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using Xamarin.Forms.Internals;
namespace Xamarin.Forms
{
static class FontElement
{
public static readonly BindableProperty FontProperty =
BindableProperty.Create("Font", typeof(Font), typeof(IFontElement), default(Font),
propertyChanged: OnFontPropertyChanged);
public static readonly BindableProperty FontFamilyProperty =
BindableProperty.Create("FontFamily", typeof(string), typeof(IFontElement), default(string),
propertyChanged: OnFontFamilyChanged);
public static readonly BindableProperty FontSizeProperty =
BindableProperty.Create("FontSize", typeof(double), typeof(IFontElement), -1.0,
propertyChanged: OnFontSizeChanged,
defaultValueCreator: FontSizeDefaultValueCreator);
public static readonly BindableProperty FontAttributesProperty =
BindableProperty.Create("FontAttributes", typeof(FontAttributes), typeof(IFontElement), FontAttributes.None,
propertyChanged: OnFontAttributesChanged);
static readonly BindableProperty CancelEventsProperty =
BindableProperty.Create("CancelEvents", typeof(bool), typeof(FontElement), false);
static bool GetCancelEvents(BindableObject bindable) => (bool)bindable.GetValue(CancelEventsProperty);
static void SetCancelEvents(BindableObject bindable, bool value)
{
bindable.SetValue(CancelEventsProperty, value);
}
static void OnFontPropertyChanged(BindableObject bindable, object oldValue, object newValue)
{
if (GetCancelEvents(bindable))
return;
SetCancelEvents(bindable, true);
var font = (Font)newValue;
if (font == Font.Default) {
bindable.ClearValue(FontFamilyProperty);
bindable.ClearValue(FontSizeProperty);
bindable.ClearValue(FontAttributesProperty);
} else {
bindable.SetValue(FontFamilyProperty, font.FontFamily);
if (font.UseNamedSize)
bindable.SetValue(FontSizeProperty, Device.GetNamedSize(font.NamedSize, bindable.GetType(), true));
else
bindable.SetValue(FontSizeProperty, font.FontSize);
bindable.SetValue(FontAttributesProperty, font.FontAttributes);
}
SetCancelEvents(bindable, false);
}
static void OnFontFamilyChanged(BindableObject bindable, object oldValue, object newValue)
{
if (GetCancelEvents(bindable))
return;
SetCancelEvents(bindable, true);
var values = bindable.GetValues(FontSizeProperty, FontAttributesProperty);
var fontSize = (double)values[0];
var fontAttributes = (FontAttributes)values[1];
var fontFamily = (string)newValue;
if (fontFamily != null)
bindable.SetValue(FontProperty, Font.OfSize(fontFamily, fontSize).WithAttributes(fontAttributes));
else
bindable.SetValue(FontProperty, Font.SystemFontOfSize(fontSize, fontAttributes));
SetCancelEvents(bindable, false);
((IFontElement)bindable).OnFontFamilyChanged((string)oldValue, (string)newValue);
}
static void OnFontSizeChanged(BindableObject bindable, object oldValue, object newValue)
{
if (GetCancelEvents(bindable))
return;
SetCancelEvents(bindable, true);
var values = bindable.GetValues(FontFamilyProperty, FontAttributesProperty);
var fontSize = (double)newValue;
var fontAttributes = (FontAttributes)values[1];
var fontFamily = (string)values[0];
if (fontFamily != null)
bindable.SetValue(FontProperty, Font.OfSize(fontFamily, fontSize).WithAttributes(fontAttributes));
else
bindable.SetValue(FontProperty, Font.SystemFontOfSize(fontSize, fontAttributes));
SetCancelEvents(bindable, false);
((IFontElement)bindable).OnFontSizeChanged((double)oldValue, (double)newValue);
}
static object FontSizeDefaultValueCreator(BindableObject bindable)
{
return ((IFontElement)bindable).FontSizeDefaultValueCreator();
}
static void OnFontAttributesChanged(BindableObject bindable, object oldValue, object newValue)
{
if (GetCancelEvents(bindable))
return;
SetCancelEvents(bindable, true);
var values = bindable.GetValues(FontFamilyProperty, FontSizeProperty);
var fontSize = (double)values[1];
var fontAttributes = (FontAttributes)newValue;
var fontFamily = (string)values[0];
if (fontFamily != null)
bindable.SetValue(FontProperty, Font.OfSize(fontFamily, fontSize).WithAttributes(fontAttributes));
else
bindable.SetValue(FontProperty, Font.SystemFontOfSize(fontSize, fontAttributes));
SetCancelEvents(bindable, false);
((IFontElement)bindable).OnFontAttributesChanged((FontAttributes)oldValue, (FontAttributes)newValue);
}
}
}
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