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-rw-r--r--Xamarin.Forms.Platform.WP8/FrameworkElementExtensions.cs73
1 files changed, 73 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.WP8/FrameworkElementExtensions.cs b/Xamarin.Forms.Platform.WP8/FrameworkElementExtensions.cs
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+++ b/Xamarin.Forms.Platform.WP8/FrameworkElementExtensions.cs
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+´╗┐using System;
+using System.Linq;
+using System.Reflection;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+
+namespace Xamarin.Forms.Platform.WinPhone
+{
+ internal static class FrameworkElementExtensions
+ {
+ static readonly Lazy<ConcurrentDictionary<Type, DependencyProperty>> ForegroundProperties =
+ new Lazy<ConcurrentDictionary<Type, DependencyProperty>>(() => new ConcurrentDictionary<Type, DependencyProperty>());
+
+ public static Brush GetForeground(this FrameworkElement element)
+ {
+ if (element == null)
+ throw new ArgumentNullException("element");
+
+ return (Brush)element.GetValue(GetForegroundProperty(element));
+ }
+
+ public static System.Windows.Data.Binding GetForegroundBinding(this FrameworkElement element)
+ {
+ System.Windows.Data.BindingExpression expr = element.GetBindingExpression(GetForegroundProperty(element));
+ if (expr == null)
+ return null;
+
+ return expr.ParentBinding;
+ }
+
+ public static void SetForeground(this FrameworkElement element, Brush foregroundBrush)
+ {
+ if (element == null)
+ throw new ArgumentNullException("element");
+
+ element.SetValue(GetForegroundProperty(element), foregroundBrush);
+ }
+
+ public static void SetForeground(this FrameworkElement element, System.Windows.Data.Binding binding)
+ {
+ if (element == null)
+ throw new ArgumentNullException("element");
+
+ element.SetBinding(GetForegroundProperty(element), binding);
+ }
+
+ static DependencyProperty GetForegroundProperty(FrameworkElement element)
+ {
+ if (element is Control)
+ return Control.ForegroundProperty;
+ if (element is TextBlock)
+ return TextBlock.ForegroundProperty;
+
+ Type type = element.GetType();
+
+ DependencyProperty foregroundProperty;
+ if (!ForegroundProperties.Value.TryGetValue(type, out foregroundProperty))
+ {
+ FieldInfo field = type.GetFields(BindingFlags.Public | BindingFlags.Static).FirstOrDefault(f => f.Name == "ForegroundProperty");
+ if (field == null)
+ throw new ArgumentException("type is not a Foregroundable type");
+
+ var property = (DependencyProperty)field.GetValue(null);
+ ForegroundProperties.Value.TryAdd(type, property);
+
+ return property;
+ }
+
+ return foregroundProperty;
+ }
+ }
+} \ No newline at end of file