better-genshin-impact/Build/MicaSetup/Design/Controls/ScrollViewer/ScrollViewerHelper.cs

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace MicaSetup.Design.Controls;

public class ScrollViewerHelper
{
    public static Brush GetTrackBrush(DependencyObject obj)
    {
        return (Brush)obj.GetValue(TrackBrushProperty);
    }

    public static void SetTrackBrush(DependencyObject obj, Brush value)
    {
        obj.SetValue(TrackBrushProperty, value);
    }

    public static readonly DependencyProperty TrackBrushProperty = DependencyProperty.RegisterAttached("TrackBrush", typeof(Brush), typeof(ScrollViewerHelper));

    public static Brush GetThumbBrush(DependencyObject obj)
    {
        return (Brush)obj.GetValue(ThumbBrushProperty);
    }

    public static void SetThumbBrush(DependencyObject obj, Brush value)
    {
        obj.SetValue(ThumbBrushProperty, value);
    }

    public static readonly DependencyProperty ThumbBrushProperty = DependencyProperty.RegisterAttached("ThumbBrush", typeof(Brush), typeof(ScrollViewerHelper));

    public static CornerRadius GetScrollBarCornerRadius(DependencyObject obj)
    {
        return (CornerRadius)obj.GetValue(ScrollBarCornerRadiusProperty);
    }

    public static void SetScrollBarCornerRadius(DependencyObject obj, CornerRadius value)
    {
        obj.SetValue(ScrollBarCornerRadiusProperty, value);
    }

    public static readonly DependencyProperty ScrollBarCornerRadiusProperty = DependencyProperty.RegisterAttached("ScrollBarCornerRadius", typeof(CornerRadius), typeof(ScrollViewerHelper));

    public static double GetScrollBarThickness(DependencyObject obj)
    {
        return (double)obj.GetValue(ScrollBarThicknessProperty);
    }

    public static void SetScrollBarThickness(DependencyObject obj, double value)
    {
        obj.SetValue(ScrollBarThicknessProperty, value);
    }

    public static readonly DependencyProperty ScrollBarThicknessProperty = DependencyProperty.RegisterAttached("ScrollBarThickness", typeof(double), typeof(ScrollViewerHelper));

    internal static bool GetScrollViewerHook(DependencyObject obj)
    {
        return (bool)obj.GetValue(ScrollViewerHookProperty);
    }

    internal static void SetScrollViewerHook(DependencyObject obj, bool value)
    {
        obj.SetValue(ScrollViewerHookProperty, value);
    }

    internal static readonly DependencyProperty ScrollViewerHookProperty = DependencyProperty.RegisterAttached("ScrollViewerHook", typeof(bool), typeof(ScrollViewerHelper), new PropertyMetadata(OnScrollViewerHookChanged));

    private static void OnScrollViewerHookChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var scrollViewer = d as ScrollViewer;
        scrollViewer!.PreviewMouseWheel += ScrollViewer_PreviewMouseWheel;
    }

    private static void ScrollViewer_PreviewMouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e)
    {
        var scrollViewer = sender as ScrollViewer;
        var handle = true;

        if (e.Delta > 0)
        {
            if (scrollViewer!.ComputedVerticalScrollBarVisibility == Visibility.Visible)
            { handle = false; }
            else if (scrollViewer.ComputedHorizontalScrollBarVisibility == Visibility.Visible)
                scrollViewer.LineLeft();
            else if (scrollViewer.VerticalScrollBarVisibility != ScrollBarVisibility.Disabled)
            { handle = false; }
            else if (scrollViewer.HorizontalScrollBarVisibility != ScrollBarVisibility.Disabled)
                scrollViewer.LineLeft();
            else
                return;
        }
        else
        {
            if (scrollViewer!.ComputedVerticalScrollBarVisibility == Visibility.Visible)
            { handle = false; }
            else if (scrollViewer.ComputedHorizontalScrollBarVisibility == Visibility.Visible)
                scrollViewer.LineRight();
            else if (scrollViewer.VerticalScrollBarVisibility != ScrollBarVisibility.Disabled)
            { handle = false; }
            else if (scrollViewer.HorizontalScrollBarVisibility != ScrollBarVisibility.Disabled)
                scrollViewer.LineRight();
            else
                return;
        }

        if (handle)
            e.Handled = true;
    }
}