MenuItem.java (paramString): Now protected.

* java/awt/MenuItem.java (paramString): Now protected.

	* java/awt/MenuShortcut.java: Implements Serializable.

	* java/awt/MenuBar.java: Rewrote from scratch.

	* java/awt/MenuComponent.java (removeNotify): Wrote.
	Implements Serializable.

	* java/awt/GridBagConstraints.java (GridBagConstraints): New
	constructor.

	* java/awt/CheckboxMenuItem.java: Wrote.

From-SVN: r38488

libjava/java/awt/CheckboxMenuItem.java

@@ -7,9 +7,127 @@ Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
 details.  */
 
 package java.awt;
+import java.awt.peer.CheckboxMenuItemPeer;
+import java.awt.event.ItemListener;
+import java.awt.event.ItemEvent;
 
-/* A very incomplete placeholder. */
-
-public class CheckboxMenuItem extends MenuItem
+/** This implements a menu item which keeps track of a boolean state.
+ * @author Tom Tromey <tromey@redhat.com>
+ * @date December 25, 2000
+ */
+public class CheckboxMenuItem extends MenuItem implements ItemSelectable
 {
+  /** Create a new CheckboxMenuItem.
+   * @param label The checkbox label.  A null value is the same as "";
+   *              null is the default.
+   * @param state The initial check state; defaults to false.
+   */
+  public CheckboxMenuItem ()
+  {
+    this (null, false);
+  }
+
+  public CheckboxMenuItem (String label)
+  {
+    this (label, false);
+  }
+
+  public CheckboxMenuItem (String label, boolean state)
+  {
+    this.label = label;
+    this.state = state;
+  }
+
+  /** Add a listener for item events.
+   * @param listener The listener to add.
+   */
+  public synchronized void addItemListener (ItemListener listener)
+  {
+    listeners = AWTEventMulticaster.add (listeners, listener);
+  }
+
+  /** This creates the component's peer.  */
+  public void addNotify ()
+  {
+    if (peer != null)
+      {
+	// This choice of toolkit seems unsatisfying, but I'm not sure
+	// what else to do.
+	peer = Toolkit.getDefaultToolkit ().createCheckboxMenuItem (this);
+      }
+  }
+
+  /** Returns this checkbox's label if this checkbox is selected.  */
+  public Object[] getSelectedObjects ()
+  {
+    Object[] r;
+    if (state)
+      {
+	r = new Object[1];
+	r[0] = label;
+      }
+    else
+      r = new Object[0];
+    return r;
+  }
+
+  /** Returns the current state of this checkbox.  */
+  public boolean getState ()
+  {
+    return state;
+  }
+
+  /** Generates a String representation of this Checkbox's state.  */
+  public String paramString ()
+  {
+    return ("[" + getClass ().getName ()
+	    + "state=" + state + ","
+	    + "label=" + label + "]");
+  }
+
+  /** Process an event for this Checkbox.
+   * @param event The event the process.
+   */
+  protected void processEvent (AWTEvent event) 
+  {
+    if (event instanceof ItemEvent)
+      processItemEvent ((ItemEvent) event);
+    else
+      super.processEvent (event);
+  }
+
+  /** Process an item event for this Checkbox.
+   * @param event The ItemEvent to process
+   */
+  protected void processItemEvent (ItemEvent event)
+  {
+    if (listeners != null)
+      listeners.itemStateChanged (event);
+  }
+
+  /** Remove an item listener.
+   * @param listener Item listener to remove.
+   */
+  public synchronized void removeItemListener (ItemListener listener)
+  {
+    listeners = AWTEventMulticaster.remove (listeners, listener);
+  }
+
+  /** Set the checkbox's state.
+   * @param state The new state.
+   */
+  public void setState (boolean state)
+  {
+    this.state = state;
+    if (peer != null)
+      {
+	CheckboxMenuItemPeer cp = (CheckboxMenuItemPeer) peer;
+	cp.setState (state);
+      }
+  }
+
+  // Private state.
+  String label;
+  boolean state;
+  ItemListener listeners;
 }