MarkdownEditor.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;
using System.Windows.Forms.Integration;
using System.Windows.Input;

using ICSharpCode.AvalonEdit;

namespace MEditor
{
	public class MarkdownEditor
	{
		
		private WebBrowser _previewBrowser;
		

		private bool alreadyUpdate = false;
		private bool _isOpen = false;

		public bool AlreadyUpdate
		{
			get { return alreadyUpdate; }
			set { alreadyUpdate = value; }
		}

		private string _file = "";

		public string FileName
		{
			get { return _file; }
			set { _file = value; }
		}
		private frmMain _thisForm;

		private TextEditor _markdownRtb;
		//        private RichTextBox _htmlRtb;

		private TabPage _markdownPage;

		public TabPage MarkdownPage
		{
			get { return _markdownPage; }
			set { _markdownPage = value; }
		}
		public MarkdownEditor(frmMain thisform, TabPage page,WebBrowser preview)
		{
			this._markdownPage = page;
			this._thisForm = thisform;
			this._previewBrowser=preview;

			createRTB(ref _markdownRtb);
			_markdownRtb.TextChanged += new EventHandler(_markdownRtb_TextChanged);
			ElementHost elementHost = new ElementHost();
			elementHost.Child=_markdownRtb;
			elementHost.Dock=DockStyle.Fill;
			page.Controls.Add(elementHost);
			
	
		}

		private void createRTB(ref TextEditor htmlRtb)
		{
			htmlRtb = new TextEditor();
			//_htmlRtb.BackColor = bg ;
			//_htmlRtb.ForeColor =fore;
//			htmlRtb.WordWrap = false;
			htmlRtb.AllowDrop = false;
//			htmlRtb.ScrollBars = RichTextBoxScrollBars.Both;
			//htmlRtb.Dock = DockStyle.Fill;
			
			htmlRtb.TabIndex = 0;

//			htmlRtb.AcceptsTab = true;
//			htmlRtb.BulletIndent = 4;
//			htmlRtb.DetectUrls = false;

//			htmlRtb.ZoomFactor = 1.0f;
//
//			htmlRtb.EnableAutoDragDrop = false;
//			htmlRtb.HideSelection = true;

			int lef = 60;// (int)getfontWeight(4, font);
//			htmlRtb.SelectionTabs = new int[] { lef, lef * 2, lef * 3, lef * 3, lef * 4 };
			//htmlRtb.TabIndent=4;
			

			htmlRtb.AllowDrop = true;
			//htmlRtb.KeyDown+=new System.Windows.Input.KeyEventHandler(htmlRtb_KeyDown);
			htmlRtb.TextChanged+= _markdownRtb_TextChanged;

			htmlRtb.DragEnter += new System.Windows.DragEventHandler(htmlRtb_DragEnter);
			htmlRtb.Drop += new System.Windows.DragEventHandler(htmlRtb_DragDrop);
			
			

		}

		void htmlRtb_DragDrop(object sender, System.Windows.DragEventArgs e)
		{
			Array arrayFileName = (Array)e.Data.GetData(DataFormats.FileDrop);

			string strFileName = arrayFileName.GetValue(0).ToString();


			string[] data = (string[])e.Data.GetData(DataFormats.FileDrop);
			_thisForm.openfiles(data);

		}

		void htmlRtb_DragEnter(object sender, System.Windows.DragEventArgs e)
		{

			if (e.Data.GetDataPresent(DataFormats.FileDrop))
			{
				e.Effects = System.Windows.DragDropEffects.Link;
			}
			else
			{
				e.Effects = System.Windows.DragDropEffects.None;
			}

		}

		void htmlRtb_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
		{
			TextEditor rtb = ((TextEditor)sender);
			if (e.KeyStates == Keyboard.GetKeyStates(Key.V) && Keyboard.Modifiers == ModifierKeys.Control)
			{
				rtb.Paste();
				e.Handled = true;
				return;
			}

			if (e.KeyStates == Keyboard.GetKeyStates(Key.Tab))
				return;

			if (e.KeyStates == Keyboard.GetKeyStates(Key.LeftShift))
			{
				//如果特择了多行，则每行前加入一个\t
				string text = rtb.SelectedText;

				int st = rtb.SelectionStart;
				int st1 = rtb.Text.LastIndexOf("\n", st);
				st1 = st1 > -1 ? st1 : 0;
				int olen = rtb.SelectionLength;
				int len = st - st1 + rtb.SelectionLength;
				rtb.SelectionStart = st1;
				rtb.SelectionLength = len;
				text = rtb.SelectedText;

				text = text.Replace("\n\t", "\n");

				rtb.SelectedText = text;
				rtb.SelectionStart = st + 1;
				len=olen + text.Length - len - 1;
				if(len>0)
					rtb.SelectionLength = len;
			}
			else
			{
				//如果特择了多行，则每行前加入一个\t
				string text = rtb.SelectedText;
				if (text.IndexOf("\n") != -1)
				{
					int st = rtb.SelectionStart;
					if (st > 0)
					{
						int st1 = rtb.Text.LastIndexOf("\n", st);
						st1 = st1 > -1 ? st1 : 0;
						int olen = rtb.SelectionLength;
						int len = st - st1 + rtb.SelectionLength;
						rtb.SelectionStart = st1;
						rtb.SelectionLength = len;
						text = rtb.SelectedText;
						//text = rtb.Text.Substring(st1, len );

						text = text.Replace("\n", "\n\t");
						rtb.SelectedText = text;
						rtb.SelectionStart = st + 1;
						rtb.SelectionLength = olen + text.Length - len - 1;
					}
					
				}
				else
				{
					//rtb.SelectedText = "    ";
					return;
				}
			}

			e.Handled = true;
		}

		public TextEditor GetTextBox()
		{
			return _markdownRtb;
		}

		void _markdownRtb_TextChanged(object sender, EventArgs e)
		{

			//_previewBrowser.DocumentText=Utils.ConvertTextToHTML(_markdownRtb.Text);
			invokeScript("loadMarkdown", Utils.ConvertTextToHTML(_markdownRtb.Text));
		}
		
		public string GetMarkdown()
		{
			return _markdownRtb.Text;
		}
		
		
		
		public void invokeScript(string scriptName, string html)
		{
			
			try
			{
				this._previewBrowser.Document.InvokeScript(scriptName, new string[] { html });
			}
			catch (COMException)
			{
				string text = Utils.AppendValidHTMLTags(html, "", true);
				this._previewBrowser.DocumentText=text;
			}
			
		}

		
		

		public bool Openfile(string file)
		{
					string text = Utils.AppendValidHTMLTags(Utils.ConvertTextToHTML(_markdownRtb.Text), file, true);
			
			_previewBrowser.DocumentText=text;
			if (string.IsNullOrEmpty(file))
			{
				
				return true;
			}

			_file = file;
			if (!File.Exists(file))
				return true;
			try
			{
				_isOpen = true;
				StreamReader sr = new StreamReader(file, Encoding.UTF8);
				this._markdownRtb.Text = sr.ReadToEnd();
				sr.Close();
				sr.Dispose();
				

				_isOpen = false;

				return true;
			}
			catch
			{
				return false;
			}
		}

		public void Save(string file)
		{
			this._file = file;
			Save();
		}

		public void Save()
		{
			if (string.IsNullOrEmpty(_file))
				return;

			StreamWriter sw = new StreamWriter(_file,false, Encoding.UTF8);
			sw.Write(this._markdownRtb.Text);
			//this._markdownRtb.SaveFile(sw, RichTextBoxStreamType.PlainText);
			sw.Close();
			sw.Dispose();
			alreadyUpdate = false;

			FileInfo fileInfo = new FileInfo(FileName);

			_markdownPage.Text = fileInfo.Name;
			_markdownPage.ToolTipText = FileName;
		}

		public void SetStyle(Color bg, Color fore, Font font, bool wordWrap,int tabWidth)
		{
			_isOpen = true;
			TextEditor rtb = GetTextBox();

//			if (rtb.BackColor != bg)
//				rtb.BackColor = bg;
//			if (rtb.ForeColor != fore)
//				rtb.ForeColor = fore;
//			if (rtb.Font != font)
//				rtb.Font = font;
			
			if (rtb.WordWrap != wordWrap)
				rtb.WordWrap = wordWrap;
			
			_isOpen = false;
		}

		private float getfontWeight(int width,Font font)
		{
			Graphics g = _thisForm.CreateGraphics();
			SizeF sizeF = g.MeasureString("A",font );
			return sizeF.Width * width;
		}
	}
}