qsvgwidget.cpp

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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qsvgwidget.h"
 
#include <qsvgrenderer.h>
 
#include "qstyleoption.h"
#include "qpainter.h"
#include <QtWidgets/private/qwidget_p.h>
 
QT_BEGIN_NAMESPACE
 
class QSvgWidgetPrivate : public QWidgetPrivate
{
    Q_DECLARE_PUBLIC(QSvgWidget)
public:
    QSvgRenderer *renderer;
};
 
// Event listener for ShowEvent/HideEvent on QSvgWidget (which can't just
// reimplement event() or showEvent()/hideEvent() or eventFilter() in case
// a subclass doesn't call the base class in those methods)
// ### Qt 7: remove the event filter; move this logic into showEvent/hideEvent; add event() override
class QSvgWidgetListener : public QObject
{
public:
    using QObject::QObject;
 
protected:
    bool eventFilter(QObject *obj, QEvent *event) override
    {
        if (event->type() == QEvent::Show)
            renderer()->setAnimationEnabled(true);
        else if (event->type() == QEvent::Hide)
            renderer()->setAnimationEnabled(false);
        return QObject::eventFilter(obj, event);
    }
 
private:
    QSvgRenderer *renderer()
    {
        return static_cast<QSvgWidgetPrivate *>(QObjectPrivate::get(parent()))->renderer;
    }
};
 
QSvgWidget::QSvgWidget(QWidget *parent)
    : QWidget(*new QSvgWidgetPrivate, parent, {})
{
    d_func()->renderer = new QSvgRenderer(this);
    QObject::connect(d_func()->renderer, SIGNAL(repaintNeeded()),
                     this, SLOT(update()));
    installEventFilter(new QSvgWidgetListener(this));
}
 
QSvgWidget::QSvgWidget(const QString &file, QWidget *parent)
    : QSvgWidget(parent)
{
    d_func()->renderer->load(file);
}
 
QSvgWidget::~QSvgWidget()
{
 
}
 
QSvgRenderer * QSvgWidget::renderer() const
{
    Q_D(const QSvgWidget);
    return d->renderer;
}
 
 
QSize QSvgWidget::sizeHint() const
{
    Q_D(const QSvgWidget);
    if (d->renderer->isValid())
        return d->renderer->defaultSize();
    else
        return QSize(128, 64);
}
 
QtSvg::Options QSvgWidget::options() const
{
    Q_D(const QSvgWidget);
    return d->renderer->options();
}
 
void QSvgWidget::setOptions(QtSvg::Options options)
{
    Q_D(QSvgWidget);
    d->renderer->setOptions(options);
}
 
void QSvgWidget::paintEvent(QPaintEvent *)
{
    Q_D(QSvgWidget);
    QStyleOption opt;
    opt.initFrom(this);
    QPainter p(this);
    style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
    d->renderer->render(&p);
}
 
void QSvgWidget::load(const QString &file)
{
    Q_D(const QSvgWidget);
    d->renderer->load(file);
    if (!isVisible())
        d->renderer->setAnimationEnabled(false);
}
 
void QSvgWidget::load(const QByteArray &contents)
{
    Q_D(const QSvgWidget);
    d->renderer->load(contents);
    if (!isVisible())
        d->renderer->setAnimationEnabled(false);
}
 
QT_END_NAMESPACE