109 lines
2.3 KiB
C++
109 lines
2.3 KiB
C++
#include "LogWidget.h"
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#include "utils/Logger.h"
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#include <QFile>
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#include <QStackedLayout>
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#include <QTextStream>
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#include <QThread>
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namespace Calamares
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{
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LogThread::LogThread( QObject* parent )
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: QThread( parent )
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{
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}
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LogThread::~LogThread()
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{
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quit();
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requestInterruption();
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wait();
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}
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void
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LogThread::run()
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{
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const auto filePath = Logger::logFile();
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qint64 lastPosition = 0;
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while ( !QThread::currentThread()->isInterruptionRequested() )
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{
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QFile file( filePath );
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qint64 fileSize = file.size();
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// Check whether the file size has changed since last time
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// we read the file.
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if ( lastPosition != fileSize && file.open( QFile::ReadOnly | QFile::Text ) )
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{
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// Start reading at the position we ended up last time we read the file.
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file.seek( lastPosition );
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QTextStream in( &file );
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auto chunk = in.readAll();
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qint64 newPosition = in.pos();
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lastPosition = newPosition;
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Q_EMIT onLogChunk( chunk );
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}
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QThread::msleep( 100 );
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}
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}
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LogWidget::LogWidget( QWidget* parent )
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: QWidget( parent )
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, m_text( new QPlainTextEdit )
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, m_log_thread( this )
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{
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auto layout = new QStackedLayout( this );
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setLayout( layout );
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m_text->setReadOnly( true );
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QFont monospaceFont( "monospace" );
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monospaceFont.setStyleHint( QFont::Monospace );
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m_text->setFont( monospaceFont );
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layout->addWidget( m_text );
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connect( &m_log_thread, &LogThread::onLogChunk, this, &LogWidget::handleLogChunk );
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m_log_thread.setPriority( QThread::LowestPriority );
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m_log_thread.start();
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}
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void
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LogWidget::handleLogChunk( const QString& logChunk )
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{
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// Scroll to the end of the new chunk, only if we were at the end (tailing
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// the log); scrolling up will break the tail-to-end behavior.
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const bool isAtEnd = m_text->textCursor().atEnd();
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m_text->appendPlainText( logChunk );
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if ( isAtEnd )
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{
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m_text->moveCursor( QTextCursor::End );
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}
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m_text->ensureCursorVisible();
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}
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void
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LogWidget::start()
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{
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if ( !m_log_thread.isRunning() )
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{
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m_text->clear();
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m_log_thread.start();
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}
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}
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void
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LogWidget::stop()
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{
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m_log_thread.requestInterruption();
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}
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} // namespace Calamares
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