/*
* ScrollLineCount.java
* :tabSize=4:indentSize=4:noTabs=false:
* :folding=explicit:collapseFolds=1:
*
* Copyright (C) 2005 Slava Pestov
*
* 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 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package org.gjt.sp.jedit.textarea;
import org.gjt.sp.jedit.Debug;
import org.gjt.sp.util.Log;
/**
* Maintains the vertical scrollbar.
*/
class ScrollLineCount extends Anchor
{
//{{{ ScrollLineCount constructor
ScrollLineCount(DisplayManager displayManager,
TextArea textArea)
{
super(displayManager,textArea);
} //}}}
@Override
public void changed() {}
//{{{ reset() method
@Override
public void reset()
{
if(Debug.SCROLL_DEBUG)
Log.log(Log.DEBUG,this,"reset()");
int scrollLine = 0;
int physicalLine = getDisplayManager().getFirstVisibleLine();
while(physicalLine != -1)
{
scrollLine += getDisplayManager().getScreenLineCount(physicalLine);
physicalLine = getDisplayManager().getNextVisibleLine(physicalLine);
}
setPhysicalLine(getDisplayManager().getBuffer().getLineCount());
setScrollLine(scrollLine);
} //}}}
@Override
void preContentInserted(int startLine, int numLines)
{
preContentInsertedScrollLines = 0;
int physicalLine = startLine;
if(!getDisplayManager().isLineVisible(physicalLine))
physicalLine = getDisplayManager().getNextVisibleLine(physicalLine);
preContentInsertedScrollLines = getDisplayManager().getScreenLineCount(physicalLine);
}
@Override
void contentInserted(int startLine, int numLines)
{
int scrollLines = 0;
int physicalLine = startLine;
for(int i = 0, n = numLines; i < n; i++, physicalLine++)
{
if(getDisplayManager().isLineVisible(physicalLine))
scrollLines += getDisplayManager().getScreenLineCount(physicalLine);
}
// process next visible line
if(!getDisplayManager().isLineVisible(physicalLine))
physicalLine = getDisplayManager().getNextVisibleLine(physicalLine);
if(physicalLine >= 0)
scrollLines += getDisplayManager().getScreenLineCount(physicalLine);
scrollLines -= preContentInsertedScrollLines;
movePhysicalLine(numLines);
moveScrollLine(scrollLines);
}
@Override
void preContentRemoved(int startLine, int offset, int numLines)
{
int scrollLines = 0;
int physicalLine = startLine;
int numLinesVisible = 0;
for(int i = 0, n = numLines; i < n; i++, physicalLine++)
{
if(getDisplayManager().isLineVisible(physicalLine))
{
scrollLines += getDisplayManager().getScreenLineCount(physicalLine);
numLinesVisible++;
}
}
// process next visible line
if(!getDisplayManager().isLineVisible(physicalLine))
physicalLine = getDisplayManager().getNextVisibleLine(physicalLine);
if(physicalLine >= 0)
{
scrollLines += getDisplayManager().getScreenLineCount(physicalLine);
numLinesVisible++;
}
preContentRemovedScrollLines = scrollLines;
}
@Override
void contentRemoved(int startLine, int startOffset, int numLines)
{
int scrollLines = 0;
int physicalLine = startLine;
if(!getDisplayManager().isLineVisible(physicalLine))
physicalLine = getDisplayManager().getNextVisibleLine(physicalLine);
scrollLines = getDisplayManager().getScreenLineCount(physicalLine);
scrollLines -= preContentRemovedScrollLines;
movePhysicalLine(-numLines);
moveScrollLine(scrollLines);
}
}