private void StartNavigation(PageGroupItem item, object vm, int?stateId)
{
var navigator = item.CreateNavigator(vm);
// ページ群内ナビゲーションがキャンセルじゃなくて、明示的終了した時には NavigateBack を呼ぶ。
_current = new NavigationState(navigator, vm, stateId, NavigateBackAsync);
CurrentPageKey = item.Key;
}
public void Add(PageGroupItem item)
{
if (StartPageKey == null)
{
StartPageKey = item.Key;
}
item.Navigator = this;
_table.Add(item.Key, item);
}
private async Task NavigateAsync(PageGroupItem item, bool pushHistory)
{
var vm = item.CreateViewModel();
await NavigateAsync(item, vm, null, pushHistory);
}
private async Task NavigateAsync(PageGroupItem item, object vm, int?stateId, bool pushHistory)
{
await CloseAsync(pushHistory);
StartNavigation(item, vm, stateId);
}
internal Task NavigateAsync(PageGroupItem item)
{
return(NavigateAsync(item, true));
}