abstractcelleditor.java

《Java2图形设计卷II：Swing》配套光盘源码

import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import javax.swing.tree.*;
import java.awt.event.MouseEvent;
import java.util.EventObject;

public class AbstractCellEditor 
				implements TableCellEditor, TreeCellEditor {
    protected EventListenerList listenerList = 
										new EventListenerList();
	protected Object value;
    protected ChangeEvent changeEvent = null;
    protected int clickCountToStart = 1;

	public Object getCellEditorValue() {
		return value;
	}
	public void setCellEditorValue(Object value) {
		this.value = value;
	}
    public void setClickCountToStart(int count) {
		clickCountToStart = count;
    }
    public int getClickCountToStart() {
		return clickCountToStart;
    }
    public boolean isCellEditable(EventObject anEvent) {
		if (anEvent instanceof MouseEvent) {
	    	if (((MouseEvent)anEvent).getClickCount() < 
												clickCountToStart)
			return false;
		}
		return true;
    }
    public boolean shouldSelectCell(EventObject anEvent) {
		if (this.isCellEditable(anEvent)) {
	    	if (anEvent == null || 
				((MouseEvent)anEvent).getClickCount() >= 
												clickCountToStart)
				return true;
		}
		return false;
	}
    public boolean stopCellEditing() {
		fireEditingStopped();
		return true;
    }
    public void cancelCellEditing() {
		fireEditingCanceled();
    }
    public void addCellEditorListener(CellEditorListener l) {
		listenerList.add(CellEditorListener.class, l);
    }
    public void removeCellEditorListener(CellEditorListener l) {
		listenerList.remove(CellEditorListener.class, l);
    }
    public Component getTreeCellEditorComponent(
									JTree tree, Object value,
						boolean isSelected,
						boolean expanded,
						boolean leaf, int row) {
		return null;
    }
    public Component getTableCellEditorComponent(
									JTable table, Object value,
						 boolean isSelected,
						 int row, int column) {
		return null;
    }
    protected void fireEditingStopped() {
		Object[] listeners = listenerList.getListenerList();

		for (int i = listeners.length-2; i>=0; i-=2) {
		    if (listeners[i]==CellEditorListener.class) {
				if (changeEvent == null)
		    		changeEvent = new ChangeEvent(this);

				((CellEditorListener)
					listeners[i+1]).editingStopped(changeEvent);
	    	}	       
		}
    }
    protected void fireEditingCanceled() {
		Object[] listeners = listenerList.getListenerList();

		for (int i = listeners.length-2; i>=0; i-=2) {
		    if (listeners[i]==CellEditorListener.class) {
				if (changeEvent == null)
		    		changeEvent = new ChangeEvent(this);

			((CellEditorListener)
					listeners[i+1]).editingCanceled(changeEvent);
		    }	       
		}
    }
}