268 lines
7.5 KiB
C++
268 lines
7.5 KiB
C++
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/****************************************************************************
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**
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** Copyright (C) 2011 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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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "imagewidget.h"
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#include <QtGui>
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//! [constructor]
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ImageWidget::ImageWidget(QWidget *parent)
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: QWidget(parent),
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position(0),
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horizontalOffset(0),
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verticalOffset(0),
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rotationAngle(0),
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scaleFactor(1),
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currentStepScaleFactor(1)
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{
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setMinimumSize(QSize(100,100));
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//! [enable gestures]
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grabGesture(Qt::PanGesture);
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grabGesture(Qt::PinchGesture);
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grabGesture(Qt::SwipeGesture);
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//! [enable gestures]
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}
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//! [constructor]
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//! [event handler]
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bool ImageWidget::event(QEvent *event)
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{
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if (event->type() == QEvent::Gesture)
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return gestureEvent(static_cast<QGestureEvent*>(event));
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return QWidget::event(event);
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}
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//! [event handler]
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void ImageWidget::paintEvent(QPaintEvent*)
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{
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QPainter p(this);
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float iw = currentImage.width();
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float ih = currentImage.height();
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float wh = height();
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float ww = width();
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p.translate(ww/2, wh/2);
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p.translate(horizontalOffset, verticalOffset);
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p.rotate(rotationAngle);
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p.scale(currentStepScaleFactor * scaleFactor, currentStepScaleFactor * scaleFactor);
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p.translate(-iw/2, -ih/2);
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p.drawImage(0, 0, currentImage);
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}
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void ImageWidget::mouseDoubleClickEvent(QMouseEvent *)
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{
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rotationAngle = 0;
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scaleFactor = 1;
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currentStepScaleFactor = 1;
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verticalOffset = 0;
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horizontalOffset = 0;
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update();
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}
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//! [gesture event handler]
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bool ImageWidget::gestureEvent(QGestureEvent *event)
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{
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if (QGesture *swipe = event->gesture(Qt::SwipeGesture))
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swipeTriggered(static_cast<QSwipeGesture *>(swipe));
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else if (QGesture *pan = event->gesture(Qt::PanGesture))
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panTriggered(static_cast<QPanGesture *>(pan));
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if (QGesture *pinch = event->gesture(Qt::PinchGesture))
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pinchTriggered(static_cast<QPinchGesture *>(pinch));
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return true;
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}
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//! [gesture event handler]
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void ImageWidget::panTriggered(QPanGesture *gesture)
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{
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#ifndef QT_NO_CURSOR
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switch (gesture->state()) {
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case Qt::GestureStarted:
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case Qt::GestureUpdated:
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setCursor(Qt::SizeAllCursor);
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break;
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default:
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setCursor(Qt::ArrowCursor);
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}
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#endif
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QPointF delta = gesture->delta();
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horizontalOffset += delta.x();
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verticalOffset += delta.y();
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update();
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}
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void ImageWidget::pinchTriggered(QPinchGesture *gesture)
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{
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QPinchGesture::ChangeFlags changeFlags = gesture->changeFlags();
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if (changeFlags & QPinchGesture::RotationAngleChanged) {
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qreal value = gesture->property("rotationAngle").toReal();
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qreal lastValue = gesture->property("lastRotationAngle").toReal();
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rotationAngle += value - lastValue;
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}
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if (changeFlags & QPinchGesture::ScaleFactorChanged) {
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qreal value = gesture->property("scaleFactor").toReal();
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currentStepScaleFactor = value;
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}
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if (gesture->state() == Qt::GestureFinished) {
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scaleFactor *= currentStepScaleFactor;
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currentStepScaleFactor = 1;
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}
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update();
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}
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//! [swipe function]
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void ImageWidget::swipeTriggered(QSwipeGesture *gesture)
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{
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if (gesture->state() == Qt::GestureFinished) {
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if (gesture->horizontalDirection() == QSwipeGesture::Left
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|| gesture->verticalDirection() == QSwipeGesture::Up)
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goPrevImage();
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else
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goNextImage();
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update();
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}
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}
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//! [swipe function]
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void ImageWidget::resizeEvent(QResizeEvent*)
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{
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update();
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}
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void ImageWidget::openDirectory(const QString &path)
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{
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this->path = path;
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QDir dir(path);
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QStringList nameFilters;
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nameFilters << "*.jpg" << "*.png";
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files = dir.entryList(nameFilters, QDir::Files|QDir::Readable, QDir::Name);
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position = 0;
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goToImage(0);
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update();
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}
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QImage ImageWidget::loadImage(const QString &fileName)
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{
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QImageReader reader(fileName);
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if (!reader.canRead()) {
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qDebug() << fileName << ": can't load image";
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return QImage();
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}
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QImage image;
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if (!reader.read(&image)) {
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qDebug() << fileName << ": corrupted image";
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return QImage();
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}
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return image;
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}
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void ImageWidget::goNextImage()
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{
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if (files.isEmpty())
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return;
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if (position < files.size()-1) {
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++position;
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prevImage = currentImage;
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currentImage = nextImage;
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if (position+1 < files.size())
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nextImage = loadImage(path+QLatin1String("/")+files.at(position+1));
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else
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nextImage = QImage();
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}
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update();
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}
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void ImageWidget::goPrevImage()
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{
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if (files.isEmpty())
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return;
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if (position > 0) {
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--position;
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nextImage = currentImage;
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currentImage = prevImage;
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if (position > 0)
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prevImage = loadImage(path+QLatin1String("/")+files.at(position-1));
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else
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prevImage = QImage();
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}
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update();
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}
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void ImageWidget::goToImage(int index)
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{
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if (files.isEmpty())
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return;
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if (index < 0 || index >= files.size()) {
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qDebug() << "goToImage: invalid index: " << index;
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return;
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}
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if (index == position+1) {
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goNextImage();
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return;
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}
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if (position > 0 && index == position-1) {
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goPrevImage();
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return;
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}
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position = index;
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if (index > 0)
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prevImage = loadImage(path+QLatin1String("/")+files.at(position-1));
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else
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prevImage = QImage();
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currentImage = loadImage(path+QLatin1String("/")+files.at(position));
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if (position+1 < files.size())
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nextImage = loadImage(path+QLatin1String("/")+files.at(position+1));
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else
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nextImage = QImage();
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update();
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}
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