belongs to Maven artifact com.android.support:support-compat:28.0.0-alpha1
NestedScrollingChild
public
interface
NestedScrollingChild
| android.support.v4.view.NestedScrollingChild |
Known Indirect Subclasses
|
This interface should be implemented by View subclasses that wish
to support dispatching nested scrolling operations to a cooperating parent
ViewGroup.
Classes implementing this interface should create a final instance of a
NestedScrollingChildHelper as a field and delegate any View methods to the
NestedScrollingChildHelper methods of the same signature.
Views invoking nested scrolling functionality should always do so from the relevant
ViewCompat, ViewGroupCompat or ViewParentCompat compatibility
shim static methods. This ensures interoperability with nested scrolling views on Android
5.0 Lollipop and newer.
Summary
Public methods | |
|---|---|
abstract
boolean
|
dispatchNestedFling(float velocityX, float velocityY, boolean consumed)
Dispatch a fling to a nested scrolling parent. |
abstract
boolean
|
dispatchNestedPreFling(float velocityX, float velocityY)
Dispatch a fling to a nested scrolling parent before it is processed by this view. |
abstract
boolean
|
dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow)
Dispatch one step of a nested scroll in progress before this view consumes any portion of it. |
abstract
boolean
|
dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int[] offsetInWindow)
Dispatch one step of a nested scroll in progress. |
abstract
boolean
|
hasNestedScrollingParent()
Returns true if this view has a nested scrolling parent. |
abstract
boolean
|
isNestedScrollingEnabled()
Returns true if nested scrolling is enabled for this view. |
abstract
void
|
setNestedScrollingEnabled(boolean enabled)
Enable or disable nested scrolling for this view. |
abstract
boolean
|
startNestedScroll(int axes)
Begin a nestable scroll operation along the given axes. |
abstract
void
|
stopNestedScroll()
Stop a nested scroll in progress. |
Public methods
dispatchNestedFling
boolean dispatchNestedFling (float velocityX,
float velocityY,
boolean consumed)
Dispatch a fling to a nested scrolling parent.
This method should be used to indicate that a nested scrolling child has detected
suitable conditions for a fling. Generally this means that a touch scroll has ended with a
velocity in the direction of scrolling that meets or exceeds
the minimum fling velocity
along a scrollable axis.
If a nested scrolling child view would normally fling but it is at the edge of its own content, it can use this method to delegate the fling to its nested scrolling parent instead. The parent may optionally consume the fling or observe a child fling.
| Parameters |
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