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HighDPI: Add “metrics” manual test

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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>
This commit is contained in:
Morten Johan Sørvig 2016-04-27 01:15:48 +02:00
parent 900f2cb6f7
commit 3e5362bfa1
1 changed files with 89 additions and 0 deletions
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89
tests/manual/highdpi/main.cpp
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@ -37,10 +37,12 @@
#include <QPushButton>
#include <QButtonGroup>
#include <QLineEdit>
#include <QPlainTextEdit>
#include <QScrollBar>
#include <QSlider>
#include <QSpinBox>
#include <QTabBar>
#include <QTextBrowser>
#include <QIcon>
#include <QPainter>
#include <QWindow>
@ -55,9 +57,16 @@
#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:
@ -1176,6 +1185,85 @@ public:
}
};
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);
@ -1212,6 +1300,7 @@ int main(int argc, char **argv)
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());