Add demo for component how to listen container's event

examples/src/main/java/com/tmall/wireless/tangram/example/TangramActivity.java

@@ -65,6 +65,7 @@ import com.tmall.wireless.tangram.example.data.TestViewHolder;
 import com.tmall.wireless.tangram.example.data.TestViewHolderCell;
 import com.tmall.wireless.tangram.example.data.VVTEST;
 import com.tmall.wireless.tangram.example.support.SampleClickSupport;
+import com.tmall.wireless.tangram.example.support.SampleScrollSupport;
 import com.tmall.wireless.tangram.structure.BaseCell;
 import com.tmall.wireless.tangram.structure.viewcreator.ViewHolderCreator;
 import com.tmall.wireless.tangram.support.async.AsyncLoader;
@@ -304,6 +305,9 @@ public class TangramActivity extends Activity {
         } catch (JSONException e) {
             e.printStackTrace();
         }
+
+        //Demo for component to listen container's event
+        engine.register(SampleScrollSupport.class, new SampleScrollSupport(recyclerView));
     }
 
     @Override

examples/src/main/java/com/tmall/wireless/tangram/example/data/TestView.java

@@ -25,11 +25,14 @@
 package com.tmall.wireless.tangram.example.data;
 
 import android.content.Context;
+import android.support.v7.widget.RecyclerView;
 import android.util.AttributeSet;
+import android.util.Log;
 import android.widget.FrameLayout;
 import android.widget.TextView;
 
 import com.tmall.wireless.tangram.example.R;
+import com.tmall.wireless.tangram.example.support.SampleScrollSupport;
 import com.tmall.wireless.tangram.structure.BaseCell;
 import com.tmall.wireless.tangram.structure.CellRender;
 import com.tmall.wireless.tangram.structure.view.ITangramViewLifeCycle;
@@ -37,7 +40,7 @@ import com.tmall.wireless.tangram.structure.view.ITangramViewLifeCycle;
 /**
  * Created by villadora on 15/8/24.
  */
-public class TestView extends FrameLayout implements ITangramViewLifeCycle {
+public class TestView extends FrameLayout implements ITangramViewLifeCycle, SampleScrollSupport.IScrollListener {
     private TextView textView;
     private BaseCell cell;
 
@@ -56,7 +59,7 @@ public class TestView extends FrameLayout implements ITangramViewLifeCycle {
         init();
     }
 
-    private void init(){
+    private void init() {
         inflate(getContext(), R.layout.item, this);
         textView = (TextView) findViewById(R.id.title);
     }
@@ -65,6 +68,10 @@ public class TestView extends FrameLayout implements ITangramViewLifeCycle {
     public void cellInited(BaseCell cell) {
         setOnClickListener(cell);
         this.cell = cell;
+        if (cell.serviceManager != null) {
+            SampleScrollSupport scrollSupport = cell.serviceManager.getService(SampleScrollSupport.class);
+            scrollSupport.register(this);
+        }
     }
 
     @Override
@@ -90,4 +97,14 @@ public class TestView extends FrameLayout implements ITangramViewLifeCycle {
     @Override
     public void postUnBindView(BaseCell cell) {
     }
+
+    @Override
+    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
+        Log.i("TestView", "onScrollStateChanged: ");
+    }
+
+    @Override
+    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
+        Log.i("TestView", "onScrolled: ");
+    }
 }

examples/src/main/java/com/tmall/wireless/tangram/example/support/SampleScrollSupport.java

@@ -0,0 +1,44 @@
+package com.tmall.wireless.tangram.example.support;
+
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.RecyclerView.OnScrollListener;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class SampleScrollSupport {
+    public interface IScrollListener {
+        public void onScrollStateChanged(RecyclerView recyclerView, int newState);
+
+        public void onScrolled(RecyclerView recyclerView, int dx, int dy);
+    }
+
+    private RecyclerView recyclerView;
+
+    private List<IScrollListener> scrollListeners = new ArrayList<>();
+
+    public SampleScrollSupport(RecyclerView recyclerView) {
+        this.recyclerView = recyclerView;
+        recyclerView.addOnScrollListener(new OnScrollListener() {
+            @Override
+            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
+                for (IScrollListener listener : scrollListeners) {
+                    listener.onScrollStateChanged(recyclerView, newState);
+                }
+            }
+
+            @Override
+            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
+                for (IScrollListener listener : scrollListeners) {
+                    listener.onScrolled(recyclerView, dx, dy);
+                }
+            }
+        });
+    }
+
+    public void register(IScrollListener scrollListener) {
+        if (!scrollListeners.contains(scrollListener)) {
+            scrollListeners.add(scrollListener);
+        }
+    }
+}