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Initialize getConstantsForViewManagers eagerly

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Summary: During the JS run, the view managers used on a React Native screen eventually call the native methods for `UIManagerModule.getConstantsForViewMangers(viewManagerName)`. This blocks the JS thread. This diff tries to cache the values of those calls and return them when JS needs it, ensuring that JS is not blocked as much.

Reviewed By: achen1

Differential Revision: D9985817

fbshipit-source-id: 36feabc8a386956f8a6474f6e7978285d31f24dd
This commit is contained in:
Ram N
2018-09-26 18:13:53 -07:00
committed by Facebook Github Bot
parent 99cacf4830
commit 62829a7a69
1 changed files with 172 additions and 170 deletions
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342
ReactAndroid/src/main/java/com/facebook/react/uimanager/UIManagerModule.java
View File

@@ -1,10 +1,9 @@
/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
* <p>This source code is licensed under the MIT license found in the LICENSE file in the root
* directory of this source tree.
*/
package com.facebook.react.uimanager;
import static com.facebook.react.bridge.ReactMarkerConstants.CREATE_UI_MANAGER_MODULE_CONSTANTS_END;
@@ -15,6 +14,7 @@ import android.content.ComponentCallbacks2;
import android.content.Context;
import android.content.res.Configuration;
import android.media.AudioManager;
import android.util.ArrayMap;
import com.facebook.common.logging.FLog;
import com.facebook.debug.holder.PrinterHolder;
import com.facebook.debug.tags.ReactDebugOverlayTags;
@@ -44,52 +44,52 @@ import com.facebook.react.uimanager.events.RCTEventEmitter;
import com.facebook.systrace.Systrace;
import com.facebook.systrace.SystraceMessage;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;
/**
* <p>Native module to allow JS to create and update native Views.</p>
* Native module to allow JS to create and update native Views.
*
* <p>
*
* <h2>== Transactional Requirement ==</h2>
*
* A requirement of this class is to make sure that transactional UI updates occur all at once,
* meaning that no intermediate state is ever rendered to the screen. For example, if a JS
* application update changes the background of View A to blue and the width of View B to 100, both
* need to appear at once. Practically, this means that all UI update code related to a single
* transaction must be executed as a single code block on the UI thread. Executing as multiple code
* blocks could allow the platform UI system to interrupt and render a partial UI state.
* </p>
*
* <p>To facilitate this, this module enqueues operations that are then applied to native view
* hierarchy through {@link NativeViewHierarchyManager} at the end of each transaction.
*
* <p>
* <h2>== CSSNodes ==</h2>
* In order to allow layout and measurement to occur on a non-UI thread, this module also
* operates on intermediate CSSNodeDEPRECATED objects that correspond to a native view. These CSSNodeDEPRECATED are able
* to calculate layout according to their styling rules, and then the resulting x/y/width/height of
* that layout is scheduled as an operation that will be applied to native view hierarchy at the end
* of current batch.
* </p>
*
* TODO(5241856): Investigate memory usage of creating many small objects in UIManageModule and
* consider implementing a pool
* TODO(5483063): Don't dispatch the view hierarchy at the end of a batch if no UI changes occurred
* <h2>== CSSNodes ==</h2>
*
* In order to allow layout and measurement to occur on a non-UI thread, this module also operates
* on intermediate CSSNodeDEPRECATED objects that correspond to a native view. These
* CSSNodeDEPRECATED are able to calculate layout according to their styling rules, and then the
* resulting x/y/width/height of that layout is scheduled as an operation that will be applied to
* native view hierarchy at the end of current batch. TODO(5241856): Investigate memory usage of
* creating many small objects in UIManageModule and consider implementing a pool TODO(5483063):
* Don't dispatch the view hierarchy at the end of a batch if no UI changes occurred
*/
@ReactModule(name = UIManagerModule.NAME)
public class UIManagerModule extends ReactContextBaseJavaModule implements
OnBatchCompleteListener, LifecycleEventListener, UIManager {
public class UIManagerModule extends ReactContextBaseJavaModule
implements OnBatchCompleteListener, LifecycleEventListener, UIManager {
/**
* Enables lazy discovery of a specific {@link ViewManager} by its name.
*/
/** Enables lazy discovery of a specific {@link ViewManager} by its name. */
public interface ViewManagerResolver {
/**
* {@class UIManagerModule} class uses this method to get a ViewManager by its name.
* This is the same name that comes from JS by {@code UIManager.ViewManagerName} call.
* {@class UIManagerModule} class uses this method to get a ViewManager by its name. This is the
* same name that comes from JS by {@code UIManager.ViewManagerName} call.
*/
@Nullable ViewManager getViewManager(String viewManagerName);
@Nullable
ViewManager getViewManager(String viewManagerName);
/**
* Provides a list of view manager names to register in JS as {@code UIManager.ViewManagerName}
@@ -97,14 +97,11 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
List<String> getViewManagerNames();
}
/**
* Resolves a name coming from native side to a name of the event that is exposed to JS.
*/
/** Resolves a name coming from native side to a name of the event that is exposed to JS. */
public interface CustomEventNamesResolver {
/**
* Returns custom event name by the provided event name.
*/
@Nullable String resolveCustomEventName(String eventName);
/** Returns custom event name by the provided event name. */
@Nullable
String resolveCustomEventName(String eventName);
}
public static final String NAME = "UIManager";
@@ -118,6 +115,8 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
private final UIImplementation mUIImplementation;
private final MemoryTrimCallback mMemoryTrimCallback = new MemoryTrimCallback();
private final List<UIManagerModuleListener> mListeners = new ArrayList<>();
private @Nullable Map<String, WritableMap> mViewManagerConstantsCache;
volatile private int mViewManagerConstantsCacheSize;
private int mBatchId = 0;
@@ -180,8 +179,7 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
public void initialize() {
getReactApplicationContext().registerComponentCallbacks(mMemoryTrimCallback);
mEventDispatcher.registerEventEmitter(
DEFAULT,
getReactApplicationContext().getJSModule(RCTEventEmitter.class));
DEFAULT, getReactApplicationContext().getJSModule(RCTEventEmitter.class));
}
@Override
@@ -212,10 +210,9 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
private static Map<String, Object> createConstants(ViewManagerResolver viewManagerResolver) {
ReactMarker.logMarker(CREATE_UI_MANAGER_MODULE_CONSTANTS_START);
SystraceMessage.beginSection(
Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, "CreateUIManagerConstants")
.arg("Lazy", true)
.flush();
SystraceMessage.beginSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, "CreateUIManagerConstants")
.arg("Lazy", true)
.flush();
try {
return UIManagerModuleConstantsHelper.createConstants(viewManagerResolver);
} finally {
@@ -229,10 +226,9 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
@Nullable Map<String, Object> customBubblingEvents,
@Nullable Map<String, Object> customDirectEvents) {
ReactMarker.logMarker(CREATE_UI_MANAGER_MODULE_CONSTANTS_START);
SystraceMessage.beginSection(
Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, "CreateUIManagerConstants")
.arg("Lazy", false)
.flush();
SystraceMessage.beginSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, "CreateUIManagerConstants")
.arg("Lazy", false)
.flush();
try {
return UIManagerModuleConstantsHelper.createConstants(
viewManagers, customBubblingEvents, customDirectEvents);
@@ -242,8 +238,48 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
}
}
/**
* Helper method to pre-compute the constants for a view manager. This method ensures that we
* don't block for getting the constants for view managers during TTI
*
* @param viewManagerNames
*/
@Deprecated
public void preComputeConstantsForViewManager(List<String> viewManagerNames) {
Map<String, WritableMap> constantsMap = new ArrayMap<>();
for (String viewManagerName : viewManagerNames) {
WritableMap constants = computeConstantsForViewManager(viewManagerName);
if (constants != null) {
constantsMap.put(viewManagerName, constants);
}
}
// To ensure that this is thread safe, we return an unmodifiableMap
// We use mViewManagerConstantsCacheSize to count the times we access the contents of the map
// Once we have accessed all the values, we free this cache
// Assumption is that JS gets the constants only once for each viewManager.
// Using this mechanism prevents expensive synchronized blocks, due to the nature of how this is
// accessed - write one, read multiple times, and then throw the data away.
mViewManagerConstantsCacheSize = viewManagerNames.size();
mViewManagerConstantsCache = Collections.unmodifiableMap(constantsMap);
}
@ReactMethod(isBlockingSynchronousMethod = true)
public @Nullable WritableMap getConstantsForViewManager(final String viewManagerName) {
if (mViewManagerConstantsCache != null
&& mViewManagerConstantsCache.containsKey(viewManagerName)) {
WritableMap constants = mViewManagerConstantsCache.get(viewManagerName);
if (--mViewManagerConstantsCacheSize <= 0) {
// Looks like we have read all the values from the cache, so we may as well free this cache
mViewManagerConstantsCache = null;
}
return constants;
} else {
return computeConstantsForViewManager(viewManagerName);
}
}
private @Nullable WritableMap computeConstantsForViewManager(final String viewManagerName) {
ViewManager targetView =
viewManagerName != null ? mUIImplementation.resolveViewManager(viewManagerName) : null;
if (targetView == null) {
@@ -310,29 +346,27 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
@Override
public <T extends SizeMonitoringFrameLayout & MeasureSpecProvider> int addRootView(
final T rootView) {
Systrace.beginSection(
Systrace.TRACE_TAG_REACT_JAVA_BRIDGE,
"UIManagerModule.addRootView");
Systrace.beginSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, "UIManagerModule.addRootView");
final int tag = ReactRootViewTagGenerator.getNextRootViewTag();
final ReactApplicationContext reactApplicationContext = getReactApplicationContext();
final ThemedReactContext themedRootContext =
new ThemedReactContext(reactApplicationContext, rootView.getContext());
new ThemedReactContext(reactApplicationContext, rootView.getContext());
mUIImplementation.registerRootView(rootView, tag, themedRootContext);
rootView.setOnSizeChangedListener(
new SizeMonitoringFrameLayout.OnSizeChangedListener() {
@Override
public void onSizeChanged(final int width, final int height, int oldW, int oldH) {
reactApplicationContext.runOnNativeModulesQueueThread(
new GuardedRunnable(reactApplicationContext) {
@Override
public void runGuarded() {
updateNodeSize(tag, width, height);
}
});
}
});
new SizeMonitoringFrameLayout.OnSizeChangedListener() {
@Override
public void onSizeChanged(final int width, final int height, int oldW, int oldH) {
reactApplicationContext.runOnNativeModulesQueueThread(
new GuardedRunnable(reactApplicationContext) {
@Override
public void runGuarded() {
updateNodeSize(tag, width, height);
}
});
}
});
Systrace.endSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE);
return tag;
@@ -350,13 +384,11 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
}
/**
* Sets local data for a shadow node corresponded with given tag.
* In some cases we need a way to specify some environmental data to shadow node
* to improve layout (or do something similar), so {@code localData} serves these needs.
* For example, any stateful embedded native views may benefit from this.
* Have in mind that this data is not supposed to interfere with the state of
* the shadow view.
* Please respect one-directional data flow of React.
* Sets local data for a shadow node corresponded with given tag. In some cases we need a way to
* specify some environmental data to shadow node to improve layout (or do something similar), so
* {@code localData} serves these needs. For example, any stateful embedded native views may
* benefit from this. Have in mind that this data is not supposed to interfere with the state of
* the shadow view. Please respect one-directional data flow of React.
*/
public void setViewLocalData(final int tag, final Object data) {
final ReactApplicationContext reactApplicationContext = getReactApplicationContext();
@@ -403,7 +435,7 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
* @param addChildTags a list of tags of views to add to the parent
* @param addAtIndices parallel to addChildTags, a list of indices to insert those children at
* @param removeFrom a list of indices of views to permanently remove. The memory for the
* corresponding views and data structures should be reclaimed.
* corresponding views and data structures should be reclaimed.
*/
@ReactMethod
public void manageChildren(
@@ -431,25 +463,18 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
PrinterHolder.getPrinter().logMessage(ReactDebugOverlayTags.UI_MANAGER, message);
}
mUIImplementation.manageChildren(
viewTag,
moveFrom,
moveTo,
addChildTags,
addAtIndices,
removeFrom);
viewTag, moveFrom, moveTo, addChildTags, addAtIndices, removeFrom);
}
/**
* Interface for fast tracking the initial adding of views. Children view tags are assumed to be
* Interface for fast tracking the initial adding of views. Children view tags are assumed to be
* in order
*
* @param viewTag the view tag of the parent view
* @param childrenTags An array of tags to add to the parent in order
*/
@ReactMethod
public void setChildren(
int viewTag,
ReadableArray childrenTags) {
public void setChildren(int viewTag, ReadableArray childrenTags) {
if (DEBUG) {
String message = "(UIManager.setChildren) tag: " + viewTag + ", children: " + childrenTags;
FLog.d(ReactConstants.TAG, message);
@@ -470,8 +495,8 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
/**
* Method which takes a container tag and then releases all subviews for that container upon
* receipt.
* TODO: The method name is incorrect and will be renamed, #6033872
* receipt. TODO: The method name is incorrect and will be renamed, #6033872
*
* @param containerTag the tag of the container for which the subviews must be removed
*/
@ReactMethod
@@ -490,7 +515,7 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
/**
* Determines the location on screen, width, and height of the given view relative to the device
* screen and returns the values via an async callback. This is the absolute position including
* screen and returns the values via an async callback. This is the absolute position including
* things like the status bar
*/
@ReactMethod
@@ -501,74 +526,61 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
/**
* Measures the view specified by tag relative to the given ancestorTag. This means that the
* returned x, y are relative to the origin x, y of the ancestor view. Results are stored in the
* given outputBuffer. We allow ancestor view and measured view to be the same, in which case
* the position always will be (0, 0) and method will only measure the view dimensions.
* given outputBuffer. We allow ancestor view and measured view to be the same, in which case the
* position always will be (0, 0) and method will only measure the view dimensions.
*
* NB: Unlike {@link #measure}, this will measure relative to the view layout, not the visible
* <p>NB: Unlike {@link #measure}, this will measure relative to the view layout, not the visible
* window which can cause unexpected results when measuring relative to things like ScrollViews
* that can have offset content on the screen.
*/
@ReactMethod
public void measureLayout(
int tag,
int ancestorTag,
Callback errorCallback,
Callback successCallback) {
int tag, int ancestorTag, Callback errorCallback, Callback successCallback) {
mUIImplementation.measureLayout(tag, ancestorTag, errorCallback, successCallback);
}
/**
* Like {@link #measure} and {@link #measureLayout} but measures relative to the immediate parent.
*
* NB: Unlike {@link #measure}, this will measure relative to the view layout, not the visible
* <p>NB: Unlike {@link #measure}, this will measure relative to the view layout, not the visible
* window which can cause unexpected results when measuring relative to things like ScrollViews
* that can have offset content on the screen.
*/
@ReactMethod
public void measureLayoutRelativeToParent(
int tag,
Callback errorCallback,
Callback successCallback) {
int tag, Callback errorCallback, Callback successCallback) {
mUIImplementation.measureLayoutRelativeToParent(tag, errorCallback, successCallback);
}
/**
* Find the touch target child native view in the supplied root view hierarchy, given a react
* Find the touch target child native view in the supplied root view hierarchy, given a react
* target location.
*
* This method is currently used only by Element Inspector DevTool.
* <p>This method is currently used only by Element Inspector DevTool.
*
* @param reactTag the tag of the root view to traverse
* @param point an array containing both X and Y target location
* @param callback will be called if with the identified child view react ID, and measurement
* info. If no view was found, callback will be invoked with no data.
* info. If no view was found, callback will be invoked with no data.
*/
@ReactMethod
public void findSubviewIn(
final int reactTag,
final ReadableArray point,
final Callback callback) {
final int reactTag, final ReadableArray point, final Callback callback) {
mUIImplementation.findSubviewIn(
reactTag,
Math.round(PixelUtil.toPixelFromDIP(point.getDouble(0))),
Math.round(PixelUtil.toPixelFromDIP(point.getDouble(1))),
callback);
reactTag,
Math.round(PixelUtil.toPixelFromDIP(point.getDouble(0))),
Math.round(PixelUtil.toPixelFromDIP(point.getDouble(1))),
callback);
}
/**
* Check if the first shadow node is the descendant of the second shadow node
*/
/** Check if the first shadow node is the descendant of the second shadow node */
@ReactMethod
public void viewIsDescendantOf(
final int reactTag,
final int ancestorReactTag,
final Callback callback) {
final int reactTag, final int ancestorReactTag, final Callback callback) {
mUIImplementation.viewIsDescendantOf(reactTag, ancestorReactTag, callback);
}
/**
* Registers a new Animation that can then be added to a View using {@link #addAnimation}.
*/
/** Registers a new Animation that can then be added to a View using {@link #addAnimation}. */
public void registerAnimation(Animation animation) {
mUIImplementation.registerAnimation(animation);
}
@@ -580,9 +592,7 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
mUIImplementation.addAnimation(reactTag, animationID, onSuccess);
}
/**
* Removes an existing Animation, canceling it if it was in progress.
*/
/** Removes an existing Animation, canceling it if it was in progress. */
public void removeAnimation(int reactTag, int animationID) {
mUIImplementation.removeAnimation(reactTag, animationID);
}
@@ -600,11 +610,12 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
}
@ReactMethod
public void dispatchViewManagerCommand(int reactTag, int commandId, @Nullable ReadableArray commandArgs) {
//TODO: this is a temporary approach to support ViewManagerCommands in Fabric until
public void dispatchViewManagerCommand(
int reactTag, int commandId, @Nullable ReadableArray commandArgs) {
// TODO: this is a temporary approach to support ViewManagerCommands in Fabric until
// the dispatchViewManagerCommand() method is supported by Fabric JS API.
UIManagerHelper.getUIManager(getReactApplicationContext(), ViewUtil.getUIManagerType(reactTag))
.dispatchCommand(reactTag, commandId, commandArgs);
.dispatchCommand(reactTag, commandId, commandArgs);
}
@Override
@@ -614,7 +625,8 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
@ReactMethod
public void playTouchSound() {
AudioManager audioManager = (AudioManager) getReactApplicationContext().getSystemService(Context.AUDIO_SERVICE);
AudioManager audioManager =
(AudioManager) getReactApplicationContext().getSystemService(Context.AUDIO_SERVICE);
if (audioManager != null) {
audioManager.playSoundEffect(AudioManager.FX_KEY_CLICK);
}
@@ -624,11 +636,11 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
* Show a PopupMenu.
*
* @param reactTag the tag of the anchor view (the PopupMenu is displayed next to this view); this
* needs to be the tag of a native view (shadow views can not be anchors)
* needs to be the tag of a native view (shadow views can not be anchors)
* @param items the menu items as an array of strings
* @param error will be called if there is an error displaying the menu
* @param success will be called with the position of the selected item as the first argument, or
* no arguments if the menu is dismissed
* no arguments if the menu is dismissed
*/
@ReactMethod
public void showPopupMenu(int reactTag, ReadableArray items, Callback error, Callback success) {
@@ -644,10 +656,10 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
* LayoutAnimation API on Android is currently experimental. Therefore, it needs to be enabled
* explicitly in order to avoid regression in existing application written for iOS using this API.
*
* Warning : This method will be removed in future version of React Native, and layout animation
* will be enabled by default, so always check for its existence before invoking it.
* <p>Warning : This method will be removed in future version of React Native, and layout
* animation will be enabled by default, so always check for its existence before invoking it.
*
* TODO(9139831) : remove this method once layout animation is fully stable.
* <p>TODO(9139831) : remove this method once layout animation is fully stable.
*
* @param enabled whether layout animation is enabled or not
*/
@@ -657,38 +669,35 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
}
/**
* Configure an animation to be used for the native layout changes, and native views
* creation. The animation will only apply during the current batch operations.
* Configure an animation to be used for the native layout changes, and native views creation. The
* animation will only apply during the current batch operations.
*
* TODO(7728153) : animating view deletion is currently not supported.
* TODO(7613721) : callbacks are not supported, this feature will likely be killed.
* <p>TODO(7728153) : animating view deletion is currently not supported. TODO(7613721) :
* callbacks are not supported, this feature will likely be killed.
*
* @param config the configuration of the animation for view addition/removal/update.
* @param success will be called when the animation completes, or when the animation get
* interrupted. In this case, callback parameter will be false.
* interrupted. In this case, callback parameter will be false.
* @param error will be called if there was an error processing the animation
*/
@ReactMethod
public void configureNextLayoutAnimation(
ReadableMap config,
Callback success,
Callback error) {
public void configureNextLayoutAnimation(ReadableMap config, Callback success, Callback error) {
mUIImplementation.configureNextLayoutAnimation(config, success, error);
}
/**
* To implement the transactional requirement mentioned in the class javadoc, we only commit
* UI changes to the actual view hierarchy once a batch of JS->Java calls have been completed.
* We know this is safe because all JS->Java calls that are triggered by a Java->JS call (e.g.
* the delivery of a touch event or execution of 'renderApplication') end up in a single
* JS->Java transaction.
* To implement the transactional requirement mentioned in the class javadoc, we only commit UI
* changes to the actual view hierarchy once a batch of JS->Java calls have been completed. We
* know this is safe because all JS->Java calls that are triggered by a Java->JS call (e.g. the
* delivery of a touch event or execution of 'renderApplication') end up in a single JS->Java
* transaction.
*
* A better way to do this would be to have JS explicitly signal to this module when a UI
* transaction is done. Right now, though, this is how iOS does it, and we should probably
* update the JS and native code and make this change at the same time.
* <p>A better way to do this would be to have JS explicitly signal to this module when a UI
* transaction is done. Right now, though, this is how iOS does it, and we should probably update
* the JS and native code and make this change at the same time.
*
* TODO(5279396): Make JS UI library explicitly notify the native UI module of the end of a UI
* transaction using a standard native call
* <p>TODO(5279396): Make JS UI library explicitly notify the native UI module of the end of a UI
* transaction using a standard native call
*/
@Override
public void onBatchComplete() {
@@ -696,8 +705,8 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
mBatchId++;
SystraceMessage.beginSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, "onBatchCompleteUI")
.arg("BatchId", batchId)
.flush();
.arg("BatchId", batchId)
.flush();
for (UIManagerModuleListener listener : mListeners) {
listener.willDispatchViewUpdates(this);
}
@@ -723,28 +732,23 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
}
/**
* Schedule a block to be executed on the UI thread. Useful if you need to execute
* view logic after all currently queued view updates have completed.
* Schedule a block to be executed on the UI thread. Useful if you need to execute view logic
* after all currently queued view updates have completed.
*
* @param block that contains UI logic you want to execute.
*
* Usage Example:
UIManagerModule uiManager = reactContext.getNativeModule(UIManagerModule.class);
uiManager.addUIBlock(new UIBlock() {
public void execute (NativeViewHierarchyManager nvhm) {
View view = nvhm.resolveView(tag);
// ...execute your code on View (e.g. snapshot the view)
}
});
*/
* <p>Usage Example:
* <p>UIManagerModule uiManager = reactContext.getNativeModule(UIManagerModule.class);
* uiManager.addUIBlock(new UIBlock() { public void execute (NativeViewHierarchyManager nvhm)
* { View view = nvhm.resolveView(tag); // ...execute your code on View (e.g. snapshot the
* view) } });
*/
public void addUIBlock(UIBlock block) {
mUIImplementation.addUIBlock(block);
}
/**
* Schedule a block to be executed on the UI thread. Useful if you need to execute
* view logic before all currently queued view updates have completed.
* Schedule a block to be executed on the UI thread. Useful if you need to execute view logic
* before all currently queued view updates have completed.
*
* @param block that contains UI logic you want to execute.
*/
@@ -761,12 +765,10 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
}
/**
* Given a reactTag from a component, find its root node tag, if possible.
* Otherwise, this will return 0. If the reactTag belongs to a root node, this
* will return the same reactTag.
* Given a reactTag from a component, find its root node tag, if possible. Otherwise, this will
* return 0. If the reactTag belongs to a root node, this will return the same reactTag.
*
* @param reactTag the component tag
*
* @return the rootTag
*/
public int resolveRootTagFromReactTag(int reactTag) {
@@ -790,15 +792,17 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
* Updates the styles of the {@link ReactShadowNode} based on the Measure specs received by
* parameters.
*/
public void updateRootLayoutSpecs(final int rootViewTag, final int widthMeasureSpec, final int heightMeasureSpec) {
public void updateRootLayoutSpecs(
final int rootViewTag, final int widthMeasureSpec, final int heightMeasureSpec) {
ReactApplicationContext reactApplicationContext = getReactApplicationContext();
reactApplicationContext.runOnNativeModulesQueueThread(
new GuardedRunnable(reactApplicationContext) {
@Override
public void runGuarded() {
mUIImplementation.updateRootView(rootViewTag, widthMeasureSpec, heightMeasureSpec);
mUIImplementation.dispatchViewUpdates(-1);
}});
new GuardedRunnable(reactApplicationContext) {
@Override
public void runGuarded() {
mUIImplementation.updateRootView(rootViewTag, widthMeasureSpec, heightMeasureSpec);
mUIImplementation.dispatchViewUpdates(-1);
}
});
}
/** Listener that drops the CSSNode pool on low memory when the app is backgrounded. */
@@ -812,11 +816,9 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
}
public void onConfigurationChanged(Configuration newConfig) {}
@Override
public void onLowMemory() {
}
public void onLowMemory() {}
}
}