Differential D4939 Diff 12509 daemon/powerdevilpowermanagement.cpp

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daemon/powerdevilpowermanagement.cpp

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1​/********************************************************************
2​Copyright 2016 Martin Gräßlin <mgraesslin@kde.org>
3​
4​This library is free software; you can redistribute it and/or
5​modify it under the terms of the GNU Lesser General Public
6​License as published by the Free Software Foundation; either
7​version 2.1 of the License, or (at your option) version 3, or any
8​later version accepted by the membership of KDE e.V. (or its
9​successor approved by the membership of KDE e.V.), which shall
10​act as a proxy defined in Section 6 of version 3 of the license.
11​
12​This library is distributed in the hope that it will be useful,
13​but WITHOUT ANY WARRANTY; without even the implied warranty of
14​MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15​Lesser General Public License for more details.
16​
17​You should have received a copy of the GNU Lesser General Public
18​License along with this library. If not, see <http://www.gnu.org/licenses/>.
19​*********************************************************************/
20​
21​#include "powerdevilpowermanagement.h"
22​
23​#include <QDBusConnection>
24​#include <QDBusConnectionInterface>
25​#include <QDBusServiceWatcher>
26​
27​namespace PowerDevil {
28​
29​static const QString s_fdoPowerService = QStringLiteral("org.freedesktop.PowerManagement");
30​static const QString s_fdoPowerPath = QStringLiteral("/org/freedesktop/PowerManagement");
31​
32​class PowerManagementInstance : public PowerManagement
33​{
34​ Q_OBJECT
35​public:
36​ explicit PowerManagementInstance() : PowerManagement() {}
37​};
38​Q_GLOBAL_STATIC(PowerManagementInstance, s_instance)
39​
40​class PowerManagement::Private
41​{
42​public:
43​ Private(PowerManagement *q);
44​ void update();
45​ void setCanSuspend(bool set);
46​ void setCanHibernate(bool set);
47​
48​ bool serviceRegistered;
49​ bool canSuspend;
50​ bool canHibernate;
51​ QScopedPointer<QDBusServiceWatcher> fdoPowerServiceWatcher;
52​
53​private:
54​ void updateProperty(const QString &dbusName, void (Private::*setter)(bool));
55​ PowerManagement *q;
56​};
57​
58​PowerManagement::Private::Private(PowerManagement *q)
59​ : serviceRegistered(false)
60​ , canSuspend(false)
61​ , canHibernate(false)
62​ , fdoPowerServiceWatcher(new QDBusServiceWatcher(s_fdoPowerService, QDBusConnection::sessionBus(), QDBusServiceWatcher::WatchForUnregistration | QDBusServiceWatcher::WatchForRegistration))
63​ , q(q)
64​{
65​}
66​
67​void PowerManagement::Private::update()
68​{
69​ serviceRegistered = true;
70​ updateProperty(QStringLiteral("CanSuspend"), &Private::setCanSuspend);
71​ updateProperty(QStringLiteral("CanHibernate"), &Private::setCanHibernate);
72​}
73​
74​void PowerManagement::Private::updateProperty(const QString &dbusName, void (Private::*setter)(bool))
75​{
76​ QDBusMessage message = QDBusMessage::createMethodCall(s_fdoPowerService,
77​ s_fdoPowerPath,
78​ s_fdoPowerService,
79​ dbusName);
80​ QDBusPendingReply<bool> reply = QDBusConnection::sessionBus().asyncCall(message);
81​ QDBusPendingCallWatcher *callWatcher = new QDBusPendingCallWatcher(reply, q);
82​ QObject::connect(callWatcher, &QDBusPendingCallWatcher::finished, q,
83​ [this, setter](QDBusPendingCallWatcher *self) {
84​ QDBusPendingReply<bool> reply = *self;
85​ self->deleteLater();
86​ if (!reply.isValid()) {
87​ return;
88​ }
89​ ((this)->*setter)(reply.value());
90​ }
91​ );
92​
93​}
94​
95​void PowerManagement::Private::setCanHibernate(bool set)
96​{
97​ if (canHibernate == set) {
98​ return;
99​ }
100​ canHibernate = set;
101​ q->canHibernateChanged();
102​}
103​
104​void PowerManagement::Private::setCanSuspend(bool set)
105​{
106​ if (canSuspend == set) {
107​ return;
108​ }
109​ canSuspend = set;
110​ q->canSuspendChanged();
111​}
112​
113​PowerManagement *PowerManagement::instance()
114​{
115​ return s_instance;
116​}
117​
118​PowerManagement::PowerManagement()
119​ : QObject()
120​ , d(new Private(this))
121​{
122​ connect(d->fdoPowerServiceWatcher.data(), &QDBusServiceWatcher::serviceRegistered, this, [this] { d->update(); });
123​ connect(d->fdoPowerServiceWatcher.data(), &QDBusServiceWatcher::serviceUnregistered, this,
124​ [this] {
125​ d->serviceRegistered = false;
126​ d->setCanSuspend(false);
127​ d->setCanHibernate(false);
128​ }
129​ );
130​
131​ // check whether the service is registered
132​ QDBusMessage message = QDBusMessage::createMethodCall(QStringLiteral("org.freedesktop.DBus"),
133​ QStringLiteral("/"),
134​ QStringLiteral("org.freedesktop.DBus"),
135​ QStringLiteral("ListNames"));
136​ QDBusPendingReply<QStringList> async = QDBusConnection::sessionBus().asyncCall(message);
137​ QDBusPendingCallWatcher *callWatcher = new QDBusPendingCallWatcher(async, this);
138​ connect(callWatcher, &QDBusPendingCallWatcher::finished, this,
139​ [this](QDBusPendingCallWatcher *self) {
140​ QDBusPendingReply<QStringList> reply = *self;
141​ self->deleteLater();
142​ if (!reply.isValid()) {
143​ return;
144​ }
145​ if (reply.value().contains(s_fdoPowerService)) {
146​ d->update();
147​ }
148​ }
149​ );
150​}
151​
152​PowerManagement::~PowerManagement()
153​{
154​}
155​
156​void PowerManagement::suspend()
157​{
158​ if (!d->serviceRegistered) {
159​ return;
160​ }
161​ if (!d->canSuspend) {
162​ return;
163​ }
164​ QDBusMessage message = QDBusMessage::createMethodCall(s_fdoPowerService,
165​ s_fdoPowerPath,
166​ s_fdoPowerService,
167​ QStringLiteral("Suspend"));
168​ QDBusConnection::sessionBus().asyncCall(message);
169​}
170​
171​void PowerManagement::hibernate()
172​{
173​ if (!d->serviceRegistered) {
174​ return;
175​ }
176​ if (!d->canHibernate) {
177​ return;
178​ }
179​ QDBusMessage message = QDBusMessage::createMethodCall(s_fdoPowerService,
180​ s_fdoPowerPath,
181​ s_fdoPowerService,
182​ QStringLiteral("Hibernate"));
183​ QDBusConnection::sessionBus().asyncCall(message);
184​}
185​
186​bool PowerManagement::canSuspend() const
187​{
188​ return d->canSuspend;
189​}
190​
191​bool PowerManagement::canHibernate() const
192​{
193​ return d->canHibernate;
194​}
195​
196​} // namespace PowerDevil
197​
198​#include "powerdevilpowermanagement.moc"