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liblxqt-packaging/lxqtscreensaver.cpp

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/* BEGIN_COMMON_COPYRIGHT_HEADER
* (c)LGPL2+
*
* LXQt - a lightweight, Qt based, desktop toolset
* http://razor-qt.org
*
* Copyright: 2010-2011 Razor team
* Authors:
* Petr Vanek <petr@scribus.info>
* Copyright (c) 2016 Luís Pereira <luis.artur.pereira@gmail.com>
* Copyright (c) 2012 The Chromium Authors. All rights reserved.
*
* This program or library is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* END_COMMON_COPYRIGHT_HEADER */
#include <QProcess>
#include "lxqtscreensaver.h"
#include "lxqttranslator.h"
#include <memory>
#include <XdgIcon>
#include <QMessageBox>
#include <QAction>
#include <QPointer>
#include <QProcess>
#include <QCoreApplication> // for Q_DECLARE_TR_FUNCTIONS
#include <QX11Info>
#include <X11/extensions/scrnsaver.h>
// Avoid polluting everything with X11/Xlib.h:
typedef struct _XDisplay Display;
typedef unsigned long XAtom;
typedef unsigned long XID;
extern "C" {
int XFree(void*);
}
template <class T, class R, R (*F)(T*)>
struct XObjectDeleter {
inline void operator()(void* ptr) const { F(static_cast<T*>(ptr)); }
};
template <class T, class D = XObjectDeleter<void, int, XFree>>
using XScopedPtr = std::unique_ptr<T, D>;
namespace LXQt {
static bool GetProperty(XID window, const std::string& property_name, long max_length,
Atom* type, int* format, unsigned long* num_items,
unsigned char** property);
static bool GetIntArrayProperty(XID window,
const std::string& property_name,
std::vector<int>* value);
static bool GetProperty(XID window, const std::string& property_name, long max_length,
Atom* type, int* format, unsigned long* num_items,
unsigned char** property)
{
Atom property_atom = XInternAtom(QX11Info::display(), property_name.c_str(), false);
unsigned long remaining_bytes = 0;
return XGetWindowProperty(QX11Info::display(),
window,
property_atom,
0, // offset into property data to read
max_length, // max length to get
False, // deleted
AnyPropertyType,
type,
format,
num_items,
&remaining_bytes,
property);
}
static bool GetIntArrayProperty(XID window,
const std::string& property_name,
std::vector<int>* value)
{
Atom type = None;
int format = 0; // size in bits of each item in 'property'
unsigned long num_items = 0;
unsigned char* properties = NULL;
int result = GetProperty(window, property_name,
(~0L), // (all of them)
&type, &format, &num_items, &properties);
XScopedPtr<unsigned char> scoped_properties(properties);
if (result != Success)
return false;
if (format != 32)
return false;
long* int_properties = reinterpret_cast<long*>(properties);
value->clear();
for (unsigned long i = 0; i < num_items; ++i)
{
value->push_back(static_cast<int>(int_properties[i]));
}
return true;
}
class ScreenSaverPrivate
{
Q_DECLARE_TR_FUNCTIONS(LXQt::ScreenSaver);
Q_DECLARE_PUBLIC(ScreenSaver)
ScreenSaver* const q_ptr;
public:
ScreenSaverPrivate(ScreenSaver *q) : q_ptr(q) {};
void _l_xdgProcess_finished(int, QProcess::ExitStatus);
bool isScreenSaverLocked();
QPointer<QProcess> m_xdgProcess;
};
void ScreenSaverPrivate::_l_xdgProcess_finished(int err, QProcess::ExitStatus status)
{
// http://portland.freedesktop.org/xdg-utils-1.1.0-rc1/scripts/xdg-screensaver
Q_Q(ScreenSaver);
if (err == 0)
emit q->activated();
else
{
QMessageBox *box = new QMessageBox;
box->setAttribute(Qt::WA_DeleteOnClose);
box->setIcon(QMessageBox::Warning);
if (err == 1)
{
box->setWindowTitle(tr("Screen Saver Error"));
box->setText(tr("An error occurred starting screensaver. "
"Syntax error in xdg-screensaver arguments."));
}
else if (err == 3)
{
box->setWindowTitle(tr("Screen Saver Activation Error"));
box->setText(tr("An error occurred starting screensaver. "
"Ensure you have xscreensaver installed and running."));
}
else if (err == 4)
{
box->setWindowTitle(tr("Screen Saver Activation Error"));
box->setText(tr("An error occurred starting screensaver. "
"Action 'activate' failed. "
"Ensure you have xscreensaver installed and running."));
}
else
{
box->setWindowTitle(tr("Screen Saver Activation Error"));
box->setText(tr("An error occurred starting screensaver. "
"Unknown error - undocumented return value from xdg-screensaver: %1.")
.arg(err));
}
box->exec();
}
emit q->done();
}
bool ScreenSaverPrivate::isScreenSaverLocked()
{
XScreenSaverInfo *info = 0;
Display *display = QX11Info::display();
XID window = DefaultRootWindow(display);
info = XScreenSaverAllocInfo();
XScreenSaverQueryInfo(QX11Info::display(), window, info);
const int state = info->state;
XFree(info);
if (state == ScreenSaverOn)
return true;
// Ironically, xscreensaver does not conform to the XScreenSaver protocol, so
// info.state == ScreenSaverOff or info.state == ScreenSaverDisabled does not
// necessarily mean that a screensaver is not active, so add a special check
// for xscreensaver.
XAtom lock_atom = XInternAtom(display, "LOCK", false);
std::vector<int> atom_properties;
if (GetIntArrayProperty(window, "_SCREENSAVER_STATUS", &atom_properties) &&
atom_properties.size() > 0)
{
if (atom_properties[0] == static_cast<int>(lock_atom))
return true;
}
return false;
}
ScreenSaver::ScreenSaver(QObject * parent)
: QObject(parent),
d_ptr(new ScreenSaverPrivate(this))
{
Q_D(ScreenSaver);
d->m_xdgProcess = new QProcess(this);
connect(d->m_xdgProcess, SIGNAL(finished(int,QProcess::ExitStatus)),
this, SLOT(_l_xdgProcess_finished(int,QProcess::ExitStatus)));
}
ScreenSaver::~ScreenSaver()
{
delete d_ptr;
}
QList<QAction*> ScreenSaver::availableActions()
{
QList<QAction*> ret;
QAction * act;
act = new QAction(XdgIcon::fromTheme("system-lock-screen", "lock"), tr("Lock Screen"), this);
connect(act, SIGNAL(triggered()), this, SLOT(lockScreen()));
ret.append(act);
return ret;
}
void ScreenSaver::lockScreen()
{
Q_D(ScreenSaver);
if (!d->isScreenSaverLocked())
d->m_xdgProcess->start("xdg-screensaver", QStringList() << "lock");
}
} // namespace LXQt
#include "moc_lxqtscreensaver.cpp"