124 lines
4.1 KiB
C++
124 lines
4.1 KiB
C++
/*
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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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#pragma once
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#include <glog/logging.h>
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#include <cstddef>
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#include <react/renderer/attributedstring/AttributedStringBox.h>
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#include <react/renderer/attributedstring/ParagraphAttributes.h>
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#include <react/renderer/graphics/Size.h>
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#include <react/renderer/textlayoutmanager/TextLayoutManager.h>
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#include <react/renderer/textlayoutmanager/TextMeasureCache.h>
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namespace facebook::react {
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template <typename TextLayoutManagerT>
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concept TextLayoutManagerWithPreparedLayout = requires(
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TextLayoutManagerT textLayoutManager,
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AttributedString attributedString,
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ParagraphAttributes paragraphAttributes,
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TextLayoutContext layoutContext,
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LayoutConstraints layoutConstraints,
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typename TextLayoutManagerT::PreparedLayout preparedLayout) {
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sizeof(typename TextLayoutManagerT::PreparedLayout);
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{
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textLayoutManager.prepareLayout(attributedString, paragraphAttributes, layoutContext, layoutConstraints)
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} -> std::same_as<typename TextLayoutManagerT::PreparedLayout>;
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{
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textLayoutManager.measurePreparedLayout(preparedLayout, layoutContext, layoutConstraints)
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} -> std::same_as<TextMeasurement>;
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};
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namespace detail {
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template <typename T>
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struct PreparedLayoutT {
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using type = std::nullptr_t;
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};
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template <TextLayoutManagerWithPreparedLayout T>
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struct PreparedLayoutT<T> {
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using type = typename T::PreparedLayout;
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};
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/**
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* TextLayoutManagerExtended acts as an adapter for TextLayoutManager methods
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* which may not exist for a specific platform. Callers can check at
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* compile-time whether a method is supported, and calling if it is not will
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* terminate.
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*/
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template <typename TextLayoutManagerT>
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class TextLayoutManagerExtended {
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public:
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static constexpr bool supportsLineMeasurement()
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{
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return requires(TextLayoutManagerT textLayoutManager) {
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{
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textLayoutManager.measureLines(AttributedStringBox{}, ParagraphAttributes{}, Size{})
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} -> std::same_as<LinesMeasurements>;
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};
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}
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static constexpr bool supportsPreparedLayout()
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{
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return TextLayoutManagerWithPreparedLayout<TextLayoutManagerT>;
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}
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using PreparedLayout = typename PreparedLayoutT<TextLayoutManagerT>::type;
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TextLayoutManagerExtended(const TextLayoutManagerT &textLayoutManager) : textLayoutManager_(textLayoutManager) {}
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LinesMeasurements measureLines(
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const AttributedStringBox &attributedStringBox,
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const ParagraphAttributes ¶graphAttributes,
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const Size &size)
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{
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if constexpr (supportsLineMeasurement()) {
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return textLayoutManager_.measureLines(attributedStringBox, paragraphAttributes, size);
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}
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LOG(FATAL) << "Platform TextLayoutManager does not support measureLines";
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}
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PreparedLayout prepareLayout(
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const AttributedString &attributedString,
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const ParagraphAttributes ¶graphAttributes,
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const TextLayoutContext &layoutContext,
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const LayoutConstraints &layoutConstraints) const
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{
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if constexpr (supportsPreparedLayout()) {
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return textLayoutManager_.prepareLayout(attributedString, paragraphAttributes, layoutContext, layoutConstraints);
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}
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LOG(FATAL) << "Platform TextLayoutManager does not support prepareLayout";
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}
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TextMeasurement measurePreparedLayout(
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const PreparedLayout &layout,
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const TextLayoutContext &layoutContext,
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const LayoutConstraints &layoutConstraints) const
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{
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if constexpr (supportsPreparedLayout()) {
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return textLayoutManager_.measurePreparedLayout(layout, layoutContext, layoutConstraints);
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}
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LOG(FATAL) << "Platform TextLayoutManager does not support measurePreparedLayout";
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}
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private:
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const TextLayoutManagerT &textLayoutManager_;
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};
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} // namespace detail
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using TextLayoutManagerExtended = detail::TextLayoutManagerExtended<TextLayoutManager>;
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struct MeasuredPreparedLayout {
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LayoutConstraints layoutConstraints;
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TextMeasurement measurement;
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TextLayoutManagerExtended::PreparedLayout preparedLayout{};
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};
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} // namespace facebook::react
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