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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [java/] [awt/] [event/] [FocusEvent.java] - Blame information for rev 867

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1 771 jeremybenn 
/* FocusEvent.java -- generated for a focus change
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   Copyright (C) 1999, 2002, 2005  Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING.  If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library.  Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.event;
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import java.awt.Component;
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/**
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 * This class represents an event generated when a focus change occurs for a
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 * component. There are both temporary changes, such as when focus is stolen
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 * during a sroll then returned, and permanent changes, such as when the user
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 * TABs through focusable components.
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 *
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 * @author Aaron M. Renn (arenn@urbanophile.com)
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 * @see FocusAdapter
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 * @see FocusListener
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 * @since 1.1
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 * @status updated to 1.4
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 */
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public class FocusEvent extends ComponentEvent
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{
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  /**
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   * Compatible with JDK 1.1+.
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   */
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  private static final long serialVersionUID = 523753786457416396L;
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  /** This is the first id in the range of ids used by this class. */
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  public static final int FOCUS_FIRST = 1004;
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  /** This is the last id in the range of ids used by this class. */
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  public static final int FOCUS_LAST = 1005;
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  /** This is the event id for a focus gained event. */
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  public static final int FOCUS_GAINED = 1004;
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  /** This is the event id for a focus lost event. */
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  public static final int FOCUS_LOST = 1005;
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  /**
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   * Indicates whether or not the focus change is temporary.
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   *
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   * @see #isTemporary()
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   * @serial true if the focus change is temporary
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   */
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  private final boolean temporary;
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  /**
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   * The other component which is giving up or stealing focus from this
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   * component, if known.
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   *
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   * @see #getOppositeComponent()
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   * @serial the component with the opposite focus event, or null
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   * @since 1.4
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   */
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  private final Component opposite;
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  /**
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   * Initializes a new instance of <code>FocusEvent</code> with the
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   * specified source, id, temporary status, and opposite counterpart. Note
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   * that an invalid id leads to unspecified results.
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   *
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   * @param source the component that is gaining or losing focus
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   * @param id the event id
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   * @param temporary true if the focus change is temporary
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   * @param opposite the component receiving the opposite focus event, or null
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   * @throws IllegalArgumentException if source is null
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   */
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  public FocusEvent(Component source, int id, boolean temporary,
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                    Component opposite)
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  {
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    super(source, id);
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    this.temporary = temporary;
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    this.opposite = opposite;
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  }
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  /**
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   * Initializes a new instance of <code>FocusEvent</code> with the
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   * specified source, id, and temporary status. Note that an invalid id
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   * leads to unspecified results.
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   *
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   * @param source the component that is gaining or losing focus
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   * @param id the event id
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   * @param temporary true if the focus change is temporary
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   * @throws IllegalArgumentException if source is null
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   */
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  public FocusEvent(Component source, int id, boolean temporary)
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  {
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    this(source, id, temporary, null);
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  }
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  /**
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   * Initializes a new instance of <code>FocusEvent</code> with the
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   * specified source and id. Note that an invalid id leads to unspecified
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   * results.
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   *
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   * @param source the component that is gaining or losing focus
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   * @param id the event id
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   * @throws IllegalArgumentException if source is null
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   */
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  public FocusEvent(Component source, int id)
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  {
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    this(source, id, false, null);
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  }
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  /**
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   * This method tests whether or not the focus change is temporary or
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   * permanent.
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   *
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   * @return true if the focus change is temporary
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   */
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  public boolean isTemporary()
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  {
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    return temporary;
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  }
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  /**
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   * Returns the component which received the opposite focus event. If this
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   * component gained focus, the opposite lost focus; likewise if this
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   * component is giving up focus, the opposite is gaining it. If this
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   * information is unknown, perhaps because the opposite is a native
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   * application, this returns null.
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   *
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   * @return the component with the focus opposite, or null
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   * @since 1.4
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   */
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  public Component getOppositeComponent()
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  {
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    return opposite;
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  }
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  /**
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   * Returns a string identifying this event. This is formatted as:
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   * <code>(getID() == FOCUS_GAINED ? "FOCUS_GAINED" : "FOCUS_LOST")
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   * + (isTemporary() ? ",temporary," : ",permanent,") + "opposite="
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   * + getOppositeComponent()</code>.
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   *
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   * @return a string identifying this event
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   */
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  public String paramString()
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  {
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    return (id == FOCUS_GAINED ? "FOCUS_GAINED"
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            : id == FOCUS_LOST ? "FOCUS_LOST" : "unknown type")
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      + (temporary ? ",temporary,opposite=" : ",permanent,opposite=")
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      + opposite;
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  }
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} // class FocusEvent

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