在使用 c++ 的 win32 api 中，我想跟踪双击和三次单击等

In win32 api using c++ i want to track double click and triple click and so on

本文关键字：双击 单击 三次 跟踪 c++ win32 api      更新时间：2023-10-16
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);
}
}

这是我为处理双击而制定的功能： 当窗口收到WM_LBUTTONDOWN时调用此函数，它将花费消息的时间和单击的坐标，并将其传输到此处的函数，我希望功能接收另一条消息WM_LBUTTONDOWN并确定消息的时间并与上一次单击时间和坐标进行比较以确定它是否是双击。 但这不起作用.可能是我的方法错了，我是新手，请帮助我解决这个问题。

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);
}

可以使用SetTimer，一次点击后，不要立即判断为点击，而是启动计时器，检查计时器范围内是否有另一次点击，如果有，则判断为双击，如果没有，则确定为单点击。

#define TIMER_ID 10
static int click_count = 0;
static POINT point = { 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)
{
wchar_t waCoord[20];
wsprintf(waCoord, _T("(%i,%i)"), point.x, point.y);
MessageBox(hWnd, waCoord, _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;
}

并确保您的窗口没有CS_DBLCLKS样式。否则，根据文档，通常会生成的第二条WM_LBUTTONDOWN消息将成为WM_LBUTTONDBLCLK消息： 双击

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