Add support for finding multiple views with NativeIds using a single listener

Reviewed By: mdvacca

Differential Revision: D6735460

fbshipit-source-id: e038a68637a00fda7058fc82e253ae68cdf67c6e

Author: axe-fb

ReactAndroid/src/main/java/com/facebook/react/uimanager/util/ReactFindViewUtil.java

@@ -2,23 +2,25 @@
 
 package com.facebook.react.uimanager.util;
 
-import javax.annotation.Nullable;
-
-import java.util.ArrayList;
-import java.util.Iterator;
-import java.util.List;
-
 import android.view.View;
 import android.view.ViewGroup;
-
 import com.facebook.react.R;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import javax.annotation.Nullable;
 
 /**
  * Finds views in React Native view hierarchies
  */
 public class ReactFindViewUtil {
 
   private static final List<OnViewFoundListener> mOnViewFoundListeners = new ArrayList<>();
+  private static final Map<OnMultipleViewsFoundListener, Set<String>>
+      mOnMultipleViewsFoundListener = new HashMap<>();
 
   /**
    * Callback to be invoked when a react native view has been found
@@ -37,6 +39,18 @@ public interface OnViewFoundListener {
     void onViewFound(View view);
   }
 
+  /**
+   * Callback to be invoked when all react native views with geiven NativeIds have been found
+   */
+  public interface OnMultipleViewsFoundListener{
+
+    void onViewFound(View view, String nativeId);
+    /**
+     * Called when all teh views have been found
+     * @param map
+     */
+  }
+
   /**
    * Finds a view that is tagged with {@param nativeId} as its nativeID prop
    * under the {@param root} view hierarchy. Returns the view if found, null otherwise.
@@ -90,6 +104,14 @@ public static void removeViewListener(OnViewFoundListener onViewFoundListener) {
     mOnViewFoundListeners.remove(onViewFoundListener);
   }
 
+  public static void addViewsListener(OnMultipleViewsFoundListener listener, Set<String> ids) {
+    mOnMultipleViewsFoundListener.put(listener, ids);
+  }
+
+  public static void removeViewsListener(OnMultipleViewsFoundListener listener) {
+    mOnMultipleViewsFoundListener.remove(listener);
+  }
+
   /**
    * Invokes any listeners that are listening on this {@param view}'s native id
    */
@@ -106,6 +128,21 @@ public static void notifyViewRendered(View view) {
         iterator.remove();
       }
     }
+
+    Iterator<Map.Entry<OnMultipleViewsFoundListener, Set<String>>>
+        viewIterator = mOnMultipleViewsFoundListener.entrySet().iterator();
+    while (viewIterator.hasNext()) {
+      Map.Entry<OnMultipleViewsFoundListener, Set<String>> entry =
+          viewIterator.next();
+      Set<String> nativeIds = entry.getValue();
+      if (nativeIds.contains(nativeId)) {
+        entry.getKey().onViewFound(view, nativeId);
+        nativeIds.remove(nativeId); // remove it from list of NativeIds to search for.
+      }
+      if (nativeIds.isEmpty()) {
+        viewIterator.remove();
+      }
+    }
   }
 
   private static @Nullable String getNativeId(View view) {