135 lines
3.1 KiB
Java
135 lines
3.1 KiB
Java
/* Copyright (C) 2000, 2001 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.awt;
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import java.awt.peer.CheckboxMenuItemPeer;
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import java.awt.event.ItemListener;
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import java.awt.event.ItemEvent;
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/** This implements a menu item which keeps track of a boolean state.
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* @author Tom Tromey <tromey@redhat.com>
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* @date December 25, 2000
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*/
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public class CheckboxMenuItem extends MenuItem implements ItemSelectable
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{
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/** Create a new CheckboxMenuItem.
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* @param label The checkbox label. A null value is the same as "";
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* null is the default.
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* @param state The initial check state; defaults to false.
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*/
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public CheckboxMenuItem ()
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{
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this (null, false);
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}
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public CheckboxMenuItem (String label)
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{
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this (label, false);
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}
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public CheckboxMenuItem (String label, boolean state)
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{
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this.label = label;
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this.state = state;
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}
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/** Add a listener for item events.
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* @param listener The listener to add.
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*/
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public synchronized void addItemListener (ItemListener listener)
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{
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listeners = AWTEventMulticaster.add (listeners, listener);
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}
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/** This creates the component's peer. */
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public void addNotify ()
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{
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if (peer != null)
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{
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// This choice of toolkit seems unsatisfying, but I'm not sure
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// what else to do.
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peer = Toolkit.getDefaultToolkit ().createCheckboxMenuItem (this);
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}
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super.addNotify ();
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}
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/** Returns this checkbox's label if this checkbox is selected. */
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public Object[] getSelectedObjects ()
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{
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Object[] r;
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if (state)
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{
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r = new Object[1];
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r[0] = label;
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}
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else
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r = new Object[0];
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return r;
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}
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/** Returns the current state of this checkbox. */
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public boolean getState ()
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{
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return state;
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}
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/** Generates a String representation of this Checkbox's state. */
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public String paramString ()
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{
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return ("[" + getClass ().getName ()
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+ "state=" + state + ","
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+ "label=" + label + "]");
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}
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/** Process an event for this Checkbox.
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* @param event The event the process.
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*/
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protected void processEvent (AWTEvent event)
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{
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if (event instanceof ItemEvent)
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processItemEvent ((ItemEvent) event);
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else
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super.processEvent (event);
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}
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/** Process an item event for this Checkbox.
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* @param event The ItemEvent to process
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*/
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protected void processItemEvent (ItemEvent event)
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{
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if (listeners != null)
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listeners.itemStateChanged (event);
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}
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/** Remove an item listener.
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* @param listener Item listener to remove.
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*/
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public synchronized void removeItemListener (ItemListener listener)
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{
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listeners = AWTEventMulticaster.remove (listeners, listener);
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}
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/** Set the checkbox's state.
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* @param state The new state.
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*/
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public void setState (boolean state)
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{
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this.state = state;
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if (peer != null)
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{
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CheckboxMenuItemPeer cp = (CheckboxMenuItemPeer) peer;
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cp.setState (state);
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}
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}
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// Private state.
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String label;
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boolean state;
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ItemListener listeners;
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}
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