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using System;
using System.ComponentModel;
using Xamarin.Forms.Internals;
using Xamarin.Forms.Platform;
namespace Xamarin.Forms
{
[ContentProperty("Text")]
[RenderWith(typeof(_LabelRenderer))]
public class Label : View, IFontElement, ITextElement, IElementConfiguration<Label>
{
public static readonly BindableProperty HorizontalTextAlignmentProperty = BindableProperty.Create("HorizontalTextAlignment", typeof(TextAlignment), typeof(Label), TextAlignment.Start,
propertyChanged: OnHorizontalTextAlignmentPropertyChanged);
[Obsolete("XAlignProperty is obsolete as of version 2.0.0. Please use HorizontalTextAlignmentProperty instead.")]
public static readonly BindableProperty XAlignProperty = HorizontalTextAlignmentProperty;
public static readonly BindableProperty VerticalTextAlignmentProperty = BindableProperty.Create("VerticalTextAlignment", typeof(TextAlignment), typeof(Label), TextAlignment.Start,
propertyChanged: OnVerticalTextAlignmentPropertyChanged);
[Obsolete("YAlignProperty is obsolete as of version 2.0.0. Please use VerticalTextAlignmentProperty instead.")]
public static readonly BindableProperty YAlignProperty = VerticalTextAlignmentProperty;
public static readonly BindableProperty TextColorProperty = TextElement.TextColorProperty;
public static readonly BindableProperty FontProperty = FontElement.FontProperty;
public static readonly BindableProperty TextProperty = BindableProperty.Create("Text", typeof(string), typeof(Label), default(string), propertyChanged: OnTextPropertyChanged);
public static readonly BindableProperty FontFamilyProperty = FontElement.FontFamilyProperty;
public static readonly BindableProperty FontSizeProperty = FontElement.FontSizeProperty;
public static readonly BindableProperty FontAttributesProperty = FontElement.FontAttributesProperty;
public static readonly BindableProperty FormattedTextProperty = BindableProperty.Create("FormattedText", typeof(FormattedString), typeof(Label), default(FormattedString),
propertyChanging: (bindable, oldvalue, newvalue) =>
{
if (oldvalue != null)
((FormattedString)oldvalue).PropertyChanged -= ((Label)bindable).OnFormattedTextChanged;
}, propertyChanged: (bindable, oldvalue, newvalue) =>
{
if (newvalue != null)
((FormattedString)newvalue).PropertyChanged += ((Label)bindable).OnFormattedTextChanged;
((Label)bindable).InvalidateMeasureInternal(InvalidationTrigger.MeasureChanged);
if (newvalue != null)
((Label)bindable).Text = null;
});
public static readonly BindableProperty LineBreakModeProperty = BindableProperty.Create("LineBreakMode", typeof(LineBreakMode), typeof(Label), LineBreakMode.WordWrap,
propertyChanged: (bindable, oldvalue, newvalue) => ((Label)bindable).InvalidateMeasureInternal(InvalidationTrigger.MeasureChanged));
readonly Lazy<PlatformConfigurationRegistry<Label>> _platformConfigurationRegistry;
public Label()
{
_platformConfigurationRegistry = new Lazy<PlatformConfigurationRegistry<Label>>(() => new PlatformConfigurationRegistry<Label>(this));
}
[Obsolete("Font is obsolete as of version 1.3.0. Please use the Font attributes which are on the class itself.")]
public Font Font
{
get { return (Font)GetValue(FontProperty); }
set { SetValue(FontProperty, value); }
}
public FormattedString FormattedText
{
get { return (FormattedString)GetValue(FormattedTextProperty); }
set { SetValue(FormattedTextProperty, value); }
}
public TextAlignment HorizontalTextAlignment
{
get { return (TextAlignment)GetValue(HorizontalTextAlignmentProperty); }
set { SetValue(HorizontalTextAlignmentProperty, value); }
}
public LineBreakMode LineBreakMode
{
get { return (LineBreakMode)GetValue(LineBreakModeProperty); }
set { SetValue(LineBreakModeProperty, value); }
}
public string Text
{
get { return (string)GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
public Color TextColor
{
get { return (Color)GetValue(TextElement.TextColorProperty); }
set { SetValue(TextElement.TextColorProperty, value); }
}
public TextAlignment VerticalTextAlignment
{
get { return (TextAlignment)GetValue(VerticalTextAlignmentProperty); }
set { SetValue(VerticalTextAlignmentProperty, value); }
}
[Obsolete("XAlign is obsolete as of version 2.0.0. Please use HorizontalTextAlignment instead.")]
public TextAlignment XAlign
{
get { return (TextAlignment)GetValue(XAlignProperty); }
set { SetValue(XAlignProperty, value); }
}
[Obsolete("YAlign is obsolete as of version 2.0.0. Please use VerticalTextAlignment instead.")]
public TextAlignment YAlign
{
get { return (TextAlignment)GetValue(YAlignProperty); }
set { SetValue(YAlignProperty, value); }
}
public FontAttributes FontAttributes
{
get { return (FontAttributes)GetValue(FontAttributesProperty); }
set { SetValue(FontAttributesProperty, value); }
}
public string FontFamily
{
get { return (string)GetValue(FontFamilyProperty); }
set { SetValue(FontFamilyProperty, value); }
}
[TypeConverter(typeof(FontSizeConverter))]
public double FontSize
{
get { return (double)GetValue(FontSizeProperty); }
set { SetValue(FontSizeProperty, value); }
}
double IFontElement.FontSizeDefaultValueCreator() =>
Device.GetNamedSize(NamedSize.Default, (Label)this);
void IFontElement.OnFontAttributesChanged(FontAttributes oldValue, FontAttributes newValue) =>
InvalidateMeasureInternal(InvalidationTrigger.MeasureChanged);
void IFontElement.OnFontFamilyChanged(string oldValue, string newValue) =>
InvalidateMeasureInternal(InvalidationTrigger.MeasureChanged);
void IFontElement.OnFontSizeChanged(double oldValue, double newValue) =>
InvalidateMeasureInternal(InvalidationTrigger.MeasureChanged);
void IFontElement.OnFontChanged(Font oldValue, Font newValue) =>
InvalidateMeasureInternal(InvalidationTrigger.MeasureChanged);
void OnFormattedTextChanged(object sender, PropertyChangedEventArgs e)
{
InvalidateMeasureInternal(InvalidationTrigger.MeasureChanged);
OnPropertyChanged("FormattedText");
}
static void OnHorizontalTextAlignmentPropertyChanged(BindableObject bindable, object oldValue, object newValue)
{
var label = (Label)bindable;
#pragma warning disable 0618 // retain until XAlign removed
label.OnPropertyChanged(nameof(XAlign));
#pragma warning restore 0618
}
static void OnTextPropertyChanged(BindableObject bindable, object oldvalue, object newvalue)
{
var label = (Label)bindable;
LineBreakMode breakMode = label.LineBreakMode;
bool isVerticallyFixed = (label.Constraint & LayoutConstraint.VerticallyFixed) != 0;
bool isSingleLine = !(breakMode == LineBreakMode.CharacterWrap || breakMode == LineBreakMode.WordWrap);
if (!isVerticallyFixed || !isSingleLine)
((Label)bindable).InvalidateMeasureInternal(InvalidationTrigger.MeasureChanged);
if (newvalue != null)
((Label)bindable).FormattedText = null;
}
static void OnVerticalTextAlignmentPropertyChanged(BindableObject bindable, object oldValue, object newValue)
{
var label = (Label)bindable;
#pragma warning disable 0618 // retain until YAlign removed
label.OnPropertyChanged(nameof(YAlign));
#pragma warning restore 0618
}
public IPlatformElementConfiguration<T, Label> On<T>() where T : IConfigPlatform
{
return _platformConfigurationRegistry.Value.On<T>();
}
void ITextElement.OnTextColorPropertyChanged(Color oldValue, Color newValue)
{
}
}
}
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