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Manual tablet test: Draw crosshairs when tablet pen is close

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Crosshairs provide better visual feedback for coordinate
conversions.

Change-Id: I20f67733d7a5e6b1455507a39a8b9535202a92c4
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
This commit is contained in:
Friedemann Kleint 2018-03-12 17:09:18 +01:00
parent b30b957552
commit ed245f3e70
1 changed files with 44 additions and 16 deletions
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60
tests/manual/qtabletevent/regular_widgets/main.cpp
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@ -61,23 +61,38 @@ struct TabletPoint
class ProximityEventFilter : public QObject
{
Q_OBJECT
public:
explicit ProximityEventFilter(QObject *parent) : QObject(parent) { }
bool eventFilter(QObject *, QEvent *event) override
{
switch (event->type()) {
case QEvent::TabletEnterProximity:
case QEvent::TabletLeaveProximity:
qDebug() << event;
break;
default:
break;
}
return false;
}
bool eventFilter(QObject *, QEvent *event) override;
static bool tabletPenProximity() { return m_tabletPenProximity; }
signals:
void proximityChanged();
private:
static bool m_tabletPenProximity;
};
bool ProximityEventFilter::eventFilter(QObject *, QEvent *event)
{
switch (event->type()) {
case QEvent::TabletEnterProximity:
case QEvent::TabletLeaveProximity:
ProximityEventFilter::m_tabletPenProximity = event->type() == QEvent::TabletEnterProximity;
emit proximityChanged();
qDebug() << event;
break;
default:
break;
}
return false;
}
bool ProximityEventFilter::m_tabletPenProximity = false;
class EventReportWidget : public QWidget
{
Q_OBJECT
@ -111,6 +126,7 @@ private:
Qt::MouseButton m_lastButton = Qt::NoButton;
QVector<TabletPoint> m_points;
QVector<QPointF> m_touchPoints;
QPointF m_tabletPos;
int m_tabletMoveCount = 0;
int m_paintEventCount = 0;
};
@ -169,6 +185,13 @@ void EventReportWidget::paintEvent(QPaintEvent *)
}
}
}
// Draw haircross when tablet pen is in proximity
if (ProximityEventFilter::tabletPenProximity() && geom.contains(m_tabletPos)) {
p.setPen(Qt::black);
p.drawLine(QPointF(0, m_tabletPos.y()), QPointF(geom.width(), m_tabletPos.y()));
p.drawLine(QPointF(m_tabletPos.x(), 0), QPointF(m_tabletPos.x(), geom.height()));
}
p.setPen(Qt::blue);
for (QPointF t : m_touchPoints) {
p.drawLine(t.x() - 40, t.y(), t.x() + 40, t.y());
@ -181,20 +204,21 @@ void EventReportWidget::tabletEvent(QTabletEvent *event)
{
QWidget::tabletEvent(event);
bool isMove = false;
m_tabletPos = event->posF();
switch (event->type()) {
case QEvent::TabletMove:
m_points.push_back(TabletPoint(event->pos(), TabletMove, m_lastButton, event->pointerType(), event->pressure(), event->rotation()));
m_points.push_back(TabletPoint(m_tabletPos, TabletMove, m_lastButton, event->pointerType(), event->pressure(), event->rotation()));
update();
isMove = true;
++m_tabletMoveCount;
break;
case QEvent::TabletPress:
m_points.push_back(TabletPoint(event->pos(), TabletButtonPress, event->button(), event->pointerType(), event->rotation()));
m_points.push_back(TabletPoint(m_tabletPos, TabletButtonPress, event->button(), event->pointerType(), event->rotation()));
m_lastButton = event->button();
update();
break;
case QEvent::TabletRelease:
m_points.push_back(TabletPoint(event->pos(), TabletButtonRelease, event->button(), event->pointerType(), event->rotation()));
m_points.push_back(TabletPoint(m_tabletPos, TabletButtonRelease, event->button(), event->pointerType(), event->rotation()));
update();
break;
default:
@ -253,10 +277,14 @@ void EventReportWidget::timerEvent(QTimerEvent *)
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
app.installEventFilter(new ProximityEventFilter(&app));
ProximityEventFilter *proximityEventFilter = new ProximityEventFilter(&app);
app.installEventFilter(proximityEventFilter);
QMainWindow mainWindow;
mainWindow.setWindowTitle(QString::fromLatin1("Tablet Test %1").arg(QT_VERSION_STR));
EventReportWidget *widget = new EventReportWidget;
QObject::connect(proximityEventFilter, &ProximityEventFilter::proximityChanged,
widget, QOverload<void>::of(&QWidget::update));
widget->setMinimumSize(640, 480);
QMenu *fileMenu = mainWindow.menuBar()->addMenu("File");
fileMenu->addAction("Clear", widget, &EventReportWidget::clearPoints);