseMoved = false;
            }

        }

if（mouseMoved&！MouseClicked）{
test.newBit（1100,0，hdc）；//绘制一张图片作为测试
oldx=iPosX；
oldy=Ipsy；
周期=0；
while（period系统已为您实现此功能。您只需通过调用以下命令来请求鼠标悬停消息：
当光标在调用TrackMouseEvent
中指定的时间段内悬停在窗口的客户端区域时，应用程序会收到一条消息。一旦生成WM\u MOUSEHOVER
消息，悬停跟踪就会停止。要进一步接收WM\u MOUSEHOVER
消息，应用程序需要重新请求hover跟踪（使用与上述代码相同的代码）
应用程序可以调用并使用SPI\u GETMOUSEHOVERTIME
检索默认的悬停超时
请注意，这将考虑悬停矩形（SPI_GETMOUSEHOVERWIDTH
和SPI_GETMOUSEHOVERHEIGHT
）。这是鼠标光标周围的一个区域，允许鼠标在不重置悬停超时的情况下向内移动

如果你需要一个只在鼠标完全没有移动时报告鼠标悬停的解决方案，你必须自己实现。一个基于计时器的解决方案是一个干净的解决方案
每当鼠标移动时，我们都需要重置计时器。如果鼠标以前在窗口的客户端区域之外，我们还必须重新请求WM_MOUSELEAVE
消息。这是必要的，以便在鼠标离开客户端区域时取消计时器：
LRESULT CALLBACK WndProc( HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam ) {
    enum TimerId { TimerId_MouseHover = 1 };
    static const UINT HoverTimeoutInMs = 1000;
    static int PrevX = INT_MIN;
    static int PrevY = INT_MIN;
    static bool IsMouseOutside = true;
    static bool IsMouseHovered = false;

    switch ( message ) {

    case WM_MOUSEMOVE: {
        // If mouse was previously outside, re-request WM_MOUSELEAVE messages
        if ( IsMouseOutside ) {
            TRACKMOUSEEVENT tme = { sizeof( tme ) };
            tme.dwFlags = TME_LEAVE;
            tme.hwndTrack = hWnd;
            ::TrackMouseEvent( &tme );
            IsMouseOutside = false;
        }

        int CurrX = GET_X_LPARAM( lParam );
        int CurrY = GET_Y_LPARAM( lParam );
        if ( ( CurrX != PrevX ) || ( CurrY != PrevY ) ) {
            // Mouse moved -> reset timer
            ::SetTimer( hWnd, TimerId_MouseHover, HoverTimeoutInMs, nullptr );
            PrevX = CurrX;
            PrevY = CurrY;
            IsMouseHovered = false;
            // For testing only:
            ::InvalidateRect( hWnd, nullptr, FALSE );
        }
        return 0;
    }

    case WM_MOUSELEAVE:
        ::KillTimer( hWnd, TimerId_MouseHover );
        IsMouseOutside = true;
        PrevX = INT_MIN;
        PrevY = INT_MIN;
        return 0;

每当鼠标离开客户端区域时，我们都需要取消计时器。如果不取消计时器，即使鼠标移动到窗口客户端区域之外，计时器也会过期：
LRESULT CALLBACK WndProc( HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam ) {
    enum TimerId { TimerId_MouseHover = 1 };
    static const UINT HoverTimeoutInMs = 1000;
    static int PrevX = INT_MIN;
    static int PrevY = INT_MIN;
    static bool IsMouseOutside = true;
    static bool IsMouseHovered = false;

    switch ( message ) {

    case WM_MOUSEMOVE: {
        // If mouse was previously outside, re-request WM_MOUSELEAVE messages
        if ( IsMouseOutside ) {
            TRACKMOUSEEVENT tme = { sizeof( tme ) };
            tme.dwFlags = TME_LEAVE;
            tme.hwndTrack = hWnd;
            ::TrackMouseEvent( &tme );
            IsMouseOutside = false;
        }

        int CurrX = GET_X_LPARAM( lParam );
        int CurrY = GET_Y_LPARAM( lParam );
        if ( ( CurrX != PrevX ) || ( CurrY != PrevY ) ) {
            // Mouse moved -> reset timer
            ::SetTimer( hWnd, TimerId_MouseHover, HoverTimeoutInMs, nullptr );
            PrevX = CurrX;
            PrevY = CurrY;
            IsMouseHovered = false;
            // For testing only:
            ::InvalidateRect( hWnd, nullptr, FALSE );
        }
        return 0;
    }

    case WM_MOUSELEAVE:
        ::KillTimer( hWnd, TimerId_MouseHover );
        IsMouseOutside = true;
        PrevX = INT_MIN;
        PrevY = INT_MIN;
        return 0;

如果计时器过期，则会发生悬停事件：
    case WM_TIMER:
        if ( wParam == TimerId_MouseHover ) {
            // The mouse hasn't been moved for the specified timeout:
            // This is a hover event
            IsMouseHovered = true;
            // For testing only:
            ::InvalidateRect( hWnd, nullptr, FALSE );
            return 0;
        }
        else {
            return ::DefWindowProc( hWnd, message, wParam, lParam );
        }

作为测试，每当悬停超时过期时，让我们用黑色笔刷填充客户端区域：
    case WM_PAINT: {
        PAINTSTRUCT ps;
        HDC hdc = BeginPaint( hWnd, &ps );
        ::FillRect( hdc, &ps.rcPaint, GetStockBrush( IsMouseHovered ? BLACK_BRUSH :
                                                                      WHITE_BRUSH ) );
        EndPaint( hWnd, &ps );
        return 0;
    }

请注意，当鼠标离开某个区域（由SPI\u GETMOUSEHOVERWIDTH
和SPI\u GETMOUSEHOVERHEIGHT
定义）时，将报告此情况，不是一个像素。哦！它不合理地闪烁的原因是小于号应该是大于号…哦，你可以通过在WM_MOUSEMOVE
：KillTimer（）；SetTimer（）中设置计时器来更轻松地完成
并从WM_TIMER
事件调用函数。如果在机器上运行此代码，速度会比您的快？或者在机器上运行速度会比您的慢？