Swing/TableCellRenderer のバックアップの現在との差分(No.8)

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TableColumnModel tcm = table.getColumnModel();
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tcm.getColumn(1).setCellRenderer(new TestRenderer());
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tcm.getColumn(2).setCellRenderer(new TextAreaCellRenderer());
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// ...
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class TextAreaCellRenderer extends JTextArea implements TableCellRenderer {
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  TextAreaCellRenderer() {
    super();
    setLineWrap(true);
  }

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#screenshot
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  @Override public Component getTableCellRendererComponent(
        JTable table, Object value, boolean isSelected, boolean hasFocus,
        int row, int column) {
    if (isSelected) {
      setForeground(table.getSelectionForeground());
      setBackground(table.getSelectionBackground());
    } else {
      setForeground(table.getForeground());
      setBackground(table.getBackground());
    }
    setText((value == null) ? "" : value.toString());
    return this;
  }
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}
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// ...
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class TestRenderer extends MyJLabel implements TableCellRenderer {
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  public TestRenderer() {
    super();
    setOpaque(true);
    setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 5));
  }

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**サンプルコード [#o9ff0afa]
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 class MyJLabel extends JLabel {
   private GlyphVector gvtext;
   public MyJLabel() {super();}
   protected void paintComponent(Graphics g) {
     //super.paintComponent(g);
     Graphics2D g2 = (Graphics2D)g;
     int WRAPPING_WIDTH = getWidth()-getInsets().left-getInsets().right;
     FontRenderContext frc = g2.getFontRenderContext();
     gvtext = getWrappedGlyphVector(getText(), WRAPPING_WIDTH, getFont(), frc);
     g2.setPaint(getBackground());
     g2.fillRect(0, 0, getWidth(), getHeight());
     g2.setPaint(getForeground());
     g2.drawGlyphVector(gvtext,
                        getInsets().left,
                        getFont().getSize()+getInsets().top);
   }
   private GlyphVector getWrappedGlyphVector(String str, float wrap,
                                 Font font, FontRenderContext frc) {
     Point2D gmPos    = new Point2D.Double(0.0d, 0.0d);
     GlyphVector gv   = font.createGlyphVector(frc, str);
     float lineheight = (float) (gv.getLogicalBounds().getHeight());
     float xpos       = 0.0f;
     float advance    = 0.0f;
     int   lineCount  = 0;
     GlyphMetrics gm;
     for(int i=0;i<gv.getNumGlyphs();i++) {
       gm = gv.getGlyphMetrics(i);
       advance = gm.getAdvance();
       if(xpos<wrap && wrap<=xpos+advance) {
         lineCount++;
         xpos = 0.0f;
       }
       gmPos.setLocation(xpos, lineheight*lineCount);
       gv.setGlyphPosition(i, gmPos);
       xpos = xpos + advance;
     }
     return gv;
   }
 }
 class TestRenderer extends MyJLabel implements TableCellRenderer{
   public TestRenderer() {
   <以下省略>
  @Override public Component getTableCellRendererComponent(
        JTable table, Object value, boolean isSelected, boolean hasFocus,
        int row, int column) {
    if (isSelected) {
      setForeground(table.getSelectionForeground());
      setBackground(table.getSelectionBackground());
    } else {
      setForeground(table.getForeground());
      setBackground(table.getBackground());
    }
    // setHorizontalAlignment((value instanceof Number) ? RIGHT : LEFT);
    setFont(table.getFont());
    setText((value == null) ? "" : value.toString());
    return this;
  }
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}
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-&jnlp;
-&jar;
-&zip;
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class MyJLabel extends JLabel {
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  private GlyphVector gvtext;
  public MyJLabel() {
    super();
  }

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**解説 [#od38b372]
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上記のサンプルでは、[[文字列の折り返し>Swing/GlyphVector]]で作成したラベルを継承するTableCellRendererを使って、セル幅に合わせて折り返しています。
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  @Override protected void paintComponent(Graphics g) {
    // super.paintComponent(g);
    Graphics2D g2 = (Graphics2D) g;
    // ...
    g2.drawGlyphVector(gvtext,
                       getInsets().left,
                       getFont().getSize()+getInsets().top);
  }
  // ...
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}
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