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Zoom support

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This commit is contained in:
Dušan Poizl
2016-07-30 16:08:06 +02:00
parent b44ff27f54
commit a679efa11a
3 changed files with 89 additions and 5 deletions
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imagescrollarea.cpp
+74 -4
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@@ -2,8 +2,10 @@
#include <QMouseEvent>
#include <QScrollBar>
#include <QKeyEvent>
#include <QDebug>
ImageScrollArea::ImageScrollArea(QWidget *parent) : QScrollArea(parent)
ImageScrollArea::ImageScrollArea(QWidget *parent) : QScrollArea(parent),
m_scale(-1)
{
m_label = new QLabel(this);
setWidget(m_label);
@@ -12,9 +14,54 @@ ImageScrollArea::ImageScrollArea(QWidget *parent) : QScrollArea(parent)
void ImageScrollArea::setImage(const QPixmap &img)
{
m_pixmap = img;
QPixmap pix = img.scaled(size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
QPixmap pix;
if(m_scale < 0)
pix = img.scaled(size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
else
pix = img.scaled(img.size() * m_scale, Qt::KeepAspectRatio, Qt::SmoothTransformation);
m_label->setPixmap(pix);
m_label->resize(pix.size());
horizontalScrollBar()->setValue(horizontalScrollBar()->maximum() / 2);
verticalScrollBar()->setValue(verticalScrollBar()->maximum() / 2);
}
void ImageScrollArea::setScale(float scale)
{
if(scale > 4 || (scale < 0.2 && scale > 0))
return;
m_scale = scale;
QSize newSize = m_scale < 0 ? size() : m_pixmap.size()*scale;
m_label->setPixmap(m_pixmap.scaled(newSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
m_label->resize(newSize);
}
void ImageScrollArea::zoomIn()
{
if(m_scale < 0)
m_scale = (float)size().width()/m_pixmap.size().width();
setScale(m_scale + 0.1);
}
void ImageScrollArea::zoomOut()
{
if(m_scale < 0)
m_scale = (float)size().width()/m_pixmap.size().width();
setScale(m_scale - 0.1);
}
void ImageScrollArea::bestFit()
{
setScale(-1);
}
void ImageScrollArea::oneToOne()
{
setScale(1);
}
void ImageScrollArea::keyPressEvent(QKeyEvent *event)
@@ -42,7 +89,30 @@ void ImageScrollArea::mousePressEvent(QMouseEvent *event)
void ImageScrollArea::resizeEvent(QResizeEvent *event)
{
m_label->setPixmap(m_pixmap.scaled(event->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation));
m_label->resize(event->size());
if(m_scale < 0)
{
m_label->setPixmap(m_pixmap.scaled(event->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation));
m_label->resize(event->size());
}
QScrollArea::resizeEvent(event);
}
void ImageScrollArea::wheelEvent(QWheelEvent *event)
{
if(m_scale < 0)
m_scale = (float)size().width()/m_pixmap.size().width();
QPointF top(horizontalScrollBar()->value(), verticalScrollBar()->value());
QPointF mousePos = (top + event->posF()) / m_scale;
QPoint delta = event->angleDelta();
if(delta.y() > 0)
setScale(m_scale + 0.1);
else
setScale(m_scale - 0.1);
mousePos *= m_scale;
top = mousePos - event->posF();
horizontalScrollBar()->setValue(top.x());
verticalScrollBar()->setValue(top.y());
}