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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 java.io.File; | |
34 | import java.util.ArrayList; | |
35 | import java.util.List; | |
36 | ||
37 | import jexer.bits.CellAttributes; | |
38 | import jexer.event.TKeypressEvent; | |
39 | import jexer.event.TMouseEvent; | |
40 | import static jexer.TKeypress.*; | |
41 | ||
42 | /** | |
43 | * TDirectoryList shows the files within a directory. | |
44 | */ | |
45 | public class TDirectoryList extends TWidget { | |
46 | ||
47 | /** | |
48 | * Files in the directory. | |
49 | */ | |
50 | private List<File> files; | |
51 | ||
52 | /** | |
53 | * Selected file. | |
54 | */ | |
55 | private int selectedFile = -1; | |
56 | ||
57 | /** | |
58 | * Root path containing files to display. | |
59 | */ | |
60 | public File path; | |
61 | ||
62 | /** | |
63 | * Vertical scrollbar. | |
64 | */ | |
65 | private TVScroller vScroller; | |
66 | ||
67 | /** | |
68 | * Horizontal scrollbar. | |
69 | */ | |
70 | private THScroller hScroller; | |
71 | ||
72 | /** | |
73 | * Maximum width of a single line. | |
74 | */ | |
75 | private int maxLineWidth; | |
76 | ||
77 | /** | |
78 | * The action to perform when the user selects an item. | |
79 | */ | |
80 | private TAction action = null; | |
81 | ||
82 | /** | |
83 | * Perform user selection action. | |
84 | */ | |
85 | public void dispatch() { | |
86 | assert (selectedFile >= 0); | |
87 | assert (selectedFile < files.size()); | |
88 | if (action != null) { | |
89 | action.DO(); | |
90 | } | |
91 | } | |
92 | ||
93 | /** | |
94 | * Format one of the entries for drawing on the screen. | |
95 | * | |
96 | * @param index index into files | |
97 | * @return the line to draw | |
98 | */ | |
99 | private String renderFile(int index) { | |
100 | File file = files.get(index); | |
101 | String name = file.getName(); | |
102 | if (name.length() > 20) { | |
103 | name = name.substring(0, 17) + "..."; | |
104 | } | |
105 | return String.format("%-20s %5dk", name, (file.length() / 1024)); | |
106 | } | |
107 | ||
108 | /** | |
109 | * Resize for a new width/height. | |
110 | */ | |
111 | public void reflow() { | |
112 | ||
113 | // Reset the lines | |
114 | selectedFile = -1; | |
115 | maxLineWidth = 0; | |
116 | files.clear(); | |
117 | ||
118 | // Build a list of files in this directory | |
119 | File [] newFiles = path.listFiles(); | |
120 | for (int i = 0; i < newFiles.length; i++) { | |
121 | if (newFiles[i].getName().startsWith(".")) { | |
122 | continue; | |
123 | } | |
124 | if (newFiles[i].isDirectory()) { | |
125 | continue; | |
126 | } | |
127 | files.add(newFiles[i]); | |
128 | } | |
129 | ||
130 | for (int i = 0; i < files.size(); i++) { | |
131 | String line = renderFile(i); | |
132 | if (line.length() > maxLineWidth) { | |
133 | maxLineWidth = line.length(); | |
134 | } | |
135 | } | |
136 | ||
137 | // Start at the top | |
138 | if (vScroller == null) { | |
139 | vScroller = new TVScroller(this, getWidth() - 1, 0, | |
140 | getHeight() - 1); | |
141 | } else { | |
142 | vScroller.setX(getWidth() - 1); | |
143 | vScroller.setHeight(getHeight() - 1); | |
144 | } | |
145 | vScroller.setBottomValue(files.size() - getHeight() - 1); | |
146 | vScroller.setTopValue(0); | |
147 | vScroller.setValue(0); | |
148 | if (vScroller.getBottomValue() < 0) { | |
149 | vScroller.setBottomValue(0); | |
150 | } | |
151 | vScroller.setBigChange(getHeight() - 1); | |
152 | ||
153 | // Start at the left | |
154 | if (hScroller == null) { | |
155 | hScroller = new THScroller(this, 0, getHeight() - 1, | |
156 | getWidth() - 1); | |
157 | } else { | |
158 | hScroller.setY(getHeight() - 1); | |
159 | hScroller.setWidth(getWidth() - 1); | |
160 | } | |
161 | hScroller.setRightValue(maxLineWidth - getWidth() + 1); | |
162 | hScroller.setLeftValue(0); | |
163 | hScroller.setValue(0); | |
164 | if (hScroller.getRightValue() < 0) { | |
165 | hScroller.setRightValue(0); | |
166 | } | |
167 | hScroller.setBigChange(getWidth() - 1); | |
168 | } | |
169 | ||
170 | /** | |
171 | * Public constructor. | |
172 | * | |
173 | * @param parent parent widget | |
174 | * @param path directory path, must be a directory | |
175 | * @param x column relative to parent | |
176 | * @param y row relative to parent | |
177 | * @param width width of text area | |
178 | * @param height height of text area | |
179 | */ | |
180 | public TDirectoryList(final TWidget parent, final String path, final int x, | |
181 | final int y, final int width, final int height) { | |
182 | ||
183 | this(parent, path, x, y, width, height, null); | |
184 | } | |
185 | ||
186 | /** | |
187 | * Public constructor. | |
188 | * | |
189 | * @param parent parent widget | |
190 | * @param path directory path, must be a directory | |
191 | * @param x column relative to parent | |
192 | * @param y row relative to parent | |
193 | * @param width width of text area | |
194 | * @param height height of text area | |
195 | * @param action action to perform when an item is selected | |
196 | */ | |
197 | public TDirectoryList(final TWidget parent, final String path, final int x, | |
198 | final int y, final int width, final int height, final TAction action) { | |
199 | ||
200 | this.path = new File(path); | |
201 | this.action = action; | |
202 | files = new ArrayList<File>(); | |
203 | reflow(); | |
204 | } | |
205 | ||
206 | /** | |
207 | * Draw the files list. | |
208 | */ | |
209 | @Override | |
210 | public void draw() { | |
211 | CellAttributes color = null; | |
212 | int begin = vScroller.getValue(); | |
213 | int topY = 0; | |
214 | for (int i = begin; i < files.size() - 1; i++) { | |
215 | String line = renderFile(i); | |
216 | if (hScroller.getValue() < line.length()) { | |
217 | line = line.substring(hScroller.getValue()); | |
218 | } else { | |
219 | line = ""; | |
220 | } | |
221 | if (i == selectedFile) { | |
222 | color = getTheme().getColor("tdirectorylist.selected"); | |
223 | } else if (isAbsoluteActive()) { | |
224 | color = getTheme().getColor("tdirectorylist"); | |
225 | } else { | |
226 | color = getTheme().getColor("tdirectorylist.inactive"); | |
227 | } | |
228 | String formatString = "%-" + Integer.toString(getWidth() - 1) + "s"; | |
229 | getScreen().putStringXY(0, topY, String.format(formatString, line), | |
230 | color); | |
231 | topY++; | |
232 | if (topY >= getHeight() - 1) { | |
233 | break; | |
234 | } | |
235 | } | |
236 | ||
237 | // Pad the rest with blank lines | |
238 | for (int i = topY; i < getHeight() - 1; i++) { | |
239 | getScreen().hLineXY(0, i, getWidth() - 1, ' ', color); | |
240 | } | |
241 | } | |
242 | ||
243 | /** | |
244 | * Handle mouse press events. | |
245 | * | |
246 | * @param mouse mouse button press event | |
247 | */ | |
248 | @Override | |
249 | public void onMouseDown(final TMouseEvent mouse) { | |
250 | if (mouse.isMouseWheelUp()) { | |
251 | vScroller.decrement(); | |
252 | return; | |
253 | } | |
254 | if (mouse.isMouseWheelDown()) { | |
255 | vScroller.increment(); | |
256 | return; | |
257 | } | |
258 | ||
259 | if ((mouse.getX() < getWidth() - 1) | |
260 | && (mouse.getY() < getHeight() - 1)) { | |
261 | if (vScroller.getValue() + mouse.getY() < files.size()) { | |
262 | selectedFile = vScroller.getValue() + mouse.getY(); | |
263 | } | |
264 | path = files.get(selectedFile); | |
265 | dispatch(); | |
266 | return; | |
267 | } | |
268 | ||
269 | // Pass to children | |
270 | super.onMouseDown(mouse); | |
271 | } | |
272 | ||
273 | /** | |
274 | * Handle mouse release events. | |
275 | * | |
276 | * @param mouse mouse button release event | |
277 | */ | |
278 | @Override | |
279 | public void onMouseUp(final TMouseEvent mouse) { | |
280 | // Pass to children | |
281 | super.onMouseDown(mouse); | |
282 | } | |
283 | ||
284 | /** | |
285 | * Handle keystrokes. | |
286 | * | |
287 | * @param keypress keystroke event | |
288 | */ | |
289 | @Override | |
290 | public void onKeypress(final TKeypressEvent keypress) { | |
291 | if (keypress.equals(kbLeft)) { | |
292 | hScroller.decrement(); | |
293 | } else if (keypress.equals(kbRight)) { | |
294 | hScroller.increment(); | |
295 | } else if (keypress.equals(kbUp)) { | |
296 | vScroller.decrement(); | |
297 | } else if (keypress.equals(kbDown)) { | |
298 | vScroller.increment(); | |
299 | } else if (keypress.equals(kbPgUp)) { | |
300 | vScroller.bigDecrement(); | |
301 | } else if (keypress.equals(kbPgDn)) { | |
302 | vScroller.bigIncrement(); | |
303 | } else if (keypress.equals(kbHome)) { | |
304 | vScroller.toTop(); | |
305 | } else if (keypress.equals(kbEnd)) { | |
306 | vScroller.toBottom(); | |
307 | } else { | |
308 | // Pass other keys (tab etc.) on | |
309 | super.onKeypress(keypress); | |
310 | } | |
311 | } | |
312 | ||
313 | } |