git-svn-id: svn://db.shs.com.ru/libs@452 a8b55f48-bf90-11e4-a774-851b48703e85

qad/widgets/image_view.cpp

@@ -0,0 +1,133 @@
+#include "image_view.h"
+#include <QGraphicsScene>
+#include <QBuffer>
+#include <QEvent>
+#include <QMouseEvent>
+#include <QWheelEvent>
+#include <QDebug>
+#include <qmath.h>
+
+
+ImageView::ImageView(QWidget * parent): QGraphicsView(parent) {
+	setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+	setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+	setDragMode(QGraphicsView::NoDrag);
+	setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
+	setScene(new QGraphicsScene());
+	item.setTransformationMode(Qt::SmoothTransformation);
+	item.setFlags(0);
+	scene()->addItem(&item);
+	viewport()->installEventFilter(this);
+	autofit_ = true;
+}
+
+
+ImageView::~ImageView() {
+}
+
+
+QPixmap ImageView::pixmap() const {
+	return item.pixmap();
+}
+
+
+void ImageView::setPixmap(QPixmap pixmap) {
+	item.setPixmap(pixmap);
+	adjustView();
+}
+
+
+void ImageView::setImage(const QImage & i) {
+	im_data.clear();
+	if (i.isNull()) {
+		item.setPixmap(QPixmap());
+		return;
+	}
+	QBuffer b(&im_data); b.open(QIODevice::ReadWrite);
+	i.save(&b, "png");
+	b.close();
+	item.setPixmap(QPixmap::fromImage(i));
+	adjustView();
+}
+
+
+void ImageView::setImage(const QByteArray & i) {
+	im_data = i;
+	if (i.isEmpty()) {
+		item.setPixmap(QPixmap());
+		return;
+	}
+	item.setPixmap(QPixmap::fromImage(QImage::fromData(i)));
+	adjustView();
+
+}
+
+
+void ImageView::clear() {
+	im_data.clear();
+	item.setPixmap(QPixmap());
+}
+
+
+void ImageView::mouseDoubleClickEvent(QMouseEvent * e) {
+	autofit();
+}
+
+
+void ImageView::mousePressEvent(QMouseEvent * e) {
+	QGraphicsView::mousePressEvent(e);
+	emit clicked(mapToScene(e->pos()), e->buttons());
+}
+
+
+void ImageView::mouseMoveEvent(QMouseEvent * e) {
+	//if (e->buttons().testFlag(Qt::RightButton) && !autofit_ && isInteractive()) return;;
+	QGraphicsView::mouseMoveEvent(e);
+}
+
+
+void ImageView::wheelEvent(QWheelEvent * e) {
+	if (!e->modifiers().testFlag(Qt::ControlModifier) || !isInteractive()) return;
+	double scl = 1. + e->delta() / 500.;
+	//autofit_ = false;
+	//scale(scl, scl);
+}
+
+
+bool ImageView::eventFilter(QObject * o, QEvent * e) {
+	QMouseEvent * me = (QMouseEvent *)e;
+	switch (e->type()) {
+	case QEvent::Resize:
+		adjustView();
+		break;
+	case QEvent::MouseButtonPress:
+		prev_pos = me->pos();
+		break;
+	case QEvent::MouseMove:
+		if (!me->buttons().testFlag(Qt::RightButton) || autofit_ || !isInteractive()) break;
+		{
+		double scl = 1. / qSqrt(transform().determinant());
+		QPointF dp = QPointF(me->pos() - prev_pos) * scl;
+		//qDebug() << dp;
+		//translate(0.00001, 0);
+		prev_pos = me->pos();
+		}
+		break;
+	default: break;
+	}
+	return QGraphicsView::eventFilter(o, e);
+}
+
+
+void ImageView::adjustView() {
+	if (!autofit_) return;
+	setSceneRect(item.boundingRect());
+	fitInView(&item, Qt::KeepAspectRatio);
+	centerOn(&item);
+}
+
+
+void ImageView::autofit() {
+	autofit_ = true;
+	adjustView();
+}