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using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using UIKit;
namespace Xamarin.Forms.Platform.iOS
{
public static class FontExtensions
{
static readonly Dictionary<ToUIFontKey, UIFont> ToUiFont = new Dictionary<ToUIFontKey, UIFont>();
public static UIFont ToUIFont(this Font self)
{
var size = (float)self.FontSize;
if (self.UseNamedSize)
{
switch (self.NamedSize)
{
case NamedSize.Micro:
size = 12;
break;
case NamedSize.Small:
size = 14;
break;
case NamedSize.Medium:
size = 17; // as defined by iOS documentation
break;
case NamedSize.Large:
size = 22;
break;
default:
size = 17;
break;
}
}
var bold = self.FontAttributes.HasFlag(FontAttributes.Bold);
var italic = self.FontAttributes.HasFlag(FontAttributes.Italic);
if (self.FontFamily != null)
{
try
{
if (UIFont.FamilyNames.Contains(self.FontFamily))
{
var descriptor = new UIFontDescriptor().CreateWithFamily(self.FontFamily);
if (bold || italic)
{
var traits = (UIFontDescriptorSymbolicTraits)0;
if (bold)
traits = traits | UIFontDescriptorSymbolicTraits.Bold;
if (italic)
traits = traits | UIFontDescriptorSymbolicTraits.Italic;
descriptor = descriptor.CreateWithTraits(traits);
return UIFont.FromDescriptor(descriptor, size);
}
}
return UIFont.FromName(self.FontFamily, size);
}
catch
{
Debug.WriteLine("Could not load font named: {0}", self.FontFamily);
}
}
if (bold && italic)
{
var defaultFont = UIFont.SystemFontOfSize(size);
var descriptor = defaultFont.FontDescriptor.CreateWithTraits(UIFontDescriptorSymbolicTraits.Bold | UIFontDescriptorSymbolicTraits.Italic);
return UIFont.FromDescriptor(descriptor, 0);
}
if (bold)
return UIFont.BoldSystemFontOfSize(size);
if (italic)
return UIFont.ItalicSystemFontOfSize(size);
return UIFont.SystemFontOfSize(size);
}
internal static bool IsDefault(this Span self)
{
return self.FontFamily == null && self.FontSize == Device.GetNamedSize(NamedSize.Default, typeof(Label), true) && self.FontAttributes == FontAttributes.None;
}
internal static UIFont ToUIFont(this Label label)
{
var values = label.GetValues(Label.FontFamilyProperty, Label.FontSizeProperty, Label.FontAttributesProperty);
return ToUIFont((string)values[0], (float)(double)values[1], (FontAttributes)values[2]) ?? UIFont.SystemFontOfSize(UIFont.LabelFontSize);
}
internal static UIFont ToUIFont(this IFontElement element)
{
return ToUIFont(element.FontFamily, (float)element.FontSize, element.FontAttributes);
}
static UIFont _ToUIFont(string family, float size, FontAttributes attributes)
{
var bold = (attributes & FontAttributes.Bold) != 0;
var italic = (attributes & FontAttributes.Italic) != 0;
if (family != null)
{
try
{
UIFont result;
if (UIFont.FamilyNames.Contains(family))
{
var descriptor = new UIFontDescriptor().CreateWithFamily(family);
if (bold || italic)
{
var traits = (UIFontDescriptorSymbolicTraits)0;
if (bold)
traits = traits | UIFontDescriptorSymbolicTraits.Bold;
if (italic)
traits = traits | UIFontDescriptorSymbolicTraits.Italic;
descriptor = descriptor.CreateWithTraits(traits);
result = UIFont.FromDescriptor(descriptor, size);
if (result != null)
return result;
}
}
result = UIFont.FromName(family, size);
if (result != null)
return result;
}
catch
{
Debug.WriteLine("Could not load font named: {0}", family);
}
}
if (bold && italic)
{
var defaultFont = UIFont.SystemFontOfSize(size);
var descriptor = defaultFont.FontDescriptor.CreateWithTraits(UIFontDescriptorSymbolicTraits.Bold | UIFontDescriptorSymbolicTraits.Italic);
return UIFont.FromDescriptor(descriptor, 0);
}
if (bold)
return UIFont.BoldSystemFontOfSize(size);
if (italic)
return UIFont.ItalicSystemFontOfSize(size);
return UIFont.SystemFontOfSize(size);
}
static UIFont ToUIFont(string family, float size, FontAttributes attributes)
{
var key = new ToUIFontKey(family, size, attributes);
lock (ToUiFont)
{
UIFont value;
if (ToUiFont.TryGetValue(key, out value))
return value;
}
var generatedValue = _ToUIFont(family, size, attributes);
lock (ToUiFont)
{
UIFont value;
if (!ToUiFont.TryGetValue(key, out value))
ToUiFont.Add(key, value = generatedValue);
return value;
}
}
struct ToUIFontKey
{
internal ToUIFontKey(string family, float size, FontAttributes attributes)
{
_family = family;
_size = size;
_attributes = attributes;
}
#pragma warning disable 0414 // these are not called explicitly, but they are used to establish uniqueness. allow it!
string _family;
float _size;
FontAttributes _attributes;
#pragma warning restore 0414
}
}
}
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