JTextArea auto-complete test [1008913]

!7

p-awt {
  new Test().initUI();
}

sclass Test {
  class SuggestionPanel {
      private JList list;
      private JPopupMenu popupMenu;
      private String subWord;
      private final int insertionPosition;

      public SuggestionPanel(JTextArea textarea, int position, String subWord, Point location) {
          this.insertionPosition = position;
          this.subWord = subWord;
          popupMenu = new JPopupMenu();
          popupMenu.removeAll();
          popupMenu.setOpaque(false);
          popupMenu.setBorder(null);
          popupMenu.add(list = createSuggestionList(position, subWord), BorderLayout.CENTER);
          popupMenu.show(textarea, location.x, textarea.getBaseline(0, 0) + location.y);
      }

      public void hide() {
          popupMenu.setVisible(false);
          if (suggestion == this) {
              suggestion = null;
          }
      }

      private JList createSuggestionList(final int position, final String subWord) {
          Object[] data = new Object[10];
          for (int i = 0; i < data.length; i++) {
              data[i] = subWord + i;
          }
          JList list = new JList(data);
          list.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
          list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
          list.setSelectedIndex(0);
          list.addMouseListener(new MouseAdapter() {
              @Override
              public void mouseClicked(MouseEvent e) {
                  if (e.getClickCount() == 2) {
                      insertSelection();
                  }
              }
          });
          return list;
      }

      public boolean insertSelection() {
          if (list.getSelectedValue() != null) {
              try {
                  final String selectedSuggestion = ((String) list.getSelectedValue()).substring(subWord.length());
                  textarea.getDocument().insertString(insertionPosition, selectedSuggestion, null);
                  return true;
              } catch (BadLocationException e1) {
                  e1.printStackTrace();
              }
              hideSuggestion();
          }
          return false;
      }

      public void moveUp() {
          int index = Math.min(list.getSelectedIndex() - 1, 0);
          selectIndex(index);
      }

      public void moveDown() {
          int index = Math.min(list.getSelectedIndex() + 1, list.getModel().getSize() - 1);
          selectIndex(index);
      }

      private void selectIndex(int index) {
          final int position = textarea.getCaretPosition();
          list.setSelectedIndex(index);
          SwingUtilities.invokeLater(new Runnable() {
              @Override
              public void run() {
                  textarea.setCaretPosition(position);
              };
          });
      }
  }

  private SuggestionPanel suggestion;
  private JTextArea textarea;

  protected void showSuggestionLater() {
      SwingUtilities.invokeLater(new Runnable() {
          @Override
          public void run() {
              showSuggestion();
          }

      });
  }

  protected void showSuggestion() {
      hideSuggestion();
      final int position = textarea.getCaretPosition();
      Point location;
      try {
          location = textarea.modelToView(position).getLocation();
      } catch (BadLocationException e2) {
          e2.printStackTrace();
          return;
      }
      String text = textarea.getText();
      int start = Math.max(0, position - 1);
      while (start > 0) {
          if (!Character.isWhitespace(text.charAt(start))) {
              start--;
          } else {
              start++;
              break;
          }
      }
      if (start > position) {
          return;
      }
      final String subWord = text.substring(start, position);
      if (subWord.length() < 2) {
          return;
      }
      suggestion = new SuggestionPanel(textarea, position, subWord, location);
      awt { textarea.requestFocusInWindow(); }
  }

  private void hideSuggestion() {
      if (suggestion != null) {
          suggestion.hide();
      }
  }

  protected void initUI() {
      final JFrame frame = new JFrame();
      frame.setTitle("Test frame on two screens");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      JPanel panel = new JPanel(new BorderLayout());
      textarea = new JTextArea(24, 80);
      textarea.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
      textarea.addKeyListener(new KeyListener() {

          @Override
          public void keyTyped(KeyEvent e) {
              if (e.getKeyChar() == KeyEvent.VK_ENTER) {
                  if (suggestion != null) {
                      if (suggestion.insertSelection()) {
                          e.consume();
                          final int position = textarea.getCaretPosition();
                          SwingUtilities.invokeLater(new Runnable() {
                              @Override
                              public void run() {
                                  try {
                                      textarea.getDocument().remove(position - 1, 1);
                                  } catch (BadLocationException e) {
                                      e.printStackTrace();
                                  }
                              }
                          });
                      }
                  }
              }
          }

          @Override
          public void keyReleased(KeyEvent e) {
              if (e.getKeyCode() == KeyEvent.VK_DOWN && suggestion != null) {
                  suggestion.moveDown();
              } else if (e.getKeyCode() == KeyEvent.VK_UP && suggestion != null) {
                  suggestion.moveUp();
              } else if (Character.isLetterOrDigit(e.getKeyChar())) {
                  showSuggestionLater();
              } else if (Character.isWhitespace(e.getKeyChar())) {
                  hideSuggestion();
              }
          }

          @Override
          public void keyPressed(KeyEvent e) {

          }
      });
      panel.add(textarea, BorderLayout.CENTER);
      frame.add(panel);
      frame.pack();
      frame.setVisible(true);
  }
}

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1	!7
2
3	p-awt {
4	new Test().initUI();
5	}
6
7	sclass Test {
8	class SuggestionPanel {
9	private JList list;
10	private JPopupMenu popupMenu;
11	private String subWord;
12	private final int insertionPosition;
13
14	public SuggestionPanel(JTextArea textarea, int position, String subWord, Point location) {
15	this.insertionPosition = position;
16	this.subWord = subWord;
17	popupMenu = new JPopupMenu();
18	popupMenu.removeAll();
19	popupMenu.setOpaque(false);
20	popupMenu.setBorder(null);
21	popupMenu.add(list = createSuggestionList(position, subWord), BorderLayout.CENTER);
22	popupMenu.show(textarea, location.x, textarea.getBaseline(0, 0) + location.y);
23	}
24
25	public void hide() {
26	popupMenu.setVisible(false);
27	if (suggestion == this) {
28	suggestion = null;
29	}
30	}
31
32	private JList createSuggestionList(final int position, final String subWord) {
33	Object[] data = new Object[10];
34	for (int i = 0; i < data.length; i++) {
35	data[i] = subWord + i;
36	}
37	JList list = new JList(data);
38	list.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
39	list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
40	list.setSelectedIndex(0);
41	list.addMouseListener(new MouseAdapter() {
42	@Override
43	public void mouseClicked(MouseEvent e) {
44	if (e.getClickCount() == 2) {
45	insertSelection();
46	}
47	}
48	});
49	return list;
50	}
51
52	public boolean insertSelection() {
53	if (list.getSelectedValue() != null) {
54	try {
55	final String selectedSuggestion = ((String) list.getSelectedValue()).substring(subWord.length());
56	textarea.getDocument().insertString(insertionPosition, selectedSuggestion, null);
57	return true;
58	} catch (BadLocationException e1) {
59	e1.printStackTrace();
60	}
61	hideSuggestion();
62	}
63	return false;
64	}
65
66	public void moveUp() {
67	int index = Math.min(list.getSelectedIndex() - 1, 0);
68	selectIndex(index);
69	}
70
71	public void moveDown() {
72	int index = Math.min(list.getSelectedIndex() + 1, list.getModel().getSize() - 1);
73	selectIndex(index);
74	}
75
76	private void selectIndex(int index) {
77	final int position = textarea.getCaretPosition();
78	list.setSelectedIndex(index);
79	SwingUtilities.invokeLater(new Runnable() {
80	@Override
81	public void run() {
82	textarea.setCaretPosition(position);
83	};
84	});
85	}
86	}
87
88	private SuggestionPanel suggestion;
89	private JTextArea textarea;
90
91	protected void showSuggestionLater() {
92	SwingUtilities.invokeLater(new Runnable() {
93	@Override
94	public void run() {
95	showSuggestion();
96	}
97
98	});
99	}
100
101	protected void showSuggestion() {
102	hideSuggestion();
103	final int position = textarea.getCaretPosition();
104	Point location;
105	try {
106	location = textarea.modelToView(position).getLocation();
107	} catch (BadLocationException e2) {
108	e2.printStackTrace();
109	return;
110	}
111	String text = textarea.getText();
112	int start = Math.max(0, position - 1);
113	while (start > 0) {
114	if (!Character.isWhitespace(text.charAt(start))) {
115	start--;
116	} else {
117	start++;
118	break;
119	}
120	}
121	if (start > position) {
122	return;
123	}
124	final String subWord = text.substring(start, position);
125	if (subWord.length() < 2) {
126	return;
127	}
128	suggestion = new SuggestionPanel(textarea, position, subWord, location);
129	awt { textarea.requestFocusInWindow(); }
130	}
131
132	private void hideSuggestion() {
133	if (suggestion != null) {
134	suggestion.hide();
135	}
136	}
137
138	protected void initUI() {
139	final JFrame frame = new JFrame();
140	frame.setTitle("Test frame on two screens");
141	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
142	JPanel panel = new JPanel(new BorderLayout());
143	textarea = new JTextArea(24, 80);
144	textarea.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
145	textarea.addKeyListener(new KeyListener() {
146
147	@Override
148	public void keyTyped(KeyEvent e) {
149	if (e.getKeyChar() == KeyEvent.VK_ENTER) {
150	if (suggestion != null) {
151	if (suggestion.insertSelection()) {
152	e.consume();
153	final int position = textarea.getCaretPosition();
154	SwingUtilities.invokeLater(new Runnable() {
155	@Override
156	public void run() {
157	try {
158	textarea.getDocument().remove(position - 1, 1);
159	} catch (BadLocationException e) {
160	e.printStackTrace();
161	}
162	}
163	});
164	}
165	}
166	}
167	}
168
169	@Override
170	public void keyReleased(KeyEvent e) {
171	if (e.getKeyCode() == KeyEvent.VK_DOWN && suggestion != null) {
172	suggestion.moveDown();
173	} else if (e.getKeyCode() == KeyEvent.VK_UP && suggestion != null) {
174	suggestion.moveUp();
175	} else if (Character.isLetterOrDigit(e.getKeyChar())) {
176	showSuggestionLater();
177	} else if (Character.isWhitespace(e.getKeyChar())) {
178	hideSuggestion();
179	}
180	}
181
182	@Override
183	public void keyPressed(KeyEvent e) {
184
185	}
186	});
187	panel.add(textarea, BorderLayout.CENTER);
188	frame.add(panel);
189	frame.pack();
190	frame.setVisible(true);
191	}
192	}

Snippet ID:	#1008913
Snippet name:	JTextArea auto-complete test
Eternal ID of this version:	#1008913/1
Text MD5:	6580653918ed28f5fd3b45cd35846273
Transpilation MD5:	6fd2efce8d1124deac6d5d5f6ca9ecd8
Author:	stefan
Category:	javax / gui
Type:	JavaX source code
Public (visible to everyone):	Yes
Archived (hidden from active list):	No
Created/modified:	2017-06-18 17:00:15
Source code size:	6398 bytes / 192 lines
Pitched / IR pitched:	No / No
Views / Downloads:	389 / 465
Referenced in:	[show references]

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JavaX source code [tags: use-pretranspiled] - run with: x30.jar

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