internal bool GetOrCreateStep(NovaTreeNodeStep treeStep, out IView view)
{
view = null;
if (treeStep.GroupId != _groupId)
{
return(false);
}
var viewType = treeStep.PageType;
var viewModelType = treeStep.ViewModelType;
var node = CurrentView.List.First;
while (node != null)
{
var novaStep = node.Value;
if (novaStep.ViewType == viewType && novaStep.ViewModelType == viewModelType)
{
break;
}
node = node.Next;
}
if (node == null || node.Value == null)
{
return(false);
}
view = node.Value.GetOrCreateView(this);
return(true);
}
/// <summary>
/// Builds the nova treenode step.
/// </summary>
/// <param name="page">The page.</param>
/// <returns></returns>
internal override NovaTreeNodeStep Build(INavigatablePage page)
{
var command = page.CreateNavigationalAction <TView, TViewModel>(Id, _parameters);
var node = new NovaTreeNodeStep <TView, TViewModel>(Id, Title, command);
return(node);
}
internal bool HasStep(NovaTreeNodeStep treeStep)
{
if (treeStep.GroupId != _groupId)
{
return(false);
}
var stepId = treeStep.Id;
return(_steps.Any(x => x.NodeId == stepId));
}
public override bool Execute()
{
var actionContextEntries = ActionContext.GetEntries().ToList();
_viewType = ActionContext.GetValue <Type>(ActionContextConstants.ViewTypeConstant);
_viewModelType = ActionContext.GetValue <Type>(ActionContextConstants.ViewModelTypeConstant);
var currentlyInsideMultistep = typeof(IMultistepContentViewModel).IsAssignableFrom(_viewModelType);
var triggerValidation = !currentlyInsideMultistep;
NovaTreeNodeStep novaTreeNodeStep = null;
var hasStep = false;
if (currentlyInsideMultistep)
{
Guid key;
if (!ActionContext.TryGetValue(ActionContextConstants.NodeId, out key))
{
throw new NotSupportedException("Navigating to a multistep view without providing a step key is not supported.");
}
novaTreeNodeStep = View._NovaTree.FindStep(key);
if (novaTreeNodeStep == null)
{
throw new NotSupportedException("Navigating to an unknown step.");
}
var multistep = _current as MultiStepView;
if (multistep != null)
{
hasStep = multistep.HasStep(novaTreeNodeStep);
triggerValidation = !hasStep;
}
}
var triggerEntry = ActionContextEntry.Create(ActionContextConstants.TriggerValidation, triggerValidation, false);
actionContextEntries.Add(triggerEntry);
var entries = actionContextEntries.ToArray();
return(LeavePreviousView(entries) && CreateNextView(currentlyInsideMultistep, novaTreeNodeStep, hasStep, entries));
}
private void CreateMultistep(NovaTreeNodeStep novaTreeNodeStep, bool hasChild)
{
var multistep = _current as MultiStepView;
_navigatingInsideMultiStep = hasChild && multistep != null && Dispatch(() => multistep.GetOrCreateStep(novaTreeNodeStep, out _nextView));
if (_navigatingInsideMultiStep)
{
return;
}
//Create new one.
var steps = novaTreeNodeStep.Parent.Steps.Select(x => x.ConvertToNovaStep());
var list = new LinkedList <NovaStep>(steps);
var initialView = GetInitialView(novaTreeNodeStep, list);
var groupId = novaTreeNodeStep.GroupId;
_nextView = Dispatch(() => new MultiStepView(View, ViewModel, groupId, initialView));
}
private bool CreateNextView(bool currentlyInsideMultistep, NovaTreeNodeStep novaTreeNodeStep, bool hasStep,
ActionContextEntry[] entries)
{
if (currentlyInsideMultistep)
{
CreateMultistep(novaTreeNodeStep, hasStep);
}
else
{
CreateNormalView();
}
var result = _nextView != null && _nextView.ViewModel.Enter(entries).Result;
if (result)
{
return(true);
}
CreateNotAvailableView();
return(true);
}
