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