bool QWindowsMouseHandler::translateScrollEvent(QWindow *window, HWND,
MSG msg, LRESULT *)
{
// This is a workaround against some touchpads that send WM_HSCROLL instead of WM_MOUSEHWHEEL.
// We could also handle vertical scroll here but there's no reason to, there's no bug for vertical
// (broken vertical scroll would have been noticed long time ago), so lets keep the change small
// and minimize the chance for regressions.
int delta = 0;
switch (LOWORD(msg.wParam)) {
case SB_LINELEFT:
delta = 120;
break;
case SB_LINERIGHT:
delta = -120;
break;
case SB_PAGELEFT:
delta = 240;
break;
case SB_PAGERIGHT:
delta = -240;
break;
default:
return false;
}
redirectWheelEvent(window, QCursor::pos(), delta, Qt::Horizontal, Qt::NoModifier);
return true;
}
bool QWindowsMouseHandler::translateMouseWheelEvent(QWindow *window, HWND,
MSG msg, LRESULT *)
{
const Qt::KeyboardModifiers mods = keyStateToModifiers(int(msg.wParam));
int delta;
if (msg.message == WM_MOUSEWHEEL || msg.message == WM_MOUSEHWHEEL)
delta = GET_WHEEL_DELTA_WPARAM(msg.wParam);
else
delta = int(msg.wParam);
Qt::Orientation orientation = (msg.message == WM_MOUSEHWHEEL
|| (mods & Qt::AltModifier)) ?
Qt::Horizontal : Qt::Vertical;
// according to the MSDN documentation on WM_MOUSEHWHEEL:
// a positive value indicates that the wheel was rotated to the right;
// a negative value indicates that the wheel was rotated to the left.
// Qt defines this value as the exact opposite, so we have to flip the value!
if (msg.message == WM_MOUSEHWHEEL)
delta = -delta;
const QPoint globalPos(GET_X_LPARAM(msg.lParam), GET_Y_LPARAM(msg.lParam));
redirectWheelEvent(window, globalPos, delta, orientation, mods);
return true;
}
void Piano::wheelEvent(QWheelEvent* ev)
{
emit redirectWheelEvent(ev);
}
void WidgetStack::wheelEvent(QWheelEvent* ev)
{
emit redirectWheelEvent(ev);
}
