Lomiri
windowinputfilter.cpp
1 /*
2  * Copyright (C) 2014 Canonical Ltd.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; version 3.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program. If not, see <http://www.gnu.org/licenses/>.
15  *
16  * Author: Daniel d'Andrada <daniel.dandrada@canonical.com>
17  */
18 
19 #include "windowinputfilter.h"
20 
21 #include <QQuickWindow>
22 
23 WindowInputFilter::WindowInputFilter(QQuickItem *parent)
24  : QQuickItem(parent),
25  m_lastInputTimestamp(0)
26 {
27  connect(this, &QQuickItem::windowChanged,
28  this, &WindowInputFilter::setupFilterOnWindow);
29 }
30 
31 bool WindowInputFilter::eventFilter(QObject *watched, QEvent *event)
32 {
33  Q_ASSERT(!m_filteredWindow.isNull());
34  Q_ASSERT(watched == static_cast<QObject*>(m_filteredWindow.data()));
35  Q_UNUSED(watched);
36 
37  QInputEvent *inputEvent = dynamic_cast<QInputEvent*>(event);
38  if (inputEvent) {
39  m_lastInputTimestamp = inputEvent->timestamp();
40  Q_EMIT lastInputTimestampChanged();
41  }
42 
43  if (event->type() == QEvent::KeyPress || event->type() == QEvent::KeyRelease) {
44  // Let QML see this event and decide if it does not want it
45  event->accept();
46  QCoreApplication::sendEvent(this, event);
47  return event->isAccepted();
48  } else {
49  // Not interested
50  return false;
51  }
52 }
53 
54 void WindowInputFilter::setupFilterOnWindow(QQuickWindow *window)
55 {
56  if (!m_filteredWindow.isNull()) {
57  m_filteredWindow->removeEventFilter(this);
58  m_filteredWindow.clear();
59  }
60 
61  if (window) {
62  window->installEventFilter(this);
63  m_filteredWindow = window;
64  }
65 }
66 
67 ulong WindowInputFilter::lastInputTimestamp() const
68 {
69  return m_lastInputTimestamp;
70 }