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using System;
using System.ComponentModel;
using System.Runtime.CompilerServices;
namespace Xamarin.Forms
{
[ContentProperty("Text")]
public sealed class Span : INotifyPropertyChanged, IFontElement
{
Color _backgroundColor;
Font _font;
FontAttributes _fontAttributes;
string _fontFamily;
double _fontSize;
Color _foregroundColor;
bool _inUpdate; // if we ever make this thread safe we need to move to a mutex
string _text;
public Span()
{
_fontFamily = null;
_fontAttributes = FontAttributes.None;
_fontSize = Device.GetNamedSize(NamedSize.Default, typeof(Label), true);
_font = Font.SystemFontOfSize(_fontSize);
}
public Color BackgroundColor
{
get { return _backgroundColor; }
set
{
if (_backgroundColor == value)
return;
_backgroundColor = value;
OnPropertyChanged();
}
}
[Obsolete("Please use the Font properties directly. Obsolete in 1.3.0")]
public Font Font
{
get { return _font; }
set
{
if (_font == value)
return;
_font = value;
OnPropertyChanged();
UpdateFontPropertiesFromStruct();
}
}
public Color ForegroundColor
{
get { return _foregroundColor; }
set
{
if (_foregroundColor == value)
return;
_foregroundColor = value;
OnPropertyChanged();
}
}
public string Text
{
get { return _text; }
set
{
if (_text == value)
return;
_text = value;
OnPropertyChanged();
}
}
public FontAttributes FontAttributes
{
get { return _fontAttributes; }
set
{
if (_fontAttributes == value)
return;
_fontAttributes = value;
OnPropertyChanged();
UpdateStructFromFontProperties();
}
}
public string FontFamily
{
get { return _fontFamily; }
set
{
if (_fontFamily == value)
return;
_fontFamily = value;
OnPropertyChanged();
UpdateStructFromFontProperties();
}
}
[TypeConverter(typeof(FontSizeConverter))]
public double FontSize
{
get { return _fontSize; }
set
{
if (_fontSize == value)
return;
_fontSize = value;
OnPropertyChanged();
UpdateStructFromFontProperties();
}
}
public event PropertyChangedEventHandler PropertyChanged;
void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
handler(this, new PropertyChangedEventArgs(propertyName));
}
#pragma warning disable 0618 // retain until Span.Font removed
void UpdateFontPropertiesFromStruct()
{
if (_inUpdate)
return;
_inUpdate = true;
if (Font == Font.Default)
{
FontSize = Device.GetNamedSize(NamedSize.Default, typeof(Label), true);
FontFamily = null;
FontAttributes = FontAttributes.None;
}
else
{
FontSize = Font.UseNamedSize ? Device.GetNamedSize(Font.NamedSize, typeof(Label), true) : Font.FontSize;
FontFamily = Font.FontFamily;
FontAttributes = Font.FontAttributes;
}
_inUpdate = false;
}
void UpdateStructFromFontProperties()
{
if (_inUpdate)
return;
_inUpdate = true;
if (FontFamily != null)
{
Font = Font.OfSize(FontFamily, FontSize).WithAttributes(FontAttributes);
}
else
{
Font = Font.SystemFontOfSize(FontSize).WithAttributes(FontAttributes);
}
_inUpdate = false;
}
}
#pragma warning restore
}
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