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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "navigation2d.h"
#include <QGestureEvent>
#include <QScrollBar>
#include <QWheelEvent>
#include <QMetaMethod>
#include <cmath>
namespace QmlDesigner {
void Navigation2dFilter::scroll(const QPointF &direction, QScrollBar *sbx, QScrollBar *sby)
{
auto doScroll = [](QScrollBar *sb, float distance) {
if (sb) {
// max - min + pageStep = sceneRect.size * scale
float d1 = sb->maximum() - sb->minimum();
float d2 = d1 + sb->pageStep();
float val = (distance / d2) * d1;
sb->setValue(sb->value() - val);
}
};
doScroll(sbx, direction.x());
doScroll(sby, direction.y());
}
Navigation2dFilter::Navigation2dFilter(QWidget *parent)
: QObject(parent)
{
if (parent)
parent->grabGesture(Qt::PinchGesture);
}
bool Navigation2dFilter::eventFilter(QObject *object, QEvent *event)
{
if (event->type() == QEvent::Gesture)
return gestureEvent(static_cast<QGestureEvent *>(event));
else if (event->type() == QEvent::Wheel)
return wheelEvent(static_cast<QWheelEvent *>(event));
return QObject::eventFilter(object, event);
}
bool Navigation2dFilter::gestureEvent(QGestureEvent *event)
{
if (QPinchGesture *pinch = static_cast<QPinchGesture *>(event->gesture(Qt::PinchGesture))) {
QPinchGesture::ChangeFlags changeFlags = pinch->changeFlags();
if (changeFlags.testFlag(QPinchGesture::ScaleFactorChanged)) {
emit zoomChanged(-(1.0 - pinch->scaleFactor()), pinch->startCenterPoint());
event->accept();
return true;
}
}
return false;
}
bool Navigation2dFilter::wheelEvent(QWheelEvent *event)
{
if (!event->modifiers().testFlag(Qt::ControlModifier)) {
if (event->source() == Qt::MouseEventSynthesizedBySystem) {
emit panChanged(QPointF(event->pixelDelta()));
event->accept();
return true;
}
return false;
}
auto zoomChangedSignal = QMetaMethod::fromSignal(&Navigation2dFilter::zoomChanged);
bool zoomChangedConnected = QObject::isSignalConnected(zoomChangedSignal);
if (zoomChangedConnected) {
if (QPointF delta = event->pixelDelta(); !delta.isNull()) {
double dist = std::abs(delta.x()) > std::abs(delta.y()) ? -delta.x() : delta.y();
emit zoomChanged(dist/200.0, event->position());
event->accept();
return true;
} else if (QPointF delta = event->angleDelta(); !delta.isNull()) {
double dist = std::abs(delta.x()) > std::abs(delta.y()) ? -delta.x() : delta.y();
dist = dist / (8*15);
emit zoomChanged(dist/200.0, event->position());
event->accept();
return true;
}
return false;
}
auto zoomInSignal = QMetaMethod::fromSignal(&Navigation2dFilter::zoomIn);
bool zoomInConnected = QObject::isSignalConnected(zoomInSignal);
auto zoomOutSignal = QMetaMethod::fromSignal(&Navigation2dFilter::zoomOut);
bool zoomOutConnected = QObject::isSignalConnected(zoomOutSignal);
if (zoomInConnected && zoomOutConnected) {
if (QPointF angle = event->angleDelta(); !angle.isNull()) {
double delta = std::abs(angle.x()) > std::abs(angle.y()) ? angle.x() : angle.y();
if (delta > 0)
emit zoomIn();
else
emit zoomOut();
event->accept();
return true;
}
}
return false;
}
} // End namespace QmlDesigner.
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