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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include <QtGui>
#include <QtWidgets>
#include <QtGui/qpa/qplatformscreen.h>
#include <QtGui/qpa/qplatformwindow.h>
#include <QtGui/qpa/qplatformcursor.h>
// This test app optionally doubles as a manual test for QScreen::mapToNative()
// #define TEST_MAP_TO_NATIVE
// ScreenDisplayer based on original impl from qtbase/tests/manual/highdpi
class ScreenDisplayer : public QWidget
{
public:
ScreenDisplayer() = default;
void setTitle() {
QPoint deviceIndependentPos = pos();
QPlatformWindow *platformWindow = windowHandle()->handle();
QPoint nativePos = platformWindow->geometry().topLeft();
QString windowDebug = QString("pos ")
+ QString("device independent %1 %2 ").arg(deviceIndependentPos.x()).arg(deviceIndependentPos.y())
+ QString("native %1 %2 ").arg(nativePos.x()).arg(nativePos.y())
;
setWindowTitle(windowDebug);
}
void updateMapToNative(QPointF pos)
{
#ifdef TEST_MAP_TO_NATIVE
mappedToNative = QGuiApplication::mapToNative(QRectF(pos, QPointF(1,1))).topLeft(); // there
mappedFromNative = QGuiApplication::mapFromNative(QRectF(mappedToNative, QPointF(1,1))).topLeft(); // and back again
#endif
}
void timerEvent(QTimerEvent *) override
{
update();
setTitle();
}
void mousePressEvent(QMouseEvent *) override
{
displayMappedToNativeCursor = true;
}
void mouseMoveEvent(QMouseEvent *e) override
{
setTitle();
updateMapToNative(e->globalPosition());
}
void mouseReleaseEvent(QMouseEvent *) override
{
}
void showEvent(QShowEvent *) override
{
refreshTimer.start(60, this);
}
void hideEvent(QHideEvent *) override
{
refreshTimer.stop();
}
void paintScreensInRect(QPainter &p, QRect rect, bool native) {
p.save();
QRectF total;
const auto screens = QGuiApplication::screens();
for (const QScreen *screen : screens)
total |= native ? screen->handle()->geometry() : screen->geometry();
if (total.isEmpty())
return;
qreal scaleMargin = 0.9;
scaleFactor = scaleMargin * qMin(rect.width()/total.width(), rect.height()/total.height());
// p.fillRect(rect, Qt::black);
int margin = 20;
p.translate(margin, margin + rect.y());
p.scale(scaleFactor, scaleFactor);
p.translate(-total.topLeft());
p.setPen(QPen(Qt::white, 10));
p.setBrush(Qt::gray);
for (const QScreen *screen : screens) {
QRect geometry = native ? screen->handle()->geometry() : screen->geometry();
p.drawRect(geometry);
QFont f("Courier New");
f.setPixelSize(geometry.height() / 16);
p.setFont(f);
if (displayInfo) {
QString text = "Name: " + screen->name() + "\n";
text += QString("\nGeometry: %1 %2 %3 %4 \n ").arg(geometry.x()).arg(geometry.y()).arg(geometry.width()).arg(geometry.height());
p.save();
p.translate(20, 0);
p.drawText(geometry, Qt::AlignLeft | Qt::AlignVCenter, text);
p.restore();
}
}
p.setBrush(QColor(200,220,255,127));
const auto topLevels = QApplication::topLevelWidgets();
for (QWidget *widget : topLevels) {
if (!widget->isHidden())
p.drawRect(native ? widget->windowHandle()->handle()->geometry() : 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);
p.save();
p.translate(native ? qApp->primaryScreen()->handle()->cursor()->pos() : QCursor::pos());
p.drawPolygon(cursorShape);
p.restore();
#ifdef TEST_MAP_TO_NATIVE
// Draw red "mapped to native" cursor. We expect this
// cursor to track the normal blue cursor if everything
// works out ok.
if (displayMappedToNativeCursor) {
p.save();
p.setBrush(QColor(230,120,155,127));
p.translate(native ? mappedToNative: mappedFromNative);
p.drawPolygon(cursorShape);
p.restore();
}
#endif
p.restore();
}
void paintEvent(QPaintEvent *) override
{
QPainter p(this);
QRect g = geometry();
int halfHeight = g.height() / 2;
QRect topHalf = QRect(0, 0, g.width(), halfHeight);
QRect bottomHalf = QRect(0, halfHeight, g.width(), halfHeight);
if (displayDeviceIndependentGeometry)
paintScreensInRect(p, topHalf, false);
if (displayNativeGeometry)
paintScreensInRect(p, bottomHalf, true);
}
bool displayInfo = false;
bool displayDeviceIndependentGeometry = true;
bool displayNativeGeometry = false;
private:
bool displayMappedToNativeCursor = false;
QPointF mappedToNative;
QPointF mappedFromNative;
qreal scaleFactor = 1;
QBasicTimer refreshTimer;
};
class Controller : public QWidget {
public:
Controller(ScreenDisplayer *displayer) {
setWindowTitle("Controller");
QVBoxLayout *layout = new QVBoxLayout();
setLayout(layout);
layout->addWidget(new QLabel("Coordinate System:"));
QCheckBox *deviceIndpendentGeometry = new QCheckBox("Device Independent");
deviceIndpendentGeometry->setChecked(true);
connect(deviceIndpendentGeometry, &QCheckBox::stateChanged, [displayer](int checked){ displayer->displayDeviceIndependentGeometry = checked > 0; });
layout->addWidget(deviceIndpendentGeometry);
QCheckBox *nativeGeometry = new QCheckBox("Native");
nativeGeometry->setChecked(false);
connect(nativeGeometry, &QCheckBox::stateChanged, [displayer](int checked){ displayer->displayNativeGeometry = checked > 0; });
layout->addWidget(nativeGeometry);
layout->addSpacing(40);
QCheckBox *debug = new QCheckBox("Debug!");
debug->setChecked(false);
connect(debug, &QCheckBox::stateChanged, [displayer](int checked){ displayer->displayInfo = checked > 0; });
layout->addWidget(debug);
layout->addStretch();
}
};
int main(int argc, char **argv) {
QApplication app(argc, argv);
ScreenDisplayer displayer;
displayer.resize(300, 200);
displayer.show();
Controller controller(&displayer);
controller.resize(100, 200);
QTimer::singleShot(300, [&controller, &displayer](){
controller.move(displayer.pos() + QPoint(displayer.width(), 0) + QPoint(50, 0));
controller.show();
});
return app.exec();
}
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