private InlineUIContainer RenderImage(HTML.Element e, ParagraphSizeTracker pst)
{
Uri ImageURI;
if (e.Attributes.ContainsKey("src") &&
Uri.TryCreate(e.Attributes["src"], UriKind.RelativeOrAbsolute, out ImageURI))
{
Image image = new Image()
{
Stretch = Stretch.Fill
};
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.BeginInit();
bitmapImage.UriSource = ImageURI;
bitmapImage.EndInit();
image.Source = bitmapImage;
if (ImageSizeCache.ContainsKey(ImageURI))
{
Tuple <int, int> size = ImageSizeCache[ImageURI];
image.Width = size.Item1;
image.Height = size.Item2;
}
// This hack forces image size to match pixel size,
// which undermines WPF's preference for honoring the
// embedded DPI value which leads to upscaled and
// mildly blurry images where that doesn't match
// the local display. Very high resolution displays
// might need another approach.
bitmapImage.DownloadCompleted += (s, ee) =>
{
ImageSizeCache[ImageURI] = new Tuple <int, int>(bitmapImage.PixelWidth, bitmapImage.PixelHeight);
image.Width = bitmapImage.PixelWidth;
image.Height = bitmapImage.PixelHeight;
};
// Communicate image size info back up to the container
if (pst != null)
{
pst.Add(image);
}
if (e.Attributes.ContainsKey("title"))
{
image.ToolTip = e.Attributes["title"];
}
else if (e.Attributes.ContainsKey("alt"))
{
image.ToolTip = e.Attributes["alt"];
}
// TODO arrange to display alt value if image can't be loaded
// (or before it has loaded)
return(new InlineUIContainer()
{
Child = image
});
}
else
{
return(null);
}
}
private Inline ConvertInline(HTML.Node n, Context ctx, bool collapseSpace, ParagraphSizeTracker pst)
{
if (n is HTML.Element)
{
return(ConvertInlineElement((HTML.Element)n, ctx, collapseSpace, pst));
}
else
{
Inline i = collapseSpace ? ConvertText(((HTML.Cdata)n).Content)
: ConvertFixedText(((HTML.Cdata)n).Content);
if (i != null)
{
i.FontSize = ctx.fontSize;
i.FontFamily = ctx.fontFamily;
i.FontWeight = ctx.fontWeight;
i.FontStyle = ctx.fontStyle;
}
return(i);
}
}
private Inline ConvertInlineElement(HTML.Element e, Context ctx, bool collapseSpace, ParagraphSizeTracker pst)
{
Span s;
switch (e.Name)
{
case "b":
case "strong":
s = new Span();
ctx = new Context(ctx)
{
fontWeight = FontWeights.Bold
};
break;
case "i":
case "em":
s = new Span();
ctx = new Context(ctx)
{
fontStyle = FontStyles.Italic
};
break;
case "u":
s = new Underline();
break;
case "big": {
s = new Span();
double newSize = ctx.fontSize * 1.25;
ctx = new Context(ctx)
{
fontSize = newSize
};
break;
}
case "small": {
s = new Span();
double newSize = ctx.fontSize / 1.25;
ctx = new Context(ctx)
{
fontSize = newSize
};
break;
}
case "code":
case "tt":
s = new Span();
ctx = new Context(ctx)
{
fontFamily = MonospaceFont
};
break;
case "sub":
s = new Span();
s.Typography.Variants = FontVariants.Subscript;
break;
case "sup":
s = new Span();
s.Typography.Variants = FontVariants.Superscript;
break;
case "a":
s = RenderHyperlink(e);
break;
case "img":
return(RenderImage(e, pst));
case "br":
return(new LineBreak());
// TODO map, anything else?
default: s = new Span(); break;
}
s.Inlines.AddRange(ConvertInlines(e, ctx, collapseSpace, pst));
return(s);
}
private IEnumerable <Inline> ConvertInlines(HTML.Element e, Context ctx, bool collapseSpace, ParagraphSizeTracker pst)
{
return(from i in
(from n in e.Contents select ConvertInline(n, ctx, collapseSpace, pst))
where i != null
select i);
}
