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a3b510ab NR |
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 | ||
23 | /** | |
24 | * This class is a simple implementation of Terminal.ResizeListener which will keep track of the size of the terminal | |
25 | * and let you know if the terminal has been resized since you last checked. This can be useful to avoid threading | |
26 | * problems with the resize callback when your application is using a main event loop. | |
27 | * | |
28 | * @author martin | |
29 | */ | |
30 | @SuppressWarnings("WeakerAccess") | |
31 | public class SimpleTerminalResizeListener implements ResizeListener { | |
32 | ||
33 | boolean wasResized; | |
34 | TerminalSize lastKnownSize; | |
35 | ||
36 | /** | |
37 | * Creates a new SimpleTerminalResizeListener | |
38 | * @param initialSize Before any resize event, this listener doesn't know the size of the terminal. By supplying a | |
39 | * value here, you control what getLastKnownSize() will return if invoked before any resize events has reached us. | |
40 | */ | |
41 | public SimpleTerminalResizeListener(TerminalSize initialSize) { | |
42 | this.wasResized = false; | |
43 | this.lastKnownSize = initialSize; | |
44 | } | |
45 | ||
46 | /** | |
47 | * Checks if the terminal was resized since the last time this method was called. If this is the first time calling | |
48 | * this method, the result is going to be based on if the terminal has been resized since this listener was attached | |
49 | * to the Terminal. | |
50 | * | |
51 | * @return true if the terminal was resized, false otherwise | |
52 | */ | |
53 | public synchronized boolean isTerminalResized() { | |
54 | if(wasResized) { | |
55 | wasResized = false; | |
56 | return true; | |
57 | } | |
58 | else { | |
59 | return false; | |
60 | } | |
61 | } | |
62 | ||
63 | /** | |
64 | * Returns the last known size the Terminal is supposed to have. | |
65 | * | |
66 | * @return Size of the terminal, as of the last resize update | |
67 | */ | |
68 | public TerminalSize getLastKnownSize() { | |
69 | return lastKnownSize; | |
70 | } | |
71 | ||
72 | @Override | |
73 | public synchronized void onResized(Terminal terminal, TerminalSize newSize) { | |
74 | this.wasResized = true; | |
75 | this.lastKnownSize = newSize; | |
76 | } | |
77 | ||
78 | } |