143 lines
4.1 KiB
C++
143 lines
4.1 KiB
C++
/*
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* Cantata
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*
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* Copyright (c) 2011-2020 Craig Drummond <craig.p.drummond@gmail.com>
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*
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* ----
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "textbrowser.h"
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#include <QImage>
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#include <QScrollBar>
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#include <QEvent>
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#include <QStyle>
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#include <QTimer>
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TextBrowser::TextBrowser(QWidget *p)
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: QTextBrowser(p)
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, timer(nullptr)
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, lastImageSize(0)
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, fullWidthImg(false)
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, haveImg(false)
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{
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}
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// QTextEdit/QTextBrowser seems to do FastTransformation when scaling images, and this looks bad.
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QVariant TextBrowser::loadResource(int type, const QUrl &name)
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{
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if (QTextDocument::ImageResource==type) {
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if ((name.scheme().isEmpty() || QLatin1String("file")==name.scheme())) {
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QImage img;
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img.load(name.path());
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if (!img.isNull()) {
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haveImg=true;
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return img.scaled(imageSize(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
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}
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} else if (QLatin1String("data")==name.scheme()) {
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QByteArray encoded=name.toEncoded();
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static const QString constStart("data:image/png;base64,");
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encoded=QByteArray::fromBase64(encoded.mid(constStart.length()));
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QImage img;
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img.loadFromData(encoded);
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if (!img.isNull()) {
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haveImg=true;
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return img.scaled(imageSize(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
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}
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}
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}
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return QTextBrowser::loadResource(type, name);
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}
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void TextBrowser::setFullWidthImage(bool s)
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{
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if (s!=fullWidthImg) {
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fullWidthImg=s;
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verticalScrollBar()->removeEventFilter(this);
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if (fullWidthImg) {
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verticalScrollBar()->installEventFilter(this);
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}
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if (haveImg) {
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setHtml(toHtml());
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}
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}
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}
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void TextBrowser::setPal(const QPalette &pal)
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{
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setPalette(pal);
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verticalScrollBar()->setPalette(pal);
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horizontalScrollBar()->setPalette(pal);
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}
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void TextBrowser::resizeEvent(QResizeEvent *e)
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{
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handleSizeChange();
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QTextBrowser::resizeEvent(e);
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}
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bool TextBrowser::eventFilter(QObject *obj, QEvent *ev)
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{
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if (obj==verticalScrollBar() && (QEvent::Show==ev->type() || QEvent::Hide==ev->type())) {
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handleSizeChange();
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}
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return QTextBrowser::eventFilter(obj, ev);
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}
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void TextBrowser::refreshHtml()
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{
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setHtml(toHtml());
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}
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void TextBrowser::handleSizeChange()
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{
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if (haveImg) {
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int imgSize=imageSize().width();
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if (imgSize!=lastImageSize) {
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if (timer) {
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timer->stop();
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} else {
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timer=new QTimer(this);
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timer->setSingleShot(true);
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connect(timer, SIGNAL(timeout()), SLOT(refreshHtml()));
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}
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lastImageSize=imgSize;
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timer->start();
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}
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}
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}
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QSize TextBrowser::imageSize() const
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{
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QSize sz;
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int sbarSpacing = style()->pixelMetric(QStyle::PM_ScrollView_ScrollBarSpacing);
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if (sbarSpacing<0) {
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sz=size()-QSize(4, 0);
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} else {
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QScrollBar *sb=verticalScrollBar();
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int sbarWidth=sb && sb->isVisible() ? 0 : style()->pixelMetric(QStyle::PM_ScrollBarExtent);
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sz=size()-QSize(4 + sbarSpacing + sbarWidth, 0);
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}
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if (fullWidthImg || sz.width()<=picSize().width()) {
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return sz.width()<32 || sz.height()<32 ? QSize(32, 32) : sz;
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}
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return picSize();
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}
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#include "moc_textbrowser.cpp"
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