gistfile1.txt

using System;

namespace ActionLib.Display
{
	internal class TextFitAutoScale
	{
		private readonly TextBase _field;
		
		private bool _defaultValuesSet = false;
		private float _defaultFontScale;
		private VAlign _defaultVAlign;
		
		public TextFitAutoScale(TextBase field)
		{
			_field = field;
		}
		
		public void apply()
		{
			restoreDefaultValues();
			
			if (_field is TextLabel)
				adjustSingleLine();
			else
				adjustMultiLine();
		}

		void adjustSingleLine()
		{
			var owerflow = Math.Max(
				_field.textWidth / _field.width,
				_field.textHeight / _field.height);

			if (owerflow > 1)
			{
				saveDefaultValues();
				_field.fontScale /= owerflow;
				_field.vAlignment = VAlign.MIDDLE;
			}	
		}

		void adjustMultiLine()
		{
			var scaleStep = 0.05f * _field.fontScale;
			
			while (true)
			{
				if (_field.textHeight <= _field.height && _field.textWidth <= _field.width)
					break;
				
				if (_field.fontScale - scaleStep <= 0)
					break;
				
				if (!_defaultValuesSet)
					saveDefaultValues();
					
				_field.fontScale -= scaleStep;
			}
		}
		
		public void reset()
		{
			restoreDefaultValues();
			_defaultValuesSet = false;
		}
		
		void restoreDefaultValues()
		{
			if (_defaultValuesSet)
			{
				_field.fontScale = _defaultFontScale;
				_field.vAlignment = _defaultVAlign;
			}
		}
		
		void saveDefaultValues()
		{
			if (!_defaultValuesSet)
			{
				_defaultFontScale = _field.fontScale;
				_defaultVAlign = _field.vAlignment;
				_defaultValuesSet = true;
			}
		}		
	}
}