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TITLE:JListのセルにJCheckBoxを使用する
#navi(../)
#tags(JList, JCheckBox, ListCellRenderer, MouseListener, JTree, Box)
RIGHT:Posted by &author(aterai); at 2011-03-28
* JListのセルにJCheckBoxを使用する [#z6df133e]
`JList`のセルに`JCheckBox`を使用して、チェックボックスの一覧を作成します。

#download
#ref(https://lh3.googleusercontent.com/-EfbwsqycTvg/UlyukvM4ivI/AAAAAAAAB3o/NJBvrfM4xPA/s800/CheckBoxCellList.png)

** サンプルコード [#hbcc9907]
#code(link){{
class CheckBoxCellRenderer extends JCheckBox
    implements ListCellRenderer, MouseListener, MouseMotionListener {
class CheckBoxCellRenderer<E extends CheckBoxNode> extends JCheckBox
          implements ListCellRenderer<E>, MouseListener, MouseMotionListener {
  private int rollOverRowIndex = -1;
  @Override public Component getListCellRendererComponent(
    JList list,
    Object value,
    int index,
    boolean isSelected,
    boolean cellHasFocus) {
      JList<? extends E> list, E value, int index, boolean isSelected, boolean cellHasFocus) {
    this.setOpaque(true);
    if(isSelected) {
      this.setBackground(list.getSelectionBackground());
      this.setForeground(list.getSelectionForeground());
    }else{
      this.setBackground(list.getBackground());
      this.setForeground(list.getForeground());
    }
    if(value instanceof CheckBoxNode) {
      this.setSelected(((CheckBoxNode)value).selected);
      this.getModel().setRollover(index==rollOverRowIndex);
    }
    this.setText(value.toString());
    this.setSelected(value.selected);
    this.getModel().setRollover(index==rollOverRowIndex);
    this.setText(value.text);
    return this;
  }
  private int rollOverRowIndex = -1;
  @Override public void mouseExited(MouseEvent e) {
    JList l = (JList)e.getSource();
    if(rollOverRowIndex>=0) {
      JList l = (JList)e.getComponent();
      l.repaint(l.getCellBounds(rollOverRowIndex, rollOverRowIndex));
      rollOverRowIndex = -1;
    }
  }
  @SuppressWarnings("unchecked")
  @Override public void mouseClicked(MouseEvent e) {
    if(e.getButton()==MouseEvent.BUTTON1) {
      JList l = (JList)e.getComponent();
      DefaultListModel m = (DefaultListModel)l.getModel();
      Point p = e.getPoint();
      int index  = l.locationToIndex(p);
      if(index>=0) {
        CheckBoxNode n = (CheckBoxNode)m.get(index);
        @SuppressWarnings("unchecked")
        DefaultListModel<CheckBoxNode> m = (DefaultListModel<CheckBoxNode>)l.getModel();
        CheckBoxNode n = m.get(index);
        m.set(index, new CheckBoxNode(n.text, !n.selected));
        l.repaint(l.getCellBounds(index, index));
      }
    }
  }
  @Override public void mouseMoved(MouseEvent e) {
    JList l = (JList)e.getSource();
    JList l = (JList)e.getComponent();
    int index = l.locationToIndex(e.getPoint());
    if(index != rollOverRowIndex) {
      rollOverRowIndex = index;
      l.repaint();
    }
  }
  @Override public void mouseEntered(MouseEvent e) {}
  @Override public void mousePressed(MouseEvent e) {}
  @Override public void mouseReleased(MouseEvent e) {}
  @Override public void mouseDragged(MouseEvent e) {}
  @Override public void mouseEntered(MouseEvent e)  { /* not needed */ }
  @Override public void mousePressed(MouseEvent e)  { /* not needed */ }
  @Override public void mouseReleased(MouseEvent e) { /* not needed */ }
  @Override public void mouseDragged(MouseEvent e)  { /* not needed */ }
}
}}

** 解説 [#u07c22e4]
- 左: `Box`
-- `Box.createVerticalBox()`に`JCheckBox`を追加
-- `JCheckBox#setAlignmentX(Component.LEFT_ALIGNMENT);`で左揃えに設定

- 中: `JList`
-- `JCheckBox`を継承する`ListCellRenderer`を設定
-- チェックボックスのロールオーバーなどは、`JList`にマウスリスナーを設定して表示
-- `JList#processMouseEvent`、`JList#processMouseMotionEvent`のオーバーライドと、`JList#putClientProperty("List.isFileList", Boolean.TRUE);`で、クリックが有効になる領域をチェックボックスの幅に制限

#code{{
JList list1 = new JList(model) {
  private CheckBoxCellRenderer renderer;
  @Override public void updateUI() {
    setForeground(null);
    setBackground(null);
    setSelectionForeground(null);
    setSelectionBackground(null);
    if(renderer!=null) {
      removeMouseListener(renderer);
      removeMouseMotionListener(renderer);
    }
    super.updateUI();
    renderer = new CheckBoxCellRenderer();
    setCellRenderer(renderer);
    addMouseListener(renderer);
    addMouseMotionListener(renderer);
  }
  //@see SwingUtilities2.pointOutsidePrefSize(...)
  private boolean pointOutsidePrefSize(Point p) {
    int index = locationToIndex(p);
    DefaultListModel m = (DefaultListModel)getModel();
    CheckBoxNode n = (CheckBoxNode)m.get(index);
    Component c = getCellRenderer().getListCellRendererComponent(
        this, n, index, false, false);
    //c.doLayout();
    Dimension d = c.getPreferredSize();
    Rectangle rect = getCellBounds(index, index);
    rect.width = d.width;
    return index < 0 || !rect.contains(p);
  }
  @Override protected void processMouseEvent(MouseEvent e) {
    if(!pointOutsidePrefSize(e.getPoint())) {
      super.processMouseEvent(e);
    }
  }
  @Override protected void processMouseMotionEvent(MouseEvent e) {
    if(!pointOutsidePrefSize(e.getPoint())) {
      super.processMouseMotionEvent(e);
    }else{
      e = new MouseEvent(
          (Component)e.getSource(), MouseEvent.MOUSE_EXITED, e.getWhen(),
          e.getModifiers(), e.getX(), e.getY(),
          e.getXOnScreen(), e.getYOnScreen(),
          e.getClickCount(), e.isPopupTrigger(), MouseEvent.NOBUTTON);
      super.processMouseEvent(e);
    }
  }
};
}}

- 右: `JTree`
-- `JCheckBox`を継承する`TreeCellRenderer`を設定
--- [[JTreeの葉ノードをJCheckBoxにする>Swing/CheckBoxNodeTree]]のセルレンダラーを使用
-- `JTree#setRootVisible(false)`でルートノードを非表示に設定

#code{{
class CheckBoxNodeRenderer extends JCheckBox implements TreeCellRenderer {
  private TreeCellRenderer renderer = new DefaultTreeCellRenderer();
  @Override public Component getTreeCellRendererComponent(
      JTree tree, Object value, boolean selected, boolean expanded,
      boolean leaf, int row, boolean hasFocus) {
    if(leaf && value != null && value instanceof DefaultMutableTreeNode) {
      this.setOpaque(false);
      Object userObject = ((DefaultMutableTreeNode)value).getUserObject();
      if(userObject!=null && userObject instanceof CheckBoxNode) {
        CheckBoxNode node = (CheckBoxNode)userObject;
        this.setText(node.text);
        this.setSelected(node.selected);
      }
      return this;
    }
    return renderer.getTreeCellRendererComponent(
        tree, value, selected, expanded, leaf, row, hasFocus);
  }
}

class CheckBoxNodeEditor extends JCheckBox implements TreeCellEditor {
  private final JTree tree;
  public CheckBoxNodeEditor(JTree tree) {
    super();
    this.tree = tree;
    setOpaque(false);
    setFocusable(false);
    addActionListener(new ActionListener() {
      @Override public void actionPerformed(ActionEvent e) {
        stopCellEditing();
      }
    });
  }
  @Override public Component getTreeCellEditorComponent(
      JTree tree, Object value, boolean isSelected, boolean expanded,
      boolean leaf, int row) {
    if(leaf && value != null && value instanceof DefaultMutableTreeNode) {
      Object userObject = ((DefaultMutableTreeNode)value).getUserObject();
      if(userObject!=null && userObject instanceof CheckBoxNode) {
        this.setSelected(((CheckBoxNode)userObject).selected);
      } else {
        this.setSelected(false);
      }
      this.setText(value.toString());
    }
    return this;
  }
  @Override public Object getCellEditorValue() {
    return new CheckBoxNode(getText(), isSelected());
  }
  @Override public boolean isCellEditable(EventObject e) {
    return (e != null && e instanceof MouseEvent);
  }
  //Copid from AbstractCellEditor
  //protected EventListenerList listenerList = new EventListenerList();
  //transient protected ChangeEvent changeEvent = null;
  @Override public boolean shouldSelectCell(java.util.EventObject anEvent) {
//...
}}

**参考リンク [#s9192898]
- [[JTreeの葉ノードをJCheckBoxにする>Swing/CheckBoxNodeTree]]

** コメント [#d0ea5ae4]
- 補足として追記していた`JTree`を使用するサンプルを本体に取り込んで、スクリーンショットなどを更新。 -- [[aterai]] &new{2013-10-15 (火) 11:56:41};
- %%スパム対策でコメント欄を停止。%% `.htaccess`で対応するように変更。 -- [[aterai]] &new{2013-10-21 (月) 15:03:42};

#comment