Summary: Ctors | Methods | Inherited Methods

InterpolateOnScrollPositionChangeHelper

public class InterpolateOnScrollPositionChangeHelper
extends Object

java.lang.Object
↳	com.google.android.material.shape.InterpolateOnScrollPositionChangeHelper

Helper class to handle shape interpolation when shaped views enter or exit the window.

Summary

Public constructors
`InterpolateOnScrollPositionChangeHelper(View shapedView, MaterialShapeDrawable materialShapeDrawable, ScrollView containingScrollView)` Instantiate a scroll position helper.

Public methods
`void`	`setContainingScrollView(ScrollView containingScrollView)` Set the `ScrollView` which contains the `View` being interpolated.
`void`	`setMaterialShapeDrawable(MaterialShapeDrawable materialShapeDrawable)` Set the `MaterialShapeDrawable` which will be interpolated.
`void`	`startListeningForScrollChanges(ViewTreeObserver viewTreeObserver)` Start listening for scroll changes and interpolating based on position.
`void`	`stopListeningForScrollChanges(ViewTreeObserver viewTreeObserver)` Stop listening for scroll changes and interpolating based on position.
`void`	`updateInterpolationForScreenPosition()` Updates the `MaterialShapeDrawable`'s interpolation based on the `View`'s position in the containing `ScrollView`.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()`
`boolean`	`equals(Object arg0)`
`void`	`finalize()`
`final Class<?>`	`getClass()`
`int`	`hashCode()`
`final void`	`notify()`
`final void`	`notifyAll()`
`String`	`toString()`
`final void`	`wait(long arg0, int arg1)`
`final void`	`wait(long arg0)`
`final void`	`wait()`

Public constructors

public InterpolateOnScrollPositionChangeHelper (View shapedView, 
                MaterialShapeDrawable materialShapeDrawable, 
                ScrollView containingScrollView)

Instantiate a scroll position helper.

Parameters
`shapedView`	`View`: the `View` whose background is a `MaterialShapeDrawable` and which is scrolled in and out of view.
`materialShapeDrawable`	`MaterialShapeDrawable`: the `MaterialShapeDrawable` which will be interpolated.
`containingScrollView`	`ScrollView`: the `ScrollView` that contains shapedView.

Public methods

public void setContainingScrollView (ScrollView containingScrollView)

Set the ScrollView which contains the View being interpolated.

setMaterialShapeDrawable

public void setMaterialShapeDrawable (MaterialShapeDrawable materialShapeDrawable)

Set the MaterialShapeDrawable which will be interpolated.

Parameters
`materialShapeDrawable`	`MaterialShapeDrawable`: the desired drawable.

startListeningForScrollChanges

public void startListeningForScrollChanges (ViewTreeObserver viewTreeObserver)

Start listening for scroll changes and interpolating based on position.

Parameters
`viewTreeObserver`	`ViewTreeObserver`: {@link ViewTreeObserver belonging to the {@link View} being interpolated.

stopListeningForScrollChanges

public void stopListeningForScrollChanges (ViewTreeObserver viewTreeObserver)

Stop listening for scroll changes and interpolating based on position.

Parameters
`viewTreeObserver`	`ViewTreeObserver`: {@link ViewTreeObserver belonging to the {@link View} being interpolated.

updateInterpolationForScreenPosition

public void updateInterpolationForScreenPosition ()

Updates the MaterialShapeDrawable's interpolation based on the View's position in the containing ScrollView.