mirror of git://gcc.gnu.org/git/gcc.git
381 lines
9.6 KiB
Java
381 lines
9.6 KiB
Java
/* Checkbox.java -- An AWT checkbox widget
|
|
Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
|
|
package java.awt;
|
|
|
|
import java.awt.peer.CheckboxPeer;
|
|
import java.awt.peer.ComponentPeer;
|
|
import java.awt.event.ItemEvent;
|
|
import java.awt.event.ItemListener;
|
|
import java.io.Serializable;
|
|
|
|
/**
|
|
* This class implements a component which has an on/off state. Two
|
|
* or more Checkboxes can be grouped by a CheckboxGroup.
|
|
*
|
|
* @author Aaron M. Renn (arenn@urbanophile.com)
|
|
* @author Tom Tromey <tromey@redhat.com>
|
|
*/
|
|
public class Checkbox extends Component implements ItemSelectable, Serializable
|
|
{
|
|
|
|
// FIXME: Need readObject/writeObject for this.
|
|
|
|
/*
|
|
* Static Variables
|
|
*/
|
|
|
|
// Serialization Constant
|
|
private static final long serialVersionUID = 7270714317450821763L;
|
|
|
|
/*************************************************************************/
|
|
|
|
/*
|
|
* Instance Variables
|
|
*/
|
|
|
|
/**
|
|
* @serial The checkbox group for this checkbox.
|
|
*/
|
|
private CheckboxGroup group;
|
|
|
|
/**
|
|
* @serial The label on this checkbox.
|
|
*/
|
|
private String label;
|
|
|
|
/**
|
|
* @serial The state of this checkbox.
|
|
*/
|
|
private boolean state;
|
|
|
|
// The list of listeners for this object.
|
|
private transient ItemListener item_listeners;
|
|
|
|
/*************************************************************************/
|
|
|
|
/*
|
|
* Constructors
|
|
*/
|
|
|
|
/**
|
|
* Initializes a new instance of <code>Checkbox</code> with no label,
|
|
* an initial state of off, and that is not part of any checkbox group.
|
|
*/
|
|
public
|
|
Checkbox()
|
|
{
|
|
this("", false, null);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Initializes a new instance of <code>Checkbox</code> with the specified
|
|
* label, an initial state of off, and that is not part of any checkbox
|
|
* group.
|
|
*
|
|
* @param label The label for this checkbox.
|
|
*/
|
|
public
|
|
Checkbox(String label)
|
|
{
|
|
this(label, false, null);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Initializes a new instance of <code>Checkbox</code> with the specified
|
|
* label and initial state, and that is not part of any checkbox
|
|
* group.
|
|
*
|
|
* @param label The label for this checkbox.
|
|
* @param state The initial state of the checkbox, <code>true</code> for
|
|
* on, <code>false</code> for off.
|
|
*/
|
|
public
|
|
Checkbox(String label, boolean state)
|
|
{
|
|
this(label, state, null);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Initializes a new instance of <code>Checkbox</code> with the specified
|
|
* label, initial state, and checkbox group.
|
|
*
|
|
* @param label The label for this checkbox.
|
|
* @param group The checkbox group for this box, or <code>null</code>
|
|
* if there is no checkbox group.
|
|
* @param state The initial state of the checkbox, <code>true</code> for
|
|
* on, <code>false</code> for off.
|
|
*/
|
|
public
|
|
Checkbox(String label, CheckboxGroup group, boolean state)
|
|
{
|
|
this(label, state, group);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Initializes a new instance of <code>Checkbox</code> with the specified
|
|
* label, initial state, and checkbox group.
|
|
*
|
|
* @param label The label for this checkbox.
|
|
* @param state The initial state of the checkbox, <code>true</code> for
|
|
* on, <code>false</code> for off.
|
|
* @param group The checkbox group for this box, or <code>null</code>
|
|
* if there is no checkbox group.
|
|
*/
|
|
public
|
|
Checkbox(String label, boolean state, CheckboxGroup group)
|
|
{
|
|
this.label = label;
|
|
this.state = state;
|
|
this.group = group;
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/*
|
|
* Instance Variables
|
|
*/
|
|
|
|
/**
|
|
* Returns the label for this checkbox.
|
|
*
|
|
* @return The label for this checkbox.
|
|
*/
|
|
public String
|
|
getLabel()
|
|
{
|
|
return(label);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Sets the label for this checkbox to the specified value.
|
|
*
|
|
* @param label The new checkbox label.
|
|
*/
|
|
public synchronized void
|
|
setLabel(String label)
|
|
{
|
|
this.label = label;
|
|
if (peer != null)
|
|
{
|
|
CheckboxPeer cp = (CheckboxPeer) peer;
|
|
cp.setLabel(label);
|
|
}
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns the state of this checkbox.
|
|
*
|
|
* @return The state of this checkbox, which will be <code>true</code> for
|
|
* on and <code>false</code> for off.
|
|
*/
|
|
public boolean
|
|
getState()
|
|
{
|
|
return(state);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Sets the state of this checkbox to the specified value.
|
|
*
|
|
* @param state The new state of the checkbox, which will be <code>true</code>
|
|
* for on or <code>false</code> for off.
|
|
*/
|
|
public synchronized void
|
|
setState(boolean state)
|
|
{
|
|
this.state = state;
|
|
if (peer != null)
|
|
{
|
|
CheckboxPeer cp = (CheckboxPeer) peer;
|
|
cp.setState (state);
|
|
}
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns an array of length one containing the checkbox label if this
|
|
* checkbox is selected. Otherwise <code>null</code> is returned.
|
|
*
|
|
* @return The selection state of this checkbox.
|
|
*/
|
|
public Object[]
|
|
getSelectedObjects()
|
|
{
|
|
if (state == false)
|
|
return(null);
|
|
|
|
Object[] objs = new Object[1];
|
|
objs[0] = label;
|
|
|
|
return(objs);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns the checkbox group this object is a member of, if any.
|
|
*
|
|
* @return This object's checkbox group, of <code>null</code> if it is
|
|
* not a member of any group.
|
|
*/
|
|
public CheckboxGroup
|
|
getCheckboxGroup()
|
|
{
|
|
return(group);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Sets this object's checkbox group to the specified group.
|
|
*
|
|
* @param group The new checkbox group, or <code>null</code> to make this
|
|
* object part of no checkbox group.
|
|
*/
|
|
public synchronized void
|
|
setCheckboxGroup(CheckboxGroup group)
|
|
{
|
|
this.group = group;
|
|
if (peer != null)
|
|
{
|
|
CheckboxPeer cp = (CheckboxPeer) peer;
|
|
cp.setCheckboxGroup (group);
|
|
}
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Creates this object's native peer.
|
|
*/
|
|
public void
|
|
addNotify()
|
|
{
|
|
if (peer == null)
|
|
peer = getToolkit ().createCheckbox (this);
|
|
super.addNotify ();
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Adds a new listeners to the list of registered listeners for this object.
|
|
*
|
|
* @param listener The new listener to add.
|
|
*/
|
|
public synchronized void
|
|
addItemListener(ItemListener listener)
|
|
{
|
|
item_listeners = AWTEventMulticaster.add(item_listeners, listener);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Removes a listener from the list of registered listeners for this object.
|
|
*
|
|
* @param listener The listener to remove.
|
|
*/
|
|
public synchronized void
|
|
removeItemListener(ItemListener listener)
|
|
{
|
|
item_listeners = AWTEventMulticaster.remove(item_listeners, listener);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Processes this event by calling <code>processItemEvent()</code> if it
|
|
* is any instance of <code>ItemEvent</code>. Otherwise it is passed to
|
|
* the superclass for processing.
|
|
*
|
|
* @param event The event to process.
|
|
*/
|
|
protected void
|
|
processEvent(AWTEvent event)
|
|
{
|
|
if (event instanceof ItemEvent)
|
|
processItemEvent((ItemEvent)event);
|
|
else
|
|
super.processEvent(event);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Processes this event by dispatching it to any registered listeners.
|
|
*
|
|
* @param event The <code>ItemEvent</code> to process.
|
|
*/
|
|
protected void
|
|
processItemEvent(ItemEvent event)
|
|
{
|
|
if (item_listeners != null)
|
|
item_listeners.itemStateChanged(event);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns a debugging string for this object.
|
|
*/
|
|
protected String
|
|
paramString()
|
|
{
|
|
return ("label=" + label + ",state=" + state + ",group=" + group
|
|
+ "," + super.paramString());
|
|
}
|
|
|
|
} // class Checkbox
|