139 строки
3.7 KiB
JavaScript
139 строки
3.7 KiB
JavaScript
/**
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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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* @format
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* @flow strict-local
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*/
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'use strict';
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const BorderBox = require('./BorderBox');
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const Dimensions = require('../Utilities/Dimensions');
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const React = require('react');
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const StyleSheet = require('../StyleSheet/StyleSheet');
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const View = require('../Components/View/View');
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const flattenStyle = require('../StyleSheet/flattenStyle');
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const resolveBoxStyle = require('./resolveBoxStyle');
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class ElementBox extends React.Component<$FlowFixMeProps> {
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render(): React.Node {
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const style = flattenStyle(this.props.style) || {};
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let margin = resolveBoxStyle('margin', style);
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let padding = resolveBoxStyle('padding', style);
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const frameStyle = {...this.props.frame};
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const contentStyle = {
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width: this.props.frame.width,
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height: this.props.frame.height,
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};
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if (margin != null) {
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margin = resolveRelativeSizes(margin);
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frameStyle.top -= margin.top;
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frameStyle.left -= margin.left;
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frameStyle.height += margin.top + margin.bottom;
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frameStyle.width += margin.left + margin.right;
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if (margin.top < 0) {
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contentStyle.height += margin.top;
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}
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if (margin.bottom < 0) {
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contentStyle.height += margin.bottom;
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}
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if (margin.left < 0) {
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contentStyle.width += margin.left;
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}
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if (margin.right < 0) {
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contentStyle.width += margin.right;
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}
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}
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if (padding != null) {
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padding = resolveRelativeSizes(padding);
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contentStyle.width -= padding.left + padding.right;
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contentStyle.height -= padding.top + padding.bottom;
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}
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return (
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<View style={[styles.frame, frameStyle]} pointerEvents="none">
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<BorderBox box={margin} style={styles.margin}>
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<BorderBox box={padding} style={styles.padding}>
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<View style={[styles.content, contentStyle]} />
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</BorderBox>
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</BorderBox>
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</View>
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);
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}
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}
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const styles = StyleSheet.create({
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frame: {
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position: 'absolute',
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},
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content: {
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backgroundColor: 'rgba(200, 230, 255, 0.8)', // blue
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},
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padding: {
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borderColor: 'rgba(77, 255, 0, 0.3)', // green
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},
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margin: {
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borderColor: 'rgba(255, 132, 0, 0.3)', // orange
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},
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});
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type Style = {
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top: number,
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right: number,
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bottom: number,
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left: number,
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...
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};
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/**
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* Resolves relative sizes (percentages and auto) in a style object.
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*
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* @param style the style to resolve
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* @return a modified copy
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*/
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function resolveRelativeSizes(style: $ReadOnly<Style>): Style {
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let resolvedStyle = Object.assign({}, style);
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resolveSizeInPlace(resolvedStyle, 'top', 'height');
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resolveSizeInPlace(resolvedStyle, 'right', 'width');
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resolveSizeInPlace(resolvedStyle, 'bottom', 'height');
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resolveSizeInPlace(resolvedStyle, 'left', 'width');
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return resolvedStyle;
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}
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/**
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* Resolves the given size of a style object in place.
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*
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* @param style the style object to modify
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* @param direction the direction to resolve (e.g. 'top')
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* @param dimension the window dimension that this direction belongs to (e.g. 'height')
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*/
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function resolveSizeInPlace(
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style: Style,
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direction: string,
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dimension: string,
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) {
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if (style[direction] !== null && typeof style[direction] === 'string') {
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if (style[direction].indexOf('%') !== -1) {
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style[direction] =
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(parseFloat(style[direction]) / 100.0) *
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Dimensions.get('window')[dimension];
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}
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if (style[direction] === 'auto') {
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// Ignore auto sizing in frame drawing due to complexity of correctly rendering this
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style[direction] = 0;
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}
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}
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}
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module.exports = ElementBox;
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