private View NavigateToInternal(string navigationKey, object viewModel, bool isModal, bool isMessageBox)
{
var performAnimation = true;
var navigationKeyInstance = NavigationKey.Parse(navigationKey);
var parentViewInstanceKey = navigationKeyInstance.ParentViewInstanceKey;
var viewInstanceKey = navigationKeyInstance.ViewInstanceKey;
var viewKey = navigationKeyInstance.ViewKey;
var hasParent = navigationKeyInstance.HasParent;
var oldNode = _viewGroupCollectionManager.GetActiveNode();
ViewGroupNode newNode;
// if the navigation key refers to a parent e.g : "parentView/view"
if (hasParent)
{
if (_viewGroupCollectionManager.TryFindViewNode(viewInstanceKey, out newNode))
{
// activates an existing node
EnsuresViewHasParentAndMatch(newNode, parentViewInstanceKey);
_viewGroupCollectionManager.ActivateExistingNode(newNode);
// if the node already exists and the old and new nodes belong to the same group, do not animate
performAnimation = oldNode.List != newNode.List;
}
else
{
// activates a new node
EnsureParentViewExist(parentViewInstanceKey);
EnsureParentViewIsTopMost(parentViewInstanceKey);
newNode = CreateNewNodeFrom(viewInstanceKey, viewKey, viewModel, isModal, isMessageBox);
var parentNode = _viewGroupCollectionManager.FindViewNode(parentViewInstanceKey);
_viewGroupCollectionManager.ActivateNewNode(newNode, parentNode.List);
}
// perform asynchronous update of the UI
if (performAnimation)
{
_taskInvoker.Enqueue(
new Func <ViewGroupNode, ViewGroupNode, Task>(_workspaceAdapter.PerformUIActivation), oldNode,
newNode);
}
return(newNode.Value);
}
// if the navigation key has a simple form e.g : "view"
if (_viewGroupCollectionManager.TryFindViewNode(viewInstanceKey, out newNode))
{
// activates an existing node
newNode = _viewGroupCollectionManager.IsTopMostView(viewInstanceKey) ? newNode : newNode.List.Peek();
_viewGroupCollectionManager.ActivateExistingNode(newNode);
// if the node already exists and the old and new nodes belong to the same group, do not animate
performAnimation = oldNode.List != newNode.List;
}
else
{
// activates a new node
newNode = CreateNewNodeFrom(viewInstanceKey, viewKey, viewModel, isModal, isMessageBox);
_viewGroupCollectionManager.ActivateNewNode(newNode);
}
// perform asynchronous update of the UI
if (performAnimation)
{
_taskInvoker.Enqueue(
new Func <ViewGroupNode, ViewGroupNode, Task>(_workspaceAdapter.PerformUIActivation), oldNode,
newNode);
}
return(newNode.Value);
}
