////////////////////////////////////////////////////////////////////////////////
//
//  ADOBE SYSTEMS INCORPORATED
//  Copyright 2003-2007 Adobe Systems Incorporated
//  All Rights Reserved.
//
//  NOTICE: Adobe permits you to use, modify, and distribute this file
//  in accordance with the terms of the license agreement accompanying it.
//
////////////////////////////////////////////////////////////////////////////////

package mx.skins.halo
{

import flash.display.GradientType;
import mx.core.IButton;
import mx.core.UIComponent;
import mx.skins.Border;
import mx.styles.StyleManager;
import mx.utils.ColorUtil;

/**
 *  The skin for all the states of a Button.
 *  
 *  @langversion 3.0
 *  @playerversion Flash 9
 *  @playerversion AIR 1.1
 *  @productversion Flex 3
 */
public class ButtonSkin extends Border
{
	include "../../core/Version.as";

	//--------------------------------------------------------------------------
	//
	//  Class variables
	//
	//--------------------------------------------------------------------------

	/**
	 *  @private
	 */
	private static var cache:Object = {}; 
	
	//--------------------------------------------------------------------------
	//
	//  Class methods
	//
	//--------------------------------------------------------------------------

	/**
	 *  @private
	 *  Several colors used for drawing are calculated from the base colors
	 *  of the component (themeColor, borderColor and fillColors).
	 *  Since these calculations can be a bit expensive,
	 *  we calculate once per color set and cache the results.
	 */
	private static function calcDerivedStyles(themeColor:uint,
											  fillColor0:uint,
											  fillColor1:uint):Object
	{
		var key:String = HaloColors.getCacheKey(themeColor,
												fillColor0, fillColor1);
				
		if (!cache[key])
		{
			var o:Object = cache[key] = {};
			
			// Cross-component styles.
			HaloColors.addHaloColors(o, themeColor, fillColor0, fillColor1);
		}
		
		return cache[key];
	}
	
	//--------------------------------------------------------------------------
	//
	//  Constructor
	//
	//--------------------------------------------------------------------------

	/**
	 *  Constructor.
	 *  
	 *  @langversion 3.0
	 *  @playerversion Flash 9
	 *  @playerversion AIR 1.1
	 *  @productversion Flex 3
	 */
	public function ButtonSkin()
	{
		super();
	}
	
	//--------------------------------------------------------------------------
	//
	//  Overridden properties
	//
	//--------------------------------------------------------------------------

	//----------------------------------
	//  measuredWidth
	//----------------------------------
	
	/**
	 *  @private
	 */
	override public function get measuredWidth():Number
	{
		return UIComponent.DEFAULT_MEASURED_MIN_WIDTH;
	}
	
	//----------------------------------
	//  measuredHeight
	//----------------------------------

	/**
	 *  @private
	 */
	override public function get measuredHeight():Number
	{
		return UIComponent.DEFAULT_MEASURED_MIN_HEIGHT;
	}

	//--------------------------------------------------------------------------
	//
	//  Overridden methods
	//
	//--------------------------------------------------------------------------
	
	/**
	 *  @private
	 */
	override protected function updateDisplayList(w:Number, h:Number):void
	{
		super.updateDisplayList(w, h);

		// User-defined styles.
		var borderColor:uint = getStyle("borderColor");
		var cornerRadius:Number = getStyle("cornerRadius");
		var fillAlphas:Array = getStyle("fillAlphas");
		var fillColors:Array = getStyle("fillColors");
        styleManager.getColorNames(fillColors);
		var highlightAlphas:Array = getStyle("highlightAlphas");				
		var themeColor:uint = getStyle("themeColor");

		// Derivative styles.
		var derStyles:Object = calcDerivedStyles(themeColor, fillColors[0],
												 fillColors[1]);

		var borderColorDrk1:Number =
			ColorUtil.adjustBrightness2(borderColor, -50);
		
		var themeColorDrk1:Number =
			ColorUtil.adjustBrightness2(themeColor, -25);
		
		var emph:Boolean = false;
		
		if (parent is IButton)
			emph = IButton(parent).emphasized;
			
		var cr:Number = Math.max(0, cornerRadius);
		var cr1:Number = Math.max(0, cornerRadius - 1);
		var cr2:Number = Math.max(0, cornerRadius - 2);
		
		var tmp:Number;
		
		graphics.clear();
												
		switch (name)
		{			
			case "selectedUpSkin":
			case "selectedOverSkin":
			{
				// button border/edge
				drawRoundRect(
					0, 0, w, h, cr,
					[ themeColor, themeColorDrk1 ], 1,
					verticalGradientMatrix(0, 0, w, h )); 
												
				// button fill
				drawRoundRect(
					1, 1, w - 2, h - 2, cr1,
					[ fillColors[1], fillColors[1] ], 1,
					verticalGradientMatrix(0, 0, w - 2, h - 2));
										  				
				break;
			}

			case "upSkin":
			{
   				var upFillColors:Array = [ fillColors[0], fillColors[1] ];
   				
				var upFillAlphas:Array = [ fillAlphas[0], fillAlphas[1] ];

				if (emph)
				{
					// button border/edge
					drawRoundRect(
						0, 0, w, h, cr,
						[ themeColor, themeColorDrk1 ], 1,
						verticalGradientMatrix(0, 0, w, h ),
						GradientType.LINEAR, null, 
						{ x: 2, y: 2, w: w - 4, h: h - 4, r: cornerRadius - 2 });
                            
					// button fill
					drawRoundRect(
						2, 2, w - 4, h - 4, cr2,
						upFillColors, upFillAlphas,
						verticalGradientMatrix(2, 2, w - 2, h - 2));
										  
					// top highlight
					drawRoundRect(
						2, 2, w - 4, (h - 4) / 2,
						{ tl: cr2, tr: cr2, bl: 0, br: 0 },
						[ 0xFFFFFF, 0xFFFFFF ], highlightAlphas,
						verticalGradientMatrix(1, 1, w - 2, (h - 2) / 2)); 
				}
				else
				{
					// button border/edge
					drawRoundRect(
						0, 0, w, h, cr,
						[ borderColor, borderColorDrk1 ], 1,
						verticalGradientMatrix(0, 0, w, h ),
						GradientType.LINEAR, null, 
						{ x: 1, y: 1, w: w - 2, h: h - 2, r: cornerRadius - 1 }); 

					// button fill
					drawRoundRect(
						1, 1, w - 2, h - 2, cr1,
						upFillColors, upFillAlphas,
						verticalGradientMatrix(1, 1, w - 2, h - 2)); 

					// top highlight
					drawRoundRect(
						1, 1, w - 2, (h - 2) / 2,
						{ tl: cr1, tr: cr1, bl: 0, br: 0 },
						[ 0xFFFFFF, 0xFFFFFF ], highlightAlphas,
						verticalGradientMatrix(1, 1, w - 2, (h - 2) / 2)); 
				}
				break;
			}
						
			case "overSkin":
			{
				var overFillColors:Array;
				if (fillColors.length > 2)
					overFillColors = [ fillColors[2], fillColors[3] ];
				else
					overFillColors = [ fillColors[0], fillColors[1] ];

				var overFillAlphas:Array;
				if (fillAlphas.length > 2)
					overFillAlphas = [ fillAlphas[2], fillAlphas[3] ];
  				else
					overFillAlphas = [ fillAlphas[0], fillAlphas[1] ];

				// button border/edge
				drawRoundRect(
					0, 0, w, h, cr,
					[ themeColor, themeColorDrk1 ], 1,
					verticalGradientMatrix(0, 0, w, h),
					GradientType.LINEAR, null, 
					{ x: 1, y: 1, w: w - 2, h: h - 2, r: cornerRadius - 1 }); 
												
				// button fill
				drawRoundRect(
					1, 1, w - 2, h - 2, cr1,
					overFillColors, overFillAlphas,
					verticalGradientMatrix(1, 1, w - 2, h - 2)); 
										  
				// top highlight
				drawRoundRect(
					1, 1, w - 2, (h - 2) / 2,
					{ tl: cr1, tr: cr1, bl: 0, br: 0 },
					[ 0xFFFFFF, 0xFFFFFF ], highlightAlphas,
					verticalGradientMatrix(1, 1, w - 2, (h - 2) / 2)); 
				
				break;
			}
									
			case "downSkin":
			case "selectedDownSkin":
			{
				// button border/edge
				drawRoundRect(
					0, 0, w, h, cr,
					[ themeColor, themeColorDrk1 ], 1,
					verticalGradientMatrix(0, 0, w, h )); 
												
				// button fill
				drawRoundRect(
					1, 1, w - 2, h - 2, cr1,
					[ derStyles.fillColorPress1, derStyles.fillColorPress2], 1,
					verticalGradientMatrix(1, 1, w - 2, h - 2)); 
										  
				// top highlight
				drawRoundRect(
					2, 2, w - 4, (h - 4) / 2,
					{ tl: cr2, tr: cr2, bl: 0, br: 0 },
					[ 0xFFFFFF, 0xFFFFFF ], highlightAlphas,
					verticalGradientMatrix(1, 1, w - 2, (h - 2) / 2)); 
				
				break;
			}
						
			case "disabledSkin":
			case "selectedDisabledSkin":
			{
   				var disFillColors:Array = [ fillColors[0], fillColors[1] ];
   				
				var disFillAlphas:Array =
					[ Math.max( 0, fillAlphas[0] - 0.15),
					  Math.max( 0, fillAlphas[1] - 0.15) ];

				// button border/edge
				drawRoundRect(
					0, 0, w, h, cr,
					[ borderColor, borderColorDrk1 ], 0.5,
					verticalGradientMatrix(0, 0, w, h ),
					GradientType.LINEAR, null, 
					{ x: 1, y: 1, w: w - 2, h: h - 2, r: cornerRadius - 1 });

				// button fill
				drawRoundRect(
					1, 1, w - 2, h - 2, cr1,
					disFillColors, disFillAlphas,
					verticalGradientMatrix(1, 1, w - 2, h - 2)); 
				
				break;
			}
		}
	}
}

}
