IScrollCaptureCallback Interface

Definition

[Android.Runtime.Register("android/view/ScrollCaptureCallback", "", "Android.Views.IScrollCaptureCallbackInvoker", ApiSince=31)]
public interface IScrollCaptureCallback : Android.Runtime.IJavaObject, IDisposable, Java.Interop.IJavaPeerable

[<Android.Runtime.Register("android/view/ScrollCaptureCallback", "", "Android.Views.IScrollCaptureCallbackInvoker", ApiSince=31)>]
type IScrollCaptureCallback = interface
    interface IJavaObject
    interface IDisposable
    interface IJavaPeerable

Attributes

RegisterAttribute

Implements

IJavaObject IJavaPeerable IDisposable

Remarks

A ScrollCaptureCallback is responsible for providing rendered snapshots of scrolling content for the scroll capture system. A single callback is responsible for providing support to a single scrolling UI element. At request time, the system will select the best candidate from among all callbacks registered within the window.

A callback is assigned to a View using View#setScrollCaptureCallback, or to the window as Window#registerScrollCaptureCallback. The point where the callback is registered defines the frame of reference for the bounds measurements used.

<b>Terminology</b> <dl> <dt>Containing View</dt> <dd>The view on which this callback is attached, or the root view of the window if the callback is assigned directly to a window.</dd>

<dt>Scroll Bounds</dt> <dd>A rectangle which describes an area within the containing view where scrolling content appears. This may be the entire view or any rectangle within. This defines a frame of reference for requests as well as the width and maximum height of a single request.</dd>

<dt>Scroll Delta</dt> <dd>The distance the scroll position has moved since capture started. Implementations are responsible for tracking changes in vertical scroll position during capture. This is required to map the capture area to the correct location, given the current scroll position.

<dt>Capture Area</dt> <dd>A rectangle which describes the area to capture, relative to scroll bounds. The vertical position remains relative to the starting scroll position and any movement since ("Scroll Delta") should be subtracted to locate the correct local position, and scrolled into view as necessary. </dd> </dl>

Java documentation for android.view.ScrollCaptureCallback.

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

Properties

Methods

Extension Methods

Applies to