public static object CheckedGetValue(this DependencyObject dependencyObject, DependencyProperty dependencyProperty)
{
dependencyProperty.AssertParameterNotNull("dependencyProperty");
return(dependencyObject.
AssertNotNull(dependencyProperty.Name).
GetValue(dependencyProperty));
}
public static void CheckedSetValue(this DependencyObject dependencyObject, DependencyProperty dependencyProperty, object value)
{
dependencyProperty.AssertParameterNotNull("dependencyProperty");
dependencyObject.
AssertNotNull(dependencyProperty.Name).
SetValue(dependencyProperty, value);
}
public static DependencyObject GetVisualParent(this DependencyObject dependencyObject)
{
dependencyObject.AssertNotNull(nameof(dependencyObject));
return(dependencyObject.CaseType((Visual v) => VisualTreeHelper.GetParent(v)).
CaseType((FrameworkContentElement f) => f.Parent).
Default(o => throw new NotSupportedException($"DependencyObject.GetVisualParent() does not support type {o.GetType().Name}. \n " +
$"The only supported types are {typeof(Visual).Name} and {typeof(FrameworkContentElement).Name}.")).
Result);
}
public static void SetBinding(this DependencyObject target, DependencyProperty property, object source, string sourcePath)
{
target.AssertNotNull(nameof(target));
BindingOperations.SetBinding(target, property, new Binding(sourcePath)
{
Source = source
});
}
public static IEnumerable <DependencyObject> TraverseUpVisual(this DependencyObject self)
{
self.AssertNotNull(nameof(self));
while (self != null)
{
yield return(self);
self = VisualTreeHelper.GetParent(self);
}
}
public static IEnumerable <DependencyObject> GetVisualChildren(this DependencyObject self)
{
self.AssertNotNull(nameof(self));
var childCount = VisualTreeHelper.GetChildrenCount(self);
for (var i = 0; i < childCount; i++)
{
yield return(VisualTreeHelper.GetChild(self, i));
}
}
public static IEnumerable <DependencyObject> GetVisualChildren(this DependencyObject dependencyObject, Predicate <DependencyObject> predicate = null)
{
dependencyObject.AssertNotNull(nameof(dependencyObject));
predicate = predicate ?? (o => true);
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(dependencyObject); i++)
{
var visualChild = dependencyObject.GetVisualChild(i);
if (predicate(visualChild))
{
yield return(dependencyObject.GetVisualChild(i));
}
}
}
public static void SetBinding(this DependencyObject target, DependencyProperty property, string sourcePath, IValueConverter converter, object converterParam = null, object source = null)
{
target.AssertNotNull(nameof(target));
var binding = new Binding(sourcePath)
{
Converter = converter,
ConverterParameter = converterParam,
Source = source
};
BindingOperations.SetBinding(target, property, binding);
}
public static void BindConverter(this DependencyObject target, DependencyProperty property, IValueConverter converter, object sourceValue)
{
target.AssertNotNull(nameof(target));
var binding = new Binding
{
Converter = converter,
Source = sourceValue,
BindsDirectlyToSource = true
};
BindingOperations.SetBinding(target, property, binding);
}
public static IEnumerable <DependencyObject> GetVisualAncestors(this DependencyObject dependencyObject, Predicate <DependencyObject> predicate = null)
{
dependencyObject.AssertNotNull(nameof(dependencyObject));
predicate = predicate ?? (o => true);
DependencyObject parent = dependencyObject.GetVisualParent();
while (parent != null)
{
if (predicate(parent))
{
yield return(parent);
}
parent = parent.GetVisualParent();
}
}
public static DependencyObject FindVisualParent(this DependencyObject dependencyObject, Predicate <DependencyObject> predicate)
{
dependencyObject.AssertNotNull(nameof(dependencyObject));
predicate.AssertParameterNotNull(nameof(predicate));
var parent = dependencyObject.GetVisualParent();
while (parent != null)
{
if (predicate(parent))
{
return(parent);
}
parent = parent.GetVisualParent();
}
return(null);
}
public static IEnumerable <DependencyObject> GetVisualDescendants(this DependencyObject dependencyObject, Predicate <DependencyObject> predicate = null)
{
dependencyObject.AssertNotNull(nameof(dependencyObject));
predicate = predicate ?? (o => true);
var result = new List <DependencyObject>();
foreach (var child in dependencyObject.GetVisualChildren())
{
if (predicate(child))
{
result.Add(child);
}
result.AddRange(child.GetVisualDescendants(predicate));
}
return(result);
}
public static bool SetIsSealed(this DependencyObject self, bool isSealed)
{
self.AssertNotNull(nameof(self));
if (self.IsSealed == isSealed)
{
return(true);
}
var sealProperty = typeof(DependencyObject).GetProperty("DO_Sealed", BindingFlags.NonPublic | BindingFlags.GetField | BindingFlags.Instance | BindingFlags.DeclaredOnly);
if (sealProperty == null)
{
return(false);
}
else
{
sealProperty.SetValue(self, isSealed, null);
return(true);
}
}
public static bool IsVisualChildOf(this DependencyObject dependencyObject, DependencyObject ancestor)
{
dependencyObject.AssertNotNull(nameof(dependencyObject));
ancestor.AssertParameterNotNull(nameof(ancestor));
var parent = dependencyObject;
while (true)
{
parent = parent.GetVisualParent();
if (parent == ancestor)
{
return(true);
}
if (parent == null)
{
return(false);
}
}
}
public static IEnumerable <TChild> GetVisualChildrenOfType <TChild>(this DependencyObject dependencyObject) where TChild : DependencyObject
{
dependencyObject.AssertNotNull(nameof(dependencyObject));
return(dependencyObject.GetVisualChildren(o => (o is TChild)).Cast <TChild>());
}
public static IEnumerable <TObject> GetVisualAncestorsOfType <TObject>(this DependencyObject dependencyObject) where TObject : DependencyObject
{
dependencyObject.AssertNotNull(nameof(dependencyObject));
return(dependencyObject.GetVisualAncestors(o => (o is TObject)).Cast <TObject>());
}
public static TObject FindVisualParentOfType <TObject>(this DependencyObject dependencyObject) where TObject : DependencyObject
{
dependencyObject.AssertNotNull(nameof(dependencyObject));
return(dependencyObject.FindVisualParent(o => (o is TObject)) as TObject);
}
private static void SetIsDragInProgress(DependencyObject dependencyObject, bool isDragInProgress)
{
dependencyObject.AssertNotNull("dependencyObject");
dependencyObject.SetValue(isDragInProgressPropertyKey, isDragInProgress);
}
public static bool GetIsDragInProgress(DependencyObject dependencyObject)
{
dependencyObject.AssertNotNull("dependencyObject");
return((bool)dependencyObject.GetValue(IsDragInProgressProperty));
}
public static void SetDragParent(DependencyObject dependencyObject, FrameworkElement dragParent)
{
dependencyObject.AssertNotNull("dependencyObject");
dependencyObject.SetValue(DragParentProperty, dragParent);
}
public static FrameworkElement GetDragParent(DependencyObject dependencyObject)
{
dependencyObject.AssertNotNull("dependencyObject");
return(dependencyObject.GetValue(DragParentProperty) as FrameworkElement);
}
public static DependencyObject GetVisualChild(this DependencyObject dependencyObject, int childIndex)
{
dependencyObject.AssertNotNull(nameof(dependencyObject));
return(VisualTreeHelper.GetChild(dependencyObject, childIndex));
}
public static IEnumerable <DependencyObject> GetVisualChildrenDepthFirst(this DependencyObject self)
{
self.AssertNotNull(nameof(self));
return(GetVisualChildren(self).FlattenTreeDepthFirst(GetVisualChildren));
}
