/*
 *                 Sun Public License Notice
 * 
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 * 
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2002 Sun
 * Microsystems, Inc. All Rights Reserved.
 */
package org.netbeans.modules.xml.tree.editor;

import java.io.*;
import java.beans.*;
import javax.swing.*;
import javax.swing.border.*;

import org.openide.explorer.*;
import org.openide.nodes.Node;
import org.netbeans.modules.xml.tree.nodes.ElementNode;

/** Explorer view displaying a customizer for selected node (if the node provides one) or textual label telling
 * that there is no customizer available or that there are no/multiple components selected.
 *
 * @author Ian Formanek, Libor Kramolis
 */
public class CustomizerView extends JPanel implements Externalizable {
    
    /** generated Serialized Version UID */
    private static final long serialVersionUID = -2922109093973271414L;
    
    /** The current selectedNodes */
    transient private Node[] selectedNodes;
    /** The local reference to the explorerManager. It is transient
     * because it will be reset in initializeManager() after deserialization.*/
    transient private ExplorerManager explorerManager;
    /** Listens on ExplorerManager. */
    transient private PropertyIL iListener;
    
    /** Currently displayed component. */
    transient private java.awt.Component currentComponent;
    /** Label for notification in case when the customizer cannot be displayed. */
    transient private JLabel textLabel;
    
    
    // init .................................................................................
    
    /** Default constructor. */
    public CustomizerView() {
        super ();
        setLayout(new java.awt.BorderLayout());
        textLabel = new JLabel(Util.THIS.getString("PROP_viewNoNode"), SwingConstants.CENTER);
        currentComponent = textLabel;
        selectedNodes = new Node[0];
        iListener = new PropertyIL();
        updateSelection();
    }
    
    /*
     * Write view's state to output stream.
     */
    public void writeExternal(ObjectOutput out) throws IOException {
    }
    
    /*
     * Reads view's state form output stream.
     */
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
    }
    
    
    // main methods .........................................................................
    
    /* Initializes view.
     */
    public void addNotify() {
        super.addNotify();
        explorerManager = ExplorerManager.find(this);
        explorerManager.addPropertyChangeListener(iListener);
        
        //show initial customizer
        selectedNodes = explorerManager.getSelectedNodes();
        updateSelection();
    }
    
    /* Deinitializes view.
     */
    public void removeNotify() {
        super.removeNotify();
        explorerManager = ExplorerManager.find(this);
        explorerManager.removePropertyChangeListener(iListener);
        explorerManager = null;
    }
    
    private void updateSelection() {
        remove(currentComponent);
        if (selectedNodes.length == 0) {
            textLabel.setText(Util.THIS.getString("PROP_viewNoNode"));
            textLabel.setName(Util.THIS.getString("PROP_viewInfo"));
            currentComponent = textLabel;
        } else if (selectedNodes.length > 1) {
            textLabel.setText(Util.THIS.getString("PROP_viewMultiple"));
            textLabel.setName(Util.THIS.getString("PROP_viewInfo"));
            currentComponent = textLabel;
        } else {
            selectedNodes[0].addPropertyChangeListener(iListener);
            java.awt.Component customizer = selectedNodes[0].getCustomizer();
            if (customizer == null) {
                textLabel.setText(Util.THIS.getString("PROP_viewNoCustomizer"));
                textLabel.setName(Util.THIS.getString("PROP_viewInfo"));
                currentComponent = textLabel;
            } else {
                // add bottom margin 
                JPanel customizerPanel = new JPanel();
                customizerPanel.setLayout(new java.awt.GridBagLayout());
                java.awt.GridBagConstraints gbc = new java.awt.GridBagConstraints();
                gbc.gridx = 0;
                gbc.gridy = 0;
                gbc.gridwidth = java.awt.GridBagConstraints.REMAINDER;
                gbc.gridheight = java.awt.GridBagConstraints.REMAINDER;
                gbc.fill = java.awt.GridBagConstraints.BOTH;
                gbc.insets = new java.awt.Insets(0, 0, 11, 0);
                gbc.weightx = 1.0;               
                gbc.weighty = 1.0;
                gbc.anchor = java.awt.GridBagConstraints.NORTHWEST;
                customizerPanel.add(customizer, gbc);
                
                currentComponent = new JScrollPane(customizerPanel);
            }
        }
        
        add(currentComponent, java.awt.BorderLayout.CENTER);
        validate();
        repaint();
    }
    
    // innerclasses .........................................................................
    
    /* The inner adaptor class for listening to the ExplorerManager's property changes. */
    class PropertyIL implements PropertyChangeListener {
        public void propertyChange(PropertyChangeEvent evt) {
            if (ExplorerManager.PROP_SELECTED_NODES.equals(evt.getPropertyName())) {
                if (selectedNodes.equals(evt.getNewValue())) {
                    return;
                }
                if( selectedNodes.length == 1 )
                { 
                    selectedNodes[0].removePropertyChangeListener(this);
                } 

                selectedNodes = (Node[])evt.getNewValue();
                updateSelection();
            }
            else if( ElementNode.PROP_CUSTOMIZER.equals(evt.getPropertyName()) )
            { 
                // the tag name has changed, and the customizer needs to be redrawn
                updateSelection();
            } 
        }
    }
    
}