126 lines
3.6 KiB
C++
126 lines
3.6 KiB
C++
/*
|
|
* Cantata
|
|
*
|
|
* Copyright (c) 2011-2018 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 <QImage>
|
|
#include <QScrollBar>
|
|
#include <QEvent>
|
|
#include <QStyle>
|
|
|
|
TextBrowser::TextBrowser(QWidget *p)
|
|
: QTextBrowser(p)
|
|
, lastImageSize(0)
|
|
, scaleImg(false)
|
|
, haveImg(false)
|
|
{
|
|
origZoomValue=font().pointSize();
|
|
}
|
|
|
|
// 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) {
|
|
if ((name.scheme().isEmpty() || QLatin1String("file")==name.scheme())) {
|
|
QImage img;
|
|
img.load(name.path());
|
|
if (!img.isNull()) {
|
|
haveImg=true;
|
|
return img.scaled(imageSize(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
|
|
}
|
|
} 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()));
|
|
QImage img;
|
|
img.loadFromData(encoded);
|
|
if (!img.isNull()) {
|
|
haveImg=true;
|
|
return img.scaled(imageSize(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
|
|
}
|
|
}
|
|
}
|
|
return QTextBrowser::loadResource(type, name);
|
|
}
|
|
|
|
void TextBrowser::setScaleImage(bool s)
|
|
{
|
|
if (s!=scaleImg) {
|
|
scaleImg=s;
|
|
verticalScrollBar()->removeEventFilter(this);
|
|
if (scaleImg) {
|
|
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::handleSizeChange()
|
|
{
|
|
if (haveImg && scaleImg) {
|
|
int imgSize=imageSize().width();
|
|
if (imgSize!=lastImageSize) {
|
|
lastImageSize=imgSize;
|
|
setHtml(toHtml());
|
|
}
|
|
}
|
|
}
|
|
|
|
QSize TextBrowser::imageSize() const
|
|
{
|
|
if (!scaleImage()) {
|
|
return picSize();
|
|
}
|
|
|
|
int sbarSpacing = style()->pixelMetric(QStyle::PM_ScrollView_ScrollBarSpacing);
|
|
if (sbarSpacing<0) {
|
|
return size()-QSize(4, 0);
|
|
} else {
|
|
QScrollBar *sb=verticalScrollBar();
|
|
int sbarWidth=sb && sb->isVisible() ? 0 : style()->pixelMetric(QStyle::PM_ScrollBarExtent);
|
|
return size()-QSize(4 + sbarSpacing + sbarWidth, 0);
|
|
}
|
|
}
|