Remove LayoutManagerDocumentTabSwitcher as it is unused.

chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/LayoutManagerDocumentTabSwitcher.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/LayoutManagerDocumentTabSwitcher.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/LayoutManagerDocumentTabSwitcher.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/LayoutManagerDocumentTabSwitcher.java
deleted file mode 100644
index f6c3bf65304e9d454c3abdadc0ffc1a686c4c3fe..0000000000000000000000000000000000000000
--- a/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/LayoutManagerDocumentTabSwitcher.java
+++ /dev/null
@@ -1,270 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.chrome.browser.compositor.layouts;
-
-import android.app.Activity;
-import android.content.Context;
-import android.view.ViewGroup;
-
-import org.chromium.base.ObserverList;
-import org.chromium.chrome.browser.ChromeApplication;
-import org.chromium.chrome.browser.compositor.TitleCache;
-import org.chromium.chrome.browser.compositor.layouts.components.LayoutTab;
-import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager;
-import org.chromium.chrome.browser.compositor.layouts.eventfilter.BlackHoleEventFilter;
-import org.chromium.chrome.browser.compositor.layouts.eventfilter.GestureEventFilter;
-import org.chromium.chrome.browser.compositor.layouts.eventfilter.GestureHandler;
-import org.chromium.chrome.browser.compositor.layouts.phone.StackLayout;
-import org.chromium.chrome.browser.compositor.overlays.SceneOverlay;
-import org.chromium.chrome.browser.contextualsearch.ContextualSearchManagementDelegate;
-import org.chromium.chrome.browser.device.DeviceClassManager;
-import org.chromium.chrome.browser.dom_distiller.ReaderModeManagerDelegate;
-import org.chromium.chrome.browser.tab.Tab;
-import org.chromium.chrome.browser.tabmodel.TabCreatorManager;
-import org.chromium.chrome.browser.tabmodel.TabModelSelector;
-import org.chromium.chrome.browser.widget.OverviewListLayout;
-import org.chromium.content.browser.ContentViewCore;
-import org.chromium.ui.resources.dynamics.DynamicResourceLoader;
-
-/**
- * A {@link Layout} controller for enabling tab switcher on document mode.
- * Note that lots of fields and methods here intentionally duplicate those of LayoutManagerChrome
- * without further refactoring them because because this is for a UX experiment, and
- * we might scrap this as a whole.
- * See https://crbug.com/520327 for more.
- */
-public class LayoutManagerDocumentTabSwitcher
-        extends LayoutManagerDocument implements OverviewModeBehavior {
-    /** A {@link Layout} that should be used when the user is swiping sideways on the toolbar. */
-    private final OverviewListLayout mOverviewListLayout;
-    private final StackLayout mOverviewLayout;
-
-    // Event Filter Handlers
-    /** A {@link GestureHandler} that will delegate all events to {@link #getActiveLayout()}. */
-    private final BlackHoleEventFilter mBlackHoleEventFilter;
-    private final GestureEventFilter mGestureEventFilter;
-
-    private TitleCache mTitleCache;
-    private final ObserverList<OverviewModeObserver> mOverviewModeObservers =
-            new ObserverList<OverviewModeObserver>();
-
-    /**
-     * Creates a {@link LayoutManagerDocumentTabSwitcher} instance.
-     * @param host            A {@link LayoutManagerHost} instance.
-     */
-    public LayoutManagerDocumentTabSwitcher(LayoutManagerHost host) {
-        super(host);
-        Context context = host.getContext();
-        LayoutRenderHost renderHost = host.getLayoutRenderHost();
-
-        mBlackHoleEventFilter = new BlackHoleEventFilter(context, this);
-        mGestureEventFilter = new GestureEventFilter(context, this, mGestureHandler);
-        mOverviewListLayout =
-                new OverviewListLayout(context, this, renderHost, mBlackHoleEventFilter);
-        mOverviewLayout = new StackLayout(context, this, renderHost, mGestureEventFilter);
-    }
-
-    @Override
-    public void init(TabModelSelector selector, TabCreatorManager creator,
-            TabContentManager content, ViewGroup androidContentContainer,
-            ContextualSearchManagementDelegate contextualSearchDelegate,
-            ReaderModeManagerDelegate readerModeManagerDelegate,
-            DynamicResourceLoader dynamicResourceLoader) {
-        super.init(selector, creator, content, androidContentContainer, contextualSearchDelegate,
-                readerModeManagerDelegate, dynamicResourceLoader);
-
-        mTitleCache = mHost.getTitleCache();
-        TabModelSelector documentTabSelector = ChromeApplication.getDocumentTabModelSelector();
-        mOverviewListLayout.setTabModelSelector(documentTabSelector, content);
-        mOverviewLayout.setTabModelSelector(documentTabSelector, content);
-
-        // TODO(changwan): do we really need this?
-        startShowing(getDefaultLayout(), false);
-    }
-
-    @Override
-    public void destroy() {
-        super.destroy();
-
-        if (mOverviewListLayout != null) mOverviewListLayout.destroy();
-        if (mOverviewLayout != null) mOverviewLayout.destroy();
-    }
-
-    /**
-     * Adds the {@link SceneOverlay} across all {@link Layout}s owned by this class.
-     * @param helper A {@link SceneOverlay} instance.
-     */
-    @Override
-    protected void addGlobalSceneOverlay(SceneOverlay helper) {
-        super.addGlobalSceneOverlay(helper);
-        if (mOverviewListLayout != null) {
-            mOverviewListLayout.addSceneOverlay(helper);
-        }
-        if (mOverviewLayout != null) {
-            mOverviewLayout.addSceneOverlay(helper);
-        }
-    }
-
-    @Override
-    public void initLayoutTabFromHost(final int tabId) {
-        if (mTitleCache != null) {
-            mTitleCache.remove(tabId);
-        }
-        super.initLayoutTabFromHost(tabId);
-    }
-
-    @Override
-    public void releaseTabLayout(int id) {
-        super.releaseTabLayout(id);
-        if (mTitleCache != null) mTitleCache.remove(id);
-    }
-
-    @Override
-    public void doneHiding() {
-        super.doneHiding();
-        // Remove transition animation when switching to another tab, in accordance to
-        // moveToFront() in ActivityDelegate.
-        Activity activity = (Activity) mHost.getContext();
-        if (activity != null) {
-            activity.overridePendingTransition(0, 0);
-        }
-    }
-
-    @Override
-    protected void startShowing(Layout layout, boolean animate) {
-        super.startShowing(layout, animate);
-
-        Layout layoutBeingShown = getActiveLayout();
-
-        // Check if we should notify OverviewModeObservers.
-        if (isOverviewLayout(layoutBeingShown)) {
-            boolean showToolbar = false;
-            for (OverviewModeObserver observer : mOverviewModeObservers) {
-                observer.onOverviewModeStartedShowing(showToolbar);
-            }
-        }
-    }
-
-    @Override
-    public void startHiding(int nextTabId, boolean hintAtTabSelection) {
-        super.startHiding(nextTabId, hintAtTabSelection);
-
-        Layout layoutBeingHidden = getActiveLayout();
-        if (isOverviewLayout(layoutBeingHidden)) {
-            boolean showToolbar = true;
-            if (layoutBeingHidden == mOverviewLayout) {
-                final LayoutTab tab = layoutBeingHidden.getLayoutTab(nextTabId);
-                // Note: this value is reversed in LayoutManagerChrome#startHiding.
-                showToolbar = tab != null ? tab.showToolbar() : true;
-            }
-
-            boolean delayAnimation = false;
-            for (OverviewModeObserver observer : mOverviewModeObservers) {
-                observer.onOverviewModeStartedHiding(showToolbar, delayAnimation);
-            }
-        }
-    }
-
-    private boolean isOverviewLayout(Layout layout) {
-        return layout != null && (layout == mOverviewLayout || layout == mOverviewListLayout);
-    }
-
-    @Override
-    public void addOverviewModeObserver(OverviewModeObserver listener) {
-        mOverviewModeObservers.addObserver(listener);
-    }
-
-    @Override
-    public void removeOverviewModeObserver(OverviewModeObserver listener) {
-        mOverviewModeObservers.removeObserver(listener);
-    }
-
-    @Override
-    public boolean overviewVisible() {
-        Layout activeLayout = getActiveLayout();
-        return isOverviewLayout(activeLayout) && !activeLayout.isHiding();
-    }
-
-    public void toggleOverview() {
-        Tab tab = getTabModelSelector().getCurrentTab();
-        ContentViewCore contentViewCore = tab != null ? tab.getContentViewCore() : null;
-
-        if (!overviewVisible()) {
-            mHost.hideKeyboard(new Runnable() {
-                @Override
-                public void run() {
-                    showOverview(true);
-                }
-            });
-            if (contentViewCore != null) {
-                contentViewCore.setAccessibilityState(false);
-            }
-        } else {
-            Layout activeLayout = getActiveLayout();
-            if (activeLayout instanceof StackLayout) {
-                ((StackLayout) activeLayout).commitOutstandingModelState(LayoutManager.time());
-            }
-            if (getTabModelSelector().getCurrentModel().getCount() != 0) {
-                // Don't hide overview if current tab stack is empty()
-                hideOverview(true);
-
-                // hideOverview could change the current tab.  Update the local variables.
-                tab = getTabModelSelector().getCurrentTab();
-                contentViewCore = tab != null ? tab.getContentViewCore() : null;
-
-                if (contentViewCore != null) {
-                    contentViewCore.setAccessibilityState(true);
-                }
-            }
-        }
-    }
-
-    /**
-     * @return Whether or not to use the accessibility layout.
-     */
-    private boolean useAccessibilityLayout() {
-        return DeviceClassManager.isAccessibilityModeEnabled(mHost.getContext())
-                || DeviceClassManager.enableAccessibilityLayout();
-    }
-
-    /**
-     * Show the overview {@link Layout}.  This is generally a {@link Layout} that visibly represents
-     * all of the {@link Tab}s opened by the user.
-     * @param animate Whether or not to animate the transition to overview mode.
-     */
-    private void showOverview(boolean animate) {
-        boolean useAccessibility = useAccessibilityLayout();
-
-        boolean accessibilityIsVisible =
-                useAccessibility && getActiveLayout() == mOverviewListLayout;
-        boolean normalIsVisible = getActiveLayout() == mOverviewLayout && mOverviewLayout != null;
-
-        // We only want to use the AccessibilityOverviewLayout if the following are all valid:
-        // 1. We're already showing the AccessibilityOverviewLayout OR we're using accessibility.
-        // 2. We're not already showing the normal OverviewLayout (or we are on a tablet, in which
-        //    case the normal layout is always visible).
-        if ((accessibilityIsVisible || useAccessibility) && !normalIsVisible) {
-            startShowing(mOverviewListLayout, animate);
-        } else if (mOverviewLayout != null) {
-            startShowing(mOverviewLayout, animate);
-        }
-    }
-
-    /**
-     * Hides the current {@link Layout}, returning to the default {@link Layout}.
-     * @param animate Whether or not to animate the transition to the default {@link Layout}.
-     */
-    private void hideOverview(boolean animate) {
-        Layout activeLayout = getActiveLayout();
-        if (activeLayout != null && !activeLayout.isHiding()) {
-            if (animate) {
-                activeLayout.onTabSelecting(time(), Tab.INVALID_TAB_ID);
-            } else {
-                startHiding(Tab.INVALID_TAB_ID, false);
-                doneHiding();
-            }
-        }
-    }
-}