using System;

using System.Drawing;

using System.Drawing.Drawing2D;



namespace HenIT.Runtime.InteropServices.APIs

{

	/// <summary>

	/// Summary description for TextUtil.

	/// </summary>

	public class TextUtil

	{

		#region Constructor

		// No need to construct this object

		private TextUtil()

		{

		}

		#endregion



		#region Methods

		public static Size GetTextSize(Graphics graphics, string text, Font font)

		{

			IntPtr hdc = IntPtr.Zero;

			if ( graphics != null )

			{

				// Get device context from the graphics passed in

				hdc = graphics.GetHdc();

			}

			else

			{

				// Get screen device context

                hdc = APIsGdi.GetDC(IntPtr.Zero);

			}



			IntPtr fontHandle = font.ToHfont();

			IntPtr currentFontHandle = APIsGdi.SelectObject(hdc, fontHandle);

			

			APIsStructs.RECT rect = new APIsStructs.RECT();

			rect.left = 0;

			rect.right = 0;

			rect.top = 0;

			rect.bottom = 0;

		

			APIsUser32.DrawText(hdc, text, text.Length, ref rect, 

				APIsEnums.DrawTextFormatFlags.SINGLELINE | APIsEnums.DrawTextFormatFlags.LEFT | APIsEnums.DrawTextFormatFlags.CALCRECT);

			APIsGdi.SelectObject(hdc, currentFontHandle);

			APIsGdi.DeleteObject(fontHandle);



			if(graphics != null)

				graphics.ReleaseHdc(hdc);

			else

				APIsUser32.ReleaseDC(IntPtr.Zero, hdc);

							

			return new Size(rect.right - rect.left, rect.bottom - rect.top);

		}



		public static Size GetTextSize(Graphics graphics, string text, Font font, ref Rectangle rc, APIsEnums.DrawTextFormatFlags drawFlags)

		{

			IntPtr hdc = IntPtr.Zero;

			if ( graphics != null )

			{

				// Get device context from the graphics passed in

				hdc = graphics.GetHdc();

			}

			else

			{

				// Get screen device context

				hdc = APIsGdi.GetDC(IntPtr.Zero);

			}



			IntPtr fontHandle = font.ToHfont();

			IntPtr currentFontHandle = APIsGdi.SelectObject(hdc, fontHandle);

			

			APIsStructs.RECT rect = new APIsStructs.RECT();

			rect.left = rc.Left;

			rect.right = rc.Right;

			rect.top = rc.Top;

			rect.bottom = rc.Bottom;

		

			APIsUser32.DrawText(hdc, text, text.Length, ref rect, drawFlags);

			APIsGdi.SelectObject(hdc, currentFontHandle);

			APIsGdi.DeleteObject(fontHandle);



			if(graphics != null)

				graphics.ReleaseHdc(hdc);

			else

				APIsUser32.ReleaseDC(IntPtr.Zero, hdc);

							

			return new Size(rect.right - rect.left, rect.bottom - rect.top);

			

		}



		public static void DrawText(Graphics graphics, string text, Font font, Rectangle rect)

		{

			IntPtr hdc = graphics.GetHdc();

			IntPtr fontHandle = font.ToHfont();

			IntPtr currentFontHandle = APIsGdi.SelectObject(hdc, fontHandle);

			APIsGdi.SetBkMode(hdc, APIsEnums.BackgroundMode.TRANSPARENT);

           						

            APIsStructs.RECT rc = new APIsStructs.RECT();

			rc.left = rect.Left;

			rc.top = rect.Top;

			rc.right = rc.left + rect.Width;

			rc.bottom = rc.top + rect.Height;

			

			APIsUser32.DrawText(hdc, text, text.Length, ref rc, 

				APIsEnums.DrawTextFormatFlags.SINGLELINE | APIsEnums.DrawTextFormatFlags.LEFT 

				| APIsEnums.DrawTextFormatFlags.MODIFYSTRING | APIsEnums.DrawTextFormatFlags.WORD_ELLIPSIS);

			APIsGdi.SelectObject(hdc, currentFontHandle);

			APIsGdi.DeleteObject(fontHandle);

			graphics.ReleaseHdc(hdc);

		}



		public static void DrawText(Graphics graphics, string text, Font font, Rectangle rect, Color textColor)

		{

			IntPtr hdc = graphics.GetHdc();

			IntPtr fontHandle = font.ToHfont();

			IntPtr currentFontHandle = APIsGdi.SelectObject(hdc, fontHandle);

			uint colorRef = ColorUtil.GetCOLORREF(textColor);

			APIsGdi.SetTextColor(hdc, colorRef);

			APIsGdi.SetBkMode(hdc, APIsEnums.BackgroundMode.TRANSPARENT);

           						

			APIsStructs.RECT rc = new APIsStructs.RECT();

			rc.left = rect.Left;

			rc.top = rect.Top;

			rc.right = rc.left + rect.Width;

			rc.bottom = rc.top + rect.Height;

			

			APIsUser32.DrawText(hdc, text, text.Length, ref rc, 

				APIsEnums.DrawTextFormatFlags.SINGLELINE | APIsEnums.DrawTextFormatFlags.LEFT

				| APIsEnums.DrawTextFormatFlags.MODIFYSTRING| APIsEnums.DrawTextFormatFlags.WORD_ELLIPSIS);

			APIsGdi.SelectObject(hdc, currentFontHandle);

			APIsGdi.DeleteObject(fontHandle);

			graphics.ReleaseHdc(hdc);

		}



		public static void DrawReverseString(Graphics g, 

			String drawText, 

			Font drawFont, 

			Rectangle drawRect,

			Brush drawBrush,

			StringFormat drawFormat)

		{

			GraphicsContainer container = g.BeginContainer();



			// The text will be rotated around the origin (0,0) and so needs moving

			// back into position by using a transform

			g.TranslateTransform(drawRect.Left * 2 + drawRect.Width, 

				drawRect.Top * 2 + drawRect.Height);



			// Rotate the text by 180 degress to reverse the direction 

			g.RotateTransform(180);



			// Draw the string as normal and let then transforms do the work

			g.DrawString(drawText, drawFont, drawBrush, drawRect, drawFormat);



			g.EndContainer(container);

		}



		#endregion

	}

}