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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QPainter>
#include <QApplication>
#include "embeddedsvgviewer.h"
EmbeddedSvgViewer::EmbeddedSvgViewer(const QString &filePath)
{
qApp->setStyleSheet(" QSlider:vertical { width: 50px; } \
QSlider::groove:vertical { border: 1px solid black; border-radius: 3px; width: 6px; } \
QSlider::handle:vertical { height: 25px; margin: 0 -22px; image: url(':/files/v-slider-handle.svg'); } \
");
m_renderer = new QSvgRenderer(filePath);
m_imageSize = m_renderer->viewBox().size();
m_viewBoxCenter = (QPointF(m_imageSize.width() / qreal(2.0), m_imageSize.height() / qreal(2.0)));
m_zoomSlider = new QSlider(Qt::Vertical, this);
m_zoomSlider->setMaximum(150);
m_zoomSlider->setMinimum(1);
connect(m_zoomSlider, SIGNAL(valueChanged(int)), this, SLOT(setZoom(int)));
m_zoomSlider->setValue(100);
m_quitButton = new QPushButton("Quit", this);
connect(m_quitButton, SIGNAL(pressed()), QApplication::instance(), SLOT(quit()));
if (m_renderer->animated())
connect(m_renderer, SIGNAL(repaintNeeded()), this, SLOT(update()));
}
void EmbeddedSvgViewer::paintEvent(QPaintEvent *event)
{
Q_UNUSED(event);
QPainter painter(this);
m_renderer->setViewBox(m_viewBox);
m_renderer->render(&painter);
}
void EmbeddedSvgViewer::mouseMoveEvent ( QMouseEvent * event )
{
int incX = int((event->globalPosition().toPoint().x() - m_mousePress.x()) * m_imageScale);
int incY = int((event->globalPosition().toPoint().y() - m_mousePress.y()) * m_imageScale);
QPointF newCenter;
newCenter.setX(m_viewBoxCenterOnMousePress.x() - incX);
newCenter.setY(m_viewBoxCenterOnMousePress.y() - incY);
QRectF newViewBox = getViewBox(newCenter);
// Do a bounded move on the horizontal:
if ( (newViewBox.left() >= m_viewBoxBounds.left()) &&
(newViewBox.right() <= m_viewBoxBounds.right()) )
{
m_viewBoxCenter.setX(newCenter.x());
m_viewBox.setLeft(newViewBox.left());
m_viewBox.setRight(newViewBox.right());
}
// do a bounded move on the vertical:
if ( (newViewBox.top() >= m_viewBoxBounds.top()) &&
(newViewBox.bottom() <= m_viewBoxBounds.bottom()) )
{
m_viewBoxCenter.setY(newCenter.y());
m_viewBox.setTop(newViewBox.top());
m_viewBox.setBottom(newViewBox.bottom());
}
update();
}
void EmbeddedSvgViewer::mousePressEvent ( QMouseEvent * event )
{
m_viewBoxCenterOnMousePress = m_viewBoxCenter;
m_mousePress = event->globalPosition().toPoint();
}
QRectF EmbeddedSvgViewer::getViewBox(QPointF viewBoxCenter)
{
QRectF result;
result.setLeft(viewBoxCenter.x() - (m_viewBoxSize.width() / 2));
result.setTop(viewBoxCenter.y() - (m_viewBoxSize.height() / 2));
result.setRight(viewBoxCenter.x() + (m_viewBoxSize.width() / 2));
result.setBottom(viewBoxCenter.y() + (m_viewBoxSize.height() / 2));
return result;
}
void EmbeddedSvgViewer::updateImageScale()
{
m_imageScale = qMax( (qreal)m_imageSize.width() / (qreal)width(),
(qreal)m_imageSize.height() / (qreal)height())*m_zoomLevel;
m_viewBoxSize.setWidth((qreal)width() * m_imageScale);
m_viewBoxSize.setHeight((qreal)height() * m_imageScale);
}
void EmbeddedSvgViewer::resizeEvent ( QResizeEvent * /* event */ )
{
qreal origZoom = m_zoomLevel;
// Get the new bounds:
m_zoomLevel = 1.0;
updateImageScale();
m_viewBoxBounds = getViewBox(QPointF(m_imageSize.width() / 2.0, m_imageSize.height() / 2.0));
m_zoomLevel = origZoom;
updateImageScale();
m_viewBox = getViewBox(m_viewBoxCenter);
QRect sliderRect;
sliderRect.setLeft(width() - m_zoomSlider->sizeHint().width());
sliderRect.setRight(width());
sliderRect.setTop(height()/4);
sliderRect.setBottom(height() - (height()/4));
m_zoomSlider->setGeometry(sliderRect);
}
void EmbeddedSvgViewer::setZoom(int newZoom)
{
m_zoomLevel = qreal(newZoom) / qreal(100);
updateImageScale();
m_viewBox = getViewBox(m_viewBoxCenter);
update();
}
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