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import getSupportedPropertyName from '../utils/getSupportedPropertyName';
import find from '../utils/find';
import getOffsetParent from '../utils/getOffsetParent';
import getBoundingClientRect from '../utils/getBoundingClientRect';
import getRoundedOffsets from '../utils/getRoundedOffsets';
import isBrowser from '../utils/isBrowser';
const isFirefox = isBrowser && /Firefox/i.test(navigator.userAgent);
/**
* @function
* @memberof Modifiers
* @argument {Object} data - The data object generated by `update` method
* @argument {Object} options - Modifiers configuration and options
* @returns {Object} The data object, properly modified
*/
export default function computeStyle(data, options) {
const { x, y } = options;
const { popper } = data.offsets;
// Remove this legacy support in Popper.js v2
const legacyGpuAccelerationOption = find(
data.instance.modifiers,
modifier => modifier.name === 'applyStyle'
).gpuAcceleration;
if (legacyGpuAccelerationOption !== undefined) {
console.warn(
'WARNING: `gpuAcceleration` option moved to `computeStyle` modifier and will not be supported in future versions of Popper.js!'
);
}
const gpuAcceleration =
legacyGpuAccelerationOption !== undefined
? legacyGpuAccelerationOption
: options.gpuAcceleration;
const offsetParent = getOffsetParent(data.instance.popper);
const offsetParentRect = getBoundingClientRect(offsetParent);
// Styles
const styles = {
position: popper.position,
};
const offsets = getRoundedOffsets(
data,
window.devicePixelRatio < 2 || !isFirefox
);
const sideA = x === 'bottom' ? 'top' : 'bottom';
const sideB = y === 'right' ? 'left' : 'right';
// if gpuAcceleration is set to `true` and transform is supported,
// we use `translate3d` to apply the position to the popper we
// automatically use the supported prefixed version if needed
const prefixedProperty = getSupportedPropertyName('transform');
// now, let's make a step back and look at this code closely (wtf?)
// If the content of the popper grows once it's been positioned, it
// may happen that the popper gets misplaced because of the new content
// overflowing its reference element
// To avoid this problem, we provide two options (x and y), which allow
// the consumer to define the offset origin.
// If we position a popper on top of a reference element, we can set
// `x` to `top` to make the popper grow towards its top instead of
// its bottom.
let left, top;
if (sideA === 'bottom') {
// when offsetParent is <html> the positioning is relative to the bottom of the screen (excluding the scrollbar)
// and not the bottom of the html element
if (offsetParent.nodeName === 'HTML') {
top = -offsetParent.clientHeight + offsets.bottom;
} else {
top = -offsetParentRect.height + offsets.bottom;
}
} else {
top = offsets.top;
}
if (sideB === 'right') {
if (offsetParent.nodeName === 'HTML') {
left = -offsetParent.clientWidth + offsets.right;
} else {
left = -offsetParentRect.width + offsets.right;
}
} else {
left = offsets.left;
}
if (gpuAcceleration && prefixedProperty) {
styles[prefixedProperty] = `translate3d(${left}px, ${top}px, 0)`;
styles[sideA] = 0;
styles[sideB] = 0;
styles.willChange = 'transform';
} else {
// othwerise, we use the standard `top`, `left`, `bottom` and `right` properties
const invertTop = sideA === 'bottom' ? -1 : 1;
const invertLeft = sideB === 'right' ? -1 : 1;
styles[sideA] = top * invertTop;
styles[sideB] = left * invertLeft;
styles.willChange = `${sideA}, ${sideB}`;
}
// Attributes
const attributes = {
'x-placement': data.placement,
};
// Update `data` attributes, styles and arrowStyles
data.attributes = { ...attributes, ...data.attributes };
data.styles = { ...styles, ...data.styles };
data.arrowStyles = { ...data.offsets.arrow, ...data.arrowStyles };
return data;
}