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CodemodService FBSourceClangFormatLinterBot
8ca8f0cbe3
Reviewed By: zertosh Differential Revision: D29095479 fbshipit-source-id: a640a3c29125fb906e4c0b07dc60064249622185
64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its 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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#pragma once
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#include "ViewProps.h"
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#include <react/debug/react_native_assert.h>
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namespace facebook {
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namespace react {
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/**
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* Given animation progress, old props, new props, and an "interpolated" shared
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* props struct, this will mutate the "interpolated" struct in-place to give it
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* values interpolated between the old and new props.
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*/
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static inline void interpolateViewProps(
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Float animationProgress,
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const SharedProps &oldPropsShared,
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const SharedProps &newPropsShared,
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SharedProps &interpolatedPropsShared) {
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// Verify the static_casts below are safe
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react_native_assert(
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dynamic_cast<ViewProps const *>(oldPropsShared.get()) != nullptr &&
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dynamic_cast<ViewProps const *>(newPropsShared.get()) != nullptr &&
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dynamic_cast<ViewProps const *>(interpolatedPropsShared.get()) !=
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nullptr);
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ViewProps const *oldViewProps =
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static_cast<ViewProps const *>(oldPropsShared.get());
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ViewProps const *newViewProps =
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static_cast<ViewProps const *>(newPropsShared.get());
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ViewProps *interpolatedProps = const_cast<ViewProps *>(
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static_cast<ViewProps const *>(interpolatedPropsShared.get()));
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interpolatedProps->opacity = oldViewProps->opacity +
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(newViewProps->opacity - oldViewProps->opacity) * animationProgress;
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interpolatedProps->transform = Transform::Interpolate(
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animationProgress, oldViewProps->transform, newViewProps->transform);
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// Android uses RawProps, not props, to update props on the platform...
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// Since interpolated props don't interpolate at all using RawProps, we need
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// to "re-hydrate" raw props after interpolating. This is what actually gets
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// sent to the mounting layer. This is a temporary hack, only for platforms
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// that use RawProps/folly::dynamic instead of concrete props on the
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// mounting layer. Once we can remove this, we should change `rawProps` to
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// be const again.
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#ifdef ANDROID
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interpolatedProps->rawProps["opacity"] = interpolatedProps->opacity;
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interpolatedProps->rawProps["transform"] =
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(folly::dynamic)interpolatedProps->transform;
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#endif
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}
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} // namespace react
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} // namespace facebook
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