1 /*

     2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package jdk.internal.jshell.tool;

    27 

    28 import java.awt.BorderLayout;

    29 import java.awt.FlowLayout;

    30 import java.awt.event.KeyEvent;

    31 import java.awt.event.WindowAdapter;

    32 import java.awt.event.WindowEvent;

    33 import java.util.concurrent.CountDownLatch;

    34 import java.util.function.Consumer;

    35 import javax.swing.JButton;

    36 import javax.swing.JFrame;

    37 import javax.swing.JPanel;

    38 import javax.swing.JScrollPane;

    39 import javax.swing.JTextArea;

    40 import javax.swing.SwingUtilities;

    41 

    42 /**

    43  * A minimal Swing editor as a fallback when the user does not specify an

    44  * external editor.

    45  */

    46 @SuppressWarnings("serial")             // serialVersionUID intentionally omitted

    47 public class EditPad extends JFrame implements Runnable {

    48     private final Consumer<String> errorHandler; // For possible future error handling

    49     private final String initialText;

    50     private final CountDownLatch closeLock;

    51     private final Consumer<String> saveHandler;

    52 

    53     EditPad(Consumer<String> errorHandler, String initialText,

    54             CountDownLatch closeLock, Consumer<String> saveHandler) {

    55         super("JShell Edit Pad");

    56         this.errorHandler = errorHandler;

    57         this.initialText = initialText;

    58         this.closeLock = closeLock;

    59         this.saveHandler = saveHandler;

    60     }

    61 

    62     @Override

    63     public void run() {

    64         addWindowListener(new WindowAdapter() {

    65             @Override

    66             public void windowClosing(WindowEvent e) {

    67                 EditPad.this.dispose();

    68                 closeLock.countDown();

    69             }

    70         });

    71         setLocationRelativeTo(null);

    72         setLayout(new BorderLayout());

    73         JTextArea textArea = new JTextArea(initialText);

    74         add(new JScrollPane(textArea), BorderLayout.CENTER);

    75         add(buttons(textArea), BorderLayout.SOUTH);

    76 

    77         setSize(800, 600);

    78         setVisible(true);

    79     }

    80 

    81     private JPanel buttons(JTextArea textArea) {

    82         FlowLayout flow = new FlowLayout();

    83         flow.setHgap(35);

    84         JPanel buttons = new JPanel(flow);

    85         JButton cancel = new JButton("Cancel");

    86         cancel.setMnemonic(KeyEvent.VK_C);

    87         JButton accept = new JButton("Accept");

    88         accept.setMnemonic(KeyEvent.VK_A);

    89         JButton exit = new JButton("Exit");

    90         exit.setMnemonic(KeyEvent.VK_X);

    91         buttons.add(cancel);

    92         buttons.add(accept);

    93         buttons.add(exit);

    94 

    95         cancel.addActionListener(e -> {

    96             close();

    97         });

    98         accept.addActionListener(e -> {

    99             saveHandler.accept(textArea.getText());

   100         });

   101         exit.addActionListener(e -> {

   102             saveHandler.accept(textArea.getText());

   103             close();

   104         });

   105 

   106         return buttons;

   107     }

   108 

   109     private void close() {

   110         setVisible(false);

   111         dispose();

   112         closeLock.countDown();

   113     }

   114 

   115     public static void edit(Consumer<String> errorHandler, String initialText,

   116             Consumer<String> saveHandler) {

   117         CountDownLatch closeLock = new CountDownLatch(1);

   118         SwingUtilities.invokeLater(

   119                 new EditPad(errorHandler, initialText, closeLock, saveHandler));

   120         do {

   121             try {

   122                 closeLock.await();

   123                 break;

   124             } catch (InterruptedException ex) {

   125                 // ignore and loop

   126             }

   127         } while (true);

   128     }

   129 }