/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the examples of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include <QtGui>+
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+
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#include "scribblearea.h"+
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+
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//! [0]+
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ScribbleArea::ScribbleArea(QWidget *parent)+
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    : QWidget(parent)+
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{+
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    setAttribute(Qt::WA_AcceptTouchEvents);+
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    setAttribute(Qt::WA_StaticContents);+
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    modified = false;+
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+
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    myPenColors+
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            << QColor("green")+
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            << QColor("purple")+
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            << QColor("red")+
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            << QColor("blue")+
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            << QColor("yellow")+
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+
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            << QColor("pink")+
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            << QColor("orange")+
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            << QColor("brown")+
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            << QColor("grey")+
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            << QColor("black");+
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}+
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//! [0]+
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+
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//! [1]+
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bool ScribbleArea::openImage(const QString &fileName)+
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//! [1] //! [2]+
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{+
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    QImage loadedImage;+
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    if (!loadedImage.load(fileName))+
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        return false;+
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+
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    QSize newSize = loadedImage.size().expandedTo(size());+
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    resizeImage(&loadedImage, newSize);+
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    image = loadedImage;+
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    modified = false;+
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    update();+
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    return true;+
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}+
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//! [2]+
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+
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//! [3]+
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bool ScribbleArea::saveImage(const QString &fileName, const char *fileFormat)+
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//! [3] //! [4]+
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{+
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    QImage visibleImage = image;+
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    resizeImage(&visibleImage, size());+
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+
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    if (visibleImage.save(fileName, fileFormat)) {+
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        modified = false;+
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        return true;+
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    } else {+
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        return false;+
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    }+
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}+
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//! [4]+
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+
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//! [9]+
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void ScribbleArea::clearImage()+
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//! [9] //! [10]+
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{+
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    image.fill(qRgb(255, 255, 255));+
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    modified = true;+
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    update();+
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}+
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//! [10]+
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+
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//! [12] //! [13]+
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void ScribbleArea::paintEvent(QPaintEvent *event)+
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//! [13] //! [14]+
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{+
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    QPainter painter(this);+
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    const QRect rect = event->rect();+
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    painter.drawImage(rect.topLeft(), image, rect);+
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}+
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//! [14]+
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+
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//! [15]+
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void ScribbleArea::resizeEvent(QResizeEvent *event)+
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//! [15] //! [16]+
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{+
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    if (width() > image.width() || height() > image.height()) {+
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        int newWidth = qMax(width() + 128, image.width());+
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        int newHeight = qMax(height() + 128, image.height());+
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        resizeImage(&image, QSize(newWidth, newHeight));+
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        update();+
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    }+
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    QWidget::resizeEvent(event);+
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}+
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//! [16]+
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+
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//! [19]+
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void ScribbleArea::resizeImage(QImage *image, const QSize &newSize)+
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//! [19] //! [20]+
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{+
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    if (image->size() == newSize)+
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        return;+
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+
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    QImage newImage(newSize, QImage::Format_RGB32);+
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    newImage.fill(qRgb(255, 255, 255));+
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    QPainter painter(&newImage);+
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    painter.drawImage(QPoint(0, 0), *image);+
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    *image = newImage;+
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}+
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//! [20]+
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+
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//! [21]+
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void ScribbleArea::print()+
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{+
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#ifndef QT_NO_PRINTER+
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    QPrinter printer(QPrinter::HighResolution);+
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+
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    QPrintDialog *printDialog = new QPrintDialog(&printer, this);+
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//! [21] //! [22]+
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    if (printDialog->exec() == QDialog::Accepted) {+
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        QPainter painter(&printer);+
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        QRect rect = painter.viewport();+
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        QSize size = image.size();+
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        size.scale(rect.size(), Qt::KeepAspectRatio);+
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        painter.setViewport(rect.x(), rect.y(), size.width(), size.height());+
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        painter.setWindow(image.rect());+
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        painter.drawImage(0, 0, image);+
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    }+
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#endif // QT_NO_PRINTER+
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}+
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//! [22]+
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+
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bool ScribbleArea::event(QEvent *event)+
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{+
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    switch (event->type()) {+
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    case QEvent::TouchBegin:+
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    case QEvent::TouchUpdate:+
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    case QEvent::TouchEnd:+
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    {+
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        QList<QTouchEvent::TouchPoint> touchPoints = static_cast<QTouchEvent *>(event)->touchPoints();+
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        foreach (const QTouchEvent::TouchPoint &touchPoint, touchPoints) {+
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            switch (touchPoint.state()) {+
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            case Qt::TouchPointStationary:+
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                // don't do anything if this touch point hasn't moved+
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                continue;+
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            default:+
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                {+
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                    QRectF rect = touchPoint.rect();+
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                    if (rect.isEmpty()) {+
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                        qreal diameter = qreal(50) * touchPoint.pressure();+
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                        rect.setSize(QSizeF(diameter, diameter));+
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                    }+
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+
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                    QPainter painter(&image);+
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                    painter.setPen(Qt::NoPen);+
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                    painter.setBrush(myPenColors.at(touchPoint.id() % myPenColors.count()));+
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                    painter.drawEllipse(rect);+
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                    painter.end();+
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+
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                    modified = true;+
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                    int rad = 2;+
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                    update(rect.toRect().adjusted(-rad,-rad, +rad, +rad));+
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                }+
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                break;+
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            }+
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        }+
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        break;+
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    }+
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    default:+
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        return QWidget::event(event);+
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    }+
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    return true;+
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}+
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