Fix for issue bmelnychuk#4. 2D scrolling mode added, keep in mind this comes with few limitations: you won't be able not place views on right side like alignParentRight. Everything should be align left. Is not enabled by default

Author: Bogdan Melnychuk

app/src/main/java/com/unnamed/b/atv/sample/activity/MainActivity.java

@@ -13,6 +13,7 @@
 import com.unnamed.b.atv.sample.fragment.CustomViewHolderFragment;
 import com.unnamed.b.atv.sample.fragment.FolderStructureFragment;
 import com.unnamed.b.atv.sample.fragment.SelectableTreeFragment;
+import com.unnamed.b.atv.sample.fragment.TwoDScrollingFragment;
 
 import java.util.ArrayList;
 import java.util.LinkedHashMap;
@@ -32,6 +33,7 @@ protected void onCreate(Bundle savedInstanceState) {
         listItems.put("Folder Structure Example", FolderStructureFragment.class);
         listItems.put("Custom Holder Example", CustomViewHolderFragment.class);
         listItems.put("Selectable Nodes", SelectableTreeFragment.class);
+        listItems.put("2d scrolling", TwoDScrollingFragment.class);
 
 
         final List<String> list = new ArrayList(listItems.keySet());

app/src/main/java/com/unnamed/b/atv/sample/fragment/TwoDScrollingFragment.java

@@ -0,0 +1,70 @@
+package com.unnamed.b.atv.sample.fragment;
+
+import android.app.Fragment;
+import android.os.Bundle;
+import android.text.TextUtils;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import com.unnamed.b.atv.model.TreeNode;
+import com.unnamed.b.atv.sample.R;
+import com.unnamed.b.atv.sample.holder.IconTreeItemHolder;
+import com.unnamed.b.atv.sample.holder.SelectableHeaderHolder;
+import com.unnamed.b.atv.view.AndroidTreeView;
+
+/**
+ * Created by Bogdan Melnychuk on 2/12/15.
+ */
+public class TwoDScrollingFragment extends Fragment {
+    private static final String NAME = "Very long name for folder";
+    private AndroidTreeView tView;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        View rootView = inflater.inflate(R.layout.fragment_selectable_nodes, null, false);
+        rootView.findViewById(R.id.status).setVisibility(View.GONE);
+        ViewGroup containerView = (ViewGroup) rootView.findViewById(R.id.container);
+
+        TreeNode root = TreeNode.root();
+
+        TreeNode s1 = new TreeNode(new IconTreeItemHolder.IconTreeItem(R.string.ic_folder, "Folder with very long name ")).setViewHolder(new SelectableHeaderHolder(getActivity()));
+        TreeNode s2 = new TreeNode(new IconTreeItemHolder.IconTreeItem(R.string.ic_folder, "Another folder with very long name")).setViewHolder(new SelectableHeaderHolder(getActivity()));
+
+        fillFolder(s1);
+        fillFolder(s2);
+
+        root.addChildren(s1, s2);
+
+        tView = new AndroidTreeView(getActivity(), root);
+        tView.setDefaultAnimation(true);
+        tView.setUse2dScroll(true);
+        tView.setDefaultContainerStyle(R.style.TreeNodeStyleCustom);
+        containerView.addView(tView.getView());
+
+        tView.expandAll();
+
+        if (savedInstanceState != null) {
+            String state = savedInstanceState.getString("tState");
+            if (!TextUtils.isEmpty(state)) {
+                tView.restoreState(state);
+            }
+        }
+        return rootView;
+    }
+
+    private void fillFolder(TreeNode folder) {
+        TreeNode currentNode = folder;
+        for (int i = 0; i < 10; i++) {
+            TreeNode file = new TreeNode(new IconTreeItemHolder.IconTreeItem(R.string.ic_folder, NAME)).setViewHolder(new SelectableHeaderHolder(getActivity()));
+            currentNode.addChild(file);
+            currentNode = file;
+        }
+    }
+
+    @Override
+    public void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putString("tState", tView.getSaveState());
+    }
+}

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

@@ -44,6 +44,7 @@
         app:iconSize="24dp" />
 
     <TextView
+        android:layout_marginRight="10dp"
         android:layout_centerVertical="true"
         android:textSize="16sp"
         android:layout_marginLeft="10dp"

library/src/main/java/com/unnamed/b/atv/view/AndroidTreeView.java

@@ -34,6 +34,7 @@ public class AndroidTreeView {
     private TreeNode.TreeNodeClickListener nodeClickListener;
     private boolean mSelectionModeEnabled;
     private boolean mUseDefaultAnimation = false;
+    private boolean use2dScroll = false;
 
     public AndroidTreeView(Context context, TreeNode root) {
         mRoot = root;
@@ -53,6 +54,14 @@ public void setDefaultContainerStyle(int style, boolean applyForRoot) {
         this.applyForRoot = applyForRoot;
     }
 
+    public void setUse2dScroll(boolean use2dScroll) {
+        this.use2dScroll = use2dScroll;
+    }
+
+    public boolean is2dScrollEnabled() {
+        return use2dScroll;
+    }
+
     public void setDefaultViewHolder(Class<? extends TreeNode.BaseNodeViewHolder> viewHolder) {
         defaultViewHolderClass = viewHolder;
     }
@@ -73,12 +82,12 @@ public void collapseAll() {
 
 
     public View getView(int style) {
-        final ScrollView view;
+        final ViewGroup view;
         if (style > 0) {
             ContextThemeWrapper newContext = new ContextThemeWrapper(mContext, style);
-            view = new ScrollView(newContext);
+            view = use2dScroll ? new TwoDScrollView(newContext) : new ScrollView(newContext);
         } else {
-            view = new ScrollView(mContext);
+            view = use2dScroll ? new TwoDScrollView(mContext) : new ScrollView(mContext);
         }
 
         Context containerContext = mContext;