Add the ability to re-order sticker packs.

app/src/main/java/org/thoughtcrime/securesms/database/StickerDatabase.java

@@ -5,6 +5,7 @@ import android.content.Context;
 import android.database.Cursor;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+
 import android.text.TextUtils;
 import android.util.Pair;
 
@@ -29,6 +30,7 @@ import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.util.List;
 
 public class StickerDatabase extends Database {
 
@@ -43,6 +45,7 @@ public class StickerDatabase extends Database {
   private static final String STICKER_ID  = "sticker_id";
   private static final String EMOJI       = "emoji";
   private static final String COVER       = "cover";
+  private static final String PACK_ORDER  = "pack_order";
   private static final String INSTALLED   = "installed";
   private static final String LAST_USED   = "last_used";
   public  static final String FILE_PATH   = "file_path";
@@ -56,6 +59,7 @@ public class StickerDatabase extends Database {
                                                                                   PACK_AUTHOR  + " TEXT NOT NULL, " +
                                                                                   STICKER_ID   + " INTEGER, " +
                                                                                   COVER        + " INTEGER, " +
+                                                                                  PACK_ORDER   + " INTEGER, " +
                                                                                   EMOJI        + " TEXT NOT NULL, " +
                                                                                   LAST_USED    + " INTEGER, " +
                                                                                   INSTALLED    + " INTEGER," +
@@ -130,7 +134,7 @@ public class StickerDatabase extends Database {
   public @Nullable Cursor getInstalledStickerPacks() {
     String   selection = COVER + " = ? AND " + INSTALLED + " = ?";
     String[] args      = new String[] { "1", "1" };
-    Cursor   cursor    = databaseHelper.getReadableDatabase().query(TABLE_NAME, null, selection, args, null, null, null);
+    Cursor   cursor    = databaseHelper.getReadableDatabase().query(TABLE_NAME, null, selection, args, null, null, PACK_ORDER + " ASC");
 
     setNotifyStickerPackListeners(cursor);
     return cursor;
@@ -153,7 +157,7 @@ public class StickerDatabase extends Database {
   public @Nullable Cursor getAllStickerPacks(@Nullable String limit) {
     String   query  = COVER + " = ?";
     String[] args   = new String[] { "1" };
-    Cursor   cursor = databaseHelper.getReadableDatabase().query(TABLE_NAME, null, query, args, null, null, null, limit);
+    Cursor   cursor = databaseHelper.getReadableDatabase().query(TABLE_NAME, null, query, args, null, null, PACK_ORDER + " ASC", limit);
     setNotifyStickerPackListeners(cursor);
 
     return cursor;
@@ -272,7 +276,6 @@ public class StickerDatabase extends Database {
 
     db.beginTransaction();
     try {
-
       updatePackInstalled(db, packId, false, false);
       deleteStickersInPackExceptCover(db, packId);
 
@@ -284,6 +287,29 @@ public class StickerDatabase extends Database {
     }
   }
 
+  public void updatePackOrder(@NonNull List<StickerPackRecord> packsInOrder) {
+    SQLiteDatabase db = databaseHelper.getWritableDatabase();
+
+    db.beginTransaction();
+    try {
+      String selection = PACK_ID + " = ? AND " + COVER + " = ?";
+
+      for (int i = 0; i < packsInOrder.size(); i++) {
+        String[]      args   = new String[]{ packsInOrder.get(i).getPackId(), "1" };
+        ContentValues values = new ContentValues();
+
+        values.put(PACK_ORDER, i);
+
+        db.update(TABLE_NAME, values, selection, args);
+      }
+
+      db.setTransactionSuccessful();
+      notifyStickerPackListeners();
+    } finally {
+      db.endTransaction();
+    }
+  }
+
   private void updatePackInstalled(@NonNull SQLiteDatabase db, @NonNull String packId, boolean installed, boolean notify) {
     StickerPackRecord existing = getStickerPack(packId);
 

app/src/main/java/org/thoughtcrime/securesms/database/helpers/SQLCipherOpenHelper.java

@@ -101,8 +101,9 @@ public class SQLCipherOpenHelper extends SQLiteOpenHelper {
   private static final int KEY_VALUE_STORE                  = 41;
   private static final int ATTACHMENT_DISPLAY_ORDER         = 42;
   private static final int SPLIT_PROFILE_NAMES              = 43;
+  private static final int STICKER_PACK_ORDER               = 44;
 
-  private static final int    DATABASE_VERSION = 43;
+  private static final int    DATABASE_VERSION = 44;
   private static final String DATABASE_NAME    = "signal.db";
 
   private final Context        context;
@@ -703,6 +704,10 @@ public class SQLCipherOpenHelper extends SQLiteOpenHelper {
         db.execSQL("ALTER TABLE recipient ADD COLUMN profile_joined_name TEXT DEFAULT NULL");
       }
 
+      if (oldVersion < STICKER_PACK_ORDER) {
+        db.execSQL("ALTER TABLE sticker ADD COLUMN pack_order INTEGER DEFAULT 0");
+      }
+
       db.setTransactionSuccessful();
     } finally {
       db.endTransaction();

app/src/main/java/org/thoughtcrime/securesms/stickers/StickerManagementActivity.java

@@ -5,6 +5,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.ItemTouchHelper;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 import android.view.MenuItem;
@@ -12,6 +13,7 @@ import android.view.MenuItem;
 import org.thoughtcrime.securesms.PassphraseRequiredActionBarActivity;
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.ShareActivity;
+import org.thoughtcrime.securesms.logging.Log;
 import org.thoughtcrime.securesms.mms.GlideApp;
 import org.thoughtcrime.securesms.util.DynamicTheme;
 
@@ -22,9 +24,8 @@ public final class StickerManagementActivity extends PassphraseRequiredActionBar
 
   private final DynamicTheme dynamicTheme = new DynamicTheme();
 
-  private RecyclerView             list;
+  private RecyclerView               list;
-  private StickerManagementAdapter adapter;
+  private StickerManagementAdapter   adapter;
-
   private StickerManagementViewModel viewModel;
 
   public static Intent getIntent(@NonNull Context context) {
@@ -96,6 +97,7 @@ public final class StickerManagementActivity extends PassphraseRequiredActionBar
 
     list.setLayoutManager(new LinearLayoutManager(this));
     list.setAdapter(adapter);
+    new ItemTouchHelper(new StickerManagementItemTouchHelper(new ItemTouchCallback())).attachToRecyclerView(list);
   }
 
   private void initToolbar() {
@@ -114,4 +116,21 @@ public final class StickerManagementActivity extends PassphraseRequiredActionBar
       adapter.setPackLists(packResult.getInstalledPacks(), packResult.getAvailablePacks(), packResult.getBlessedPacks());
     });
   }
+
+  private class ItemTouchCallback implements StickerManagementItemTouchHelper.Callback {
+    @Override
+    public boolean onMove(int start, int end) {
+      return adapter.onMove(start, end);
+    }
+
+    @Override
+    public boolean isMovable(int position) {
+      return adapter.isMovable(position);
+    }
+
+    @Override
+    public void onMoveCommitted() {
+      viewModel.onOrderChanged(adapter.getInstalledPacksInOrder());
+    }
+  }
 }

app/src/main/java/org/thoughtcrime/securesms/stickers/StickerManagementAdapter.java

@@ -29,6 +29,7 @@ import org.thoughtcrime.securesms.util.adapter.SectionedRecyclerViewAdapter;
 import org.thoughtcrime.securesms.util.adapter.StableIdGenerator;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 final class StickerManagementAdapter extends SectionedRecyclerViewAdapter<String, StickerManagementAdapter.StickerSection> {
@@ -93,6 +94,30 @@ final class StickerManagementAdapter extends SectionedRecyclerViewAdapter<String
     }
   }
 
+  boolean onMove(int start, int end) {
+    StickerSection installed = sections.get(0);
+
+    if (!installed.isContent(start)) {
+      return false;
+    }
+
+    if (!installed.isContent(end)) {
+      return false;
+    }
+
+    installed.swap(start, end);
+    notifyItemMoved(start, end);
+    return true;
+  }
+
+  boolean isMovable(int position) {
+    return sections.get(0).isContent(position);
+  }
+
+  @NonNull List<StickerPackRecord> getInstalledPacksInOrder() {
+    return sections.get(0).records;
+  }
+
   void setPackLists(@NonNull List<StickerPackRecord> installedPacks,
                     @NonNull List<StickerPackRecord> availablePacks,
                     @NonNull List<StickerPackRecord> blessedPacks)
@@ -185,6 +210,21 @@ final class StickerManagementAdapter extends SectionedRecyclerViewAdapter<String
         ((StickerViewHolder) viewHolder).bind(glideRequests, eventListener, records.get(localPosition - 1), localPosition == records.size());
       }
     }
+
+    void swap(int start, int end) {
+      int localStart = getLocalPosition(start) - 1;
+      int localEnd   = getLocalPosition(end) - 1;
+
+      if (localStart < localEnd) {
+        for (int i = localStart; i < localEnd; i++) {
+          Collections.swap(records, i, i + 1);
+        }
+      } else {
+        for (int i = localStart; i > localEnd; i--) {
+          Collections.swap(records, i, i - 1);
+        }
+      }
+    }
   }
 
   static class StickerViewHolder extends RecyclerView.ViewHolder {

app/src/main/java/org/thoughtcrime/securesms/stickers/StickerManagementItemTouchHelper.java

@@ -0,0 +1,58 @@
+package org.thoughtcrime.securesms.stickers;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.ItemTouchHelper;
+import androidx.recyclerview.widget.RecyclerView;
+
+public class StickerManagementItemTouchHelper extends ItemTouchHelper.Callback {
+
+  private final Callback callback;
+
+  public StickerManagementItemTouchHelper(Callback callback) {
+    this.callback = callback;
+  }
+
+  @Override
+  public boolean isLongPressDragEnabled() {
+    return true;
+  }
+
+  @Override
+  public boolean isItemViewSwipeEnabled() {
+    return false;
+  }
+
+  @Override
+  public int getMovementFlags(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {
+    if (callback.isMovable(viewHolder.getAdapterPosition())) {
+      int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
+      return makeMovementFlags(dragFlags, 0);
+    } else {
+      return 0;
+    }
+  }
+
+  @Override
+  public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
+    return callback.onMove(viewHolder.getAdapterPosition(), target.getAdapterPosition());
+  }
+
+  @Override
+  public void clearView(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {
+    super.clearView(recyclerView, viewHolder);
+    callback.onMoveCommitted();
+  }
+
+  @Override
+  public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
+  }
+
+  public interface Callback {
+    /**
+     * @return True if both the start and end positions are valid, and therefore the move will occur.
+     */
+    boolean onMove(int start, int end);
+    void onMoveCommitted();
+    boolean isMovable(int position);
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/stickers/StickerManagementRepository.java

@@ -100,6 +100,12 @@ final class StickerManagementRepository {
     });
   }
 
+  void setPackOrder(@NonNull List<StickerPackRecord> packsInOrder) {
+    SignalExecutors.SERIAL.execute(() -> {
+      stickerDatabase.updatePackOrder(packsInOrder);
+    });
+  }
+
   static class PackResult {
 
     private final List<StickerPackRecord> installedPacks;

app/src/main/java/org/thoughtcrime/securesms/stickers/StickerManagementViewModel.java

@@ -10,8 +10,12 @@ import android.os.Handler;
 import androidx.annotation.NonNull;
 
 import org.thoughtcrime.securesms.database.DatabaseContentProviders;
+import org.thoughtcrime.securesms.database.model.StickerPackRecord;
+import org.thoughtcrime.securesms.database.model.StickerRecord;
 import org.thoughtcrime.securesms.stickers.StickerManagementRepository.PackResult;
 
+import java.util.List;
+
 final class StickerManagementViewModel extends ViewModel {
 
   private final Application                 application;
@@ -56,6 +60,10 @@ final class StickerManagementViewModel extends ViewModel {
     repository.installStickerPack(packId, packKey, false);
   }
 
+  void onOrderChanged(List<StickerPackRecord> packsInOrder) {
+    repository.setPackOrder(packsInOrder);
+  }
+
   @Override
   protected void onCleared() {
     application.getContentResolver().unregisterContentObserver(observer);

app/src/main/java/org/thoughtcrime/securesms/util/adapter/SectionedRecyclerViewAdapter.java

@@ -127,6 +127,10 @@ public abstract class SectionedRecyclerViewAdapter<IdType, SectionImpl extends S
       return localPosition >= 0 && localPosition < size();
     }
 
+    public boolean isContent(int globalPosition) {
+      return handles(globalPosition) && getViewType(globalPosition) == TYPE_CONTENT;
+    }
+
     public final int size() {
       if (getContentSize() == 0 && hasEmptyState()) {
         return 2;

app/src/main/res/drawable-v21/selectable_background_dark.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ripple
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="@color/transparent_white_20">
+
+    <item android:id="@+id/mask">
+        <shape>
+            <solid android:color="@color/transparent_black" />
+        </shape>
+    </item>
+
+    <item>
+        <shape android:shape="rectangle" >
+            <solid android:color="@color/core_grey_95"/>
+        </shape>
+    </item>
+</ripple>

app/src/main/res/drawable-v21/selectable_background_light.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ripple
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="@color/transparent_black_20">
+
+    <item android:id="@+id/mask">
+        <shape>
+            <solid android:color="@color/transparent_black" />
+        </shape>
+    </item>
+
+    <item>
+        <shape android:shape="rectangle" >
+            <solid android:color="@color/core_white"/>
+        </shape>
+    </item>
+</ripple>

app/src/main/res/layout/sticker_management_sticker_item.xml

@@ -8,7 +8,7 @@
     android:layout_marginBottom="8dp"
     android:paddingStart="@dimen/sticker_management_horizontal_margin"
     android:paddingEnd="@dimen/sticker_management_horizontal_margin"
-    android:background="?selectableItemBackground">
+    android:background="?sticker_management_item_background">
 
     <ImageView
         android:id="@+id/sticker_management_cover"

app/src/main/res/values/attrs.xml

@@ -232,6 +232,7 @@
     <attr name="sticker_management_divider_color" format="color" />
     <attr name="sticker_management_empty_background_color" format="color" />
     <attr name="sticker_management_action_button_color" format="color" />
+    <attr name="sticker_management_item_background" format="color" />
     <attr name="sticker_popup_background" format="color" />
     <attr name="sticker_preview_toolbar_background" format="color" />
     <attr name="sticker_preview_status_bar_color" format="color" />

app/src/main/res/values/themes.xml

@@ -358,6 +358,7 @@
         <item name="sticker_management_divider_color">@color/core_grey_15</item>
         <item name="sticker_management_empty_background_color">@color/core_grey_05</item>
         <item name="sticker_management_action_button_color">@color/core_grey_90</item>
+        <item name="sticker_management_item_background">@drawable/selectable_background_light</item>
         <item name="sticker_popup_background">@color/transparent_white_60</item>
         <item name="sticker_preview_toolbar_background">@color/core_white</item>
         <item name="sticker_preview_status_bar_color">@color/core_grey_05</item>
@@ -600,6 +601,7 @@
         <item name="sticker_management_divider_color">@color/core_grey_75</item>
         <item name="sticker_management_empty_background_color">@color/core_grey_85</item>
         <item name="sticker_management_action_button_color">@color/core_grey_25</item>
+        <item name="sticker_management_item_background">@drawable/selectable_background_dark</item>
         <item name="sticker_popup_background">@color/transparent_black_60</item>
         <item name="sticker_preview_toolbar_background">@color/core_grey_95</item>
         <item name="sticker_preview_status_bar_color">@color/core_grey_85</item>