Animate floating action button

DialtactsActivity now implements ViewPager.OnPageChangeListener,
so that it can animate the floating action button in response
to page changed events in ListsFragments. Because ViewPagerTabs
also needs to listen to page changed events and ViewPager only
supports one OnPageChangeListener, ListsFragments is now in charge
of listening to page changed events from ViewPager and firing off
the same events to multiple OnpageChangedListeners

Bug: 14281810

Change-Id: Ic9b7ca8669d3a9cc0a997a84afe6788d6fd51bb9

1 files changed, 46 insertions, 6 deletions

diff --git a/src/com/android/dialer/list/ListsFragment.java b/src/com/android/dialer/list/ListsFragment.java
index 676b3b075..a61d8a55f 100644
--- a/src/com/android/dialer/list/ListsFragment.java
+++ b/src/com/android/dialer/list/ListsFragment.java
@@ -14,6 +14,7 @@ import android.os.Bundle;
 import android.provider.CallLog;
 import android.support.v13.app.FragmentPagerAdapter;
 import android.support.v4.view.ViewPager;
+import android.support.v4.view.ViewPager.OnPageChangeListener;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -22,6 +23,7 @@ import android.widget.ListView;
 
 import com.android.contacts.common.GeoUtil;
 import com.android.dialer.DialtactsActivity;
+
 import android.view.View.OnClickListener;
 
 import com.android.dialer.R;
@@ -32,6 +34,8 @@ import com.android.dialer.calllog.CallLogQueryHandler;
 import com.android.dialer.calllog.ContactInfoHelper;
 import com.android.dialerbind.ObjectFactory;
 
+import java.util.ArrayList;
+
 /**
  * Fragment that is used as the main screen of the Dialer.
  *
@@ -41,11 +45,11 @@ import com.android.dialerbind.ObjectFactory;
  * screen.
  */
 public class ListsFragment extends Fragment implements CallLogQueryHandler.Listener,
-        CallLogAdapter.CallFetcher {
+        CallLogAdapter.CallFetcher, ViewPager.OnPageChangeListener {
 
-    private static final int TAB_INDEX_SPEED_DIAL = 0;
-    private static final int TAB_INDEX_RECENTS = 1;
-    private static final int TAB_INDEX_ALL_CONTACTS = 2;
+    public static final int TAB_INDEX_SPEED_DIAL = 0;
+    public static final int TAB_INDEX_RECENTS = 1;
+    public static final int TAB_INDEX_ALL_CONTACTS = 2;
 
     private static final int TAB_INDEX_COUNT = 3;
 
@@ -64,10 +68,13 @@ public class ListsFragment extends Fragment implements CallLogQueryHandler.Liste
     }
 
     private ViewPager mViewPager;
+    private ViewPagerTabs mViewPagerTabs;
     private ViewPagerAdapter mViewPagerAdapter;
     private SpeedDialFragment mSpeedDialFragment;
     private CallLogFragment mRecentsFragment;
     private AllContactsFragment mAllContactsFragment;
+    private ArrayList<OnPageChangeListener> mOnPageChangeListeners =
+            new ArrayList<OnPageChangeListener>();
 
     private String[] mTabTitles;
 
@@ -204,14 +211,16 @@ public class ListsFragment extends Fragment implements CallLogQueryHandler.Liste
         mViewPagerAdapter = new ViewPagerAdapter(getChildFragmentManager());
         mViewPager.setAdapter(mViewPagerAdapter);
         mViewPager.setOffscreenPageLimit(2);
+        mViewPager.setOnPageChangeListener(this);
 
         mTabTitles = new String[TAB_INDEX_COUNT];
         mTabTitles[TAB_INDEX_SPEED_DIAL] = getResources().getString(R.string.tab_speed_dial);
         mTabTitles[TAB_INDEX_RECENTS] = getResources().getString(R.string.tab_recents);
         mTabTitles[TAB_INDEX_ALL_CONTACTS] = getResources().getString(R.string.tab_all_contacts);
 
-        ViewPagerTabs tabs = (ViewPagerTabs) parentView.findViewById(R.id.lists_pager_header);
-        tabs.setViewPager(mViewPager);
+        mViewPagerTabs = (ViewPagerTabs) parentView.findViewById(R.id.lists_pager_header);
+        mViewPagerTabs.setViewPager(mViewPager);
+        addOnPageChangeListener(mViewPagerTabs);
 
         final ListView shortcutCardsListView =
                 (ListView) parentView.findViewById(R.id.shortcut_card_list);
@@ -255,4 +264,35 @@ public class ListsFragment extends Fragment implements CallLogQueryHandler.Liste
                 .apply();
         fetchCalls();
     }
+
+    public void addOnPageChangeListener(OnPageChangeListener onPageChangeListener) {
+        if (!mOnPageChangeListeners.contains(onPageChangeListener)) {
+            mOnPageChangeListeners.add(onPageChangeListener);
+        }
+    }
+
+    @Override
+    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+        final int count = mOnPageChangeListeners.size();
+        for (int i = 0; i < count; i++) {
+            mOnPageChangeListeners.get(i).onPageScrolled(position, positionOffset,
+                    positionOffsetPixels);
+        }
+    }
+
+    @Override
+    public void onPageSelected(int position) {
+        final int count = mOnPageChangeListeners.size();
+        for (int i = 0; i < count; i++) {
+            mOnPageChangeListeners.get(i).onPageSelected(position);
+        }
+    }
+
+    @Override
+    public void onPageScrollStateChanged(int state) {
+        final int count = mOnPageChangeListeners.size();
+        for (int i = 0; i < count; i++) {
+            mOnPageChangeListeners.get(i).onPageScrollStateChanged(state);
+        }
+    }
 }