--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/gestures/imagegestures/imagewidget.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,265 @@
+/****************************************************************************
+**
+** 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 <QtGui>
+
+//! [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<QGestureEvent*>(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<QPanGesture*>(pan));
+ return true;
+ } else if (QGesture *pinch = event->gesture(Qt::PinchGesture)) {
+ pinchTriggered(static_cast<QPinchGesture*>(pinch));
+ return true;
+ } else if (QGesture *swipe = event->gesture(Qt::SwipeGesture)) {
+ swipeTriggered(static_cast<QSwipeGesture*>(swipe));
+ return true;
+ }
+ return false;
+}
+//! [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 lastOffset = gesture->offset();
+ horizontalOffset += lastOffset.x();
+ verticalOffset += lastOffset.y();
+ update();
+}
+
+void ImageWidget::pinchTriggered(QPinchGesture *gesture)
+{
+ QPinchGesture::WhatChanged whatChanged = gesture->whatChanged();
+ if (whatChanged & QPinchGesture::RotationAngleChanged) {
+ qreal value = gesture->property("rotationAngle").toReal();
+ qreal lastValue = gesture->property("lastRotationAngle").toReal();
+ rotationAngle += value - lastValue;
+ }
+ if (whatChanged & 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();
+}