git.iko.soy/unity8
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unity8/plugins/Ubuntu/Gestures/PressedOutsideNotifier.cpp
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1/*
2 * Copyright (C) 2013 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 */
17#include "PressedOutsideNotifier.h"
19#include <QMouseEvent>
21PressedOutsideNotifier::PressedOutsideNotifier(QQuickItem *parent)
22 : QQuickItem(parent)
24 connect(this, &QQuickItem::enabledChanged,
25 this, &PressedOutsideNotifier::setupOrTearDownEventFiltering);
27 m_signalEmissionTimer.setSingleShot(true);
28 m_signalEmissionTimer.setInterval(0); // times out on the next iteration of the event loop
29 connect(&m_signalEmissionTimer, &QTimer::timeout,
30 this, &PressedOutsideNotifier::pressedOutside);
33bool PressedOutsideNotifier::eventFilter(QObject *watched, QEvent *event)
35 Q_UNUSED(watched);
36 Q_ASSERT(watched == m_filteredWindow);
38 // We are already going to emit pressedOutside() anyway, thus no need
39 // for new checks.
40 // This case takes place when a QTouchEvent comes in and isn't handled by any item,
41 // causing QQuickWindow to synthesize a QMouseEvent out of it, which would
42 // be filtered by us as well and count as a second press, which is wrong.
43 if (m_signalEmissionTimer.isActive()) {
44 return false;
45 }
47 switch (event->type()) {
48 case QEvent::MouseButtonPress: {
49 QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);
50 QPointF p = mapFromScene(mouseEvent->windowPos());
51 if (!contains(p)) {
52 m_signalEmissionTimer.start();
53 }
54 break;
55 }
56 case QEvent::TouchBegin:
57 processFilteredTouchBegin(static_cast<QTouchEvent*>(event));
58 default:
59 break;
60 }
62 // let the event be handled further
63 return false;
66void PressedOutsideNotifier::itemChange(ItemChange change, const ItemChangeData &value)
68 if (change == QQuickItem::ItemSceneChange) {
69 setupOrTearDownEventFiltering();
70 }
72 QQuickItem::itemChange(change, value);
75void PressedOutsideNotifier::setupOrTearDownEventFiltering()
77 if (isEnabled() && window()) {
78 setupEventFiltering();
79 } else if (m_filteredWindow) {
80 tearDownEventFiltering();
81 }
84void PressedOutsideNotifier::setupEventFiltering()
86 QQuickWindow *currentWindow = window();
87 Q_ASSERT(currentWindow != nullptr);
89 if (currentWindow == m_filteredWindow)
90 return;
92 if (m_filteredWindow) {
93 m_filteredWindow->removeEventFilter(this);
94 }
96 currentWindow->installEventFilter(this);
97 m_filteredWindow = currentWindow;
100void PressedOutsideNotifier::tearDownEventFiltering()
102 m_filteredWindow->removeEventFilter(this);
103 m_filteredWindow.clear();
106void PressedOutsideNotifier::processFilteredTouchBegin(QTouchEvent *event)
108 const QList<QTouchEvent::TouchPoint> &touchPoints = event->touchPoints();
109 for (int i = 0; i < touchPoints.count(); ++i) {
110 const QTouchEvent::TouchPoint &touchPoint = touchPoints.at(i);
111 if (touchPoint.state() == Qt::TouchPointPressed) {
112 QPointF p = mapFromScene(touchPoint.pos());
113 if (!contains(p)) {
114 m_signalEmissionTimer.start();
115 return;
116 }
117 }
118 }