Unity 8
windowkeysfilter.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 "windowkeysfilter.h"
20 
21 #include <QQuickWindow>
22 
23 WindowKeysFilter::WindowKeysFilter(QQuickItem *parent)
24  : QQuickItem(parent),
25  m_currentEventTimestamp(0)
26 {
27  connect(this, &QQuickItem::windowChanged,
28  this, &WindowKeysFilter::setupFilterOnWindow);
29 }
30 
31 bool WindowKeysFilter::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  if (event->type() == QEvent::KeyPress || event->type() == QEvent::KeyRelease) {
38  // Let QML see this event and decide if it does not want it
39  event->accept();
40 
41  m_currentEventTimestamp = static_cast<QInputEvent*>(event)->timestamp();
42  Q_EMIT currentEventTimestampChanged();
43 
44  QCoreApplication::sendEvent(this, event);
45 
46  m_currentEventTimestamp = 0;
47  Q_EMIT currentEventTimestampChanged();
48 
49  return event->isAccepted();
50  } else {
51  // Not interested
52  return false;
53  }
54 }
55 
56 void WindowKeysFilter::setupFilterOnWindow(QQuickWindow *window)
57 {
58  if (!m_filteredWindow.isNull()) {
59  m_filteredWindow->removeEventFilter(this);
60  m_filteredWindow.clear();
61  }
62 
63  if (window) {
64  window->installEventFilter(this);
65  m_filteredWindow = window;
66  }
67 }
68 
69 ulong WindowKeysFilter::currentEventTimestamp() const
70 {
71  return m_currentEventTimestamp;
72 }