增加图片预览查看模块

imageviewwindow/graphicspixmap.cpp

@@ -0,0 +1,59 @@
+#include "graphicspixmap.h"
+
+#include <QGraphicsSceneMouseEvent>
+#include <QPainter>
+#include <QCursor>
+#include <QDebug>
+
+GraphicsPixmap::GraphicsPixmap() : QGraphicsObject()
+{
+	setCacheMode(DeviceCoordinateCache);
+}
+
+void GraphicsPixmap::mousePressEvent(QGraphicsSceneMouseEvent *event)
+{
+	QGraphicsObject::mousePressEvent(event);
+	if (event->button() == Qt::LeftButton)
+	{
+		emit clicked();
+	}
+}
+
+void GraphicsPixmap::setItemOffset(QPointF ponit)
+{
+	prepareGeometryChange();
+	offset = ponit;
+	update();
+}
+
+QPointF GraphicsPixmap::itemoffset()
+{
+	return offset;
+}
+
+void GraphicsPixmap::setPixmap(const QPixmap& pixmap)
+{
+	pixSize = pixmap.size();
+	pix = pixmap;
+}
+
+void GraphicsPixmap::setPixmapSize(QSize size)
+{
+	pixSize = size;
+}
+
+QSize GraphicsPixmap::pixsize()
+{
+	return pixSize;
+}
+
+QRectF GraphicsPixmap::boundingRect() const
+{
+	return QRectF(offset, pix.size() / pix.devicePixelRatio());
+}
+
+void GraphicsPixmap::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
+{
+	painter->setRenderHint(QPainter::SmoothPixmapTransform, true);
+	painter->drawPixmap(offset, pix.scaled(pixSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
+}