CodeEditor.cs :  » GUI » Paint.net » PaintDotNet » Effects » C# / CSharp Open Source

/////////////////////////////////////////////////////////////////////////////////
// Paint.NET                                                                   //
// Copyright (C) Rick Brewster, Tom Jackson, and past contributors.            //
// Portions Copyright (C) Microsoft Corporation. All Rights Reserved.          //
// See src/Setup/License.txt for full licensing and attribution details.       //
// 2                                                                           //
// 1                                                                           //
/////////////////////////////////////////////////////////////////////////////////

using System;
using System.Windows.Forms;

namespace PaintDotNet.Effects{
  public class CodeEditor : TextBox
  {
        private Timer compileTimer;

    public CodeEditor()
    {
      this.AcceptsReturn = true;
      this.AcceptsTab = true;    
      this.Multiline = true;
      this.ScrollBars = ScrollBars.Vertical;
      this.Font = new System.Drawing.Font("Courier New", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));

            this.compileTimer = new Timer();
            this.compileTimer.Interval = 500;
            this.compileTimer.Enabled = false;
            this.compileTimer.Tick += new EventHandler(compileTimer_Tick);
    }

        public event EventHandler CompileTimeHint;
        protected virtual void OnCompileTimeHint()
        {
            if (CompileTimeHint != null)
            {
                CompileTimeHint(this, EventArgs.Empty);
            }
        }

    protected override void OnKeyPress(KeyPressEventArgs e)
    {
      if (e.KeyChar == '\r')
      {
        int count = 0;
        int end = this.SelectionStart;
        string text = this.Text, indent = "\r\n";
        for (int i = 0; i < end; i++) 
        {
          if (text[i] == '(' || text[i] == '[' || text[i] == '{') 
          {
            count++;
          }
          if (text[i] == ')' || text[i] == ']' || text[i] == '}') 
          {
            count--;
          }
        }

        while (count-- > 0)
        {
          indent += "    ";
        }

        this.SelectedText = indent;
        e.Handled = true;
      }

            this.compileTimer.Enabled = false;
            this.compileTimer.Enabled = true;

      base.OnKeyPress (e);
    }

    public void Highlight(int line, int column) 
    {
            int startIndex = 0;
            int endIndex = -1;
            int linesPassed = 0;
            string txt = this.Text;

            for (int i = 0; i < txt.Length; ++i)
            {
                if (txt[i] == '\n')
                {
                    linesPassed++;

                    if (linesPassed == line - 1)
                    {
                        startIndex = i + column;
                    }
                    else if (linesPassed == line)
                    {
                        endIndex = i - 1;
                    }
                }
            }

            if (startIndex > 0 && endIndex > 0)
            {
                this.Select(startIndex, endIndex - startIndex);
            }
        }

        private void compileTimer_Tick(object sender, EventArgs e)
        {
            OnCompileTimeHint();
            this.compileTimer.Enabled = false;
        }
    }
}