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package pad.prac1;
import java.util.Observable;
import java.util.Observer;
public class Console implements Observer
{
public void moveCursorTo(int pos, int currentPos, int length)
{
if(pos > currentPos)
{
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print(pos - currentPos);
System.out.print((char)EditableBufferedReader.FORWARD);
}
else if(pos < currentPos)
{
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print(currentPos-pos);
System.out.print((char)EditableBufferedReader.BACKWARD);
}
}
private void insertSpace()
{
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print((char)EditableBufferedReader.INS_SPACE);
}
private void delChar()
{
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print((char)EditableBufferedReader.DEL_CHAR);
}
public void addChar(char c, Line line)
{
if(line.getCursorPosition() != line.length()+1)
{
insertSpace();
}
System.out.print(c);
}
public void update(Observable obs, Object arg)
{
Line line = (Line)obs;
Command cmd = (Command)arg;
switch(cmd.getType())
{
case Command.INSERT_CHAR:
addChar((char)cmd.getValue(),line);
break;
case Command.DELETE_CHAR:
delChar();
break;
case Command.MOVE_CURSOR:
moveCursorTo(cmd.getValue(),line.getCursorPosition(),line.length());
break;
}
}
}
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