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

  Licensed to the Apache Software Foundation (ASF) under one or more
  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

  Unless required by applicable law or agreed to in writing, software
  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.

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<s:Module 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:local="*" creationComplete="init()">
	
	<!-- Based on original code from here and updated and enhanced for Flex 4:
		http://www.adobe.com/devnet/flex/articles/text_layout_framework_04.html
	-->
	
	<fx:Script>
		<![CDATA[
			import flashx.textLayout.container.ContainerController;
			import flashx.textLayout.conversion.ITextImporter;
			import flashx.textLayout.conversion.TextConverter;
			import flashx.textLayout.edit.EditManager;
			import flashx.textLayout.edit.ISelectionManager;
			import flashx.textLayout.edit.SelectionState;
			import flashx.textLayout.elements.InlineGraphicElement;
			import flashx.textLayout.elements.ParagraphElement;
			import flashx.textLayout.elements.TextFlow;
			import flashx.textLayout.events.SelectionEvent;
			import flashx.textLayout.events.StatusChangeEvent;
			import flashx.textLayout.formats.Direction;
			import flashx.textLayout.formats.TextLayoutFormat;
			import flashx.undo.UndoManager;
			
			import mx.collections.ArrayCollection;
			import mx.controls.CheckBox;
			import mx.events.FlexEvent;
			import mx.events.SliderEvent;
			
			import spark.components.Group;
			import spark.core.SpriteVisualElement;
			
			[Bindable]
			public var directions:ArrayCollection = new ArrayCollection(
				[
					{label:"Left-to-Right", data:Direction.LTR},
					{label:"Right-to-Left", data:Direction.RTL}
				]
			);
			
			[Embed(source="assets/ApacheFlexLogo.png")]
			[Bindable]
			static public var imgClass:Class;
			
			private var _textContainer:SpriteVisualElement = null;
			
			private static const textInput:XML = <TextFlow xmlns="http://ns.adobe.com/textLayout/2008">
				<div>
					<p><span>The Text Layout Framework is an extensible library, built on the new text engine in Adobe Flash Player 10, which delivers advanced, easy-to-integrate typographic and text layout features for rich, sophisticated and innovative typography on the web. 
				Some benefits provided by this framework include: 1) rich typographical controls, including kerning, ligatures, typographic case, digit case, digit width and discretionary hyphens
				2) cut, copy, paste, undo and standard keyboard and mouse gestures for editing 3) selection, editing and flowing text across multiple columns and linked containers 
				4) bidirectional text, vertical text and over 30 writing scripts including Arabic, Hebrew, Chinese, Japanese, Korean, Thai, Lao, Vietnamese, and others
				5) vertical text, Tate-Chu-Yoko (horizontal within vertical text) and justifier for East Asian typography. Try editing this text and playing with the options below! Notice an inline image is also included.</span></p>
				</div>
				</TextFlow>;
			
			private var _textFlow:TextFlow;
			
			private function init():void {
				
				_textContainer = new SpriteVisualElement();
				
				canvas.addElement(_textContainer);
				var importer:ITextImporter = TextConverter.getImporter(TextConverter.TEXT_LAYOUT_FORMAT);
				importer.throwOnError = true; // will throw exception if parsing error occurs on import

				_textFlow = importer.importToFlow(textInput);
				_textFlow.flowComposer.addController(new ContainerController(_textContainer, canvas.width-40, canvas.height));
				
				// add the graphic
				var p:ParagraphElement = new ParagraphElement();
				var inlineGraphicElement:InlineGraphicElement = new InlineGraphicElement();
				inlineGraphicElement.source = imgClass;
				inlineGraphicElement.width=32;
				inlineGraphicElement.height=32;
				p.addChild(inlineGraphicElement);
				_textFlow.addChild(p);
				
				//adding Select/Edit/Copy/Paste/Undo features
				_textFlow.interactionManager = new EditManager(new UndoManager());
				
				// initialize with a selection before the first character
				_textFlow.interactionManager.selectRange(0,0);
				_textFlow.flowComposer.updateAllControllers();
			}
			
			private function changeFontSize(event:Event):void {
				_textFlow.fontSize = fontSize.value;
				_textFlow.direction = direction.selectedItem.data;
				_textFlow.flowComposer.updateAllControllers();
			}
			
			private function changeNoColumns(event:Event):void {
				var tlf:TextLayoutFormat = new TextLayoutFormat();
				tlf.columnCount = cols.value;
				tlf.columnGap = 15;
				tlf.direction = direction.selectedItem.data;
				_textFlow.format = tlf;
				_textFlow.flowComposer.updateAllControllers();
			}
			
			private function changeTextDirection(event:Event):void {
				_textFlow.direction = (event.target as DropDownList).selectedItem.data;
				_textFlow.flowComposer.updateAllControllers();
			}
			
			protected function undo_clickHandler(event:MouseEvent):void
			{
				var em:EditManager = _textFlow.interactionManager as EditManager;
				trace("Can undo " + em.undoManager.canUndo() + " can redo " + em.undoManager.canRedo());
				em.undoManager.undo();
			}
			protected function redo_clickHandler(event:MouseEvent):void
			{
				var em:EditManager = _textFlow.interactionManager as EditManager;
				em.undoManager.redo();
			}

		]]>
	</fx:Script>
	<s:Panel title="Text Layout Framework Sample" width="100%" height="100%">
		<s:layout>
			<s:VerticalLayout paddingTop="8" paddingLeft="8"/>
		</s:layout>
		
		<s:VGroup>
			<s:Group id="canvas" width="600" height="200" />
			<s:HGroup width="100%" verticalAlign="middle">
				<s:Label text="Font Size:"/>
				<s:NumericStepper id="fontSize" minimum="6" maximum="22" snapInterval="1" change="changeFontSize(event)" value="12" />
				<s:Label text="# Columns:"/>
				<s:NumericStepper id="cols"  minimum="1" maximum="20" snapInterval="1" change="changeNoColumns(event)" />
				<s:Label text="Text Direction:"/>
				<s:DropDownList id="direction" change="changeTextDirection(event)" dataProvider="{directions}" 
								selectedItem="{directions.getItemAt(0)}"/>
				<s:Button label="Undo" click="undo_clickHandler(event)"/>
				<s:Button label="Redo" click="redo_clickHandler(event)"/>
			</s:HGroup>
		</s:VGroup>
	</s:Panel>
	
</s:Module>