public FrameInfo(Frame frame, int index, int priority, ModalViewController modalViewController = null)
{
Frame = frame;
Index = index;
Priority = priority;
ModalViewController = modalViewController;
State = FrameState.Hidden;
}
/// <summary>
/// Gets or creates a Frame with the specified name and priority.
/// </summary>
/// <param name="name">The name of the Frame to retrieve or create.</param>
/// <param name="priority">The priority determines the Z order of the view. It's only used when creating a new Frame.</param>
/// <param name="transitionInfoType">The transition info type to determine how to create the Frame.</param>
public Frame GetOrCreateFrame(string name, int priority, FrameSectionsTransitionInfoTypes transitionInfoType) // Must run on UI thread
{
if (_frames.TryGetValue(name, out var existingFrame))
{
return(existingFrame.Frame);
}
else
{
var frame = new Frame()
{
Name = name,
Opacity = 0,
IsHitTestVisible = false,
RenderTransform = new TranslateTransform()
};
var framesAbove = _frames.Values.Where(fi => fi.Priority > priority).ToList();
var index = _frames.Count - framesAbove.Count;
FrameInfo frameState;
switch (transitionInfoType)
{
case FrameSectionsTransitionInfoTypes.FrameBased:
foreach (var frameAbove in framesAbove)
{
++frameAbove.Index;
}
frameState = new FrameInfo(frame, index, priority);
Children.Insert(index, frame);
break;
case FrameSectionsTransitionInfoTypes.UIViewControllerBased:
if (framesAbove.Any())
{
throw new InvalidOperationException("A UIViewController-based modal must be above all others.");
}
var modalViewController = new ModalViewController(name, frame);
modalViewController.ClosedNatively += OnModalViewControllerClosed;
frameState = new FrameInfo(frame, index, priority, modalViewController);
break;
default:
throw new InvalidOperationException($"Unsupported transition info type '{transitionInfoType}'.");
}
_frames.Add(name, frameState);
return(frame);
}
}
