public bool CanMoveItemUp()
{
if (SelectedTreeViewItem == null)
{
return(false);
}
if (SelectedTreeViewItem is CategoryViewModel)
{
return(SubItems.CanMoveItemUp(SelectedTreeViewItem as CategoryViewModel));
}
else if (SelectedTreeViewItem is StoryViewModel)
{
StoryViewModel vm = SelectedTreeViewItem as StoryViewModel;
if (vm.Model.CategoryId == null)
{
return(SubItems.CanMoveItemUp(vm));
}
else
{
CategoryViewModel category = Categories.Single(i => i.Model.id == vm.Model.CategoryId);
return(category.Stories.CanMoveItemUp(vm));
}
}
else if (SelectedTreeViewItem is ChapterViewModel)
{
ChapterViewModel vm = SelectedTreeViewItem as ChapterViewModel;
return(vm.StoryVm.Chapters.CanMoveItemUp(vm));
}
else if (SelectedTreeViewItem is SceneViewModel)
{
SceneViewModel vm = SelectedTreeViewItem as SceneViewModel;
return(vm.ChapterVm.Scenes.CanMoveItemUp(vm));
}
return(false);
}