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package pad.prac1;
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import java.util.Observable;
public class Line extends Observable
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{
private String line;
private int cursorPosition;
private int writeMode;
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private Console console;
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public Line(Console cons)
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{
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console = cons;
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line = "";
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writeMode = EditableBufferedReader.INSERT;
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cursorPosition = 1;
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addObserver(console);
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}
public int length()
{
return line.length();
}
public int getCursorPosition()
{
return cursorPosition;
}
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public void toggleMode()
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{
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writeMode = 1 - writeMode;
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}
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private void sendCommand(int type, int value)
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{
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setChanged();
notifyObservers(new Command(type,value));
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}
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private void sendCommand(int type)
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{
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setChanged();
notifyObservers(new Command(type));
}
private void insertCharAt(char c, int pos)
{
if(pos == 0)
{
String s = "";
s += c;
line = s + line;
}
else if(pos == line.length())
{
line += c;
}
else
{
String s = "";
s += c;
line = line.substring(0, pos).concat(s).concat(line.substring(pos,line.length()));
}
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}
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private void removeCharAt(int pos)
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{
if(pos >= 0)
{
if(pos == 0)
{
line = line.substring(1);
}
else if(pos == line.length()-1)
{
line = line.substring(0, line.length()-1);
}
else
{
line = line.substring(0, pos).concat(line.substring(pos+1,line.length()));
}
}
}
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public void addChar(char c)
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{
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if(c == EditableBufferedReader.RETURN_KEY)
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{
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insertCharAt((char)EditableBufferedReader.LINE_FEED,cursorPosition-1);
sendCommand(Command.INSERT_CHAR,EditableBufferedReader.LINE_FEED);
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sendCommand(Command.INSERT_CHAR,EditableBufferedReader.RETURN_KEY);
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cursorPosition++;
return;
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}
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switch(writeMode)
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{
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case EditableBufferedReader.INSERT:
sendCommand(Command.INSERT_CHAR,(int)c);
insertCharAt(c, cursorPosition-1);
cursorPosition++;
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break;
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case EditableBufferedReader.OVERWRITE:
if(cursorPosition != line.length()+1)
{
removeCharAt(cursorPosition-1);
sendCommand(Command.DELETE_CHAR);
}
sendCommand(Command.INSERT_CHAR,(int)c);
insertCharAt(c, cursorPosition-1);
cursorPosition++;
break;
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}
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}
public void delChar(int mode)
{
switch(mode)
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{
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case EditableBufferedReader.DEL_BACKWARD:
if(cursorPosition != 1)
{
sendCommand(Command.MOVE_CURSOR,cursorPosition-1);
sendCommand(Command.DELETE_CHAR);
removeCharAt(cursorPosition-2);
cursorPosition--;
}
break;
case EditableBufferedReader.DEL_FORWARD:
if(cursorPosition != (line.length()+1))
{
removeCharAt(cursorPosition-1);
sendCommand(Command.DELETE_CHAR,1);
}
break;
}
}
public void setCursorTo(int pos)
{
if((pos <= line.length()+1) && (pos >= 1) && (pos != cursorPosition))
{
sendCommand(Command.MOVE_CURSOR,pos);
cursorPosition = pos;
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}
}
public String toString()
{
return line;
}
}
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