/**************************************************************************** ** ** 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 examples 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. ** ** ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "imagewidget.h" #include //! [constructor] ImageWidget::ImageWidget(QWidget *parent) : QWidget(parent), position(0), horizontalOffset(0), verticalOffset(0), rotationAngle(0), scaleFactor(1) { setMinimumSize(QSize(100,100)); //! [enable gestures] grabGesture(Qt::PanGesture); grabGesture(Qt::PinchGesture); grabGesture(Qt::SwipeGesture); //! [enable gestures] } //! [constructor] //! [event handler] bool ImageWidget::event(QEvent *event) { if (event->type() == QEvent::Gesture) return gestureEvent(static_cast(event)); return QWidget::event(event); } //! [event handler] void ImageWidget::paintEvent(QPaintEvent*) { QPainter p(this); p.fillRect(rect(), Qt::white); float iw = currentImage.width(); float ih = currentImage.height(); float wh = height(); float ww = width(); p.translate(ww/2, wh/2); p.translate(horizontalOffset, verticalOffset); p.rotate(rotationAngle); p.scale(scaleFactor, scaleFactor); p.translate(-iw/2, -ih/2); p.drawImage(0, 0, currentImage); } void ImageWidget::mouseDoubleClickEvent(QMouseEvent *) { rotationAngle = 0; scaleFactor = 1; verticalOffset = 0; horizontalOffset = 0; update(); } //! [gesture event handler] bool ImageWidget::gestureEvent(QGestureEvent *event) { if (QGesture *pan = event->gesture(Qt::PanGesture)) panTriggered(static_cast(pan)); if (QGesture *pinch = event->gesture(Qt::PinchGesture)) pinchTriggered(static_cast(pinch)); if (QGesture *swipe = event->gesture(Qt::SwipeGesture)) swipeTriggered(static_cast(swipe)); return true; } //! [gesture event handler] void ImageWidget::panTriggered(QPanGesture *gesture) { #ifndef QT_NO_CURSOR switch (gesture->state()) { case Qt::GestureStarted: case Qt::GestureUpdated: setCursor(Qt::SizeAllCursor); break; default: setCursor(Qt::ArrowCursor); } #endif QPointF delta = gesture->delta(); horizontalOffset += delta.x(); verticalOffset += delta.y(); update(); } void ImageWidget::pinchTriggered(QPinchGesture *gesture) { QPinchGesture::ChangeFlags changeFlags = gesture->changeFlags(); if (changeFlags & QPinchGesture::RotationAngleChanged) { qreal value = gesture->property("rotationAngle").toReal(); qreal lastValue = gesture->property("lastRotationAngle").toReal(); rotationAngle += value - lastValue; } if (changeFlags & QPinchGesture::ScaleFactorChanged) { qreal value = gesture->property("scaleFactor").toReal(); qreal lastValue = gesture->property("lastScaleFactor").toReal(); scaleFactor += value - lastValue; } update(); } //! [swipe function] void ImageWidget::swipeTriggered(QSwipeGesture *gesture) { if (gesture->horizontalDirection() == QSwipeGesture::Left || gesture->verticalDirection() == QSwipeGesture::Up) goPrevImage(); else goNextImage(); update(); } //! [swipe function] void ImageWidget::resizeEvent(QResizeEvent*) { update(); } void ImageWidget::openDirectory(const QString &path) { this->path = path; QDir dir(path); QStringList nameFilters; nameFilters << "*.jpg" << "*.png"; files = dir.entryList(nameFilters, QDir::Files|QDir::Readable, QDir::Name); position = 0; goToImage(0); update(); } QImage ImageWidget::loadImage(const QString &fileName) { QImageReader reader(fileName); if (!reader.canRead()) { qDebug() << fileName << ": can't load image"; return QImage(); } QImage image; if (!reader.read(&image)) { qDebug() << fileName << ": corrupted image"; return QImage(); } return image; } void ImageWidget::goNextImage() { if (files.isEmpty()) return; if (position < files.size()-1) { ++position; prevImage = currentImage; currentImage = nextImage; if (position+1 < files.size()) nextImage = loadImage(path+QLatin1String("/")+files.at(position+1)); else nextImage = QImage(); } update(); } void ImageWidget::goPrevImage() { if (files.isEmpty()) return; if (position > 0) { --position; nextImage = currentImage; currentImage = prevImage; if (position > 0) prevImage = loadImage(path+QLatin1String("/")+files.at(position-1)); else prevImage = QImage(); } update(); } void ImageWidget::goToImage(int index) { if (files.isEmpty()) return; if (index < 0 || index >= files.size()) { qDebug() << "goToImage: invalid index: " << index; return; } if (index == position+1) { goNextImage(); return; } if (position > 0 && index == position-1) { goPrevImage(); return; } position = index; if (index > 0) prevImage = loadImage(path+QLatin1String("/")+files.at(position-1)); else prevImage = QImage(); currentImage = loadImage(path+QLatin1String("/")+files.at(position)); if (position+1 < files.size()) nextImage = loadImage(path+QLatin1String("/")+files.at(position+1)); else nextImage = QImage(); update(); }