119 lines
2.8 KiB
C++
119 lines
2.8 KiB
C++
#include "imagescrollarea.h"
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#include <QMouseEvent>
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#include <QScrollBar>
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#include <QKeyEvent>
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#include <QDebug>
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ImageScrollArea::ImageScrollArea(QWidget *parent) : QScrollArea(parent),
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m_scale(-1)
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{
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m_label = new QLabel(this);
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setWidget(m_label);
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}
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void ImageScrollArea::setImage(const QPixmap &img)
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{
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m_pixmap = img;
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QPixmap pix;
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if(m_scale < 0)
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pix = img.scaled(size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
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else
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pix = img.scaled(img.size() * m_scale, Qt::KeepAspectRatio, Qt::SmoothTransformation);
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m_label->setPixmap(pix);
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m_label->resize(pix.size());
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horizontalScrollBar()->setValue(horizontalScrollBar()->maximum() / 2);
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verticalScrollBar()->setValue(verticalScrollBar()->maximum() / 2);
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}
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void ImageScrollArea::setScale(float scale)
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{
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if(scale > 4 || (scale < 0.2 && scale > 0))
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return;
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m_scale = scale;
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QSize newSize = m_scale < 0 ? size() : m_pixmap.size()*scale;
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m_label->setPixmap(m_pixmap.scaled(newSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
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m_label->resize(newSize);
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}
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void ImageScrollArea::zoomIn()
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{
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if(m_scale < 0)
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m_scale = (float)size().width()/m_pixmap.size().width();
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setScale(m_scale + 0.1);
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}
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void ImageScrollArea::zoomOut()
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{
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if(m_scale < 0)
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m_scale = (float)size().width()/m_pixmap.size().width();
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setScale(m_scale - 0.1);
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}
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void ImageScrollArea::bestFit()
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{
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setScale(-1);
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}
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void ImageScrollArea::oneToOne()
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{
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setScale(1);
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}
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void ImageScrollArea::keyPressEvent(QKeyEvent *event)
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{
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event->ignore();
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}
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void ImageScrollArea::keyReleaseEvent(QKeyEvent *event)
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{
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event->ignore();
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}
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void ImageScrollArea::mouseMoveEvent(QMouseEvent *event)
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{
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QPoint delta = m_lastPos - event->pos();
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horizontalScrollBar()->setValue(horizontalScrollBar()->value() + delta.x());
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verticalScrollBar()->setValue(verticalScrollBar()->value() + delta.y());
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m_lastPos = event->pos();
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}
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void ImageScrollArea::mousePressEvent(QMouseEvent *event)
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{
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m_lastPos = event->pos();
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}
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void ImageScrollArea::resizeEvent(QResizeEvent *event)
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{
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if(m_scale < 0)
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{
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m_label->setPixmap(m_pixmap.scaled(event->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation));
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m_label->resize(event->size());
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}
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QScrollArea::resizeEvent(event);
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}
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void ImageScrollArea::wheelEvent(QWheelEvent *event)
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{
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if(m_scale < 0)
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m_scale = (float)size().width()/m_pixmap.size().width();
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QPointF top(horizontalScrollBar()->value(), verticalScrollBar()->value());
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QPointF mousePos = (top + event->posF()) / m_scale;
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QPoint delta = event->angleDelta();
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if(delta.y() > 0)
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setScale(m_scale + 0.1);
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else
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setScale(m_scale - 0.1);
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mousePos *= m_scale;
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top = mousePos - event->posF();
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horizontalScrollBar()->setValue(top.x());
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verticalScrollBar()->setValue(top.y());
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}
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