/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifdef QT_OPENGL_SUPPORT
#include <QGLWidget>
#endif
#include "arthurwidgets.h"
#include "hoverpoints.h"
#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, SIGNAL(pointsChanged(QPolygonF)),
m_widget, SLOT(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());
foreach (const QTouchEvent::TouchPoint &touchPoint, points) {
const int id = touchPoint.id();
switch (touchPoint.state()) {
case Qt::TouchPointPressed:
{
// find the point, move it
QSet<int> activePoints = QSet<int>::fromList(m_fingerPointMapping.values());
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 = 0;
QApplication::sendEvent(object, event);
m_widget = that_widget;
paintPoints();
#ifdef QT_OPENGL_SUPPORT
ArthurFrame *af = qobject_cast<ArthurFrame *>(that_widget);
if (af && af->usesOpenGL())
af->glWidget()->swapBuffers();
#endif
return true;
}
default:
break;
}
}
return false;
}
void HoverPoints::paintPoints()
{
QPainter p;
#ifdef QT_OPENGL_SUPPORT
ArthurFrame *af = qobject_cast<ArthurFrame *>(m_widget);
if (af && af->usesOpenGL())
p.begin(af->glWidget());
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)
qSort(m_points.begin(), m_points.end(), x_less_than);
else if (m_sortType == YSort)
qSort(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);
}