public SkiaTextLayout(
string value,
RectangleF rect,
ITextAttributes textAttributes,
LayoutLine callback,
TextFlow textFlow = TextFlow.ClipBounds,
SKPaint paint = null)
{
_value = value;
_textAttributes = textAttributes;
_rect = rect;
_callback = callback;
_textFlow = textFlow;
_paint = paint;
if (paint == null)
{
_paint = new SKPaint()
{
Typeface = SkiaDelegatingFontService.Instance.GetTypeface(_textAttributes.FontName),
TextSize = _textAttributes.FontSize
};
_disposePaint = true;
}
var metrics = _paint.FontMetrics;
_descent = metrics.Descent;
_lineHeight = _paint.FontSpacing;
}
public AttributedTextRun(
int start,
int length,
ITextAttributes attributes)
{
Start = start;
Length = length;
Attributes = attributes;
}
private void Write(
ITextAttributes currentAttributes,
TextAttribute key,
string defaultValue,
TextWriter writer)
{
currentAttributes.TryGetValue(key, out var value);
if (!string.Equals(value, defaultValue))
{
WriteAttribute(writer, key.ToString(), value);
}
}
public static string GetAttribute(
this ITextAttributes attributes,
TextAttribute type,
string defaultValue = null)
{
if (attributes != null)
{
if (attributes.TryGetValue(type, out var value))
{
return(value);
}
}
return(defaultValue);
}
public static float GetFloatAttribute(
this ITextAttributes attributes,
TextAttribute type,
float defaultValue)
{
var value = attributes.GetAttribute(type);
if (value != null)
{
if (float.TryParse(value, out var floatValue))
{
return(floatValue);
}
}
return(defaultValue);
}
public static int GetIntAttribute(
this ITextAttributes attributes,
TextAttribute type,
int defaultValue)
{
var value = attributes.GetAttribute(type);
if (value != null)
{
if (int.TryParse(value, out var intValue))
{
return(intValue);
}
}
return(defaultValue);
}
public static T GetEnumAttribute <T>(
this ITextAttributes attributes,
TextAttribute type,
T defaultValue) where T : struct
{
var value = attributes.GetAttribute(type);
if (value != null)
{
if (Enum.TryParse(value, out T enumValue))
{
return(enumValue);
}
}
return(defaultValue);
}
public static bool GetBoolAttribute(
this ITextAttributes attributes,
TextAttribute type,
bool defaultValue = false)
{
var value = attributes.GetAttribute(type);
if (value != null)
{
if (bool.TryParse(value, out var boolValue))
{
return(boolValue);
}
}
return(defaultValue);
}
public static bool GetItalic(this ITextAttributes attributes)
{
return(attributes.GetBoolAttribute(TextAttribute.Italic));
}
public static bool GetBold(this ITextAttributes attributes)
{
return(attributes.GetBoolAttribute(TextAttribute.Bold));
}
public Size MeasureString(string text, ITextAttributes textAttributes, int maxWidth);
public void LayoutText(PathF path, string text, ITextAttributes textAttributes, LayoutLine callback)
{
// Do nothing
}
public CTFont LoadFont(ITextAttributes aTextAttributes)
{
return(aTextAttributes.FontName == null
? NativeFontService.Instance.LoadFont(_systemFontName, (float)aTextAttributes.FontSize)
: NativeFontService.Instance.LoadFont(aTextAttributes.FontName, (float)aTextAttributes.FontSize));
}
public static string GetFontName(this ITextAttributes attributes)
{
return(attributes.GetAttribute(TextAttribute.FontName));
}
public static bool GetUnorderedList(this ITextAttributes attributes)
{
return(attributes.GetBoolAttribute(TextAttribute.UnorderedList));
}
public static MarkerType GetMarker(this ITextAttributes attributes)
{
return(attributes.GetEnumAttribute(TextAttribute.UnorderedList, MarkerType.ClosedCircle));
}
public static bool GetSubscript(this ITextAttributes attributes) => attributes.GetBoolAttribute(TextAttribute.Subscript);
public static bool GetStrikethrough(this ITextAttributes attributes)
{
return(attributes.GetBoolAttribute(TextAttribute.Strikethrough));
}
public static string GetForegroundColor(this ITextAttributes attributes) => attributes.GetAttribute(TextAttribute.Color);
public static string GetBackgroundColor(this ITextAttributes attributes) => attributes.GetAttribute(TextAttribute.Background);
public static float GetFontSize(
this ITextAttributes attributes,
float?fontSize = null)
{
return(attributes.GetFloatAttribute(TextAttribute.FontName, fontSize ?? DefaultFontSize));
}
public AttributedTextBlock(string text, ITextAttributes attributes)
{
Text = text;
Attributes = attributes;
}
public static bool GetUnderline(this ITextAttributes attributes)
{
return(attributes.GetBoolAttribute(TextAttribute.Underline));
}
public List <PathF> ConvertToPaths(PathF aPath, string text, ITextAttributes textual, float ppu, float zoom)
{
return(new List <PathF>());
}
public void DrawStyledText(DrawingContext graphics, string text, ITextAttributes textAttributes, Rect textBounds);
