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[fanfix.git] / src / jexer / TRadioButton.java
1 /*
2 * Jexer - Java Text User Interface
3 *
4 * The MIT License (MIT)
5 *
6 * Copyright (C) 2019 Kevin Lamonte
7 *
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:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
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.
25 *
26 * @author Kevin Lamonte [kevin.lamonte@gmail.com]
27 * @version 1
28 */
29 package jexer;
30
31 import jexer.bits.CellAttributes;
32 import jexer.bits.GraphicsChars;
33 import jexer.bits.MnemonicString;
34 import jexer.event.TKeypressEvent;
35 import jexer.event.TMouseEvent;
36 import static jexer.TKeypress.*;
37
38 /**
39 * TRadioButton implements a selectable radio button.
40 *
41 * If the user clicks or presses space on this button, it is selected.
42 *
43 * If the user presses escape on this button, it is unselected.
44 */
45 public class TRadioButton extends TWidget {
46
47 // ------------------------------------------------------------------------
48 // Variables --------------------------------------------------------------
49 // ------------------------------------------------------------------------
50
51 /**
52 * RadioButton state, true means selected.
53 */
54 private boolean selected = false;
55
56 /**
57 * The shortcut and radio button label.
58 */
59 private MnemonicString mnemonic;
60
61 /**
62 * ID for this radio button. Buttons start counting at 1 in the
63 * RadioGroup.
64 */
65 private int id;
66
67 // ------------------------------------------------------------------------
68 // Constructors -----------------------------------------------------------
69 // ------------------------------------------------------------------------
70
71 /**
72 * Public constructor.
73 *
74 * @param parent parent widget
75 * @param x column relative to parent
76 * @param y row relative to parent
77 * @param label label to display next to (right of) the radiobutton
78 * @param id ID for this radio button
79 */
80 public TRadioButton(final TRadioGroup parent, final int x, final int y,
81 final String label, final int id) {
82
83 // Set parent and window
84 super(parent, x, y, label.length() + 4, 1);
85
86 mnemonic = new MnemonicString(label);
87 this.id = id;
88
89 setCursorVisible(true);
90 setCursorX(1);
91 }
92
93 // ------------------------------------------------------------------------
94 // Event handlers ---------------------------------------------------------
95 // ------------------------------------------------------------------------
96
97 /**
98 * Returns true if the mouse is currently on the radio button.
99 *
100 * @param mouse mouse event
101 * @return if true the mouse is currently on the radio button
102 */
103 private boolean mouseOnRadioButton(final TMouseEvent mouse) {
104 if ((mouse.getY() == 0)
105 && (mouse.getX() >= 0)
106 && (mouse.getX() <= 2)
107 ) {
108 return true;
109 }
110 return false;
111 }
112
113 /**
114 * Handle mouse button presses.
115 *
116 * @param mouse mouse button press event
117 */
118 @Override
119 public void onMouseDown(final TMouseEvent mouse) {
120 if ((mouseOnRadioButton(mouse)) && (mouse.isMouse1())) {
121 // Switch state
122 selected = true;
123 ((TRadioGroup) getParent()).setSelected(this);
124 }
125 }
126
127 /**
128 * Handle keystrokes.
129 *
130 * @param keypress keystroke event
131 */
132 @Override
133 public void onKeypress(final TKeypressEvent keypress) {
134
135 if (keypress.equals(kbSpace)) {
136 selected = true;
137 ((TRadioGroup) getParent()).setSelected(this);
138 return;
139 }
140
141 if (keypress.equals(kbEsc)) {
142 TRadioGroup parent = (TRadioGroup) getParent();
143 if (parent.requiresSelection == false) {
144 selected = false;
145 parent.setSelected(0);
146 }
147 return;
148 }
149
150 // Pass to parent for the things we don't care about.
151 super.onKeypress(keypress);
152 }
153
154 // ------------------------------------------------------------------------
155 // TWidget ----------------------------------------------------------------
156 // ------------------------------------------------------------------------
157
158 /**
159 * Draw a radio button with label.
160 */
161 @Override
162 public void draw() {
163 CellAttributes radioButtonColor;
164 CellAttributes mnemonicColor;
165
166 if (isAbsoluteActive()) {
167 radioButtonColor = getTheme().getColor("tradiobutton.active");
168 mnemonicColor = getTheme().getColor("tradiobutton.mnemonic.highlighted");
169 } else {
170 radioButtonColor = getTheme().getColor("tradiobutton.inactive");
171 mnemonicColor = getTheme().getColor("tradiobutton.mnemonic");
172 }
173
174 putCharXY(0, 0, '(', radioButtonColor);
175 if (selected) {
176 putCharXY(1, 0, GraphicsChars.CP437[0x07], radioButtonColor);
177 } else {
178 putCharXY(1, 0, ' ', radioButtonColor);
179 }
180 putCharXY(2, 0, ')', radioButtonColor);
181 putStringXY(4, 0, mnemonic.getRawLabel(), radioButtonColor);
182 if (mnemonic.getShortcutIdx() >= 0) {
183 putCharXY(4 + mnemonic.getShortcutIdx(), 0,
184 mnemonic.getShortcut(), mnemonicColor);
185 }
186 }
187
188 // ------------------------------------------------------------------------
189 // TRadioButton -----------------------------------------------------------
190 // ------------------------------------------------------------------------
191
192 /**
193 * Get RadioButton state, true means selected.
194 *
195 * @return if true then this is the one button in the group that is
196 * selected
197 */
198 public boolean isSelected() {
199 return selected;
200 }
201
202 /**
203 * Set RadioButton state, true means selected. Note package private
204 * access.
205 *
206 * @param selected if true then this is the one button in the group that
207 * is selected
208 */
209 void setSelected(final boolean selected) {
210 this.selected = selected;
211 }
212
213 /**
214 * Get ID for this radio button. Buttons start counting at 1 in the
215 * RadioGroup.
216 *
217 * @return the ID
218 */
219 public int getId() {
220 return id;
221 }
222
223 /**
224 * Get the mnemonic string for this button.
225 *
226 * @return mnemonic string
227 */
228 public MnemonicString getMnemonic() {
229 return mnemonic;
230 }
231
232 }