/*
 * This file is part of lanterna (https://github.com/mabe02/lanterna).
 * 
 * lanterna is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * Copyright (C) 2010-2020 Martin Berglund
 */
package com.googlecode.lanterna.terminal;

import com.googlecode.lanterna.TerminalSize;

This class is a simple implementation of Terminal.ResizeListener which will keep track of the size of the terminal
and let you know if the terminal has been resized since you last checked. This can be useful to avoid threading 
problems with the resize callback when your application is using a main event loop.
Author:
martin/**
 * This class is a simple implementation of Terminal.ResizeListener which will keep track of the size of the terminal
 * and let you know if the terminal has been resized since you last checked. This can be useful to avoid threading 
 * problems with the resize callback when your application is using a main event loop.
 * 
 * @author martin
 */
@SuppressWarnings("WeakerAccess")
public class SimpleTerminalResizeListener implements TerminalResizeListener {

    boolean wasResized;
    TerminalSize lastKnownSize;

    
Creates a new SimpleTerminalResizeListener
Params:
initialSize – Before any resize event, this listener doesn't know the size of the terminal. By supplying a
value here, you control what getLastKnownSize() will return if invoked before any resize events has reached us./**
     * Creates a new SimpleTerminalResizeListener
     * @param initialSize Before any resize event, this listener doesn't know the size of the terminal. By supplying a
     * value here, you control what getLastKnownSize() will return if invoked before any resize events has reached us.
     */
    public SimpleTerminalResizeListener(TerminalSize initialSize) {
        this.wasResized = false;
        this.lastKnownSize = initialSize;
    }
    
    
Checks if the terminal was resized since the last time this method was called. If this is the first time calling
this method, the result is going to be based on if the terminal has been resized since this listener was attached
to the Terminal.
Returns:
true if the terminal was resized, false otherwise/**
     * Checks if the terminal was resized since the last time this method was called. If this is the first time calling
     * this method, the result is going to be based on if the terminal has been resized since this listener was attached
     * to the Terminal.
     * 
     * @return true if the terminal was resized, false otherwise
     */
    public synchronized boolean isTerminalResized() {
        if(wasResized) {
            wasResized = false;
            return true;
        }
        else {
            return false;
        }
    }

    
Returns the last known size the Terminal is supposed to have.
Returns:
Size of the terminal, as of the last resize update/**
     * Returns the last known size the Terminal is supposed to have.
     * 
     * @return Size of the terminal, as of the last resize update
     */
    public TerminalSize getLastKnownSize() {
        return lastKnownSize;
    }
    
    @Override
    public synchronized void onResized(Terminal terminal, TerminalSize newSize) {
        this.wasResized = true;
        this.lastKnownSize = newSize;
    }
    
}