| 1 | /* |
| 2 | * This file is part of lanterna (http://code.google.com/p/lanterna/). |
| 3 | * |
| 4 | * lanterna is free software: you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU Lesser General Public License as published by |
| 6 | * the Free Software Foundation, either version 3 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public License |
| 15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | * |
| 17 | * Copyright (C) 2010-2015 Martin |
| 18 | */ |
| 19 | package com.googlecode.lanterna.terminal; |
| 20 | |
| 21 | import com.googlecode.lanterna.TerminalSize; |
| 22 | import com.googlecode.lanterna.graphics.TextGraphics; |
| 23 | |
| 24 | import java.io.IOException; |
| 25 | import java.util.ArrayList; |
| 26 | import java.util.List; |
| 27 | |
| 28 | /** |
| 29 | * Containing a some very fundamental functionality that should be common (and usable) to all terminal implementations. |
| 30 | * All the Terminal implementers within Lanterna extends from this class. |
| 31 | * |
| 32 | * @author Martin |
| 33 | */ |
| 34 | public abstract class AbstractTerminal implements Terminal { |
| 35 | |
| 36 | private final List<ResizeListener> resizeListeners; |
| 37 | private TerminalSize lastKnownSize; |
| 38 | |
| 39 | protected AbstractTerminal() { |
| 40 | this.resizeListeners = new ArrayList<ResizeListener>(); |
| 41 | this.lastKnownSize = null; |
| 42 | } |
| 43 | |
| 44 | @Override |
| 45 | public void addResizeListener(ResizeListener listener) { |
| 46 | if (listener != null) { |
| 47 | resizeListeners.add(listener); |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | @Override |
| 52 | public void removeResizeListener(ResizeListener listener) { |
| 53 | if (listener != null) { |
| 54 | resizeListeners.remove(listener); |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * Call this method when the terminal has been resized or the initial size of the terminal has been discovered. It |
| 60 | * will trigger all resize listeners, but only if the size has changed from before. |
| 61 | * |
| 62 | * @param columns Number of columns in the new size |
| 63 | * @param rows Number of rows in the new size |
| 64 | */ |
| 65 | protected synchronized void onResized(int columns, int rows) { |
| 66 | TerminalSize newSize = new TerminalSize(columns, rows); |
| 67 | if (lastKnownSize == null || !lastKnownSize.equals(newSize)) { |
| 68 | lastKnownSize = newSize; |
| 69 | for (ResizeListener resizeListener : resizeListeners) { |
| 70 | resizeListener.onResized(this, lastKnownSize); |
| 71 | } |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | @Override |
| 76 | public TextGraphics newTextGraphics() throws IOException { |
| 77 | return new TerminalTextGraphics(this); |
| 78 | } |
| 79 | } |