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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include "hoverpoints.h"
++
++ #include <algorithm>
++
++ HoverPoints::HoverPoints(QWidget *widget, PointShape shape)
++ : QObject(widget),
++ m_widget(widget),
++ m_shape(shape)
++ {
++ widget->installEventFilter(this);
++ widget->setAttribute(Qt::WA_AcceptTouchEvents);
++
++ connect(this, &HoverPoints::pointsChanged,
++ m_widget, QOverload<>::of(&QWidget::update));
++ }
++
++ void HoverPoints::setEnabled(bool enabled)
++ {
++ if (m_enabled != enabled) {
++ m_enabled = enabled;
++ m_widget->update();
++ }
++ }
++
++ bool HoverPoints::eventFilter(QObject *object, QEvent *event)
++ {
++ if (object != m_widget || !m_enabled)
++ return false;
++
++ switch (event->type()) {
++ case QEvent::MouseButtonPress:
++ {
++ if (!m_fingerPointMapping.isEmpty())
++ return true;
++ auto *me = static_cast<const QMouseEvent *>(event);
++ QPointF clickPos = me->position().toPoint();
++ qsizetype index = -1;
++ for (qsizetype i = 0; i < m_points.size(); ++i) {
++ QPainterPath path;
++ const QRectF rect = pointBoundingRect(m_points.at(i));
++ if (m_shape == CircleShape)
++ path.addEllipse(rect);
++ else
++ path.addRect(rect);
++
++ if (path.contains(clickPos)) {
++ index = i;
++ break;
++ }
++ }
++
++ if (me->button() == Qt::LeftButton) {
++ if (index == -1) {
++ if (!m_editable)
++ return false;
++ qsizetype pos = 0;
++ // Insert sort for x or y
++ switch (m_sortType) {
++ case XSort:
++ for (qsizetype i = 0; i < m_points.size(); ++i) {
++ if (m_points.at(i).x() > clickPos.x()) {
++ pos = i;
++ break;
++ }
++ }
++ break;
++ case YSort:
++ for (qsizetype i = 0; i < m_points.size(); ++i) {
++ if (m_points.at(i).y() > clickPos.y()) {
++ pos = i;
++ break;
++ }
++ }
++ break;
++ default:
++ break;
++ }
++
++ m_points.insert(pos, clickPos);
++ m_locks.insert(pos, 0);
++ m_currentIndex = pos;
++ firePointChange();
++ } else {
++ m_currentIndex = index;
++ }
++ return true;
++
++ } else if (me->button() == Qt::RightButton) {
++ if (index >= 0 && m_editable) {
++ if (m_locks[index] == 0) {
++ m_locks.remove(index);
++ m_points.remove(index);
++ }
++ firePointChange();
++ return true;
++ }
++ }
++ }
++ break;
++
++ case QEvent::MouseButtonRelease:
++ if (!m_fingerPointMapping.isEmpty())
++ return true;
++ m_currentIndex = -1;
++ break;
++
++ case QEvent::MouseMove:
++ if (!m_fingerPointMapping.isEmpty())
++ return true;
++ if (m_currentIndex >= 0) {
++ auto *me = static_cast<const QMouseEvent *>(event);
++ movePoint(m_currentIndex, me->position().toPoint());
++ }
++ break;
++
++ case QEvent::TouchBegin:
++ case QEvent::TouchUpdate:
++ {
++ auto *touchEvent = static_cast<const QTouchEvent*>(event);
++ const auto points = touchEvent->points();
++ const qreal pointSize = qMax(m_pointSize.width(), m_pointSize.height());
++ for (const auto &point : points) {
++ const int id = point.id();
++ switch (point.state()) {
++ case QEventPoint::Pressed:
++ case QEventPoint::Stationary:
++ {
++ // find the point, move it
++ const auto mappedPoints = m_fingerPointMapping.values();
++ QSet<qsizetype> activePoints(mappedPoints.begin(), mappedPoints.end());
++ qsizetype activePoint = -1;
++ qreal distance = -1;
++ const qsizetype pointsCount = m_points.size();
++ const qsizetype activePointCount = activePoints.size();
++ if (pointsCount == 2 && activePointCount == 1) { // only two points
++ activePoint = activePoints.contains(0) ? 1 : 0;
++ } else {
++ for (qsizetype i = 0; i < pointsCount; ++i) {
++ if (activePoints.contains(i))
++ continue;
++
++ qreal d = QLineF(point.position(), m_points.at(i)).length();
++ if ((distance < 0 && d < 12 * pointSize) || d < distance) {
++ distance = d;
++ activePoint = i;
++ }
++
++ }
++ }
++ if (activePoint != -1) {
++ m_fingerPointMapping.insert(id, activePoint);
++ movePoint(activePoint, point.position());
++ }
++ }
++ break;
++ case QEventPoint::Released:
++ {
++ // move the point and release
++ const auto it = m_fingerPointMapping.constFind(id);
++ if (it != m_fingerPointMapping.constEnd()) {
++ movePoint(it.value(), point.position());
++ m_fingerPointMapping.erase(it);
++ }
++ }
++ break;
++ case QEventPoint::Updated:
++ {
++ // move the point
++ const qsizetype pointIdx = m_fingerPointMapping.value(id, -1);
++ if (pointIdx >= 0) // do we track this point?
++ movePoint(pointIdx, point.position());
++ }
++ break;
++ default:
++ break;
++ }
++ }
++ if (m_fingerPointMapping.isEmpty()) {
++ event->ignore();
++ return false;
++ }
++ return true;
++ }
++ case QEvent::TouchEnd:
++ if (m_fingerPointMapping.isEmpty()) {
++ event->ignore();
++ return false;
++ }
++ return true;
++
++ case QEvent::Resize:
++ {
++ auto *e = static_cast<const QResizeEvent *>(event);
++ if (e->oldSize().width() <= 0 || e->oldSize().height() <= 0)
++ break;
++ qreal stretch_x = e->size().width() / qreal(e->oldSize().width());
++ qreal stretch_y = e->size().height() / qreal(e->oldSize().height());
++ for (qsizetype i = 0; i < m_points.size(); ++i) {
++ QPointF p = m_points.at(i);
++ movePoint(i, QPointF(p.x() * stretch_x, p.y() * stretch_y), false);
++ }
++
++ firePointChange();
++ break;
++ }
++
++ case QEvent::Paint:
++ {
++ QWidget *that_widget = m_widget;
++ m_widget = nullptr;
++ QCoreApplication::sendEvent(object, event);
++ m_widget = that_widget;
++ paintPoints();
++ return true;
++ }
++
++ default:
++ break;
++ }
++
++ return false;
++ }
++
++
++ void HoverPoints::paintPoints()
++ {
++ QPainter p;
++ p.begin(m_widget);
++
++ p.setRenderHint(QPainter::Antialiasing);
++
++ if (m_connectionPen.style() != Qt::NoPen && m_connectionType != NoConnection) {
++ p.setPen(m_connectionPen);
++
++ if (m_connectionType == CurveConnection) {
++ QPainterPath path;
++ path.moveTo(m_points.at(0));
++ for (qsizetype i = 1; i < m_points.size(); ++i) {
++ QPointF p1 = m_points.at(i - 1);
++ QPointF p2 = m_points.at(i);
++ qreal distance = p2.x() - p1.x();
++
++ path.cubicTo(p1.x() + distance / 2, p1.y(),
++ p1.x() + distance / 2, p2.y(),
++ p2.x(), p2.y());
++ }
++ p.drawPath(path);
++ } else {
++ p.drawPolyline(m_points);
++ }
++ }
++
++ p.setPen(m_pointPen);
++ p.setBrush(m_pointBrush);
++
++ for (const auto &point : std::as_const(m_points)) {
++ QRectF bounds = pointBoundingRect(point);
++ if (m_shape == CircleShape)
++ p.drawEllipse(bounds);
++ else
++ p.drawRect(bounds);
++ }
++ }
++
++ static QPointF bound_point(const QPointF &point, const QRectF &bounds, int lock)
++ {
++ QPointF p = point;
++
++ qreal left = bounds.left();
++ qreal right = bounds.right();
++ qreal top = bounds.top();
++ qreal bottom = bounds.bottom();
++
++ if (p.x() < left || (lock & HoverPoints::LockToLeft)) p.setX(left);
++ else if (p.x() > right || (lock & HoverPoints::LockToRight)) p.setX(right);
++
++ if (p.y() < top || (lock & HoverPoints::LockToTop)) p.setY(top);
++ else if (p.y() > bottom || (lock & HoverPoints::LockToBottom)) p.setY(bottom);
++
++ return p;
++ }
++
++ void HoverPoints::setPoints(const QPolygonF &points)
++ {
++ if (points.size() != m_points.size())
++ m_fingerPointMapping.clear();
++ m_points.clear();
++ for (qsizetype i = 0; i < points.size(); ++i)
++ m_points << bound_point(points.at(i), boundingRect(), 0);
++
++ m_locks.clear();
++ if (m_points.size() > 0) {
++ m_locks.resize(m_points.size());
++ m_locks.fill(0);
++ }
++ }
++
++ void HoverPoints::movePoint(qsizetype index, const QPointF &point, bool emitUpdate)
++ {
++ m_points[index] = bound_point(point, boundingRect(), m_locks.at(index));
++ if (emitUpdate)
++ firePointChange();
++ }
++
++ inline static bool x_less_than(const QPointF &p1, const QPointF &p2)
++ {
++ return p1.x() < p2.x();
++ }
++
++ inline static bool y_less_than(const QPointF &p1, const QPointF &p2)
++ {
++ return p1.y() < p2.y();
++ }
++
++ void HoverPoints::firePointChange()
++ {
++ if (m_sortType != NoSort) {
++
++ QPointF oldCurrent;
++ if (m_currentIndex != -1)
++ oldCurrent = m_points[m_currentIndex];
++
++ if (m_sortType == XSort)
++ std::sort(m_points.begin(), m_points.end(), x_less_than);
++ else if (m_sortType == YSort)
++ std::sort(m_points.begin(), m_points.end(), y_less_than);
++
++ // Compensate for changed order...
++ if (m_currentIndex != -1) {
++ for (qsizetype i = 0; i < m_points.size(); ++i) {
++ if (m_points[i] == oldCurrent) {
++ m_currentIndex = i;
++ break;
++ }
++ }
++ }
++ }
++
++ emit pointsChanged(m_points);
++ }