/// <summary>
/// Initializes the control and child controls.
/// </summary>
private void Initialize()
{
// Access internal children, which forces instantiation of the generator
UIElementCollection children = base.InternalChildren;
// We are an items host
IsItemsHost = true; // TODO: Should do based on parent container or selector?
// Create the transition element
transitionElement = new TransitionElement();
}
private static object CoerceTransition(object element, object value)
{
Debug.WriteLineIf(TraceSwitches.Transitions.TraceVerbose, "TransitionElement - CoerceTransition Entry");
TransitionElement te = (TransitionElement)element;
if (te.IsTransitioning)
{
Debug.WriteLineIf(TraceSwitches.Transitions.TraceVerbose, "TransitionElement - CoerceTransition returning active transition");
return(te.activeTransition);
}
Debug.WriteLineIf(TraceSwitches.Transitions.TraceVerbose, "TransitionElement - CoerceTransition returning normal current transition");
return(value);
}
/// <summary>
/// Handles a change to the Content property.
/// </summary>
private static void OnContentChanged(object element, DependencyPropertyChangedEventArgs e)
{
Debug.WriteLineIf(TraceSwitches.Transitions.TraceVerbose, "TransitionElement - OnContentChanged Entry");
TransitionElement te = element as TransitionElement;
if (te != null)
{
ContentPresenter contentPresenter = te.Content as ContentPresenter;
FrameworkElement parentFE = te.Parent as FrameworkElement;
Debug.WriteLineIf(TraceSwitches.Transitions.TraceVerbose, "TransitionElement - OnContentChanged Beginning Transition");
te.BeginTransition();
}
}
// Don't update direct content until done transitioning
private static object CoerceContent(object element, object value)
{
Debug.WriteLineIf(TraceSwitches.Transitions.TraceVerbose, "TransitionElement - CoerceContent Entry");
TransitionElement te = element as TransitionElement;
if (te != null && te.IsTransitioning)
{
Debug.WriteLineIf(TraceSwitches.Transitions.TraceVerbose, "TransitionElement - CoerceContent returning te.CurrentContentPresenter.Content");
return(te.NewContentPresenter.Content);
}
Debug.WriteLineIf(TraceSwitches.Transitions.TraceVerbose, "TransitionElement - CoerceContent returning normal value");
return(value);
}
// Force clip to be true if the active Transition requires it
private static object CoerceClipToBounds(object element, object value)
{
TransitionElement te = (TransitionElement)element;
bool clip = (bool)value;
if (!clip && te.IsTransitioning)
{
Transition transition = te.Transition;
if (transition.ClipToBounds)
{
return(true);
}
}
return(value);
}
private static void OnContentTemplateSelectorChanged(object element, DependencyPropertyChangedEventArgs e)
{
TransitionElement te = (TransitionElement)element;
te.NewContentPresenter.ContentTemplateSelector = (DataTemplateSelector)e.NewValue;
}
