/// <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>
/// 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>
/// <returns>the size required for the html</returns>
public static SizeF Measure(Graphics g, string html, float maxWidth = 0, CssData cssData = null)
{
ArgChecker.AssertArgNotNull(g, "g");
return Measure(g, html, maxWidth, cssData, null, null);
}
/// <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>
/// 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>
/// <returns>the actual size of the rendered html</returns>
public static SizeF Render(Graphics g, string html, PointF location, SizeF maxSize, CssData cssData = null)
{
ArgChecker.AssertArgNotNull(g, "g");
return Render(g, html, location, maxSize, cssData, null, null);
}
/// <summary>
/// Renders the specified HTML source on the specified location and max size restriction.<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/>
/// 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="left">optional: the left most location to start render the html at (default - 0)</param>
/// <param name="top">optional: the top most location to start render the html at (default - 0)</param>
/// <param name="maxWidth">optional: Width to fit HTML drawing (default - 0, unlimited)</param>
/// <param name="cssData">optiona: the style to use for html rendering (default - use W3 default style)</param>
/// <returns>the actual size of the rendered html</returns>
public static SizeF Render(Graphics g, string html, float left = 0, float top = 0, float maxWidth = 0, CssData cssData = null)
{
return Render(g, html, new PointF(left, top), new SizeF(maxWidth, 0), cssData, null, null);
}
/// <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;
}
/// <summary>
/// Create deep copy of the css data with cloned css blocks.
/// </summary>
/// <returns>cloned object</returns>
public CssData Clone()
{
var clone = new CssData();
foreach (var mid in _mediaBlocks)
{
var cloneMid = new Dictionary<string, List<CssBlock>>();
foreach (var blocks in mid.Value)
{
var cloneList = new List<CssBlock>();
foreach (var cssBlock in blocks.Value)
{
cloneList.Add(cssBlock.Clone());
}
cloneMid[blocks.Key] = cloneList;
}
clone._mediaBlocks[mid.Key] = cloneMid;
}
return clone;
}
/// <summary>
/// Init with optinals document and stylesheet.
/// </summary>
/// <param name="htmlSource">the html to init with, init empty if not given</param>
/// <param name="bridge">used to resolve external references in html code (property, method calls)</param>
/// <param name="baseCssData">optional: the stylesheet to init with, init default if not given</param>
public HtmlContainer(string htmlSource, object bridge, CssData baseCssData = null)
{
ArgChecker.AssertArgNotNullOrEmpty(htmlSource, "htmlSource");
_bridge = bridge;
_cssData = baseCssData ?? CssUtils.DefaultCssData;
if(htmlSource != null)
{
_root = DomParser.GenerateCssTree(htmlSource, ref _cssData, bridge);
if (_root != null)
{
_root.HtmlContainer = this;
_selectionHandler = new SelectionHandler(_root);
}
}
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
private void Dispose(bool all)
{
try
{
if (all)
{
LinkClicked = null;
Refresh = null;
RenderError = null;
StylesheetLoad = null;
ImageLoad = null;
}
_cssData = null;
if (_root != null)
_root.Dispose();
_root = null;
if (_selectionHandler != null)
_selectionHandler.Dispose();
_selectionHandler = null;
}
catch
{
}
}
/// <summary>
/// Init with optional document and stylesheet.
/// </summary>
/// <param name="htmlSource">the html to init with, init empty if not given</param>
/// <param name="baseCssData">optional: the stylesheet to init with, init default if not given</param>
public void SetHtml(string htmlSource, CssData baseCssData = null)
{
if(_root != null)
{
_root.Dispose();
_root = null;
if (_selectionHandler != null)
_selectionHandler.Dispose();
_selectionHandler = null;
}
if (!string.IsNullOrEmpty(htmlSource))
{
_cssData = baseCssData ?? CssUtils.DefaultCssData;
_root = DomParser.GenerateCssTree(htmlSource, this, ref _cssData);
if (_root != null)
{
_selectionHandler = new SelectionHandler(_root);
}
}
}
/// <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;
}
