608 lines
23 KiB
C#
608 lines
23 KiB
C#
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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 System.Net;
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using System.Text;
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using System.Threading;
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using TheArtOfDev.HtmlRenderer.Adapters;
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using TheArtOfDev.HtmlRenderer.Adapters.Entities;
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using TheArtOfDev.HtmlRenderer.Core.Entities;
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using TheArtOfDev.HtmlRenderer.Core.Handlers;
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using TheArtOfDev.HtmlRenderer.Core.Utils;
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namespace TheArtOfDev.HtmlRenderer.Core.Dom
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{
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/// <summary>
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/// CSS box for iframe element.<br/>
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/// If the iframe is of embedded YouTube or Vimeo video it will show image with play.
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/// </summary>
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internal sealed class CssBoxFrame : CssBox
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{
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#region Fields and Consts
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/// <summary>
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/// the image word of this image box
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/// </summary>
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private readonly CssRectImage _imageWord;
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/// <summary>
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/// is the iframe is of embeded video
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/// </summary>
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private readonly bool _isVideo;
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/// <summary>
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/// the title of the video
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/// </summary>
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private string _videoTitle;
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/// <summary>
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/// the url of the video thumbnail image
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/// </summary>
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private string _videoImageUrl;
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/// <summary>
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/// link to the video on the site
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/// </summary>
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private string _videoLinkUrl;
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/// <summary>
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/// handler used for image loading by source
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/// </summary>
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private ImageLoadHandler _imageLoadHandler;
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/// <summary>
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/// is image load is finished, used to know if no image is found
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/// </summary>
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private bool _imageLoadingComplete;
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#endregion
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/// <summary>
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/// Init.
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/// </summary>
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/// <param name="parent">the parent box of this box</param>
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/// <param name="tag">the html tag data of this box</param>
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public CssBoxFrame(CssBox parent, HtmlTag tag)
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: base(parent, tag)
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{
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_imageWord = new CssRectImage(this);
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Words.Add(_imageWord);
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Uri uri;
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if (Uri.TryCreate(GetAttribute("src"), UriKind.Absolute, out uri))
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{
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if (uri.Host.IndexOf("youtube.com", StringComparison.InvariantCultureIgnoreCase) > -1)
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{
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_isVideo = true;
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LoadYoutubeDataAsync(uri);
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}
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else if (uri.Host.IndexOf("vimeo.com", StringComparison.InvariantCultureIgnoreCase) > -1)
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{
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_isVideo = true;
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LoadVimeoDataAsync(uri);
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}
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}
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if (!_isVideo)
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{
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SetErrorBorder();
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}
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}
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/// <summary>
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/// Is the css box clickable ("a" element is clickable)
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/// </summary>
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public override bool IsClickable
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{
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get { return true; }
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}
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/// <summary>
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/// Get the href link of the box (by default get "href" attribute)
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/// </summary>
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public override string HrefLink
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{
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get { return _videoLinkUrl ?? GetAttribute("src"); }
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}
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/// <summary>
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/// is the iframe is of embeded video
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/// </summary>
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public bool IsVideo
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{
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get { return _isVideo; }
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}
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/// <summary>
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/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
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/// </summary>
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public override void Dispose()
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{
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if (_imageLoadHandler != null)
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_imageLoadHandler.Dispose();
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base.Dispose();
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}
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#region Private methods
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/// <summary>
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/// Load YouTube video data (title, image, link) by calling YouTube API.
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/// </summary>
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private void LoadYoutubeDataAsync(Uri uri)
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{
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ThreadPool.QueueUserWorkItem(state =>
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{
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try
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{
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var apiUri = new Uri(string.Format("http://gdata.youtube.com/feeds/api/videos/{0}?v=2&alt=json", uri.Segments[2]));
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var client = new WebClient();
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client.Encoding = Encoding.UTF8;
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client.DownloadStringCompleted += OnDownloadYoutubeApiCompleted;
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client.DownloadStringAsync(apiUri);
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}
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catch (Exception ex)
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{
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HtmlContainer.ReportError(HtmlRenderErrorType.Iframe, "Failed to get youtube video data: " + uri, ex);
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HtmlContainer.RequestRefresh(false);
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}
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});
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}
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/// <summary>
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/// Parse YouTube API response to get video data (title, image, link).
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/// </summary>
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private void OnDownloadYoutubeApiCompleted(object sender, DownloadStringCompletedEventArgs e)
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{
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try
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{
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if (!e.Cancelled)
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{
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if (e.Error == null)
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{
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var idx = e.Result.IndexOf("\"media$title\"", StringComparison.Ordinal);
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if (idx > -1)
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{
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idx = e.Result.IndexOf("\"$t\"", idx);
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if (idx > -1)
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{
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idx = e.Result.IndexOf('"', idx + 4);
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if (idx > -1)
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{
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var endIdx = e.Result.IndexOf('"', idx + 1);
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while (e.Result[endIdx - 1] == '\\')
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endIdx = e.Result.IndexOf('"', endIdx + 1);
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if (endIdx > -1)
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{
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_videoTitle = e.Result.Substring(idx + 1, endIdx - idx - 1).Replace("\\\"", "\"");
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}
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}
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}
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}
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idx = e.Result.IndexOf("\"media$thumbnail\"", StringComparison.Ordinal);
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if (idx > -1)
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{
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var iidx = e.Result.IndexOf("sddefault", idx);
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if (iidx > -1)
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{
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if (string.IsNullOrEmpty(Width))
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Width = "640px";
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if (string.IsNullOrEmpty(Height))
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Height = "480px";
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}
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else
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{
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iidx = e.Result.IndexOf("hqdefault", idx);
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if (iidx > -1)
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{
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if (string.IsNullOrEmpty(Width))
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Width = "480px";
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if (string.IsNullOrEmpty(Height))
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Height = "360px";
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}
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else
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{
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iidx = e.Result.IndexOf("mqdefault", idx);
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if (iidx > -1)
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{
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if (string.IsNullOrEmpty(Width))
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Width = "320px";
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if (string.IsNullOrEmpty(Height))
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Height = "180px";
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}
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else
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{
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iidx = e.Result.IndexOf("default", idx);
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if (string.IsNullOrEmpty(Width))
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Width = "120px";
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if (string.IsNullOrEmpty(Height))
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Height = "90px";
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}
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}
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}
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iidx = e.Result.LastIndexOf("http:", iidx, StringComparison.Ordinal);
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if (iidx > -1)
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{
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var endIdx = e.Result.IndexOf('"', iidx);
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if (endIdx > -1)
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{
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_videoImageUrl = e.Result.Substring(iidx, endIdx - iidx).Replace("\\\"", "\"").Replace("\\", "");
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}
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}
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}
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idx = e.Result.IndexOf("\"link\"", StringComparison.Ordinal);
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if (idx > -1)
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{
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idx = e.Result.IndexOf("http:", idx);
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if (idx > -1)
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{
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var endIdx = e.Result.IndexOf('"', idx);
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if (endIdx > -1)
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{
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_videoLinkUrl = e.Result.Substring(idx, endIdx - idx).Replace("\\\"", "\"").Replace("\\", "");
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}
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}
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}
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}
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else
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{
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HandleDataLoadFailure(e.Error, "YouTube");
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}
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}
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}
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catch (Exception ex)
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{
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HtmlContainer.ReportError(HtmlRenderErrorType.Iframe, "Failed to parse YouTube video response", ex);
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}
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HandlePostApiCall(sender);
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}
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/// <summary>
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/// Load Vimeo video data (title, image, link) by calling Vimeo API.
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/// </summary>
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private void LoadVimeoDataAsync(Uri uri)
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{
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ThreadPool.QueueUserWorkItem(state =>
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{
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try
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{
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var apiUri = new Uri(string.Format("http://vimeo.com/api/v2/video/{0}.json", uri.Segments[2]));
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var client = new WebClient();
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client.Encoding = Encoding.UTF8;
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client.DownloadStringCompleted += OnDownloadVimeoApiCompleted;
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client.DownloadStringAsync(apiUri);
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}
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catch (Exception ex)
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{
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_imageLoadingComplete = true;
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SetErrorBorder();
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HtmlContainer.ReportError(HtmlRenderErrorType.Iframe, "Failed to get vimeo video data: " + uri, ex);
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HtmlContainer.RequestRefresh(false);
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}
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});
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}
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/// <summary>
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/// Parse Vimeo API response to get video data (title, image, link).
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/// </summary>
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private void OnDownloadVimeoApiCompleted(object sender, DownloadStringCompletedEventArgs e)
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{
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try
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{
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if (!e.Cancelled)
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{
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if (e.Error == null)
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{
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var idx = e.Result.IndexOf("\"title\"", StringComparison.Ordinal);
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if (idx > -1)
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{
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idx = e.Result.IndexOf('"', idx + 7);
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if (idx > -1)
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{
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var endIdx = e.Result.IndexOf('"', idx + 1);
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while (e.Result[endIdx - 1] == '\\')
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endIdx = e.Result.IndexOf('"', endIdx + 1);
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if (endIdx > -1)
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{
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_videoTitle = e.Result.Substring(idx + 1, endIdx - idx - 1).Replace("\\\"", "\"");
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}
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}
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}
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idx = e.Result.IndexOf("\"thumbnail_large\"", StringComparison.Ordinal);
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if (idx > -1)
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{
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if (string.IsNullOrEmpty(Width))
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Width = "640";
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if (string.IsNullOrEmpty(Height))
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Height = "360";
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}
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else
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{
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idx = e.Result.IndexOf("thumbnail_medium", idx);
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if (idx > -1)
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{
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if (string.IsNullOrEmpty(Width))
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Width = "200";
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if (string.IsNullOrEmpty(Height))
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Height = "150";
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}
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else
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{
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idx = e.Result.IndexOf("thumbnail_small", idx);
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if (string.IsNullOrEmpty(Width))
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Width = "100";
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if (string.IsNullOrEmpty(Height))
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Height = "75";
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}
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}
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if (idx > -1)
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{
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idx = e.Result.IndexOf("http:", idx);
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if (idx > -1)
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{
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var endIdx = e.Result.IndexOf('"', idx);
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if (endIdx > -1)
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{
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_videoImageUrl = e.Result.Substring(idx, endIdx - idx).Replace("\\\"", "\"").Replace("\\", "");
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}
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}
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}
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idx = e.Result.IndexOf("\"url\"", StringComparison.Ordinal);
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if (idx > -1)
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{
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idx = e.Result.IndexOf("http:", idx);
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if (idx > -1)
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{
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var endIdx = e.Result.IndexOf('"', idx);
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if (endIdx > -1)
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{
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_videoLinkUrl = e.Result.Substring(idx, endIdx - idx).Replace("\\\"", "\"").Replace("\\", "");
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}
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}
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}
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|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
HandleDataLoadFailure(e.Error, "Vimeo");
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
catch (Exception ex)
|
|||
|
|
{
|
|||
|
|
HtmlContainer.ReportError(HtmlRenderErrorType.Iframe, "Failed to parse Vimeo video response", ex);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
HandlePostApiCall(sender);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Handle error occurred during video data load to handle if the video was not found.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="ex">the exception that occurred during data load web request</param>
|
|||
|
|
/// <param name="source">the name of the video source (YouTube/Vimeo/Etc.)</param>
|
|||
|
|
private void HandleDataLoadFailure(Exception ex, string source)
|
|||
|
|
{
|
|||
|
|
var webError = ex as WebException;
|
|||
|
|
var webResponse = webError != null ? webError.Response as HttpWebResponse : null;
|
|||
|
|
if (webResponse != null && webResponse.StatusCode == HttpStatusCode.NotFound)
|
|||
|
|
{
|
|||
|
|
_videoTitle = "The video is not found, possibly removed by the user.";
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
HtmlContainer.ReportError(HtmlRenderErrorType.Iframe, "Failed to load " + source + " video data", ex);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Create image handler for downloading video image if found and release the WebClient instance used for API call.
|
|||
|
|
/// </summary>
|
|||
|
|
private void HandlePostApiCall(object sender)
|
|||
|
|
{
|
|||
|
|
try
|
|||
|
|
{
|
|||
|
|
if (_videoImageUrl != null)
|
|||
|
|
{
|
|||
|
|
_imageLoadHandler = new ImageLoadHandler(HtmlContainer, OnLoadImageComplete);
|
|||
|
|
_imageLoadHandler.LoadImage(_videoImageUrl, HtmlTag != null ? HtmlTag.Attributes : null);
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
_imageLoadingComplete = true;
|
|||
|
|
SetErrorBorder();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
var webClient = (WebClient)sender;
|
|||
|
|
webClient.DownloadStringCompleted -= OnDownloadYoutubeApiCompleted;
|
|||
|
|
webClient.DownloadStringCompleted -= OnDownloadVimeoApiCompleted;
|
|||
|
|
webClient.Dispose();
|
|||
|
|
|
|||
|
|
HtmlContainer.RequestRefresh(IsLayoutRequired());
|
|||
|
|
}
|
|||
|
|
catch
|
|||
|
|
{ }
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Paints the fragment
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="g">the device to draw to</param>
|
|||
|
|
protected override void PaintImp(RGraphics g)
|
|||
|
|
{
|
|||
|
|
var rects = CommonUtils.GetFirstValueOrDefault(Rectangles);
|
|||
|
|
|
|||
|
|
RPoint offset = HtmlContainer != null ? HtmlContainer.ScrollOffset : RPoint.Empty;
|
|||
|
|
rects.Offset(offset);
|
|||
|
|
|
|||
|
|
var clipped = RenderUtils.ClipGraphicsByOverflow(g, this);
|
|||
|
|
|
|||
|
|
PaintBackground(g, rects, true, true);
|
|||
|
|
|
|||
|
|
BordersDrawHandler.DrawBoxBorders(g, this, rects, true, true);
|
|||
|
|
|
|||
|
|
var word = Words[0];
|
|||
|
|
var tmpRect = word.Rectangle;
|
|||
|
|
tmpRect.Offset(offset);
|
|||
|
|
tmpRect.Height -= ActualBorderTopWidth + ActualBorderBottomWidth + ActualPaddingTop + ActualPaddingBottom;
|
|||
|
|
tmpRect.Y += ActualBorderTopWidth + ActualPaddingTop;
|
|||
|
|
tmpRect.X = Math.Floor(tmpRect.X);
|
|||
|
|
tmpRect.Y = Math.Floor(tmpRect.Y);
|
|||
|
|
var rect = tmpRect;
|
|||
|
|
|
|||
|
|
DrawImage(g, offset, rect);
|
|||
|
|
|
|||
|
|
DrawTitle(g, rect);
|
|||
|
|
|
|||
|
|
DrawPlay(g, rect);
|
|||
|
|
|
|||
|
|
if (clipped)
|
|||
|
|
g.PopClip();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Draw video image over the iframe if found.
|
|||
|
|
/// </summary>
|
|||
|
|
private void DrawImage(RGraphics g, RPoint offset, RRect rect)
|
|||
|
|
{
|
|||
|
|
if (_imageWord.Image != null)
|
|||
|
|
{
|
|||
|
|
if (rect.Width > 0 && rect.Height > 0)
|
|||
|
|
{
|
|||
|
|
if (_imageWord.ImageRectangle == RRect.Empty)
|
|||
|
|
g.DrawImage(_imageWord.Image, rect);
|
|||
|
|
else
|
|||
|
|
g.DrawImage(_imageWord.Image, rect, _imageWord.ImageRectangle);
|
|||
|
|
|
|||
|
|
if (_imageWord.Selected)
|
|||
|
|
{
|
|||
|
|
g.DrawRectangle(GetSelectionBackBrush(g, true), _imageWord.Left + offset.X, _imageWord.Top + offset.Y, _imageWord.Width + 2, DomUtils.GetCssLineBoxByWord(_imageWord).LineHeight);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
else if (_isVideo && !_imageLoadingComplete)
|
|||
|
|
{
|
|||
|
|
RenderUtils.DrawImageLoadingIcon(g, HtmlContainer, rect);
|
|||
|
|
if (rect.Width > 19 && rect.Height > 19)
|
|||
|
|
{
|
|||
|
|
g.DrawRectangle(g.GetPen(RColor.LightGray), rect.X, rect.Y, rect.Width, rect.Height);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Draw video title on top of the iframe if found.
|
|||
|
|
/// </summary>
|
|||
|
|
private void DrawTitle(RGraphics g, RRect rect)
|
|||
|
|
{
|
|||
|
|
if (_videoTitle != null && _imageWord.Width > 40 && _imageWord.Height > 40)
|
|||
|
|
{
|
|||
|
|
var font = HtmlContainer.Adapter.GetFont("Arial", 9f, RFontStyle.Regular);
|
|||
|
|
g.DrawRectangle(g.GetSolidBrush(RColor.FromArgb(160, 0, 0, 0)), rect.Left, rect.Top, rect.Width, ActualFont.Height + 7);
|
|||
|
|
|
|||
|
|
var titleRect = new RRect(rect.Left + 3, rect.Top + 3, rect.Width - 6, rect.Height - 6);
|
|||
|
|
g.DrawString(_videoTitle, font, RColor.WhiteSmoke, titleRect.Location, RSize.Empty, false);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Draw play over the iframe if we found link url.
|
|||
|
|
/// </summary>
|
|||
|
|
private void DrawPlay(RGraphics g, RRect rect)
|
|||
|
|
{
|
|||
|
|
if (_isVideo && _imageWord.Width > 70 && _imageWord.Height > 50)
|
|||
|
|
{
|
|||
|
|
var prevMode = g.SetAntiAliasSmoothingMode();
|
|||
|
|
|
|||
|
|
var size = new RSize(60, 40);
|
|||
|
|
var left = rect.Left + (rect.Width - size.Width) / 2;
|
|||
|
|
var top = rect.Top + (rect.Height - size.Height) / 2;
|
|||
|
|
g.DrawRectangle(g.GetSolidBrush(RColor.FromArgb(160, 0, 0, 0)), left, top, size.Width, size.Height);
|
|||
|
|
|
|||
|
|
RPoint[] points =
|
|||
|
|
{
|
|||
|
|
new RPoint(left + size.Width / 3f + 1,top + 3 * size.Height / 4f),
|
|||
|
|
new RPoint(left + size.Width / 3f + 1, top + size.Height / 4f),
|
|||
|
|
new RPoint(left + 2 * size.Width / 3f + 1, top + size.Height / 2f)
|
|||
|
|
};
|
|||
|
|
g.DrawPolygon(g.GetSolidBrush(RColor.White), points);
|
|||
|
|
|
|||
|
|
g.ReturnPreviousSmoothingMode(prevMode);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Assigns words its width and height
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="g">the device to use</param>
|
|||
|
|
internal override void MeasureWordsSize(RGraphics g)
|
|||
|
|
{
|
|||
|
|
if (!_wordsSizeMeasured)
|
|||
|
|
{
|
|||
|
|
MeasureWordSpacing(g);
|
|||
|
|
_wordsSizeMeasured = true;
|
|||
|
|
}
|
|||
|
|
CssLayoutEngine.MeasureImageSize(_imageWord);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Set error image border on the image box.
|
|||
|
|
/// </summary>
|
|||
|
|
private void SetErrorBorder()
|
|||
|
|
{
|
|||
|
|
SetAllBorders(CssConstants.Solid, "2px", "#A0A0A0");
|
|||
|
|
BorderRightColor = BorderBottomColor = "#E3E3E3";
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// On image load process is complete with image or without update the image box.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="image">the image loaded or null if failed</param>
|
|||
|
|
/// <param name="rectangle">the source rectangle to draw in the image (empty - draw everything)</param>
|
|||
|
|
/// <param name="async">is the callback was called async to load image call</param>
|
|||
|
|
private void OnLoadImageComplete(RImage image, RRect rectangle, bool async)
|
|||
|
|
{
|
|||
|
|
_imageWord.Image = image;
|
|||
|
|
_imageWord.ImageRectangle = rectangle;
|
|||
|
|
_imageLoadingComplete = true;
|
|||
|
|
_wordsSizeMeasured = false;
|
|||
|
|
|
|||
|
|
if (_imageLoadingComplete && image == null)
|
|||
|
|
{
|
|||
|
|
SetErrorBorder();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (async)
|
|||
|
|
{
|
|||
|
|
HtmlContainer.RequestRefresh(IsLayoutRequired());
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
private bool IsLayoutRequired()
|
|||
|
|
{
|
|||
|
|
var width = new CssLength(Width);
|
|||
|
|
var height = new CssLength(Height);
|
|||
|
|
return (width.Number <= 0 || width.Unit != CssUnit.Pixels) || (height.Number <= 0 || height.Unit != CssUnit.Pixels);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#endregion
|
|||
|
|
}
|
|||
|
|
}
|