add DiffUtil support, update gradle dependencies

example/build.gradle

@@ -24,9 +24,10 @@ dependencies {
 	androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
 		exclude group: 'com.android.support', module: 'support-annotations'
 	})
-	compile 'com.android.support:appcompat-v7:25.1.1'
-	compile "com.android.support:cardview-v7:25.1.1"
-	compile "com.android.support:percent:25.1.1"
+	compile 'com.android.support:appcompat-v7:25.3.0'
+	compile "com.android.support:cardview-v7:25.3.0"
+	compile "com.android.support:percent:25.3.0"
+	compile 'com.android.support:design:25.3.0'
 	testCompile 'junit:junit:4.12'
 	compile project(path: ':rendererrecyclerviewadapter')
 }

example/src/main/java/com/github/vivchar/immutableadapter/MainActivity.java

@@ -2,21 +2,26 @@
 
 import android.os.Bundle;
 import android.support.annotation.NonNull;
+import android.support.v4.widget.SwipeRefreshLayout;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.GridLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.widget.Toast;
 
-import com.github.vivchar.immutableadapter.items.content.ContentModel;
-import com.github.vivchar.immutableadapter.items.content.ContentViewRenderer;
+import com.github.vivchar.immutableadapter.items.BaseItemModel;
 import com.github.vivchar.immutableadapter.items.category.CategoryModel;
 import com.github.vivchar.immutableadapter.items.category.CategoryViewRenderer;
+import com.github.vivchar.immutableadapter.items.content.ContentModel;
+import com.github.vivchar.immutableadapter.items.content.ContentViewRenderer;
 import com.github.vivchar.immutableadapter.items.header.HeaderModel;
 import com.github.vivchar.immutableadapter.items.header.HeaderViewRenderer;
 import com.github.vivchar.rendererrecyclerviewadapter.ItemModel;
 import com.github.vivchar.rendererrecyclerviewadapter.RendererRecyclerViewAdapter;
 
 import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Random;
 
 public
 class MainActivity
@@ -27,13 +32,24 @@ class MainActivity
 	private RendererRecyclerViewAdapter mRecyclerViewAdapter;
 	private RecyclerView mRecyclerView;
 	private GridLayoutManager mLayoutManager;
+	private SwipeRefreshLayout mSwipeToRefresh;
 
 	@Override
 	protected
 	void onCreate(final Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 		setContentView(R.layout.main);
 
+		mSwipeToRefresh = (SwipeRefreshLayout) findViewById(R.id.refresh);
+		mSwipeToRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener()
+		{
+			@Override
+			public
+			void onRefresh() {
+				updateItems();
+			}
+		});
+
 		mRecyclerViewAdapter = new RendererRecyclerViewAdapter();
 		mRecyclerViewAdapter.registerRenderer(new HeaderViewRenderer(HeaderModel.TYPE, this));
 		mRecyclerViewAdapter.registerRenderer(new CategoryViewRenderer(CategoryModel.TYPE, this, mListener));
@@ -60,25 +76,49 @@ int getSpanSize(final int position) {
 		mRecyclerView.setAdapter(mRecyclerViewAdapter);
 		mRecyclerView.addItemDecoration(new EqualSpacesItemDecoration(20));
 
-		mRecyclerViewAdapter.setItems(getItems());
-		mRecyclerViewAdapter.notifyDataSetChanged();
+		updateItems();
+	}
+
+	private
+	void updateItems() {
+//		mRecyclerViewAdapter.setItems(getItems());
+//		mRecyclerViewAdapter.notifyDataSetChanged();
+
+		mRecyclerViewAdapter.setItems(getItems(), mDiffCallback);
+		mSwipeToRefresh.setRefreshing(false);
 	}
 
 	@NonNull
 	private
-	ArrayList<ItemModel> getItems() {
-		final ArrayList<ItemModel> items = new ArrayList<>();
-			items.add(new HeaderModel("header"));
-		for (int i = 0; i < 5; i++) {
-			items.add(new CategoryModel("some category #" + (i + 1)));
-			for (int j = 0; j < 12; j++) {
-				items.add(new ContentModel("content " + (j + 1)));
+	ArrayList<BaseItemModel> getItems() {
+		final ArrayList<BaseItemModel> items = new ArrayList<>();
+		final int headerID = 1;
+		items.add(new HeaderModel(headerID, "header"));
+
+		final int categoryCount = random(3, 9);
+		for (int i = 0; i < categoryCount; i++) {
+			final int categoryID = i * 10;
+			items.add(new CategoryModel(categoryID, "some category #" + (i + 1)));
+
+			final ArrayList<BaseItemModel> content = new ArrayList<>();
+			final int contentCount = random(1, 9);
+			for (int j = 0; j < contentCount; j++) {
+				final int contentID = i * 10 + j;
+				content.add(new ContentModel(contentID, "content " + (j + 1)));
 			}
+			Collections.shuffle(content);
+			items.addAll(content);
 		}
 
 		return items;
 	}
 
+	private
+	int random(final int min, final int max) {
+		final Random random = new Random();
+		return random.nextInt(max - min + 1) + min;
+	}
+
 	@NonNull
 	private final ContentViewRenderer.Listener mListener = new ContentViewRenderer.Listener()
 	{
@@ -94,4 +134,52 @@ void onContentItemClicked(@NonNull final ContentModel model) {
 			Toast.makeText(MainActivity.this, model.getName(), Toast.LENGTH_SHORT).show();
 		}
 	};
+
+	@NonNull
+	private final RendererRecyclerViewAdapter.DiffCallback<BaseItemModel> mDiffCallback = new RendererRecyclerViewAdapter
+			.DiffCallback<BaseItemModel>()
+	{
+
+		private final ArrayList<BaseItemModel> mOldItems = new ArrayList<>();
+		private final ArrayList<BaseItemModel> mNewItems = new ArrayList<>();
+
+		@Override
+		public
+		void setItems(@NonNull final List<BaseItemModel> oldItems, @NonNull final List<BaseItemModel> newItems) {
+			mOldItems.clear();
+			mOldItems.addAll(oldItems);
+
+			mNewItems.clear();
+			mNewItems.addAll(newItems);
+		}
+
+		@Override
+		public
+		int getOldListSize() {
+			return mOldItems.size();
+		}
+
+		@Override
+		public
+		int getNewListSize() {
+			return mNewItems.size();
+		}
+
+		@Override
+		public
+		boolean areItemsTheSame(final int oldItemPosition, final int newItemPosition) {
+			final BaseItemModel oldItem = mOldItems.get(oldItemPosition);
+			final BaseItemModel newItem = mNewItems.get(newItemPosition);
+			return oldItem.getID() == newItem.getID();
+		}
+
+		@Override
+		public
+		boolean areContentsTheSame(final int oldItemPosition, final int newItemPosition) {
+			final ItemModel oldItem = mOldItems.get(oldItemPosition);
+			final ItemModel newItem = mNewItems.get(newItemPosition);
+			return oldItem.equals(newItem);
+		}
+	};
+
 }

example/src/main/java/com/github/vivchar/immutableadapter/items/BaseItemModel.java

@@ -0,0 +1,12 @@
+package com.github.vivchar.immutableadapter.items;
+
+import com.github.vivchar.rendererrecyclerviewadapter.ItemModel;
+
+/**
+ * Created by Vivchar Vitaly on 3/20/17.
+ */
+public interface BaseItemModel
+		extends ItemModel
+{
+	int getID();
+}

example/src/main/java/com/github/vivchar/immutableadapter/items/category/CategoryModel.java

@@ -2,25 +2,33 @@
 
 import android.support.annotation.NonNull;
 
-import com.github.vivchar.rendererrecyclerviewadapter.ItemModel;
+import com.github.vivchar.immutableadapter.items.BaseItemModel;
 
 /**
  * Created by Vivchar Vitaly on 1/10/17.
  */
 public
 class CategoryModel
-		implements ItemModel
+		implements BaseItemModel
 {
 
 	public static final int TYPE = 0;
+	private final int mID;
 	@NonNull
 	private final String mTitle;
 
 	public
-	CategoryModel(@NonNull final String title) {
+	CategoryModel(final int ID, @NonNull final String title) {
+		mID = ID;
 		mTitle = title;
 	}
 
+	@Override
+	public
+	int getID() {
+		return mID;
+	}
+
 	@Override
 	public
 	int getType() {
@@ -32,4 +40,31 @@ int getType() {
 	String getName() {
 		return mTitle;
 	}
+
+	@Override
+	public
+	boolean equals(final Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (o == null || getClass() != o.getClass()) {
+			return false;
+		}
+
+		final CategoryModel that = (CategoryModel) o;
+
+		if (mID != that.mID) {
+			return false;
+		}
+		return mTitle.equals(that.mTitle);
+
+	}
+
+	@Override
+	public
+	int hashCode() {
+		int result = mID;
+		result = 31 * result + mTitle.hashCode();
+		return result;
+	}
 }

example/src/main/java/com/github/vivchar/immutableadapter/items/content/ContentModel.java

@@ -2,24 +2,33 @@
 
 import android.support.annotation.NonNull;
 
-import com.github.vivchar.rendererrecyclerviewadapter.ItemModel;
+import com.github.vivchar.immutableadapter.items.BaseItemModel;
 
 /**
  * Created by Vivchar Vitaly on 1/10/17.
  */
 public
-class ContentModel implements ItemModel
+class ContentModel
+		implements BaseItemModel
 {
 
 	public static final int TYPE = 1;
+	private final int mID;
 	@NonNull
 	private final String mName;
 
 	public
-	ContentModel(@NonNull final String name) {
+	ContentModel(final int ID, @NonNull final String name) {
+		mID = ID;
 		mName = name;
 	}
 
+	@Override
+	public
+	int getID() {
+		return mID;
+	}
+
 	@Override
 	public
 	int getType() {
@@ -31,4 +40,31 @@ int getType() {
 	String getName() {
 		return mName;
 	}
+
+	@Override
+	public
+	boolean equals(final Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (o == null || getClass() != o.getClass()) {
+			return false;
+		}
+
+		final ContentModel that = (ContentModel) o;
+
+		if (mID != that.mID) {
+			return false;
+		}
+		return mName.equals(that.mName);
+
+	}
+
+	@Override
+	public
+	int hashCode() {
+		int result = mID;
+		result = 31 * result + mName.hashCode();
+		return result;
+	}
 }