package com.yahoo.renderers.layout

{

import flash.display.DisplayObject;

import flash.display.DisplayObjectContainer;

import com.yahoo.renderers.events.LayoutEvent;

public class HFlowLayout extends LayoutStrategy

{

/**

* Constructor

*/

public function HFlowLayout()

{

super();

this.setStyle("sizeMode", ContainerType.VBOX);

}

/**

* @private

*/

override public function set container(value:DisplayObjectContainer):void

{

super.container = value;

}

/**

* @private

*/

private var _rows:Array;

/**

* @inheritDoc

*/

override public function layoutChildren():void

{

super.layoutChildren();

this.measureContent();

var len:Number = this._rows.length;

var childY:Number = this._topPadding;

var childX:Number = 0;

var child:DisplayObject;

for(var i:int = 0; i < len; i++)

{

var row:Object = this._rows[i];

var padding:Number = this._leftPadding;

if(this._horizontalAlign == "center")

{

padding = (this.container.width - row.width)/2;

}

else if(this._horizontalAlign == "right")

{

padding += this.container.width - (this._rightPadding + row.width);

}

if(!isNaN(padding)) childX = padding;

var items:Array = row.items as Array;

var rowLen:int = items.length;

for(var j:int = 0; j < rowLen; j++)

{

child = items[j] as DisplayObject;

child.y = childY;

child.x = childX;

childX = child.x + child.width + this._horizontalGap;

}

childY += this._verticalGap + row.height;

}

}

/**

* @private

*/

override public function measureContent():void

{

var oldWidth:Number = this._contentWidth;

var oldHeight:Number = this._contentHeight;

var rows:Array = new Array();

var children:Array = this.items;

var len:int = children.length;

var padding:Number = this._horizontalAlign == "center" ? 0 : (this._leftPadding + this._rightPadding);

var row:Object = {items:[], height:0, width:(padding - this._horizontalGap)};

rows.push(row);

var child:DisplayObject;

this._contentHeight = this._topPadding - this._verticalGap;

for(var i:int = 0; i < len; i++)

{

child = children[i] as DisplayObject;

if((row.width + child.width) <= this.container.width)

{

row.items.push(child);

row.width += child.width + this._horizontalGap;

row.height = Math.max(row.height, child.height);

}

else

{

row = {items:[child], height:child.height, width:(padding + child.width)};

rows.push(row);

}

this._contentHeight += child.height + this._verticalGap;

}

this._contentHeight += this._bottomPadding;

this._rows = rows;

if(this._contentWidth != oldWidth) this.dispatchEvent(new LayoutEvent(LayoutEvent.CONTENT_WIDTH_UPDATE));

if(this._contentHeight != oldHeight) this.dispatchEvent(new LayoutEvent(LayoutEvent.CONTENT_HEIGHT_UPDATE));

}

}

}