File indexing completed on 2025-01-19 04:23:30

 /*
     Copyright (C) 2007 by Robert Knight <robertknight@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; if not, write to the Free Software
     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
     02110-1301  USA.
 */
 
 // Own
 #include "ScreenWindow.h"
 
 // Qt
 #include <QtDebug>
 
 // Konsole
 #include "Screen.h"
 
 using namespace Konsole;
 
 ScreenWindow::ScreenWindow(QObject* parent)
     : QObject(parent)
     , _windowBuffer(0)
     , _windowBufferSize(0)
     , _bufferNeedsUpdate(true)
     , _windowLines(1)
     , _currentLine(0)
     , _trackOutput(true)
     , _scrollCount(0)
 {
 }
 ScreenWindow::~ScreenWindow()
 {
     delete[] _windowBuffer;
 }
 void ScreenWindow::setScreen(Screen* screen)
 {
     Q_ASSERT( screen );
 
     _screen = screen;
 }
 
 Screen* ScreenWindow::screen() const
 {
     return _screen;
 }
 
 Character* ScreenWindow::getImage()
 {
     // reallocate internal buffer if the window size has changed
     int size = windowLines() * windowColumns();
     if (_windowBuffer == 0 || _windowBufferSize != size)
     {
         delete[] _windowBuffer;
         _windowBufferSize = size;
         _windowBuffer = new Character[size];
         _bufferNeedsUpdate = true;
     }
 
      if (!_bufferNeedsUpdate)
         return _windowBuffer;
 
     _screen->getImage(_windowBuffer,size,
                       currentLine(),endWindowLine());
 
     // this window may look beyond the end of the screen, in which
     // case there will be an unused area which needs to be filled
     // with blank characters
     fillUnusedArea();
 
     _bufferNeedsUpdate = false;
     return _windowBuffer;
 }
 
 void ScreenWindow::fillUnusedArea()
 {
     int screenEndLine = _screen->getHistLines() + _screen->getLines() - 1;
     int windowEndLine = currentLine() + windowLines() - 1;
 
     int unusedLines = windowEndLine - screenEndLine;
     int charsToFill = unusedLines * windowColumns();
 
     Screen::fillWithDefaultChar(_windowBuffer + _windowBufferSize - charsToFill,charsToFill);
 }
 
 // return the index of the line at the end of this window, or if this window
 // goes beyond the end of the screen, the index of the line at the end
 // of the screen.
 //
 // when passing a line number to a Screen method, the line number should
 // never be more than endWindowLine()
 //
 int ScreenWindow::endWindowLine() const
 {
     return qMin(currentLine() + windowLines() - 1,
                 lineCount() - 1);
 }
 QVector<LineProperty> ScreenWindow::getLineProperties()
 {
     QVector<LineProperty> result = _screen->getLineProperties(currentLine(),endWindowLine());
 
     if (result.count() != windowLines())
         result.resize(windowLines());
 
     return result;
 }
 
 QString ScreenWindow::selectedText( bool preserveLineBreaks ) const
 {
     return _screen->selectedText( preserveLineBreaks );
 }
 
 void ScreenWindow::getSelectionStart( int& column , int& line )
 {
     _screen->getSelectionStart(column,line);
     line -= currentLine();
 }
 void ScreenWindow::getSelectionEnd( int& column , int& line )
 {
     _screen->getSelectionEnd(column,line);
     line -= currentLine();
 }
 void ScreenWindow::setSelectionStart( int column , int line , bool columnMode )
 {
     _screen->setSelectionStart( column , qMin(line + currentLine(),endWindowLine())  , columnMode);
 
     _bufferNeedsUpdate = true;
     Q_EMIT selectionChanged();
 }
 
 void ScreenWindow::setSelectionEnd( int column , int line )
 {
     _screen->setSelectionEnd( column , qMin(line + currentLine(),endWindowLine()) );
 
     _bufferNeedsUpdate = true;
     Q_EMIT selectionChanged();
 }
 
 bool ScreenWindow::isSelected( int column , int line )
 {
     return _screen->isSelected( column , qMin(line + currentLine(),endWindowLine()) );
 }
 
 void ScreenWindow::clearSelection()
 {
     _screen->clearSelection();
 
     Q_EMIT selectionChanged();
 }
 
 void ScreenWindow::setWindowLines(int lines)
 {
     Q_ASSERT(lines > 0);
     _windowLines = lines;
 }
 int ScreenWindow::windowLines() const
 {
     return _windowLines;
 }
 
 int ScreenWindow::windowColumns() const
 {
     return _screen->getColumns();
 }
 
 int ScreenWindow::lineCount() const
 {
     return _screen->getHistLines() + _screen->getLines();
 }
 
 int ScreenWindow::columnCount() const
 {
     return _screen->getColumns();
 }
 
 QPoint ScreenWindow::cursorPosition() const
 {
     QPoint position;
 
     position.setX( _screen->getCursorX() );
     position.setY( _screen->getCursorY() );
 
     return position;
 }
 
 int ScreenWindow::currentLine() const
 {
     return qBound(0,_currentLine,lineCount()-windowLines());
 }
 
 void ScreenWindow::scrollBy( RelativeScrollMode mode , int amount )
 {
     if ( mode == ScrollLines )
     {
         scrollTo( currentLine() + amount );
     }
     else if ( mode == ScrollPages )
     {
         scrollTo( currentLine() + amount * ( windowLines() / 2 ) );
     }
 }
 
 bool ScreenWindow::atEndOfOutput() const
 {
     return currentLine() == (lineCount()-windowLines());
 }
 
 void ScreenWindow::scrollTo( int line )
 {
     int maxCurrentLineNumber = lineCount() - windowLines();
     line = qBound(0,line,maxCurrentLineNumber);
 
     const int delta = line - _currentLine;
     _currentLine = line;
 
     // keep track of number of lines scrolled by,
     // this can be reset by calling resetScrollCount()
     _scrollCount += delta;
 
     _bufferNeedsUpdate = true;
 
     Q_EMIT scrolled(_currentLine);
 }
 
 void ScreenWindow::setTrackOutput(bool trackOutput)
 {
     _trackOutput = trackOutput;
 }
 
 bool ScreenWindow::trackOutput() const
 {
     return _trackOutput;
 }
 
 int ScreenWindow::scrollCount() const
 {
     return _scrollCount;
 }
 
 void ScreenWindow::resetScrollCount()
 {
     _scrollCount = 0;
 }
 
 QRect ScreenWindow::scrollRegion() const
 {
     bool equalToScreenSize = windowLines() == _screen->getLines();
 
     if ( atEndOfOutput() && equalToScreenSize )
         return _screen->lastScrolledRegion();
     else
         return QRect(0,0,windowColumns(),windowLines());
 }
 
 void ScreenWindow::selectAll()
 {
     _screen->selectAll();
 
     _bufferNeedsUpdate = true;
     Q_EMIT selectionChanged();
 }
 
 void ScreenWindow::notifyOutputChanged()
 {
     // move window to the bottom of the screen and update scroll count
     // if this window is currently tracking the bottom of the screen
     if ( _trackOutput )
     {
         _scrollCount -= _screen->scrolledLines();
         _currentLine = qMax(0,_screen->getHistLines() - (windowLines()-_screen->getLines()));
     }
     else
     {
         // if the history is not unlimited then it may
         // have run out of space and dropped the oldest
         // lines of output - in this case the screen
         // window's current line number will need to
         // be adjusted - otherwise the output will scroll
         _currentLine = qMax(0,_currentLine -
                               _screen->droppedLines());
 
         // ensure that the screen window's current position does
         // not go beyond the bottom of the screen
         _currentLine = qMin( _currentLine , _screen->getHistLines() );
     }
 
     _bufferNeedsUpdate = true;
 
     Q_EMIT outputChanged();
 }
 
 //#include "ScreenWindow.moc"