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daa4106c | 1 | /* |
df8de03f KL |
2 | * Jexer - Java Text User Interface |
3 | * | |
e16dda65 | 4 | * The MIT License (MIT) |
df8de03f | 5 | * |
a69ed767 | 6 | * Copyright (C) 2019 Kevin Lamonte |
df8de03f | 7 | * |
e16dda65 KL |
8 | * Permission is hereby granted, free of charge, to any person obtaining a |
9 | * copy of this software and associated documentation files (the "Software"), | |
10 | * to deal in the Software without restriction, including without limitation | |
11 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
12 | * and/or sell copies of the Software, and to permit persons to whom the | |
13 | * Software is furnished to do so, subject to the following conditions: | |
df8de03f | 14 | * |
e16dda65 KL |
15 | * The above copyright notice and this permission notice shall be included in |
16 | * all copies or substantial portions of the Software. | |
df8de03f | 17 | * |
e16dda65 KL |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
21 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
23 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
24 | * DEALINGS IN THE SOFTWARE. | |
7b5261bc KL |
25 | * |
26 | * @author Kevin Lamonte [kevin.lamonte@gmail.com] | |
27 | * @version 1 | |
df8de03f | 28 | */ |
42873e30 | 29 | package jexer.backend; |
df8de03f | 30 | |
42873e30 | 31 | import java.util.List; |
df8de03f | 32 | |
42873e30 | 33 | import jexer.event.TInputEvent; |
abb84744 KL |
34 | import jexer.event.TCommandEvent; |
35 | import static jexer.TCommand.*; | |
df8de03f | 36 | |
42873e30 KL |
37 | /** |
38 | * This abstract class provides a screen, keyboard, and mouse to | |
39 | * TApplication. It also exposes session information as gleaned from lower | |
40 | * levels of the communication stack. | |
41 | */ | |
42 | public abstract class GenericBackend implements Backend { | |
df8de03f | 43 | |
d36057df KL |
44 | // ------------------------------------------------------------------------ |
45 | // Variables -------------------------------------------------------------- | |
46 | // ------------------------------------------------------------------------ | |
47 | ||
df8de03f | 48 | /** |
42873e30 | 49 | * The session information. |
df8de03f | 50 | */ |
42873e30 | 51 | protected SessionInfo sessionInfo; |
df8de03f | 52 | |
d36057df KL |
53 | /** |
54 | * The screen to draw on. | |
55 | */ | |
56 | protected Screen screen; | |
57 | ||
58 | /** | |
59 | * Input events are processed by this Terminal. | |
60 | */ | |
61 | protected TerminalReader terminal; | |
62 | ||
63 | // ------------------------------------------------------------------------ | |
64 | // Constructors ----------------------------------------------------------- | |
65 | // ------------------------------------------------------------------------ | |
66 | ||
67 | // ------------------------------------------------------------------------ | |
68 | // Backend ---------------------------------------------------------------- | |
69 | // ------------------------------------------------------------------------ | |
70 | ||
df8de03f | 71 | /** |
42873e30 | 72 | * Getter for sessionInfo. |
df8de03f | 73 | * |
42873e30 | 74 | * @return the SessionInfo |
df8de03f | 75 | */ |
42873e30 KL |
76 | public final SessionInfo getSessionInfo() { |
77 | return sessionInfo; | |
df8de03f KL |
78 | } |
79 | ||
df8de03f | 80 | /** |
42873e30 | 81 | * Getter for screen. |
df8de03f | 82 | * |
42873e30 | 83 | * @return the Screen |
df8de03f | 84 | */ |
42873e30 KL |
85 | public final Screen getScreen() { |
86 | return screen; | |
df8de03f KL |
87 | } |
88 | ||
89 | /** | |
88a99379 | 90 | * Sync the logical screen to the physical device. |
df8de03f | 91 | */ |
88a99379 KL |
92 | public void flushScreen() { |
93 | screen.flushPhysical(); | |
94 | } | |
95 | ||
96 | /** | |
d36057df KL |
97 | * Check if there are events in the queue. |
98 | * | |
99 | * @return if true, getEvents() has something to return to the application | |
88a99379 | 100 | */ |
d36057df KL |
101 | public boolean hasEvents() { |
102 | return terminal.hasEvents(); | |
103 | } | |
df8de03f KL |
104 | |
105 | /** | |
88a99379 | 106 | * Get keyboard, mouse, and screen resize events. |
c8496dac | 107 | * |
42873e30 | 108 | * @param queue list to append new events to |
df8de03f | 109 | */ |
88a99379 KL |
110 | public void getEvents(final List<TInputEvent> queue) { |
111 | if (terminal.hasEvents()) { | |
112 | terminal.getEvents(queue); | |
abb84744 KL |
113 | |
114 | // This default backend assumes a single user, and if that user | |
115 | // becomes disconnected we should terminate the application. | |
116 | if (queue.size() > 0) { | |
117 | TInputEvent event = queue.get(queue.size() - 1); | |
118 | if (event instanceof TCommandEvent) { | |
119 | TCommandEvent command = (TCommandEvent) event; | |
120 | if (command.equals(cmBackendDisconnect)) { | |
121 | queue.add(new TCommandEvent(cmAbort)); | |
122 | } | |
123 | } | |
124 | } | |
88a99379 KL |
125 | } |
126 | } | |
df8de03f KL |
127 | |
128 | /** | |
88a99379 | 129 | * Close the I/O, restore the console, etc. |
df8de03f | 130 | */ |
88a99379 KL |
131 | public void shutdown() { |
132 | terminal.closeTerminal(); | |
133 | } | |
c8496dac KL |
134 | |
135 | /** | |
88a99379 | 136 | * Set the window title. |
42873e30 KL |
137 | * |
138 | * @param title the new title | |
c8496dac | 139 | */ |
88a99379 KL |
140 | public void setTitle(final String title) { |
141 | screen.setTitle(title); | |
142 | } | |
143 | ||
144 | /** | |
145 | * Set listener to a different Object. | |
146 | * | |
147 | * @param listener the new listening object that run() wakes up on new | |
148 | * input | |
149 | */ | |
150 | public void setListener(final Object listener) { | |
151 | terminal.setListener(listener); | |
152 | } | |
c8496dac | 153 | |
e23ea538 KL |
154 | /** |
155 | * Reload backend options from System properties. | |
156 | */ | |
157 | public void reloadOptions() { | |
158 | terminal.reloadOptions(); | |
159 | } | |
160 | ||
df8de03f | 161 | } |