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rOACCT/node_modules/@popperjs/core/lib/utils/computeOffsets.js.flow
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computeOffsets.js.flow
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// @flow
import getBasePlacement from './getBasePlacement';
import getVariation from './getVariation';
import getMainAxisFromPlacement from './getMainAxisFromPlacement';
import type {
Rect,
PositioningStrategy,
Offsets,
ClientRectObject,
} from '../types';
import { top, right, bottom, left, start, end, type Placement } from '../enums';
export default function computeOffsets({
reference,
element,
placement,
}: {
reference: Rect | ClientRectObject,
element: Rect | ClientRectObject,
strategy: PositioningStrategy,
placement?: Placement,
}): Offsets {
const basePlacement = placement ? getBasePlacement(placement) : null;
const variation = placement ? getVariation(placement) : null;
const commonX = reference.x + reference.width / 2 - element.width / 2;
const commonY = reference.y + reference.height / 2 - element.height / 2;
let offsets;
switch (basePlacement) {
case top:
offsets = {
x: commonX,
y: reference.y - element.height,
};
break;
case bottom:
offsets = {
x: commonX,
y: reference.y + reference.height,
};
break;
case right:
offsets = {
x: reference.x + reference.width,
y: commonY,
};
break;
case left:
offsets = {
x: reference.x - element.width,
y: commonY,
};
break;
default:
offsets = {
x: reference.x,
y: reference.y,
};
}
const mainAxis = basePlacement
? getMainAxisFromPlacement(basePlacement)
: null;
if (mainAxis != null) {
const len = mainAxis === 'y' ? 'height' : 'width';
switch (variation) {
case start:
offsets[mainAxis] =
offsets[mainAxis] - (reference[len] / 2 - element[len] / 2);
break;
case end:
offsets[mainAxis] =
offsets[mainAxis] + (reference[len] / 2 - element[len] / 2);
break;
default:
}
}
return offsets;
}
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