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3434ff4f4b
This adds `experimental_scrollIntoView(alignToTop)`. It doesn't yet
support `scrollIntoView(options)`.
Cases:
- No host children: Without host children, we represent the virtual
space of the Fragment by attempting to scroll to the nearest edge by
using its siblings. If the preferred sibling is not found, we'll try the
other side, and then the parent.
- 1 or more host children: In order to handle the case of children
spread between multiple scroll containers, we scroll to each child in
reverse order based on the `alignToTop` flag.
Due to the complexity of multiple scroll containers and dealing with
portals, I've added this under a separate feature flag with an
experimental prefix. We may stabilize it along with the other APIs, but
this allows us to not block the whole feature on it.
This PR was previously implementing a much more complex approach to
handling multiple scroll containers and portals. We're going to start
with the simple loop and see if we can find any concrete use cases where
that doesn't suffice. 01f31d4301 is the
diff between approaches here.
89 lines
4.1 KiB
JavaScript
89 lines
4.1 KiB
JavaScript
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow
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*/
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import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
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import typeof * as ExportsType from './ReactFeatureFlags.native-fb';
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import typeof * as DynamicExportsType from './ReactFeatureFlags.native-fb-dynamic';
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// Re-export dynamic flags from the internal module.
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// Intentionally using * because this import is compiled to a `require` call.
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import * as dynamicFlagsUntyped from 'ReactNativeInternalFeatureFlags';
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const dynamicFlags: DynamicExportsType = (dynamicFlagsUntyped: any);
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// We destructure each value before re-exporting to avoid a dynamic look-up on
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// the exports object every time a flag is read.
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export const {
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alwaysThrottleRetries,
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enableHiddenSubtreeInsertionEffectCleanup,
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enableObjectFiber,
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enablePersistedModeClonedFlag,
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enableEagerAlternateStateNodeCleanup,
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passChildrenWhenCloningPersistedNodes,
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renameElementSymbol,
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enableFragmentRefs,
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enableFragmentRefsScrollIntoView,
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} = dynamicFlags;
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// The rest of the flags are static for better dead code elimination.
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export const disableClientCache: boolean = true;
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export const disableCommentsAsDOMContainers: boolean = true;
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export const disableInputAttributeSyncing: boolean = false;
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export const disableLegacyContext: boolean = false;
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export const disableLegacyContextForFunctionComponents: boolean = false;
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export const disableLegacyMode: boolean = false;
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export const disableSchedulerTimeoutInWorkLoop: boolean = false;
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export const disableTextareaChildren: boolean = false;
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export const enableAsyncDebugInfo: boolean = false;
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export const enableAsyncIterableChildren: boolean = false;
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export const enableCPUSuspense: boolean = true;
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export const enableCreateEventHandleAPI: boolean = false;
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export const enableMoveBefore: boolean = true;
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export const enableFizzExternalRuntime: boolean = true;
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export const enableHalt: boolean = false;
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export const enableInfiniteRenderLoopDetection: boolean = false;
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export const enableLegacyCache: boolean = false;
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export const enableLegacyFBSupport: boolean = false;
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export const enableLegacyHidden: boolean = false;
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export const enableNoCloningMemoCache: boolean = false;
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export const enablePostpone: boolean = false;
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export const enableProfilerCommitHooks: boolean = __PROFILE__;
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export const enableProfilerNestedUpdatePhase: boolean = __PROFILE__;
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export const enableProfilerTimer: boolean = __PROFILE__;
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export const enableReactTestRendererWarning: boolean = false;
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export const enableRetryLaneExpiration: boolean = false;
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export const enableSchedulingProfiler: boolean = __PROFILE__;
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export const enableScopeAPI: boolean = false;
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export const enableSuspenseAvoidThisFallback: boolean = false;
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export const enableSuspenseCallback: boolean = true;
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export const enableTaint: boolean = true;
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export const enableTransitionTracing: boolean = false;
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export const enableTrustedTypesIntegration: boolean = false;
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export const enableUpdaterTracking: boolean = __PROFILE__;
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export const enableUseEffectEventHook: boolean = false;
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export const retryLaneExpirationMs = 5000;
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export const syncLaneExpirationMs = 250;
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export const transitionLaneExpirationMs = 5000;
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export const enableHydrationLaneScheduling: boolean = true;
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export const enableYieldingBeforePassive: boolean = false;
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export const enableThrottledScheduling: boolean = false;
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export const enableViewTransition: boolean = false;
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export const enableGestureTransition: boolean = false;
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export const enableScrollEndPolyfill: boolean = true;
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export const enableSuspenseyImages: boolean = false;
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export const enableFizzBlockingRender: boolean = true;
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export const enableSrcObject: boolean = false;
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export const enableHydrationChangeEvent: boolean = true;
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export const enableDefaultTransitionIndicator: boolean = false;
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export const ownerStackLimit = 1e4;
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export const enableComponentPerformanceTrack: boolean =
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__PROFILE__ && dynamicFlags.enableComponentPerformanceTrack;
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// Flow magic to verify the exports of this file match the original version.
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((((null: any): ExportsType): FeatureFlagsType): ExportsType);
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