dragtoscroll

Dragtoscroll is a user interface interaction pattern that enables scrolling of content by clicking or tapping and then dragging, rather than using a scrollbar, wheel, or swipe gestures alone. It is commonly used for horizontal and vertical scrolling in image galleries, product carousels, maps, and other large canvases where continuous dragging enhances navigation.

How it works in practice: the pattern relies on pointer input. When a drag starts, the system records the starting pointer position and the container’s initial scroll position. As the user drags, the content’s scroll position is updated by the negative of the pointer movement delta. When the drag ends, the dragging state is cleared. Modern implementations often use pointer events for a unified handling of mouse, touch, and pen input, and may employ requestAnimationFrame to smooth updates. Some libraries also simulate inertia so that a quick flick continues scrolling briefly after the drag ends.

Implementation considerations: the technique is typically applied to a scrollable container with overflow set to auto or hidden on appropriate axes. It is important to manage event listeners efficiently and consider passive listeners to improve scrolling performance. Inertia or momentum can enhance feel but requires careful tuning to remain predictable. Visual cues, such as cursor changes or drag-hints, help users understand the interaction.

Accessibility and usability: dragtoscroll should not impede keyboard navigation or screen readers. Providing alternative controls or instructions for users who cannot drag is advisable, and draggable regions should not trap focus or interfere with other interactive elements.

See also: drag-to-scroll, drag scrolling, pointer events, inertia scrolling.