src/com/android/launcher3/allapps/FloatingHeaderView.java - LeafOS-Project/android_packages_apps_Launcher3 - Gitiles

 /*
  * Copyright (C) 2017 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 package com.android.launcher3.allapps;

 import android.animation.ValueAnimator;
 import android.content.Context;
 import android.graphics.Point;
 import android.graphics.Rect;
 import android.util.ArrayMap;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.LinearLayout;

 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.recyclerview.widget.RecyclerView;

 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.Insettable;
 import com.android.launcher3.R;
 import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.uioverrides.plugins.PluginManagerWrapper;
 import com.android.launcher3.views.ActivityContext;
 import com.android.systemui.plugins.AllAppsRow;
 import com.android.systemui.plugins.AllAppsRow.OnHeightUpdatedListener;
 import com.android.systemui.plugins.PluginListener;

 import java.util.ArrayList;
 import java.util.Map;

 public class FloatingHeaderView extends LinearLayout implements
         ValueAnimator.AnimatorUpdateListener, PluginListener<AllAppsRow>, Insettable,
         OnHeightUpdatedListener {

     private final Rect mRVClip = new Rect(0, 0, Integer.MAX_VALUE, Integer.MAX_VALUE);
     private final Rect mHeaderClip = new Rect(0, 0, Integer.MAX_VALUE, Integer.MAX_VALUE);
     private final ValueAnimator mAnimator = ValueAnimator.ofInt(0, 0);
     private final Point mTempOffset = new Point();
     private final RecyclerView.OnScrollListener mOnScrollListener =
             new RecyclerView.OnScrollListener() {
                 @Override
                 public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                 }

                 @Override
                 public void onScrolled(RecyclerView rv, int dx, int dy) {
                     if (rv != mCurrentRV) {
                         return;
                     }

                     if (mAnimator.isStarted()) {
                         mAnimator.cancel();
                     }

                     int current = -mCurrentRV.getCurrentScrollY();
                     boolean headerCollapsed = mHeaderCollapsed;
                     moved(current);
                     applyVerticalMove();
                     if (headerCollapsed != mHeaderCollapsed) {
                         BaseAllAppsContainerView<?> parent =
                                 (BaseAllAppsContainerView<?>) getParent();
                         parent.invalidateHeader();
                     }
                 }
             };

     protected final Map<AllAppsRow, PluginHeaderRow> mPluginRows = new ArrayMap<>();

     private final int mHeaderTopPadding;
     // These two values are necessary to ensure that the header protection is drawn correctly.
     private final int mHeaderTopAdjustment;
     private final int mHeaderBottomAdjustment;
     private final boolean mHeaderProtectionSupported;

     protected ViewGroup mTabLayout;
     private AllAppsRecyclerView mMainRV;
     private AllAppsRecyclerView mWorkRV;
     private AllAppsRecyclerView mCurrentRV;
     private ViewGroup mParent;
     public boolean mHeaderCollapsed;
     protected int mSnappedScrolledY;
     private int mTranslationY;

     private boolean mForwardToRecyclerView;

     protected boolean mTabsHidden;
     protected int mMaxTranslation;
     private boolean mMainRVActive = true;

     private boolean mCollapsed = false;

     // This is initialized once during inflation and stays constant after that. Fixed views
     // cannot be added or removed dynamically.
     private FloatingHeaderRow[] mFixedRows = FloatingHeaderRow.NO_ROWS;

     // Array of all fixed rows and plugin rows. This is initialized every time a plugin is
     // enabled or disabled, and represent the current set of all rows.
     private FloatingHeaderRow[] mAllRows = FloatingHeaderRow.NO_ROWS;


     public FloatingHeaderView(@NonNull Context context) {
         this(context, null);
     }

     public FloatingHeaderView(@NonNull Context context, @Nullable AttributeSet attrs) {
         super(context, attrs);
         mHeaderTopPadding = context.getResources()
                 .getDimensionPixelSize(R.dimen.all_apps_header_top_padding);
         mHeaderTopAdjustment = context.getResources()
                 .getDimensionPixelSize(R.dimen.all_apps_header_top_adjustment);
         mHeaderBottomAdjustment = context.getResources()
                 .getDimensionPixelSize(R.dimen.all_apps_header_bottom_adjustment);
         mHeaderProtectionSupported = context.getResources().getBoolean(
                 R.bool.config_header_protection_supported)
                 // TODO(b/208599118) Support header protection for bottom sheet.
                 && !ActivityContext.lookupContext(context).getDeviceProfile().isTablet;
     }

     @Override
     protected void onFinishInflate() {
         super.onFinishInflate();
         mTabLayout = findViewById(R.id.tabs);

         // Find all floating header rows.
         ArrayList<FloatingHeaderRow> rows = new ArrayList<>();
         int count = getChildCount();
         for (int i = 0; i < count; i++) {
             View child = getChildAt(i);
             if (child instanceof FloatingHeaderRow) {
                 rows.add((FloatingHeaderRow) child);
             }
         }
         mFixedRows = rows.toArray(new FloatingHeaderRow[rows.size()]);
         mAllRows = mFixedRows;
     }

     @Override
     protected void onAttachedToWindow() {
         super.onAttachedToWindow();
         PluginManagerWrapper.INSTANCE.get(getContext()).addPluginListener(this,
                 AllAppsRow.class, true /* allowMultiple */);
     }

     @Override
     protected void onDetachedFromWindow() {
         super.onDetachedFromWindow();
         PluginManagerWrapper.INSTANCE.get(getContext()).removePluginListener(this);
     }

     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         if (mMainRV != null) {
             mTabLayout.getLayoutParams().width = mMainRV.getTabWidth();
         }
         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     }

     private void recreateAllRowsArray() {
         int pluginCount = mPluginRows.size();
         if (pluginCount == 0) {
             mAllRows = mFixedRows;
         } else {
             int count = mFixedRows.length;
             mAllRows = new FloatingHeaderRow[count + pluginCount];
             for (int i = 0; i < count; i++) {
                 mAllRows[i] = mFixedRows[i];
             }

             for (PluginHeaderRow row : mPluginRows.values()) {
                 mAllRows[count] = row;
                 count++;
             }
         }
     }

     @Override
     public void onPluginConnected(AllAppsRow allAppsRowPlugin, Context context) {
         PluginHeaderRow headerRow = new PluginHeaderRow(allAppsRowPlugin, this);
         addView(headerRow.mView, indexOfChild(mTabLayout));
         mPluginRows.put(allAppsRowPlugin, headerRow);
         recreateAllRowsArray();
         allAppsRowPlugin.setOnHeightUpdatedListener(this);
     }

     @Override
     public void onHeightUpdated() {
         int oldMaxHeight = mMaxTranslation;
         updateExpectedHeight();

         if (mMaxTranslation != oldMaxHeight) {
             BaseAllAppsContainerView<?> parent = (BaseAllAppsContainerView<?>) getParent();
             if (parent != null) {
                 parent.setupHeader();
             }
         }
     }

     @Override
     public void onPluginDisconnected(AllAppsRow plugin) {
         PluginHeaderRow row = mPluginRows.get(plugin);
         removeView(row.mView);
         mPluginRows.remove(plugin);
         recreateAllRowsArray();
         onHeightUpdated();
     }

     @Override
     public View getFocusedChild() {
         if (FeatureFlags.ENABLE_DEVICE_SEARCH.get()) {
             for (FloatingHeaderRow row : mAllRows) {
                 if (row.hasVisibleContent() && row.isVisible()) {
                     return row.getFocusedChild();
                 }
             }
             return null;
         }
         return super.getFocusedChild();
     }

     void setup(AllAppsRecyclerView mainRV, AllAppsRecyclerView workRV, boolean tabsHidden) {
         for (FloatingHeaderRow row : mAllRows) {
             row.setup(this, mAllRows, tabsHidden);
         }
         updateExpectedHeight();

         mTabsHidden = tabsHidden;
         mTabLayout.setVisibility(tabsHidden ? View.GONE : View.VISIBLE);
         mMainRV = setupRV(mMainRV, mainRV);
         mWorkRV = setupRV(mWorkRV, workRV);
         mParent = (ViewGroup) mMainRV.getParent();
         setMainActive(mMainRVActive || mWorkRV == null);
         reset(false);
     }

     private AllAppsRecyclerView setupRV(AllAppsRecyclerView old, AllAppsRecyclerView updated) {
         if (old != updated && updated != null) {
             updated.addOnScrollListener(mOnScrollListener);
         }
         return updated;
     }

     private void updateExpectedHeight() {
         mMaxTranslation = 0;
         if (mCollapsed) {
             return;
         }
         for (FloatingHeaderRow row : mAllRows) {
             mMaxTranslation += row.getExpectedHeight();
         }
         if (!mTabsHidden) {
             mMaxTranslation += mHeaderBottomAdjustment;
         }
     }

     public void setMainActive(boolean active) {
         mCurrentRV = active ? mMainRV : mWorkRV;
         mMainRVActive = active;
     }

     public int getMaxTranslation() {
         if (mMaxTranslation == 0 && mTabsHidden) {
             return getResources().getDimensionPixelSize(R.dimen.all_apps_search_bar_bottom_padding);
         } else if (mMaxTranslation > 0 && mTabsHidden) {
             return mMaxTranslation + getPaddingTop();
         } else {
             return mMaxTranslation;
         }
     }

     private boolean canSnapAt(int currentScrollY) {
         return Math.abs(currentScrollY) <= mMaxTranslation;
     }

     private void moved(final int currentScrollY) {
         if (mHeaderCollapsed) {
             if (currentScrollY <= mSnappedScrolledY) {
                 if (canSnapAt(currentScrollY)) {
                     mSnappedScrolledY = currentScrollY;
                 }
             } else {
                 mHeaderCollapsed = false;
             }
             mTranslationY = currentScrollY;
         } else {
             mTranslationY = currentScrollY - mSnappedScrolledY - mMaxTranslation;

             // update state vars
             if (mTranslationY >= 0) { // expanded: must not move down further
                 mTranslationY = 0;
                 mSnappedScrolledY = currentScrollY - mMaxTranslation;
             } else if (mTranslationY <= -mMaxTranslation) { // hide or stay hidden
                 mHeaderCollapsed = true;
                 mSnappedScrolledY = -mMaxTranslation;
             }
         }
     }

     protected void applyVerticalMove() {
         int uncappedTranslationY = mTranslationY;
         mTranslationY = Math.max(mTranslationY, -mMaxTranslation);

         if (mCollapsed || uncappedTranslationY < mTranslationY - mHeaderTopPadding) {
             // we hide it completely if already capped (for opening search anim)
             for (FloatingHeaderRow row : mAllRows) {
                 row.setVerticalScroll(0, true /* isScrolledOut */);
             }
         } else {
             for (FloatingHeaderRow row : mAllRows) {
                 row.setVerticalScroll(uncappedTranslationY, false /* isScrolledOut */);
             }
         }

         mTabLayout.setTranslationY(mTranslationY);

         int clipTop = mHeaderTopPadding - mHeaderTopAdjustment;
         mRVClip.top = mTabsHidden ? clipTop : 0;
         mHeaderClip.top = clipTop;
         // clipping on a draw might cause additional redraw
         setClipBounds(mHeaderClip);
         mMainRV.setClipBounds(mRVClip);
         if (mWorkRV != null) {
             mWorkRV.setClipBounds(mRVClip);
         }
     }

     /**
      * Hides all the floating rows
      */
     public void setCollapsed(boolean collapse) {
         if (mCollapsed == collapse) return;

         mCollapsed = collapse;
         onHeightUpdated();
     }

     public void reset(boolean animate) {
         if (mAnimator.isStarted()) {
             mAnimator.cancel();
         }
         if (animate) {
             mAnimator.setIntValues(mTranslationY, 0);
             mAnimator.addUpdateListener(this);
             mAnimator.setDuration(150);
             mAnimator.start();
         } else {
             mTranslationY = 0;
             applyVerticalMove();
         }
         mHeaderCollapsed = false;
         mSnappedScrolledY = -mMaxTranslation;
         mCurrentRV.scrollToTop();
     }

     public boolean isExpanded() {
         return !mHeaderCollapsed;
     }

     @Override
     public void onAnimationUpdate(ValueAnimator animation) {
         mTranslationY = (Integer) animation.getAnimatedValue();
         applyVerticalMove();
     }

     @Override
     public boolean onInterceptTouchEvent(MotionEvent ev) {
         calcOffset(mTempOffset);
         ev.offsetLocation(mTempOffset.x, mTempOffset.y);
         mForwardToRecyclerView = mCurrentRV.onInterceptTouchEvent(ev);
         ev.offsetLocation(-mTempOffset.x, -mTempOffset.y);
         return mForwardToRecyclerView || super.onInterceptTouchEvent(ev);
     }

     @Override
     public boolean onTouchEvent(MotionEvent event) {
         if (mForwardToRecyclerView) {
             // take this view's and parent view's (view pager) location into account
             calcOffset(mTempOffset);
             event.offsetLocation(mTempOffset.x, mTempOffset.y);
             try {
                 return mCurrentRV.onTouchEvent(event);
             } finally {
                 event.offsetLocation(-mTempOffset.x, -mTempOffset.y);
             }
         } else {
             return super.onTouchEvent(event);
         }
     }

     private void calcOffset(Point p) {
         p.x = getLeft() - mCurrentRV.getLeft() - mParent.getLeft();
         p.y = getTop() - mCurrentRV.getTop() - mParent.getTop();
     }

     public boolean hasVisibleContent() {
         for (FloatingHeaderRow row : mAllRows) {
             if (row.hasVisibleContent()) {
                 return true;
             }
         }
         return false;
     }

     public boolean isHeaderProtectionSupported() {
         return mHeaderProtectionSupported;
     }

     @Override
     public boolean hasOverlappingRendering() {
         return false;
     }

     @Override
     public void setInsets(Rect insets) {
         DeviceProfile grid = ActivityContext.lookupContext(getContext()).getDeviceProfile();
         for (FloatingHeaderRow row : mAllRows) {
             row.setInsets(insets, grid);
         }
     }

     public <T extends FloatingHeaderRow> T findFixedRowByType(Class<T> type) {
         for (FloatingHeaderRow row : mAllRows) {
             if (row.getTypeClass() == type) {
                 return (T) row;
             }
         }
         return null;
     }

     /**
      * Returns visible height of FloatingHeaderView contents requiring header protection
      */
     public int getPeripheralProtectionHeight() {
         if (!mHeaderProtectionSupported) {
             return 0;
         }

         // we only want to show protection when work tab is available and header is either
         // collapsed or animating to/from collapsed state
         if (mTabsHidden || !mHeaderCollapsed) {
             return 0;
         }
         return Math.max(getHeight() - getPaddingTop() + mTranslationY, 0);
     }
 }
	/*
	* Copyright (C) 2017 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	package com.android.launcher3.allapps;

	import android.animation.ValueAnimator;
	import android.content.Context;
	import android.graphics.Point;
	import android.graphics.Rect;
	import android.util.ArrayMap;
	import android.util.AttributeSet;
	import android.view.MotionEvent;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.LinearLayout;

	import androidx.annotation.NonNull;
	import androidx.annotation.Nullable;
	import androidx.recyclerview.widget.RecyclerView;

	import com.android.launcher3.DeviceProfile;
	import com.android.launcher3.Insettable;
	import com.android.launcher3.R;
	import com.android.launcher3.config.FeatureFlags;
	import com.android.launcher3.uioverrides.plugins.PluginManagerWrapper;
	import com.android.launcher3.views.ActivityContext;
	import com.android.systemui.plugins.AllAppsRow;
	import com.android.systemui.plugins.AllAppsRow.OnHeightUpdatedListener;
	import com.android.systemui.plugins.PluginListener;

	import java.util.ArrayList;
	import java.util.Map;

	public class FloatingHeaderView extends LinearLayout implements
	ValueAnimator.AnimatorUpdateListener, PluginListener<AllAppsRow>, Insettable,
	OnHeightUpdatedListener {

	private final Rect mRVClip = new Rect(0, 0, Integer.MAX_VALUE, Integer.MAX_VALUE);
	private final Rect mHeaderClip = new Rect(0, 0, Integer.MAX_VALUE, Integer.MAX_VALUE);
	private final ValueAnimator mAnimator = ValueAnimator.ofInt(0, 0);
	private final Point mTempOffset = new Point();
	private final RecyclerView.OnScrollListener mOnScrollListener =
	new RecyclerView.OnScrollListener() {
	@Override
	public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
	}

	@Override
	public void onScrolled(RecyclerView rv, int dx, int dy) {
	if (rv != mCurrentRV) {
	return;
	}

	if (mAnimator.isStarted()) {
	mAnimator.cancel();
	}

	int current = -mCurrentRV.getCurrentScrollY();
	boolean headerCollapsed = mHeaderCollapsed;
	moved(current);
	applyVerticalMove();
	if (headerCollapsed != mHeaderCollapsed) {
	BaseAllAppsContainerView<?> parent =
	(BaseAllAppsContainerView<?>) getParent();
	parent.invalidateHeader();
	}
	}
	};

	protected final Map<AllAppsRow, PluginHeaderRow> mPluginRows = new ArrayMap<>();

	private final int mHeaderTopPadding;
	// These two values are necessary to ensure that the header protection is drawn correctly.
	private final int mHeaderTopAdjustment;
	private final int mHeaderBottomAdjustment;
	private final boolean mHeaderProtectionSupported;

	protected ViewGroup mTabLayout;
	private AllAppsRecyclerView mMainRV;
	private AllAppsRecyclerView mWorkRV;
	private AllAppsRecyclerView mCurrentRV;
	private ViewGroup mParent;
	public boolean mHeaderCollapsed;
	protected int mSnappedScrolledY;
	private int mTranslationY;

	private boolean mForwardToRecyclerView;

	protected boolean mTabsHidden;
	protected int mMaxTranslation;
	private boolean mMainRVActive = true;

	private boolean mCollapsed = false;

	// This is initialized once during inflation and stays constant after that. Fixed views
	// cannot be added or removed dynamically.
	private FloatingHeaderRow[] mFixedRows = FloatingHeaderRow.NO_ROWS;

	// Array of all fixed rows and plugin rows. This is initialized every time a plugin is
	// enabled or disabled, and represent the current set of all rows.
	private FloatingHeaderRow[] mAllRows = FloatingHeaderRow.NO_ROWS;


	public FloatingHeaderView(@NonNull Context context) {
	this(context, null);
	}

	public FloatingHeaderView(@NonNull Context context, @Nullable AttributeSet attrs) {
	super(context, attrs);
	mHeaderTopPadding = context.getResources()
	.getDimensionPixelSize(R.dimen.all_apps_header_top_padding);
	mHeaderTopAdjustment = context.getResources()
	.getDimensionPixelSize(R.dimen.all_apps_header_top_adjustment);
	mHeaderBottomAdjustment = context.getResources()
	.getDimensionPixelSize(R.dimen.all_apps_header_bottom_adjustment);
	mHeaderProtectionSupported = context.getResources().getBoolean(
	R.bool.config_header_protection_supported)
	// TODO(b/208599118) Support header protection for bottom sheet.
	&& !ActivityContext.lookupContext(context).getDeviceProfile().isTablet;
	}

	@Override
	protected void onFinishInflate() {
	super.onFinishInflate();
	mTabLayout = findViewById(R.id.tabs);

	// Find all floating header rows.
	ArrayList<FloatingHeaderRow> rows = new ArrayList<>();
	int count = getChildCount();
	for (int i = 0; i < count; i++) {
	View child = getChildAt(i);
	if (child instanceof FloatingHeaderRow) {
	rows.add((FloatingHeaderRow) child);
	}
	}
	mFixedRows = rows.toArray(new FloatingHeaderRow[rows.size()]);
	mAllRows = mFixedRows;
	}

	@Override
	protected void onAttachedToWindow() {
	super.onAttachedToWindow();
	PluginManagerWrapper.INSTANCE.get(getContext()).addPluginListener(this,
	AllAppsRow.class, true /* allowMultiple */);
	}

	@Override
	protected void onDetachedFromWindow() {
	super.onDetachedFromWindow();
	PluginManagerWrapper.INSTANCE.get(getContext()).removePluginListener(this);
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
	if (mMainRV != null) {
	mTabLayout.getLayoutParams().width = mMainRV.getTabWidth();
	}
	super.onMeasure(widthMeasureSpec, heightMeasureSpec);
	}

	private void recreateAllRowsArray() {
	int pluginCount = mPluginRows.size();
	if (pluginCount == 0) {
	mAllRows = mFixedRows;
	} else {
	int count = mFixedRows.length;
	mAllRows = new FloatingHeaderRow[count + pluginCount];
	for (int i = 0; i < count; i++) {
	mAllRows[i] = mFixedRows[i];
	}

	for (PluginHeaderRow row : mPluginRows.values()) {
	mAllRows[count] = row;
	count++;
	}
	}
	}

	@Override
	public void onPluginConnected(AllAppsRow allAppsRowPlugin, Context context) {
	PluginHeaderRow headerRow = new PluginHeaderRow(allAppsRowPlugin, this);
	addView(headerRow.mView, indexOfChild(mTabLayout));
	mPluginRows.put(allAppsRowPlugin, headerRow);
	recreateAllRowsArray();
	allAppsRowPlugin.setOnHeightUpdatedListener(this);
	}

	@Override
	public void onHeightUpdated() {
	int oldMaxHeight = mMaxTranslation;
	updateExpectedHeight();

	if (mMaxTranslation != oldMaxHeight) {
	BaseAllAppsContainerView<?> parent = (BaseAllAppsContainerView<?>) getParent();
	if (parent != null) {
	parent.setupHeader();
	}
	}
	}

	@Override
	public void onPluginDisconnected(AllAppsRow plugin) {
	PluginHeaderRow row = mPluginRows.get(plugin);
	removeView(row.mView);
	mPluginRows.remove(plugin);
	recreateAllRowsArray();
	onHeightUpdated();
	}

	@Override
	public View getFocusedChild() {
	if (FeatureFlags.ENABLE_DEVICE_SEARCH.get()) {
	for (FloatingHeaderRow row : mAllRows) {
	if (row.hasVisibleContent() && row.isVisible()) {
	return row.getFocusedChild();
	}
	}
	return null;
	}
	return super.getFocusedChild();
	}

	void setup(AllAppsRecyclerView mainRV, AllAppsRecyclerView workRV, boolean tabsHidden) {
	for (FloatingHeaderRow row : mAllRows) {
	row.setup(this, mAllRows, tabsHidden);
	}
	updateExpectedHeight();

	mTabsHidden = tabsHidden;
	mTabLayout.setVisibility(tabsHidden ? View.GONE : View.VISIBLE);
	mMainRV = setupRV(mMainRV, mainRV);
	mWorkRV = setupRV(mWorkRV, workRV);
	mParent = (ViewGroup) mMainRV.getParent();
	setMainActive(mMainRVActive \|\| mWorkRV == null);
	reset(false);
	}

	private AllAppsRecyclerView setupRV(AllAppsRecyclerView old, AllAppsRecyclerView updated) {
	if (old != updated && updated != null) {
	updated.addOnScrollListener(mOnScrollListener);
	}
	return updated;
	}

	private void updateExpectedHeight() {
	mMaxTranslation = 0;
	if (mCollapsed) {
	return;
	}
	for (FloatingHeaderRow row : mAllRows) {
	mMaxTranslation += row.getExpectedHeight();
	}
	if (!mTabsHidden) {
	mMaxTranslation += mHeaderBottomAdjustment;
	}
	}

	public void setMainActive(boolean active) {
	mCurrentRV = active ? mMainRV : mWorkRV;
	mMainRVActive = active;
	}

	public int getMaxTranslation() {
	if (mMaxTranslation == 0 && mTabsHidden) {
	return getResources().getDimensionPixelSize(R.dimen.all_apps_search_bar_bottom_padding);
	} else if (mMaxTranslation > 0 && mTabsHidden) {
	return mMaxTranslation + getPaddingTop();
	} else {
	return mMaxTranslation;
	}
	}

	private boolean canSnapAt(int currentScrollY) {
	return Math.abs(currentScrollY) <= mMaxTranslation;
	}

	private void moved(final int currentScrollY) {
	if (mHeaderCollapsed) {
	if (currentScrollY <= mSnappedScrolledY) {
	if (canSnapAt(currentScrollY)) {
	mSnappedScrolledY = currentScrollY;
	}
	} else {
	mHeaderCollapsed = false;
	}
	mTranslationY = currentScrollY;
	} else {
	mTranslationY = currentScrollY - mSnappedScrolledY - mMaxTranslation;

	// update state vars
	if (mTranslationY >= 0) { // expanded: must not move down further
	mTranslationY = 0;
	mSnappedScrolledY = currentScrollY - mMaxTranslation;
	} else if (mTranslationY <= -mMaxTranslation) { // hide or stay hidden
	mHeaderCollapsed = true;
	mSnappedScrolledY = -mMaxTranslation;
	}
	}
	}

	protected void applyVerticalMove() {
	int uncappedTranslationY = mTranslationY;
	mTranslationY = Math.max(mTranslationY, -mMaxTranslation);

	if (mCollapsed \|\| uncappedTranslationY < mTranslationY - mHeaderTopPadding) {
	// we hide it completely if already capped (for opening search anim)
	for (FloatingHeaderRow row : mAllRows) {
	row.setVerticalScroll(0, true /* isScrolledOut */);
	}
	} else {
	for (FloatingHeaderRow row : mAllRows) {
	row.setVerticalScroll(uncappedTranslationY, false /* isScrolledOut */);
	}
	}

	mTabLayout.setTranslationY(mTranslationY);

	int clipTop = mHeaderTopPadding - mHeaderTopAdjustment;
	mRVClip.top = mTabsHidden ? clipTop : 0;
	mHeaderClip.top = clipTop;
	// clipping on a draw might cause additional redraw
	setClipBounds(mHeaderClip);
	mMainRV.setClipBounds(mRVClip);
	if (mWorkRV != null) {
	mWorkRV.setClipBounds(mRVClip);
	}
	}

	/**
	* Hides all the floating rows
	*/
	public void setCollapsed(boolean collapse) {
	if (mCollapsed == collapse) return;

	mCollapsed = collapse;
	onHeightUpdated();
	}

	public void reset(boolean animate) {
	if (mAnimator.isStarted()) {
	mAnimator.cancel();
	}
	if (animate) {
	mAnimator.setIntValues(mTranslationY, 0);
	mAnimator.addUpdateListener(this);
	mAnimator.setDuration(150);
	mAnimator.start();
	} else {
	mTranslationY = 0;
	applyVerticalMove();
	}
	mHeaderCollapsed = false;
	mSnappedScrolledY = -mMaxTranslation;
	mCurrentRV.scrollToTop();
	}

	public boolean isExpanded() {
	return !mHeaderCollapsed;
	}

	@Override
	public void onAnimationUpdate(ValueAnimator animation) {
	mTranslationY = (Integer) animation.getAnimatedValue();
	applyVerticalMove();
	}

	@Override
	public boolean onInterceptTouchEvent(MotionEvent ev) {
	calcOffset(mTempOffset);
	ev.offsetLocation(mTempOffset.x, mTempOffset.y);
	mForwardToRecyclerView = mCurrentRV.onInterceptTouchEvent(ev);
	ev.offsetLocation(-mTempOffset.x, -mTempOffset.y);
	return mForwardToRecyclerView \|\| super.onInterceptTouchEvent(ev);
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
	if (mForwardToRecyclerView) {
	// take this view's and parent view's (view pager) location into account
	calcOffset(mTempOffset);
	event.offsetLocation(mTempOffset.x, mTempOffset.y);
	try {
	return mCurrentRV.onTouchEvent(event);
	} finally {
	event.offsetLocation(-mTempOffset.x, -mTempOffset.y);
	}
	} else {
	return super.onTouchEvent(event);
	}
	}

	private void calcOffset(Point p) {
	p.x = getLeft() - mCurrentRV.getLeft() - mParent.getLeft();
	p.y = getTop() - mCurrentRV.getTop() - mParent.getTop();
	}

	public boolean hasVisibleContent() {
	for (FloatingHeaderRow row : mAllRows) {
	if (row.hasVisibleContent()) {
	return true;
	}
	}
	return false;
	}

	public boolean isHeaderProtectionSupported() {
	return mHeaderProtectionSupported;
	}

	@Override
	public boolean hasOverlappingRendering() {
	return false;
	}

	@Override
	public void setInsets(Rect insets) {
	DeviceProfile grid = ActivityContext.lookupContext(getContext()).getDeviceProfile();
	for (FloatingHeaderRow row : mAllRows) {
	row.setInsets(insets, grid);
	}
	}

	public <T extends FloatingHeaderRow> T findFixedRowByType(Class<T> type) {
	for (FloatingHeaderRow row : mAllRows) {
	if (row.getTypeClass() == type) {
	return (T) row;
	}
	}
	return null;
	}

	/**
	* Returns visible height of FloatingHeaderView contents requiring header protection
	*/
	public int getPeripheralProtectionHeight() {
	if (!mHeaderProtectionSupported) {
	return 0;
	}

	// we only want to show protection when work tab is available and header is either
	// collapsed or animating to/from collapsed state
	if (mTabsHidden \|\| !mHeaderCollapsed) {
	return 0;
	}
	return Math.max(getHeight() - getPaddingTop() + mTranslationY, 0);
	}
	}