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qt5base-lts/tests/manual/highdpi/main.cpp
Morten Johan Sørvig 3e5362bfa1 HighDPI: Add “metrics” manual test 
This test displays a summary of relevant DPI and scale
factor/devicePixelRatio values:

 - DPI and DPR as seen by the application
 - Input from QPlatformScreen
 - Input from environment variables.

Task-number: QTBUG-53022
Change-Id: I340391624b202e342f22902ffbd7228fe7fbe94b
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
2019-08-23 03:40:43 +02:00

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/****************************************************************************
**
** Copyright (C) 2016 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 <QMainWindow>
#include <QMenuBar>
#include <QLabel>
#include <QHBoxLayout>
#include <QApplication>
#include <QAction>
#include <QStyle>
#include <QToolBar>
#include <QPushButton>
#include <QButtonGroup>
#include <QLineEdit>
#include <QPlainTextEdit>
#include <QScrollBar>
#include <QSlider>
#include <QSpinBox>
#include <QTabBar>
#include <QTextBrowser>
#include <QIcon>
#include <QPainter>
#include <QWindow>
#include <QScreen>
#include <QGraphicsView>
#include <QGraphicsTextItem>
#include <QFile>
#include <QMouseEvent>
#include <QTemporaryDir>
#include <QTimer>
#include <QCommandLineParser>
#include <QCommandLineOption>
#include <QDebug>
#include <private/qhighdpiscaling_p.h>
#include <qpa/qplatformscreen.h>
#include "dragwidget.h"
static QTextStream &operator<<(QTextStream &str, const QRect &r)
{
str << r.width() << 'x' << r.height() << forcesign << r.x() << r.y() << noforcesign;
return str;
}
class DemoContainerBase
{
public:
DemoContainerBase() : m_widget(nullptr) {}
virtual ~DemoContainerBase() {}
QString name() { return option().names().first(); }
virtual QCommandLineOption &option() = 0;
virtual void makeVisible(bool visible, QWidget *parent) = 0;
QWidget *widget() { return m_widget; }
protected:
QWidget *m_widget;
};
typedef QList<DemoContainerBase*> DemoContainerList ;
template <class T>
class DemoContainer : public DemoContainerBase
{
public:
DemoContainer(const QString &optionName, const QString &description)
: m_option(optionName, description)
{
}
~DemoContainer() { delete m_widget; }
QCommandLineOption &option() { return m_option; }
void makeVisible(bool visible, QWidget *parent) {
if (visible && !m_widget) {
m_widget = new T;
m_widget->installEventFilter(parent);
}
if (m_widget)
m_widget->setVisible(visible);
}
private:
QCommandLineOption m_option;
};
class LabelSlider : public QObject
{
Q_OBJECT
public:
LabelSlider(QObject *parent, const QString &text, QGridLayout *layout, int row)
: QObject(parent)
{
QLabel *textLabel = new QLabel(text);
m_slider = new QSlider();
m_slider->setOrientation(Qt::Horizontal);
m_slider->setMinimum(1);
m_slider->setMaximum(40);
m_slider->setValue(10);
m_slider->setTracking(false);
m_slider->setTickInterval(5);
m_slider->setTickPosition(QSlider::TicksBelow);
m_label = new QLabel("1.0");
// set up layouts
layout->addWidget(textLabel, row, 0);
layout->addWidget(m_slider, row, 1);
layout->addWidget(m_label, row, 2);
// handle slider position change
connect(m_slider, &QSlider::sliderMoved, this, &LabelSlider::updateLabel);
connect(m_slider, &QSlider::valueChanged, this, &LabelSlider::valueChanged);
}
void setValue(int scaleFactor) {
m_slider->setValue(scaleFactor);
updateLabel(scaleFactor);
}
private slots:
void updateLabel(int scaleFactor) {
// slider value is scale factor times ten;
qreal scalefactorF = qreal(scaleFactor) / 10.0;
// update label, add ".0" if needed.
QString number = QString::number(scalefactorF);
if (!number.contains(QLatin1Char('.')))
number.append(".0");
m_label->setText(number);
}
signals:
void valueChanged(int scaleFactor);
private:
QSlider *m_slider;
QLabel *m_label;
};
static qreal getScreenFactorWithoutPixelDensity(const QScreen *screen)
{
// this is a hack that relies on knowing the internals of QHighDpiScaling
static const char *scaleFactorProperty = "_q_scaleFactor";
QVariant screenFactor = screen->property(scaleFactorProperty);
return screenFactor.isValid() ? screenFactor.toReal() : 1.0;
}
static inline qreal getGlobalScaleFactor()
{
QScreen *noScreen = nullptr;
return QHighDpiScaling::factor(noScreen);
}
class DemoController : public QWidget
{
Q_OBJECT
public:
DemoController(DemoContainerList *demos, QCommandLineParser *parser);
~DemoController();
protected:
bool eventFilter(QObject *object, QEvent *event);
void closeEvent(QCloseEvent *) { qApp->quit(); }
private slots:
void handleButton(int id, bool toggled);
private:
DemoContainerList *m_demos;
QButtonGroup *m_group;
};
DemoController::DemoController(DemoContainerList *demos, QCommandLineParser *parser)
: m_demos(demos)
{
setWindowTitle("screen scale factors");
setObjectName("controller"); // make WindowScaleFactorSetter skip this window
QGridLayout *layout = new QGridLayout;
setLayout(layout);
int layoutRow = 0;
LabelSlider *globalScaleSlider = new LabelSlider(this, "Global scale factor", layout, layoutRow++);
globalScaleSlider->setValue(int(getGlobalScaleFactor() * 10));
connect(globalScaleSlider, &LabelSlider::valueChanged, [](int scaleFactor){
// slider value is scale factor times ten;
qreal scalefactorF = qreal(scaleFactor) / 10.0;
QHighDpiScaling::setGlobalFactor(scalefactorF);
});
// set up one scale control line per screen
QList<QScreen *> screens = QGuiApplication::screens();
foreach (QScreen *screen, screens) {
// create scale control line
QSize screenSize = screen->geometry().size();
QString screenId = screen->name() + QLatin1Char(' ') + QString::number(screenSize.width())
+ QLatin1Char(' ') + QString::number(screenSize.height());
LabelSlider *slider = new LabelSlider(this, screenId, layout, layoutRow++);
slider->setValue(getScreenFactorWithoutPixelDensity(screen) * 10);
// handle slider value change
connect(slider, &LabelSlider::valueChanged, [screen](int scaleFactor){
// slider value is scale factor times ten;
qreal scalefactorF = qreal(scaleFactor) / 10.0;
// set scale factor for screen
qreal oldFactor = QHighDpiScaling::factor(screen);
QHighDpiScaling::setScreenFactor(screen, scalefactorF);
qreal newFactor = QHighDpiScaling::factor(screen);
qDebug() << "factor was / is" << oldFactor << newFactor;
});
}
m_group = new QButtonGroup(this);
m_group->setExclusive(false);
for (int i = 0; i < m_demos->size(); ++i) {
DemoContainerBase *demo = m_demos->at(i);
QPushButton *button = new QPushButton(demo->name());
button->setToolTip(demo->option().description());
button->setCheckable(true);
layout->addWidget(button, layoutRow++, 0, 1, -1);
m_group->addButton(button, i);
if (parser->isSet(demo->option())) {
demo->makeVisible(true, this);
button->setChecked(true);
}
}
connect(m_group, SIGNAL(buttonToggled(int, bool)), this, SLOT(handleButton(int, bool)));
}
DemoController::~DemoController()
{
qDeleteAll(*m_demos);
}
bool DemoController::eventFilter(QObject *object, QEvent *event)
{
if (event->type() == QEvent::Close) {
for (int i = 0; i < m_demos->size(); ++i) {
DemoContainerBase *demo = m_demos->at(i);
if (demo->widget() == object) {
m_group->button(i)->setChecked(false);
break;
}
}
}
return false;
}
void DemoController::handleButton(int id, bool toggled)
{
m_demos->at(id)->makeVisible(toggled, this);
}
class PixmapPainter : public QWidget
{
public:
PixmapPainter();
void paintEvent(QPaintEvent *event);
QPixmap pixmap1X;
QPixmap pixmap2X;
QPixmap pixmapLarge;
QImage image1X;
QImage image2X;
QImage imageLarge;
QIcon qtIcon;
};
PixmapPainter::PixmapPainter()
{
pixmap1X = QPixmap(":/qticon32.png");
pixmap2X = QPixmap(":/qticon32@2x.png");
pixmapLarge = QPixmap(":/qticon64.png");
image1X = QImage(":/qticon32.png");
image2X = QImage(":/qticon32@2x.png");
imageLarge = QImage(":/qticon64.png");
qtIcon.addFile(":/qticon32.png");
qtIcon.addFile(":/qticon32@2x.png");
}
void PixmapPainter::paintEvent(QPaintEvent *)
{
QPainter p(this);
p.fillRect(QRect(QPoint(0, 0), size()), QBrush(Qt::gray));
int pixmapPointSize = 32;
int y = 30;
int dy = 90;
int x = 10;
int dx = 40;
// draw at point
// qDebug() << "paint pixmap" << pixmap1X.devicePixelRatio();
p.drawPixmap(x, y, pixmap1X);
x+=dx;p.drawPixmap(x, y, pixmap2X);
x+=dx;p.drawPixmap(x, y, pixmapLarge);
x+=dx*2;p.drawPixmap(x, y, qtIcon.pixmap(QSize(pixmapPointSize, pixmapPointSize)));
x+=dx;p.drawImage(x, y, image1X);
x+=dx;p.drawImage(x, y, image2X);
x+=dx;p.drawImage(x, y, imageLarge);
// draw at 32x32 rect
y+=dy;
x = 10;
p.drawPixmap(QRect(x, y, pixmapPointSize, pixmapPointSize), pixmap1X);
x+=dx;p.drawPixmap(QRect(x, y, pixmapPointSize, pixmapPointSize), pixmap2X);
x+=dx;p.drawPixmap(QRect(x, y, pixmapPointSize, pixmapPointSize), pixmapLarge);
x+=dx;p.drawPixmap(QRect(x, y, pixmapPointSize, pixmapPointSize), qtIcon.pixmap(QSize(pixmapPointSize, pixmapPointSize)));
x+=dx;p.drawImage(QRect(x, y, pixmapPointSize, pixmapPointSize), image1X);
x+=dx;p.drawImage(QRect(x, y, pixmapPointSize, pixmapPointSize), image2X);
x+=dx;p.drawImage(QRect(x, y, pixmapPointSize, pixmapPointSize), imageLarge);
// draw at 64x64 rect
y+=dy - 50;
x = 10;
p.drawPixmap(QRect(x, y, pixmapPointSize * 2, pixmapPointSize * 2), pixmap1X);
x+=dx * 2; p.drawPixmap(QRect(x, y, pixmapPointSize * 2, pixmapPointSize * 2), pixmap2X);
x+=dx * 2; p.drawPixmap(QRect(x, y, pixmapPointSize * 2, pixmapPointSize * 2), pixmapLarge);
x+=dx * 2; p.drawPixmap(QRect(x, y, pixmapPointSize * 2, pixmapPointSize * 2), qtIcon.pixmap(QSize(pixmapPointSize, pixmapPointSize)));
x+=dx * 2; p.drawImage(QRect(x, y, pixmapPointSize * 2, pixmapPointSize * 2), image1X);
x+=dx * 2; p.drawImage(QRect(x, y, pixmapPointSize * 2, pixmapPointSize * 2), image2X);
x+=dx * 2; p.drawImage(QRect(x, y, pixmapPointSize * 2, pixmapPointSize * 2), imageLarge);
}
class TiledPixmapPainter : public QWidget
{
public:
QPixmap pixmap1X;
QPixmap pixmap2X;
QPixmap pixmapLarge;
TiledPixmapPainter();
void paintEvent(QPaintEvent *event);
};
TiledPixmapPainter::TiledPixmapPainter()
{
pixmap1X = QPixmap(":/qticon32.png");
pixmap2X = QPixmap(":/qticon32@2x.png");
pixmapLarge = QPixmap(":/qticon64.png");
}
void TiledPixmapPainter::paintEvent(QPaintEvent *event)
{
Q_UNUSED(event);
QPainter p(this);
int xoff = 10;
int yoff = 10;
int tiles = 4;
int pixmapEdge = 32;
int tileAreaEdge = pixmapEdge * tiles;
// Expected behavior for both 1x and 2x dislays:
// 1x pixmap : 4 x 4 tiles
// large pixmap: 2 x 2 tiles
// 2x pixmap : 4 x 4 tiles
//
// On a 2x display the 2x pimxap tiles
// will be drawn in high resolution.
p.drawTiledPixmap(QRect(xoff, yoff, tileAreaEdge, tileAreaEdge), pixmap1X);
yoff += tiles * pixmapEdge + 10;
p.drawTiledPixmap(QRect(xoff, yoff, tileAreaEdge, tileAreaEdge), pixmapLarge);
yoff += tiles * pixmapEdge + 10;
p.drawTiledPixmap(QRect(xoff, yoff, tileAreaEdge, tileAreaEdge), pixmap2X);
// Again, with an offset. The offset is in
// device-independent pixels.
QPoint offset(40, 40); // larger than the pixmap edge size to exercise that code path
yoff = 10;
xoff = 20 + tiles * pixmapEdge ;
p.drawTiledPixmap(QRect(xoff, yoff, tileAreaEdge, tileAreaEdge), pixmap1X, offset);
yoff += tiles * pixmapEdge + 10;
p.drawTiledPixmap(QRect(xoff, yoff, tileAreaEdge, tileAreaEdge), pixmapLarge, offset);
yoff += tiles * pixmapEdge + 10;
p.drawTiledPixmap(QRect(xoff, yoff, tileAreaEdge, tileAreaEdge), pixmap2X, offset);
}
class Labels : public QWidget
{
public:
Labels();
QPixmap pixmap1X;
QPixmap pixmap2X;
QPixmap pixmapLarge;
QIcon qtIcon;
};
Labels::Labels()
{
pixmap1X = QPixmap(":/qticon32.png");
pixmap2X = QPixmap(":/qticon32@2x.png");
pixmapLarge = QPixmap(":/qticon64.png");
qtIcon.addFile(":/qticon32.png");
qtIcon.addFile(":/qticon32@2x.png");
setWindowIcon(qtIcon);
setWindowTitle("Labels");
QLabel *label1x = new QLabel();
label1x->setPixmap(pixmap1X);
QLabel *label2x = new QLabel();
label2x->setPixmap(pixmap2X);
QLabel *labelIcon = new QLabel();
labelIcon->setPixmap(qtIcon.pixmap(QSize(32,32)));
QLabel *labelLarge = new QLabel();
labelLarge->setPixmap(pixmapLarge);
QHBoxLayout *layout = new QHBoxLayout(this);
layout->addWidget(label1x); //expected low-res on high-dpi displays
layout->addWidget(label2x); //expected high-res on high-dpi displays
layout->addWidget(labelIcon); //expected high-res on high-dpi displays
layout->addWidget(labelLarge); // expected large size and low-res
setLayout(layout);
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow();
QMenu *addNewMenu(const QString &title, int itemCount = 5);
private slots:
void maskActionToggled(bool t);
private:
QIcon qtIcon;
QIcon qtIcon1x;
QIcon qtIcon2x;
QToolBar *fileToolBar;
int menuCount;
QAction *m_maskAction;
};
MainWindow::MainWindow()
:menuCount(0)
{
// beware that QIcon auto-loads the @2x versions.
qtIcon1x.addFile(":/qticon16.png");
qtIcon2x.addFile(":/qticon32.png");
setWindowIcon(qtIcon);
setWindowTitle("MainWindow");
fileToolBar = addToolBar(tr("File"));
// fileToolBar->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
fileToolBar->addAction(new QAction(qtIcon1x, QString("1x"), this));
fileToolBar->addAction(new QAction(qtIcon2x, QString("2x"), this));
addNewMenu("&Edit");
addNewMenu("&Build");
addNewMenu("&Debug", 4);
QMenu *menu = addNewMenu("&Transmogrify", 7);
menu->addSeparator();
m_maskAction = menu->addAction("Mask");
m_maskAction->setCheckable(true);
connect(m_maskAction, &QAction::toggled, this, &MainWindow::maskActionToggled);
fileToolBar->addAction(m_maskAction);
addNewMenu("T&ools");
addNewMenu("&Help", 2);
}
QMenu *MainWindow::addNewMenu(const QString &title, int itemCount)
{
QMenu *menu = menuBar()->addMenu(title);
for (int i = 0; i < itemCount; i++) {
menuCount++;
QString s = "Menu item " + QString::number(menuCount);
if (i == 3) {
QMenu *subMenu = menu->addMenu(s);
for (int j = 1; j < 4; j++)
subMenu->addAction(QString::fromLatin1("SubMenu item %1.%2").arg(menuCount).arg(j));
} else {
menu->addAction(s);
}
}
return menu;
}
void MainWindow::maskActionToggled(bool t)
{
if (t) {
QVector<QPoint> upperLeftTriangle;
upperLeftTriangle << QPoint(0, 0) << QPoint(width(), 0) << QPoint(0, height());
setMask(QRegion(QPolygon(upperLeftTriangle)));
} else {
clearMask();
}
}
class StandardIcons : public QWidget
{
public:
void paintEvent(QPaintEvent *)
{
int x = 10;
int y = 10;
int dx = 50;
int dy = 50;
int maxX = 500;
for (uint iconIndex = QStyle::SP_TitleBarMenuButton; iconIndex < QStyle::SP_MediaVolumeMuted; ++iconIndex) {
QIcon icon = qApp->style()->standardIcon(QStyle::StandardPixmap(iconIndex));
QPainter p(this);
p.drawPixmap(x, y, icon.pixmap(dx - 5, dy - 5));
if (x + dx > maxX)
y+=dy;
x = ((x + dx) % maxX);
}
}
};
class Caching : public QWidget
{
public:
void paintEvent(QPaintEvent *)
{
QSize layoutSize(75, 75);
QPainter widgetPainter(this);
widgetPainter.fillRect(QRect(QPoint(0, 0), this->size()), Qt::gray);
{
const qreal devicePixelRatio = this->windowHandle()->devicePixelRatio();
QPixmap cache(layoutSize * devicePixelRatio);
cache.setDevicePixelRatio(devicePixelRatio);
QPainter cachedPainter(&cache);
cachedPainter.fillRect(QRect(0,0, 75, 75), Qt::blue);
cachedPainter.fillRect(QRect(10,10, 55, 55), Qt::red);
cachedPainter.drawEllipse(QRect(10,10, 55, 55));
QPainter widgetPainter(this);
widgetPainter.drawPixmap(QPoint(10, 10), cache);
}
{
const qreal devicePixelRatio = this->windowHandle()->devicePixelRatio();
QImage cache = QImage(layoutSize * devicePixelRatio, QImage::Format_ARGB32_Premultiplied);
cache.setDevicePixelRatio(devicePixelRatio);
QPainter cachedPainter(&cache);
cachedPainter.fillRect(QRect(0,0, 75, 75), Qt::blue);
cachedPainter.fillRect(QRect(10,10, 55, 55), Qt::red);
cachedPainter.drawEllipse(QRect(10,10, 55, 55));
QPainter widgetPainter(this);
widgetPainter.drawImage(QPoint(95, 10), cache);
}
}
};
class Style : public QWidget {
public:
QPushButton *button;
QLineEdit *lineEdit;
QSlider *slider;
QHBoxLayout *row1;
Style() {
row1 = new QHBoxLayout();
setLayout(row1);
button = new QPushButton();
button->setText("Test Button");
row1->addWidget(button);
lineEdit = new QLineEdit();
lineEdit->setText("Test Lineedit");
row1->addWidget(lineEdit);
slider = new QSlider();
row1->addWidget(slider);
row1->addWidget(new QSpinBox);
row1->addWidget(new QScrollBar);
QTabBar *tab = new QTabBar();
tab->addTab("Foo");
tab->addTab("Bar");
row1->addWidget(tab);
}
};
class Fonts : public QWidget
{
public:
void paintEvent(QPaintEvent *)
{
QPainter painter(this);
// Points
int y = 10;
for (int fontSize = 6; fontSize < 18; fontSize += 2) {
QFont font;
font.setPointSize(fontSize);
QString string = QString(QStringLiteral("This text is in point size %1")).arg(fontSize);
painter.setFont(font);
y += (painter.fontMetrics().lineSpacing());
painter.drawText(10, y, string);
}
// Pixels
y += painter.fontMetrics().lineSpacing();
for (int fontSize = 6; fontSize < 18; fontSize += 2) {
QFont font;
font.setPixelSize(fontSize);
QString string = QString(QStringLiteral("This text is in pixel size %1")).arg(fontSize);
painter.setFont(font);
y += (painter.fontMetrics().lineSpacing());
painter.drawText(10, y, string);
}
}
};
template <typename T>
void apiTestdevicePixelRatioGetter()
{
if (0) {
T *t = nullptr;
t->devicePixelRatio();
}
}
template <typename T>
void apiTestdevicePixelRatioSetter()
{
if (0) {
T *t = nullptr;
t->setDevicePixelRatio(2.0);
}
}
void apiTest()
{
// compile call to devicePixelRatio getter and setter (verify spelling)
apiTestdevicePixelRatioGetter<QWindow>();
apiTestdevicePixelRatioGetter<QScreen>();
apiTestdevicePixelRatioGetter<QGuiApplication>();
apiTestdevicePixelRatioGetter<QImage>();
apiTestdevicePixelRatioSetter<QImage>();
apiTestdevicePixelRatioGetter<QPixmap>();
apiTestdevicePixelRatioSetter<QPixmap>();
}
// Request and draw an icon at different sizes
class IconDrawing : public QWidget
{
public:
IconDrawing()
{
const QString tempPath = m_temporaryDir.path();
const QString path32 = tempPath + "/qticon32.png";
const QString path32_2 = tempPath + "/qticon32-2.png";
const QString path32_2x = tempPath + "/qticon32@2x.png";
QFile::copy(":/qticon32.png", path32_2);
QFile::copy(":/qticon32.png", path32);
QFile::copy(":/qticon32@2x.png", path32_2x);
iconHighDPI.reset(new QIcon(path32)); // will auto-load @2x version.
iconNormalDpi.reset(new QIcon(path32_2)); // does not have a 2x version.
}
void paintEvent(QPaintEvent *)
{
int x = 10;
int y = 10;
int dx = 50;
int dy = 50;
int maxX = 600;
int minSize = 5;
int maxSize = 64;
int sizeIncrement = 5;
// Disable high-dpi icons
QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps, false);
// normal icon
for (int size = minSize; size < maxSize; size += sizeIncrement) {
QPainter p(this);
p.drawPixmap(x, y, iconNormalDpi->pixmap(size, size));
if (x + dx > maxX)
y+=dy;
x = ((x + dx) % maxX);
}
x = 10;
y+=dy;
// high-dpi icon
for (int size = minSize; size < maxSize; size += sizeIncrement) {
QPainter p(this);
p.drawPixmap(x, y, iconHighDPI->pixmap(size, size));
if (x + dx > maxX)
y+=dy;
x = ((x + dx) % maxX);
}
x = 10;
y+=dy;
// Enable high-dpi icons
QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps, true);
// normal icon
for (int size = minSize; size < maxSize; size += sizeIncrement) {
QPainter p(this);
p.drawPixmap(x, y, iconNormalDpi->pixmap(size, size));
if (x + dx > maxX)
y+=dy;
x = ((x + dx) % maxX);
}
x = 10;
y+=dy;
// high-dpi icon (draw point)
for (int size = minSize; size < maxSize; size += sizeIncrement) {
QPainter p(this);
p.drawPixmap(x, y, iconHighDPI->pixmap(size, size));
if (x + dx > maxX)
y+=dy;
x = ((x + dx) % maxX);
}
x = 10;
y+=dy;
}
private:
QTemporaryDir m_temporaryDir;
QScopedPointer<QIcon> iconHighDPI;
QScopedPointer<QIcon> iconNormalDpi;
};
// Icons on buttons
class Buttons : public QWidget
{
public:
Buttons()
{
QIcon icon;
icon.addFile(":/qticon16@2x.png");
QPushButton *button = new QPushButton(this);
button->setIcon(icon);
button->setText("16@2x");
QTabBar *tab = new QTabBar(this);
tab->addTab(QIcon(":/qticon16.png"), "16@1x");
tab->addTab(QIcon(":/qticon16@2x.png"), "16@2x");
tab->addTab(QIcon(":/qticon16.png"), "");
tab->addTab(QIcon(":/qticon16@2x.png"), "");
tab->move(10, 100);
tab->show();
QToolBar *toolBar = new QToolBar(this);
toolBar->addAction(QIcon(":/qticon16.png"), "16");
toolBar->addAction(QIcon(":/qticon16@2x.png"), "16@2x");
toolBar->addAction(QIcon(":/qticon32.png"), "32");
toolBar->addAction(QIcon(":/qticon32@2x.png"), "32@2x");
toolBar->move(10, 200);
toolBar->show();
}
};
class LinePainter : public QWidget
{
public:
void paintEvent(QPaintEvent *event);
void mousePressEvent(QMouseEvent *event);
void mouseReleaseEvent(QMouseEvent *event);
void mouseMoveEvent(QMouseEvent *event);
QPoint lastMousePoint;
QVector<QPoint> linePoints;
};
void LinePainter::paintEvent(QPaintEvent *)
{
QPainter p(this);
p.fillRect(QRect(QPoint(0, 0), size()), QBrush(Qt::gray));
// Default antialiased line
p.setRenderHint(QPainter::Antialiasing);
p.drawLines(linePoints);
// Cosmetic 1 antialiased line
QPen pen;
pen.setCosmetic(true);
pen.setWidth(1);
p.setPen(pen);
p.translate(3, 3);
p.drawLines(linePoints);
// Aliased cosmetic 1 line
p.setRenderHint(QPainter::Antialiasing, false);
p.translate(3, 3);
p.drawLines(linePoints);
}
void LinePainter::mousePressEvent(QMouseEvent *event)
{
lastMousePoint = event->pos();
}
void LinePainter::mouseReleaseEvent(QMouseEvent *)
{
lastMousePoint = QPoint();
}
void LinePainter::mouseMoveEvent(QMouseEvent *event)
{
if (lastMousePoint.isNull())
return;
QPoint newMousePoint = event->pos();
if (lastMousePoint == newMousePoint)
return;
linePoints.append(lastMousePoint);
linePoints.append(newMousePoint);
lastMousePoint = newMousePoint;
update();
}
class CursorTester : public QWidget
{
public:
CursorTester()
:moveLabel(nullptr), moving(false)
{
}
inline QRect getRect(int idx) const
{
int h = height() / 2;
return QRect(10, 10 + h * (idx - 1), width() - 20, h - 20);
}
void paintEvent(QPaintEvent *)
{
QPainter p(this);
QRect r1 = getRect(1);
QRect r2 = getRect(2);
p.fillRect(r1, QColor(200, 200, 250));
p.drawText(r1, "Drag from here to move a window based on QCursor::pos()");
p.fillRect(r2, QColor(250, 200, 200));
p.drawText(r2, "Drag from here to move a window based on mouse event position");
if (moving) {
p.setPen(Qt::darkGray);
QFont f = font();
f.setPointSize(8);
p.setFont(f);
p.drawEllipse(mousePos, 30,60);
QPoint pt = mousePos - QPoint(0, 60);
QPoint pt2 = pt - QPoint(30,10);
QPoint offs(30, 0);
p.drawLine(pt, pt2);
p.drawLine(pt2 - offs, pt2 + offs);
p.drawText(pt2 - offs, "mouse pos");
p.setPen(QColor(50,130,70));
QPoint cursorPos = mapFromGlobal(QCursor::pos());
pt = cursorPos - QPoint(0, 30);
pt2 = pt + QPoint(60, -20);
p.drawEllipse(cursorPos, 60, 30);
p.drawLine(pt, pt2);
p.drawLine(pt2 - offs, pt2 + offs);
p.drawText(pt2 - offs, "cursor pos");
}
}
void mousePressEvent(QMouseEvent *e)
{
if (moving)
return;
QRect r1 = getRect(1);
QRect r2 = getRect(2);
moving = r1.contains(e->pos()) || r2.contains(e->pos());
if (!moving)
return;
useCursorPos = r1.contains(e->pos());
if (!moveLabel)
moveLabel = new QLabel(this,Qt::BypassWindowManagerHint|Qt::FramelessWindowHint|Qt::Window );
if (useCursorPos)
moveLabel->setText("I'm following QCursor::pos()");
else
moveLabel->setText("I'm following QMouseEvent::globalPos()");
moveLabel->adjustSize();
mouseMoveEvent(e);
moveLabel->show();
}
void mouseReleaseEvent(QMouseEvent *)
{
if (moveLabel)
moveLabel->hide();
update();
moving = false;
}
void mouseMoveEvent(QMouseEvent *e)
{
if (!moving)
return;
QPoint pos = useCursorPos ? QCursor::pos() : e->globalPos();
pos -= moveLabel->rect().center();
moveLabel->move(pos);
mousePos = e->pos();
update();
}
private:
QLabel *moveLabel;
bool useCursorPos;
bool moving;
QPoint mousePos;
};
class ScreenDisplayer : public QWidget
{
public:
ScreenDisplayer()
: QWidget(), moveLabel(nullptr), scaleFactor(1.0)
{
}
void timerEvent(QTimerEvent *) {
update();
}
void mousePressEvent(QMouseEvent *) {
if (!moveLabel)
moveLabel = new QLabel(this,Qt::BypassWindowManagerHint|Qt::FramelessWindowHint|Qt::Window );
moveLabel->setText("Hello, Qt this is a label\nwith some text");
moveLabel->show();
}
void mouseMoveEvent(QMouseEvent *e) {
if (!moveLabel)
return;
moveLabel->move(e->pos() / scaleFactor);
QString str;
QDebug dbg(&str);
dbg.setAutoInsertSpaces(false);
dbg << moveLabel->geometry();
moveLabel->setText(str);
}
void mouseReleaseEvent(QMouseEvent *) {
if (moveLabel)
moveLabel->hide();
}
void showEvent(QShowEvent *) {
refreshTimer.start(300, this);
}
void hideEvent(QHideEvent *) {
refreshTimer.stop();
}
void paintEvent(QPaintEvent *) {
QPainter p(this);
QRectF total;
QList<QScreen*> screens = qApp->screens();
foreach (QScreen *screen, screens) {
total |= screen->geometry();
}
if (total.isEmpty())
return;
scaleFactor = qMin(width()/total.width(), height()/total.height());
p.fillRect(rect(), Qt::black);
p.scale(scaleFactor, scaleFactor);
p.translate(-total.topLeft());
p.setPen(QPen(Qt::white, 10));
p.setBrush(Qt::gray);
foreach (QScreen *screen, screens) {
p.drawRect(screen->geometry());
QFont f = font();
f.setPixelSize(screen->geometry().height() / 8);
p.setFont(f);
p.drawText(screen->geometry(), Qt::AlignCenter, screen->name());
}
p.setBrush(QColor(200,220,255,127));
foreach (QWidget *widget, QApplication::topLevelWidgets()) {
if (!widget->isHidden())
p.drawRect(widget->geometry());
}
QPolygon cursorShape;
cursorShape << QPoint(0,0) << QPoint(20, 60)
<< QPoint(30, 50) << QPoint(60, 80)
<< QPoint(80, 60) << QPoint(50, 30)
<< QPoint(60, 20);
cursorShape.translate(QCursor::pos());
p.drawPolygon(cursorShape);
}
private:
QLabel *moveLabel;
QBasicTimer refreshTimer;
qreal scaleFactor;
};
class PhysicalSizeTest : public QWidget
{
Q_OBJECT
public:
PhysicalSizeTest() : QWidget(), m_ignoreResize(false) {}
void paintEvent(QPaintEvent *event);
void resizeEvent(QResizeEvent *) {
qreal ppi = window()->windowHandle()->screen()->physicalDotsPerInchX();
QSizeF s = size();
if (!m_ignoreResize)
m_physicalSize = s / ppi;
}
bool event(QEvent *event) {
if (event->type() == QEvent::ScreenChangeInternal) {
// we will get resize events when the scale factor changes
m_ignoreResize = true;
QTimer::singleShot(100, this, SLOT(handleScreenChange()));
}
return QWidget::event(event);
}
public slots:
void handleScreenChange() {
qreal ppi = window()->windowHandle()->screen()->physicalDotsPerInchX();
QSizeF newSize = m_physicalSize * ppi;
resize(newSize.toSize());
m_ignoreResize = false;
}
private:
QSizeF m_physicalSize;
bool m_ignoreResize;
};
void PhysicalSizeTest::paintEvent(QPaintEvent *)
{
QPainter p(this);
p.setRenderHint(QPainter::Antialiasing);
qreal ppi = window()->windowHandle()->screen()->physicalDotsPerInchX();
qreal ppmm = ppi / 25.4;
qreal h = 15 * ppmm;
QRectF rulerRect(0,0, width(), h);
rulerRect.moveCenter(rect().center());
QFont f = font();
f.setPixelSize(18);
p.setFont(f);
// draw a rectangle in (Qt) pixel coordinates, for comparison
QRect pixelRect(0, 0, 300, 50);
pixelRect.moveTopLeft(QPoint(5 * ppmm, rulerRect.bottom() + 5 * ppmm));
p.fillRect(pixelRect, QColor(199,222,255));
p.drawText(pixelRect, "This rectangle is 300x50 pixels");
f.setPixelSize(4 * ppmm);
p.setFont(f);
QRectF topRect(0, 0, width(), rulerRect.top());
p.drawText(topRect, Qt::AlignCenter, "The ruler is drawn in physical units.\nThis window tries to keep its physical size\nwhen moved between screens.");
// draw a ruler in real physical coordinates
p.fillRect(rulerRect, QColor(255, 222, 111));
QPen linePen(Qt::black, 0.3 * ppmm);
p.setPen(linePen);
f.setBold(true);
p.setFont(f);
qreal vCenter = rulerRect.center().y();
p.drawLine(0, vCenter, width(), vCenter);
// cm
for (int i = 0;;) {
i++;
qreal x = i * ppmm;
if (x > width())
break;
qreal y = rulerRect.bottom();
qreal len;
if (i % 5)
len = 2 * ppmm;
else if (i % 10)
len = 3 * ppmm;
else
len = h / 2;
p.drawLine(QPointF(x, y), QPointF(x, y - len));
if (i % 10 == 5) {
QRectF textR(0, 0, 5 * ppmm, h / 2 - 2 * ppmm);
textR.moveTopLeft(QPointF(x, vCenter));
int n = i / 10 + 1;
if (n % 10 == 0)
p.setPen(Qt::red);
p.drawText(textR, Qt::AlignCenter, QString::number(n));
p.setPen(linePen);
}
}
//inches
for (int i = 0;;) {
i++;
qreal x = i * ppi / 16;
if (x > width())
break;
qreal y = rulerRect.top();
qreal d = h / 10;
qreal len;
if (i % 2)
len = 1 * d;
else if (i % 4)
len = 2 * d;
else if (i % 8)
len = 3 * d;
else if (i % 16)
len = 4 * d;
else
len = h / 2;
p.drawLine(QPointF(x, y), QPointF(x, y + len));
if (i % 16 == 12) {
QRectF textR(0, 0, 0.25 * ppi, h / 2 - 2 * d);
textR.moveBottomLeft(QPointF(x, vCenter));
p.drawText(textR, Qt::AlignCenter, QString::number(1 + i/16));
}
}
}
class GraphicsViewCaching : public QGraphicsView
{
public:
GraphicsViewCaching() {
QGraphicsScene *scene = new QGraphicsScene(0, 0, 400, 400);
QGraphicsTextItem *item = scene->addText("NoCache");
item->setCacheMode(QGraphicsItem::NoCache);
item->setPos(10, 10);
item = scene->addText("ItemCoordinateCache");
item->setCacheMode(QGraphicsItem::ItemCoordinateCache);
item->setPos(10, 30);
item = scene->addText("DeviceCoordinateCache");
item->setCacheMode(QGraphicsItem::DeviceCoordinateCache);
item->setPos(10, 50);
setScene(scene);
}
};
class MetricsTest : public QWidget
{
QPlainTextEdit *m_textEdit;
public:
MetricsTest()
{
qDebug() << R"(
MetricsTest
Relevant environment variables are:
QT_FONT_DPI=N
QT_SCALE_FACTOR=n
QT_ENABLE_HIGHDPI_SCALING=0|1
QT_USE_PHYSICAL_DPI=0|1
QT_SCREEN_SCALE_FACTORS=N;N;N or QT_SCREEN_SCALE_FACTORS=name:N
QT_SCALE_FACTOR_ROUNDING_POLICY=Round|Ceil|Floor|RoundPreferFloor|PassThrough
QT_DPI_ADJUSTMENT_POLICY=AdjustDpi|DontAdjustDpi|AdjustUpOnly)";
resize(480, 360);
QVBoxLayout *layout = new QVBoxLayout();
setLayout(layout);
m_textEdit = new QPlainTextEdit;
m_textEdit->setReadOnly(true);
layout->addWidget(m_textEdit);
}
void updateMetrics()
{
QString text;
QTextStream str(&text);
auto currentScreen = windowHandle()->screen();
const auto screens = QGuiApplication::screens();
for (int i = 0, size = screens.size(); i < size; ++i) {
auto screen = screens.at(i);
auto platformScreen = screen->handle();
str << "Screen #" << i << " \"" << screen->name() << '"';
if (screen == currentScreen)
str << " [current]";
if (screen == QGuiApplication::primaryScreen())
str << " [primary]";
str << "\n screen geometry: " << screen->geometry()
<< "\n platform screen geometry: " << platformScreen->geometry()
<< "\n platform screen logicalDpi: " << platformScreen->logicalDpi().first;
#ifdef HAVE_SCREEN_BASE_DPI
str << "\n platform screen logicalBaseDpi: " << platformScreen->logicalBaseDpi().first;
#endif
str << "\n platform screen devicePixelRatio: " <<platformScreen->devicePixelRatio()
<< "\n platform screen physicalDpi: " << screen->physicalDotsPerInch()
<< "\n\n";
}
str << "widget devicePixelRatio: " << this->devicePixelRatioF()
<< "\nwidget logicalDpi: " << this->logicalDpiX()
<< "\n\nQT_FONT_DPI: " << qgetenv("QT_FONT_DPI")
<< "\nQT_SCALE_FACTOR: " << qgetenv("QT_SCALE_FACTOR")
<< "\nQT_ENABLE_HIGHDPI_SCALING: " << qgetenv("QT_ENABLE_HIGHDPI_SCALING")
<< "\nQT_SCREEN_SCALE_FACTORS: " << qgetenv("QT_SCREEN_SCALE_FACTORS")
<< "\nQT_USE_PHYSICAL_DPI: " << qgetenv("QT_USE_PHYSICAL_DPI")
<< "\nQT_SCALE_FACTOR_ROUNDING_POLICY: " << qgetenv("QT_SCALE_FACTOR_ROUNDING_POLICY")
<< "\nQT_DPI_ADJUSTMENT_POLICY: " << qgetenv("QT_DPI_ADJUSTMENT_POLICY")
<< '\n';
m_textEdit->setPlainText(text);
}
void paintEvent(QPaintEvent *ev)
{
// We get a paint event on screen change, so this is a convenient place
// to update the metrics, at the possible risk of doing something else
// than painting in a paint event.
updateMetrics();
QWidget::paintEvent(ev);
}
};
int main(int argc, char **argv)
{
QApplication app(argc, argv);
QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
QCoreApplication::setApplicationVersion(QT_VERSION_STR);
int argumentCount = QCoreApplication::arguments().count();
QCommandLineParser parser;
parser.setApplicationDescription("High DPI tester. Pass one or more of the options to\n"
"test various high-dpi aspects. \n"
"--interactive is a special option and opens a configuration"
" window.");
parser.addHelpOption();
parser.addVersionOption();
QCommandLineOption controllerOption("interactive", "Show configuration window.");
parser.addOption(controllerOption);
DemoContainerList demoList;
demoList << new DemoContainer<PixmapPainter>("pixmap", "Test pixmap painter");
demoList << new DemoContainer<TiledPixmapPainter>("tiledpixmap", "Test tiled pixmap painter");
demoList << new DemoContainer<Labels>("label", "Test Labels");
demoList << new DemoContainer<MainWindow>("mainwindow", "Test QMainWindow");
demoList << new DemoContainer<StandardIcons>("standard-icons", "Test standard icons");
demoList << new DemoContainer<Caching>("caching", "Test caching");
demoList << new DemoContainer<Style>("styles", "Test style");
demoList << new DemoContainer<Fonts>("fonts", "Test fonts");
demoList << new DemoContainer<IconDrawing>("icondrawing", "Test icon drawing");
demoList << new DemoContainer<Buttons>("buttons", "Test buttons");
demoList << new DemoContainer<LinePainter>("linepainter", "Test line painting");
demoList << new DemoContainer<DragWidget>("draganddrop", "Test drag and drop");
demoList << new DemoContainer<CursorTester>("cursorpos", "Test cursor and window positioning");
demoList << new DemoContainer<ScreenDisplayer>("screens", "Test screen and window positioning");
demoList << new DemoContainer<PhysicalSizeTest>("physicalsize", "Test manual highdpi support using physicalDotsPerInch");
demoList << new DemoContainer<GraphicsViewCaching>("graphicsview", "Test QGraphicsView caching");
demoList << new DemoContainer<MetricsTest>("metrics", "Show display metrics");
foreach (DemoContainerBase *demo, demoList)
parser.addOption(demo->option());
parser.process(app);
//controller takes ownership of all demos
DemoController controller(&demoList, &parser);
if (parser.isSet(controllerOption) || argumentCount <= 1)
controller.show();
if (QApplication::topLevelWidgets().isEmpty())
parser.showHelp(0);
return app.exec();
}
#include "main.moc"
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