164 lines
3.7 KiB
C++
164 lines
3.7 KiB
C++
#include "image_view.h"
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#include <QBuffer>
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#include <QDebug>
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#include <QEvent>
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#include <QGraphicsPixmapItem>
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#include <QGraphicsScene>
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#include <QMouseEvent>
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#include <QScrollBar>
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#include <QWheelEvent>
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#include <qmath.h>
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ImageView::ImageView(QWidget * parent): QGraphicsView(parent), item(new QGraphicsPixmapItem) {
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setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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setDragMode(QGraphicsView::NoDrag);
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setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
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setScene(new QGraphicsScene());
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setRenderHint(QPainter::Antialiasing, true);
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setRenderHint(QPainter::SmoothPixmapTransform, true);
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item->setTransformationMode(Qt::SmoothTransformation);
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item->setFlags(QGraphicsItem::GraphicsItemFlags());
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scene()->addItem(item);
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viewport()->setAutoFillBackground(false);
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viewport()->installEventFilter(this);
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autofit_ = true;
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interactive_ = false;
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}
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ImageView::~ImageView() {
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delete item;
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}
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QPixmap ImageView::pixmap() const {
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return map;
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}
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void ImageView::setPixmap(QPixmap pixmap) {
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map = pixmap;
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adjustView();
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}
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void ImageView::setViewInteractive(bool yes) {
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interactive_ = yes;
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}
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void ImageView::setImage(const QImage & i, bool save) {
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im_data.clear();
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if (i.isNull()) {
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item->setPixmap(QPixmap());
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map = QPixmap();
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return;
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}
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if (save) {
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QBuffer b(&im_data);
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b.open(QIODevice::ReadWrite);
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i.save(&b, "png");
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b.close();
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}
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map = QPixmap::fromImage(i);
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adjustView();
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}
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void ImageView::setImage(const QByteArray & i) {
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im_data = i;
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if (i.isEmpty()) {
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item->setPixmap(QPixmap());
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map = QPixmap();
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return;
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}
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map = QPixmap::fromImage(QImage::fromData(i));
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adjustView();
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}
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void ImageView::clear() {
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im_data.clear();
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item->setPixmap(QPixmap());
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map = QPixmap();
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}
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void ImageView::mouseDoubleClickEvent(QMouseEvent *) {
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autofit();
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}
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void ImageView::mousePressEvent(QMouseEvent * e) {
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QGraphicsView::mousePressEvent(e);
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emit clicked(mapToScene(e->pos()), e->buttons());
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}
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void ImageView::wheelEvent(QWheelEvent * e) {
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if (!e->modifiers().testFlag(Qt::ControlModifier) || !viewInteractive()) return;
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double scl = 1. + e->angleDelta().y() / 500.;
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autofit_ = false;
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scale(scl, scl);
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}
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bool ImageView::eventFilter(QObject * o, QEvent * e) {
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QMouseEvent * me = reinterpret_cast<QMouseEvent *>(e);
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switch (e->type()) {
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case QEvent::Resize: adjustView(); break;
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case QEvent::MouseButtonPress:
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prev_pos = me->pos();
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if (me->buttons().testFlag(Qt::RightButton) && !autofit_ && viewInteractive()) viewport()->setCursor(Qt::ClosedHandCursor);
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break;
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case QEvent::MouseButtonRelease:
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viewport()->unsetCursor();
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prev_pos = me->pos();
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break;
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case QEvent::MouseMove:
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if (me->buttons().testFlag(Qt::RightButton) && !autofit_ && viewInteractive()) {
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QPoint dp = QPoint(me->pos() - prev_pos);
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horizontalScrollBar()->setValue(horizontalScrollBar()->value() - dp.x());
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verticalScrollBar()->setValue(verticalScrollBar()->value() - dp.y());
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prev_pos = me->pos();
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}
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break;
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default: break;
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}
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return QGraphicsView::eventFilter(o, e);
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}
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void ImageView::adjustView() {
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QSize ws = size();
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#if QT_VERSION_MAJOR >= 5
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ws *= devicePixelRatio();
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#endif
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int nw = map.size().boundedTo(ws).width();
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item->setScale(1.);
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if (nw > 0) {
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qreal mp = map.width() / nw;
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if (mp > 1.) {
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QSize ss = map.size();
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item->setPixmap(map.scaled(map.size() / mp, Qt::KeepAspectRatio, Qt::SmoothTransformation));
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item->setScale(double(ss.width()) / item->pixmap().width());
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} else
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item->setPixmap(map);
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} else
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item->setPixmap(map);
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if (!autofit_) return;
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QRectF r = item->mapRectToScene(item->boundingRect());
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setSceneRect(r);
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fitInView(r, Qt::KeepAspectRatio);
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centerOn(r.center());
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}
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void ImageView::autofit() {
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autofit_ = true;
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adjustView();
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}
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