Android como ScrollBar para WPF ListView

How to have android like scrollbars for my WPF ListView. I mean to say, the scrollbar should be visible only when the user scrolls. They should fade out as soon as the user stops scrolling. How to achieve this?

preguntado el 28 de mayo de 14 a las 11:05

1 Respuestas

Puede utilizar el DispatcherTimer clase de la System.Windows.Threading espacio de nombres
Here is the XAML markup for your window:

<Window x:Class="testwpf.MainWindow"
    <ListView Name="list" ScrollViewer.VerticalScrollBarVisibility="Hidden" Loaded="list_Loaded">

Y aquí está el código detrás:

public partial class MainWindow : Window
    DispatcherTimer dispatcherTimer;

    public MainWindow()

        dispatcherTimer = new DispatcherTimer();
        dispatcherTimer.Tick += dispatcherTimer_Tick;

    private void dispatcherTimer_Tick(object sender, EventArgs e)
        // we are here only if for the last 500 ms there were no changes of
        // the scrollbar's vertical offset and we can hide a scrollbar
        list.SetValue(ScrollViewer.VerticalScrollBarVisibilityProperty, ScrollBarVisibility.Hidden);

    private void list_Loaded(object sender, RoutedEventArgs e)
        // attach a handler
        Decorator border = VisualTreeHelper.GetChild(list, 0) as Decorator;
        ScrollViewer scroll = border.Child as ScrollViewer;
        scroll.ScrollChanged += list_ScrollChanged;

    private void list_ScrollChanged(object sender, ScrollChangedEventArgs e)
        // when vertical scroll position is changed, we set VerticalScrollBarVisibilityProperty 
        // to Auto (scroll bar is displayed only if needed) and run a timer with 500 ms interval
        if (e.VerticalChange != 0)
            list.SetValue(ScrollViewer.VerticalScrollBarVisibilityProperty, ScrollBarVisibility.Auto);
            dispatcherTimer.Interval = new TimeSpan(0, 0, 0, 0, 500);

This is a raw example. Of course, you can apply your own conditions defining whether you should hide a scrollbar. For example, you might decide not to hide a scrollbar if left mouse button is still pressed over a scrollbar.

contestado el 28 de mayo de 14 a las 12:05

-1 How on earth did you figure that a DispatcherTimer would help? Surely, you'd just need to change the Opacity en el capítulo respecto a la MouseOver ¿evento? - Sheridan

@Sheridan, probably I haven't understood the problem correctly. I thought that a scrollbar should become visible when user scrolls the content and it can be done not only over a scrollbar area, but also with mouse wheel and keys. But, alas, I didn't think about Opacity y MouseOver event, thank you :) - undermind

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