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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "propertywatcher.h"
#include <QApplication>
#include <QScreen>
#include <QWindow>
#include <QDebug>
#include <QTextStream>
#include <QFormLayout>
#include <QMainWindow>
#include <QMenu>
#include <QMenuBar>
#include <QAction>
#include <QStatusBar>
#include <QLineEdit>
class ScreenPropertyWatcher : public PropertyWatcher
{
Q_OBJECT
public:
ScreenPropertyWatcher(QWidget *wp = Q_NULLPTR) : PropertyWatcher(Q_NULLPTR, QString(), wp)
{
// workaround for the fact that virtualSiblings is not a property,
// thus there is no change notification:
// allow the user to update the field manually
connect(this, &PropertyWatcher::updatedAllFields, this, &ScreenPropertyWatcher::updateSiblings);
}
QScreen *screenSubject() const { return qobject_cast<QScreen *>(subject()); }
void setScreenSubject(QScreen *s, const QString &annotation = QString())
{
setSubject(s, annotation);
updateSiblings();
}
public slots:
void updateSiblings();
};
void ScreenPropertyWatcher::updateSiblings()
{
const QScreen *screen = screenSubject();
if (!screen)
return;
const QString objectName = QLatin1String("siblings");
QLineEdit *siblingsField = findChild<QLineEdit *>(objectName);
if (!siblingsField) {
siblingsField = new QLineEdit(this);
siblingsField->setObjectName(objectName);
siblingsField->setReadOnly(true);
formLayout()->insertRow(0, QLatin1String("virtualSiblings"), siblingsField);
}
QString text;
foreach (const QScreen *sibling, screen->virtualSiblings()) {
if (!text.isEmpty())
text += QLatin1String(", ");
text += sibling->name();
}
siblingsField->setText(text);
}
class ScreenWatcherMainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit ScreenWatcherMainWindow(QScreen *screen);
QScreen *screenSubject() const { return m_watcher->screenSubject(); }
protected:
bool event(QEvent *event) Q_DECL_OVERRIDE;
private:
const QString m_annotation;
ScreenPropertyWatcher *m_watcher;
};
static int i = 0;
ScreenWatcherMainWindow::ScreenWatcherMainWindow(QScreen *screen)
: m_annotation(QLatin1Char('#') + QString::number(i++))
, m_watcher(new ScreenPropertyWatcher(this))
{
setAttribute(Qt::WA_DeleteOnClose);
setCentralWidget(m_watcher);
m_watcher->setScreenSubject(screen, m_annotation);
QMenu *fileMenu = menuBar()->addMenu(QLatin1String("&File"));
QAction *a = fileMenu->addAction(QLatin1String("Close"));
a->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_W));
connect(a, SIGNAL(triggered()), this, SLOT(close()));
a = fileMenu->addAction(QLatin1String("Quit"));
a->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_Q));
connect(a, SIGNAL(triggered()), qApp, SLOT(quit()));
}
static inline QString msgScreenChange(const QWidget *w, const QScreen *oldScreen, const QScreen *newScreen)
{
QString result;
const QRect geometry = w->geometry();
const QPoint pos = QCursor::pos();
QTextStream(&result) << "Screen changed \"" << oldScreen->name() << "\" --> \""
<< newScreen->name() << "\" at " << pos.x() << ',' << pos.y() << " geometry: "
<< geometry.width() << 'x' << geometry.height() << forcesign << geometry.x()
<< geometry.y() << '.';
return result;
}
bool ScreenWatcherMainWindow::event(QEvent *event)
{
if (event->type() == QEvent::ScreenChangeInternal) {
QScreen *newScreen = windowHandle()->screen();
const QString message = msgScreenChange(this, m_watcher->screenSubject(), newScreen);
qDebug().noquote() << message;
statusBar()->showMessage(message);
m_watcher->setScreenSubject(newScreen, m_annotation);
}
return QMainWindow::event(event);
}
void screenAdded(QScreen* screen)
{
screen->setOrientationUpdateMask((Qt::ScreenOrientations)0x0F);
qDebug("\nscreenAdded %s siblings %d first %s", qPrintable(screen->name()), screen->virtualSiblings().count(),
(screen->virtualSiblings().isEmpty() ? "none" : qPrintable(screen->virtualSiblings().first()->name())));
ScreenWatcherMainWindow *w = new ScreenWatcherMainWindow(screen);
// This doesn't work. If the multiple screens are part of
// a virtual desktop (i.e. they are virtual siblings), then
// setScreen has no effect, and we need the code below to
// change the window geometry. If on the other hand the
// screens are really separate, so that windows are not
// portable between them, XCreateWindow needs to have not just
// a different root Window but also a different Display, in order to
// put the window on the other screen. That would require a
// different QXcbConnection. So this setScreen call doesn't seem useful.
//w->windowHandle()->setScreen(screen);
// But this works as long as the screens are all virtual siblings
w->show();
QRect geom = w->geometry();
geom.setSize(w->sizeHint());
if (geom.height() > screen->geometry().height())
geom.setHeight(screen->geometry().height() * 9 / 10);
geom.moveCenter(screen->geometry().center());
w->setGeometry(geom);
}
void screenRemoved(QScreen* screen)
{
const QWidgetList topLevels = QApplication::topLevelWidgets();
for (int i = topLevels.size() - 1; i >= 0; --i) {
if (ScreenWatcherMainWindow *sw = qobject_cast<ScreenWatcherMainWindow *>(topLevels.at(i))) {
if (sw->screenSubject() == screen)
sw->close();
}
}
}
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QList<QScreen *> screens = QGuiApplication::screens();
foreach (QScreen *screen, screens)
screenAdded(screen);
QObject::connect((const QGuiApplication*)QGuiApplication::instance(), &QGuiApplication::screenAdded, &screenAdded);
QObject::connect((const QGuiApplication*)QGuiApplication::instance(), &QGuiApplication::screenRemoved, &screenRemoved);
return a.exec();
}
#include "main.moc"
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