在使用c ++的win32 api中，我想跟踪双击和三次单击，等等

Question

LRESULT handleDoubleClicks(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam, POINT ptLastClickPos, DWORD dwLastClickTime)
{
    DWORD dwClickTime = GetMessageTime();
    POINT ptClickPos = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
    switch(message)
    {
    case  WM_LBUTTONDOWN:
        if (dwLastClickTime + GetDoubleClickTime() > dwClickTime
            && abs(ptLastClickPos.x - ptClickPos.x) < GetSystemMetrics(SM_CXDOUBLECLK)
            && abs(ptLastClickPos.y - ptClickPos.y) < GetSystemMetrics(SM_CYDOUBLECLK))
        {
            MessageBox(hWnd, TEXT("Double click"), TEXT("I appear when double clicked"), MB_OKCANCEL);

        }
        else
        {
            dwLastClickTime = dwClickTime;
            ptLastClickPos = ptClickPos;
            wchar_t waCoord[20];
            wsprintf(waCoord, _T("(%i,%i)"), ptLastClickPos.x, ptLastClickPos.y);
            MessageBox(hWnd, waCoord, _T("Left mouse button click"), MB_OK);
        }
        break;
     default:
         return DefWindowProc(hWnd, message, wParam, lParam);
    }
}

这是我用来处理双击的功能：当Windows收到WM_LBUTTONDOWN时，将调用此函数，它将花费消息的时间和单击的坐标，并将其传递给此处的函数。我希望功能接收到另一条消息WM_LBUTTONDOWN并确定消息的时间，并且与上次点击时间和坐标进行比较，以确定是否为双击。但这是行不通的。可能是我对我是新手的方法不对。请您帮我解决这个问题。

 case WM_LBUTTONDOWN:
   {
        dwLastClickTime= GetMessageTime();
        // SetTimer(hWnd,0,GetDoubleClickTime(),0);
        ptLastClickPos.x = LOWORD(lParam);
        ptLastClickPos.y = HIWORD(lParam);
        handleDoubleClicks(hWnd, message, wParam, lParam, ptLastClickPos, dwLastClickTime);

   }

Answer 1

您可以使用SetTimer，单击一次后，不立即将其判断为一次单击，而是启动计时器，检查计时器范围内是否还有另一次单击，如果存在，则判断为双击，如果否，并且上次时间确定为一次单击。

SetTimer

并确保您的窗口没有

#define TIMER_ID 10
static int click_count = 0;
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_TIMER:
    {
        KillTimer(hWnd, TIMER_ID);
        if (click_count == 1)
        {
            MessageBox(hWnd, TEXT("click"), _T("Left mouse button click"), MB_OK);
        }
        else if(click_count == 2)
        {
            MessageBox(hWnd, TEXT("Double click"), TEXT("I appear when double clicked"), MB_OKCANCEL);
        }
        else if (click_count == 3)
        {
            MessageBox(hWnd, TEXT("Triple click"), TEXT("I appear when triple clicked"), MB_OKCANCEL);
        }
        click_count = 0;
        return 0;
    }
    break;
    case WM_LBUTTONDOWN:
    {
        if (click_count == 0)
        {
            SetTimer(hWnd, TIMER_ID, GetDoubleClickTime(), NULL);
        }
        click_count++;
        return 0;
    }
    break;
    case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hWnd, &ps);
            // TODO: Add any drawing code that uses hdc here...
            EndPaint(hWnd, &ps);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

样式。否则，根据文档，通常会生成的第二个CS_DBLCLKS消息将变成WM_LBUTTONDOWN消息：WM_LBUTTONDBLCLK