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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 <QAbstractTextDocumentLayout>
#include <QTextDocument>
#include <QTextBlock>
#include "BlockHighlight.h"
#include "TextEditor.h"
#include "TextBlockData.h"
//_______________________________________________________________________
BlockHighlight::BlockHighlight( TextEditor* parent ):
QObject( parent ),
Counter( "BlockHighlight" ),
parent_( parent )
{ Debug::Throw( "BlockHighlight::BlockHighlight.\n" ); }
//______________________________________________________________________
void BlockHighlight::clear()
{
if( cleared_ ) return;
// loop over all blocks
for( auto&& block = parent_->document()->begin(); block.isValid(); block = block.next() )
{
if( parent_->textCursor().block() == block && isEnabled() ) continue;
TextBlockData* data( static_cast<TextBlockData*>( block.userData() ) );
if( data && data->hasFlag( TextBlock::CurrentBlock ) )
{
// reset flag
data->setFlag( TextBlock::CurrentBlock, false );
// mark contents dirty to trigger document update
_updateEditors();
}
}
cleared_ = true;
}
//______________________________________________________________________
void BlockHighlight::highlight()
{
if( !isEnabled() ) return;
clear();
timer_.start(50, this );
}
//______________________________________________________________________
void BlockHighlight::timerEvent( QTimerEvent* event )
{
if( event->timerId() != timer_.timerId() ) return QObject::timerEvent( event );
timer_.stop();
_highlight();
}
//______________________________________________________________________
void BlockHighlight::_highlight()
{
if( !isEnabled() ) return;
// retrieve current block
QTextBlock block( parent_->textCursor().block() );
TextBlockData* data = static_cast<TextBlockData*>( block.userData() );
if( !data )
{
data = new TextBlockData;
block.setUserData( data );
} else if( data->hasFlag( TextBlock::CurrentBlock ) ) return;
// need to redo the clear a second time, forced,
// in case the previous draw action occured after the previous clear.
cleared_ = false;
clear();
// mark block as current
data->setFlag( TextBlock::CurrentBlock, true );
// mark contents dirty to trigger document update
_updateEditors();
cleared_ = false;
}
//______________________________________________________________________
void BlockHighlight::_updateEditors()
{
Base::KeySet<TextEditor> editors( parent_ );
editors.insert( parent_ );
for( const auto& editor:editors ) editor->viewport()->update();
}
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