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ReactRootView.java
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ReactRootView.java
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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
package com.facebook.react;
import javax.annotation.Nullable;
import android.content.Context;
import android.graphics.Rect;
import android.os.Build;
import android.os.Bundle;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.MotionEvent;
import android.view.Surface;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.view.WindowManager;
import com.facebook.common.logging.FLog;
import com.facebook.infer.annotation.Assertions;
import com.facebook.react.bridge.Arguments;
import com.facebook.react.bridge.CatalystInstance;
import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.UiThreadUtil;
import com.facebook.react.bridge.WritableMap;
import com.facebook.react.bridge.WritableNativeMap;
import com.facebook.react.common.ReactConstants;
import com.facebook.react.common.annotations.VisibleForTesting;
import com.facebook.react.modules.appregistry.AppRegistry;
import com.facebook.react.modules.core.DeviceEventManagerModule;
import com.facebook.react.modules.deviceinfo.DeviceInfoModule;
import com.facebook.react.uimanager.DisplayMetricsHolder;
import com.facebook.react.uimanager.JSTouchDispatcher;
import com.facebook.react.uimanager.PixelUtil;
import com.facebook.react.uimanager.RootView;
import com.facebook.react.uimanager.SizeMonitoringFrameLayout;
import com.facebook.react.uimanager.UIManagerModule;
import com.facebook.react.uimanager.events.EventDispatcher;
import com.facebook.systrace.Systrace;
import static com.facebook.systrace.Systrace.TRACE_TAG_REACT_JAVA_BRIDGE;
/**
* Default root view for catalyst apps. Provides the ability to listen for size changes so that a UI
* manager can re-layout its elements.
* It delegates handling touch events for itself and child views and sending those events to JS by
* using JSTouchDispatcher.
* This view is overriding {@link ViewGroup#onInterceptTouchEvent} method in order to be notified
* about the events for all of its children and it's also overriding
* {@link ViewGroup#requestDisallowInterceptTouchEvent} to make sure that
* {@link ViewGroup#onInterceptTouchEvent} will get events even when some child view start
* intercepting it. In case when no child view is interested in handling some particular
* touch event this view's {@link View#onTouchEvent} will still return true in order to be notified
* about all subsequent touch events related to that gesture (in case when JS code want to handle
* that gesture).
*/
public class ReactRootView extends SizeMonitoringFrameLayout implements RootView {
/**
* Listener interface for react root view events
*/
public interface ReactRootViewEventListener {
/**
* Called when the react context is attached to a ReactRootView.
*/
void onAttachedToReactInstance(ReactRootView rootView);
}
private @Nullable ReactInstanceManager mReactInstanceManager;
private @Nullable String mJSModuleName;
private @Nullable Bundle mAppProperties;
private @Nullable CustomGlobalLayoutListener mCustomGlobalLayoutListener;
private @Nullable ReactRootViewEventListener mRootViewEventListener;
private int mRootViewTag;
private boolean mIsAttachedToInstance;
private final JSTouchDispatcher mJSTouchDispatcher = new JSTouchDispatcher(this);
public ReactRootView(Context context) {
super(context);
}
public ReactRootView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ReactRootView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
Systrace.beginSection(TRACE_TAG_REACT_JAVA_BRIDGE, "ReactRootView.onMeasure");
try {
setMeasuredDimension(
MeasureSpec.getSize(widthMeasureSpec),
MeasureSpec.getSize(heightMeasureSpec));
// Check if we were waiting for onMeasure to attach the root view.
if (mReactInstanceManager != null && !mIsAttachedToInstance) {
attachToReactInstanceManager();
}
} finally {
Systrace.endSection(TRACE_TAG_REACT_JAVA_BRIDGE);
}
}
@Override
public void onChildStartedNativeGesture(MotionEvent androidEvent) {
if (mReactInstanceManager == null || !mIsAttachedToInstance ||
mReactInstanceManager.getCurrentReactContext() == null) {
FLog.w(
ReactConstants.TAG,
"Unable to dispatch touch to JS as the catalyst instance has not been attached");
return;
}
ReactContext reactContext = mReactInstanceManager.getCurrentReactContext();
EventDispatcher eventDispatcher = reactContext.getNativeModule(UIManagerModule.class)
.getEventDispatcher();
mJSTouchDispatcher.onChildStartedNativeGesture(androidEvent, eventDispatcher);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
dispatchJSTouchEvent(ev);
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
dispatchJSTouchEvent(ev);
super.onTouchEvent(ev);
// In case when there is no children interested in handling touch event, we return true from
// the root view in order to receive subsequent events related to that gesture
return true;
}
private void dispatchJSTouchEvent(MotionEvent event) {
if (mReactInstanceManager == null || !mIsAttachedToInstance ||
mReactInstanceManager.getCurrentReactContext() == null) {
FLog.w(
ReactConstants.TAG,
"Unable to dispatch touch to JS as the catalyst instance has not been attached");
return;
}
ReactContext reactContext = mReactInstanceManager.getCurrentReactContext();
EventDispatcher eventDispatcher = reactContext.getNativeModule(UIManagerModule.class)
.getEventDispatcher();
mJSTouchDispatcher.handleTouchEvent(event, eventDispatcher);
}
@Override
public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
// Override in order to still receive events to onInterceptTouchEvent even when some other
// views disallow that, but propagate it up the tree if possible.
if (getParent() != null) {
getParent().requestDisallowInterceptTouchEvent(disallowIntercept);
}
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
// No-op since UIManagerModule handles actually laying out children.
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
if (mIsAttachedToInstance) {
getViewTreeObserver().addOnGlobalLayoutListener(getCustomGlobalLayoutListener());
}
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
if (mIsAttachedToInstance) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
getViewTreeObserver().removeOnGlobalLayoutListener(getCustomGlobalLayoutListener());
} else {
getViewTreeObserver().removeGlobalOnLayoutListener(getCustomGlobalLayoutListener());
}
}
}
/**
* {@see #startReactApplication(ReactInstanceManager, String, android.os.Bundle)}
*/
public void startReactApplication(ReactInstanceManager reactInstanceManager, String moduleName) {
startReactApplication(reactInstanceManager, moduleName, null);
}
/**
* Schedule rendering of the react component rendered by the JS application from the given JS
* module (@{param moduleName}) using provided {@param reactInstanceManager} to attach to the
* JS context of that manager. Extra parameter {@param launchOptions} can be used to pass initial
* properties for the react component.
*/
public void startReactApplication(
ReactInstanceManager reactInstanceManager,
String moduleName,
@Nullable Bundle initialProperties) {
Systrace.beginSection(TRACE_TAG_REACT_JAVA_BRIDGE, "startReactApplication");
try {
UiThreadUtil.assertOnUiThread();
// TODO(6788889): Use POJO instead of bundle here, apparently we can't just use WritableMap
// here as it may be deallocated in native after passing via JNI bridge, but we want to reuse
// it in the case of re-creating the catalyst instance
Assertions.assertCondition(
mReactInstanceManager == null,
"This root view has already been attached to a catalyst instance manager");
mReactInstanceManager = reactInstanceManager;
mJSModuleName = moduleName;
mAppProperties = initialProperties;
if (!mReactInstanceManager.hasStartedCreatingInitialContext()) {
mReactInstanceManager.createReactContextInBackground();
}
attachToReactInstanceManager();
} finally {
Systrace.endSection(TRACE_TAG_REACT_JAVA_BRIDGE);
}
}
/**
* Unmount the react application at this root view, reclaiming any JS memory associated with that
* application. If {@link #startReactApplication} is called, this method must be called before the
* ReactRootView is garbage collected (typically in your Activity's onDestroy, or in your
* Fragment's onDestroyView).
*/
public void unmountReactApplication() {
if (mReactInstanceManager != null && mIsAttachedToInstance) {
mReactInstanceManager.detachRootView(this);
mIsAttachedToInstance = false;
}
}
public void onAttachedToReactInstance() {
if (mRootViewEventListener != null) {
mRootViewEventListener.onAttachedToReactInstance(this);
}
}
public void setEventListener(ReactRootViewEventListener eventListener) {
mRootViewEventListener = eventListener;
}
/* package */ String getJSModuleName() {
return Assertions.assertNotNull(mJSModuleName);
}
public @Nullable Bundle getAppProperties() {
return mAppProperties;
}
public void setAppProperties(@Nullable Bundle appProperties) {
UiThreadUtil.assertOnUiThread();
mAppProperties = appProperties;
runApplication();
}
/**
* Calls into JS to start the React application. Can be called multiple times with the
* same rootTag, which will re-render the application from the root.
*/
/* package */ void runApplication() {
Systrace.beginSection(TRACE_TAG_REACT_JAVA_BRIDGE, "ReactRootView.runApplication");
try {
if (mReactInstanceManager == null || !mIsAttachedToInstance) {
return;
}
ReactContext reactContext = mReactInstanceManager.getCurrentReactContext();
if (reactContext == null) {
return;
}
CatalystInstance catalystInstance = reactContext.getCatalystInstance();
WritableNativeMap appParams = new WritableNativeMap();
appParams.putDouble("rootTag", getRootViewTag());
@Nullable Bundle appProperties = getAppProperties();
if (appProperties != null) {
appParams.putMap("initialProps", Arguments.fromBundle(appProperties));
}
String jsAppModuleName = getJSModuleName();
catalystInstance.getJSModule(AppRegistry.class).runApplication(jsAppModuleName, appParams);
} finally {
Systrace.endSection(TRACE_TAG_REACT_JAVA_BRIDGE);
}
}
/**
* Is used by unit test to setup mIsAttachedToWindow flags, that will let this
* view to be properly attached to catalyst instance by startReactApplication call
*/
@VisibleForTesting
/* package */ void simulateAttachForTesting() {
mIsAttachedToInstance = true;
}
private CustomGlobalLayoutListener getCustomGlobalLayoutListener() {
if (mCustomGlobalLayoutListener == null) {
mCustomGlobalLayoutListener = new CustomGlobalLayoutListener();
}
return mCustomGlobalLayoutListener;
}
private void attachToReactInstanceManager() {
Systrace.beginSection(TRACE_TAG_REACT_JAVA_BRIDGE, "attachToReactInstanceManager");
try {
if (mIsAttachedToInstance) {
return;
}
mIsAttachedToInstance = true;
Assertions.assertNotNull(mReactInstanceManager).attachRootView(this);
getViewTreeObserver().addOnGlobalLayoutListener(getCustomGlobalLayoutListener());
} finally {
Systrace.endSection(TRACE_TAG_REACT_JAVA_BRIDGE);
}
}
@Override
protected void finalize() throws Throwable {
super.finalize();
Assertions.assertCondition(
!mIsAttachedToInstance,
"The application this ReactRootView was rendering was not unmounted before the " +
"ReactRootView was garbage collected. This usually means that your application is " +
"leaking large amounts of memory. To solve this, make sure to call " +
"ReactRootView#unmountReactApplication in the onDestroy() of your hosting Activity or in " +
"the onDestroyView() of your hosting Fragment.");
}
public int getRootViewTag() {
return mRootViewTag;
}
public void setRootViewTag(int rootViewTag) {
mRootViewTag = rootViewTag;
}
private class CustomGlobalLayoutListener implements ViewTreeObserver.OnGlobalLayoutListener {
private final Rect mVisibleViewArea;
private final int mMinKeyboardHeightDetected;
private int mKeyboardHeight = 0;
private int mDeviceRotation = 0;
private DisplayMetrics mWindowMetrics = new DisplayMetrics();
private DisplayMetrics mScreenMetrics = new DisplayMetrics();
/* package */ CustomGlobalLayoutListener() {
DisplayMetricsHolder.initDisplayMetricsIfNotInitialized(getContext().getApplicationContext());
mVisibleViewArea = new Rect();
mMinKeyboardHeightDetected = (int) PixelUtil.toPixelFromDIP(60);
}
@Override
public void onGlobalLayout() {
if (mReactInstanceManager == null || !mIsAttachedToInstance ||
mReactInstanceManager.getCurrentReactContext() == null) {
return;
}
checkForKeyboardEvents();
checkForDeviceOrientationChanges();
checkForDeviceDimensionsChanges();
}
private void checkForKeyboardEvents() {
getRootView().getWindowVisibleDisplayFrame(mVisibleViewArea);
final int heightDiff =
DisplayMetricsHolder.getWindowDisplayMetrics().heightPixels - mVisibleViewArea.bottom;
if (mKeyboardHeight != heightDiff && heightDiff > mMinKeyboardHeightDetected) {
// keyboard is now showing, or the keyboard height has changed
mKeyboardHeight = heightDiff;
WritableMap params = Arguments.createMap();
WritableMap coordinates = Arguments.createMap();
coordinates.putDouble("screenY", PixelUtil.toDIPFromPixel(mVisibleViewArea.bottom));
coordinates.putDouble("screenX", PixelUtil.toDIPFromPixel(mVisibleViewArea.left));
coordinates.putDouble("width", PixelUtil.toDIPFromPixel(mVisibleViewArea.width()));
coordinates.putDouble("height", PixelUtil.toDIPFromPixel(mKeyboardHeight));
params.putMap("endCoordinates", coordinates);
sendEvent("keyboardDidShow", params);
} else if (mKeyboardHeight != 0 && heightDiff <= mMinKeyboardHeightDetected) {
// keyboard is now hidden
mKeyboardHeight = 0;
sendEvent("keyboardDidHide", null);
}
}
private void checkForDeviceOrientationChanges() {
final int rotation =
((WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE))
.getDefaultDisplay().getRotation();
if (mDeviceRotation == rotation) {
return;
}
mDeviceRotation = rotation;
emitOrientationChanged(rotation);
}
private void checkForDeviceDimensionsChanges() {
// Get current display metrics.
DisplayMetricsHolder.initDisplayMetrics(getContext());
// Check changes to both window and screen display metrics since they may not update at the same time.
if (!areMetricsEqual(mWindowMetrics, DisplayMetricsHolder.getWindowDisplayMetrics())
|| !areMetricsEqual(mScreenMetrics, DisplayMetricsHolder.getScreenDisplayMetrics())) {
mWindowMetrics.setTo(DisplayMetricsHolder.getWindowDisplayMetrics());
mScreenMetrics.setTo(DisplayMetricsHolder.getScreenDisplayMetrics());
emitUpdateDimensionsEvent();
}
}
private boolean areMetricsEqual(DisplayMetrics displayMetrics, DisplayMetrics otherMetrics) {
if (Build.VERSION.SDK_INT >= 17) {
return displayMetrics.equals(otherMetrics);
} else {
// DisplayMetrics didn't have an equals method before API 17.
// Check all public fields manually.
return displayMetrics.widthPixels == otherMetrics.widthPixels
&& displayMetrics.heightPixels == otherMetrics.heightPixels
&& displayMetrics.density == otherMetrics.density
&& displayMetrics.densityDpi == otherMetrics.densityDpi
&& displayMetrics.scaledDensity == otherMetrics.scaledDensity
&& displayMetrics.xdpi == otherMetrics.xdpi
&& displayMetrics.ydpi == otherMetrics.ydpi;
}
}
private void emitOrientationChanged(final int newRotation) {
String name;
double rotationDegrees;
boolean isLandscape = false;
switch (newRotation) {
case Surface.ROTATION_0:
name = "portrait-primary";
rotationDegrees = 0.0;
break;
case Surface.ROTATION_90:
name = "landscape-primary";
rotationDegrees = -90.0;
isLandscape = true;
break;
case Surface.ROTATION_180:
name = "portrait-secondary";
rotationDegrees = 180.0;
break;
case Surface.ROTATION_270:
name = "landscape-secondary";
rotationDegrees = 90.0;
isLandscape = true;
break;
default:
return;
}
WritableMap map = Arguments.createMap();
map.putString("name", name);
map.putDouble("rotationDegrees", rotationDegrees);
map.putBoolean("isLandscape", isLandscape);
sendEvent("namedOrientationDidChange", map);
}
private void emitUpdateDimensionsEvent() {
mReactInstanceManager
.getCurrentReactContext()
.getNativeModule(DeviceInfoModule.class)
.emitUpdateDimensionsEvent();
}
private void sendEvent(String eventName, @Nullable WritableMap params) {
if (mReactInstanceManager != null) {
mReactInstanceManager.getCurrentReactContext()
.getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)
.emit(eventName, params);
}
}
}
}