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pathstroke.cpp Example File
demos/pathstroke/pathstroke.cpp

 /****************************************************************************
 **
 ** 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.
 **
 **
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 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "pathstroke.h"
 #include "arthurstyle.h"
 #include "arthurwidgets.h"

 #include <stdio.h>

 extern void draw_round_rect(QPainter *p, const QRect &bounds, int radius);

 PathStrokeControls::PathStrokeControls(QWidget* parent, PathStrokeRenderer* renderer, bool smallScreen)
       : QWidget(parent)
 {
     m_renderer = renderer;

     if (smallScreen)
         layoutForSmallScreens();
     else
         layoutForDesktop();
 }

 void PathStrokeControls::createCommonControls(QWidget* parent)
 {
     m_capGroup = new QGroupBox(parent);
     m_capGroup->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
     QRadioButton *flatCap = new QRadioButton(m_capGroup);
     QRadioButton *squareCap = new QRadioButton(m_capGroup);
     QRadioButton *roundCap = new QRadioButton(m_capGroup);
     m_capGroup->setTitle(tr("Cap Style"));
     flatCap->setText(tr("Flat"));
     squareCap->setText(tr("Square"));
     roundCap->setText(tr("Round"));
     flatCap->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
     squareCap->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
     roundCap->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

     m_joinGroup = new QGroupBox(parent);
     m_joinGroup->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
     QRadioButton *bevelJoin = new QRadioButton(m_joinGroup);
     QRadioButton *miterJoin = new QRadioButton(m_joinGroup);
     QRadioButton *roundJoin = new QRadioButton(m_joinGroup);
     m_joinGroup->setTitle(tr("Join Style"));
     bevelJoin->setText(tr("Bevel"));
     miterJoin->setText(tr("Miter"));
     roundJoin->setText(tr("Round"));

     m_styleGroup = new QGroupBox(parent);
     m_styleGroup->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
     QRadioButton *solidLine = new QRadioButton(m_styleGroup);
     QRadioButton *dashLine = new QRadioButton(m_styleGroup);
     QRadioButton *dotLine = new QRadioButton(m_styleGroup);
     QRadioButton *dashDotLine = new QRadioButton(m_styleGroup);
     QRadioButton *dashDotDotLine = new QRadioButton(m_styleGroup);
     QRadioButton *customDashLine = new QRadioButton(m_styleGroup);
     m_styleGroup->setTitle(tr("Pen Style"));

     QPixmap line_solid(":res/images/line_solid.png");
     solidLine->setIcon(line_solid);
     solidLine->setIconSize(line_solid.size());
     QPixmap line_dashed(":res/images/line_dashed.png");
     dashLine->setIcon(line_dashed);
     dashLine->setIconSize(line_dashed.size());
     QPixmap line_dotted(":res/images/line_dotted.png");
     dotLine->setIcon(line_dotted);
     dotLine->setIconSize(line_dotted.size());
     QPixmap line_dash_dot(":res/images/line_dash_dot.png");
     dashDotLine->setIcon(line_dash_dot);
     dashDotLine->setIconSize(line_dash_dot.size());
     QPixmap line_dash_dot_dot(":res/images/line_dash_dot_dot.png");
     dashDotDotLine->setIcon(line_dash_dot_dot);
     dashDotDotLine->setIconSize(line_dash_dot_dot.size());
     customDashLine->setText(tr("Custom"));

     int fixedHeight = bevelJoin->sizeHint().height();
     solidLine->setFixedHeight(fixedHeight);
     dashLine->setFixedHeight(fixedHeight);
     dotLine->setFixedHeight(fixedHeight);
     dashDotLine->setFixedHeight(fixedHeight);
     dashDotDotLine->setFixedHeight(fixedHeight);

     m_pathModeGroup = new QGroupBox(parent);
     m_pathModeGroup->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
     QRadioButton *curveMode = new QRadioButton(m_pathModeGroup);
     QRadioButton *lineMode = new QRadioButton(m_pathModeGroup);
     m_pathModeGroup->setTitle(tr("Line Style"));
     curveMode->setText(tr("Curves"));
     lineMode->setText(tr("Lines"));

     // Layouts
     QVBoxLayout *capGroupLayout = new QVBoxLayout(m_capGroup);
     capGroupLayout->addWidget(flatCap);
     capGroupLayout->addWidget(squareCap);
     capGroupLayout->addWidget(roundCap);

     QVBoxLayout *joinGroupLayout = new QVBoxLayout(m_joinGroup);
     joinGroupLayout->addWidget(bevelJoin);
     joinGroupLayout->addWidget(miterJoin);
     joinGroupLayout->addWidget(roundJoin);

     QVBoxLayout *styleGroupLayout = new QVBoxLayout(m_styleGroup);
     styleGroupLayout->addWidget(solidLine);
     styleGroupLayout->addWidget(dashLine);
     styleGroupLayout->addWidget(dotLine);
     styleGroupLayout->addWidget(dashDotLine);
     styleGroupLayout->addWidget(dashDotDotLine);
     styleGroupLayout->addWidget(customDashLine);

     QVBoxLayout *pathModeGroupLayout = new QVBoxLayout(m_pathModeGroup);
     pathModeGroupLayout->addWidget(curveMode);
     pathModeGroupLayout->addWidget(lineMode);

     // Connections
     connect(flatCap, SIGNAL(clicked()), m_renderer, SLOT(setFlatCap()));
     connect(squareCap, SIGNAL(clicked()), m_renderer, SLOT(setSquareCap()));
     connect(roundCap, SIGNAL(clicked()), m_renderer, SLOT(setRoundCap()));

     connect(bevelJoin, SIGNAL(clicked()), m_renderer, SLOT(setBevelJoin()));
     connect(miterJoin, SIGNAL(clicked()), m_renderer, SLOT(setMiterJoin()));
     connect(roundJoin, SIGNAL(clicked()), m_renderer, SLOT(setRoundJoin()));

     connect(curveMode, SIGNAL(clicked()), m_renderer, SLOT(setCurveMode()));
     connect(lineMode, SIGNAL(clicked()), m_renderer, SLOT(setLineMode()));

     connect(solidLine, SIGNAL(clicked()), m_renderer, SLOT(setSolidLine()));
     connect(dashLine, SIGNAL(clicked()), m_renderer, SLOT(setDashLine()));
     connect(dotLine, SIGNAL(clicked()), m_renderer, SLOT(setDotLine()));
     connect(dashDotLine, SIGNAL(clicked()), m_renderer, SLOT(setDashDotLine()));
     connect(dashDotDotLine, SIGNAL(clicked()), m_renderer, SLOT(setDashDotDotLine()));
     connect(customDashLine, SIGNAL(clicked()), m_renderer, SLOT(setCustomDashLine()));

     // Set the defaults:
     flatCap->setChecked(true);
     bevelJoin->setChecked(true);
     curveMode->setChecked(true);
     solidLine->setChecked(true);
 }

 void PathStrokeControls::layoutForDesktop()
 {
     QGroupBox *mainGroup = new QGroupBox(this);
     mainGroup->setFixedWidth(180);
     mainGroup->setTitle(tr("Path Stroking"));

     createCommonControls(mainGroup);

     QGroupBox* penWidthGroup = new QGroupBox(mainGroup);
     QSlider *penWidth = new QSlider(Qt::Horizontal, penWidthGroup);
     penWidth->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
     penWidthGroup->setTitle(tr("Pen Width"));
     penWidth->setRange(0, 500);

     QPushButton *animated = new QPushButton(mainGroup);
     animated->setText(tr("Animate"));
     animated->setCheckable(true);

     QPushButton *showSourceButton = new QPushButton(mainGroup);
     showSourceButton->setText(tr("Show Source"));
 #ifdef QT_OPENGL_SUPPORT
     QPushButton *enableOpenGLButton = new QPushButton(mainGroup);
     enableOpenGLButton->setText(tr("Use OpenGL"));
     enableOpenGLButton->setCheckable(true);
     enableOpenGLButton->setChecked(m_renderer->usesOpenGL());
     if (!QGLFormat::hasOpenGL())
         enableOpenGLButton->hide();
 #endif
     QPushButton *whatsThisButton = new QPushButton(mainGroup);
     whatsThisButton->setText(tr("What's This?"));
     whatsThisButton->setCheckable(true);

     // Layouts:
     QVBoxLayout *penWidthLayout = new QVBoxLayout(penWidthGroup);
     penWidthLayout->addWidget(penWidth);

     QVBoxLayout * mainLayout = new QVBoxLayout(this);
     mainLayout->setMargin(0);
     mainLayout->addWidget(mainGroup);

     QVBoxLayout *mainGroupLayout = new QVBoxLayout(mainGroup);
     mainGroupLayout->setMargin(3);
     mainGroupLayout->addWidget(m_capGroup);
     mainGroupLayout->addWidget(m_joinGroup);
     mainGroupLayout->addWidget(m_styleGroup);
     mainGroupLayout->addWidget(penWidthGroup);
     mainGroupLayout->addWidget(m_pathModeGroup);
     mainGroupLayout->addWidget(animated);
     mainGroupLayout->addStretch(1);
     mainGroupLayout->addWidget(showSourceButton);
 #ifdef QT_OPENGL_SUPPORT
     mainGroupLayout->addWidget(enableOpenGLButton);
 #endif
     mainGroupLayout->addWidget(whatsThisButton);

     // Set up connections
     connect(animated, SIGNAL(toggled(bool)),
             m_renderer, SLOT(setAnimation(bool)));

     connect(penWidth, SIGNAL(valueChanged(int)),
             m_renderer, SLOT(setPenWidth(int)));

     connect(showSourceButton, SIGNAL(clicked()), m_renderer, SLOT(showSource()));
 #ifdef QT_OPENGL_SUPPORT
     connect(enableOpenGLButton, SIGNAL(clicked(bool)), m_renderer, SLOT(enableOpenGL(bool)));
 #endif
     connect(whatsThisButton, SIGNAL(clicked(bool)), m_renderer, SLOT(setDescriptionEnabled(bool)));
     connect(m_renderer, SIGNAL(descriptionEnabledChanged(bool)),
             whatsThisButton, SLOT(setChecked(bool)));

     // Set the defaults
     animated->setChecked(true);
     penWidth->setValue(50);

 }

 void PathStrokeControls::layoutForSmallScreens()
 {
     createCommonControls(this);

     m_capGroup->layout()->setMargin(0);
     m_joinGroup->layout()->setMargin(0);
     m_styleGroup->layout()->setMargin(0);
     m_pathModeGroup->layout()->setMargin(0);

     QPushButton* okBtn = new QPushButton(tr("OK"), this);
     okBtn->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
     okBtn->setMinimumSize(100,okBtn->minimumSize().height());

     QPushButton* quitBtn = new QPushButton(tr("Quit"), this);
     quitBtn->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
     quitBtn->setMinimumSize(100, okBtn->minimumSize().height());

     QLabel *penWidthLabel = new QLabel(tr(" Width:"));
     QSlider *penWidth = new QSlider(Qt::Horizontal, this);
     penWidth->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
     penWidth->setRange(0, 500);

 #ifdef QT_OPENGL_SUPPORT
     QPushButton *enableOpenGLButton = new QPushButton(this);
     enableOpenGLButton->setText(tr("Use OpenGL"));
     enableOpenGLButton->setCheckable(true);
     enableOpenGLButton->setChecked(m_renderer->usesOpenGL());
     if (!QGLFormat::hasOpenGL())
         enableOpenGLButton->hide();
 #endif

     // Layouts:
     QHBoxLayout *penWidthLayout = new QHBoxLayout(0);
     penWidthLayout->addWidget(penWidthLabel, 0, Qt::AlignRight);
     penWidthLayout->addWidget(penWidth);

     QVBoxLayout *leftLayout = new QVBoxLayout(0);
     leftLayout->addWidget(m_capGroup);
     leftLayout->addWidget(m_joinGroup);
 #ifdef QT_OPENGL_SUPPORT
     leftLayout->addWidget(enableOpenGLButton);
 #endif
     leftLayout->addLayout(penWidthLayout);

     QVBoxLayout *rightLayout = new QVBoxLayout(0);
     rightLayout->addWidget(m_styleGroup);
     rightLayout->addWidget(m_pathModeGroup);

     QGridLayout *mainLayout = new QGridLayout(this);
     mainLayout->setMargin(0);

     // Add spacers around the form items so we don't look stupid at higher resolutions
     mainLayout->addItem(new QSpacerItem(0,0), 0, 0, 1, 4);
     mainLayout->addItem(new QSpacerItem(0,0), 1, 0, 2, 1);
     mainLayout->addItem(new QSpacerItem(0,0), 1, 3, 2, 1);
     mainLayout->addItem(new QSpacerItem(0,0), 3, 0, 1, 4);

     mainLayout->addLayout(leftLayout, 1, 1);
     mainLayout->addLayout(rightLayout, 1, 2);
     mainLayout->addWidget(quitBtn, 2, 1, Qt::AlignHCenter | Qt::AlignTop);
     mainLayout->addWidget(okBtn, 2, 2, Qt::AlignHCenter | Qt::AlignTop);

 #ifdef QT_OPENGL_SUPPORT
     connect(enableOpenGLButton, SIGNAL(clicked(bool)), m_renderer, SLOT(enableOpenGL(bool)));
 #endif

     connect(penWidth, SIGNAL(valueChanged(int)), m_renderer, SLOT(setPenWidth(int)));
     connect(quitBtn, SIGNAL(clicked()), this, SLOT(emitQuitSignal()));
     connect(okBtn, SIGNAL(clicked()), this, SLOT(emitOkSignal()));

     m_renderer->setAnimation(true);
     penWidth->setValue(50);
 }

 void PathStrokeControls::emitQuitSignal()
 {   emit quitPressed();  }

 void PathStrokeControls::emitOkSignal()
 {   emit okPressed();   }

 PathStrokeWidget::PathStrokeWidget(bool smallScreen)
 {
     setWindowTitle(tr("Path Stroking"));

     // Widget construction and property setting
     m_renderer = new PathStrokeRenderer(this, smallScreen);

     m_controls = new PathStrokeControls(0, m_renderer, smallScreen);

     // Layouting
     QHBoxLayout *viewLayout = new QHBoxLayout(this);
     viewLayout->addWidget(m_renderer);

     if (!smallScreen)
         viewLayout->addWidget(m_controls);

     m_renderer->loadSourceFile(":res/pathstroke/pathstroke.cpp");
     m_renderer->loadDescription(":res/pathstroke/pathstroke.html");

     connect(m_renderer, SIGNAL(clicked()), this, SLOT(showControls()));
     connect(m_controls, SIGNAL(okPressed()), this, SLOT(hideControls()));
     connect(m_controls, SIGNAL(quitPressed()), QApplication::instance(), SLOT(quit()));
 }

 void PathStrokeWidget::showControls()
 {
     m_controls->showFullScreen();
 }

 void PathStrokeWidget::hideControls()
 {
     m_controls->hide();
 }

 void PathStrokeWidget::setStyle( QStyle * style )
 {
     QWidget::setStyle(style);
     if (m_controls != 0)
     {
         m_controls->setStyle(style);

         QList<QWidget *> widgets = qFindChildren<QWidget *>(m_controls);
         foreach (QWidget *w, widgets)
             w->setStyle(style);
     }
 }

 PathStrokeRenderer::PathStrokeRenderer(QWidget *parent, bool smallScreen)
     : ArthurFrame(parent)
 {
     m_smallScreen = smallScreen;
     m_pointSize = 10;
     m_activePoint = -1;
     m_capStyle = Qt::FlatCap;
     m_joinStyle = Qt::BevelJoin;
     m_pathMode = CurveMode;
     m_penWidth = 1;
     m_penStyle = Qt::SolidLine;
     m_wasAnimated = true;
     setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
     setAttribute(Qt::WA_AcceptTouchEvents);
 }

 void PathStrokeRenderer::paint(QPainter *painter)
 {
     if (m_points.isEmpty())
         initializePoints();

     painter->setRenderHint(QPainter::Antialiasing);

     QPalette pal = palette();
     painter->setPen(Qt::NoPen);

     // Construct the path
     QPainterPath path;
     path.moveTo(m_points.at(0));

     if (m_pathMode == LineMode) {
         for (int i=1; i<m_points.size(); ++i) {
             path.lineTo(m_points.at(i));
         }
     } else {
         int i=1;
         while (i + 2 < m_points.size()) {
             path.cubicTo(m_points.at(i), m_points.at(i+1), m_points.at(i+2));
             i += 3;
         }
         while (i < m_points.size()) {
             path.lineTo(m_points.at(i));
             ++i;
         }
     }

     // Draw the path
     {
         QColor lg = Qt::red;

         // The "custom" pen
         if (m_penStyle == Qt::NoPen) {
             QPainterPathStroker stroker;
             stroker.setWidth(m_penWidth);
             stroker.setJoinStyle(m_joinStyle);
             stroker.setCapStyle(m_capStyle);

             QVector<qreal> dashes;
             qreal space = 4;
             dashes << 1 << space
                    << 3 << space
                    << 9 << space
                    << 27 << space
                    << 9 << space
                    << 3 << space;
             stroker.setDashPattern(dashes);
             QPainterPath stroke = stroker.createStroke(path);
             painter->fillPath(stroke, lg);

         } else {
             QPen pen(lg, m_penWidth, m_penStyle, m_capStyle, m_joinStyle);
             painter->strokePath(path, pen);
         }
     }

     if (1) {
         // Draw the control points
         painter->setPen(QColor(50, 100, 120, 200));
         painter->setBrush(QColor(200, 200, 210, 120));
         for (int i=0; i<m_points.size(); ++i) {
             QPointF pos = m_points.at(i);
             painter->drawEllipse(QRectF(pos.x() - m_pointSize,
                                        pos.y() - m_pointSize,
                                        m_pointSize*2, m_pointSize*2));
         }
         painter->setPen(QPen(Qt::lightGray, 0, Qt::SolidLine));
         painter->setBrush(Qt::NoBrush);
         painter->drawPolyline(m_points);
     }

 }

 void PathStrokeRenderer::initializePoints()
 {
     const int count = 7;
     m_points.clear();
     m_vectors.clear();

     QMatrix m;
     qreal rot = 360 / count;
     QPointF center(width() / 2, height() / 2);
     QMatrix vm;
     vm.shear(2, -1);
     vm.scale(3, 3);

     for (int i=0; i<count; ++i) {
         m_vectors << QPointF(.1f, .25f) * (m * vm);
         m_points << QPointF(0, 100) * m + center;
         m.rotate(rot);
     }
 }

 void PathStrokeRenderer::updatePoints()
 {
     qreal pad = 10;
     qreal left = pad;
     qreal right = width() - pad;
     qreal top = pad;
     qreal bottom = height() - pad;

     Q_ASSERT(m_points.size() == m_vectors.size());
     for (int i=0; i<m_points.size(); ++i) {
         QPointF pos = m_points.at(i);
         QPointF vec = m_vectors.at(i);
         pos += vec;
         if (pos.x() < left || pos.x() > right) {
             vec.setX(-vec.x());
             pos.setX(pos.x() < left ? left : right);
         } if (pos.y() < top || pos.y() > bottom) {
             vec.setY(-vec.y());
             pos.setY(pos.y() < top ? top : bottom);
         }
         m_points[i] = pos;
         m_vectors[i] = vec;
     }
     update();
 }

 void PathStrokeRenderer::mousePressEvent(QMouseEvent *e)
 {
     if (!m_fingerPointMapping.isEmpty())
         return;
     setDescriptionEnabled(false);
     m_activePoint = -1;
     qreal distance = -1;
     for (int i=0; i<m_points.size(); ++i) {
         qreal d = QLineF(e->pos(), m_points.at(i)).length();
         if ((distance < 0 && d < 8 * m_pointSize) || d < distance) {
             distance = d;
             m_activePoint = i;
         }
     }

     if (m_activePoint != -1) {
         m_wasAnimated = m_timer.isActive();
         setAnimation(false);
         mouseMoveEvent(e);
     }

     // If we're not running in small screen mode, always assume we're dragging
     m_mouseDrag = !m_smallScreen;
     m_mousePress = e->pos();
 }

 void PathStrokeRenderer::mouseMoveEvent(QMouseEvent *e)
 {
     if (!m_fingerPointMapping.isEmpty())
         return;
     // If we've moved more then 25 pixels, assume user is dragging
     if (!m_mouseDrag && QPoint(m_mousePress - e->pos()).manhattanLength() > 25)
         m_mouseDrag = true;

     if (m_mouseDrag && m_activePoint >= 0 && m_activePoint < m_points.size()) {
         m_points[m_activePoint] = e->pos();
         update();
     }
 }

 void PathStrokeRenderer::mouseReleaseEvent(QMouseEvent *)
 {
     if (!m_fingerPointMapping.isEmpty())
         return;
     m_activePoint = -1;
     setAnimation(m_wasAnimated);

     if (!m_mouseDrag && m_smallScreen)
         emit clicked();
 }

 void PathStrokeRenderer::timerEvent(QTimerEvent *e)
 {
     if (e->timerId() == m_timer.timerId()) {
         updatePoints();
         QApplication::syncX();
     } // else if (e->timerId() == m_fpsTimer.timerId()) {
 //         emit frameRate(m_frameCount);
 //         m_frameCount = 0;
 //     }
 }

 bool PathStrokeRenderer::event(QEvent *e)
 {
     bool touchBegin = false;
     switch (e->type()) {
     case QEvent::TouchBegin:
         touchBegin = true;
     case QEvent::TouchUpdate:
         {
             const QTouchEvent *const event = static_cast<const QTouchEvent*>(e);
             const QList<QTouchEvent::TouchPoint> points = event->touchPoints();
             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();
                         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 * m_pointSize) || d < distance) {
                                 distance = d;
                                 activePoint = i;
                             }
                         }
                         if (activePoint != -1) {
                             m_fingerPointMapping.insert(touchPoint.id(), activePoint);
                             m_points[activePoint] = touchPoint.pos();
                         }
                     }
                     break;
                 case Qt::TouchPointReleased:
                     {
                         // move the point and release
                         QHash<int,int>::iterator it = m_fingerPointMapping.find(id);
                         m_points[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)
                             m_points[pointIdx] = touchPoint.pos();
                     }
                     break;
                 default:
                     break;
                 }
             }
             if (m_fingerPointMapping.isEmpty()) {
                 e->ignore();
                 return false;
             } else {
                 if (touchBegin) {
                     m_wasAnimated = m_timer.isActive();
                     setAnimation(false);
                 }
                 update();
                 return true;
             }
         }
         break;
     case QEvent::TouchEnd:
         if (m_fingerPointMapping.isEmpty()) {
             e->ignore();
             return false;
         }
         m_fingerPointMapping.clear();
         setAnimation(m_wasAnimated);
         return true;
         break;
     default:
         break;
     }
     return QWidget::event(e);
 }

 void PathStrokeRenderer::setAnimation(bool animation)
 {
     m_timer.stop();
 //     m_fpsTimer.stop();

     if (animation) {
         m_timer.start(25, this);
 //         m_fpsTimer.start(1000, this);
 //         m_frameCount = 0;
     }
 }

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Le blog Digia au hasard

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Créer des applications avec un style Metro avec Qt, exemples en QML et C++, un article de Digia Qt traduit par Thibaut Cuvelier

Le blog Digia est l'endroit privilégié pour la communication sur l'édition commerciale de Qt, où des réponses publiques sont apportées aux questions les plus posées au support. Lire l'article.

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Qt dans le magazine

Cette page est une traduction d'une page de la documentation de Qt, écrite par Nokia Corporation and/or its subsidiary(-ies). Les éventuels problèmes résultant d'une mauvaise traduction ne sont pas imputables à Nokia. Qt 4.6-snapshot
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