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/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtWidgets/QtWidgets>
#include <QtGui/qpa/qplatformscreen.h>
/*
DprGadget: The focused High-DPI settings debug utility
DprGadget displays the device pixel ratio ("DPR") for the screen
it's on in a large font, as well as the inputs (from the platform
plugin or environment) currently in use for determinging the DPR.
Non-relevant inputs are not displayed. See qttools/src/qtdiag for
an utility which displays all inputs.
*/
bool g_qtUsePhysicalDpi = false;
bool g_qtScaleFactor = false;
class DprGadget : public QWidget
{
public:
std::function<void(void)> m_clearFn;
std::function<void(void)> m_updateFn;
qreal m_currentDpr = -1;
DprGadget() {
setWindowTitle("DprGadget");
QFont smallFont;
smallFont.setPointSize(12);
QFont bigFont;
bigFont.setPointSize(42);
QFont biggerFont;
biggerFont.setPointSize(80);
QLabel *dprLabel = new QLabel("Device Pixel Ratio");
dprLabel->setFont(bigFont);
dprLabel->setTextInteractionFlags(Qt::TextSelectableByMouse);
QLabel *dprValue = new QLabel();
dprValue->setFont(biggerFont);
dprValue->setTextInteractionFlags(Qt::TextSelectableByMouse);
QLabel *dpiLabel = new QLabel("Logical DPI:");
dpiLabel->setFont(smallFont);
dpiLabel->setTextInteractionFlags(Qt::TextSelectableByMouse);
QLabel *sizeLabel = new QLabel("Window size:");
sizeLabel->setFont(smallFont);
sizeLabel->setTextInteractionFlags(Qt::TextSelectableByMouse);
QLabel *platformDpiLabel = new QLabel("Native Device Pixel Ratio:");
QLabel *plarformDprLabel = new QLabel("Native Logical DPI:");
platformDpiLabel->setFont(smallFont);
platformDpiLabel->setTextInteractionFlags(Qt::TextSelectableByMouse);
plarformDprLabel->setFont(smallFont);
plarformDprLabel->setTextInteractionFlags(Qt::TextSelectableByMouse);
QLabel *screenLabel = new QLabel("Current Screen:");
screenLabel->setFont(smallFont);
QVBoxLayout *layout = new QVBoxLayout();
layout->addWidget(dprLabel);
layout->setAlignment(dprLabel, Qt::AlignHCenter);
layout->addWidget(dprValue);
layout->setAlignment(dprValue, Qt::AlignHCenter);
layout->addWidget(sizeLabel);
bool displayLogicalDpi = false;
if (displayLogicalDpi)
layout->addWidget(dpiLabel);
if (g_qtScaleFactor) {
QString text = QString("QT_SCALE_FACTOR ") + qgetenv("QT_SCALE_FACTOR");
layout->addWidget(new QLabel(text));
}
layout->addStretch();
layout->addWidget(screenLabel);
layout->addWidget(platformDpiLabel);
layout->addWidget(plarformDprLabel);
auto updateValues = [=]() {
dprValue->setText(QString("%1").arg(devicePixelRatioF()));
dpiLabel->setText(QString("Logical DPI: %1").arg(logicalDpiX()));
sizeLabel->setText(QString("Window size: %1 %2").arg(width()).arg(height()));
QPlatformScreen *pscreen = screen()->handle();
if (g_qtUsePhysicalDpi)
platformDpiLabel->setText(QString("Native Physical DPI: TODO"));
else
platformDpiLabel->setText(QString("Native Logical DPI: %1").arg(pscreen->logicalDpi().first));
plarformDprLabel->setText(QString("Native Device Pixel Ratio: %1").arg(pscreen->devicePixelRatio()));
screenLabel->setText(QString("Current Screen: %1").arg(screen()->name()));
};
m_updateFn = updateValues;
m_clearFn = [=]() {
dprValue->setText(QString(""));
};
create();
QObject::connect(this->windowHandle(), &QWindow::screenChanged, [updateValues](QScreen *screen){
Q_UNUSED(screen);
updateValues();
});
setLayout(layout);
updateValues();
}
void paintEvent(QPaintEvent *) override {
// Dpr change should trigger a repaint, update display values here
if (m_currentDpr == devicePixelRatioF())
return;
m_currentDpr = devicePixelRatioF();
m_updateFn();
}
void resizeEvent(QResizeEvent *) override {
m_updateFn();
}
void mousePressEvent(QMouseEvent *) override {
m_clearFn();
QTimer::singleShot(500, this, [this](){
m_updateFn();
});
}
};
int main(int argc, char **argv) {
// Set sensible defaults
QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
QGuiApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::PassThrough);
// react to (some) high-dpi eviornment variables.
g_qtUsePhysicalDpi = qgetenv("QT_USE_PHYSICAL_DPI") == QByteArray("1");
g_qtScaleFactor = qEnvironmentVariableIsSet("QT_SCALE_FACTOR");
QApplication app(argc, argv);
DprGadget dprGadget;
// Set initial size. We expect this size to be preserved across screen
// and DPI changes
dprGadget.resize(560, 380);
dprGadget.show();
return app.exec();
}
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