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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include <QtWidgets>
class RasterWindow : public QRasterWindow
{
Q_OBJECT
public:
RasterWindow(const QColor &color)
: m_color(color)
{
}
protected:
void paintEvent(QPaintEvent *)
{
QPainter p(this);
p.fillRect(QRect(0, 0, width(), height()), m_color);
}
private:
QColor m_color;
};
class ActivateButton : public QPushButton
{
Q_OBJECT
public:
ActivateButton(const QString &text, QWindow *window)
: QPushButton(text)
{
connect(this, &QPushButton::clicked, window, [window](){
window->requestActivate();
});
connect(window, &QWindow::activeChanged, this, [this, window](){
setPalette(window->isActive() ? QPalette(Qt::red) : qApp->palette());
});
}
};
class Controller : public QWidget
{
Q_OBJECT
public:
Controller() {
setWindowTitle("Controller window");
auto *ed1 = new QTextEdit;
ed1->setWindowTitle("Editor 1");
ed1->show();
auto *ed2 = new QTextEdit;
ed2->setWindowTitle("Editor 2");
ed2->show();
auto *win1 = new RasterWindow(Qt::red);
win1->setTitle("Window 1");
win1->resize(300, 200);
win1->show();
auto *win2 = new RasterWindow(Qt::green);
win2->setTitle("Window 2");
win2->resize(300, 200);
win2->show();
auto *noFocus = new RasterWindow(Qt::black);
noFocus->setTitle("No focus");
noFocus->resize(300, 200);
noFocus->setFlags(noFocus->flags() | Qt::WindowDoesNotAcceptFocus);
noFocus->show();
lab = new QLabel(this);
lab->move(5, 5);
connect(qApp, &QGuiApplication::focusObjectChanged, this, &Controller::updateInfo);
auto *topLayout = new QVBoxLayout(this);
topLayout->addWidget(lab);
topLayout->addWidget(new ActivateButton("Activate editor 1", ed1->windowHandle()));
topLayout->addWidget(new ActivateButton("Activate editor 2", ed2->windowHandle()));
topLayout->addWidget(new ActivateButton("Activate window 1", win1));
topLayout->addWidget(new ActivateButton("Activate window 2", win2));
topLayout->addStretch();
QPushButton *quitButton = new QPushButton("Quit");
topLayout->addWidget(quitButton);
connect(quitButton, &QPushButton::clicked, this, [](){
QApplication::quit();
});
resize(800, 600);
}
public slots:
void updateInfo() {
QString outString;
QWindow *fWin = QGuiApplication::focusWindow();
QString windowTitle = fWin ? fWin->title() : QString{};
QWidget *aWdg = QApplication::activeWindow();
QString widgetTitle = aWdg ? aWdg->windowTitle() : QString{};
QDebug(&outString) << "focus window" << fWin << windowTitle
<< "\nfocus object" << QGuiApplication::focusObject()
<< "\nfocus widget" << QApplication::focusWidget()
<< "\nactive widget" << aWdg << widgetTitle;
lab->setText(outString);
}
private:
QLabel *lab = nullptr;
};
int main(int argc, char **argv)
{
QApplication app(argc, argv);
Controller controller;
controller.show();
controller.updateInfo();
return app.exec();
}
#include "main.moc"
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