/
BindableObjectExtensions.cs
71 lines (59 loc) · 2.32 KB
/
BindableObjectExtensions.cs
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq.Expressions;
namespace Xamarin.Forms
{
public static class BindableObjectExtensions
{
internal static void PropagateBindingContext<T>(this BindableObject self, IList<T> children)
{
PropagateBindingContext(self, children, BindableObject.SetInheritedBindingContext);
}
internal static void PropagateBindingContext<T>(this BindableObject self, IList<T> children, Action<BindableObject, object> setChildBindingContext)
{
if (children == null || children.Count == 0)
return;
var bc = self.BindingContext;
for (var i = 0; i < children.Count; i++)
{
var bo = children[i] as BindableObject;
if (bo == null)
continue;
setChildBindingContext(bo, bc);
}
}
public static void SetBinding(this BindableObject self, BindableProperty targetProperty, string path, BindingMode mode = BindingMode.Default, IValueConverter converter = null,
string stringFormat = null)
{
if (self == null)
throw new ArgumentNullException("self");
if (targetProperty == null)
throw new ArgumentNullException("targetProperty");
var binding = new Binding(path, mode, converter, stringFormat: stringFormat);
self.SetBinding(targetProperty, binding);
}
[Obsolete]
[EditorBrowsable(EditorBrowsableState.Never)]
public static void SetBinding<TSource>(this BindableObject self, BindableProperty targetProperty, Expression<Func<TSource, object>> sourceProperty, BindingMode mode = BindingMode.Default,
IValueConverter converter = null, string stringFormat = null)
{
if (self == null)
throw new ArgumentNullException(nameof(self));
if (targetProperty == null)
throw new ArgumentNullException(nameof(targetProperty));
if (sourceProperty == null)
throw new ArgumentNullException(nameof(sourceProperty));
Binding binding = Binding.Create(sourceProperty, mode, converter, stringFormat: stringFormat);
self.SetBinding(targetProperty, binding);
}
public static T GetPropertyIfSet<T>(this BindableObject bindableObject, BindableProperty bindableProperty, T returnIfNotSet)
{
if (bindableObject == null)
return returnIfNotSet;
if (bindableObject.IsSet(bindableProperty))
return (T)bindableObject.GetValue(bindableProperty);
return returnIfNotSet;
}
}
}