Java Swing Tips: JTextComponent

Showing posts with label JTextComponent. Show all posts

2025/03/31

Rounds all corners of a JTextComponent's selection highlight polygon and fills it with a translucent background color

Code

class RoundedSelectionHighlightPainter extends DefaultHighlightPainter {
  protected RoundedSelectionHighlightPainter() {
    super(null);
  }

  @Override public void paint(
      Graphics g, int offs0, int offs1, Shape bounds, JTextComponent c) {
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setRenderingHint(
      RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    int rgba = c.getSelectionColor().getRGB() & 0xFF_FF_FF | (64 << 24);
    g2.setColor(new Color(rgba, true));
    try {
      Area area = getLinesArea(c, offs0, offs1);
      for (Area a : GeomUtils.singularization(area)) {
        List<Point2D> lst = GeomUtils.convertAreaToPoint2DList(a);
        GeomUtils.flatteningStepsOnRightSide(lst, 3d * 2d);
        g2.fill(GeomUtils.convertRoundedPath(lst, 3d));
      }
    } catch (BadLocationException ex) {
      // can't render
      Logger.getGlobal().severe(ex::getMessage);
    }
    g2.dispose();
  }

  private static Area getLinesArea(JTextComponent c, int offs0, int offs1)
      throws BadLocationException {
    TextUI mapper = c.getUI();
    Area area = new Area();
    int cur = offs0;
    do {
      int startOffset = Utilities.getRowStart(c, cur);
      int endOffset = Utilities.getRowEnd(c, cur);
      Rectangle p0 = mapper.modelToView(c, Math.max(startOffset, offs0));
      Rectangle p1 = mapper.modelToView(c, Math.min(endOffset, offs1));
      if (offs1 > endOffset) {
        p1.width += 6;
      }
      addRectToArea(area, p0.union(p1));
      cur = endOffset + 1;
    } while (cur < offs1);
    return area;
  }

  private static void addRectToArea(Area area, Rectangle rect) {
    area.add(new Area(rect));
  }
}

class RoundedSelectionCaret extends DefaultCaret {
  @Override protected HighlightPainter getSelectionPainter() {
    return new RoundedSelectionHighlightPainter();
  }

  @SuppressWarnings("PMD.AvoidSynchronizedAtMethodLevel")
  @Override protected synchronized void damage(Rectangle r) {
    JTextComponent c = getComponent();
    int startOffset = c.getSelectionStart();
    int endOffset = c.getSelectionEnd();
    if (startOffset == endOffset) {
      super.damage(r);
    } else {
      TextUI mapper = c.getUI();
      try {
        Rectangle p0 = mapper.modelToView(c, startOffset);
        Rectangle p1 = mapper.modelToView(c, endOffset);
        int h = (int) (p1.getMaxY() - p0.getMinY());
        c.repaint(new Rectangle(0, p0.y, c.getWidth(), h));
      } catch (BadLocationException ex) {
        UIManager.getLookAndFeel().provideErrorFeedback(c);
      }
    }
  }
}

References

2019/11/29

Change the word selection behavior by double clicking the mouse in JTextArea

Code

class SelectWordCaret extends DefaultCaret {
  private SelectingMode selectingMode = SelectingMode.CHAR;
  private int p0; // = Math.min(getDot(), getMark());
  private int p1; // = Math.max(getDot(), getMark());

  @Override public void mousePressed(MouseEvent e) {
    super.mousePressed(e);
    int clickCount = e.getClickCount();
    if (SwingUtilities.isLeftMouseButton(e) && !e.isConsumed()) {
      if (clickCount == 2) {
        selectingMode = SelectingMode.WORD;
        p0 = Math.min(getDot(), getMark());
        p1 = Math.max(getDot(), getMark());
      } else if (clickCount >= 3) {
        selectingMode = SelectingMode.ROW;
        JTextComponent target = getComponent();
        int offs = target.getCaretPosition();
        try {
          p0 = Utilities.getRowStart(target, offs);
          p1 = Utilities.getRowEnd(target, offs);
          setDot(p0);
          moveDot(p1);
        } catch (BadLocationException ex) {
          UIManager.getLookAndFeel().provideErrorFeedback(target);
        }
      }
    } else {
      selectingMode = SelectingMode.CHAR;
    }
  }

  @Override public void mouseDragged(MouseEvent e) {
    if (!e.isConsumed() && SwingUtilities.isLeftMouseButton(e)) {
      if (selectingMode == SelectingMode.WORD) {
        continuouslySelectWords(e);
      } else if (selectingMode == SelectingMode.ROW) {
        continuouslySelectRows(e);
      }
    } else {
      super.mouseDragged(e);
    }
  }

  // If you continue to drag the mouse after selecting a word with double press:
  private void continuouslySelectWords(MouseEvent e) {
    Position.Bias[] biasRet = new Position.Bias[1];
    JTextComponent c = getComponent();
    int pos = getCaretPositionByLocation(c, e.getPoint(), biasRet);
    try {
      if (p0 < pos && pos < p1) {
        setDot(p0);
        moveDot(p1, biasRet[0]);
      } else if (p1 < pos) {
        setDot(p0);
        moveDot(Utilities.getWordEnd(c, pos), biasRet[0]);
      } else if (p0 > pos) {
        setDot(p1);
        moveDot(Utilities.getWordStart(c, pos), biasRet[0]);
      }
    } catch (BadLocationException ex) {
      UIManager.getLookAndFeel().provideErrorFeedback(c);
    }
  }

  // If you drag the mouse continuously after selecting the entire line in triple press:
  private void continuouslySelectRows(MouseEvent e) {
    Position.Bias[] biasRet = new Position.Bias[1];
    JTextComponent c = getComponent();
    int pos = getCaretPositionByLocation(c, e.getPoint(), biasRet);
    try {
      if (p0 < pos && pos < p1) {
        setDot(p0);
        moveDot(p1, biasRet[0]);
      } else if (p1 < pos) {
        setDot(p0);
        moveDot(Utilities.getRowEnd(c, pos), biasRet[0]);
      } else if (p0 > pos) {
        setDot(p1);
        moveDot(Utilities.getRowStart(c, pos), biasRet[0]);
      }
    } catch (BadLocationException ex) {
      UIManager.getLookAndFeel().provideErrorFeedback(c);
    }
  }
  // ...
}

References

2015/12/28

Copy on select for JTextArea

Code

class CopyOnSelectListener
    extends MouseAdapter
    implements CaretListener, KeyListener {
  private boolean dragActive;
  private boolean shiftActive;
  private int dot;
  private int mark;

  @Override public final void caretUpdate(CaretEvent e) {
    if (!dragActive) {
      fire(e.getSource());
    }
  }

  @Override public final void mousePressed(MouseEvent e) {
    dragActive = true;
  }

  @Override public final void mouseReleased(MouseEvent e) {
    dragActive = false;
    fire(e.getSource());
  }

  @Override public void keyPressed(KeyEvent e) {
    shiftActive = (e.getModifiersEx() & KeyEvent.SHIFT_DOWN_MASK) != 0;
  }

  @Override public void keyReleased(KeyEvent e) {
    shiftActive = (e.getModifiersEx() & KeyEvent.SHIFT_DOWN_MASK) != 0;
    if (!shiftActive) {
      fire(e.getSource());
    }
  }

  @Override public void keyTyped(KeyEvent e) {
    /* empty */
  }

  private void fire(Object c) {
    if (c instanceof JTextComponent) {
      JTextComponent tc = (JTextComponent) c;
      Caret caret = tc.getCaret();
      int d = caret.getDot();
      int m = caret.getMark();
      if (d != m && (dot != d || mark != m)) {
        String str = tc.getSelectedText();
        if (Objects.nonNull(str)) {
          // StringSelection data = new StringSelection(str);
          // Toolkit tk = Toolkit.getDefaultToolkit();
          // tk.getSystemClipboard().setContents(data, data);
          tc.copy();
        }
      }
      dot = d;
      mark = m;
    }
  }
}

References

Copy on select for JTextArea(Japanese)

2014/06/29

Merge the ReplaceEdit(remove and insertString edit) into a single CompoundEdit

Code

class DocumentFilterUndoManager extends UndoManager {
  private CompoundEdit compoundEdit;
  public final DocumentFilter undoFilter = new DocumentFilter() {
    @Override public void replace(
        DocumentFilter.FilterBypass fb,
        int offset, int length, String text,
        AttributeSet attrs) throws BadLocationException {
      if (length == 0) {
        fb.insertString(offset, text, attrs);
      } else {
        compoundEdit = new CompoundEdit();
        fb.replace(offset, length, text, attrs);
        compoundEdit.end();
        addEdit(compoundEdit);
        compoundEdit = null;
      }
    }
  };
  @Override public void undoableEditHappened(UndoableEditEvent e) {
    if (compoundEdit == null) {
      addEdit(e.getEdit());
    } else {
      compoundEdit.addEdit(e.getEdit());
    }
  }
}

References

Merge the ReplaceEdit(remove and insertString edit) into a single CompoundEdit(Japanese)

2013/01/28

JScrollBar search highlighter

Code

Override WindowsScrollBarUI#paintTrack(...)

scrollbar.setUI(new WindowsScrollBarUI() {
  @Override protected void paintTrack(
      Graphics g, JComponent c, Rectangle trackBounds) {
    super.paintTrack(g, c, trackBounds);

    Rectangle rect = textArea.getBounds();
    double sy = trackBounds.getHeight() / rect.getHeight();
    AffineTransform at = AffineTransform.getScaleInstance(1.0, sy);
    Highlighter highlighter = textArea.getHighlighter();
    g.setColor(Color.YELLOW);
    try {
      for (Highlighter.Highlight hh : highlighter.getHighlights()) {
        Rectangle r = textArea.modelToView(hh.getStartOffset());
        Rectangle s = at.createTransformedShape(r).getBounds();
        int h = 2; // Math.max(2, s.height - 2);
        g.fillRect(trackBounds.x, trackBounds.y + s.y, trackBounds.width, h);
      }
    }catch (BadLocationException ex) {
      ex.printStackTrace();
    }
  }
});

JLabel + Icon + RowHeader

Code

final JScrollPane scroll = new JScrollPane(textArea);
JLabel label = new JLabel(new Icon() {
  private final Color THUMB_COLOR = new Color(0, 0, 255, 50);
  private final Rectangle thumbRect = new Rectangle();
  private final JTextComponent textArea;
  private final JScrollBar scrollbar;

  public HighlightIcon(JTextComponent textArea, JScrollBar scrollbar) {
    this.textArea = textArea;
    this.scrollbar = scrollbar;
  }

  @Override public void paintIcon(Component c, Graphics g, int x, int y) {
    // Rectangle rect   = textArea.getBounds();
    // Dimension sbSize = scrollbar.getSize();
    // Insets sbInsets  = scrollbar.getInsets();
    // double sy = (sbSize.height - sbInsets.top - sbInsets.bottom) / rect.getHeight();
    int itop = scrollbar.getInsets().top;
    BoundedRangeModel range = scrollbar.getModel();
    double sy = range.getExtent() / (double) (range.getMaximum() - range.getMinimum());
    AffineTransform at = AffineTransform.getScaleInstance(1.0, sy);
    Highlighter highlighter = textArea.getHighlighter();

    // paint Highlight
    g.setColor(Color.RED);
    try {
      for (Highlighter.Highlight hh: highlighter.getHighlights()) {
        Rectangle r = textArea.modelToView(hh.getStartOffset());
        Rectangle s = at.createTransformedShape(r).getBounds();
        int h = 2; // Math.max(2, s.height - 2);
        g.fillRect(x, y + itop + s.y, getIconWidth(), h);
      }
    } catch (BadLocationException e) {
      e.printStackTrace();
    }

    // paint Thumb
    if (scrollbar.isVisible()) {
      // JViewport vport = Objects.requireNonNull(
      //   (JViewport) SwingUtilities.getAncestorOfClass(JViewport.class, textArea));
      // Rectangle thumbRect = vport.getBounds();
      thumbRect.height = range.getExtent();
      thumbRect.y = range.getValue(); // vport.getViewPosition().y;
      g.setColor(THUMB_COLOR);
      Rectangle s = at.createTransformedShape(thumbRect).getBounds();
      g.fillRect(x, y + itop + s.y, getIconWidth(), s.height);
    }
  }

  @Override public int getIconWidth() {
    return 8;
  }

  @Override public int getIconHeight() {
    JViewport vport = Objects.requireNonNull(
      (JViewport) SwingUtilities.getAncestorOfClass(JViewport.class, textArea));
    return vport.getHeight();
  }
});

scroll.setVerticalScrollBar(scrollbar);
/*
// Fixed Versions: 7 (b134)
scroll.setRowHeaderView(label);
/*/
// 6826074 JScrollPane does not revalidate the component hierarchy after scrolling
// https://bugs.openjdk.org/browse/JDK-6826074
// Affected Versions: 6u12,6u16,7
JViewport vp = new JViewport() {
  @Override public void setViewPosition(Point p) {
    super.setViewPosition(p);
    revalidate();
  }
};
vp.setView(label);
scroll.setRowHeader(vp);

MatteBorder + Icon + RowHeader

Code

JScrollBar scrollBar = new JScrollBar(Adjustable.VERTICAL) {
  @Override public Dimension getPreferredSize() {
    Dimension d = super.getPreferredSize();
    d.width += getInsets().left;
    return d;
  }

  @Override public void updateUI() {
    super.updateUI();
    setBorder(BorderFactory.createMatteBorder(0, 4, 0, 0, new Icon() {
      @Override public void paintIcon(Component c, Graphics g, int x, int y) {
        // ...
      }

      @Override public int getIconWidth() {
        return getInsets().left;
      }

      @Override public int getIconHeight() {
        return getHeight();
      }
    }));
  }
};
scroll.setVerticalScrollBar(scrollBar);

References

JScrollBar search highlighter(Japanese)

Google Tag Manager

2025/03/31

Rounds all corners of a JTextComponent's selection highlight polygon and fills it with a translucent background color

Code

References

2019/11/29

Change the word selection behavior by double clicking the mouse in JTextArea

Code

References

2015/12/28

Copy on select for JTextArea

Code

References

2014/06/29

Merge the ReplaceEdit(remove and insertString edit) into a single CompoundEdit

Code

References

2013/01/28

JScrollBar search highlighter

Code

Override WindowsScrollBarUI#paintTrack(...)

JLabel + Icon + RowHeader

Code

MatteBorder + Icon + RowHeader

Code

References