49 lines
1.2 KiB
C++
49 lines
1.2 KiB
C++
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/*
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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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#include "ScrollViewShadowNode.h"
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#include <react/core/LayoutMetrics.h>
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namespace facebook {
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namespace react {
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const char ScrollViewComponentName[] = "ScrollView";
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void ScrollViewShadowNode::updateStateIfNeeded() {
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ensureUnsealed();
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auto contentBoundingRect = Rect{};
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for (const auto &childNode : getLayoutableChildNodes()) {
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contentBoundingRect.unionInPlace(childNode->getLayoutMetrics().frame);
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}
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auto state = getStateData();
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if (state.contentBoundingRect != contentBoundingRect) {
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state.contentBoundingRect = contentBoundingRect;
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setStateData(std::move(state));
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}
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}
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#pragma mark - LayoutableShadowNode
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void ScrollViewShadowNode::layout(LayoutContext layoutContext) {
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ConcreteViewShadowNode::layout(layoutContext);
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updateStateIfNeeded();
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}
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Transform ScrollViewShadowNode::getTransform() const {
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auto transform = ConcreteViewShadowNode::getTransform();
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auto contentOffset = getStateData().contentOffset;
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return transform *
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Transform::Translate(-contentOffset.x, -contentOffset.y, 0);
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}
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} // namespace react
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} // namespace facebook
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