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A Professional HTML Renderer You Will Use

, 29 Jan 2009 BSD
100% managed code that draws HTML on any device
HtmlDemo.002.zip
System.Drawing.Html.dll
Html Demo.exe
HtmlDemo.zip
System.Drawing.Html.dll
Html Demo.exe
System.Drawing.Html.002.zip
System.Drawing.Html
Html Demo
bin
Debug
Html Demo.exe
Html Demo.vshost.exe
HtmlDemo.zip
System.Drawing.Html.dll
Html Demo.csproj.user
Properties
Settings.settings
Resources
comment16.gif
delete16.gif
delete32.gif
exclamation32.png
favorites32.png
font32.png
formula32.png
image32.png
method16.gif
paly32.png
property16.gif
property32.png
refreshdocument32.png
web_pallete.gif
Window.gif
Samples
System.Drawing.Html.suo
System.Drawing.Html
bin
Debug
System.Drawing.Html.dll
System.Drawing.Html.vshost.exe
Properties
Settings.settings
System.Drawing.Html.zip
Html Demo.exe
Html Demo.vshost.exe
System.Drawing.Html.dll
Html Demo.csproj.user
Settings.settings
comment16.gif
delete16.gif
delete32.gif
exclamation32.png
favorites32.png
font32.png
formula32.png
image32.png
method16.gif
paly32.png
property16.gif
property32.png
refreshdocument32.png
web_pallete.gif
Window.gif
System.Drawing.Html.suo
System.Drawing.Html.dll
System.Drawing.Html.vshost.exe
Settings.settings
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Reflection;
using System.ComponentModel;
using System.Drawing.Design;
using System.Drawing.Html;
using System.Drawing;

namespace System.Windows.Forms
{
    public class HtmlPanel
        : ScrollableControl
    {
        #region Fields
        protected InitialContainer _htmlContainer;

        #endregion

        #region Ctor

        /// <summary>
        /// Creates a new HtmlPanel
        /// </summary>
        public HtmlPanel()
        {
            _htmlContainer = new InitialContainer();

            SetStyle(ControlStyles.ResizeRedraw, true);
            SetStyle(ControlStyles.Opaque, true);
            //SetStyle(ControlStyles.Selectable, true);

            DoubleBuffered = true;

            BackColor = SystemColors.Window;
            AutoScroll = true;

            HtmlRenderer.AddReference(Assembly.GetCallingAssembly());
        }

        #endregion

        #region Properties

        [DesignerSerializationVisibility( DesignerSerializationVisibility.Visible)]
        public override bool AutoSize
        {
            get
            {
                return base.AutoSize;
            }
            set
            {
                base.AutoSize = value;
            }
        }

        [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
        public override bool AutoScroll
        {
            get
            {
                return base.AutoScroll;
            }
            set
            {
                base.AutoScroll = value;
            }
        }

        /// <summary>
        /// Gets the Initial HtmlContainer of this HtmlPanel
        /// </summary>
        public InitialContainer HtmlContainer
        {
            get { return _htmlContainer; }
        }

        /// <summary>
        /// Gets or sets the text of this panel
        /// </summary>
        [Editor("System.Windows.Forms.Design.ListControlStringCollectionEditor, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor)), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Visible), Localizable(true), Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]
        public override string Text
        {
            get
            {
                return base.Text;
            }
            set
            {
                base.Text = value;

                CreateFragment();
                MeasureBounds();
                Invalidate();
            }
        }

        #endregion

        #region Methods

        /// <summary>
        /// Creates the fragment of HTML that is rendered
        /// </summary>
        protected virtual void CreateFragment()
        {
            _htmlContainer = new InitialContainer(Text);
        }

        /// <summary>
        /// Measures the bounds of the container
        /// </summary>
        public virtual void MeasureBounds()
        {
            _htmlContainer.SetBounds(this is HtmlLabel ? new Rectangle(0, 0, 10, 10) : ClientRectangle);

            using (Graphics g = CreateGraphics())
            {
                _htmlContainer.MeasureBounds(g);
            }
            
            AutoScrollMinSize = Size.Round(_htmlContainer.MaximumSize);
        }

        protected override void OnClick(EventArgs e)
        {
            base.OnClick(e);

            Focus();
        }

        protected override void OnResize(EventArgs e)
        {
            base.OnResize(e);

            MeasureBounds();
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);

            if (!(this is  HtmlLabel)) e.Graphics.Clear(SystemColors.Window);

            
            _htmlContainer.ScrollOffset = AutoScrollPosition;
            e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
            _htmlContainer.Paint(e.Graphics);

        }

        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);

            foreach (CssBox box in _htmlContainer.LinkRegions.Keys)
            {
                RectangleF rect = _htmlContainer.LinkRegions[box];
                if (Rectangle.Round(rect).Contains(e.X, e.Y))
                {
                    Cursor = Cursors.Hand;
                    return;
                }
            }

            Cursor = Cursors.Default;
        }

        protected override void OnMouseClick(MouseEventArgs e)
        {
            base.OnMouseClick(e);

            foreach (CssBox box in _htmlContainer.LinkRegions.Keys)
            {
                RectangleF rect = _htmlContainer.LinkRegions[box];
                if (Rectangle.Round(rect).Contains(e.X, e.Y))
                {
                    CssValue.GoLink(box.GetAttribute("href", string.Empty));
                    return;
                }
            }

        }

        #endregion
    }
}

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License

This article, along with any associated source code and files, is licensed under The BSD License

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About the Author

Jose Menendez Póo
Team Leader
Mexico Mexico
I'm in game programming now: https://itunes.apple.com/us/app/ugly-aliens-training-center/id859271884?ls=1&mt=8
 
Jose Manuel Menéndez Poó
 
- I've been programming Windows and Web apps since 1997.
- My greatest concern nowadays is user interface usability.
 
Questions and stuff by twitter: @menendezpoo
 
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