defaultcelleditor.java

来自「linux下建立JAVA虚拟机的源码KAFFE」· Java 代码 · 共 554 行 · 第 1/2 页

      return value = f.getText();      
    }     
  }

  /**
   * Provides getter and setter methods to work with the combo box.
   * 
   * @author Audrius Meskauskas ([e-mail]) 
   */
  private class JComboBoxDelegate extends EditorDelegate
  {
    /**
     * Use the serial version UID for interoperability.
     */
    private static final long serialVersionUID = 1;
    
    /**
     * Set the value for the editor component.
     *
     * @param aValue the value to set.
     */
    public void setValue(Object aValue)
    {
      value = aValue;      
      JComboBox c = (JComboBox) editorComponent;
      if (value != null)
        c.setSelectedItem(value);
    }

    /**
     * Get the value for the editor component. 
     *
     * @return value the value of the component (as String)
     */
    public Object getCellEditorValue()
    {
      JComboBox c = (JComboBox) editorComponent;
      return value = c.getSelectedItem();
    }     
  }

  /**
   * Provides getter and setter methods to work with the check box.
   * 
   * @author Audrius Meskauskas ([e-mail]) 
   */
  private class JCheckBoxDelegate extends EditorDelegate
  {
    /**
     * Use the serial version UID for interoperability.
     */
    private static final long serialVersionUID = 1;
    
    /**
     * Set the value for the editor component.
     *
     * @param value the value to set (must be Boolean).
     */
    public void setValue(Object value)
    {
      JCheckBox c = (JCheckBox) editorComponent;
      
      if (value == null)
        c.setSelected(false);
      else
        c.setSelected( ((Boolean) value).booleanValue());
    }

    /**
     * Get the value for the editor component. 
     *
     * @return value the value of the component (must be CharSequence)
     */
    public Object getCellEditorValue()
    {
      JCheckBox c = (JCheckBox) editorComponent;
      value = c.isSelected() ? Boolean.TRUE : Boolean.FALSE;
      return value;
    }     
  }
  
  /**
   * The Swing JComponent, performing the editing session.
   */
  protected JComponent editorComponent;

  /**
   * The editor delegate, responsible for listening the {@link #editorComponent}
   * events and getting/setting its value.
   */
  protected EditorDelegate delegate;

  /**
   * The number of the mouse clicks, required to start the editing session.
   */
  protected int clickCountToStart;

  /**
   * Create the DefaultCellEditor that uses the text field as its editor
   * component (appropriate for the text content)
   * 
   * @param textfield the text field as will be used as the editor component
   */
  public DefaultCellEditor(JTextField textfield)
  {
    editorComponent = textfield;
    clickCountToStart = 2;
    delegate = new JTextFieldDelegate();
    textfield.addActionListener(delegate);
  } // DefaultCellEditor()

  /**
   * Constructor DefaultCellEditor that uses the checkbox (appropriate
   * for boolean values)
   * 
   * @param checkbox the checkbox that will be used with this editor.
   */
  public DefaultCellEditor(JCheckBox checkbox)
  {
    editorComponent = checkbox;
    clickCountToStart = 1;
    delegate = new JCheckBoxDelegate();
    checkbox.addActionListener(delegate);
  } // DefaultCellEditor()

  /**
   * Constructor DefaultCellEditor that uses the combo box.
   * 
   * @param combobox the combo box that will be used with this editor.
   */
  public DefaultCellEditor(JComboBox combobox)
  {
    editorComponent = combobox;
    clickCountToStart = 1;
    delegate = new JComboBoxDelegate();
    combobox.addActionListener(delegate);
  } // DefaultCellEditor()

  /**
   * Get the component that performs the editing sessions. It is the same 
   * component that was passed in constructor.
   * 
   * @return the component, performing the editing sessions. 
   */
  public Component getComponent()
  {
    return editorComponent; 
  } // getComponent()

  /**
   * Get the number of mouse clicks, required to start the editing session.
   * 
   * @return int the number of mouse clicks, required to start the session
   */
  public int getClickCountToStart()
  {
    return clickCountToStart;
  } // getClickCountToStart()

  /**
   * Set the number of mouse clicks, required to start the editing session.
   * 
   * @param count the number of clicks, required to start the session
   */
  public void setClickCountToStart(int count)
  {
    clickCountToStart = count;
  } // setClickCountToStart()

  /**
   * Get the value, currently being displayed by the editor component. The 
   * call is forwarded to the {@link #delegate}.
   * 
   * @return Object the value (class depends on the editor component)
   */
  public Object getCellEditorValue()
  {
    return delegate.getCellEditorValue();
  } // getCellEditorValue()

  /**
   * Forwards call to the {@link #delegate}.
   * 
   * @param event forwarded to the delegate.
   *
   * @return boolean returned by delegate
   */
  public boolean isCellEditable(EventObject event)
  {
    return delegate.isCellEditable(event);
  } // isCellEditable()

  /**
   * Forwards call to the {@link #delegate}.
   * 
   * @param event forwarded to the delegate.
   *
   * @return boolean returned by delegate
   */
  public boolean shouldSelectCell(EventObject event)
  {
    return delegate.shouldSelectCell(event);
  } // shouldSelectCell()

  /**
   * Forwards call to the {@link #delegate}.
   * 
   * @return boolean returned by delegate
   */
  public boolean stopCellEditing()
  {
    return delegate.stopCellEditing();
  } // stopCellEditing()

  /**
   * Forwards call to the {@link #delegate}.
   */
  public void cancelCellEditing()
  {
    delegate.cancelCellEditing();
  } // cancelCellEditing()

  /**
   * Sets an initial value for the editor. 
   * This will cause the editor to stopEditing and lose any partially 
   * edited value if the editor is editing when this method is called.
   * Returns the component that should be added to the client's Component 
   * hierarchy. Once installed in the client's hierarchy this component will 
   * then be able to draw and receive user input. 
   * 
   * @param tree - the JTree that is asking the editor to edit; this 
   * parameter can be null
   * @param value - the value of the cell to be edited
   * @param isSelected - true is the cell is to be renderer with selection
   * highlighting
   * @param expanded - true if the node is expanded
   * @param leaf - true if the node is a leaf node
   * @param row - the row index of the node being edited
   *
   * @return Component the component for editing
   */
  public Component getTreeCellEditorComponent(JTree tree, Object value,
                                              boolean isSelected,
                                              boolean expanded, boolean leaf,
                                              int row)
  {
    delegate.setValue(value);
    return editorComponent;
  } // getTreeCellEditorComponent()

  /**
   * Get the cell editor component that will perform the editing session. If
   * returned once, the same component is also returned on the repetetive calls
   * again (reused).
   * 
   * @param table the table where the editing is performed
   * @param value the current value of the table. It is set as the initial 
   *        component value.
   * @param isSelected if true, the cell is currently selected
   * @param row the row of the cell being edited
   * @param column the column of the cell being edited
   * 
   * @return Component the component that will perform the editing session
   */
  public Component getTableCellEditorComponent(JTable table, Object value,
                                               boolean isSelected, int row,
                                               int column)
  {
    // NOTE: as specified by Sun, we don't call new() everytime, we return 
    // editorComponent on each call to getTableCellEditorComponent or
    // getTreeCellEditorComponent.
    delegate.setValue(value);
    return editorComponent;
  } // getTableCellEditorComponent()

}