qt5base-lts/examples/widgets/painting/shared/hoverpoints.cpp
Johan Klokkhammer Helsing 4772a2da15 Move QOpenGLWindow from QtGui to QtOpenGL
Task-number: QTBUG-74409
Change-Id: If7d27cdfa2c6cd5b167887ad77b9cfe413cb106a
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
2020-01-15 15:38:59 +01:00

425 lines
14 KiB
C++

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#include "arthurwidgets.h"
#include "hoverpoints.h"
#include <algorithm>
#if QT_CONFIG(opengl)
#include <QtOpenGL/QOpenGLWindow>
#endif
#define printf
HoverPoints::HoverPoints(QWidget *widget, PointShape shape)
: QObject(widget)
{
m_widget = widget;
widget->installEventFilter(this);
widget->setAttribute(Qt::WA_AcceptTouchEvents);
m_connectionType = CurveConnection;
m_sortType = NoSort;
m_shape = shape;
m_pointPen = QPen(QColor(255, 255, 255, 191), 1);
m_connectionPen = QPen(QColor(255, 255, 255, 127), 2);
m_pointBrush = QBrush(QColor(191, 191, 191, 127));
m_pointSize = QSize(11, 11);
m_currentIndex = -1;
m_editable = true;
m_enabled = true;
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) {
switch (event->type()) {
case QEvent::MouseButtonPress:
{
if (!m_fingerPointMapping.isEmpty())
return true;
QMouseEvent *me = (QMouseEvent *) event;
QPointF clickPos = me->pos();
int index = -1;
for (int i=0; i<m_points.size(); ++i) {
QPainterPath path;
if (m_shape == CircleShape)
path.addEllipse(pointBoundingRect(i));
else
path.addRect(pointBoundingRect(i));
if (path.contains(clickPos)) {
index = i;
break;
}
}
if (me->button() == Qt::LeftButton) {
if (index == -1) {
if (!m_editable)
return false;
int pos = 0;
// Insert sort for x or y
if (m_sortType == XSort) {
for (int i=0; i<m_points.size(); ++i)
if (m_points.at(i).x() > clickPos.x()) {
pos = i;
break;
}
} else if (m_sortType == YSort) {
for (int i=0; i<m_points.size(); ++i)
if (m_points.at(i).y() > clickPos.y()) {
pos = i;
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)
movePoint(m_currentIndex, ((QMouseEvent *)event)->pos());
break;
case QEvent::TouchBegin:
case QEvent::TouchUpdate:
{
const QTouchEvent *const touchEvent = static_cast<const QTouchEvent*>(event);
const QList<QTouchEvent::TouchPoint> points = touchEvent->touchPoints();
const qreal pointSize = qMax(m_pointSize.width(), m_pointSize.height());
for (const QTouchEvent::TouchPoint &touchPoint : points) {
const int id = touchPoint.id();
switch (touchPoint.state()) {
case Qt::TouchPointPressed:
{
// find the point, move it
const auto mappedPoints = m_fingerPointMapping.values();
QSet<int> activePoints = QSet<int>(mappedPoints.begin(), mappedPoints.end());
int activePoint = -1;
qreal distance = -1;
const int pointsCount = m_points.size();
const int activePointCount = activePoints.size();
if (pointsCount == 2 && activePointCount == 1) { // only two points
activePoint = activePoints.contains(0) ? 1 : 0;
} else {
for (int i=0; i<pointsCount; ++i) {
if (activePoints.contains(i))
continue;
qreal d = QLineF(touchPoint.pos(), m_points.at(i)).length();
if ((distance < 0 && d < 12 * pointSize) || d < distance) {
distance = d;
activePoint = i;
}
}
}
if (activePoint != -1) {
m_fingerPointMapping.insert(touchPoint.id(), activePoint);
movePoint(activePoint, touchPoint.pos());
}
}
break;
case Qt::TouchPointReleased:
{
// move the point and release
QHash<int,int>::iterator it = m_fingerPointMapping.find(id);
movePoint(it.value(), touchPoint.pos());
m_fingerPointMapping.erase(it);
}
break;
case Qt::TouchPointMoved:
{
// move the point
const int pointIdx = m_fingerPointMapping.value(id, -1);
if (pointIdx >= 0) // do we track this point?
movePoint(pointIdx, touchPoint.pos());
}
break;
default:
break;
}
}
if (m_fingerPointMapping.isEmpty()) {
event->ignore();
return false;
} else {
return true;
}
}
break;
case QEvent::TouchEnd:
if (m_fingerPointMapping.isEmpty()) {
event->ignore();
return false;
}
return true;
break;
case QEvent::Resize:
{
QResizeEvent *e = (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 (int i=0; i<m_points.size(); ++i) {
QPointF p = m_points[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;
#if QT_CONFIG(opengl)
ArthurFrame *af = qobject_cast<ArthurFrame *>(m_widget);
if (af && af->usesOpenGL() && af->glWindow()->isValid()) {
af->glWindow()->makeCurrent();
p.begin(af->glWindow());
} else {
p.begin(m_widget);
}
#else
p.begin(m_widget);
#endif
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 (int 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 (int i=0; i<m_points.size(); ++i) {
QRectF bounds = pointBoundingRect(i);
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 (int 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(int 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()
{
// printf("HoverPoints::firePointChange(), current=%d\n", m_currentIndex);
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 (int i=0; i<m_points.size(); ++i) {
if (m_points[i] == oldCurrent) {
m_currentIndex = i;
break;
}
}
}
// printf(" - firePointChange(), current=%d\n", m_currentIndex);
}
// for (int i=0; i<m_points.size(); ++i) {
// printf(" - point(%2d)=[%.2f, %.2f], lock=%d\n",
// i, m_points.at(i).x(), m_points.at(i).y(), m_locks.at(i));
// }
emit pointsChanged(m_points);
}