only update recent emoji on other pages

Closes #3208
// FREEBIE

src/org/thoughtcrime/securesms/components/emoji/EmojiDrawer.java

@@ -154,6 +154,12 @@ public class EmojiDrawer extends Fragment {
       return EmojiPageFragment.newInstance(pages.get(i), listener);
     }
 
+    @Override public void setPrimaryItem(ViewGroup container, int position, Object object) {
+      EmojiPageFragment current = (EmojiPageFragment) object;
+      current.onSelected();
+      super.setPrimaryItem(container, position, object);
+    }
+
     @Override public View getCustomTabView(ViewGroup viewGroup, int i) {
       ImageView image = new ImageView(context);
       image.setScaleType(ScaleType.CENTER_INSIDE);

src/org/thoughtcrime/securesms/components/emoji/EmojiPageFragment.java

@@ -17,13 +17,13 @@ import android.widget.GridView;
 import android.widget.ImageView;
 
 import org.thoughtcrime.securesms.R;
-import org.thoughtcrime.securesms.components.emoji.EmojiPageModel.OnModelChangedListener;
 
 public class EmojiPageFragment extends Fragment {
   private static final String TAG = EmojiPageFragment.class.getSimpleName();
 
   private EmojiPageModel         model;
   private EmojiSelectionListener listener;
+  private GridView               grid;
 
   public static EmojiPageFragment newInstance(@NonNull EmojiPageModel model,
                                               @Nullable EmojiSelectionListener listener)
@@ -34,11 +34,17 @@ public class EmojiPageFragment extends Fragment {
     return fragment;
   }
 
+  public void onSelected() {
+    if (model.isDynamic() && grid != null && grid.getAdapter() != null) {
+      ((EmojiGridAdapter)grid.getAdapter()).notifyDataSetChanged();
+    }
+  }
+
   @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                                Bundle savedInstanceState)
   {
     final View view = inflater.inflate(R.layout.emoji_grid_layout, container, false);
-    final GridView grid = (GridView) view.findViewById(R.id.emoji);
+    grid = (GridView) view.findViewById(R.id.emoji);
     grid.setColumnWidth(getResources().getDimensionPixelSize(R.dimen.emoji_drawer_size) + 2 * getResources().getDimensionPixelSize(R.dimen.emoji_drawer_item_padding));
     grid.setOnItemClickListener(new OnItemClickListener() {
       @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
@@ -46,12 +52,6 @@ public class EmojiPageFragment extends Fragment {
       }
     });
     grid.setAdapter(new EmojiGridAdapter(getActivity(), model));
-    model.setOnModelChangedListener(new OnModelChangedListener() {
-      @Override public void onModelChanged() {
-        ((EmojiGridAdapter)grid.getAdapter()).notifyDataSetChanged();
-      }
-    });
-
     return view;
   }
 

src/org/thoughtcrime/securesms/components/emoji/EmojiPageModel.java

@@ -1,16 +1,7 @@
 package org.thoughtcrime.securesms.components.emoji;
 
-public abstract class EmojiPageModel {
+public interface EmojiPageModel {
-  protected OnModelChangedListener listener;
+  int getIconRes();
-
+  int[] getCodePoints();
-  public abstract int getIconRes();
+  boolean isDynamic();
-  public abstract int[] getCodePoints();
-
-  public void setOnModelChangedListener(OnModelChangedListener listener) {
-    this.listener = listener;
-  }
-
-  interface OnModelChangedListener {
-    void onModelChanged();
-  }
 }

src/org/thoughtcrime/securesms/components/emoji/RecentEmojiPageModel.java

@@ -18,14 +18,13 @@ import java.io.IOException;
 import java.util.Iterator;
 import java.util.LinkedHashSet;
 
-public class RecentEmojiPageModel extends EmojiPageModel {
+public class RecentEmojiPageModel implements EmojiPageModel {
   private static final String TAG                  = RecentEmojiPageModel.class.getSimpleName();
   private static final String EMOJI_LRU_PREFERENCE = "pref_recent_emoji";
   private static final int    EMOJI_LRU_SIZE       = 50;
 
   private final SharedPreferences      prefs;
   private final LinkedHashSet<Integer> recentlyUsed;
-  private       OnModelChangedListener listener;
 
   public RecentEmojiPageModel(Context context) {
     this.prefs        = PreferenceManager.getDefaultSharedPreferences(context);
@@ -54,6 +53,10 @@ public class RecentEmojiPageModel extends EmojiPageModel {
     return toReversePrimitiveArray(recentlyUsed);
   }
 
+  @Override public boolean isDynamic() {
+    return true;
+  }
+
   public void onCodePointSelected(int codePoint) {
     Log.w(TAG, "onCodePointSelected(" + codePoint + ")");
     recentlyUsed.remove(codePoint);
@@ -82,12 +85,6 @@ public class RecentEmojiPageModel extends EmojiPageModel {
         return null;
       }
     }.execute();
-
-    if (listener != null) listener.onModelChanged();
-  }
-
-  @Override public void setOnModelChangedListener(OnModelChangedListener listener) {
-    this.listener = listener;
   }
 
   private LinkedHashSet<Integer> fromHexString(@Nullable LinkedHashSet<String> stringSet) {

src/org/thoughtcrime/securesms/components/emoji/StaticEmojiPageModel.java

@@ -3,7 +3,7 @@ package org.thoughtcrime.securesms.components.emoji;
 import android.support.annotation.DrawableRes;
 import android.support.annotation.NonNull;
 
-public class StaticEmojiPageModel extends EmojiPageModel {
+public class StaticEmojiPageModel implements EmojiPageModel {
   @DrawableRes private final int   icon;
   @NonNull     private final int[] codePoints;
 
@@ -19,4 +19,8 @@ public class StaticEmojiPageModel extends EmojiPageModel {
   @NonNull public int[] getCodePoints() {
     return codePoints;
   }
+
+  @Override public boolean isDynamic() {
+    return false;
+  }
 }