Radii8Library/src/com/flexcapacitor/views/HistoryToolBar.mxml

<?xml version="1.0" encoding="utf-8"?>
<!--

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contributor license agreements.  See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License.  You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

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distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

-->
<s:Group xmlns:fx="http://ns.adobe.com/mxml/2009" 
		 xmlns:s="library://ns.adobe.com/flex/spark" 
		 xmlns:mx="library://ns.adobe.com/flex/mx" 
		 xmlns:c="com.flexcapacitor.controls.*"
		 
		 creationComplete="creationCompleteHandler(event)">
	
	
	<!-- 
	
	-->
	<fx:Script>
		<![CDATA[
			import com.flexcapacitor.controller.Radiate;
			import com.flexcapacitor.events.RadiateEvent;
			
			import mx.events.FlexEvent;

			
			
			private var radiate:Radiate = Radiate.instance;
			
			protected function creationCompleteHandler(event:FlexEvent):void {
				radiate.addEventListener(RadiateEvent.HISTORY_CHANGE, historyChangeHandler, false, 0, true);
				
				updateNavigationButtons();
			}
			
			/**
			 * History changed. Select the last applied item in the history array. 
			 * */
			protected function historyChangeHandler(event:Event):void {
				updateNavigationButtons();
			}
			
			/**
			 * 
			 * */
			public function redo():void {
				var historyIndex:int = Radiate.redo(true);
				
				
				//Radiate.history.refresh();
				
				//list.selectedIndex = historyIndex;
				
				updateNavigationButtons();
				
			}
			
			/**
			 * 
			 * */
			public function undo():void {
				var historyIndex:int = Radiate.undo(true);
				
				//Radiate.history.refresh();
				
				//list.selectedIndex = Radiate.historyIndex;
				
				updateNavigationButtons();
			}
			
			public function updateNavigationButtons():void {
				var historyIndex:int = Radiate.historyIndex;
				var totalItems:int = Radiate.history ? Radiate.history.length : 0;
				var hasItems:Boolean = totalItems>0;
				
				// has forward history
				if (hasItems && historyIndex+1<totalItems) {
					forwardButton.enabled = true;
				}
				else {
					forwardButton.enabled = false;
				}
				
				// has previous items
				if (hasItems && historyIndex>-1) {
					backButton.enabled = true;
				}
				else {
					backButton.enabled = false;
				}
			}
		]]>
	</fx:Script>
	
		
	<s:layout>
		<s:HorizontalLayout paddingTop="4" verticalAlign="baseline" />
	</s:layout>

	<c:ImageButton id="backButton" source="{Radii8LibraryAssets.undo}" 
						  height="15"
						  alpha=".8"
						  click="undo()" 
						  />
	<c:ImageButton id="forwardButton" source="{Radii8LibraryAssets.redo}"
						  height="15"
						  alpha=".8"
						  click="redo()" 
						  />
</s:Group>