Unity 8
PhysicalKeysMapper.qml
1 /*
2  * Copyright (C) 2014-2015 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 
17 import QtQuick 2.0
18 import Powerd 0.1
19 
20 /*!
21  \brief A mapper for the physical keys on the device
22 
23  A mapper to handle events triggered by pressing physical keys on a device.
24  Keys included are
25  * Volume Decrease
26  * Volume Increase
27  * Power
28 
29  This allows for handling the following events
30  * Power dialog
31  * Volume Decreases/Increases
32  * Screenshots
33 */
34 
35 Item {
36  id: root
37 
38  signal powerKeyLongPressed;
39  signal volumeDownTriggered;
40  signal volumeUpTriggered;
41  signal screenshotTriggered;
42 
43  readonly property bool altTabPressed: d.altTabPressed
44 
45  property int powerKeyLongPressTime: 2000
46 
47  // For testing. If running windowed (e.g. tryShell), Alt+Tab is taken by the
48  // running desktop, set this to true to use Ctrl+Tab instead.
49  property bool controlInsteadOfAlt: false
50 
51  QtObject {
52  id: d
53 
54  property bool volumeDownKeyPressed: false
55  property bool volumeUpKeyPressed: false
56  property bool ignoreVolumeEvents: false
57 
58  property bool altPressed: false
59  property bool altTabPressed: false
60  }
61 
62  Timer {
63  id: powerKeyLongPressTimer
64  interval: root.powerKeyLongPressTime
65  onTriggered: root.powerKeyLongPressed();
66  }
67 
68  function onKeyPressed(event) {
69  if ((event.key == Qt.Key_PowerDown || event.key == Qt.Key_PowerOff)
70  && (!event.isAutoRepeat || !powerKeyLongPressTimer.running)) {
71 
72  // FIXME: We only consider power key presses if the screen is
73  // on because of bugs 1410830/1409003. The theory is that when
74  // those bugs are encountered, there is a >2s delay between the
75  // power press event and the power release event, which causes
76  // the shutdown dialog to appear on resume. So to avoid that
77  // symptom while we investigate the root cause, we simply won't
78  // initiate any dialogs when the screen is off.
79  if (Powerd.status === Powerd.On) {
80  powerKeyLongPressTimer.restart();
81  }
82  } else if ((event.key == Qt.Key_MediaTogglePlayPause || event.key == Qt.Key_MediaPlay) && !event.isAutoRepeat) {
83  event.accepted = callManager.handleMediaKey(false);
84  } else if (event.key == Qt.Key_VolumeDown) {
85  if (event.isAutoRepeat && !d.ignoreVolumeEvents) root.volumeDownTriggered();
86  else if (!event.isAutoRepeat) {
87  if (d.volumeUpKeyPressed) {
88  if (Powerd.status === Powerd.On) {
89  root.screenshotTriggered();
90  }
91  d.ignoreVolumeEvents = true;
92  }
93  d.volumeDownKeyPressed = true;
94  }
95  } else if (event.key == Qt.Key_VolumeUp) {
96  if (event.isAutoRepeat && !d.ignoreVolumeEvents) root.volumeUpTriggered();
97  else if (!event.isAutoRepeat) {
98  if (d.volumeDownKeyPressed) {
99  if (Powerd.status === Powerd.On) {
100  root.screenshotTriggered();
101  }
102  d.ignoreVolumeEvents = true;
103  }
104  d.volumeUpKeyPressed = true;
105  }
106  } else if (event.key == Qt.Key_Alt || (root.controlInsteadOfAlt && event.key == Qt.Key_Control)) {
107  d.altPressed = true;
108  } else if (event.key == Qt.Key_Tab) {
109  if (d.altPressed && !d.altTabPressed) {
110  d.altTabPressed = true;
111  event.accepted = true;
112  }
113  }
114  }
115 
116  function onKeyReleased(event) {
117  if (event.key == Qt.Key_PowerDown || event.key == Qt.Key_PowerOff) {
118  powerKeyLongPressTimer.stop();
119  event.accepted = true;
120  } else if (event.key == Qt.Key_VolumeDown) {
121  if (!d.ignoreVolumeEvents) root.volumeDownTriggered();
122  d.volumeDownKeyPressed = false;
123  if (!d.volumeUpKeyPressed) d.ignoreVolumeEvents = false;
124  } else if (event.key == Qt.Key_VolumeUp) {
125  if (!d.ignoreVolumeEvents) root.volumeUpTriggered();
126  d.volumeUpKeyPressed = false;
127  if (!d.volumeDownKeyPressed) d.ignoreVolumeEvents = false;
128  } else if (event.key == Qt.Key_Alt || (root.controlInsteadOfAlt && event.key == Qt.Key_Control)) {
129  d.altPressed = false;
130  if (d.altTabPressed) {
131  d.altTabPressed = false;
132  event.accepted = true;
133  }
134  }
135  }
136 }