Initial import from the monolithic Qt.

This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:

http://qt.gitorious.org/qt/pages/GitIntroductionWithQt

If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.

Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 415 insertions, 0 deletions

diff --git a/demos/shared/hoverpoints.cpp b/demos/shared/hoverpoints.cpp
new file mode 100644
index 0000000000..272f89540c
--- /dev/null
+++ b/demos/shared/hoverpoints.cpp
@@ -0,0 +1,415 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 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);
+}