🏠 Add expand button and flag to enable it

chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.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.bottomsheet;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
@@ skipping 25 matching lines @@
 import org.chromium.chrome.browser.TabLoadStatus;
 import org.chromium.chrome.browser.firstrun.FirstRunStatus;
 import org.chromium.chrome.browser.fullscreen.ChromeFullscreenManager;
 import org.chromium.chrome.browser.ntp.NativePageFactory;
 import org.chromium.chrome.browser.ntp.NewTabPage;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tabmodel.EmptyTabModelSelectorObserver;
 import org.chromium.chrome.browser.tabmodel.TabModel;
 import org.chromium.chrome.browser.tabmodel.TabModelSelector;
 import org.chromium.chrome.browser.toolbar.BottomToolbarPhone;
+import org.chromium.chrome.browser.util.FeatureUtilities;
 import org.chromium.chrome.browser.util.MathUtils;
 import org.chromium.chrome.browser.widget.FadingBackgroundView;
 import org.chromium.chrome.browser.widget.bottomsheet.BottomSheetContentController.ContentType;
 import org.chromium.chrome.browser.widget.textbubble.ViewAnchoredTextBubble;
 import org.chromium.content_public.browser.LoadUrlParams;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.util.ArrayList;
 import java.util.List;
@@ skipping 319 matching lines @@
         addObserver(mMetrics);
     }
 
     /**
      * Sets whether the {@link BottomSheet} and its children should react to touch events.
      */
     public void setTouchEnabled(boolean enabled) {
         mIsTouchEnabled = enabled;
     }
 
+    /**
+     * A notification that the "expand" button for the bottom sheet has been pressed.
+     */
+    public void onExpandButtonPressed() {
+        mMetrics.recordSheetOpenReason(BottomSheetMetrics.OPENED_BY_EXPAND_BUTTON);
+        setSheetState(BottomSheet.SHEET_STATE_HALF, true);
+    }
+
     @Override
     public boolean onInterceptTouchEvent(MotionEvent e) {
         // If touch is disabled, act like a black hole and consume touch events without doing
         // anything with them.
         if (!mIsTouchEnabled) return true;
 
         if (!canMoveSheet()) return false;
 
         // The incoming motion event may have been adjusted by the view sending it down. Create a
         // motion event with the raw (x, y) coordinates of the original so the gesture detector
@@ skipping 744 matching lines @@
 
     /**
      * Checks whether the sheet can be moved. It cannot be moved when the activity is in overview
      * mode, when "find in page" is visible, or when the toolbar is hidden.
      */
     private boolean canMoveSheet() {
         boolean isInOverviewMode = mTabModelSelector != null
                 && (mTabModelSelector.getCurrentTab() == null
                            || mTabModelSelector.getCurrentTab().getActivity().isInOverviewMode());
 
+        // If the expand button is enabled, do not allow swiping when the sheet is in the peeking
+        // position.
+        boolean blockPeekingSwipes = FeatureUtilities.isChromeHomeExpandButtonEnabled()
+                && getSheetState() == SHEET_STATE_PEEK;
+
         if (mFindInPageView == null) mFindInPageView = findViewById(R.id.find_toolbar);
         boolean isFindInPageVisible =
                 mFindInPageView != null && mFindInPageView.getVisibility() == View.VISIBLE;
-        return !isToolbarAndroidViewHidden() && !isInOverviewMode && !isFindInPageVisible;
+        return !isToolbarAndroidViewHidden() && !isInOverviewMode && !isFindInPageVisible
+                && !blockPeekingSwipes;
     }
 
     private void showHelpBubbleIfNecessary() {
         // The help bubble should only be shown after layout has occurred so that the anchor view is
         // in the correct position on the screen. It also must be shown after the tab state has been
         // initialized so that any tab that auto-opens the BottomSheet has had a chance to do so.
         assert mHasRootLayoutOccurred && mTabModelSelector != null
                 && mTabModelSelector.isTabStateInitialized();
 
         // If FRE is not complete, the FRE screen is likely covering ChromeTabbedActivity so the
         // help bubble should not be shown. Also skip showing if the bottom sheet is already open.
         if (!FirstRunStatus.getFirstRunFlowComplete() || mCurrentState != SHEET_STATE_PEEK) return;
 
         SharedPreferences preferences = ContextUtils.getAppSharedPreferences();
         if (preferences.getBoolean(BOTTOM_SHEET_HELP_BUBBLE_SHOWN, false)) return;
 
         ViewAnchoredTextBubble helpBubble = new ViewAnchoredTextBubble(
                 getContext(), mControlContainer, R.string.bottom_sheet_help_bubble_message);
         int inset = getContext().getResources().getDimensionPixelSize(
                 R.dimen.bottom_sheet_help_bubble_inset);
         helpBubble.setInsetPx(0, inset, 0, inset);
         helpBubble.setDismissOnTouchInteraction(true);
         helpBubble.show();
 
         preferences.edit().putBoolean(BOTTOM_SHEET_HELP_BUBBLE_SHOWN, true).apply();
     }
 }