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attached behavior for scroll viewers to throttle touch pad scrolling #1592

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attached behavior for scroll viewers to throttle touch pad scrolling #1592

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4b27719
attached behavior for scroll viewers to throttle touch pad scrolling
vicdotexe Oct 19, 2024
91a2562
Merge branch 'NetStandard' into vicdotexe/1555-touchpad-scrolling
vchelaru Oct 21, 2024
7d949cc
Merge branch 'NetStandard' into vicdotexe/1555-touchpad-scrolling
vchelaru Oct 21, 2024
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43 changes: 43 additions & 0 deletions FRBDK/Glue/Glue/Themes/Converters/ScrollThrottleBehavior.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,43 @@
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace FlatRedBall.Glue.Themes.Converters;

public static class ScrollThrottleBehavior
{
public static readonly DependencyProperty IsEnabledProperty =
DependencyProperty.RegisterAttached(
"IsEnabled",
typeof(bool),
typeof(ScrollThrottleBehavior),
new PropertyMetadata(false, OnIsEnabledChanged));

public static bool GetIsEnabled(ScrollViewer obj) => (bool)obj.GetValue(IsEnabledProperty);
public static void SetIsEnabled(ScrollViewer obj, bool value) => obj.SetValue(IsEnabledProperty, value);

private static void OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (d is ScrollViewer scrollViewer
)
{
if ((bool)e.NewValue)
{
scrollViewer.PreviewMouseWheel += OnMouseWheel;
}
else
{
scrollViewer.PreviewMouseWheel -= OnMouseWheel;
}
}
}

private static void OnMouseWheel(object sender, MouseWheelEventArgs e)
{
if (sender is ScrollViewer scrollViewer && System.Math.Abs(e.Delta) != 120)
{
scrollViewer.ScrollToVerticalOffset(scrollViewer.VerticalOffset + ((double)e.Delta /120));
e.Handled = true;
}
}
}
4 changes: 3 additions & 1 deletion FRBDK/Glue/Glue/Themes/Frb.Styles.xaml
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Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,9 @@
<Setter Property="TextOptions.TextRenderingMode" Value="Auto" />
</Style>

<Style TargetType="{x:Type ScrollViewer}" BasedOn="{StaticResource MaterialDesignScrollViewer}" />
<Style TargetType="{x:Type ScrollViewer}" BasedOn="{StaticResource MaterialDesignScrollViewer}">
<Setter Property="converters:ScrollThrottleBehavior.IsEnabled" Value="True" />
</Style>

<Style TargetType="{x:Type ScrollBar}" BasedOn="{StaticResource MaterialDesignScrollBar}">
<Style.Resources>
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