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[HideViewOnScrollBehavior] Add a method to get the HideViewOnScrollBehavior associated with the view #4768

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[HideViewOnScrollBehavior] Add a method to get the HideViewOnScrollBehavior associated with the view #4768

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20 changes: 20 additions & 0 deletions lib/java/com/google/android/material/behavior/HideViewOnScrollBehavior.java
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Original file line number Diff line number Diff line change
Expand Up @@ -421,4 +421,24 @@ public void disableOnTouchExploration(boolean disableOnTouchExploration) {
public boolean isDisabledOnTouchExploration() {
return disableOnTouchExploration;
}

/**
* A utility function to get the {@link HideViewOnScrollBehavior} associated with the {@code view}.
*
* @param view The {@link View} with {@link HideViewOnScrollBehavior}.
* @return The {@link HideViewOnScrollBehavior} associated with the {@code view}.
*/
@NonNull
@SuppressWarnings("unchecked")
public static <V extends View> HideViewOnScrollBehavior<V> from(@NonNull V view) {
ViewGroup.LayoutParams params = view.getLayoutParams();
if (!(params instanceof LayoutParams)) {
throw new IllegalArgumentException("The view is not a child of CoordinatorLayout");
}
CoordinatorLayout.Behavior<?> behavior = ((LayoutParams) params).getBehavior();
if (!(behavior instanceof HideViewOnScrollBehavior)) {
throw new IllegalArgumentException("The view is not associated with HideViewOnScrollBehavior");
}
return (HideViewOnScrollBehavior<V>) behavior;
}
}