Method doSelectEvents

src/lib/platform/XWindowsScreen.cpp:1645–1689

}

void XWindowsScreen::doSelectEvents(Window w) const
{
  // we want to track the mouse everywhere on the display.  to achieve
  // that we select PointerMotionMask on every window.  we also select
  // SubstructureNotifyMask in order to get CreateNotify events so we
  // select events on new windows too.

  // we don't want to adjust our grab window
  if (w == m_window) {
    return;
  }

  // X11 has a design flaw. If *no* client selected PointerMotionMask for
  // a window, motion events will be delivered to that window's parent.
  // If *any* client, not necessarily the owner, selects PointerMotionMask
  // on such a window, X will stop propagating motion events to its
  // parent. This breaks applications that rely on event propagation
  // behavior.
  //
  // Avoid selecting PointerMotionMask unless some other client selected
  // it already.
  long mask = SubstructureNotifyMask;
  XWindowAttributes attr;
  XGetWindowAttributes(m_display, w, &attr);
  if ((attr.all_event_masks & PointerMotionMask) == PointerMotionMask) {
    mask |= PointerMotionMask;
  }

  // select events of interest.  do this before querying the tree so
  // we'll get notifications of children created after the XQueryTree()
  // so we won't miss them.
  XSelectInput(m_display, w, mask);

  // recurse on child windows
  Window rw;
  Window pw;
  Window *cw;
  unsigned int nc;
  if (XQueryTree(m_display, w, &rw, &pw, &cw, &nc)) {
    for (unsigned int i = 0; i < nc; ++i) {
      doSelectEvents(cw[i]);
    }
    XFree(cw);
  }
}

KeyID XWindowsScreen::mapKeyFromX(XKeyEvent *event) const
{