Add onContentSizeChange prop to WebView

Summary: Added support for WebViews to take in an onContentSizeChange prop, which will return a native event that contains the width and height of the html content in the WebView. Also moved the ContentSizeChangeEvent from the recyclerview dir to the uimanager/events dir

Reviewed By: andreicoman11

Differential Revision: D3775399

fbshipit-source-id: 19a0579f8345e5853cc7311b80f1f1393c77ab58

Libraries/Components/WebView/WebView.android.js

@@ -58,6 +58,7 @@ class WebView extends React.Component {
     automaticallyAdjustContentInsets: PropTypes.bool,
     contentInset: EdgeInsetsPropType,
     onNavigationStateChange: PropTypes.func,
+    onContentSizeChange: PropTypes.func,
     startInLoadingState: PropTypes.bool, // force WebView to show loadingView on first load
     style: View.propTypes.style,
 
@@ -219,6 +220,7 @@ class WebView extends React.Component {
         domStorageEnabled={this.props.domStorageEnabled}
         contentInset={this.props.contentInset}
         automaticallyAdjustContentInsets={this.props.automaticallyAdjustContentInsets}
+        onContentSizeChange={this.props.onContentSizeChange}
         onLoadingStart={this.onLoadingStart}
         onLoadingFinish={this.onLoadingFinish}
         onLoadingError={this.onLoadingError}

ReactAndroid/src/main/java/com/facebook/react/uimanager/events/ContentSizeChangeEvent.java

@@ -1,16 +1,13 @@
 // Copyright 2004-present Facebook. All Rights Reserved.
 
-package com.facebook.react.views.recyclerview;
+package com.facebook.react.uimanager.events;
 
 import com.facebook.react.bridge.Arguments;
 import com.facebook.react.bridge.WritableMap;
 import com.facebook.react.uimanager.PixelUtil;
-import com.facebook.react.uimanager.events.Event;
-import com.facebook.react.uimanager.events.RCTEventEmitter;
 
 /**
- * Event dispatched by {@link RecyclerViewBackedScrollView} when total height of it's children
- * changes
+ * Event dispatched when total width or height of a view's children changes
  */
 public class ContentSizeChangeEvent extends Event<ContentSizeChangeEvent> {
 

ReactAndroid/src/main/java/com/facebook/react/views/recyclerview/RecyclerViewBackedScrollView.java

@@ -16,6 +16,7 @@ import com.facebook.infer.annotation.Assertions;
 import com.facebook.react.bridge.ReactContext;
 import com.facebook.react.common.annotations.VisibleForTesting;
 import com.facebook.react.uimanager.UIManagerModule;
+import com.facebook.react.uimanager.events.ContentSizeChangeEvent;
 import com.facebook.react.uimanager.events.NativeGestureUtil;
 import com.facebook.react.views.scroll.ScrollEvent;
 import com.facebook.react.views.scroll.ScrollEventType;
@@ -174,7 +175,6 @@ public class RecyclerViewBackedScrollView extends RecyclerView {
       }
       return mOffsetForLastPosition;
     }
-
   }
 
   /*package*/ static class ReactListAdapter extends Adapter<ConcreteViewHolder> {

ReactAndroid/src/main/java/com/facebook/react/views/webview/ReactWebViewManager.java

@@ -15,18 +15,18 @@ import java.io.UnsupportedEncodingException;
 import java.util.HashMap;
 import java.util.Map;
 
+import android.content.Intent;
 import android.graphics.Bitmap;
+import android.graphics.Picture;
+import android.net.Uri;
 import android.os.Build;
 import android.text.TextUtils;
 import android.view.ViewGroup.LayoutParams;
 import android.webkit.GeolocationPermissions;
+import android.webkit.WebChromeClient;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
-import android.webkit.WebChromeClient;
 
-import com.facebook.react.views.webview.events.TopLoadingErrorEvent;
-import com.facebook.react.views.webview.events.TopLoadingFinishEvent;
-import com.facebook.react.views.webview.events.TopLoadingStartEvent;
 import com.facebook.react.bridge.Arguments;
 import com.facebook.react.bridge.LifecycleEventListener;
 import com.facebook.react.bridge.ReactContext;
@@ -40,10 +40,12 @@ import com.facebook.react.uimanager.SimpleViewManager;
 import com.facebook.react.uimanager.ThemedReactContext;
 import com.facebook.react.uimanager.UIManagerModule;
 import com.facebook.react.uimanager.annotations.ReactProp;
+import com.facebook.react.uimanager.events.ContentSizeChangeEvent;
 import com.facebook.react.uimanager.events.Event;
 import com.facebook.react.uimanager.events.EventDispatcher;
-import android.content.Intent;
-import android.net.Uri;
+import com.facebook.react.views.webview.events.TopLoadingErrorEvent;
+import com.facebook.react.views.webview.events.TopLoadingFinishEvent;
+import com.facebook.react.views.webview.events.TopLoadingStartEvent;
 
 /**
  * Manages instances of {@link WebView}
@@ -85,6 +87,7 @@ public class ReactWebViewManager extends SimpleViewManager<WebView> {
   private static final String BLANK_URL = "about:blank";
 
   private WebViewConfig mWebViewConfig;
+  private @Nullable WebView.PictureListener mPictureListener;
 
   private static class ReactWebViewClient extends WebViewClient {
 
@@ -118,11 +121,11 @@ public class ReactWebViewManager extends SimpleViewManager<WebView> {
         if (url.startsWith("http://") || url.startsWith("https://")) {
           return false;
         } else {
-          Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); 
+          Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
           intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-          view.getContext().startActivity(intent);   
-          return true;   
-        }              
+          view.getContext().startActivity(intent);
+          return true;
+        }
     }
 
     @Override
@@ -166,13 +169,6 @@ public class ReactWebViewManager extends SimpleViewManager<WebView> {
               createWebViewEvent(webView, url)));
     }
 
-    private static void dispatchEvent(WebView webView, Event event) {
-      ReactContext reactContext = (ReactContext) webView.getContext();
-      EventDispatcher eventDispatcher =
-          reactContext.getNativeModule(UIManagerModule.class).getEventDispatcher();
-      eventDispatcher.dispatchEvent(event);
-    }
-
     private WritableMap createWebViewEvent(WebView webView, String url) {
       WritableMap event = Arguments.createMap();
       event.putDouble("target", webView.getId());
@@ -295,7 +291,6 @@ public class ReactWebViewManager extends SimpleViewManager<WebView> {
     view.getSettings().setDomStorageEnabled(enabled);
   }
 
-
   @ReactProp(name = "userAgent")
   public void setUserAgent(WebView view, @Nullable String userAgent) {
     if (userAgent != null) {
@@ -368,6 +363,15 @@ public class ReactWebViewManager extends SimpleViewManager<WebView> {
     view.loadUrl(BLANK_URL);
   }
 
+  @ReactProp(name = "onContentSizeChange")
+  public void setOnContentSizeChange(WebView view, boolean sendContentSizeChangeEvents) {
+    if (sendContentSizeChangeEvents) {
+      view.setPictureListener(getPictureListener());
+    } else {
+      view.setPictureListener(null);
+    }
+  }
+
   @Override
   protected void addEventEmitters(ThemedReactContext reactContext, WebView view) {
     // Do not register default touch emitter and let WebView implementation handle touches
@@ -407,4 +411,28 @@ public class ReactWebViewManager extends SimpleViewManager<WebView> {
     ((ThemedReactContext) webView.getContext()).removeLifecycleEventListener((ReactWebView) webView);
     ((ReactWebView) webView).cleanupCallbacksAndDestroy();
   }
+
+  private WebView.PictureListener getPictureListener() {
+    if (mPictureListener == null) {
+      mPictureListener = new WebView.PictureListener() {
+        @Override
+        public void onNewPicture(WebView webView, Picture picture) {
+          dispatchEvent(
+            webView,
+            new ContentSizeChangeEvent(
+              webView.getId(),
+              webView.getWidth(),
+              webView.getContentHeight()));
+        }
+      };
+    }
+    return mPictureListener;
+  }
+
+  private static void dispatchEvent(WebView webView, Event event) {
+    ReactContext reactContext = (ReactContext) webView.getContext();
+    EventDispatcher eventDispatcher =
+      reactContext.getNativeModule(UIManagerModule.class).getEventDispatcher();
+    eventDispatcher.dispatchEvent(event);
+  }
 }