Chip 1998 November/Chip_1998-11_cd.bin/tema/Cafe/jfc.bin/ActivationHelper.java

Text File | 1998-02-26 | 5KB | 179 lines

/*
 * @(#)ActivationHelper.java    1.3 98/02/02
 *
 * Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
 *
 * This software is the confidential and proprietary information of Sun
 * Microsystems, Inc. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Sun.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
 * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 *
 */

package com.sun.java.swing.plaf.mac;

import java.awt.*;
import com.sun.java.swing.*;
import com.sun.java.swing.plaf.*;

/**
 * @version @(#)ActivationHelper.java    1.0 1/21/98
 * @author Symantec
 * @author Levi Brown
 * @author Craig Conner
 */

class ActivationHelper extends JComponent
{
    protected Window                parentWindow;
    protected MacAncestorListener    ancestorListener;
    protected boolean                activated;
    protected JComponent            c;

    public ActivationHelper()
    {
        parentWindow    = null;
        activated        = false;
        c                = null;

        //set up listener so we know when addNotify and removeNotify are called
        ancestorListener = new MacAncestorListener();
    }

    public ActivationHelper(JComponent c)
    {
        this();
        setComponent(c);
    }

    public void finalize()
    {
        setComponent(null);
    }

    public void setComponent(JComponent c)
    {
        if(this.c != null)
        {
            this.c.removeAncestorListener(ancestorListener);
        }

        this.c = c;

        if(this.c != null)
        {
            this.c.addAncestorListener(ancestorListener);
        }
    }

    public JComponent getComponent()
    {
        return c;
    }

    public boolean isActivated()
    {
        return activated;
    }

    protected void setActivated(boolean activated)
    {
        boolean oldValue = this.activated;

        this.activated = activated;

        firePropertyChange("activated", oldValue, activated);
    }

    class MacAncestorListener implements com.sun.java.swing.event.AncestorListener
    {
        MacWindowAdapter macWindowAdapter;

        /**
         * Called when the source or one of its ancestors is made visible
         * either by setVisible(true) being called or by its being
         * added to the component hierarchy.  The method is only called
         * if the source has actually become visible.  For this to be true
         * all its parents must be visible and it must be in a hierarchy
         * rooted at a Window
         */
        public void ancestorAdded(com.sun.java.swing.event.AncestorEvent event)
        {
            Component parent = null;
            int hHeight = 0, vWidth = 0;

            Object object = event.getSource();
            if(object == c )
                 parent = c.getParent();

                while((parent != null) && (!(parent instanceof Window)))
                    parent = parent.getParent();


            if(parent != null)
            {
                parentWindow = (Window)parent;

                macWindowAdapter = new MacWindowAdapter();
                parentWindow.addWindowListener(macWindowAdapter);
            }
        }

        /**
         * Called when the source or one of its ancestors is made invisible
         * either by setVisible(false) being called or by its being
         * remove from the component hierarchy.  The method is only called
         * if the source has actually become invisible.  For this to be true
         * at least one of its parents must by invisible or it is not in
         * a hierarchy rooted at a Window
         */
        public void ancestorRemoved(com.sun.java.swing.event.AncestorEvent event)
        {
            if(parentWindow != null)
                parentWindow.removeWindowListener(macWindowAdapter);
        }

        /**
         * Called when either the source or one of its ancestors is moved.
         */
        public void ancestorMoved(com.sun.java.swing.event.AncestorEvent event)
        {
        }
    }

    class MacWindowAdapter extends java.awt.event.WindowAdapter
    {
        public void windowDeactivated(java.awt.event.WindowEvent event)
        {
            Object object = event.getSource();
            if (object == parentWindow)
                ParentWindow_WindowDeactivated(event);
        }

        public void windowActivated(java.awt.event.WindowEvent event)
        {
            Object object = event.getSource();
            if (object == parentWindow)
                ParentWindow_WindowActivated(event);
        }
    }

    void ParentWindow_WindowActivated(java.awt.event.WindowEvent event)
    {
        setActivated(true);
    }

    void ParentWindow_WindowDeactivated(java.awt.event.WindowEvent event)
    {
        setActivated(false);
    }
}