DragHandleAutoScroller class

Auto-scrolls a given ScrollPosition based on the current position of a drag handle near the boundary of the scroll region.

Clients of this object provide access to a desired ScrollPosition and a viewport RenderBox. Clients also update this object whenever the drag handle moves. Then, this object starts/stops auto-scrolling the given ScrollPosition as needed, based on how close the drag handle position sits to the edge of the scrollable boundary.

Constructors

DragHandleAutoScroller({required TickerProvider vsync, required AxisOffset dragAutoScrollBoundary, required ScrollPosition getScrollPosition(), required RenderBox getViewportBox()})

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

dispose() → void

ensureOffsetIsVisible(Offset offsetInViewport) → void

Jumps to a scroll offset so that the given offsetInViewport is visible within the viewport boundary.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

startAutoScrollHandleMonitoring() → void

Prepares this auto-scroller to automatically scroll its ScrollPosition based on calls to updateAutoScrollHandleMonitoring.

stopAutoScrollHandleMonitoring() → void

Stops any on-going auto-scrolling and removes references there were setup in startAutoScrollHandleMonitoring.

toString() → String

A string representation of this object.

inherited

updateAutoScrollHandleMonitoring({required Offset dragEndInViewport}) → void

Starts/stops auto-scrolling as necessary, based on the given dragEndInViewport and viewportHeight.

Operators

operator ==(Object other) → bool

The equality operator.

inherited