Added a CommandButton which submits CommandEvents when it fires actions.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@1041 6335cc39-0255-0410-8fd6-9bcaacd3b74c

projects/samskivert/src/java/com/samskivert/swing/CommandButton.java

@@ -0,0 +1,93 @@
+//
+// $Id: CommandButton.java,v 1.1 2003/01/29 22:20:14 ray Exp $
+
+package com.samskivert.swing;
+
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import javax.swing.JButton;
+
+import com.samskivert.swing.event.CommandEvent;
+
+/**
+ * A button that fires CommandEvents when it is actioned.
+ */
+public class CommandButton extends JButton
+{
+    /**
+     * Set the argument of the CommandEvents which we generate.
+     */
+    public void setActionArgument (Object arg)
+    {
+        _argument = arg;
+    }
+
+    /**
+     * Get the argument that we'll use when we generate CommandEvents.
+     */
+    public Object getActionArgument ()
+    {
+        return _argument;
+    }
+
+    // documentation inherited
+    protected void fireActionPerformed (ActionEvent event)
+    {
+        Object[] listeners = listenerList.getListenerList();
+        ActionEvent e = null;
+        // Process the listeners last to first, notfiying
+        // those that are interested in this event
+        for (int ii = listeners.length - 2; ii >= 0; ii -= 2) {
+            if (listeners[ii] == ActionListener.class) {
+                // Lazily create the event:
+                if (e == null) {
+                    e = createEventToFire(event);
+                }
+                ((ActionListener) listeners[ii + 1]).actionPerformed(e);
+            }
+        }
+    }
+
+    /**
+     * Create the event to fire from the prototype.
+     * If this method were broken out in AbstractButton, we wouldn't even
+     * have had to override fireActionPerformed().
+     */
+    protected ActionEvent createEventToFire (ActionEvent proto)
+    {
+        String actionCommand = proto.getActionCommand();
+        if (actionCommand == null) {
+            actionCommand = getActionCommand();
+        }
+
+        Object arg = (proto instanceof CommandEvent)
+            ? arg = ((CommandEvent) proto).getArgument()
+            : null;
+
+        // if we were passed an actionevent, or if it was a 
+        // command event with a null arg..
+        if (arg == null) {
+            // use ours
+            arg = getActionArgument();
+        }
+
+        if (arg == null) {
+            // just create a plain actionEvent
+            return new ActionEvent(CommandButton.this,
+                                ActionEvent.ACTION_PERFORMED,
+                                actionCommand,
+                                proto.getWhen(),
+                                proto.getModifiers());
+        } else {
+            // if we found an arg somewhere, create a commandevent
+            return new CommandEvent(CommandButton.this,
+                                actionCommand,
+                                arg,
+                                proto.getWhen(),
+                                proto.getModifiers());
+        }
+    }
+
+    /** The CommandEvent argument for our actions. */
+    protected Object _argument;
+}

projects/samskivert/src/java/com/samskivert/swing/event/CommandEvent.java

@@ -1,5 +1,5 @@
 //
-// $Id: CommandEvent.java,v 1.3 2003/01/03 23:07:33 mdb Exp $
+// $Id: CommandEvent.java,v 1.4 2003/01/29 22:20:14 ray Exp $
 
 package com.samskivert.swing.event;
 
@@ -19,6 +19,14 @@ public class CommandEvent extends ActionEvent
         _argument = argument;
     }
 
+    public CommandEvent (
+        Object source, String command, Object argument,
+        long when, int modifiers)
+    {
+        super(source, ActionEvent.ACTION_PERFORMED, command, when, modifiers);
+        _argument = argument;
+    }
+
     /**
      * Returns the argument provided to the command event at construct
      * time.