widgets library

ScrollActivity class

Base class for scrolling activities like dragging and flinging.

Constructors

ScrollActivity(ScrollActivityDelegate _delegate): Initializes delegate for subclasses.

Properties

delegate → ScrollActivityDelegate: The delegate that this activity will use to actuate the scroll view.
read-only
isScrolling → bool: Whether performing this activity constitutes scrolling. [...]
read-only
shouldIgnorePointer → bool: Whether the scroll view should ignore pointer events while performing this activity.
read-only
velocity → double: If applicable, the velocity at which the scroll offset is currently independently changing (i.e. without external stimuli such as a dragging gestures) in logical pixels per second for this activity.
read-only
hashCode → int: The hash code for this object. [...]
read-only, inherited
runtimeType → Type: A representation of the runtime type of the object.
read-only, inherited

Methods

applyNewDimensions() → void: Called when the scroll view that is performing this activity changes its metrics.
dispatchOverscrollNotification(ScrollMetrics metrics, BuildContext context, double overscroll) → void: Dispatch an OverscrollNotification with the given metrics and overscroll.
dispatchScrollEndNotification(ScrollMetrics metrics, BuildContext context) → void: Dispatch a ScrollEndNotification with the given metrics and overscroll.
dispatchScrollStartNotification(ScrollMetrics metrics, BuildContext context) → void: Dispatch a ScrollStartNotification with the given metrics.
dispatchScrollUpdateNotification(ScrollMetrics metrics, BuildContext context, double scrollDelta) → void: Dispatch a ScrollUpdateNotification with the given metrics and scroll delta.
dispose() → void: Called when the scroll view stops performing this activity.
@mustCallSuper
resetActivity() → void: Called by the ScrollActivityDelegate when it has changed type (for example, when changing from an Android-style scroll position to an iOS-style scroll position). If this activity can differ between the two modes, then it should tell the position to restart that activity appropriately. [...]
toString() → String: Returns a string representation of this object.
override
updateDelegate(ScrollActivityDelegate value) → void: Updates the activity's link to the ScrollActivityDelegate. [...]
noSuchMethod(Invocation invocation) → dynamic: Invoked when a non-existent method or property is accessed. [...]
inherited

Operators

operator ==(dynamic other) → bool: The equality operator. [...]
inherited