private Task <bool> SetCurrentModelAsync(MainContentViewModelBase viewModel)
{
if (CurrentModel == viewModel)
{
return(TaskConstants.BooleanFalse);
}
Task <bool> allowChangeTask = CurrentModel != null
? CurrentModel.OnContentChange()
: TaskConstants.BooleanTrue;
if (allowChangeTask.IsCompleted && allowChangeTask.Result)
{
CurrentModel = viewModel;
}
else
{
SetCurrentModelAsync(viewModel, allowChangeTask);
}
return(allowChangeTask);
}