Swing/OverTypeMode のバックアップの現在との差分(No.3)

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// Paint a horizontal line the width of a column and 1 pixel high
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class OvertypeCaret extends DefaultCaret {
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  // The overtype caret will simply be a horizontal line
  // one pixel high (once we determine where to paint it)
  @Override public void paint(Graphics g) {
    if (isVisible()) {
      try {
        JTextComponent component = getComponent();
        TextUI mapper = component.getUI();
        Rectangle r = mapper.modelToView(component, getDot());
        g.setColor(component.getCaretColor());
        int width = g.getFontMetrics().charWidth('w');
        // 全角などに対応
        if (isOvertypeMode()) {
          int pos = getCaretPosition();
          if (pos < getDocument().getLength()) {
            if (getSelectedText() != null) {
              width = 0;
            } else {
              String str = getText(pos, 1);
              width = g.getFontMetrics().stringWidth(str);
            }
          }
        } // ここまで追加
        int y = r.y + r.height - 2;
        g.drawLine(r.x, y, r.x + width - 2, y);
      } catch (BadLocationException e) {}
    }
  }

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http://terai.xrea.jp/swing/overtypemode/screenshot.png
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**サンプルコード [#hf545cfe]
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 // Paint a horizontal line the width of a column and 1 pixel high
 class OvertypeCaret extends DefaultCaret {
   //The overtype caret will simply be a horizontal line
   //one pixel high (once we determine where to paint it)
   public void paint(Graphics g) {
     if(isVisible()) {
       try{
         JTextComponent component = getComponent();
         TextUI mapper = component.getUI();
         Rectangle r = mapper.modelToView(component, getDot());
         g.setColor(component.getCaretColor());
         int width = g.getFontMetrics().charWidth('w');
         //全角などに対応
         if(isOvertypeMode()) {
           int pos = getCaretPosition();
           if(pos<getDocument().getLength()) {
             if(getSelectedText()!=null) {
               width = 0;
             }else{
               String str = getText(pos, 1);
               width = g.getFontMetrics().stringWidth(str);
             }
           }
         } //ここまで追加
         int y = r.y + r.height - 2;
         g.drawLine(r.x, y, r.x + width - 2, y);
       }catch(BadLocationException e) {}
     }
   }
   // Damage must be overridden whenever the paint method is overridden
   // (The damaged area is the area the caret is painted in. We must
   // consider the area for the default caret and this caret)
   protected synchronized void damage(Rectangle r) {
     if(r != null) {
       JTextComponent c = getComponent();
       x = r.x;
       y = r.y;
       //width = c.getFontMetrics(c.getFont()).charWidth('w');
       //全角対応
       width = c.getFontMetrics(c.getFont()).charWidth('あ');
       height = r.height;
       repaint();
     }
   }
 }
  // Damage must be overridden whenever the paint method is overridden
  // (The damaged area is the area the caret is painted in. We must
  // consider the area for the default caret and this caret)
  @Override protected synchronized void damage(Rectangle r) {
    if (r != null) {
      JTextComponent c = getComponent();
      x = r.x;
      y = r.y;
      // width = c.getFontMetrics(c.getFont()).charWidth('w');
      // 全角対応
      width = c.getFontMetrics(c.getFont()).charWidth('あ');
      height = r.height;
      repaint();
    }
  }
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}
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