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/*
* Cantata
*
* Copyright (c) 2011-2022 Craig Drummond <craig.p.drummond@gmail.com>
*
* ----
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "textbrowser.h"
#include <QEvent>
#include <QFile>
#include <QImage>
#include <QScrollBar>
#include <QStyle>
#include <QTimer>
TextBrowser::TextBrowser(QWidget* p)
: QTextBrowser(p), timer(nullptr), lastImageSize(0), fullWidthImg(false), haveImg(false)
{
}
// QTextEdit/QTextBrowser seems to do FastTransformation when scaling images, and this looks bad.
QVariant TextBrowser::loadResource(int type, const QUrl& name)
{
if (QTextDocument::ImageResource == type) {
QImage img;
if ((name.scheme().isEmpty() || QLatin1String("file") == name.scheme())) {
img.load(name.path());
if (img.isNull()) {
// Failed to load, perhaps extension is wrong? If so try to guess from plain data without hint from file name.
QFile file(name.path());
if (file.open(QIODevice::ReadOnly)) {
QByteArray data = file.readAll();
img.loadFromData(data);
}
}
}
else if (QLatin1String("data") == name.scheme()) {
QByteArray encoded = name.toEncoded();
static const QString constStart("data:image/png;base64,");
encoded = QByteArray::fromBase64(encoded.mid(constStart.length()));
img.loadFromData(encoded);
}
if (!img.isNull()) {
haveImg = true;
return img.scaled(imageSize(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
}
}
return QTextBrowser::loadResource(type, name);
}
void TextBrowser::setFullWidthImage(bool s)
{
if (s != fullWidthImg) {
fullWidthImg = s;
verticalScrollBar()->removeEventFilter(this);
if (fullWidthImg) {
verticalScrollBar()->installEventFilter(this);
}
if (haveImg) {
setHtml(toHtml());
}
}
}
void TextBrowser::setPal(const QPalette& pal)
{
setPalette(pal);
verticalScrollBar()->setPalette(pal);
horizontalScrollBar()->setPalette(pal);
}
void TextBrowser::resizeEvent(QResizeEvent* e)
{
handleSizeChange();
QTextBrowser::resizeEvent(e);
}
bool TextBrowser::eventFilter(QObject* obj, QEvent* ev)
{
if (obj == verticalScrollBar() && (QEvent::Show == ev->type() || QEvent::Hide == ev->type())) {
handleSizeChange();
}
return QTextBrowser::eventFilter(obj, ev);
}
void TextBrowser::refreshHtml()
{
setHtml(toHtml());
}
void TextBrowser::handleSizeChange()
{
if (haveImg) {
int imgSize = imageSize().width();
if (imgSize != lastImageSize) {
if (timer) {
timer->stop();
}
else {
timer = new QTimer(this);
timer->setSingleShot(true);
connect(timer, SIGNAL(timeout()), SLOT(refreshHtml()));
}
lastImageSize = imgSize;
timer->start();
}
}
}
QSize TextBrowser::imageSize() const
{
QSize sz;
int sbarSpacing = style()->pixelMetric(QStyle::PM_ScrollView_ScrollBarSpacing);
if (sbarSpacing < 0) {
sz = size() - QSize(4, 0);
}
else {
QScrollBar* sb = verticalScrollBar();
int sbarWidth = sb && sb->isVisible() ? 0 : style()->pixelMetric(QStyle::PM_ScrollBarExtent);
sz = size() - QSize(4 + sbarSpacing + sbarWidth, 0);
}
if (fullWidthImg || sz.width() <= picSize().width()) {
return sz.width() < 32 || sz.height() < 32 ? QSize(32, 32) : sz;
}
return picSize();
}
#include "moc_textbrowser.cpp"
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