Nikita Tsukanov
11 years ago
8 changed files with 33 additions and 461 deletions
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// "Therefore those skilled at the unorthodox
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// are infinite as heaven and earth,
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// inexhaustible as the great rivers.
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// When they come to an end,
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// they begin again,
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// like the days and months;
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// they die and are reborn,
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// like the four seasons."
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//
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// - Sun Tsu,
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// "The Art of War"
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using System; |
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using Perspex.Media; |
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using Perspex.Media.Imaging; |
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using TheArtOfDev.HtmlRenderer.Core; |
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using TheArtOfDev.HtmlRenderer.Core.Entities; |
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using TheArtOfDev.HtmlRenderer.Core.Utils; |
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using TheArtOfDev.HtmlRenderer.Perspex.Adapters; |
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namespace Perspex.Controls |
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{ |
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/// <summary>
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/// Standalone static class for simple and direct HTML rendering.<br/>
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/// For Perspex UI prefer using HTML controls: <see cref="HtmlPanel"/> or <see cref="HtmlLabel"/>.<br/>
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/// For low-level control and performance consider using <see cref="HtmlContainer"/>.<br/>
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/// </summary>
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/// <remarks>
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/// <para>
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/// <b>Rendering to image</b><br/>
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/// // TODO:a update!
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/// See https://htmlrenderer.codeplex.com/wikipage?title=Image%20generation <br/>
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/// Because of GDI text rendering issue with alpha channel clear type text rendering rendering to image requires special handling.<br/>
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/// <u>Solid color background -</u> generate an image where the background is filled with solid color and all the html is rendered on top
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/// of the background color, GDI text rendering will be used. (RenderToImage method where the first argument is html string)<br/>
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/// <u>Image background -</u> render html on top of existing image with whatever currently exist but it cannot have transparent pixels,
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/// GDI text rendering will be used. (RenderToImage method where the first argument is Image object)<br/>
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/// <u>Transparent background -</u> render html to empty image using GDI+ text rendering, the generated image can be transparent.
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/// </para>
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/// <para>
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/// <b>Overwrite stylesheet resolution</b><br/>
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/// Exposed by optional "stylesheetLoad" delegate argument.<br/>
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/// Invoked when a stylesheet is about to be loaded by file path or URL in 'link' element.<br/>
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/// Allows to overwrite the loaded stylesheet by providing the stylesheet data manually, or different source (file or URL) to load from.<br/>
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/// Example: The stylesheet 'href' can be non-valid URI string that is interpreted in the overwrite delegate by custom logic to pre-loaded stylesheet object<br/>
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/// If no alternative data is provided the original source will be used.<br/>
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/// </para>
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/// <para>
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/// <b>Overwrite image resolution</b><br/>
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/// Exposed by optional "imageLoad" delegate argument.<br/>
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/// Invoked when an image is about to be loaded by file path, URL or inline data in 'img' element or background-image CSS style.<br/>
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/// Allows to overwrite the loaded image by providing the image object manually, or different source (file or URL) to load from.<br/>
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/// Example: image 'src' can be non-valid string that is interpreted in the overwrite delegate by custom logic to resource image object<br/>
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/// Example: image 'src' in the html is relative - the overwrite intercepts the load and provide full source URL to load the image from<br/>
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/// Example: image download requires authentication - the overwrite intercepts the load, downloads the image to disk using custom code and provide
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/// file path to load the image from.<br/>
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/// If no alternative data is provided the original source will be used.<br/>
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/// Note: Cannot use asynchronous scheme overwrite scheme.<br/>
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/// </para>
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/// </remarks>
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/// <example>
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/// <para>
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/// <b>Simple rendering</b><br/>
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/// HtmlRender.Render(g, "<![CDATA[<div>Hello <b>World</b></div>]]>");<br/>
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/// HtmlRender.Render(g, "<![CDATA[<div>Hello <b>World</b></div>]]>", 10, 10, 500, CssData.Parse("body {font-size: 20px}")");<br/>
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/// </para>
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/// <para>
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/// <b>Image rendering</b><br/>
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/// HtmlRender.RenderToImage("<![CDATA[<div>Hello <b>World</b></div>]]>", new Size(600,400));<br/>
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/// HtmlRender.RenderToImage("<![CDATA[<div>Hello <b>World</b></div>]]>", 600);<br/>
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/// HtmlRender.RenderToImage(existingImage, "<![CDATA[<div>Hello <b>World</b></div>]]>");<br/>
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/// </para>
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/// </example>
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public static class HtmlRender |
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{ |
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/// <summary>
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/// Adds a font family to be used in html rendering.<br/>
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/// The added font will be used by all rendering function including <see cref="HtmlContainer"/> and all Perspex controls.
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/// </summary>
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/// <remarks>
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/// The given font family instance must be remain alive while the renderer is in use.<br/>
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/// If loaded from file then the file must not be deleted.
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/// </remarks>
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/// <param name="fontFamily">The font family to add.</param>
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public static void AddFontFamily(string fontFamily) |
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{ |
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ArgChecker.AssertArgNotNull(fontFamily, "fontFamily"); |
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PerspexAdapter.Instance.AddFontFamily(new FontFamilyAdapter(fontFamily)); |
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} |
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/// <summary>
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/// Adds a font mapping from <paramref name="fromFamily"/> to <paramref name="toFamily"/> iff the <paramref name="fromFamily"/> is not found.<br/>
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/// When the <paramref name="fromFamily"/> font is used in rendered html and is not found in existing
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/// fonts (installed or added) it will be replaced by <paramref name="toFamily"/>.<br/>
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/// </summary>
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/// <remarks>
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/// This fonts mapping can be used as a fallback in case the requested font is not installed in the client system.
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/// </remarks>
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/// <param name="fromFamily">the font family to replace</param>
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/// <param name="toFamily">the font family to replace with</param>
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public static void AddFontFamilyMapping(string fromFamily, string toFamily) |
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{ |
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ArgChecker.AssertArgNotNullOrEmpty(fromFamily, "fromFamily"); |
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ArgChecker.AssertArgNotNullOrEmpty(toFamily, "toFamily"); |
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PerspexAdapter.Instance.AddFontFamilyMapping(fromFamily, toFamily); |
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} |
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/// <summary>
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/// Parse the given stylesheet to <see cref="CssData"/> object.<br/>
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/// If <paramref name="combineWithDefault"/> is true the parsed css blocks are added to the
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/// default css data (as defined by W3), merged if class name already exists. If false only the data in the given stylesheet is returned.
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/// </summary>
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/// <seealso cref="http://www.w3.org/TR/CSS21/sample.html"/>
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/// <param name="stylesheet">the stylesheet source to parse</param>
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/// <param name="combineWithDefault">true - combine the parsed css data with default css data, false - return only the parsed css data</param>
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/// <returns>the parsed css data</returns>
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public static CssData ParseStyleSheet(string stylesheet, bool combineWithDefault = true) |
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{ |
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return CssData.Parse(PerspexAdapter.Instance, stylesheet, combineWithDefault); |
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} |
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/// <summary>
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/// Measure the size (width and height) required to draw the given html under given max width restriction.<br/>
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/// If no max width restriction is given the layout will use the maximum possible width required by the content,
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/// it can be the longest text line or full image width.<br/>
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/// </summary>
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/// <param name="html">HTML source to render</param>
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/// <param name="maxWidth">optional: bound the width of the html to render in (default - 0, unlimited)</param>
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/// <param name="cssData">optional: the style to use for html rendering (default - use W3 default style)</param>
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/// <param name="stylesheetLoad">optional: can be used to overwrite stylesheet resolution logic</param>
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/// <param name="imageLoad">optional: can be used to overwrite image resolution logic</param>
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/// <returns>the size required for the html</returns>
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public static Size Measure(string html, double maxWidth = 0, CssData cssData = null, |
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EventHandler<HtmlStylesheetLoadEventArgs> stylesheetLoad = null, EventHandler<HtmlImageLoadEventArgs> imageLoad = null) |
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{ |
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Size actualSize = Size.Empty; |
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if (!string.IsNullOrEmpty(html)) |
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{ |
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using (var container = new HtmlContainer()) |
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{ |
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container.MaxSize = new Size(maxWidth, 0); |
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container.AvoidAsyncImagesLoading = true; |
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container.AvoidImagesLateLoading = true; |
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if (stylesheetLoad != null) |
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container.StylesheetLoad += stylesheetLoad; |
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if (imageLoad != null) |
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container.ImageLoad += imageLoad; |
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container.SetHtml(html, cssData); |
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container.PerformLayout(); |
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actualSize = container.ActualSize; |
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} |
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} |
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return actualSize; |
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} |
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/* |
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/// <summary>
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/// Renders the specified HTML source on the specified location and max width restriction.<br/>
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/// If <paramref name="maxWidth"/> is zero the html will use all the required width, otherwise it will perform line
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/// wrap as specified in the html<br/>
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/// Returned is the actual width and height of the rendered html.<br/>
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/// </summary>
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/// <param name="g">Device to render with</param>
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/// <param name="html">HTML source to render</param>
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/// <param name="left">optional: the left most location to start render the html at (default - 0)</param>
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/// <param name="top">optional: the top most location to start render the html at (default - 0)</param>
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/// <param name="maxWidth">optional: bound the width of the html to render in (default - 0, unlimited)</param>
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/// <param name="cssData">optional: the style to use for html rendering (default - use W3 default style)</param>
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/// <param name="stylesheetLoad">optional: can be used to overwrite stylesheet resolution logic</param>
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/// <param name="imageLoad">optional: can be used to overwrite image resolution logic</param>
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/// <returns>the actual size of the rendered html</returns>
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public static Size Render(IDrawingContext g, string html, double left = 0, double top = 0, double maxWidth = 0, CssData cssData = null, |
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EventHandler<HtmlStylesheetLoadEventArgs> stylesheetLoad = null, EventHandler<HtmlImageLoadEventArgs> imageLoad = null) |
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{ |
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ArgChecker.AssertArgNotNull(g, "g"); |
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return RenderClip(g, html, new Point(left, top), new Size(maxWidth, 0), cssData, stylesheetLoad, imageLoad); |
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} |
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/// <summary>
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/// Renders the specified HTML source on the specified location and max size restriction.<br/>
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/// If <paramref name="maxSize"/>.Width is zero the html will use all the required width, otherwise it will perform line
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/// wrap as specified in the html<br/>
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/// If <paramref name="maxSize"/>.Height is zero the html will use all the required height, otherwise it will clip at the
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/// given max height not rendering the html below it.<br/>
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/// Returned is the actual width and height of the rendered html.<br/>
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/// </summary>
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/// <param name="g">Device to render with</param>
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/// <param name="html">HTML source to render</param>
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/// <param name="location">the top-left most location to start render the html at</param>
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/// <param name="maxSize">the max size of the rendered html (if height above zero it will be clipped)</param>
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/// <param name="cssData">optional: the style to use for html rendering (default - use W3 default style)</param>
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/// <param name="stylesheetLoad">optional: can be used to overwrite stylesheet resolution logic</param>
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/// <param name="imageLoad">optional: can be used to overwrite image resolution logic</param>
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/// <returns>the actual size of the rendered html</returns>
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public static Size Render(IDrawingContext g, string html, Point location, Size maxSize, CssData cssData = null, |
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EventHandler<HtmlStylesheetLoadEventArgs> stylesheetLoad = null, EventHandler<HtmlImageLoadEventArgs> imageLoad = null) |
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{ |
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ArgChecker.AssertArgNotNull(g, "g"); |
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return RenderClip(g, html, location, maxSize, cssData, stylesheetLoad, imageLoad); |
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} |
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/// <summary>
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/// Renders the specified HTML into a new image of the requested size.<br/>
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/// The HTML will be layout by the given size but will be clipped if cannot fit.<br/>
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/// </summary>
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/// <param name="html">HTML source to render</param>
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/// <param name="size">The size of the image to render into, layout html by width and clipped by height</param>
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/// <param name="cssData">optional: the style to use for html rendering (default - use W3 default style)</param>
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/// <param name="stylesheetLoad">optional: can be used to overwrite stylesheet resolution logic</param>
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/// <param name="imageLoad">optional: can be used to overwrite image resolution logic</param>
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/// <returns>the generated image of the html</returns>
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public static BitmapFrame RenderToImage(string html, Size size, CssData cssData = null, |
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EventHandler<HtmlStylesheetLoadEventArgs> stylesheetLoad = null, EventHandler<HtmlImageLoadEventArgs> imageLoad = null) |
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{ |
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var renderTarget = new RenderTargetBitmap((int)size.Width, (int)size.Height, 96, 96, PixelFormats.Pbgra32); |
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if (!string.IsNullOrEmpty(html)) |
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{ |
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// render HTML into the visual
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DrawingVisual drawingVisual = new DrawingVisual(); |
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using (IDrawingContext g = drawingVisual.RenderOpen()) |
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{ |
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RenderHtml(g, html, new Point(), size, cssData, stylesheetLoad, imageLoad); |
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} |
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// render visual into target bitmap
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renderTarget.Render(drawingVisual); |
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} |
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return BitmapFrame.Create(renderTarget); |
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} |
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/// <summary>
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/// Renders the specified HTML into a new image of unknown size that will be determined by max width/height and HTML layout.<br/>
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/// If <paramref name="maxWidth"/> is zero the html will use all the required width, otherwise it will perform line
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/// wrap as specified in the html<br/>
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/// If <paramref name="maxHeight"/> is zero the html will use all the required height, otherwise it will clip at the
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/// given max height not rendering the html below it.<br/>
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/// <p>
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/// Limitation: The image cannot have transparent background, by default it will be white.<br/>
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/// See "Rendering to image" remarks section on <see cref="HtmlRender"/>.<br/>
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/// </p>
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/// </summary>
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/// <param name="html">HTML source to render</param>
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/// <param name="maxWidth">optional: the max width of the rendered html, if not zero and html cannot be layout within the limit it will be clipped</param>
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/// <param name="maxHeight">optional: the max height of the rendered html, if not zero and html cannot be layout within the limit it will be clipped</param>
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/// <param name="backgroundColor">optional: the color to fill the image with (default - white)</param>
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/// <param name="cssData">optional: the style to use for html rendering (default - use W3 default style)</param>
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/// <param name="stylesheetLoad">optional: can be used to overwrite stylesheet resolution logic</param>
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/// <param name="imageLoad">optional: can be used to overwrite image resolution logic</param>
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/// <returns>the generated image of the html</returns>
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public static BitmapFrame RenderToImage(string html, int maxWidth = 0, int maxHeight = 0, Color backgroundColor = new Color(), CssData cssData = null, |
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EventHandler<HtmlStylesheetLoadEventArgs> stylesheetLoad = null, EventHandler<HtmlImageLoadEventArgs> imageLoad = null) |
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{ |
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return RenderToImage(html, Size.Empty, new Size(maxWidth, maxHeight), backgroundColor, cssData, stylesheetLoad, imageLoad); |
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} |
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/// <summary>
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/// Renders the specified HTML into a new image of unknown size that will be determined by min/max width/height and HTML layout.<br/>
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/// If <paramref name="maxSize.Width"/> is zero the html will use all the required width, otherwise it will perform line
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/// wrap as specified in the html<br/>
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/// If <paramref name="maxSize.Height"/> is zero the html will use all the required height, otherwise it will clip at the
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/// given max height not rendering the html below it.<br/>
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/// If <paramref name="minSize"/> (Width/Height) is above zero the rendered image will not be smaller than the given min size.<br/>
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/// <p>
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/// Limitation: The image cannot have transparent background, by default it will be white.<br/>
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/// See "Rendering to image" remarks section on <see cref="HtmlRender"/>.<br/>
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/// </p>
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/// </summary>
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/// <param name="html">HTML source to render</param>
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/// <param name="minSize">optional: the min size of the rendered html (zero - not limit the width/height)</param>
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/// <param name="maxSize">optional: the max size of the rendered html, if not zero and html cannot be layout within the limit it will be clipped (zero - not limit the width/height)</param>
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/// <param name="backgroundColor">optional: the color to fill the image with (default - white)</param>
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/// <param name="cssData">optional: the style to use for html rendering (default - use W3 default style)</param>
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/// <param name="stylesheetLoad">optional: can be used to overwrite stylesheet resolution logic</param>
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/// <param name="imageLoad">optional: can be used to overwrite image resolution logic</param>
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/// <returns>the generated image of the html</returns>
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public static BitmapFrame RenderToImage(string html, Size minSize, Size maxSize, Color backgroundColor = new Color(), CssData cssData = null, |
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EventHandler<HtmlStylesheetLoadEventArgs> stylesheetLoad = null, EventHandler<HtmlImageLoadEventArgs> imageLoad = null) |
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{ |
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RenderTargetBitmap renderTarget; |
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if (!string.IsNullOrEmpty(html)) |
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{ |
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using (var container = new HtmlContainer()) |
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{ |
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container.AvoidAsyncImagesLoading = true; |
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container.AvoidImagesLateLoading = true; |
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if (stylesheetLoad != null) |
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container.StylesheetLoad += stylesheetLoad; |
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if (imageLoad != null) |
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container.ImageLoad += imageLoad; |
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container.SetHtml(html, cssData); |
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var finalSize = MeasureHtmlByRestrictions(container, minSize, maxSize); |
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container.MaxSize = finalSize; |
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renderTarget = new RenderTargetBitmap((int)finalSize.Width, (int)finalSize.Height, 96, 96, PixelFormats.Pbgra32); |
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// render HTML into the visual
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DrawingVisual drawingVisual = new DrawingVisual(); |
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using (IDrawingContext g = drawingVisual.RenderOpen()) |
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{ |
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container.PerformPaint(g, new Rect(new Size(maxSize.Width > 0 ? maxSize.Width : double.MaxValue, maxSize.Height > 0 ? maxSize.Height : double.MaxValue))); |
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} |
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// render visual into target bitmap
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renderTarget.Render(drawingVisual); |
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} |
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} |
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else |
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{ |
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renderTarget = new RenderTargetBitmap(0, 0, 96, 96, PixelFormats.Pbgra32); |
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} |
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return BitmapFrame.Create(renderTarget); |
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} |
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#region Private methods
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/// <summary>
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/// Measure the size of the html by performing layout under the given restrictions.
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/// </summary>
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/// <param name="htmlContainer">the html to calculate the layout for</param>
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/// <param name="minSize">the minimal size of the rendered html (zero - not limit the width/height)</param>
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/// <param name="maxSize">the maximum size of the rendered html, if not zero and html cannot be layout within the limit it will be clipped (zero - not limit the width/height)</param>
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/// <returns>return: the size of the html to be rendered within the min/max limits</returns>
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private static Size MeasureHtmlByRestrictions(HtmlContainer htmlContainer, Size minSize, Size maxSize) |
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{ |
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// use desktop created graphics to measure the HTML
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using (var mg = new GraphicsAdapter()) |
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{ |
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var sizeInt = HtmlRendererUtil.MeasureHtmlByRestrictions(mg, htmlContainer.HtmlContainerInt, Util.Convert(minSize), Util.Convert(maxSize)); |
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if (maxSize.Width < 1 && sizeInt.Width > 4096) |
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sizeInt.Width = 4096; |
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return Util.ConvertRound(sizeInt); |
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} |
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} |
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/// <summary>
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/// Renders the specified HTML source on the specified location and max size restriction.<br/>
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/// If <paramref name="maxSize"/>.Width is zero the html will use all the required width, otherwise it will perform line
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/// wrap as specified in the html<br/>
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/// If <paramref name="maxSize"/>.Height is zero the html will use all the required height, otherwise it will clip at the
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/// given max height not rendering the html below it.<br/>
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/// Clip the graphics so the html will not be rendered outside the max height bound given.<br/>
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/// Returned is the actual width and height of the rendered html.<br/>
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/// </summary>
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/// <param name="g">Device to render with</param>
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/// <param name="html">HTML source to render</param>
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/// <param name="location">the top-left most location to start render the html at</param>
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/// <param name="maxSize">the max size of the rendered html (if height above zero it will be clipped)</param>
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/// <param name="cssData">optional: the style to use for html rendering (default - use W3 default style)</param>
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/// <param name="stylesheetLoad">optional: can be used to overwrite stylesheet resolution logic</param>
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/// <param name="imageLoad">optional: can be used to overwrite image resolution logic</param>
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/// <returns>the actual size of the rendered html</returns>
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private static Size RenderClip(IDrawingContext g, string html, Point location, Size maxSize, CssData cssData, EventHandler<HtmlStylesheetLoadEventArgs> stylesheetLoad, EventHandler<HtmlImageLoadEventArgs> imageLoad) |
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{ |
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if (maxSize.Height > 0) |
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g.PushClip(new RectangleGeometry(new Rect(location, maxSize))); |
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var actualSize = RenderHtml(g, html, location, maxSize, cssData, stylesheetLoad, imageLoad); |
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if (maxSize.Height > 0) |
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g.Pop(); |
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return actualSize; |
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} |
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/// <summary>
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/// Renders the specified HTML source on the specified location and max size restriction.<br/>
|
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/// 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 width 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">optional: 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>
|
|||
private static Size RenderHtml(IDrawingContext g, string html, Point location, Size maxSize, CssData cssData, EventHandler<HtmlStylesheetLoadEventArgs> stylesheetLoad, EventHandler<HtmlImageLoadEventArgs> imageLoad) |
|||
{ |
|||
Size actualSize = Size.Empty; |
|||
|
|||
if (!string.IsNullOrEmpty(html)) |
|||
{ |
|||
using (var container = new HtmlContainer()) |
|||
{ |
|||
container.Location = location; |
|||
container.MaxSize = maxSize; |
|||
container.AvoidAsyncImagesLoading = true; |
|||
container.AvoidImagesLateLoading = true; |
|||
|
|||
if (stylesheetLoad != null) |
|||
container.StylesheetLoad += stylesheetLoad; |
|||
if (imageLoad != null) |
|||
container.ImageLoad += imageLoad; |
|||
|
|||
container.SetHtml(html, cssData); |
|||
container.PerformLayout(); |
|||
container.PerformPaint(g, new Rect(0, 0, double.MaxValue, double.MaxValue)); |
|||
|
|||
actualSize = container.ActualSize; |
|||
} |
|||
} |
|||
|
|||
return actualSize; |
|||
} |
|||
|
|||
#endregion
|
|||
*/ |
|||
} |
|||
} |
|||
Loading…
Reference in new issue