Bug 1277978 - Part 4 - Actually cache the recent tabs count when it updates. r=liuche

MozReview-Commit-ID: JUsM3qdxhIr

--HG--
extra : rebase_source : 77803ad4760a09088ce96440ef070ce7582673fe
extra : source : cbb19ca2d2454c1d4f938f96e0e34f54d93bf006

mobile/android/base/java/org/mozilla/gecko/home/CombinedHistoryAdapter.java

@@ -39,6 +39,8 @@ public class CombinedHistoryAdapter extends RecyclerView.Adapter<CombinedHistory
         OLDER_THAN_SIX_MONTHS
     }
 
+    private HomeFragment.PanelStateChangeListener panelStateChangeListener;
+
     private Cursor historyCursor;
     private DevicesUpdateHandler devicesUpdateHandler;
     private int deviceCount = 0;
@@ -57,6 +59,11 @@ public class CombinedHistoryAdapter extends RecyclerView.Adapter<CombinedHistory
         this.setHasStableIds(true);
     }
 
+    public void setPanelStateChangeListener(
+            HomeFragment.PanelStateChangeListener panelStateChangeListener) {
+        this.panelStateChangeListener = panelStateChangeListener;
+    }
+
     @UiThread
     public void setLinearLayoutManager(LinearLayoutManager linearLayoutManager) {
         this.linearLayoutManager = linearLayoutManager;
@@ -136,6 +143,10 @@ public class CombinedHistoryAdapter extends RecyclerView.Adapter<CombinedHistory
                         } else {
                             notifyItemRemoved(RECENT_TABS_SMARTFOLDER_INDEX);
                         }
+
+                        if (countReliable) {
+                            panelStateChangeListener.setCachedRecentTabsCount(recentTabsCount);
+                        }
                     }
                 });
             }

mobile/android/base/java/org/mozilla/gecko/home/CombinedHistoryPanel.java

@@ -111,6 +111,9 @@ public class CombinedHistoryPanel extends HomeFragment implements RemoteClientsD
         super.onCreate(savedInstance);
 
         mHistoryAdapter = new CombinedHistoryAdapter(getResources());
+        if (mPanelStateChangeListener != null) {
+            mHistoryAdapter.setPanelStateChangeListener(mPanelStateChangeListener);
+        }
         mClientsAdapter = new ClientsAdapter(getContext());
         // The RecentTabsAdapter doesn't use a cursor and therefore can't use the CursorLoader's
         // onLoadFinished() callback for updating the panel state when the closed tab count changes.
@@ -239,6 +242,15 @@ public class CombinedHistoryPanel extends HomeFragment implements RemoteClientsD
         recentTabsText.setText(R.string.home_last_tabs_empty);
     }
 
+    @Override
+    public void setPanelStateChangeListener(
+            PanelStateChangeListener panelStateChangeListener) {
+        super.setPanelStateChangeListener(panelStateChangeListener);
+        if (mHistoryAdapter != null) {
+            mHistoryAdapter.setPanelStateChangeListener(panelStateChangeListener);
+        }
+    }
+
     @Override
     public void restoreData(Bundle data) {
         if (mRecyclerView != null) {