/// <summary>
/// Measure the size (width and height) required to draw the given html under given width and height restrictions.<br/>
/// </summary>
/// <param name="g">Device to use for measure</param>
/// <param name="html">HTML source to render</param>
/// <param name="maxWidth">optional: bound the width of the html to render in (default - 0, unlimited)</param>
/// <param name="maxHeight">optional: bound the height of the html to render in (default - 0)</param>
/// <param name="cssData">optiona: the style to use for html rendering (default - use W3 default style)</param>
/// <param name="bridge">optional: used to resolve external references in html code (property, method calls)</param>
/// <returns>the size required for the html</returns>
public static SizeF Measure(Graphics g, string html, float maxWidth = 0, float maxHeight = 0, CssData cssData = null, object bridge = null)
{
ArgChecker.AssertArgNotNull(g, "g");
SizeF actualSize = SizeF.Empty;
if (!string.IsNullOrEmpty(html))
{
var container = new HtmlContainer(html, bridge, cssData);
container.MaxSize = new SizeF(maxWidth, maxHeight);
container.PerformLayout(g);
actualSize = container.ActualSize;
}
return actualSize;
}
/// <summary>
/// Creates a new HTML Label
/// </summary>
public HtmlLabel()
{
SuspendLayout();
AutoSize = true;
BackColor = SystemColors.Window;
DoubleBuffered = true;
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.SupportsTransparentBackColor, true);
SetStyle(ControlStyles.Opaque, false);
_htmlContainer = new HtmlContainer();
_htmlContainer.AvoidImagesLateLoading = true;
_htmlContainer.MaxSize = MaximumSize;
_htmlContainer.LinkClicked += OnLinkClicked;
_htmlContainer.RenderError += OnRenderError;
_htmlContainer.Refresh += OnRefresh;
_htmlContainer.StylesheetLoad += OnStylesheetLoad;
_htmlContainer.ImageLoad += OnImageLoad;
ResumeLayout(false);
}
/// <summary>
/// Init.
/// </summary>
public HtmlToolTip()
{
OwnerDraw = true;
_htmlContainer = new HtmlContainer();
_htmlContainer.IsSelectionEnabled = false;
_htmlContainer.IsContextMenuEnabled = false;
_htmlContainer.AvoidGeometryAntialias = true;
_htmlContainer.AvoidImagesLateLoading = true;
_htmlContainer.LinkClicked += OnLinkClicked;
_htmlContainer.RenderError += OnRenderError;
_htmlContainer.Refresh += OnRefresh;
_htmlContainer.StylesheetLoad += OnStylesheetLoad;
_htmlContainer.ImageLoad += OnImageLoad;
Popup += OnToolTipPopup;
Draw += OnToolTipDraw;
Disposed += OnToolTipDisposed;
_linkHandlingTimer = new Timer();
_linkHandlingTimer.Tick += OnLinkHandlingTimerTick;
_linkHandlingTimer.Interval = 40;
}
private void OnToolTipPopup(object sender, PopupEventArgs e)
{
string text = GetToolTip(e.AssociatedControl);
string font = string.Format(NumberFormatInfo.InvariantInfo, "font: {0}pt {1}", e.AssociatedControl.Font.Size, e.AssociatedControl.Font.FontFamily.Name);
//Create fragment container
_htmlContainer = new HtmlContainer();
_htmlContainer.AvoidGeometryAntialias = true;
_htmlContainer.LinkClicked += OnLinkClicked;
_htmlContainer.RenderError += OnRenderError;
_htmlContainer.Refresh += OnRefresh;
_htmlContainer.StylesheetLoad += OnStylesheetLoad;
_htmlContainer.ImageLoad += OnImageLoad;
_htmlContainer.SetHtml("<div><table class=htmltooltipbackground cellspacing=5 cellpadding=0 style=\"" + font + "\"><tr><td style=border:0px>" + text + "</td></tr></table></div>");
//Measure bounds of the container
using (Graphics g = e.AssociatedControl.CreateGraphics())
{
_htmlContainer.PerformLayout(g);
}
//Set the size of the tooltip
e.ToolTipSize = new Size((int)Math.Round(_htmlContainer.ActualSize.Width, MidpointRounding.AwayFromZero), (int)Math.Round(_htmlContainer.ActualSize.Height, MidpointRounding.AwayFromZero));
}
/// <summary>
/// Renders the specified HTML into image of unknown size that will be determined by max width/height and HTML layout.<br/>
/// If <paramref name="maxWidth"/> is zero the html will use all the required width, otherwise it will perform line
/// wrap as specified in the html<br/>
/// If <paramref name="maxHeight"/> is zero the html will use all the required height, otherwise it will clip at the
/// given max height not rendering the html below it.<br/>
/// </summary>
/// <param name="html">HTML source to render</param>
/// <param name="maxWidth">the max width of the rendered html</param>
/// <param name="maxHeight">optional: the max height of the rendered html, if above zero it will be clipped</param>
/// <param name="cssData">optiona: the style to use for html rendering (default - use W3 default style)</param>
/// <param name="stylesheetLoad">optional: can be used to overwrite stylesheet resolution logic</param>
/// <param name="imageLoad">optional: can be used to overwrite image resolution logic</param>
/// <returns>the generated image of the html</returns>
public static Image RenderToImage(string html, int maxWidth, int maxHeight = 0, CssData cssData = null, EventHandler<HtmlStylesheetLoadEventArgs> stylesheetLoad = null, EventHandler<HtmlImageLoadEventArgs> imageLoad = null)
{
if (string.IsNullOrEmpty(html))
return new Bitmap(0, 0, PixelFormat.Format32bppArgb);
using (var htmlContainer = new HtmlContainer())
{
// use desktop created graphics to measure the HTML
using (var measureGraphics = Graphics.FromHwnd(IntPtr.Zero))
{
if (stylesheetLoad != null)
htmlContainer.StylesheetLoad += stylesheetLoad;
if (imageLoad != null)
htmlContainer.ImageLoad += imageLoad;
htmlContainer.SetHtml(html, cssData);
htmlContainer.PerformLayout(measureGraphics);
if (maxWidth > 0 && maxWidth < htmlContainer.ActualSize.Width)
{
// to allow the actual size be smaller than max we need to set max size only if it is really larger
htmlContainer.MaxSize = new SizeF(maxWidth, 0);
htmlContainer.PerformLayout(measureGraphics);
}
}
var size = new Size(maxWidth > 0 ? Math.Min(maxWidth, (int) htmlContainer.ActualSize.Width) : (int) htmlContainer.ActualSize.Width,
maxHeight > 0 ? Math.Min(maxHeight, (int) htmlContainer.ActualSize.Height) : (int) htmlContainer.ActualSize.Height);
// create the final image to render into by measured size
var image = new Bitmap(size.Width, size.Height, PixelFormat.Format32bppArgb);
// create memory buffer from desktop handle that supports alpha chanel
IntPtr dib;
var memoryHdc = Win32Utils.CreateMemoryHdc(IntPtr.Zero, image.Width, image.Height, out dib);
try
{
// render HTML into the memory buffer
using (var memoryGraphics = Graphics.FromHdc(memoryHdc))
{
memoryGraphics.Clear(Color.White);
htmlContainer.PerformPaint(memoryGraphics);
}
// copy from memory buffer to image
using (var imageGraphics = Graphics.FromImage(image))
{
var imgHdc = imageGraphics.GetHdc();
Win32Utils.BitBlt(imgHdc, 0, 0, image.Width, image.Height, memoryHdc, 0, 0, Win32Utils.BitBltCopy);
imageGraphics.ReleaseHdc(imgHdc);
}
}
finally
{
Win32Utils.ReleaseMemoryHdc(memoryHdc, dib);
}
return image;
}
}
/// <summary>
/// Renders the specified HTML into image of the requested size.<br/>
/// The HTML will be layout by the given size but will be clipped if cannot fit.
/// </summary>
/// <param name="html">HTML source to render</param>
/// <param name="size">The size of the image to render into, layout html by width and clipped by height</param>
/// <param name="cssData">optiona: the style to use for html rendering (default - use W3 default style)</param>
/// <param name="stylesheetLoad">optional: can be used to overwrite stylesheet resolution logic</param>
/// <param name="imageLoad">optional: can be used to overwrite image resolution logic</param>
/// <returns>the generated image of the html</returns>
public static Image RenderToImage(string html, Size size, CssData cssData = null, EventHandler<HtmlStylesheetLoadEventArgs> stylesheetLoad = null, EventHandler<HtmlImageLoadEventArgs> imageLoad = null)
{
// create the final image to render into
var image = new Bitmap(size.Width, size.Height, PixelFormat.Format32bppArgb);
if (!string.IsNullOrEmpty(html))
{
// create memory buffer from desktop handle that supports alpha chanel
IntPtr dib;
var memoryHdc = Win32Utils.CreateMemoryHdc(IntPtr.Zero, image.Width, image.Height, out dib);
try
{
// create memory buffer graphics to use for HTML rendering
using (var memoryGraphics = Graphics.FromHdc(memoryHdc))
{
memoryGraphics.Clear(Color.White);
// render HTML into the memory buffer
using (var htmlContainer = new HtmlContainer())
{
if (stylesheetLoad != null)
htmlContainer.StylesheetLoad += stylesheetLoad;
if (imageLoad != null)
htmlContainer.ImageLoad += imageLoad;
htmlContainer.SetHtml(html, cssData);
htmlContainer.MaxSize = size;
htmlContainer.PerformLayout(memoryGraphics);
htmlContainer.PerformPaint(memoryGraphics);
}
}
// copy from memory buffer to image
using (var imageGraphics = Graphics.FromImage(image))
{
var imgHdc = imageGraphics.GetHdc();
Win32Utils.BitBlt(imgHdc, 0, 0, image.Width, image.Height, memoryHdc, 0, 0, Win32Utils.BitBltCopy);
imageGraphics.ReleaseHdc(imgHdc);
}
}
finally
{
Win32Utils.ReleaseMemoryHdc(memoryHdc, dib);
}
}
return image;
}
/// <summary>
/// Renders the specified HTML source on the specified location and max size restriction.<br/>
/// If <paramref name="maxSize"/>.Width is zero the html will use all the required width, otherwise it will perform line
/// wrap as specified in the html<br/>
/// If <paramref name="maxSize"/>.Height is zero the html will use all the required height, otherwise it will clip at the
/// given max height not rendering the html below it.<br/>
/// Returned is the actual widht and height of the rendered html.<br/>
/// </summary>
/// <param name="g">Device to render with</param>
/// <param name="html">HTML source to render</param>
/// <param name="location">the top-left most location to start render the html at</param>
/// <param name="maxSize">the max size of the rendered html (if height above zero it will be clipped)</param>
/// <param name="cssData">optiona: the style to use for html rendering (default - use W3 default style)</param>
/// <param name="stylesheetLoad">optional: can be used to overwrite stylesheet resolution logic</param>
/// <param name="imageLoad">optional: can be used to overwrite image resolution logic</param>
/// <returns>the actual size of the rendered html</returns>
public static SizeF Render(Graphics g, string html, PointF location, SizeF maxSize, CssData cssData, EventHandler<HtmlStylesheetLoadEventArgs> stylesheetLoad, EventHandler<HtmlImageLoadEventArgs> imageLoad)
{
ArgChecker.AssertArgNotNull(g, "g");
SizeF actualSize = SizeF.Empty;
if (!string.IsNullOrEmpty(html))
{
Region prevClip = null;
if (maxSize.Height > 0)
{
prevClip = g.Clip;
g.SetClip(new RectangleF(location, maxSize));
}
using (var container = new HtmlContainer())
{
if (stylesheetLoad != null)
container.StylesheetLoad += stylesheetLoad;
if (imageLoad != null)
container.ImageLoad += imageLoad;
container.SetHtml(html, cssData);
container.Location = location;
container.MaxSize = maxSize;
container.PerformLayout(g);
container.PerformPaint(g);
if (prevClip != null)
{
g.SetClip(prevClip, CombineMode.Replace);
}
actualSize = container.ActualSize;
}
}
return actualSize;
}
/// <summary>
/// Measure the size (width and height) required to draw the given html under given width and height restrictions.<br/>
/// </summary>
/// <param name="g">Device to use for measure</param>
/// <param name="html">HTML source to render</param>
/// <param name="maxWidth">optional: bound the width of the html to render in (default - 0, unlimited)</param>
/// <param name="cssData">optiona: the style to use for html rendering (default - use W3 default style)</param>
/// <param name="stylesheetLoad">optional: can be used to overwrite stylesheet resolution logic</param>
/// <param name="imageLoad">optional: can be used to overwrite image resolution logic</param>
/// <returns>the size required for the html</returns>
public static SizeF Measure(Graphics g, string html, float maxWidth, CssData cssData, EventHandler<HtmlStylesheetLoadEventArgs> stylesheetLoad, EventHandler<HtmlImageLoadEventArgs> imageLoad)
{
ArgChecker.AssertArgNotNull(g, "g");
SizeF actualSize = SizeF.Empty;
if (!string.IsNullOrEmpty(html))
{
using (var container = new HtmlContainer())
{
if (stylesheetLoad != null)
container.StylesheetLoad += stylesheetLoad;
if (imageLoad != null)
container.ImageLoad += imageLoad;
container.SetHtml(html, cssData);
container.MaxSize = new SizeF(maxWidth, 0);
container.PerformLayout(g);
actualSize = container.ActualSize;
}
}
return actualSize;
}
private void OnToolTipPopup(object sender, PopupEventArgs e)
{
string text = GetToolTip(e.AssociatedControl);
string font = string.Format(NumberFormatInfo.InvariantInfo, "font: {0}pt {1}", e.AssociatedControl.Font.Size, e.AssociatedControl.Font.FontFamily.Name);
//Create fragment container
var documentSource = "<div><table class=htmltooltipbackground cellspacing=5 cellpadding=0 style=\"" + font + "\"><tr><td style=border:0px>" + text + "</td></tr></table></div>";
_container = new HtmlContainer(documentSource, Bridge);
_container.AvoidGeometryAntialias = true;
//Measure bounds of the container
using (Graphics g = e.AssociatedControl.CreateGraphics())
{
_container.PerformLayout(g);
}
//Set the size of the tooltip
e.ToolTipSize = new Size((int) Math.Round(_container.ActualSize.Width, MidpointRounding.AwayFromZero), (int) Math.Round(_container.ActualSize.Height, MidpointRounding.AwayFromZero));
}
/// <summary>
/// Creates new Html Container to handle the html in the control.
/// </summary>
private void CreateHtmlContainer()
{
if (_htmlContainer != null)
{
_htmlContainer.LinkClicked -= OnLinkClicked;
_htmlContainer = null;
}
_htmlContainer = new HtmlContainer(Text, Bridge, _baseCssData);
_htmlContainer.MaxSize = MaximumSize;
if (LinkClicked != null)
{
_htmlContainer.LinkClicked += OnLinkClicked;
}
}
/// <summary>
/// Release the html container resources.
/// </summary>
protected override void Dispose(bool disposing)
{
if (_htmlContainer != null)
{
_htmlContainer.LinkClicked -= OnLinkClicked;
_htmlContainer.RenderError -= OnRenderError;
_htmlContainer.Refresh -= OnRefresh;
_htmlContainer.StylesheetLoad -= OnStylesheetLoad;
_htmlContainer.ImageLoad -= OnImageLoad;
_htmlContainer.Dispose();
_htmlContainer = null;
}
base.Dispose(disposing);
}
/// <summary>
/// Creates a new HTML Label
/// </summary>
public HtmlLabel()
{
SuspendLayout();
AutoSize = true;
BackColor = SystemColors.Window;
DoubleBuffered = true;
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.SupportsTransparentBackColor, true);
SetStyle(ControlStyles.Opaque, false);
_htmlContainer = new HtmlContainer();
_htmlContainer.AvoidImagesLateLoading = true;
_htmlContainer.MaxSize = MaximumSize;
_htmlContainer.LinkClicked += OnLinkClicked;
_htmlContainer.RenderError += OnRenderError;
_htmlContainer.Refresh += OnRefresh;
_htmlContainer.StylesheetLoad += OnStylesheetLoad;
_htmlContainer.ImageLoad += OnImageLoad;
ResumeLayout(false);
}
/// <summary>
/// Creates a new HtmlPanel and sets a basic css for it's styling.
/// </summary>
public HtmlPanel()
{
AutoScroll = true;
BackColor = SystemColors.Window;
DoubleBuffered = true;
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.SupportsTransparentBackColor, true);
_htmlContainer = new HtmlContainer();
_htmlContainer.LinkClicked += OnLinkClicked;
_htmlContainer.RenderError += OnRenderError;
_htmlContainer.Refresh += OnRefresh;
_htmlContainer.ScrollChange += OnScrollChange;
_htmlContainer.StylesheetLoad += OnStylesheetLoad;
_htmlContainer.ImageLoad += OnImageLoad;
}
/// <summary>
/// Unsubscribe from events and dispose of <see cref="_htmlContainer"/>.
/// </summary>
private void OnToolTipDisposed(object sender, EventArgs eventArgs)
{
Popup -= OnToolTipPopup;
Draw -= OnToolTipDraw;
Disposed -= OnToolTipDisposed;
if(_htmlContainer != null)
{
_htmlContainer.LinkClicked -= OnLinkClicked;
_htmlContainer.RenderError -= OnRenderError;
_htmlContainer.Refresh -= OnRefresh;
_htmlContainer.StylesheetLoad -= OnStylesheetLoad;
_htmlContainer.ImageLoad -= OnImageLoad;
_htmlContainer.Dispose();
_htmlContainer = null;
}
if( _linkHandlingTimer != null )
{
_linkHandlingTimer.Dispose();
_linkHandlingTimer = null;
}
}
/// <summary>
/// Renders the specified HTML source on the specified location and max size restriction.<br/>
/// If <paramref name="maxSize"/>.Width is zero the html will use all the required width, otherwise it will perform line
/// wrap as specified in the html<br/>
/// If <paramref name="maxSize"/>.Height is zero the html will use all the required height, otherwise it will clip at the
/// given max height not rendering the html below it.<br/>
/// Returned is the actual widht and height of the rendered html.<br/>
/// </summary>
/// <param name="g">Device to render with</param>
/// <param name="html">HTML source to render</param>
/// <param name="location">the top-left most location to start render the html at</param>
/// <param name="maxSize">the max size of the rendered html (if height above zero it will be clipped)</param>
/// <param name="cssData">optiona: the style to use for html rendering (default - use W3 default style)</param>
/// <param name="bridge">optional: used to resolve external references in html code (property and method calls)</param>
/// <returns>the actual size of the rendered html</returns>
public static SizeF Render(Graphics g, string html, PointF location, SizeF maxSize, CssData cssData = null, object bridge = null)
{
ArgChecker.AssertArgNotNull(g, "g");
SizeF actualSize = SizeF.Empty;
if(!string.IsNullOrEmpty(html))
{
Region prevClip = null;
if (maxSize.Height > 0)
{
prevClip = g.Clip;
g.SetClip(new RectangleF(location, maxSize));
}
var container = new HtmlContainer(html, bridge, cssData);
container.Location = location;
container.MaxSize = maxSize;
container.PerformLayout(g);
container.PerformPaint(g);
if (prevClip != null)
{
g.SetClip(prevClip, CombineMode.Replace);
}
actualSize = container.ActualSize;
}
return actualSize;
}
