src/com/android/documentsui/NavigationViewManager.java - LeafOS-Project/android_packages_apps_DocumentsUI - Gitiles

 /*
  * Copyright (C) 2016 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.documentsui;

 import static com.android.documentsui.base.SharedMinimal.VERBOSE;

 import android.content.res.Resources;
 import android.content.res.TypedArray;
 import android.graphics.Outline;
 import android.graphics.drawable.ColorDrawable;
 import android.graphics.drawable.Drawable;
 import android.util.Log;
 import android.view.View;
 import android.view.ViewOutlineProvider;
 import android.view.Window;
 import android.view.WindowManager;
 import android.widget.FrameLayout;

 import androidx.annotation.ColorRes;
 import androidx.annotation.Nullable;
 import androidx.appcompat.widget.Toolbar;
 import androidx.core.content.ContextCompat;

 import com.android.documentsui.base.RootInfo;
 import com.android.documentsui.base.State;
 import com.android.documentsui.base.UserId;
 import com.android.documentsui.dirlist.AnimationView;
 import com.android.documentsui.util.VersionUtils;
 import com.android.modules.utils.build.SdkLevel;

 import com.google.android.material.appbar.AppBarLayout;
 import com.google.android.material.appbar.CollapsingToolbarLayout;

 import java.util.function.IntConsumer;

 /**
  * A facade over the portions of the app and drawer toolbars.
  */
 public class NavigationViewManager implements AppBarLayout.OnOffsetChangedListener {

     private static final String TAG = "NavigationViewManager";

     private final DrawerController mDrawer;
     private final Toolbar mToolbar;
     private final BaseActivity mActivity;
     private final View mHeader;
     private final State mState;
     private final NavigationViewManager.Environment mEnv;
     private final Breadcrumb mBreadcrumb;
     private final ProfileTabs mProfileTabs;
     private final View mSearchBarView;
     private final CollapsingToolbarLayout mCollapsingBarLayout;
     private final Drawable mDefaultActionBarBackground;
     private final ViewOutlineProvider mDefaultOutlineProvider;
     private final ViewOutlineProvider mSearchBarOutlineProvider;
     private final boolean mShowSearchBar;
     private final ConfigStore mConfigStore;

     private boolean mIsActionModeActivated = false;
     @ColorRes
     private int mDefaultStatusBarColorResId;

     public NavigationViewManager(
             BaseActivity activity,
             DrawerController drawer,
             State state,
             NavigationViewManager.Environment env,
             Breadcrumb breadcrumb,
             View tabLayoutContainer,
             UserIdManager userIdManager,
             ConfigStore configStore) {
         this(activity, drawer, state, env, breadcrumb, tabLayoutContainer, userIdManager, null,
                 configStore);
     }

     public NavigationViewManager(
             BaseActivity activity,
             DrawerController drawer,
             State state,
             NavigationViewManager.Environment env,
             Breadcrumb breadcrumb,
             View tabLayoutContainer,
             UserManagerState userManagerState,
             ConfigStore configStore) {
         this(activity, drawer, state, env, breadcrumb, tabLayoutContainer, null, userManagerState,
                 configStore);
     }

     public NavigationViewManager(
             BaseActivity activity,
             DrawerController drawer,
             State state,
             NavigationViewManager.Environment env,
             Breadcrumb breadcrumb,
             View tabLayoutContainer,
             UserIdManager userIdManager,
             UserManagerState userManagerState,
             ConfigStore configStore) {

         mActivity = activity;
         mToolbar = activity.findViewById(R.id.toolbar);
         mHeader = activity.findViewById(R.id.directory_header);
         mDrawer = drawer;
         mState = state;
         mEnv = env;
         mBreadcrumb = breadcrumb;
         mBreadcrumb.setup(env, state, this::onNavigationItemSelected);
         mConfigStore = configStore;
         mProfileTabs =
                 getProfileTabs(tabLayoutContainer, userIdManager, userManagerState, activity);

         mToolbar.setNavigationOnClickListener(
                 new View.OnClickListener() {
                     @Override
                     public void onClick(View v) {
                         onNavigationIconClicked();
                     }
                 });
         mSearchBarView = activity.findViewById(R.id.searchbar_title);
         mCollapsingBarLayout = activity.findViewById(R.id.collapsing_toolbar);
         mDefaultActionBarBackground = mToolbar.getBackground();
         mDefaultOutlineProvider = mToolbar.getOutlineProvider();
         mShowSearchBar = activity.getResources().getBoolean(R.bool.show_search_bar);

         final int[] styledAttrs = {android.R.attr.statusBarColor};
         TypedArray a = mActivity.obtainStyledAttributes(styledAttrs);
         mDefaultStatusBarColorResId = a.getResourceId(0, -1);
         if (mDefaultStatusBarColorResId == -1) {
             Log.w(TAG, "Retrieve statusBarColorResId from theme failed, assigned default");
             mDefaultStatusBarColorResId = R.color.app_background_color;
         }
         a.recycle();

         final Resources resources = mToolbar.getResources();
         final int radius = resources.getDimensionPixelSize(R.dimen.search_bar_radius);
         final int marginStart =
                 resources.getDimensionPixelSize(R.dimen.search_bar_background_margin_start);
         final int marginEnd =
                 resources.getDimensionPixelSize(R.dimen.search_bar_background_margin_end);
         mSearchBarOutlineProvider = new ViewOutlineProvider() {
             @Override
             public void getOutline(View view, Outline outline) {
                 outline.setRoundRect(marginStart, 0,
                         view.getWidth() - marginEnd, view.getHeight(), radius);
             }
         };
     }

     private ProfileTabs getProfileTabs(View tabLayoutContainer, UserIdManager userIdManager,
             UserManagerState userManagerState, BaseActivity activity) {
         return mConfigStore.isPrivateSpaceInDocsUIEnabled()
                 ? new ProfileTabs(tabLayoutContainer, mState, userManagerState, mEnv, activity,
                 mConfigStore)
                 : new ProfileTabs(tabLayoutContainer, mState, userIdManager, mEnv, activity,
                         mConfigStore);
     }

     @Override
     public void onOffsetChanged(AppBarLayout appBarLayout, int offset) {
         if (!VersionUtils.isAtLeastS()) {
             return;
         }

         // For S+ Only. Change toolbar color dynamically based on scroll offset.
         // Usually this can be done in xml using app:contentScrim and app:statusBarScrim, however
         // in our case since we also put directory_header.xml inside the CollapsingToolbarLayout,
         // the scrim will also cover the directory header. Long term need to think about how to
         // move directory_header out of the AppBarLayout.

         Window window = mActivity.getWindow();
         View actionBar =
                 window.getDecorView().findViewById(androidx.appcompat.R.id.action_mode_bar);
         int dynamicHeaderColor = ContextCompat.getColor(mActivity,
                 offset == 0 ? mDefaultStatusBarColorResId : R.color.color_surface_header);
         if (actionBar != null) {
             // Action bar needs to be updated separately for selection mode.
             actionBar.setBackgroundColor(dynamicHeaderColor);
         }

         window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
         window.setStatusBarColor(dynamicHeaderColor);
         if (shouldShowSearchBar()) {
             // Do not change search bar background.
         } else {
             mToolbar.setBackground(new ColorDrawable(dynamicHeaderColor));
         }
     }

     public void setSearchBarClickListener(View.OnClickListener listener) {
         mSearchBarView.setOnClickListener(listener);
         if (SdkLevel.isAtLeastU()) {
             try {
                 mSearchBarView.setHandwritingDelegatorCallback(
                         () -> listener.onClick(mSearchBarView));
             } catch (LinkageError e) {
                 // Running on a device with an older build of Android U
                 // TODO(b/274154553): Remove try/catch block after Android U Beta 1 is released
             }
         }
     }

     public ProfileTabsAddons getProfileTabsAddons() {
         return mProfileTabs;
     }

     /**
      * Sets a listener to the profile tabs.
      */
     public void setProfileTabsListener(ProfileTabs.Listener listener) {
         mProfileTabs.setListener(listener);
     }

     private void onNavigationIconClicked() {
         if (mDrawer.isPresent()) {
             mDrawer.setOpen(true);
         }
     }

     void onNavigationItemSelected(int position) {
         boolean changed = false;
         while (mState.stack.size() > position + 1) {
             changed = true;
             mState.stack.pop();
         }
         if (changed) {
             mEnv.refreshCurrentRootAndDirectory(AnimationView.ANIM_LEAVE);
         }
     }

     public UserId getSelectedUser() {
         return mProfileTabs.getSelectedUser();
     }

     public void setActionModeActivated(boolean actionModeActivated) {
         mIsActionModeActivated = actionModeActivated;
         update();
     }

     public void update() {
         updateScrollFlag();
         updateToolbar();
         mProfileTabs.updateView();

         // TODO: Looks to me like this block is never getting hit.
         if (mEnv.isSearchExpanded()) {
             mToolbar.setTitle(null);
             mBreadcrumb.show(false);
             return;
         }

         mDrawer.setTitle(mEnv.getDrawerTitle());

         mToolbar.setNavigationIcon(getActionBarIcon());
         mToolbar.setNavigationContentDescription(R.string.drawer_open);

         if (shouldShowSearchBar()) {
             mBreadcrumb.show(false);
             mToolbar.setTitle(null);
             mSearchBarView.setVisibility(View.VISIBLE);
         } else {
             mSearchBarView.setVisibility(View.GONE);
             String title = mState.stack.size() <= 1
                     ? mEnv.getCurrentRoot().title : mState.stack.getTitle();
             if (VERBOSE) Log.v(TAG, "New toolbar title is: " + title);
             mToolbar.setTitle(title);
             mBreadcrumb.show(true);
             mBreadcrumb.postUpdate();
         }
     }

     private void updateScrollFlag() {
         if (mCollapsingBarLayout == null) {
             return;
         }

         AppBarLayout.LayoutParams lp =
                 (AppBarLayout.LayoutParams) mCollapsingBarLayout.getLayoutParams();
         lp.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL
                 | AppBarLayout.LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED);
         mCollapsingBarLayout.setLayoutParams(lp);
     }

     private void updateToolbar() {
         if (mCollapsingBarLayout == null) {
             // Tablet mode does not use CollapsingBarLayout
             // (res/layout-sw720dp/directory_app_bar.xml or res/layout/fixed_layout.xml)
             if (shouldShowSearchBar()) {
                 mToolbar.setBackgroundResource(R.drawable.search_bar_background);
                 mToolbar.setOutlineProvider(mSearchBarOutlineProvider);
             } else {
                 mToolbar.setBackground(mDefaultActionBarBackground);
                 mToolbar.setOutlineProvider(null);
             }
             return;
         }

         CollapsingToolbarLayout.LayoutParams toolbarLayoutParams =
                 (CollapsingToolbarLayout.LayoutParams) mToolbar.getLayoutParams();

         int headerTopOffset = 0;
         if (shouldShowSearchBar() && !mIsActionModeActivated) {
             mToolbar.setBackgroundResource(R.drawable.search_bar_background);
             mToolbar.setOutlineProvider(mSearchBarOutlineProvider);
             int searchBarMargin = mToolbar.getResources().getDimensionPixelSize(
                     R.dimen.search_bar_margin);
             toolbarLayoutParams.setMargins(searchBarMargin, searchBarMargin, searchBarMargin,
                     searchBarMargin);
             mToolbar.setLayoutParams(toolbarLayoutParams);
             mToolbar.setElevation(
                     mToolbar.getResources().getDimensionPixelSize(R.dimen.search_bar_elevation));
             headerTopOffset = toolbarLayoutParams.height + searchBarMargin * 2;
         } else {
             mToolbar.setBackground(mDefaultActionBarBackground);
             mToolbar.setOutlineProvider(mDefaultOutlineProvider);
             int actionBarMargin = mToolbar.getResources().getDimensionPixelSize(
                     R.dimen.action_bar_margin);
             toolbarLayoutParams.setMargins(0, 0, 0, /* bottom= */ actionBarMargin);
             mToolbar.setLayoutParams(toolbarLayoutParams);
             mToolbar.setElevation(
                     mToolbar.getResources().getDimensionPixelSize(R.dimen.action_bar_elevation));
             headerTopOffset = toolbarLayoutParams.height + actionBarMargin;
         }

         if (!mIsActionModeActivated) {
             FrameLayout.LayoutParams headerLayoutParams =
                     (FrameLayout.LayoutParams) mHeader.getLayoutParams();
             headerLayoutParams.setMargins(0, /* top= */ headerTopOffset, 0, 0);
             mHeader.setLayoutParams(headerLayoutParams);
         }
     }

     private boolean shouldShowSearchBar() {
         return mState.stack.isRecents() && !mEnv.isSearchExpanded() && mShowSearchBar;
     }

     // Hamburger if drawer is present, else sad nullness.
     private @Nullable
     Drawable getActionBarIcon() {
         if (mDrawer.isPresent()) {
             return mToolbar.getContext().getDrawable(R.drawable.ic_hamburger);
         } else {
             return null;
         }
     }

     void revealRootsDrawer(boolean open) {
         mDrawer.setOpen(open);
     }

     interface Breadcrumb {
         void setup(Environment env, State state, IntConsumer listener);

         void show(boolean visibility);

         void postUpdate();
     }

     interface Environment {
         @Deprecated
             // Use CommonAddones#getCurrentRoot
         RootInfo getCurrentRoot();

         String getDrawerTitle();

         @Deprecated
             // Use CommonAddones#refreshCurrentRootAndDirectory
         void refreshCurrentRootAndDirectory(int animation);

         boolean isSearchExpanded();
     }
 }
	/*
	* Copyright (C) 2016 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.documentsui;

	import static com.android.documentsui.base.SharedMinimal.VERBOSE;

	import android.content.res.Resources;
	import android.content.res.TypedArray;
	import android.graphics.Outline;
	import android.graphics.drawable.ColorDrawable;
	import android.graphics.drawable.Drawable;
	import android.util.Log;
	import android.view.View;
	import android.view.ViewOutlineProvider;
	import android.view.Window;
	import android.view.WindowManager;
	import android.widget.FrameLayout;

	import androidx.annotation.ColorRes;
	import androidx.annotation.Nullable;
	import androidx.appcompat.widget.Toolbar;
	import androidx.core.content.ContextCompat;

	import com.android.documentsui.base.RootInfo;
	import com.android.documentsui.base.State;
	import com.android.documentsui.base.UserId;
	import com.android.documentsui.dirlist.AnimationView;
	import com.android.documentsui.util.VersionUtils;
	import com.android.modules.utils.build.SdkLevel;

	import com.google.android.material.appbar.AppBarLayout;
	import com.google.android.material.appbar.CollapsingToolbarLayout;

	import java.util.function.IntConsumer;

	/**
	* A facade over the portions of the app and drawer toolbars.
	*/
	public class NavigationViewManager implements AppBarLayout.OnOffsetChangedListener {

	private static final String TAG = "NavigationViewManager";

	private final DrawerController mDrawer;
	private final Toolbar mToolbar;
	private final BaseActivity mActivity;
	private final View mHeader;
	private final State mState;
	private final NavigationViewManager.Environment mEnv;
	private final Breadcrumb mBreadcrumb;
	private final ProfileTabs mProfileTabs;
	private final View mSearchBarView;
	private final CollapsingToolbarLayout mCollapsingBarLayout;
	private final Drawable mDefaultActionBarBackground;
	private final ViewOutlineProvider mDefaultOutlineProvider;
	private final ViewOutlineProvider mSearchBarOutlineProvider;
	private final boolean mShowSearchBar;
	private final ConfigStore mConfigStore;

	private boolean mIsActionModeActivated = false;
	@ColorRes
	private int mDefaultStatusBarColorResId;

	public NavigationViewManager(
	BaseActivity activity,
	DrawerController drawer,
	State state,
	NavigationViewManager.Environment env,
	Breadcrumb breadcrumb,
	View tabLayoutContainer,
	UserIdManager userIdManager,
	ConfigStore configStore) {
	this(activity, drawer, state, env, breadcrumb, tabLayoutContainer, userIdManager, null,
	configStore);
	}

	public NavigationViewManager(
	BaseActivity activity,
	DrawerController drawer,
	State state,
	NavigationViewManager.Environment env,
	Breadcrumb breadcrumb,
	View tabLayoutContainer,
	UserManagerState userManagerState,
	ConfigStore configStore) {
	this(activity, drawer, state, env, breadcrumb, tabLayoutContainer, null, userManagerState,
	configStore);
	}

	public NavigationViewManager(
	BaseActivity activity,
	DrawerController drawer,
	State state,
	NavigationViewManager.Environment env,
	Breadcrumb breadcrumb,
	View tabLayoutContainer,
	UserIdManager userIdManager,
	UserManagerState userManagerState,
	ConfigStore configStore) {

	mActivity = activity;
	mToolbar = activity.findViewById(R.id.toolbar);
	mHeader = activity.findViewById(R.id.directory_header);
	mDrawer = drawer;
	mState = state;
	mEnv = env;
	mBreadcrumb = breadcrumb;
	mBreadcrumb.setup(env, state, this::onNavigationItemSelected);
	mConfigStore = configStore;
	mProfileTabs =
	getProfileTabs(tabLayoutContainer, userIdManager, userManagerState, activity);

	mToolbar.setNavigationOnClickListener(
	new View.OnClickListener() {
	@Override
	public void onClick(View v) {
	onNavigationIconClicked();
	}
	});
	mSearchBarView = activity.findViewById(R.id.searchbar_title);
	mCollapsingBarLayout = activity.findViewById(R.id.collapsing_toolbar);
	mDefaultActionBarBackground = mToolbar.getBackground();
	mDefaultOutlineProvider = mToolbar.getOutlineProvider();
	mShowSearchBar = activity.getResources().getBoolean(R.bool.show_search_bar);

	final int[] styledAttrs = {android.R.attr.statusBarColor};
	TypedArray a = mActivity.obtainStyledAttributes(styledAttrs);
	mDefaultStatusBarColorResId = a.getResourceId(0, -1);
	if (mDefaultStatusBarColorResId == -1) {
	Log.w(TAG, "Retrieve statusBarColorResId from theme failed, assigned default");
	mDefaultStatusBarColorResId = R.color.app_background_color;
	}
	a.recycle();

	final Resources resources = mToolbar.getResources();
	final int radius = resources.getDimensionPixelSize(R.dimen.search_bar_radius);
	final int marginStart =
	resources.getDimensionPixelSize(R.dimen.search_bar_background_margin_start);
	final int marginEnd =
	resources.getDimensionPixelSize(R.dimen.search_bar_background_margin_end);
	mSearchBarOutlineProvider = new ViewOutlineProvider() {
	@Override
	public void getOutline(View view, Outline outline) {
	outline.setRoundRect(marginStart, 0,
	view.getWidth() - marginEnd, view.getHeight(), radius);
	}
	};
	}

	private ProfileTabs getProfileTabs(View tabLayoutContainer, UserIdManager userIdManager,
	UserManagerState userManagerState, BaseActivity activity) {
	return mConfigStore.isPrivateSpaceInDocsUIEnabled()
	? new ProfileTabs(tabLayoutContainer, mState, userManagerState, mEnv, activity,
	mConfigStore)
	: new ProfileTabs(tabLayoutContainer, mState, userIdManager, mEnv, activity,
	mConfigStore);
	}

	@Override
	public void onOffsetChanged(AppBarLayout appBarLayout, int offset) {
	if (!VersionUtils.isAtLeastS()) {
	return;
	}

	// For S+ Only. Change toolbar color dynamically based on scroll offset.
	// Usually this can be done in xml using app:contentScrim and app:statusBarScrim, however
	// in our case since we also put directory_header.xml inside the CollapsingToolbarLayout,
	// the scrim will also cover the directory header. Long term need to think about how to
	// move directory_header out of the AppBarLayout.

	Window window = mActivity.getWindow();
	View actionBar =
	window.getDecorView().findViewById(androidx.appcompat.R.id.action_mode_bar);
	int dynamicHeaderColor = ContextCompat.getColor(mActivity,
	offset == 0 ? mDefaultStatusBarColorResId : R.color.color_surface_header);
	if (actionBar != null) {
	// Action bar needs to be updated separately for selection mode.
	actionBar.setBackgroundColor(dynamicHeaderColor);
	}

	window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
	window.setStatusBarColor(dynamicHeaderColor);
	if (shouldShowSearchBar()) {
	// Do not change search bar background.
	} else {
	mToolbar.setBackground(new ColorDrawable(dynamicHeaderColor));
	}
	}

	public void setSearchBarClickListener(View.OnClickListener listener) {
	mSearchBarView.setOnClickListener(listener);
	if (SdkLevel.isAtLeastU()) {
	try {
	mSearchBarView.setHandwritingDelegatorCallback(
	() -> listener.onClick(mSearchBarView));
	} catch (LinkageError e) {
	// Running on a device with an older build of Android U
	// TODO(b/274154553): Remove try/catch block after Android U Beta 1 is released
	}
	}
	}

	public ProfileTabsAddons getProfileTabsAddons() {
	return mProfileTabs;
	}

	/**
	* Sets a listener to the profile tabs.
	*/
	public void setProfileTabsListener(ProfileTabs.Listener listener) {
	mProfileTabs.setListener(listener);
	}

	private void onNavigationIconClicked() {
	if (mDrawer.isPresent()) {
	mDrawer.setOpen(true);
	}
	}

	void onNavigationItemSelected(int position) {
	boolean changed = false;
	while (mState.stack.size() > position + 1) {
	changed = true;
	mState.stack.pop();
	}
	if (changed) {
	mEnv.refreshCurrentRootAndDirectory(AnimationView.ANIM_LEAVE);
	}
	}

	public UserId getSelectedUser() {
	return mProfileTabs.getSelectedUser();
	}

	public void setActionModeActivated(boolean actionModeActivated) {
	mIsActionModeActivated = actionModeActivated;
	update();
	}

	public void update() {
	updateScrollFlag();
	updateToolbar();
	mProfileTabs.updateView();

	// TODO: Looks to me like this block is never getting hit.
	if (mEnv.isSearchExpanded()) {
	mToolbar.setTitle(null);
	mBreadcrumb.show(false);
	return;
	}

	mDrawer.setTitle(mEnv.getDrawerTitle());

	mToolbar.setNavigationIcon(getActionBarIcon());
	mToolbar.setNavigationContentDescription(R.string.drawer_open);

	if (shouldShowSearchBar()) {
	mBreadcrumb.show(false);
	mToolbar.setTitle(null);
	mSearchBarView.setVisibility(View.VISIBLE);
	} else {
	mSearchBarView.setVisibility(View.GONE);
	String title = mState.stack.size() <= 1
	? mEnv.getCurrentRoot().title : mState.stack.getTitle();
	if (VERBOSE) Log.v(TAG, "New toolbar title is: " + title);
	mToolbar.setTitle(title);
	mBreadcrumb.show(true);
	mBreadcrumb.postUpdate();
	}
	}

	private void updateScrollFlag() {
	if (mCollapsingBarLayout == null) {
	return;
	}

	AppBarLayout.LayoutParams lp =
	(AppBarLayout.LayoutParams) mCollapsingBarLayout.getLayoutParams();
	lp.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL
	\| AppBarLayout.LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED);
	mCollapsingBarLayout.setLayoutParams(lp);
	}

	private void updateToolbar() {
	if (mCollapsingBarLayout == null) {
	// Tablet mode does not use CollapsingBarLayout
	// (res/layout-sw720dp/directory_app_bar.xml or res/layout/fixed_layout.xml)
	if (shouldShowSearchBar()) {
	mToolbar.setBackgroundResource(R.drawable.search_bar_background);
	mToolbar.setOutlineProvider(mSearchBarOutlineProvider);
	} else {
	mToolbar.setBackground(mDefaultActionBarBackground);
	mToolbar.setOutlineProvider(null);
	}
	return;
	}

	CollapsingToolbarLayout.LayoutParams toolbarLayoutParams =
	(CollapsingToolbarLayout.LayoutParams) mToolbar.getLayoutParams();

	int headerTopOffset = 0;
	if (shouldShowSearchBar() && !mIsActionModeActivated) {
	mToolbar.setBackgroundResource(R.drawable.search_bar_background);
	mToolbar.setOutlineProvider(mSearchBarOutlineProvider);
	int searchBarMargin = mToolbar.getResources().getDimensionPixelSize(
	R.dimen.search_bar_margin);
	toolbarLayoutParams.setMargins(searchBarMargin, searchBarMargin, searchBarMargin,
	searchBarMargin);
	mToolbar.setLayoutParams(toolbarLayoutParams);
	mToolbar.setElevation(
	mToolbar.getResources().getDimensionPixelSize(R.dimen.search_bar_elevation));
	headerTopOffset = toolbarLayoutParams.height + searchBarMargin * 2;
	} else {
	mToolbar.setBackground(mDefaultActionBarBackground);
	mToolbar.setOutlineProvider(mDefaultOutlineProvider);
	int actionBarMargin = mToolbar.getResources().getDimensionPixelSize(
	R.dimen.action_bar_margin);
	toolbarLayoutParams.setMargins(0, 0, 0, /* bottom= */ actionBarMargin);
	mToolbar.setLayoutParams(toolbarLayoutParams);
	mToolbar.setElevation(
	mToolbar.getResources().getDimensionPixelSize(R.dimen.action_bar_elevation));
	headerTopOffset = toolbarLayoutParams.height + actionBarMargin;
	}

	if (!mIsActionModeActivated) {
	FrameLayout.LayoutParams headerLayoutParams =
	(FrameLayout.LayoutParams) mHeader.getLayoutParams();
	headerLayoutParams.setMargins(0, /* top= */ headerTopOffset, 0, 0);
	mHeader.setLayoutParams(headerLayoutParams);
	}
	}

	private boolean shouldShowSearchBar() {
	return mState.stack.isRecents() && !mEnv.isSearchExpanded() && mShowSearchBar;
	}

	// Hamburger if drawer is present, else sad nullness.
	private @Nullable
	Drawable getActionBarIcon() {
	if (mDrawer.isPresent()) {
	return mToolbar.getContext().getDrawable(R.drawable.ic_hamburger);
	} else {
	return null;
	}
	}

	void revealRootsDrawer(boolean open) {
	mDrawer.setOpen(open);
	}

	interface Breadcrumb {
	void setup(Environment env, State state, IntConsumer listener);

	void show(boolean visibility);

	void postUpdate();
	}

	interface Environment {
	@Deprecated
	// Use CommonAddones#getCurrentRoot
	RootInfo getCurrentRoot();

	String getDrawerTitle();

	@Deprecated
	// Use CommonAddones#refreshCurrentRootAndDirectory
	void refreshCurrentRootAndDirectory(int animation);

	boolean isSearchExpanded();
	}
	}