[Home] Move bottom sheet classes to widget/bottomsheet

chrome/android/java/src/org/chromium/chrome/browser/widget/BottomSheetContentController.java

-// Copyright 2017 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.widget;
-
-import android.content.Context;
-import android.content.res.Resources;
-import android.support.design.internal.BottomNavigationItemView;
-import android.support.design.internal.BottomNavigationMenuView;
-import android.support.design.widget.BottomNavigationView;
-import android.support.design.widget.BottomNavigationView.OnNavigationItemSelectedListener;
-import android.util.AttributeSet;
-import android.view.MenuItem;
-import android.view.View;
-
-import org.chromium.chrome.R;
-import org.chromium.chrome.browser.bookmarks.BookmarkSheetContent;
-import org.chromium.chrome.browser.download.DownloadSheetContent;
-import org.chromium.chrome.browser.history.HistorySheetContent;
-import org.chromium.chrome.browser.suggestions.SuggestionsBottomSheetContent;
-import org.chromium.chrome.browser.tabmodel.TabModelSelector;
-import org.chromium.chrome.browser.util.MathUtils;
-import org.chromium.chrome.browser.widget.BottomSheet.BottomSheetContent;
-
-import java.lang.reflect.Field;
-import java.util.HashMap;
-import java.util.Iterator;
-import java.util.Map;
-import java.util.Map.Entry;
-
-/**
- * Displays and controls a {@link BottomNavigationView} fixed to the bottom of the
- * {@link BottomSheet}. Also manages {@link BottomSheetContent} displayed in the BottomSheet.
- */
-public class BottomSheetContentController extends BottomNavigationView
-        implements BottomSheetObserver, OnNavigationItemSelectedListener {
-    private BottomSheet mBottomSheet;
-    private TabModelSelector mTabModelSelector;
-    private float mDistanceBelowToolbarPx;
-    private int mSelectedItemId;
-    private boolean mDefaultContentInitialized;
-
-    private final Map<Integer, BottomSheetContent> mBottomSheetContents = new HashMap<>();
-
-    public BottomSheetContentController(Context context, AttributeSet atts) {
-        super(context, atts);
-    }
-
-    /**
-     * Initializes the {@link BottomSheetContentController}.
-     * @param bottomSheet The {@link BottomSheet} associated with this bottom nav.
-     * @param controlContainerHeight The height of the control container in px.
-     * @param tabModelSelector The {@link TabModelSelector} for the application.
-     */
-    public void init(BottomSheet bottomSheet, int controlContainerHeight,
-            TabModelSelector tabModelSelector) {
-        mBottomSheet = bottomSheet;
-        mBottomSheet.addObserver(this);
-        mTabModelSelector = tabModelSelector;
-
-        Resources res = getContext().getResources();
-        mDistanceBelowToolbarPx = controlContainerHeight
-                + res.getDimensionPixelOffset(R.dimen.bottom_nav_space_from_toolbar);
-
-        setOnNavigationItemSelectedListener(this);
-        disableShiftingMode();
-    }
-
-    /**
-     * Initialize the default {@link BottomSheetContent}.
-     */
-    public void initializeDefaultContent() {
-        if (mDefaultContentInitialized) return;
-        showBottomSheetContent(R.id.action_home);
-        mDefaultContentInitialized = true;
-    }
-
-    @Override
-    public boolean onNavigationItemSelected(MenuItem item) {
-        if (mSelectedItemId == item.getItemId()) return false;
-
-        showBottomSheetContent(item.getItemId());
-        return true;
-    }
-
-    @Override
-    public void onTransitionPeekToHalf(float transitionFraction) {
-        float offsetY = (mBottomSheet.getMinOffset() - mBottomSheet.getSheetOffsetFromBottom())
-                + mDistanceBelowToolbarPx;
-        setTranslationY((int) Math.max(offsetY, 0f));
-        setVisibility(MathUtils.areFloatsEqual(transitionFraction, 0f) ? View.GONE : View.VISIBLE);
-    }
-
-    @Override
-    public void onSheetOpened() {
-        if (!mDefaultContentInitialized && mTabModelSelector.getCurrentTab() != null) {
-            initializeDefaultContent();
-        }
-    }
-
-    @Override
-    public void onSheetClosed() {
-        Iterator<Entry<Integer, BottomSheetContent>> contentIterator =
-                mBottomSheetContents.entrySet().iterator();
-        while (contentIterator.hasNext()) {
-            Entry<Integer, BottomSheetContent> entry = contentIterator.next();
-            if (entry.getKey() == R.id.action_home) continue;
-
-            entry.getValue().destroy();
-            contentIterator.remove();
-        }
-        // TODO(twellington): determine a policy for destroying the SuggestionsBottomSheetContent.
-
-        if (mSelectedItemId == 0 || mSelectedItemId == R.id.action_home) return;
-
-        showBottomSheetContent(R.id.action_home);
-    }
-
-    @Override
-    public void onLoadUrl(String url) {}
-
-    @Override
-    public void onSheetOffsetChanged(float heightFraction) {}
-
-    // TODO(twellington): remove this once the support library is updated to allow disabling
-    //                    shifting mode or determines shifting mode based on the width of the
-    //                    child views.
-    private void disableShiftingMode() {
-        BottomNavigationMenuView menuView = (BottomNavigationMenuView) getChildAt(0);
-        try {
-            Field shiftingMode = menuView.getClass().getDeclaredField("mShiftingMode");
-            shiftingMode.setAccessible(true);
-            shiftingMode.setBoolean(menuView, false);
-            shiftingMode.setAccessible(false);
-            for (int i = 0; i < menuView.getChildCount(); i++) {
-                BottomNavigationItemView item = (BottomNavigationItemView) menuView.getChildAt(i);
-                item.setShiftingMode(false);
-                // Set the checked value so that the view will be updated.
-                item.setChecked(item.getItemData().isChecked());
-            }
-        } catch (NoSuchFieldException | IllegalAccessException e) {
-            // Do nothing if reflection fails.
-        }
-    }
-
-    private BottomSheetContent getSheetContentForId(int navItemId) {
-        BottomSheetContent content = mBottomSheetContents.get(navItemId);
-        if (content != null) return content;
-
-        if (navItemId == R.id.action_home) {
-            content = new SuggestionsBottomSheetContent(
-                    mTabModelSelector.getCurrentTab().getActivity(), mBottomSheet,
-                    mTabModelSelector);
-        } else if (navItemId == R.id.action_downloads) {
-            content = new DownloadSheetContent(mTabModelSelector.getCurrentTab().getActivity(),
-                    mTabModelSelector.getCurrentModel().isIncognito());
-        } else if (navItemId == R.id.action_bookmarks) {
-            content = new BookmarkSheetContent(mTabModelSelector.getCurrentTab().getActivity());
-        } else if (navItemId == R.id.action_history) {
-            content = new HistorySheetContent(mTabModelSelector.getCurrentTab().getActivity());
-        }
-        mBottomSheetContents.put(navItemId, content);
-        return content;
-    }
-
-    private void showBottomSheetContent(int navItemId) {
-        // There are some bugs related to programatically selecting menu items that are fixed in
-        // newer support library versions.
-        // TODO(twellington): remove this after the support library is rolled.
-        if (mSelectedItemId != 0) getMenu().findItem(mSelectedItemId).setChecked(false);
-        mSelectedItemId = navItemId;
-        getMenu().findItem(mSelectedItemId).setChecked(true);
-
-        mBottomSheet.showContent(getSheetContentForId(mSelectedItemId));
-    }
-}