A combo box that when changed, dispatches a command with the current selection as the arg.

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@737 ed5b42cb-e716-0410-a449-f6a68f950b19

src/as/com/threerings/flex/CommandComboBox.as

@@ -0,0 +1,78 @@
+//
+// $Id$
+//
+// Nenya library - tools for developing networked games
+// Copyright (C) 2002-2007 Three Rings Design, Inc., All Rights Reserved
+// http://www.threerings.net/code/nenya/
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library 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
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.threerings.flex {
+
+import flash.events.Event;
+
+import mx.controls.ComboBox;
+import mx.events.ListEvent;
+
+import com.threerings.util.CommandEvent;
+
+/**
+ * A combo box that dispatches a command (or calls a function) when it is toggled. NOTE: Unlike the
+ * other Command* controls, CommandComboBox does not guarantee that the CommandEvent is dispatched
+ * after notifying all other listeners.
+ */
+public class CommandComboBox extends ComboBox
+{
+    /**
+     * Create a command combobox. The 'data' attribute of the selectedItem object is used as
+     * an argument of the command or function.
+     *
+     * @param cmdOrFn either a String, which will be the CommandEvent command to dispatch,
+     *        or a function, which will be called when changed.
+     */
+    public function CommandComboBox (cmdOrFn :* = null)
+    {
+        CommandButton.validateCmd(cmdOrFn);
+        _cmdOrFn = cmdOrFn;
+
+        addEventListener(ListEvent.CHANGE, handleChange);
+    }
+
+    /**
+     * Set the command and argument to be issued when this button is pressed.
+     */
+    public function setCommand (cmd :String) :void
+    {
+        _cmdOrFn = cmd;
+    }
+
+    /**
+     * Set a callback function to call when the button is pressed.
+     */
+    public function setCallback (fn :Function) :void
+    {
+        _cmdOrFn = fn;
+    }
+
+    protected function handleChange (event :ListEvent) :void
+    {
+        CommandEvent.dispatch(this, _cmdOrFn, this.selectedItem.data);
+    }
+
+    /** The command (String) to submit, or the function (Function) to call
+     * when changed,  */
+    protected var _cmdOrFn :Object;
+}
+}