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/******************************************************************************
*
* Copyright (C) 2002 Hugo PEREIRA <mailto: hugo.pereira@free.fr>
*
* This 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 software 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. If not, see <http://www.gnu.org/licenses/>.
*
*******************************************************************************/
#include "TextEditor.h"
#include "Debug.h"
#include "LineNumberDisplay.h"
#include "XmlOptions.h"
#include <QAbstractTextDocumentLayout>
#include <QPainter>
#include <QScrollBar>
#include <QTextDocument>
#include <QTextBlock>
#include <QTextLayout>
//____________________________________________________________________________
LineNumberDisplay::LineNumberDisplay(TextEditor* editor):
QObject( editor ),
Counter( "LineNumberDisplay" ),
editor_( editor )
{
Debug::Throw( "LineNumberDisplay::LineNumberDisplay.\n" );
connect( &editor_->wrapModeAction(), SIGNAL(toggled(bool)), SLOT(needUpdate()) );
// document connections
connect( editor_->document(), SIGNAL(blockCountChanged(int)), SLOT(_blockCountChanged()) );
connect( editor_->document(), SIGNAL(contentsChanged()), SLOT(_contentsChanged()) );
}
//__________________________________________
void LineNumberDisplay::synchronize( LineNumberDisplay* display )
{
Debug::Throw( "LineNumberDisplay::synchronize.\n" );
// copy members
lineNumberData_ = display->lineNumberData_;
needsUpdate_ = display->needsUpdate_;
width_ = display->width_;
// re-initialize connections
connect( editor_->document(), SIGNAL(blockCountChanged(int)), SLOT(_blockCountChanged()) );
connect( editor_->document(), SIGNAL(contentsChanged()), SLOT(_contentsChanged()) );
}
//__________________________________________
bool LineNumberDisplay::updateWidth( int count )
{
Debug::Throw( "LineNumberDisplay::updateWidth.\n" );
int new_width( editor_->fontMetrics().width( QString::number( count ) ) + 14 );
if( width() == new_width ) return false;
width_ = new_width;
Debug::Throw() << "LineNumberDisplay::updateWidth - count: " << count << " new_width: " << new_width << endl;
return true;
}
//__________________________________________
void LineNumberDisplay::clear()
{
Debug::Throw( "LineNumberDisplay::clear.\n" );
lineNumberData_.clear();
needsUpdate_ = true;
}
//__________________________________________
void LineNumberDisplay::paint( QPainter& painter )
{
// update line number data if needed
if( needsUpdate_ ) _updateLineNumberData();
needsUpdate_ = false;
// font metric and offset
auto metric( editor_->fontMetrics() );
// calculate dimensions
int yOffset = editor_->verticalScrollBar()->value() - editor_->frameWidth();
int height( editor_->contentsRect().height() );
// translate
height += yOffset;
// get begin and end cursor positions
int firstIndex = editor_->cursorForPosition( QPoint( 0, 0 ) ).position();
int lastIndex = editor_->cursorForPosition( QPoint( 0, editor_->height() ) ).position();
// loop over data
QTextBlock block( editor_->document()->begin() );
int id( 0 );
for( auto& data:lineNumberData_ )
{
// skip if block is not (yet) in window
if( data.cursor() < firstIndex ) continue;
// stop if block is outside (below) window
if( data.cursor() > lastIndex ) break;
// check validity
if( !data.isValid() ) _updateLineNumberData( block, id, data );
// check position
if( data.isValid() && data.position() > height ) continue;
QString numtext( QString::number( data.lineNumber() ) );
painter.drawText(
0, data.position(), width_-8,
metric.lineSpacing(),
Qt::AlignRight | Qt::AlignTop,
numtext );
}
}
//________________________________________________________
void LineNumberDisplay::_contentsChanged()
{
// if text is wrapped, line number data needs update at next update
/* note: this could be further optimized if one retrieve the position at which the contents changed occured */
if( editor_->lineWrapMode() != TextEditor::NoWrap )
{ needUpdate(); }
}
//________________________________________________________
void LineNumberDisplay::_blockCountChanged()
{
// nothing to be done if wrap mode is not NoWrap, because
// it is handled in the _contentsChanged slot.
if( editor_->lineWrapMode() == TextEditor::NoWrap )
{ needUpdate(); }
}
//________________________________________________________
void LineNumberDisplay::_updateLineNumberData()
{
lineNumberData_.clear();
// get document
int id( 0 );
int block_count( 1 );
QTextDocument &document( *editor_->document() );
for( auto&& block = document.begin(); block.isValid(); block = block.next(), id++ )
{
// insert new data
lineNumberData_ << LineNumberData( id, block_count, block.position() );
// update block count
block_count += editor_->blockCount( block );
}
return;
}
//________________________________________________________
void LineNumberDisplay::_updateLineNumberData( QTextBlock& block, int& id, LineNumberDisplay::LineNumberData& data ) const
{
Q_ASSERT( !data.isValid() );
// find block matching data id
if( data.id() < id ) { for( ; data.id() < id && block.isValid(); block = block.previous(), id-- ) {} }
else if( data.id() > id ) { for( ; data.id() > id && block.isValid(); block = block.next(), id++ ) {} }
Q_ASSERT( block.isValid() );
data.setPosition( (int)block.layout()->position().y() );
}
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