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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#undef QT_NO_FOREACH // this file contains unported legacy Q_FOREACH uses
#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>
#include <QPushButton>
#include <QLabel>
#include <QMouseEvent>
class MouseMonitor : public QLabel {
Q_OBJECT
public:
MouseMonitor() : m_grabbed(false) {
setMinimumSize(540, 240);
setAlignment(Qt::AlignCenter);
setMouseTracking(true);
setWindowTitle(QLatin1String("Mouse Monitor"));
updateText();
}
void updateText() {
QString txt = m_grabbed ?
QLatin1String("Left-click to test QGuiApplication::topLevelAt(click pos)\nRight-click to ungrab\n") :
QLatin1String("Left-click to grab mouse\n");
if (!m_cursorPos.isNull()) {
const auto screen = QGuiApplication::screenAt(m_cursorPos);
const auto screenNum = screen ? QGuiApplication::screens().indexOf(screen) : 0;
txt += QString(QLatin1String("Current mouse position: %1, %2 on screen %3\n"))
.arg(m_cursorPos.x()).arg(m_cursorPos.y()).arg(screenNum);
if (QGuiApplication::mouseButtons() & Qt::LeftButton) {
QWindow *win = QGuiApplication::topLevelAt(m_cursorPos);
txt += QString(QLatin1String("Top-level window found? %1\n"))
.arg(win ? (win->title().isEmpty() ? "no title" : win->title()) : "none");
}
}
setText(txt);
}
protected:
void mouseMoveEvent(QMouseEvent *ev) override {
m_cursorPos = ev->screenPos().toPoint();
updateText();
}
void mousePressEvent(QMouseEvent *ev) override {
m_cursorPos = ev->screenPos().toPoint();
qDebug() << "top level @" << m_cursorPos << ":" << QGuiApplication::topLevelAt(m_cursorPos);
updateText();
if (!m_grabbed) {
grabMouse(Qt::CrossCursor);
m_grabbed = true;
} else if (ev->button() == Qt::RightButton) {
setVisible(false);
deleteLater();
}
}
private:
QPoint m_cursorPos;
bool m_grabbed;
};
class ScreenPropertyWatcher : public PropertyWatcher
{
Q_OBJECT
public:
ScreenPropertyWatcher(QWidget *wp = nullptr) : PropertyWatcher(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) override;
void startMouseMonitor();
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()));
QMenu *toolsMenu = menuBar()->addMenu(QLatin1String("&Tools"));
a = toolsMenu->addAction(QLatin1String("Mouse Monitor"));
a->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_M));
connect(a, &QAction::triggered, this, &ScreenWatcherMainWindow::startMouseMonitor);
}
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();
if (!newScreen) {
result = QLatin1String("Screen changed --> null");
} else if (!oldScreen) {
QTextStream(&result) << "Screen changed null --> \"" << newScreen->name() << "\" at "
<< pos.x() << ',' << pos.y() << " geometry: " << geometry.width()
<< 'x' << geometry.height() << Qt::forcesign << geometry.x()
<< geometry.y() << '.';
} else {
QTextStream(&result) << "Screen changed \"" << oldScreen->name() << "\" --> \""
<< newScreen->name() << "\" at " << pos.x() << ',' << pos.y()
<< " geometry: " << geometry.width() << 'x' << geometry.height()
<< Qt::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 ScreenWatcherMainWindow::startMouseMonitor()
{
MouseMonitor *mm = new MouseMonitor();
mm->show();
}
void screenAdded(QScreen* screen)
{
qDebug("\nscreenAdded %s siblings %d fast %s", qPrintable(screen->name()), screen->virtualSiblings().count(),
(screen->virtualSiblings().isEmpty() ? "none" : qPrintable(screen->virtualSiblings().first()->name())));
ScreenWatcherMainWindow *w = new ScreenWatcherMainWindow(screen);
w->setScreen(screen);
w->show();
// Position the windows so that they end up at the center of the corresponding screen.
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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