diff -r 000000000000 -r 1918ee327afb demos/shared/hoverpoints.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/demos/shared/hoverpoints.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,415 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 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(const 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);
+}