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Tom Tromey
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466
libjava/classpath/java/awt/Button.java
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466
libjava/classpath/java/awt/Button.java
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/* Button.java -- AWT button widget
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Copyright (C) 1999, 2002, 2004, 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;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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import java.awt.peer.ButtonPeer;
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import java.lang.reflect.Array;
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import java.util.EventListener;
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import javax.accessibility.Accessible;
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import javax.accessibility.AccessibleAction;
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import javax.accessibility.AccessibleContext;
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import javax.accessibility.AccessibleRole;
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import javax.accessibility.AccessibleValue;
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/**
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* This class provides a button widget for the AWT.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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* @author Tom Tromey (tromey@cygnus.com)
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*/
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public class Button extends Component
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implements java.io.Serializable, Accessible
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{
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/*
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* Static Variables
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*/
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// FIXME: Need readObject/writeObject for serialization
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// Serialization version constant
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private static final long serialVersionUID = -8774683716313001058L;
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/*************************************************************************/
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/*
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* Instance Variables
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*/
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/**
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* @serial The action command name for this button.
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* This is package-private to avoid an accessor method.
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*/
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String actionCommand;
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/**
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* @serial The label for this button.
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* This is package-private to avoid an accessor method.
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*/
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String label;
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// List of ActionListeners for this class.
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private transient ActionListener action_listeners;
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/*
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* The number used to generate the name returned by getName.
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*/
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private static transient long next_button_number;
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protected class AccessibleAWTButton extends AccessibleAWTComponent
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implements AccessibleAction, AccessibleValue
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{
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protected AccessibleAWTButton()
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{
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// Do nothing here.
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}
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/* (non-Javadoc)
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* @see javax.accessibility.AccessibleAction#getAccessibleActionCount()
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*/
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public int getAccessibleActionCount()
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{
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// Only 1 action possible
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return 1;
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}
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/* (non-Javadoc)
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* @see javax.accessibility.AccessibleAction#getAccessibleActionDescription(int)
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*/
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public String getAccessibleActionDescription(int i)
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{
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// JDK 1.4.2 returns the string "click" for action 0. However, the API
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// docs don't say what the string to be returned is, beyond being a
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// description of the action. So we return the same thing for
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// compatibility with 1.4.2.
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if (i == 0)
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return "click";
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return null;
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}
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/* (non-Javadoc)
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* @see javax.accessibility.AccessibleAction#doAccessibleAction(int)
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*/
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public boolean doAccessibleAction(int i)
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{
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if (i != 0)
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return false;
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processActionEvent(new ActionEvent(this, ActionEvent.ACTION_PERFORMED, actionCommand));
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return true;
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}
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public String getAccessibleName()
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{
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return label;
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}
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public AccessibleAction getAccessibleAction()
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{
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return this;
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}
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public AccessibleValue getAccessibleValue()
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{
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return this;
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}
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/* (non-Javadoc)
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* @see javax.accessibility.AccessibleValue#getCurrentAccessibleValue()
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*/
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public Number getCurrentAccessibleValue()
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{
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// Docs say return 1 if selected, but buttons can't be selected, right?
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return new Integer(0);
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}
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/* (non-Javadoc)
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* @see javax.accessibility.AccessibleValue#setCurrentAccessibleValue(java.lang.Number)
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*/
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public boolean setCurrentAccessibleValue(Number number)
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{
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// Since there's no selection with buttons, we're ignoring this.
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// TODO someone who knows shoulw check this.
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return false;
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}
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/* (non-Javadoc)
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* @see javax.accessibility.AccessibleValue#getMinimumAccessibleValue()
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*/
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public Number getMinimumAccessibleValue()
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{
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return new Integer(0);
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}
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/* (non-Javadoc)
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* @see javax.accessibility.AccessibleValue#getMaximumAccessibleValue()
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*/
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public Number getMaximumAccessibleValue()
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{
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return new Integer(0);
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}
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public AccessibleRole getAccessibleRole()
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{
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return AccessibleRole.PUSH_BUTTON;
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}
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}
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/*************************************************************************/
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/*
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* Constructors
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*/
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/**
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* Initializes a new instance of <code>Button</code> with no label.
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*
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* @exception HeadlessException If GraphicsEnvironment.isHeadless()
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* returns true
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*/
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public
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Button()
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{
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this("");
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}
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/*************************************************************************/
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/**
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* Initializes a new instance of <code>Button</code> with the specified
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* label. The action command name is also initialized to this value.
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*
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* @param label The label to display on the button.
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*
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* @exception HeadlessException If GraphicsEnvironment.isHeadless()
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* returns true
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*/
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public
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Button(String label)
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{
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this.label = label;
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actionCommand = label;
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if (GraphicsEnvironment.isHeadless ())
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throw new HeadlessException ();
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}
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/*************************************************************************/
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/*
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* Instance Variables
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*/
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/**
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* Returns the label for this button.
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*
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* @return The label for this button.
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*/
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public String
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getLabel()
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{
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return(label);
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}
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/*************************************************************************/
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/**
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* Sets the label for this button to the specified value.
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*
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* @param label The new label for this button.
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*/
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public synchronized void
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setLabel(String label)
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{
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this.label = label;
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actionCommand = label;
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if (peer != null)
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{
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ButtonPeer bp = (ButtonPeer) peer;
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bp.setLabel (label);
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}
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}
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/*************************************************************************/
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/**
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* Returns the action command name for this button.
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*
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* @return The action command name for this button.
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*/
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public String
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getActionCommand()
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{
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return(actionCommand);
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}
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/*************************************************************************/
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/**
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* Sets the action command name for this button to the specified value.
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*
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* @param actionCommand The new action command name.
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*/
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public void
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setActionCommand(String actionCommand)
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{
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this.actionCommand = actionCommand == null ? label : actionCommand;
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}
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/*************************************************************************/
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/**
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* Adds a new entry to the list of listeners that will receive
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* action events from this button.
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*
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* @param listener The listener to add.
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*/
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public synchronized void
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addActionListener(ActionListener listener)
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{
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action_listeners = AWTEventMulticaster.add(action_listeners, listener);
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}
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/*************************************************************************/
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/**
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* Removes the specified listener from the list of listeners that will
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* receive action events from this button.
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*
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* @param listener The listener to remove.
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*/
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public synchronized void
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removeActionListener(ActionListener listener)
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{
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action_listeners = AWTEventMulticaster.remove(action_listeners, listener);
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}
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/**
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* Returns all added <code>ActionListener</code> objects.
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*
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* @return an array of listeners
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*
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* @since 1.4
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*/
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public synchronized ActionListener[] getActionListeners()
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{
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return (ActionListener[])
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AWTEventMulticaster.getListeners(action_listeners,
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ActionListener.class);
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}
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/**
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* Returns all registered EventListers of the given listenerType.
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* listenerType must be a subclass of EventListener, or a
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* ClassClassException is thrown.
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*
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* @param listenerType the listener type to return
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*
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* @return an array of listeners
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*
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* @exception ClassCastException If listenerType doesn't specify a class or
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* interface that implements @see java.util.EventListener.
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*
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* @since 1.3
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*/
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public EventListener[] getListeners(Class listenerType)
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{
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if (listenerType == ActionListener.class)
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return getActionListeners();
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return (EventListener[]) Array.newInstance(listenerType, 0);
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}
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/*************************************************************************/
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/**
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* Notifies this button that it should create its native peer object.
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*/
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public void
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addNotify()
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{
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if (peer == null)
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peer = getToolkit ().createButton (this);
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super.addNotify();
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}
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/*************************************************************************/
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/**
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* Processes an event for this button. If the specified event is an
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* instance of <code>ActionEvent</code>, then the
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* <code>processActionEvent()</code> method is called to dispatch it
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* to any registered listeners. Otherwise, the superclass method
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* will be invoked. Note that this method will not be called at all
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* unless <code>ActionEvent</code>'s are enabled. This will be done
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* implicitly if any listeners are added.
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*
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* @param event The event to process.
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*/
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protected void
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processEvent(AWTEvent event)
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{
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if (event instanceof ActionEvent)
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processActionEvent((ActionEvent)event);
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else
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super.processEvent(event);
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}
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/*************************************************************************/
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/**
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* This method dispatches an action event for this button to any
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* registered listeners.
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*
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* @param event The event to process.
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*/
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protected void
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processActionEvent(ActionEvent event)
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{
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if (action_listeners != null)
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action_listeners.actionPerformed(event);
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}
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void
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dispatchEventImpl(AWTEvent e)
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{
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if (e.id <= ActionEvent.ACTION_LAST
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&& e.id >= ActionEvent.ACTION_FIRST
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&& (action_listeners != null
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|| (eventMask & AWTEvent.ACTION_EVENT_MASK) != 0))
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processEvent(e);
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else
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super.dispatchEventImpl(e);
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}
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/*************************************************************************/
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/**
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* Returns a debugging string for this button.
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*
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* @return A debugging string for this button.
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*/
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protected String
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paramString()
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{
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return getName () + "," + getX () + "," + getY () + ","
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+ getWidth () + "x" + getHeight () + ",label=" + getLabel ();
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}
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/**
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* Gets the AccessibleContext associated with this <code>Button</code>.
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* The context is created, if necessary.
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*
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* @return the associated context
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*/
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public AccessibleContext getAccessibleContext()
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{
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/* Create the context if this is the first request */
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if (accessibleContext == null)
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accessibleContext = new AccessibleAWTButton();
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return accessibleContext;
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}
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/**
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* Generate a unique name for this button.
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*
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* @return A unique name for this button.
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*/
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String generateName ()
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{
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return "button" + getUniqueLong ();
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}
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private static synchronized long getUniqueLong ()
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{
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return next_button_number++;
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}
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} // class Button
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