Shows snackbar in translate infobar, after certain user actions.

chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBarContainer.java

 // Copyright 2013 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.infobar;
 
+import android.app.Activity;
 import android.content.Context;
 import android.view.Gravity;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
 
 import org.chromium.base.ObserverList;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.chrome.R;
+import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.banners.SwipableOverlayView;
+import org.chromium.chrome.browser.snackbar.SnackbarManager;
 import org.chromium.chrome.browser.tab.EmptyTabObserver;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tab.TabObserver;
 import org.chromium.content.browser.ContentViewCore;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.ui.UiUtils;
 import org.chromium.ui.base.DeviceFormFactor;
 
 import java.util.ArrayList;
 
@@ skipping 73 matching lines @@
         @Override
         public void onContentChanged(Tab tab) {
             mTabView.removeOnAttachStateChangeListener(mAttachedStateListener);
             mTabView = tab.getView();
             mTabView.addOnAttachStateChangeListener(mAttachedStateListener);
         }
 
         @Override
         public void onReparentingFinished(Tab tab) {
             setParentView((ViewGroup) tab.getActivity().findViewById(R.id.bottom_container));
+            Activity activity = tab.getActivity();
+            if (activity != null && activity instanceof ChromeActivity) {

[gone, 2017/04/27 18:48:58]

instanceof already includes an implicit null check

[ramyasharma, 2017/04/28 06:35:59]

Thanks Done.

+                mSnackbarManager = ((ChromeActivity) activity).getSnackbarManager();
+            } else {
+                mSnackbarManager = null;
+            }
         }
     };
 
     /**
      * Adds/removes the {@link InfoBarContainer} when the tab's view is attached/detached. This is
      * mostly to ensure the infobars are not shown in tab switcher overview mode.
      */
     private final OnAttachStateChangeListener mAttachedStateListener =
             new OnAttachStateChangeListener() {
         @Override
@@ skipping 23 matching lines @@
 
     /** The view that {@link Tab#getView()} returns. */
     private View mTabView;
 
     /** Whether or not another View is occupying the same space as this one. */
     private boolean mIsObscured;
 
     private final ObserverList<InfoBarContainerObserver> mObservers =
             new ObserverList<InfoBarContainerObserver>();
 
+    /** The snackbar manager instance used by the activity that hosts this infobar. */
+    private SnackbarManager mSnackbarManager;
+
     public InfoBarContainer(Context context, final ViewGroup parentView, Tab tab) {
         super(context, null);
         tab.addObserver(mTabObserver);
         mTabView = tab.getView();
 
+        Activity activity = tab.getActivity();
+        if (activity != null && activity instanceof ChromeActivity) {

[gone, 2017/04/27 18:48:58]

don't duplicate this logic; make a new private function

[ramyasharma, 2017/04/28 06:35:59]

Done. Thanks.

+            mSnackbarManager = ((ChromeActivity) activity).getSnackbarManager();
+        }
+
         // TODO(newt): move this workaround into the infobar views if/when they're scrollable.
         // Workaround for http://crbug.com/407149. See explanation in onMeasure() below.
         setVerticalScrollBarEnabled(false);
 
         FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(
                 LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT, Gravity.BOTTOM);
         int topMarginDp = DeviceFormFactor.isTablet(context)
                 ? TOP_MARGIN_TABLET_DP : TOP_MARGIN_PHONE_DP;
         lp.topMargin = Math.round(topMarginDp * getResources().getDisplayMetrics().density);
         setLayoutParams(lp);
 
         mParentView = parentView;
 
         mLayout = new InfoBarContainerLayout(context);
         addView(mLayout, new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,
                 LayoutParams.WRAP_CONTENT, Gravity.CENTER_HORIZONTAL));
 
         // Chromium's InfoBarContainer may add an InfoBar immediately during this initialization
         // call, so make sure everything in the InfoBarContainer is completely ready beforehand.
         mNativeInfoBarContainer = nativeInit();
     }
 
+    public SnackbarManager getSnackbarManager() {
+        return mSnackbarManager;
+    }
+
     /**
      * Adds an {@link InfoBarContainerObserver}.
      * @param observer The {@link InfoBarContainerObserver} to add.
      */
     public void addObserver(InfoBarContainerObserver observer) {
         mObservers.addObserver(observer);
     }
 
     /**
      * Removes a {@link InfoBarContainerObserver}.
@@ skipping 200 matching lines @@
         }
 
         super.onLayout(changed, l, t, r, b);
     }
 
     private native long nativeInit();
     private native void nativeSetWebContents(
             long nativeInfoBarContainerAndroid, WebContents webContents);
     private native void nativeDestroy(long nativeInfoBarContainerAndroid);
 }