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30d336cc KL |
1 | /** |
2 | * Jexer - Java Text User Interface | |
3 | * | |
4 | * License: LGPLv3 or later | |
5 | * | |
6 | * This module is licensed under the GNU Lesser General Public License | |
7 | * Version 3. Please see the file "COPYING" in this directory for more | |
8 | * information about the GNU Lesser General Public License Version 3. | |
9 | * | |
10 | * Copyright (C) 2015 Kevin Lamonte | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU Lesser General Public License | |
14 | * as published by the Free Software Foundation; either version 3 of | |
15 | * the License, or (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, but | |
18 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
20 | * General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU Lesser General Public | |
23 | * License along with this program; if not, see | |
24 | * http://www.gnu.org/licenses/, or write to the Free Software | |
25 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
26 | * 02110-1301 USA | |
27 | * | |
28 | * @author Kevin Lamonte [kevin.lamonte@gmail.com] | |
29 | * @version 1 | |
30 | */ | |
31 | package jexer; | |
32 | ||
33 | import jexer.bits.CellAttributes; | |
34 | import jexer.bits.Color; | |
35 | import jexer.bits.GraphicsChars; | |
36 | import jexer.bits.MnemonicString; | |
37 | import jexer.event.TKeypressEvent; | |
38 | import jexer.event.TMouseEvent; | |
39 | import static jexer.TKeypress.*; | |
40 | ||
41 | /** | |
42 | * TButton implements a simple button. To make the button do something, pass | |
43 | * a TAction class to its constructor. | |
44 | * | |
45 | * @see TAction#DO() | |
46 | */ | |
47 | public final class TButton extends TWidget { | |
48 | ||
49 | /** | |
50 | * The shortcut and button text. | |
51 | */ | |
52 | private MnemonicString mnemonic; | |
53 | ||
92554d64 KL |
54 | /** |
55 | * Get the mnemonic string for this button. | |
56 | * | |
57 | * @return mnemonic string | |
58 | */ | |
59 | public final MnemonicString getMnemonic() { | |
60 | return mnemonic; | |
61 | } | |
62 | ||
30d336cc KL |
63 | /** |
64 | * Remember mouse state. | |
65 | */ | |
66 | private TMouseEvent mouse; | |
67 | ||
68 | /** | |
69 | * True when the button is being pressed and held down. | |
70 | */ | |
71 | private boolean inButtonPress = false; | |
72 | ||
73 | /** | |
74 | * The action to perform when the button is clicked. | |
75 | */ | |
76 | private TAction action; | |
77 | ||
78 | /** | |
79 | * Private constructor. | |
80 | * | |
81 | * @param parent parent widget | |
82 | * @param text label on the button | |
83 | * @param x column relative to parent | |
84 | * @param y row relative to parent | |
85 | */ | |
86 | private TButton(final TWidget parent, final String text, | |
87 | final int x, final int y) { | |
88 | ||
89 | // Set parent and window | |
90 | super(parent); | |
91 | ||
92 | mnemonic = new MnemonicString(text); | |
93 | ||
94 | setX(x); | |
95 | setY(y); | |
96 | setHeight(2); | |
97 | setWidth(mnemonic.getRawLabel().length() + 3); | |
98 | } | |
99 | ||
100 | /** | |
101 | * Public constructor. | |
102 | * | |
103 | * @param parent parent widget | |
104 | * @param text label on the button | |
105 | * @param x column relative to parent | |
106 | * @param y row relative to parent | |
107 | * @param action to call when button is pressed | |
108 | */ | |
109 | public TButton(final TWidget parent, final String text, | |
110 | final int x, final int y, final TAction action) { | |
111 | ||
112 | this(parent, text, x, y); | |
113 | this.action = action; | |
114 | } | |
115 | ||
116 | /** | |
117 | * Returns true if the mouse is currently on the button. | |
118 | * | |
119 | * @return if true the mouse is currently on the button | |
120 | */ | |
121 | private boolean mouseOnButton() { | |
122 | int rightEdge = getWidth() - 1; | |
123 | if (inButtonPress) { | |
124 | rightEdge++; | |
125 | } | |
126 | if ((mouse != null) | |
127 | && (mouse.getY() == 0) | |
128 | && (mouse.getX() >= 0) | |
129 | && (mouse.getX() < rightEdge) | |
130 | ) { | |
131 | return true; | |
132 | } | |
133 | return false; | |
134 | } | |
135 | ||
136 | /** | |
137 | * Draw a button with a shadow. | |
138 | */ | |
139 | @Override | |
140 | public void draw() { | |
141 | CellAttributes buttonColor; | |
142 | CellAttributes menuMnemonicColor; | |
143 | CellAttributes shadowColor = new CellAttributes(); | |
144 | shadowColor.setTo(getWindow().getBackground()); | |
145 | shadowColor.setForeColor(Color.BLACK); | |
146 | shadowColor.setBold(false); | |
147 | ||
7c870d89 | 148 | if (!isEnabled()) { |
30d336cc KL |
149 | buttonColor = getTheme().getColor("tbutton.disabled"); |
150 | menuMnemonicColor = getTheme().getColor("tbutton.disabled"); | |
7c870d89 | 151 | } else if (isAbsoluteActive()) { |
30d336cc KL |
152 | buttonColor = getTheme().getColor("tbutton.active"); |
153 | menuMnemonicColor = getTheme().getColor("tbutton.mnemonic.highlighted"); | |
154 | } else { | |
155 | buttonColor = getTheme().getColor("tbutton.inactive"); | |
156 | menuMnemonicColor = getTheme().getColor("tbutton.mnemonic"); | |
157 | } | |
158 | ||
159 | if (inButtonPress) { | |
160 | getScreen().putCharXY(1, 0, ' ', buttonColor); | |
161 | getScreen().putStrXY(2, 0, mnemonic.getRawLabel(), buttonColor); | |
162 | getScreen().putCharXY(getWidth() - 1, 0, ' ', buttonColor); | |
163 | } else { | |
164 | getScreen().putCharXY(0, 0, ' ', buttonColor); | |
165 | getScreen().putStrXY(1, 0, mnemonic.getRawLabel(), buttonColor); | |
166 | getScreen().putCharXY(getWidth() - 2, 0, ' ', buttonColor); | |
167 | ||
168 | getScreen().putCharXY(getWidth() - 1, 0, | |
169 | GraphicsChars.CP437[0xDC], shadowColor); | |
170 | getScreen().hLineXY(1, 1, getWidth() - 1, | |
171 | GraphicsChars.CP437[0xDF], shadowColor); | |
172 | } | |
173 | if (mnemonic.getShortcutIdx() >= 0) { | |
174 | if (inButtonPress) { | |
175 | getScreen().putCharXY(2 + mnemonic.getShortcutIdx(), 0, | |
176 | mnemonic.getShortcut(), menuMnemonicColor); | |
177 | } else { | |
178 | getScreen().putCharXY(1 + mnemonic.getShortcutIdx(), 0, | |
179 | mnemonic.getShortcut(), menuMnemonicColor); | |
180 | } | |
181 | ||
182 | } | |
183 | } | |
184 | ||
185 | /** | |
186 | * Handle mouse button presses. | |
187 | * | |
188 | * @param mouse mouse button event | |
189 | */ | |
190 | @Override | |
191 | public void onMouseDown(final TMouseEvent mouse) { | |
192 | this.mouse = mouse; | |
193 | ||
7c870d89 | 194 | if ((mouseOnButton()) && (mouse.isMouse1())) { |
30d336cc KL |
195 | // Begin button press |
196 | inButtonPress = true; | |
197 | } | |
198 | } | |
199 | ||
200 | /** | |
201 | * Handle mouse button releases. | |
202 | * | |
203 | * @param mouse mouse button release event | |
204 | */ | |
205 | @Override | |
206 | public void onMouseUp(final TMouseEvent mouse) { | |
207 | this.mouse = mouse; | |
208 | ||
7c870d89 | 209 | if (inButtonPress && mouse.isMouse1()) { |
30d336cc KL |
210 | inButtonPress = false; |
211 | // Dispatch the event | |
212 | if (action != null) { | |
213 | action.DO(); | |
214 | } | |
215 | } | |
216 | ||
217 | } | |
218 | ||
219 | /** | |
220 | * Handle mouse movements. | |
221 | * | |
222 | * @param mouse mouse motion event | |
223 | */ | |
224 | @Override | |
225 | public void onMouseMotion(final TMouseEvent mouse) { | |
226 | this.mouse = mouse; | |
227 | ||
228 | if (!mouseOnButton()) { | |
229 | inButtonPress = false; | |
230 | } | |
231 | } | |
232 | ||
233 | /** | |
234 | * Handle keystrokes. | |
235 | * | |
236 | * @param keypress keystroke event | |
237 | */ | |
238 | @Override | |
239 | public void onKeypress(final TKeypressEvent keypress) { | |
240 | if (keypress.equals(kbEnter) | |
241 | || keypress.equals(kbSpace) | |
242 | ) { | |
243 | // Dispatch | |
244 | if (action != null) { | |
245 | action.DO(); | |
246 | } | |
247 | return; | |
248 | } | |
249 | ||
250 | // Pass to parent for the things we don't care about. | |
251 | super.onKeypress(keypress); | |
252 | } | |
253 | ||
254 | } |