ImageViewer: Reimplemented as a new plugin

Merge-request: 2165
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

src/plugins/imageviewer/imageview.cpp

@@ -0,0 +1,221 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Copyright (c) 2010 Denis Mingulov.
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of Qt Creator.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include "imageview.h"
+
+#include <QtCore/QFile>
+#include <QtGui/QWheelEvent>
+#include <QtGui/QMouseEvent>
+#include <QtGui/QGraphicsRectItem>
+#include <QtGui/QPixmap>
+#include <QtSvg/QGraphicsSvgItem>
+#include <QtGui/QImageReader>
+#include <qmath.h>
+
+
+namespace ImageViewer {
+namespace Constants {
+    const qreal DEFAULT_SCALE_FACTOR = 1.2;
+}
+
+namespace Internal {
+
+struct ImageViewPrivate
+{
+    ImageViewPrivate() : imageItem(0), backgroundItem(0), outlineItem(0) {}
+    QGraphicsItem *imageItem;
+    QGraphicsRectItem *backgroundItem;
+    QGraphicsRectItem *outlineItem;
+};
+
+ImageView::ImageView(QWidget *parent)
+    : QGraphicsView(parent),
+    d_ptr(new ImageViewPrivate())
+{
+    setScene(new QGraphicsScene(this));
+    setTransformationAnchor(AnchorUnderMouse);
+    setDragMode(ScrollHandDrag);
+    setViewportUpdateMode(FullViewportUpdate);
+
+    // Prepare background check-board pattern
+    QPixmap tilePixmap(64, 64);
+    tilePixmap.fill(Qt::white);
+    QPainter tilePainter(&tilePixmap);
+    QColor color(220, 220, 220);
+    tilePainter.fillRect(0, 0, 0x20, 0x20, color);
+    tilePainter.fillRect(0x20, 0x20, 0x20, 0x20, color);
+    tilePainter.end();
+
+    setBackgroundBrush(tilePixmap);
+}
+
+ImageView::~ImageView()
+{
+
+}
+
+void ImageView::drawBackground(QPainter *p, const QRectF &)
+{
+    p->save();
+    p->resetTransform();
+    p->drawTiledPixmap(viewport()->rect(), backgroundBrush().texture());
+    p->restore();
+}
+
+bool ImageView::openFile(QString fileName)
+{
+    bool isSvg = false;
+    QByteArray format = QImageReader::imageFormat(fileName);
+
+    // if it is impossible to recognize a file format - file will not be open correctly
+    if (format.isEmpty())
+        return false;
+
+    if (format.startsWith("svg"))
+        isSvg = true;
+
+    QGraphicsScene *s = scene();
+
+    bool drawBackground = (d_ptr->backgroundItem ? d_ptr->backgroundItem->isVisible() : false);
+    bool drawOutline = (d_ptr->outlineItem ? d_ptr->outlineItem->isVisible() : true);
+
+    s->clear();
+    resetTransform();
+
+    // image
+    if (isSvg) {
+        d_ptr->imageItem = new QGraphicsSvgItem(fileName);
+    } else {
+        QPixmap pixmap(fileName);
+        d_ptr->imageItem = new QGraphicsPixmapItem(pixmap);
+    }
+    d_ptr->imageItem->setFlags(QGraphicsItem::ItemClipsToShape);
+    d_ptr->imageItem->setCacheMode(QGraphicsItem::NoCache);
+    d_ptr->imageItem->setZValue(0);
+
+    // background item
+    d_ptr->backgroundItem = new QGraphicsRectItem(d_ptr->imageItem->boundingRect());
+    d_ptr->backgroundItem->setBrush(Qt::white);
+    d_ptr->backgroundItem->setPen(Qt::NoPen);
+    d_ptr->backgroundItem->setVisible(drawBackground);
+    d_ptr->backgroundItem->setZValue(-1);
+
+    // outline
+    d_ptr->outlineItem = new QGraphicsRectItem(d_ptr->imageItem->boundingRect());
+    QPen outline(Qt::black, 2, Qt::DashLine);
+    outline.setCosmetic(true);
+    d_ptr->outlineItem->setPen(outline);
+    d_ptr->outlineItem->setBrush(Qt::NoBrush);
+    d_ptr->outlineItem->setVisible(drawOutline);
+    d_ptr->outlineItem->setZValue(1);
+
+    s->addItem(d_ptr->backgroundItem);
+    s->addItem(d_ptr->imageItem);
+    s->addItem(d_ptr->outlineItem);
+
+    // if image size is 0x0, then it is not loaded
+    if (d_ptr->imageItem->boundingRect().height() == 0 && d_ptr->imageItem->boundingRect().width() == 0)
+        return false;
+    emitScaleFactor();
+
+    return true;
+}
+
+void ImageView::setViewBackground(bool enable)
+{
+    if (!d_ptr->backgroundItem)
+          return;
+
+    d_ptr->backgroundItem->setVisible(enable);
+}
+
+void ImageView::setViewOutline(bool enable)
+{
+    if (!d_ptr->outlineItem)
+        return;
+
+    d_ptr->outlineItem->setVisible(enable);
+}
+
+void ImageView::doScale(qreal factor)
+{
+    scale(factor, factor);
+    emitScaleFactor();
+}
+
+void ImageView::wheelEvent(QWheelEvent *event)
+{
+    qreal factor = qPow(Constants::DEFAULT_SCALE_FACTOR, event->delta() / 240.0);
+    doScale(factor);
+    event->accept();
+}
+
+void ImageView::zoomIn()
+{
+    doScale(Constants::DEFAULT_SCALE_FACTOR);
+}
+
+void ImageView::zoomOut()
+{
+    doScale(1. / Constants::DEFAULT_SCALE_FACTOR);
+}
+
+void ImageView::resetToOriginalSize()
+{
+    resetTransform();
+    emitScaleFactor();
+}
+
+void ImageView::fitToScreen()
+{
+    fitInView(d_ptr->imageItem, Qt::KeepAspectRatio);
+    emitScaleFactor();
+}
+
+void ImageView::emitScaleFactor()
+{
+    // get scale factor directly from the transform matrix
+    qreal factor = transform().m11();
+    emit scaleFactorChanged(factor);
+}
+
+} // namespace Internal
+} // namespace ImageView