Question

我有一个问题，这让我发疯：

当我第一次进入“停止列表”页面，回到菜单，然后进入“收藏夹”页面并单击并从列表中停止时，则ScrollIntoView无法正常运行所有应用程序。

但是..当我第一次进入Favouritepage，然后点击了一个sto然后ScrollIntoView可以运行所有时间的应用程序。

ListView1是ListView，我想要滚动，这些项目来自List<test>;

这是菜单代码，我正在切换页面：

    //favourite
    private void Button3_Click(object sender, RoutedEventArgs e)
    {
        if (!loaded)
            return;

        if(MainWindowStopList.loaded == false)
            MainPage.gui.setPage = typeof(Pages.MainWindowStopList); //cache page if not exist, to memory

        MainPage.gui.setPage = typeof(Pages.MainWindowFav);
        MainPage.gui.setBackButtonVisibility = Visibility.Visible;
    }
    //stops
    private void Button1_Click(object sender, RoutedEventArgs e)
    {
        if (!loaded) return;

        if (MainWindowFav.loaded == null)
            MainPage.gui.setPage = typeof(Pages.MainWindowFav); // this same, cache if not exist;

        MainPage.gui.setPage = typeof(Pages.MainWindowStopList);

        MainPage.gui.setBackButtonVisibility = Visibility.Visible;
    }

代码在哪里，我从收藏夹导航到 MainWindowStopList.preparefromfav(HTMLServices.przystankinames.ElementAt(item.id)); MainPage.gui.setPage = typeof(MainWindowStopList);

以下是函数，我在MainWindowStopList中使用ListView1执行某些操作：

    public MainWindowStopList()
    {
        this.InitializeComponent();

        gui = this;

        lista2 = new List<test>();
        lista3 = new ObservableCollection<test3>();
        selectedPrzystanek = new PrzystankiNames();

        ListView1.SelectionChanged += (se, fe) =>
        {
            (se as ListView).ScrollIntoView(tempPrzystankiNames);

            //if above not works from stackoverflow
            var lv = se as ListView;
            DispatcherTimer dt = new DispatcherTimer();
            dt.Interval = TimeSpan.FromSeconds(2);
            dt.Tick += (o, o1) =>
            {
                dt.Stop();
                lv.ScrollIntoView(tempPrzystankiNames);

            };
            dt.Start();
        };

        this.Loaded += (s, f) =>
        {
            if (!string.IsNullOrEmpty(tempPrzystankiNames.name))
                ListView1.SelectedIndex = lista.IndexOf(tempPrzystankiNames);
        };
    }

    public static void preparefromfav(PrzystankiNames pr)
    {
        if(gui.ListViewSearchable.Visibility == Visibility.Visible)
        {
            gui.ListViewSearchable.Visibility = Visibility.Collapsed;
            gui.ListView1.Visibility = Visibility.Visible;
        }

        Grid.SetColumnSpan(gui.ListView1, 1);
        gui.ResultListView.Visibility = Visibility.Visible;

        gui.tempPrzystankiNames = pr;
        gui.showListView2(pr); //here i'm doing nothing with listview
    }

    private void reset(object sender)
    {
        navigated_from = false;
        foreach (ListView gr in MainWindowLinesInfoHours.FindVisualChildren<ListView>(this))
        {
            if (gr == sender || gr == ListView1 || gr == ListViewSearchable)
                continue;

            gr.SelectedIndex = -1; 
        }
    }

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        reset(new object());
    }

那么，为什么这个滚动不起作用？有人有任何想法吗？

UWP ListView ScrollIntoView无法正常工作

0 个答案: