/**
* Calling this method will put the underlying terminal in private mode, clear the screen, move
* the cursor and refresh.
*
* @throws LanternaException
*/
public void startScreen() {
if (hasBeenActivated) return;
hasBeenActivated = true;
terminal.enterPrivateMode();
terminal.clearScreen();
terminal.moveCursor(cursorPosition.getColumn(), cursorPosition.getRow());
refresh();
}
/**
* Call this method to make changes done through {@code putCharacter(...)}, {@code putString(...)}
* visible on the terminal. The screen will calculate the changes that are required and send the
* necessary characters and control sequences to make it so.
*/
public void refresh() {
if (!hasBeenActivated) return;
synchronized (mutex) {
// If any resize operations are in the queue, execute them
resizeScreenIfNeeded();
Map<TerminalPosition, ScreenCharacter> updateMap =
new TreeMap<TerminalPosition, ScreenCharacter>(new ScreenPointComparator());
for (int y = 0; y < terminalSize.getRows(); y++) {
for (int x = 0; x < terminalSize.getColumns(); x++) {
ScreenCharacter c = backbuffer[y][x];
if (!c.equals(visibleScreen[y][x]) || wholeScreenInvalid) {
visibleScreen[y][x] =
c; // Remember, ScreenCharacter is immutable, we don't need to worry about it being
// modified
updateMap.put(new TerminalPosition(x, y), c);
}
}
}
Writer terminalWriter = new Writer();
terminalWriter.reset();
TerminalPosition previousPoint = null;
for (TerminalPosition nextUpdate : updateMap.keySet()) {
if (previousPoint == null
|| previousPoint.getRow() != nextUpdate.getRow()
|| previousPoint.getColumn() + 1 != nextUpdate.getColumn()) {
terminalWriter.setCursorPosition(nextUpdate.getColumn(), nextUpdate.getRow());
}
terminalWriter.writeCharacter(updateMap.get(nextUpdate));
previousPoint = nextUpdate;
}
terminalWriter.setCursorPosition(
getCursorPosition().getColumn(), getCursorPosition().getRow());
wholeScreenInvalid = false;
}
terminal.flush();
}
public int compare(TerminalPosition o1, TerminalPosition o2) {
if (o1.getRow() == o2.getRow())
if (o1.getColumn() == o2.getColumn()) return 0;
else return new Integer(o1.getColumn()).compareTo(o2.getColumn());
else return new Integer(o1.getRow()).compareTo(o2.getRow());
}