datepositionconverter.as

flex的一些小例子

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@ignore
*/package flexlib.scheduling.scheduleClasses.utils
{
	/**
	 * @private
	 * Provide methods to convert pixel positions 
	 * to dates and vice versa 
	 */	
	public class DatePositionConverter
	{
		public var startDateMilliseconds : Number;
		public var totalWidth : Number;
		public var totalMilliseconds : Number;
		
		public function positionToMilliseconds( position : Number ) : Number
		{
			return position / totalWidth * totalMilliseconds;
		}
		
		public function millisecondsToPosition( milliseconds : Number ) : Number
		{
			return milliseconds / totalMilliseconds * totalWidth;	
		}

		public function positionToMillisecondsAbsolute( position : Number ) : Number
		{
			return startDateMilliseconds + positionToMilliseconds( position );
		}
		
		public function millisecondsToPositionAbsolute( milliseconds : Number ) : Number
		{
			return millisecondsToPosition( milliseconds - startDateMilliseconds );	
		}

		public function positionToDate( position : Number ) : Date
		{
			return new Date( positionToMillisecondsAbsolute( position ));
		}
		
		public function dateToPosition( date : Date ) : Number
		{
			return millisecondsToPositionAbsolute( date.getTime() );
		}


		public function toString() : String 
		{
			return "[object DatePositionConverter"
				+ " startDateMilliseconds:" + startDateMilliseconds
				+ " totalWidth:" + totalWidth
				+ " totalMilliseconds:" + totalMilliseconds
			    + "]";
		}	
	}
}