/*
 * @(#)BasicEditorPaneUI.java	1.24 00/04/06
 *
 * Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */
package javax.swing.plaf.basic;

import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.net.URL;
import java.net.MalformedURLException;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.plaf.*;
import javax.swing.border.*;


/**
 * Provides the look and feel for a JEditorPane.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with 
 * future Swing releases.  The current serialization support is appropriate
 * for short term storage or RMI between applications running the same
 * version of Swing.  A future release of Swing will provide support for
 * long term persistence.
 *
 * @author  Timothy Prinzing
 * @version 1.24 04/06/00
 */
public class BasicEditorPaneUI extends BasicTextUI {

    /**
     * Creates a UI for the JTextPane.
     *
     * @param c the JTextPane component
     * @return the UI
     */
    public static ComponentUI createUI(JComponent c) {
        return new BasicEditorPaneUI();
    }

    /**
     * Creates a new BasicEditorPaneUI.
     */
    public BasicEditorPaneUI() {
	super();
    }

    protected void installKeyboardActions() {
	super.installKeyboardActions();
	EditorKit editorKit = getEditorKit(getComponent());
	if (editorKit != null) {
	    Action[] actions = editorKit.getActions();
	    if (actions != null) {
		addActions(getComponent().getActionMap(), actions);
	    }
	}
    }

    /**
     * Fetches the name used as a key to lookup properties through the
     * UIManager.  This is used as a prefix to all the standard
     * text properties.
     *
     * @return the name ("EditorPane")
     */
    protected String getPropertyPrefix() {
	return "EditorPane";
    }

    /**
     * Fetches the EditorKit for the UI.  This is whatever is
     * currently set in the associated JEditorPane.
     *
     * @return the editor capabilities
     * @see TextUI#getEditorKit
     */
    public EditorKit getEditorKit(JTextComponent tc) {
	JEditorPane pane = (JEditorPane) getComponent();
	return pane.getEditorKit();
    }

    /**
     * Fetch an action map to use.  The map for a JEditorPane
     * is not shared because it changes with the EditorKit.
     */
    ActionMap getActionMap() {
        ActionMap am = new ActionMapUIResource();
        am.put("requestFocus", new FocusAction());
	return am;
    }

    /**
     * This method gets called when a bound property is changed
     * on the associated JTextComponent.  This is a hook
     * which UI implementations may change to reflect how the
     * UI displays bound properties of JTextComponent subclasses.
     * This is implemented to rebuild the ActionMap based upon an
     * EditorKit change.
     *
     * @param evt the property change event
     */
    protected void propertyChange(PropertyChangeEvent evt) {
	if (evt.getPropertyName().equals("editorKit")) {
	    ActionMap map = getComponent().getActionMap();
	    if (map != null) {
		Object oldValue = evt.getOldValue();
		if (oldValue instanceof EditorKit) {
		    Action[] actions = ((EditorKit)oldValue).getActions();
		    if (actions != null) {
			removeActions(map, actions);
		    }
		}
		Object newValue = evt.getNewValue();
		if (newValue instanceof EditorKit) {
		    Action[] actions = ((EditorKit)newValue).getActions();
		    if (actions != null) {
			addActions(map, actions);
		    }
		}
	    }
	}
    }

    void removeActions(ActionMap map, Action[] actions) {
	int n = actions.length;
	for (int i = 0; i < n; i++) {
	    Action a = actions[i];
	    map.remove(a.getValue(Action.NAME));
	}
    }

    void addActions(ActionMap map, Action[] actions) {
	int n = actions.length;
	for (int i = 0; i < n; i++) {
	    Action a = actions[i];
	    map.put(a.getValue(Action.NAME), a);
	}
    }

}