227 lines
6 KiB
Text
227 lines
6 KiB
Text
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// @flow
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import type {
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PositioningStrategy,
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Offsets,
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Modifier,
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ModifierArguments,
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Rect,
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Window,
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} from '../types';
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import { type BasePlacement, top, left, right, bottom } from '../enums';
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import getOffsetParent from '../dom-utils/getOffsetParent';
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import getWindow from '../dom-utils/getWindow';
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import getDocumentElement from '../dom-utils/getDocumentElement';
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import getComputedStyle from '../dom-utils/getComputedStyle';
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import getBasePlacement from '../utils/getBasePlacement';
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import { round } from '../utils/math';
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// eslint-disable-next-line import/no-unused-modules
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export type RoundOffsets = (
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offsets: $Shape<{ x: number, y: number, centerOffset: number }>
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) => Offsets;
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// eslint-disable-next-line import/no-unused-modules
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export type Options = {
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gpuAcceleration: boolean,
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adaptive: boolean,
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roundOffsets?: boolean | RoundOffsets,
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};
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const unsetSides = {
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top: 'auto',
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right: 'auto',
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bottom: 'auto',
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left: 'auto',
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};
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// Round the offsets to the nearest suitable subpixel based on the DPR.
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// Zooming can change the DPR, but it seems to report a value that will
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// cleanly divide the values into the appropriate subpixels.
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function roundOffsetsByDPR({ x, y }): Offsets {
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const win: Window = window;
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const dpr = win.devicePixelRatio || 1;
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return {
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x: round(round(x * dpr) / dpr) || 0,
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y: round(round(y * dpr) / dpr) || 0,
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};
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}
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export function mapToStyles({
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popper,
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popperRect,
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placement,
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offsets,
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position,
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gpuAcceleration,
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adaptive,
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roundOffsets,
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}: {
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popper: HTMLElement,
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popperRect: Rect,
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placement: BasePlacement,
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offsets: $Shape<{ x: number, y: number, centerOffset: number }>,
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position: PositioningStrategy,
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gpuAcceleration: boolean,
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adaptive: boolean,
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roundOffsets: boolean | RoundOffsets,
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}) {
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let { x = 0, y = 0 } =
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roundOffsets === true
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? roundOffsetsByDPR(offsets)
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: typeof roundOffsets === 'function'
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? roundOffsets(offsets)
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: offsets;
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const hasX = offsets.hasOwnProperty('x');
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const hasY = offsets.hasOwnProperty('y');
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let sideX: string = left;
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let sideY: string = top;
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const win: Window = window;
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if (adaptive) {
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let offsetParent = getOffsetParent(popper);
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let heightProp = 'clientHeight';
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let widthProp = 'clientWidth';
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if (offsetParent === getWindow(popper)) {
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offsetParent = getDocumentElement(popper);
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if (getComputedStyle(offsetParent).position !== 'static') {
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heightProp = 'scrollHeight';
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widthProp = 'scrollWidth';
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}
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}
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// $FlowFixMe[incompatible-cast]: force type refinement, we compare offsetParent with window above, but Flow doesn't detect it
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offsetParent = (offsetParent: Element);
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if (placement === top) {
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sideY = bottom;
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// $FlowFixMe[prop-missing]
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y -= offsetParent[heightProp] - popperRect.height;
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y *= gpuAcceleration ? 1 : -1;
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}
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if (placement === left) {
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sideX = right;
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// $FlowFixMe[prop-missing]
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x -= offsetParent[widthProp] - popperRect.width;
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x *= gpuAcceleration ? 1 : -1;
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}
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}
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const commonStyles = {
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position,
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...(adaptive && unsetSides),
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};
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if (gpuAcceleration) {
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return {
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...commonStyles,
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[sideY]: hasY ? '0' : '',
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[sideX]: hasX ? '0' : '',
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// Layer acceleration can disable subpixel rendering which causes slightly
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// blurry text on low PPI displays, so we want to use 2D transforms
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// instead
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transform:
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(win.devicePixelRatio || 1) < 2
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? `translate(${x}px, ${y}px)`
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: `translate3d(${x}px, ${y}px, 0)`,
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};
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}
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return {
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...commonStyles,
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[sideY]: hasY ? `${y}px` : '',
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[sideX]: hasX ? `${x}px` : '',
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transform: '',
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};
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}
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function computeStyles({ state, options }: ModifierArguments<Options>) {
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const {
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gpuAcceleration = true,
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adaptive = true,
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// defaults to use builtin `roundOffsetsByDPR`
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roundOffsets = true,
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} = options;
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if (false) {
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const transitionProperty =
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getComputedStyle(state.elements.popper).transitionProperty || '';
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if (
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adaptive &&
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['transform', 'top', 'right', 'bottom', 'left'].some(
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(property) => transitionProperty.indexOf(property) >= 0
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)
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) {
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console.warn(
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[
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'Popper: Detected CSS transitions on at least one of the following',
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'CSS properties: "transform", "top", "right", "bottom", "left".',
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'\n\n',
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'Disable the "computeStyles" modifier\'s `adaptive` option to allow',
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'for smooth transitions, or remove these properties from the CSS',
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'transition declaration on the popper element if only transitioning',
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'opacity or background-color for example.',
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'\n\n',
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'We recommend using the popper element as a wrapper around an inner',
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'element that can have any CSS property transitioned for animations.',
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].join(' ')
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);
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}
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}
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const commonStyles = {
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placement: getBasePlacement(state.placement),
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popper: state.elements.popper,
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popperRect: state.rects.popper,
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gpuAcceleration,
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};
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if (state.modifiersData.popperOffsets != null) {
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state.styles.popper = {
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...state.styles.popper,
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...mapToStyles({
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...commonStyles,
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offsets: state.modifiersData.popperOffsets,
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position: state.options.strategy,
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adaptive,
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roundOffsets,
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}),
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};
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}
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if (state.modifiersData.arrow != null) {
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state.styles.arrow = {
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...state.styles.arrow,
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...mapToStyles({
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...commonStyles,
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offsets: state.modifiersData.arrow,
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position: 'absolute',
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adaptive: false,
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roundOffsets,
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}),
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};
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}
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state.attributes.popper = {
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...state.attributes.popper,
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'data-popper-placement': state.placement,
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};
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}
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// eslint-disable-next-line import/no-unused-modules
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export type ComputeStylesModifier = Modifier<'computeStyles', Options>;
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export default ({
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name: 'computeStyles',
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enabled: true,
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phase: 'beforeWrite',
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fn: computeStyles,
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data: {},
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}: ComputeStylesModifier);
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