mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Samuel Susla
36b586ada1
Summary: Changelog: [Internal] Add support for dynamic font size. New class `ThreadStorage` is introduced, which is used to pass LayoutContext to `YogaLayoutableShadowNode::yogaNodeMeasureCallbackConnector`. ## Shortcoming This implementation doesn't cause re-render, if user changes font size and comes to the app without restarting it, it will show old font size. I believe this is fine for now as most people set their font size before they use the app and keep the same setting for a long time. Reviewed By: shergin Differential Revision: D22043728 fbshipit-source-id: 7453d165c280a2f4bcb73f4ee6daf9e64b637ded
67 lines
2.0 KiB
C++
67 lines
2.0 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 <vector>
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#include <react/core/LayoutableShadowNode.h>
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#include <react/graphics/Geometry.h>
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namespace facebook {
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namespace react {
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/*
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* LayoutContext: Additional contextual information useful for particular
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* layout approaches.
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*/
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struct LayoutContext {
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/*
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* Compound absolute position of the node relative to the root node.
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*/
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Point absolutePosition{0, 0};
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/*
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* Reflects the scale factor needed to convert from the logical coordinate
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* space into the device coordinate space of the physical screen.
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* Some layout systems *might* use this to round layout metric values
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* to `pixel value`.
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*/
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Float pointScaleFactor{1.0};
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/*
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* A raw pointer to list of raw pointers to `LayoutableShadowNode`s that were
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* affected by the re-layout pass. If the field is not `nullptr`, a particular
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* `LayoutableShadowNode` implementation should add mutated nodes to this
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* list. The order is not specified. Nothing in this collection is owing (on
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* purpose), make sure the memory is managed responsibly.
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*/
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std::vector<LayoutableShadowNode const *> *affectedNodes{};
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/*
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* Flag indicating whether in reassignment of direction
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* aware properties should take place. If yes, following
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* reassignment will occur in RTL context.
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* - (left|right) → (start|end)
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* - margin(Left|Right) → margin(Start|End)
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* - padding(Left|Right) → padding(Start|End)
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* - borderTop(Left|Right)Radius → borderTop(Start|End)Radius
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* - borderBottom(Left|Right)Radius → borderBottom(Start|End)Radius
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* - border(Left|Right)Width → border(Start|End)Width
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* - border(Left|Right)Color → border(Start|End)Color
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*/
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bool swapLeftAndRightInRTL{false};
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/*
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* Multiplier used to change size of the font in surface.
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*/
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Float fontSizeMultiplier{1.0};
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};
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} // namespace react
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} // namespace facebook
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