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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the demonstration applications of the Qt Toolkit.

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     9 ** $QT_BEGIN_LICENSE:LGPL$

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    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

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    36 **

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    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #ifdef QT_OPENGL_SUPPORT

    43 #include <QGLWidget>

    44 #endif

    45 

    46 #include "arthurwidgets.h"

    47 #include "hoverpoints.h"

    48 

    49 #define printf

    50 

    51 HoverPoints::HoverPoints(QWidget *widget, PointShape shape)

    52     : QObject(widget)

    53 {

    54     m_widget = widget;

    55     widget->installEventFilter(this);

    56     widget->setAttribute(Qt::WA_AcceptTouchEvents);

    57 

    58     m_connectionType = CurveConnection;

    59     m_sortType = NoSort;

    60     m_shape = shape;

    61     m_pointPen = QPen(QColor(255, 255, 255, 191), 1);

    62     m_connectionPen = QPen(QColor(255, 255, 255, 127), 2);

    63     m_pointBrush = QBrush(QColor(191, 191, 191, 127));

    64     m_pointSize = QSize(11, 11);

    65     m_currentIndex = -1;

    66     m_editable = true;

    67     m_enabled = true;

    68 

    69     connect(this, SIGNAL(pointsChanged(const QPolygonF &)),

    70             m_widget, SLOT(update()));

    71 }

    72 

    73 

    74 void HoverPoints::setEnabled(bool enabled)

    75 {

    76     if (m_enabled != enabled) {

    77         m_enabled = enabled;

    78         m_widget->update();

    79     }

    80 }

    81 

    82 

    83 bool HoverPoints::eventFilter(QObject *object, QEvent *event)

    84 {

    85     if (object == m_widget && m_enabled) {

    86         switch (event->type()) {

    87 

    88         case QEvent::MouseButtonPress:

    89         {

    90             if (!m_fingerPointMapping.isEmpty())

    91                 return true;

    92             QMouseEvent *me = (QMouseEvent *) event;

    93 

    94             QPointF clickPos = me->pos();

    95             int index = -1;

    96             for (int i=0; i<m_points.size(); ++i) {

    97                 QPainterPath path;

    98                 if (m_shape == CircleShape)

    99                     path.addEllipse(pointBoundingRect(i));

   100                 else

   101                     path.addRect(pointBoundingRect(i));

   102 

   103                 if (path.contains(clickPos)) {

   104                     index = i;

   105                     break;

   106                 }

   107             }

   108 

   109             if (me->button() == Qt::LeftButton) {

   110                 if (index == -1) {

   111                     if (!m_editable)

   112                         return false;

   113                     int pos = 0;

   114                     // Insert sort for x or y

   115                     if (m_sortType == XSort) {

   116                         for (int i=0; i<m_points.size(); ++i)

   117                             if (m_points.at(i).x() > clickPos.x()) {

   118                                 pos = i;

   119                                 break;

   120                             }

   121                     } else if (m_sortType == YSort) {

   122                         for (int i=0; i<m_points.size(); ++i)

   123                             if (m_points.at(i).y() > clickPos.y()) {

   124                                 pos = i;

   125                                 break;

   126                             }

   127                     }

   128 

   129                     m_points.insert(pos, clickPos);

   130                     m_locks.insert(pos, 0);

   131                     m_currentIndex = pos;

   132                     firePointChange();

   133                 } else {

   134                     m_currentIndex = index;

   135                 }

   136                 return true;

   137 

   138             } else if (me->button() == Qt::RightButton) {

   139                 if (index >= 0 && m_editable) {

   140                     if (m_locks[index] == 0) {

   141                         m_locks.remove(index);

   142                         m_points.remove(index);

   143                     }

   144                     firePointChange();

   145                     return true;

   146                 }

   147             }

   148 

   149         }

   150         break;

   151 

   152         case QEvent::MouseButtonRelease:

   153             if (!m_fingerPointMapping.isEmpty())

   154                 return true;

   155             m_currentIndex = -1;

   156             break;

   157 

   158         case QEvent::MouseMove:

   159             if (!m_fingerPointMapping.isEmpty())

   160                 return true;

   161             if (m_currentIndex >= 0)

   162                 movePoint(m_currentIndex, ((QMouseEvent *)event)->pos());

   163             break;

   164         case QEvent::TouchBegin:

   165         case QEvent::TouchUpdate:

   166             {

   167                 const QTouchEvent *const touchEvent = static_cast<const QTouchEvent*>(event);

   168                 const QList<QTouchEvent::TouchPoint> points = touchEvent->touchPoints();

   169                 const qreal pointSize = qMax(m_pointSize.width(), m_pointSize.height());

   170                 foreach (const QTouchEvent::TouchPoint &touchPoint, points) {

   171                     const int id = touchPoint.id();

   172                     switch (touchPoint.state()) {

   173                     case Qt::TouchPointPressed:

   174                         {

   175                             // find the point, move it

   176                             QSet<int> activePoints = QSet<int>::fromList(m_fingerPointMapping.values());

   177                             int activePoint = -1;

   178                             qreal distance = -1;

   179                             const int pointsCount = m_points.size();

   180                             const int activePointCount = activePoints.size();

   181                             if (pointsCount == 2 && activePointCount == 1) { // only two points

   182                                 activePoint = activePoints.contains(0) ? 1 : 0;

   183                             } else {

   184                                 for (int i=0; i<pointsCount; ++i) {

   185                                     if (activePoints.contains(i))

   186                                         continue;

   187 

   188                                     qreal d = QLineF(touchPoint.pos(), m_points.at(i)).length();

   189                                     if ((distance < 0 && d < 12 * pointSize) || d < distance) {

   190                                         distance = d;

   191                                         activePoint = i;

   192                                     }

   193 

   194                                 }

   195                             }

   196                             if (activePoint != -1) {

   197                                 m_fingerPointMapping.insert(touchPoint.id(), activePoint);

   198                                 movePoint(activePoint, touchPoint.pos());

   199                             }

   200                         }

   201                         break;

   202                     case Qt::TouchPointReleased:

   203                         {

   204                             // move the point and release

   205                             QHash<int,int>::iterator it = m_fingerPointMapping.find(id);

   206                             movePoint(it.value(), touchPoint.pos());

   207                             m_fingerPointMapping.erase(it);

   208                         }

   209                         break;

   210                     case Qt::TouchPointMoved:

   211                         {

   212                             // move the point

   213                             const int pointIdx = m_fingerPointMapping.value(id, -1);

   214                             if (pointIdx >= 0) // do we track this point?

   215                                 movePoint(pointIdx, touchPoint.pos());

   216                         }

   217                         break;

   218                     default:

   219                         break;

   220                     }

   221                 }

   222                 if (m_fingerPointMapping.isEmpty()) {

   223                     event->ignore();

   224                     return false;

   225                 } else {

   226                     return true;

   227                 }

   228             }

   229             break;

   230         case QEvent::TouchEnd:

   231             if (m_fingerPointMapping.isEmpty()) {

   232                 event->ignore();

   233                 return false;

   234             }

   235             return true;

   236             break;

   237 

   238         case QEvent::Resize:

   239         {

   240             QResizeEvent *e = (QResizeEvent *) event;

   241             if (e->oldSize().width() == 0 || e->oldSize().height() == 0)

   242                 break;

   243             qreal stretch_x = e->size().width() / qreal(e->oldSize().width());

   244             qreal stretch_y = e->size().height() / qreal(e->oldSize().height());

   245             for (int i=0; i<m_points.size(); ++i) {

   246                 QPointF p = m_points[i];

   247                 movePoint(i, QPointF(p.x() * stretch_x, p.y() * stretch_y), false);

   248             }

   249 

   250             firePointChange();

   251             break;

   252         }

   253 

   254         case QEvent::Paint:

   255         {

   256             QWidget *that_widget = m_widget;

   257             m_widget = 0;

   258             QApplication::sendEvent(object, event);

   259             m_widget = that_widget;

   260             paintPoints();

   261 #ifdef QT_OPENGL_SUPPORT

   262             ArthurFrame *af = qobject_cast<ArthurFrame *>(that_widget);

   263             if (af && af->usesOpenGL())

   264                 af->glWidget()->swapBuffers();

   265 #endif

   266             return true;

   267         }

   268         default:

   269             break;

   270         }

   271     }

   272 

   273     return false;

   274 }

   275 

   276 

   277 void HoverPoints::paintPoints()

   278 {

   279     QPainter p;

   280 #ifdef QT_OPENGL_SUPPORT

   281     ArthurFrame *af = qobject_cast<ArthurFrame *>(m_widget);

   282     if (af && af->usesOpenGL())

   283         p.begin(af->glWidget());

   284     else

   285         p.begin(m_widget);

   286 #else

   287     p.begin(m_widget);

   288 #endif

   289 

   290     p.setRenderHint(QPainter::Antialiasing);

   291 

   292     if (m_connectionPen.style() != Qt::NoPen && m_connectionType != NoConnection) {

   293         p.setPen(m_connectionPen);

   294 

   295         if (m_connectionType == CurveConnection) {

   296             QPainterPath path;

   297             path.moveTo(m_points.at(0));

   298             for (int i=1; i<m_points.size(); ++i) {

   299                 QPointF p1 = m_points.at(i-1);

   300                 QPointF p2 = m_points.at(i);

   301                 qreal distance = p2.x() - p1.x();

   302 

   303                 path.cubicTo(p1.x() + distance / 2, p1.y(),

   304                              p1.x() + distance / 2, p2.y(),

   305                              p2.x(), p2.y());

   306             }

   307             p.drawPath(path);

   308         } else {

   309             p.drawPolyline(m_points);

   310         }

   311     }

   312 

   313     p.setPen(m_pointPen);

   314     p.setBrush(m_pointBrush);

   315 

   316     for (int i=0; i<m_points.size(); ++i) {

   317         QRectF bounds = pointBoundingRect(i);

   318         if (m_shape == CircleShape)

   319             p.drawEllipse(bounds);

   320         else

   321             p.drawRect(bounds);

   322     }

   323 }

   324 

   325 static QPointF bound_point(const QPointF &point, const QRectF &bounds, int lock)

   326 {

   327     QPointF p = point;

   328 

   329     qreal left = bounds.left();

   330     qreal right = bounds.right();

   331     qreal top = bounds.top();

   332     qreal bottom = bounds.bottom();

   333 

   334     if (p.x() < left || (lock & HoverPoints::LockToLeft)) p.setX(left);

   335     else if (p.x() > right || (lock & HoverPoints::LockToRight)) p.setX(right);

   336 

   337     if (p.y() < top || (lock & HoverPoints::LockToTop)) p.setY(top);

   338     else if (p.y() > bottom || (lock & HoverPoints::LockToBottom)) p.setY(bottom);

   339 

   340     return p;

   341 }

   342 

   343 void HoverPoints::setPoints(const QPolygonF &points)

   344 {

   345     if (points.size() != m_points.size())

   346         m_fingerPointMapping.clear();

   347     m_points.clear();

   348     for (int i=0; i<points.size(); ++i)

   349         m_points << bound_point(points.at(i), boundingRect(), 0);

   350 

   351     m_locks.clear();

   352     if (m_points.size() > 0) {

   353         m_locks.resize(m_points.size());

   354 

   355         m_locks.fill(0);

   356     }

   357 }

   358 

   359 

   360 void HoverPoints::movePoint(int index, const QPointF &point, bool emitUpdate)

   361 {

   362     m_points[index] = bound_point(point, boundingRect(), m_locks.at(index));

   363     if (emitUpdate)

   364         firePointChange();

   365 }

   366 

   367 

   368 inline static bool x_less_than(const QPointF &p1, const QPointF &p2)

   369 {

   370     return p1.x() < p2.x();

   371 }

   372 

   373 

   374 inline static bool y_less_than(const QPointF &p1, const QPointF &p2)

   375 {

   376     return p1.y() < p2.y();

   377 }

   378 

   379 void HoverPoints::firePointChange()

   380 {

   381 //    printf("HoverPoints::firePointChange(), current=%d\n", m_currentIndex);

   382 

   383     if (m_sortType != NoSort) {

   384 

   385         QPointF oldCurrent;

   386         if (m_currentIndex != -1) {

   387             oldCurrent = m_points[m_currentIndex];

   388         }

   389 

   390         if (m_sortType == XSort)

   391             qSort(m_points.begin(), m_points.end(), x_less_than);

   392         else if (m_sortType == YSort)

   393             qSort(m_points.begin(), m_points.end(), y_less_than);

   394 

   395         // Compensate for changed order...

   396         if (m_currentIndex != -1) {

   397             for (int i=0; i<m_points.size(); ++i) {

   398                 if (m_points[i] == oldCurrent) {

   399                     m_currentIndex = i;

   400                     break;

   401                 }

   402             }

   403         }

   404 

   405 //         printf(" - firePointChange(), current=%d\n", m_currentIndex);

   406 

   407     }

   408 

   409 //     for (int i=0; i<m_points.size(); ++i) {

   410 //         printf(" - point(%2d)=[%.2f, %.2f], lock=%d\n",

   411 //                i, m_points.at(i).x(), m_points.at(i).y(), m_locks.at(i));

   412 //     }

   413 

   414     emit pointsChanged(m_points);

   415 }