/*
 *                 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 1997-2003 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.modules.form.palette;

import java.awt.BorderLayout;
import java.awt.Dimension;

import org.openide.ErrorManager;
import org.openide.windows.TopComponent;
import org.openide.windows.WindowManager;
import org.openide.awt.UndoRedo;
import org.openide.util.Utilities;

/**
 * Top component which displays component palette.
 *
 * @author  Jan Rojcek
 */

public class PaletteTopComponent extends TopComponent {

    static final long serialVersionUID = 4248268998485315735L;

    private static PaletteTopComponent instance;

    /** Creates new PaletteTopComponent */
    private PaletteTopComponent() {
        setName(CPManager.getBundle().getString("CTL_Component_palette"));  // NOI18N
        setToolTipText(CPManager.getBundle().getString("HINT_PaletteComponent"));
        setIcon(Utilities.loadImage("org/netbeans/modules/form/resources/palette.png")); // NOI18N
    }

    public void addNotify() {
        // XXX(-ttran) this is optimization for startup performance of the IDE.
        // It would not be needed if there was not the performance bug
        // #18039 in the window system.  Once that bug is fixed we can move this
        // piece of code back to the constructor where it should be
        
        setLayout(new BorderLayout());
        setPreferredSize(new Dimension(505, 88));
        add(CPManager.getDefault().getPalette());

        super.addNotify();
    }
    
    public boolean requestFocusInWindow() {
        super.requestFocusInWindow();
        return CPManager.getDefault().getPalette().requestFocusInWindow();
    }

    /** Gets default instance. Don't use directly, it reserved for '.settings' file only,
     * i.e. deserialization routines, otherwise you can get non-deserialized instance. */
    public static synchronized PaletteTopComponent getDefault() {
        if(instance == null) {
            instance = new PaletteTopComponent();
        }
        return instance;
    }
    
    /** Finds default instance. Use in client code instead of {@link #getDefault()}. */
    public static synchronized PaletteTopComponent getInstance() {
        if(instance == null) {
            TopComponent tc = WindowManager.getDefault().findTopComponent("ComponentPalette"); // NOI18N
            if(instance == null) {
                ErrorManager.getDefault().notify(ErrorManager.INFORMATIONAL, new IllegalStateException(
                    "Can not find ComponentPalette component for its ID. Returned " + tc)); // NOI18N
                instance = new PaletteTopComponent();
            }
        }
        
        return instance;
    }
    
    /** Overriden to explicitely set persistence type of PaletteTopComponent
     * to PERSISTENCE_ALWAYS */
    public int getPersistenceType() {
        return TopComponent.PERSISTENCE_ALWAYS;
    }
    
    protected void componentClose() {
        // palette is closed so set mode of designer to selection
        CPManager.getDefault().setSelectedItem(null);
    }

    public UndoRedo getUndoRedo() {
        return org.netbeans.modules.form.ComponentInspector.getInstance().getUndoRedo();
    }

//    public void requestFocus() {
//        super.requestFocus();
//        if (CPManager.getDefault().getComponent() != null)
//            CPManager.getDefault().getComponent().requestFocus();
//    }

    /** replaces this in object stream */
    public Object writeReplace() {
        return new ResolvableHelper();
    }
    
    protected String preferredID() {
        return getClass().getName();
    }
    
    final public static class ResolvableHelper implements java.io.Serializable {
        static final long serialVersionUID = 7424646018839457793L;
        public Object readResolve() {
            return PaletteTopComponent.getDefault();
        }
    }
}