public void TestFindDescendent()
{
// Test a deep find
IList <View> descendents = ViewSupport.FindDescendent(top, child_2_2_1);
Assert.AreEqual(2, descendents.Count);
Assert.AreEqual(child_2, descendents[0]);
Assert.AreEqual(child_2_2, descendents[1]);
descendents = ViewSupport.FindDescendent(top, child_2_1_1);
Assert.AreEqual(2, descendents.Count);
Assert.AreEqual(child_2, descendents[0]);
Assert.AreEqual(child_2_1, descendents[1]);
descendents = ViewSupport.FindDescendent(top, child_2_1);
Assert.AreEqual(1, descendents.Count);
Assert.AreEqual(child_2, descendents[0]);
// Test a shallow find
descendents = ViewSupport.FindDescendent(top, child_2);
Assert.AreEqual(0, descendents.Count);
// Test a no find
descendents = ViewSupport.FindDescendent(top, new SupportSchemaNeutralView());
Assert.AreEqual(null, descendents);
}
/// <summary>
/// Removes a view from a parent view returning the orphaned parent views in a list.
/// </summary>
/// <param name="parentViewable">parent to remove view from</param>
/// <param name="viewToRemove">view to remove</param>
/// <returns>
/// chain of orphaned views
/// </returns>
/// <exception cref="System.ArgumentException"></exception>
/// <exception cref="IllegalStateException">
/// </exception>
protected internal static IList <View> RemoveChainLeafView(Viewable parentViewable, Viewable viewToRemove)
{
IList <View> removedViews = new List <View>();
// The view to remove must be a leaf node - non-leaf views are just not removed
if (viewToRemove.HasViews)
{
return(removedViews);
}
// Find child viewToRemove among descendent views
IList <View> viewPath = ViewSupport.FindDescendent(parentViewable, viewToRemove);
if (viewPath == null)
{
String message = "Viewable not found when removing view " + viewToRemove;
throw new ArgumentException(message);
}
// The viewToRemove is a direct child view of the stream
if (viewPath.IsEmpty())
{
bool isViewRemoved = parentViewable.RemoveView((View)viewToRemove);
if (!isViewRemoved)
{
String message = "Failed to remove immediate child view " + viewToRemove;
Log.Fatal(".remove " + message);
throw new IllegalStateException(message);
}
removedViews.Add((View)viewToRemove);
return(removedViews);
}
View[] viewPathArray = viewPath.ToArray();
View currentView = (View)viewToRemove;
// Remove child from parent views until a parent view has more children,
// or there are no more parents (index=0).
for (int index = viewPathArray.Length - 1; index >= 0; index--)
{
bool isViewRemoved = viewPathArray[index].RemoveView(currentView);
removedViews.Add(currentView);
if (!isViewRemoved)
{
String message = "Failed to remove view " + currentView;
Log.Fatal(".remove " + message);
throw new IllegalStateException(message);
}
// If the parent views has more child views, we are done
if (viewPathArray[index].HasViews)
{
break;
}
// The parent of the top parent is the stream, remove from stream
if (index == 0)
{
parentViewable.RemoveView(viewPathArray[0]);
removedViews.Add(viewPathArray[0]);
}
else
{
currentView = viewPathArray[index];
}
}
return(removedViews);
}
