WinUI ScrollViewer Techniques

ScrollViewer provides a viewport for content that extends beyond the available space. Configure it to respond smoothly to touch, mouse, pen, and keyboard input while maintaining high performance on large pages.

Overview

• Wrap content-heavy layouts in ScrollViewer to keep information accessible on small displays.
• Pair with ItemsRepeater or ListView for dynamic data so virtualization reduces memory usage.
• Use ViewChanged to trigger lazy loading, analytics, or sticky header logic as users explore the page.

Prerequisites

• WinUI 3 project referencing Microsoft.UI.Xaml.Controls.ScrollViewer
• Basic understanding of layout containers (Grid, StackPanel, ItemsRepeater)
• Familiarity with input guidelines for Windows desktop and tablet experiences

Customize ScrollBar margin

Adjust scrollbar spacing through scoped styles to align with your layout chrome.

<ScrollViewer>
    <ScrollViewer.Resources>
        <Style TargetType="ScrollBar">
            <Setter Property="Margin" Value="0,0,-10,0" />
        </Style>
    </ScrollViewer.Resources>

    <!-- Content layout -->
</ScrollViewer>

Test both left-to-right and right-to-left layouts when using negative margins so the scrollbar remains inside the safe area.

Enhance touch and keyboard input

• Touch inertia: Keep IsScrollInertiaEnabled="True" for natural fling gestures. Disable only when precision scrolling is critical.
• Keyboard shortcuts: Listen for PageUp, PageDown, Home, and End key presses and call ChangeView to move the viewport predictably.
• Focus management: Move focus into the first focusable child inside the viewer so screen reader users enter the content without extra keystrokes.

Performance tips

• Lazy load heavy visuals: Defer loading charts or media until they scroll into view to reduce initial render time.
• Zoom responsibly: When enabling ZoomMode, provide a reset command and limit zoom levels to avoid excessive memory usage.
• Suspend background work: Pause video playback or animations once they exit the viewport to keep CPU/GPU usage low.