static int _suffixesUsed = 0; //this counts the amount of fonts we added (the name comes from the fact that this is what we use as a suffix for the names to use for the fonts).
/// <summary>
/// Creates a css style with @font-face for the given font, then returns the name to use as the font-family. This name is actually the relative path to the file containing the font.
/// </summary>
/// <param name="fontPath">The path to the font.</param>
/// <param name="elementThatARelativeUriIsRelativeTo">This is an optional parameter that is helpful
/// in case of relative URI's. In fact, when an URI is relative, we need to transform it into an
/// absolute URI in order to locate the resources. A relative URI is usually relative to the place
/// where the .XAML file is located. For example, when using an Image control, relative image paths
/// are relative to the location of the .XAML file that contains the Image control.</param>
/// <returns>The name to use to set the font-family property, a.k.a: the relative path to the font.</returns>
internal static string LoadFont(string fontPath, UIElement elementThatARelativeUriIsRelativeTo = null)
{
if (!fontPath.Contains('.')) //Note: if the path does not contain the character '.', then it means that there is no specified file. It is therefore a default font or thet path to a folder containing fonts, which we cannot handle so we simply return the font as is.
{
return(fontPath);
}
string fontPathWithoutCustomName = fontPath;
int indexOfHashTag = fontPath.IndexOf('#');
if (indexOfHashTag != -1)
{
fontPathWithoutCustomName = fontPath.Substring(0, indexOfHashTag);
}
string lowerCasePathWithoutCustomName = fontPathWithoutCustomName.ToLower();
//we try to make the path fit by considering that it is the startup assembly if not specifically defined otherwise: (basically add a prefix ms-appx if there is none)
//Note: we should not enter the "if" below if the path was defined in xaml. This cas is already handled during compilation.
if (!(lowerCasePathWithoutCustomName.StartsWith(@"ms-appx:/") ||
lowerCasePathWithoutCustomName.StartsWith(@"http://") ||
lowerCasePathWithoutCustomName.StartsWith(@"https://") ||
fontPathWithoutCustomName.Contains(@";component/")))
{
fontPathWithoutCustomName = "ms-appx:/" + fontPathWithoutCustomName;
}
//Get a path that will lead to the position of the file:
string relativeFontPath = INTERNAL_UriHelper.ConvertToHtml5Path(fontPathWithoutCustomName, elementThatARelativeUriIsRelativeTo);
if (_loadedFonts.ContainsKey(relativeFontPath))
{
return(_loadedFonts[relativeFontPath]);
}
return(CreateFontInJS(relativeFontPath)); //note: this adds the relativeFontPath to _loadedFonts.
}
/// <summary>
/// Creates a css style with @font-face for the given font, then returns the name to use as the font-family. This name is actually the relative path to the file containing the font.
/// </summary>
/// <param name="fontPath">The path to the font.</param>
/// <param name="elementThatARelativeUriIsRelativeTo">This is an optional parameter that is helpful
/// in case of relative URI's. In fact, when an URI is relative, we need to transform it into an
/// absolute URI in order to locate the resources. A relative URI is usually relative to the place
/// where the .XAML file is located. For example, when using an Image control, relative image paths
/// are relative to the location of the .XAML file that contains the Image control.</param>
/// <returns>The name to use to set the font-family property, a.k.a: the relative path to the font.</returns>
internal static string LoadFont(string fontPath, UIElement elementThatARelativeUriIsRelativeTo = null)
{
fontPath = fontPath.Trim(); //Todo-perf: this is probably negligible in most cases but ensuring that the _source of the FontFamily the fontPath comes from is trimmed will allow us to only call Trim() once per FontFamily instead of every time we add a Control to the Visual tree.
if (!fontPath.Contains('.')) //Note: if the path does not contain the character '.', then it means that there is no specified file. It is therefore a default font or thet path to a folder containing fonts, which we cannot handle so we simply return the font as is.
{
if (fontPath == "Portable User Interface")
{
return(INTERNAL_FontsHelper.DefaultCssFontFamily);
}
return(fontPath);
}
string fontPathWithoutCustomName = fontPath;
int indexOfHashTag = fontPath.IndexOf('#');
if (indexOfHashTag != -1)
{
fontPathWithoutCustomName = fontPath.Substring(0, indexOfHashTag);
}
string lowerCasePathWithoutCustomName = fontPathWithoutCustomName.ToLower();
//we try to make the path fit by considering that it is the startup assembly if not specifically defined otherwise: (basically add a prefix ms-appx if there is none)
//Note: we should not enter the "if" below if the path was defined in xaml. This cas is already handled during compilation.
if (!(lowerCasePathWithoutCustomName.StartsWith(@"ms-appx:/") ||
lowerCasePathWithoutCustomName.StartsWith(@"http://") ||
lowerCasePathWithoutCustomName.StartsWith(@"https://") ||
fontPathWithoutCustomName.Contains(@";component/")))
{
fontPathWithoutCustomName = "ms-appx:/" + fontPathWithoutCustomName;
}
//Get a path that will lead to the position of the file:
string relativeFontPath = INTERNAL_UriHelper.ConvertToHtml5Path(fontPathWithoutCustomName, elementThatARelativeUriIsRelativeTo);
if (_loadedFonts.ContainsKey(relativeFontPath))
{
return(_loadedFonts[relativeFontPath]);
}
return(CreateFontInJS(relativeFontPath)); //note: this adds the relativeFontPath to _loadedFonts.
}
