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/* This file is part of the KDE libraries
Copyright (C) 2000,2002 Carsten Pfeiffer <pfeiffer@kde.org>
2000 Malte Starostik <malte@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "textcreator.h"
#include <QFile>
#include <QFontDatabase>
#include <QPixmap>
#include <QImage>
#include <QPainter>
#include <QPalette>
#include <QTextCodec>
// TODO Fix or remove kencodingprober code
// #include <kencodingprober.h>
extern "C"
{
Q_DECL_EXPORT ThumbCreator *new_creator()
{
return new TextCreator;
}
}
TextCreator::TextCreator()
: m_data(0),
m_dataSize(0)
{
}
TextCreator::~TextCreator()
{
delete [] m_data;
}
static QTextCodec *codecFromContent(const char *data, int dataSize)
{
#if 0 // ### Use this when KEncodingProber does not return junk encoding for UTF-8 data)
KEncodingProber prober;
prober.feed(data, dataSize);
return QTextCodec::codecForName(prober.encoding());
#else
QByteArray ba = QByteArray::fromRawData(data, dataSize);
// try to detect UTF text, fall back to locale default (which is usually UTF-8)
return QTextCodec::codecForUtfText(ba, QTextCodec::codecForLocale());
#endif
}
bool TextCreator::create(const QString &path, int width, int height, QImage &img)
{
bool ok = false;
// determine some sizes...
// example: width: 60, height: 64
QSize pixmapSize( width, height );
if (height * 3 > width * 4)
pixmapSize.setHeight( width * 4 / 3 );
else
pixmapSize.setWidth( height * 3 / 4 );
if ( pixmapSize != m_pixmap.size() )
m_pixmap = QPixmap( pixmapSize );
// one pixel for the rectangle, the rest. whitespace
int xborder = 1 + pixmapSize.width()/16; // minimum x-border
int yborder = 1 + pixmapSize.height()/16; // minimum y-border
// this font is supposed to look good at small sizes
QFont font = QFontDatabase::systemFont(QFontDatabase::SmallestReadableFont);
font.setPixelSize( qMax(7, qMin( 10, ( pixmapSize.height() - 2 * yborder ) / 16 ) ) );
QFontMetrics fm( font );
// calculate a better border so that the text is centered
int canvasWidth = pixmapSize.width() - 2*xborder;
int canvasHeight = pixmapSize.height() - 2*yborder;
int numLines = (int) ( canvasHeight / fm.height() );
// assumes an average line length of <= 120 chars
const int bytesToRead = 120 * numLines;
// create text-preview
QFile file( path );
if ( file.open( QIODevice::ReadOnly ))
{
if ( !m_data || m_dataSize < bytesToRead + 1 )
{
delete [] m_data;
m_data = new char[bytesToRead+1];
m_dataSize = bytesToRead + 1;
}
int read = file.read( m_data, bytesToRead );
if ( read > 0 )
{
ok = true;
m_data[read] = '\0';
QString text = codecFromContent( m_data, read )->toUnicode( m_data, read ).trimmed();
// FIXME: maybe strip whitespace and read more?
// If the text contains tabs or consecutive spaces, it is probably
// formatted using white space. Use a fixed pitch font in this case.
QStringList textLines = text.split( '\n' );
foreach ( const QString &line, textLines ) {
QString trimmedLine = line.trimmed();
if ( trimmedLine.contains( '\t' ) || trimmedLine.contains( " " ) ) {
font.setFamily( QFontDatabase::systemFont(QFontDatabase::FixedFont).family());
break;
}
}
#if 0
QPalette palette;
QColor bgColor = palette.color( QPalette::Base );
QColor fgColor = palette.color( QPalette::Text );
if ( qGray( bgColor.rgb() ) > qGray( fgColor.rgb() ) ) {
bgColor = bgColor.darker( 103 );
} else {
bgColor = bgColor.lighter( 103 );
}
#else
QColor bgColor = QColor ( 245, 245, 245 ); // light-grey background
QColor fgColor = Qt::black;
#endif
m_pixmap.fill( bgColor );
QRect rect;
QPainter painter( &m_pixmap );
painter.setFont( font );
painter.setPen( fgColor );
QTextOption textOption( Qt::AlignTop | Qt::AlignLeft );
textOption.setTabStop( 8 * painter.fontMetrics().width( ' ' ) );
textOption.setWrapMode( QTextOption::WrapAtWordBoundaryOrAnywhere );
painter.drawText( QRect( xborder, yborder, canvasWidth, canvasHeight ), text, textOption );
painter.end();
img = m_pixmap.toImage();
}
file.close();
}
return ok;
}
ThumbCreator::Flags TextCreator::flags() const
{
return (Flags)(DrawFrame | BlendIcon);
}
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