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1 | /** |
2 | * Jexer - Java Text User Interface | |
3 | * | |
4 | * Version: $Id$ | |
5 | * | |
6 | * Author: Kevin Lamonte, <a href="mailto:kevin.lamonte@gmail.com">kevin.lamonte@gmail.com</a> | |
7 | * | |
8 | * License: LGPLv3 or later | |
9 | * | |
10 | * Copyright: This module is licensed under the GNU Lesser General | |
11 | * Public License Version 3. Please see the file "COPYING" in this | |
12 | * directory for more information about the GNU Lesser General Public | |
13 | * License Version 3. | |
14 | * | |
15 | * Copyright (C) 2015 Kevin Lamonte | |
16 | * | |
17 | * This program is free software; you can redistribute it and/or | |
18 | * modify it under the terms of the GNU Lesser General Public License | |
19 | * as published by the Free Software Foundation; either version 3 of | |
20 | * the License, or (at your option) any later version. | |
21 | * | |
22 | * This program is distributed in the hope that it will be useful, but | |
23 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
25 | * General Public License for more details. | |
26 | * | |
27 | * You should have received a copy of the GNU Lesser General Public | |
28 | * License along with this program; if not, see | |
29 | * http://www.gnu.org/licenses/, or write to the Free Software | |
30 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
31 | * 02110-1301 USA | |
32 | */ | |
33 | package jexer.backend; | |
34 | ||
35 | import jexer.event.TInputEvent; | |
36 | import jexer.io.Screen; | |
37 | import jexer.session.SessionInfo; | |
38 | ||
39 | /** | |
40 | * This abstract class provides a screen, keyboard, and mouse to | |
41 | * TApplication. It also exposes session information as gleaned from lower | |
42 | * levels of the communication stack. | |
43 | */ | |
44 | public abstract class Backend { | |
45 | ||
46 | /** | |
47 | * The session information | |
48 | */ | |
49 | public SessionInfo session; | |
50 | ||
51 | /** | |
52 | * The screen to draw on | |
53 | */ | |
54 | public Screen screen; | |
55 | ||
56 | /** | |
57 | * Subclasses must provide an implementation that syncs the logical | |
58 | * screen to the physical device. | |
59 | */ | |
60 | abstract public void flushScreen(); | |
61 | ||
62 | /** | |
63 | * Subclasses must provide an implementation to get keyboard, mouse, and | |
64 | * screen resize events. | |
65 | * | |
66 | * @param timeout maximum amount of time to wait for an event | |
67 | * @return events received, or an empty list if the timeout was reached | |
68 | */ | |
69 | abstract public TInputEvent [] getEvents(int timeout); | |
70 | ||
71 | /** | |
72 | * Subclasses must provide an implementation that closes sockets, | |
73 | * restores console, etc. | |
74 | */ | |
75 | abstract public void shutdown(); | |
76 | ||
77 | } | |
78 |