[Android History] Add clear browsing data button and privacy disclaimers

chrome/android/java/src/org/chromium/chrome/browser/history/HistoryAdapter.java

Index: chrome/android/java/src/org/chromium/chrome/browser/history/HistoryAdapter.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/history/HistoryAdapter.java b/chrome/android/java/src/org/chromium/chrome/browser/history/HistoryAdapter.java
index 5ad87ce0f99839ea0df1fc639bdbe31837356f1a..6d53e9796173b9cc1eb1319c97f8cfefb89bfd40 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/history/HistoryAdapter.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/history/HistoryAdapter.java
@@ -5,28 +5,48 @@
 package org.chromium.chrome.browser.history;
 
 import android.support.v7.widget.RecyclerView.ViewHolder;
+import android.text.SpannableString;
+import android.text.method.LinkMovementMethod;
 import android.view.LayoutInflater;
 import android.view.View;
+import android.view.View.OnClickListener;
 import android.view.ViewGroup;
+import android.widget.TextView;
 
+import org.chromium.base.ContextUtils;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.history.BrowsingHistoryBridge.BrowsingHistoryObserver;
 import org.chromium.chrome.browser.widget.DateDividedAdapter;
 import org.chromium.chrome.browser.widget.selection.SelectableItemViewHolder;
 import org.chromium.chrome.browser.widget.selection.SelectionDelegate;
+import org.chromium.components.signin.ChromeSigninController;
+import org.chromium.ui.text.NoUnderlineClickableSpan;
+import org.chromium.ui.text.SpanApplier;
 
 import java.util.List;
+import java.util.Locale;
 
 /**
  * Bridges the user's browsing history and the UI used to display it.
  */
 public class HistoryAdapter extends DateDividedAdapter implements BrowsingHistoryObserver {
     private static final String EMPTY_QUERY = "";
+    private static final String LEARN_MORE_LINK =
+            "https://support.google.com/chrome/?p=sync_history&hl="
+                    + Locale.getDefault().toString();
+    private static final String GOOGLE_HISTORY_LINK = "history.google.com";
 
     private final SelectionDelegate<HistoryItem> mSelectionDelegate;
     private final BrowsingHistoryBridge mBridge;
     private final HistoryManager mManager;
 
+    private TextView mSignedInNotSyncedTextView;
+    private TextView mSignedInSyncedTextView;
+    private TextView mOtherFormsOfBrowsingHistoryTextView;
+
+    private boolean mHasOtherFormsOfBrowsingData;
+    private boolean mHasSyncedData;
+    private boolean mHeaderInflated;
     private boolean mDestroyed;
 
     public HistoryAdapter(SelectionDelegate<HistoryItem> delegate, HistoryManager manager) {
@@ -101,7 +121,11 @@ public class HistoryAdapter extends DateDividedAdapter implements BrowsingHistor
         // destroyed to avoid unnecessary work.
         if (mDestroyed) return;
 
-        loadItems(items);
+        clear(true);
+        if (items.size() > 0) {
+            addHeader();
+            loadItems(items);
+        }
     }
 
     @Override
@@ -111,4 +135,69 @@ public class HistoryAdapter extends DateDividedAdapter implements BrowsingHistor
         //                    This currently removes all items and re-issues a query.
         initialize();
     }
+
+    @Override
+    public void hasOtherFormsOfBrowsingData(boolean hasOtherForms, boolean hasSyncedResults) {
+        mHasOtherFormsOfBrowsingData = hasOtherForms;
+        mHasSyncedData = hasSyncedResults;
+        setPrivacyDisclaimerVisibility();
+    }
+
+    @Override
+    protected HeaderViewHolder createHeader(ViewGroup parent) {
+        ViewGroup v = (ViewGroup) LayoutInflater.from(parent.getContext()).inflate(
+                R.layout.history_header, parent, false);
+        mHeaderInflated = true;
+
+        View cbdButton = v.findViewById(R.id.clear_browsing_data_button);
+        cbdButton.setOnClickListener(new OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mManager.openClearBrowsingDataPreference();
+            }
+        });
+
+        mSignedInNotSyncedTextView = (TextView) v.findViewById(R.id.signed_in_not_synced);
+        setPrivacyDisclaimerText(mSignedInNotSyncedTextView,
+                R.string.android_history_no_synced_results, LEARN_MORE_LINK);
+
+        mSignedInSyncedTextView = (TextView) v.findViewById(R.id.signed_in_synced);
+        setPrivacyDisclaimerText(mSignedInSyncedTextView,
+                R.string.android_history_has_synced_results, LEARN_MORE_LINK);
+
+        mOtherFormsOfBrowsingHistoryTextView = (TextView) v.findViewById(
+                R.id.other_forms_of_browsing_history);
+        setPrivacyDisclaimerText(mOtherFormsOfBrowsingHistoryTextView,
+                R.string.android_history_other_forms_of_history, GOOGLE_HISTORY_LINK);
+
+        setPrivacyDisclaimerVisibility();
+
+        return new HeaderViewHolder(v);
+    }
+
+    private void setPrivacyDisclaimerText(TextView view, int stringId, final  String url) {
+        NoUnderlineClickableSpan link = new NoUnderlineClickableSpan() {
+            @Override
+            public void onClick(View view) {
+                mManager.openUrl(url, null, true);
+            }
+        };
+        SpannableString spannable = SpanApplier.applySpans(
+                view.getResources().getString(stringId),
+                new SpanApplier.SpanInfo("<link>", "</link>", link));
+        view.setText(spannable);
+        view.setMovementMethod(LinkMovementMethod.getInstance());
+    }
+
+    private void setPrivacyDisclaimerVisibility() {
+        if (!mHeaderInflated) return;
+
+        boolean isSignedIn =
+                ChromeSigninController.get(ContextUtils.getApplicationContext()).isSignedIn();
+        mSignedInNotSyncedTextView.setVisibility(
+                !mHasSyncedData && isSignedIn ? View.VISIBLE : View.GONE);
+        mSignedInSyncedTextView.setVisibility(mHasSyncedData ? View.VISIBLE : View.GONE);
+        mOtherFormsOfBrowsingHistoryTextView.setVisibility(
+                mHasOtherFormsOfBrowsingData ? View.VISIBLE : View.GONE);
+    }
 }