Merge "Add slow fade-in to notification shelf icon to prevent overlapping...

import android.view.ViewGroup;

import android.view.ViewTreeObserver;

import android.view.accessibility.AccessibilityNodeInfo;

import android.view.animation.Interpolator;

import android.view.animation.PathInterpolator;

import com.android.internal.annotations.VisibleForTesting;

import com.android.systemui.R;

    private static final int TAG_CONTINUOUS_CLIPPING = R.id.continuous_clipping_tag;

    private static final String TAG = "NotificationShelf";

    // More extreme version of SLOW_OUT_LINEAR_IN which keeps the icon nearly invisible until after

    // the next icon has translated out of the way, to avoid overlapping.

    private static final Interpolator ICON_ALPHA_INTERPOLATOR =

            new PathInterpolator(0.6f, 0f, 0.6f, 0f);

    private NotificationIconContainer mShelfIcons;

    private int[] mTmp = new int[2];

    private boolean mHideBackground;

        if (iconState == null) {

            return;

        }

        iconState.alpha = transitionAmount;

        iconState.alpha = ICON_ALPHA_INTERPOLATOR.getInterpolation(transitionAmount);

        boolean isAppearing = row.isDrawingAppearAnimation() && !row.isInShelf();

        iconState.hidden = isAppearing

                || (view instanceof ExpandableNotificationRow