Michael Bayne
125 lines
3.8 KiB
ActionScript
125 lines
3.8 KiB
ActionScript
//
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// Nenya library - tools for developing networked games
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// Copyright (C) 2002-2012 Three Rings Design, Inc., All Rights Reserved
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// http://code.google.com/p/nenya/
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package com.threerings.flex {
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import flash.events.Event;
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import mx.controls.ComboBox;
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import mx.events.ListEvent;
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import com.threerings.util.CommandEvent;
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import com.threerings.util.Util;
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/**
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* A combo box that dispatches a command (or calls a callback) when an item is selected.
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* The argument will be the 'data' value of the selected item.
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* NOTE: Unlike the other Command* controls, CommandComboBox allows a null cmd/callback
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* to be specified.
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*/
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public class CommandComboBox extends ComboBox
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{
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/** The field of the selectedItem object used as the 'data'. If this property is null,
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* then the item is the data. */
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public var dataField :String = "data";
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/**
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* Create a command combobox.
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*
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* @param cmdOrFn either a String, which will be the CommandEvent command to dispatch,
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* or a function, which will be called when changed.
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*/
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public function CommandComboBox (cmdOrFn :* = null)
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{
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CommandButton.validateCmd(cmdOrFn);
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_cmdOrFn = cmdOrFn;
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addEventListener(ListEvent.CHANGE, handleChange, false, int.MIN_VALUE);
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}
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/**
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* Set the command and argument to be issued when this button is pressed.
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*/
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public function setCommand (cmd :String) :void
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{
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_cmdOrFn = cmd;
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}
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/**
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* Set a callback function to call when the button is pressed.
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*/
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public function setCallback (fn :Function) :void
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{
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_cmdOrFn = fn;
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}
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/**
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* Set the selectedItem based on the data field.
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*/
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public function set selectedData (data :Object) :void
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{
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for (var ii :int = 0; ii < dataProvider.length; ++ii) {
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if (Util.equals(data, itemToData(dataProvider[ii]))) {
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this.selectedIndex = ii;
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return;
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}
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}
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// not found, clear the selection
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this.selectedIndex = -1;
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}
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/**
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* The value that will be passed to the command or function based on dataField and the
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* current selected item.
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*/
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public function get selectedData () :Object
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{
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return itemToData(this.selectedItem);
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}
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/**
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* Extract the data from the specified item. This can be expanded in the future
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* if we provide a 'dataFunction'.
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*/
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protected function itemToData (item :Object) :Object
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{
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if (item != null && dataField != null) {
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try {
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return item[dataField];
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} catch (re :ReferenceError) {
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// fallback to just returning the item
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}
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}
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return item;
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}
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protected function handleChange (event :ListEvent) :void
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{
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if (_cmdOrFn != null && this.selectedIndex != -1) {
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CommandEvent.dispatch(this, _cmdOrFn, selectedData);
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}
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}
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/** The command (String) to submit, or the function (Function) to call
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* when changed, */
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protected var _cmdOrFn :Object;
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}
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}
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