src/jexer/TFileOpenBox.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 java.io.File;
  32 import java.io.IOException;
  33 import java.util.List;
  34 import java.util.ResourceBundle;
  35
  36 import jexer.backend.SwingTerminal;
  37 import jexer.bits.GraphicsChars;
  38 import jexer.event.TKeypressEvent;
  39 import jexer.ttree.TDirectoryTreeItem;
  40 import jexer.ttree.TTreeItem;
  41 import jexer.ttree.TTreeViewWidget;
  42 import static jexer.TKeypress.*;
  43
  44 /**
  45  * TFileOpenBox is a system-modal dialog for selecting a file to open.  Call
  46  * it like:
  47  *
  48  * <pre>
  49  * {@code
  50  *     filename = application.fileOpenBox("/path/to/file.ext",
  51  *         TFileOpenBox.Type.OPEN);
  52  *     if (filename != null) {
  53  *         ... the user selected a file, go open it ...
  54  *     }
  55  * }
  56  * </pre>
  57  *
  58  */
  59 public class TFileOpenBox extends TWindow {
  60
  61     /**
  62      * Translated strings.
  63      */
  64     private static final ResourceBundle i18n = ResourceBundle.getBundle(TFileOpenBox.class.getName());
  65
  66     // ------------------------------------------------------------------------
  67     // Constants --------------------------------------------------------------
  68     // ------------------------------------------------------------------------
  69
  70     /**
  71      * TFileOpenBox can be called for either Open or Save actions.
  72      */
  73     public enum Type {
  74         /**
  75          * Button will be labeled "Open".
  76          */
  77         OPEN,
  78
  79         /**
  80          * Button will be labeled "Save".
  81          */
  82         SAVE,
  83
  84         /**
  85          * Button will be labeled "Select".
  86          */
  87         SELECT
  88     }
  89
  90     // ------------------------------------------------------------------------
  91     // Variables --------------------------------------------------------------
  92     // ------------------------------------------------------------------------
  93
  94     /**
  95      * String to return, or null if the user canceled.
  96      */
  97     private String filename = null;
  98
  99     /**
 100      * The left-side tree view pane.
 101      */
 102     private TTreeViewWidget treeView;
 103
 104     /**
 105      * The data behind treeView.
 106      */
 107     private TDirectoryTreeItem treeViewRoot;
 108
 109     /**
 110      * The right-side directory list pane.
 111      */
 112     private TDirectoryList directoryList;
 113
 114     /**
 115      * The top row text field.
 116      */
 117     private TField entryField;
 118
 119     /**
 120      * The Open or Save button.
 121      */
 122     private TButton openButton;
 123
 124     /**
 125      * The type of box this is (OPEN, SAVE, or SELECT).
 126      */
 127     private Type type = Type.OPEN;
 128
 129     // ------------------------------------------------------------------------
 130     // Constructors -----------------------------------------------------------
 131     // ------------------------------------------------------------------------
 132
 133     /**
 134      * Public constructor.  The file open box will be centered on screen.
 135      *
 136      * @param application the TApplication that manages this window
 137      * @param path path of selected file
 138      * @param type one of the Type constants
 139      * @throws IOException of a java.io operation throws
 140      */
 141     public TFileOpenBox(final TApplication application, final String path,
 142         final Type type) throws IOException {
 143
 144         this(application, path, type, null);
 145     }
 146
 147     /**
 148      * Public constructor.  The file open box will be centered on screen.
 149      *
 150      * @param application the TApplication that manages this window
 151      * @param path path of selected file
 152      * @param type one of the Type constants
 153      * @param filters a list of strings that files must match to be displayed
 154      * @throws IOException of a java.io operation throws
 155      */
 156     public TFileOpenBox(final TApplication application, final String path,
 157         final Type type, final List<String> filters) throws IOException {
 158
 159         // Register with the TApplication
 160         super(application, "", 0, 0, 76, 22, MODAL);
 161
 162         // Add text field
 163         entryField = addField(1, 1, getWidth() - 4, false,
 164             (new File(path)).getCanonicalPath(),
 165             new TAction() {
 166                 public void DO() {
 167                     try {
 168                         checkFilename(entryField.getText());
 169                     } catch (IOException e) {
 170                         // If the backend is Swing, we can emit the stack
 171                         // trace to stderr.  Otherwise, just squash it.
 172                         if (getScreen() instanceof SwingTerminal) {
 173                             e.printStackTrace();
 174                         }
 175                     }
 176                 }
 177             }, null);
 178         entryField.onKeypress(new TKeypressEvent(kbEnd));
 179
 180         // Add directory treeView
 181         treeView = addTreeViewWidget(1, 3, 30, getHeight() - 6,
 182             new TAction() {
 183                 public void DO() {
 184                     TTreeItem item = treeView.getSelected();
 185                     File selectedDir = ((TDirectoryTreeItem) item).getFile();
 186                     try {
 187                         directoryList.setPath(selectedDir.getCanonicalPath());
 188                         entryField.setText(selectedDir.getCanonicalPath());
 189                         if (type == Type.OPEN) {
 190                             openButton.setEnabled(false);
 191                         }
 192                         activate(treeView);
 193                     } catch (IOException e) {
 194                         // If the backend is Swing, we can emit the stack
 195                         // trace to stderr.  Otherwise, just squash it.
 196                         if (getScreen() instanceof SwingTerminal) {
 197                             e.printStackTrace();
 198                         }
 199                     }
 200                 }
 201             }
 202         );
 203         treeViewRoot = new TDirectoryTreeItem(treeView, path, true);
 204
 205         // Add directory files list
 206         directoryList = addDirectoryList(path, 34, 3, 28, getHeight() - 6,
 207             new TAction() {
 208                 public void DO() {
 209                     try {
 210                         File newPath = directoryList.getPath();
 211                         entryField.setText(newPath.getCanonicalPath());
 212                         entryField.onKeypress(new TKeypressEvent(kbEnd));
 213                         openButton.setEnabled(true);
 214                         activate(entryField);
 215                         checkFilename(entryField.getText());
 216                     } catch (IOException e) {
 217                         // If the backend is Swing, we can emit the stack
 218                         // trace to stderr.  Otherwise, just squash it.
 219                         if (getScreen() instanceof SwingTerminal) {
 220                             e.printStackTrace();
 221                         }
 222                     }
 223                 }
 224             },
 225             new TAction() {
 226                 public void DO() {
 227                     try {
 228                         File newPath = directoryList.getPath();
 229                         entryField.setText(newPath.getCanonicalPath());
 230                         entryField.onKeypress(new TKeypressEvent(kbEnd));
 231                         openButton.setEnabled(true);
 232                         activate(entryField);
 233                     } catch (IOException e) {
 234                         // If the backend is Swing, we can emit the stack
 235                         // trace to stderr.  Otherwise, just squash it.
 236                         if (getScreen() instanceof SwingTerminal) {
 237                             e.printStackTrace();
 238                         }
 239                     }
 240                 }
 241             },
 242             filters);
 243
 244         String openLabel = "";
 245         switch (type) {
 246         case OPEN:
 247             openLabel = i18n.getString("openButton");
 248             setTitle(i18n.getString("openTitle"));
 249             break;
 250         case SAVE:
 251             openLabel = i18n.getString("saveButton");
 252             setTitle(i18n.getString("saveTitle"));
 253             break;
 254         case SELECT:
 255             openLabel = i18n.getString("selectButton");
 256             setTitle(i18n.getString("selectTitle"));
 257             break;
 258         default:
 259             throw new IllegalArgumentException("Invalid type: " + type);
 260         }
 261         this.type = type;
 262
 263         // Setup button actions
 264         openButton = addButton(openLabel, this.getWidth() - 12, 3,
 265             new TAction() {
 266                 public void DO() {
 267                     try {
 268                         checkFilename(entryField.getText());
 269                     } catch (IOException e) {
 270                         // If the backend is Swing, we can emit the stack
 271                         // trace to stderr.  Otherwise, just squash it.
 272                         if (getScreen() instanceof SwingTerminal) {
 273                             e.printStackTrace();
 274                         }
 275                     }
 276                 }
 277             }
 278         );
 279         if (type == Type.OPEN) {
 280             openButton.setEnabled(false);
 281         }
 282
 283         addButton(i18n.getString("cancelButton"), getWidth() - 12, 5,
 284             new TAction() {
 285                 public void DO() {
 286                     filename = null;
 287                     getApplication().closeWindow(TFileOpenBox.this);
 288                 }
 289             }
 290         );
 291
 292         // Default to the directory list
 293         activate(directoryList);
 294
 295         // Set the secondaryFiber to run me
 296         getApplication().enableSecondaryEventReceiver(this);
 297
 298         // Yield to the secondary thread.  When I come back from the
 299         // constructor response will already be set.
 300         getApplication().yield();
 301     }
 302
 303     // ------------------------------------------------------------------------
 304     // Event handlers ---------------------------------------------------------
 305     // ------------------------------------------------------------------------
 306
 307     /**
 308      * Handle keystrokes.
 309      *
 310      * @param keypress keystroke event
 311      */
 312     @Override
 313     public void onKeypress(final TKeypressEvent keypress) {
 314         // Escape - behave like cancel
 315         if (keypress.equals(kbEsc)) {
 316             // Close window
 317             filename = null;
 318             getApplication().closeWindow(this);
 319             return;
 320         }
 321
 322         if (treeView.isActive()) {
 323             if ((keypress.equals(kbEnter))
 324                 || (keypress.equals(kbUp))
 325                 || (keypress.equals(kbDown))
 326                 || (keypress.equals(kbPgUp))
 327                 || (keypress.equals(kbPgDn))
 328                 || (keypress.equals(kbHome))
 329                 || (keypress.equals(kbEnd))
 330             ) {
 331                 // Tree view will be changing, update the directory list.
 332                 super.onKeypress(keypress);
 333
 334                 // This is the same action as treeView's enter.
 335                 TTreeItem item = treeView.getSelected();
 336                 File selectedDir = ((TDirectoryTreeItem) item).getFile();
 337                 try {
 338                     directoryList.setPath(selectedDir.getCanonicalPath());
 339                     if (type == Type.OPEN) {
 340                         openButton.setEnabled(false);
 341                     }
 342                     activate(treeView);
 343                 } catch (IOException e) {
 344                     // If the backend is Swing, we can emit the stack trace
 345                     // to stderr.  Otherwise, just squash it.
 346                     if (getScreen() instanceof SwingTerminal) {
 347                         e.printStackTrace();
 348                     }
 349                 }
 350                 return;
 351             }
 352         }
 353
 354         // Pass to my parent
 355         super.onKeypress(keypress);
 356     }
 357
 358     // ------------------------------------------------------------------------
 359     // TWidget ----------------------------------------------------------------
 360     // ------------------------------------------------------------------------
 361
 362     /**
 363      * Draw me on screen.
 364      */
 365     @Override
 366     public void draw() {
 367         super.draw();
 368         vLineXY(33, 4, getHeight() - 6, GraphicsChars.WINDOW_SIDE,
 369             getBackground());
 370     }
 371
 372     // ------------------------------------------------------------------------
 373     // TFileOpenBox -----------------------------------------------------------
 374     // ------------------------------------------------------------------------
 375
 376     /**
 377      * Get the return string.
 378      *
 379      * @return the filename the user selected, or null if they canceled.
 380      */
 381     public String getFilename() {
 382         return filename;
 383     }
 384
 385     /**
 386      * See if there is a valid filename to return.  If the filename is a
 387      * directory, then
 388      *
 389      * @param newFilename the filename to check and return
 390      * @throws IOException of a java.io operation throws
 391      */
 392     private void checkFilename(final String newFilename) throws IOException {
 393         File newFile = new File(newFilename);
 394         if (newFile.exists()) {
 395             if (newFile.isFile() || (type == Type.SELECT)) {
 396                 filename = newFilename;
 397                 getApplication().closeWindow(this);
 398                 return;
 399             }
 400             if (newFile.isDirectory()) {
 401                 treeViewRoot = new TDirectoryTreeItem(treeView,
 402                     newFilename, true);
 403                 treeView.setTreeRoot(treeViewRoot, true);
 404                 if (type == Type.OPEN) {
 405                     openButton.setEnabled(false);
 406                 }
 407                 directoryList.setPath(newFilename);
 408             }
 409         } else if (type != Type.OPEN) {
 410             filename = newFilename;
 411             getApplication().closeWindow(this);
 412             return;
 413         }
 414     }
 415
 416 }