67 lines
2.8 KiB
JavaScript
67 lines
2.8 KiB
JavaScript
import { parse, stringify } from 'css-box-shadow';
|
|
|
|
// Only supports border radius defined like "20px" or "100%"
|
|
const transformedRadius = (radiusString, deltaWidth, deltaHeight) => {
|
|
if (/^\d+\.?\d*px$/.test(radiusString)) {
|
|
//The radius is defined in pixel units, so get the radius as a number
|
|
const rad = +radiusString.match(/\d+\.?\d*/)[0];
|
|
// Set the x and y radius of the "to" element, compensating for scale
|
|
return `${rad / deltaWidth}px / ${rad / deltaHeight}px`;
|
|
} else if (/^\d+\.?\d*%$/.test(radiusString)) {
|
|
//The radius is defined as a percentage, so just use it as is
|
|
return radiusString;
|
|
}
|
|
};
|
|
|
|
const transformedBoxShadow = (shadowString, deltaWidth, deltaHeight) => {
|
|
if (shadowString === 'none') return shadowString;
|
|
if (shadowString[0] === 'r') {
|
|
let strings = shadowString.match(/rgba\([^)]+\)[^,]+/g);
|
|
strings = strings.map(string => {
|
|
// Move color to end
|
|
let m = string.match(/(rgba\([^)]+\))([^,]+)/);
|
|
return `${m[2].trim()} ${m[1]}`;
|
|
});
|
|
shadowString = strings.join(', ');
|
|
}
|
|
let scaleAverage = (deltaWidth + deltaHeight) / 2;
|
|
let shadows = parse(shadowString);
|
|
shadows.forEach(shadow => {
|
|
shadow.offsetX /= deltaWidth;
|
|
shadow.offsetY /= deltaHeight;
|
|
shadow.blurRadius /= scaleAverage;
|
|
shadow.spreadRadius /= scaleAverage;
|
|
})
|
|
return stringify(shadows);
|
|
}
|
|
|
|
export default function mockElement({ source, target, offset = { x: 0, y: 0 } }) {
|
|
if (!source || !target) throw `Can't mock without ${source ? 'target' : 'source'}`;
|
|
let sourceRect = source.getBoundingClientRect();
|
|
let targetRect = target.getBoundingClientRect();
|
|
|
|
// Get how must the target change to become the source
|
|
const deltaWidth = sourceRect.width / targetRect.width;
|
|
const deltaHeight = sourceRect.height / targetRect.height;
|
|
const deltaLeft = sourceRect.left - targetRect.left + offset.x;
|
|
const deltaTop = sourceRect.top - targetRect.top + offset.y;
|
|
// Mock the source
|
|
target.style.transform = `translate(${deltaLeft}px, ${deltaTop}px) ` +
|
|
`scale(${deltaWidth}, ${deltaHeight})`;
|
|
// Mock the background color unless it's completely transparent
|
|
let backgroundColor = getComputedStyle(source).backgroundColor
|
|
if (backgroundColor !== 'rgba(0, 0, 0, 0)') {
|
|
target.style.backgroundColor = backgroundColor;
|
|
}
|
|
// Edge might not combine all border radii into a single value,
|
|
// So we just sample the top left one if we need to
|
|
let oldRadius = getComputedStyle(source).borderRadius ||
|
|
getComputedStyle(source).borderTopLeftRadius;
|
|
let borderRadius = transformedRadius(oldRadius, deltaWidth, deltaHeight);
|
|
target.style.borderRadius = borderRadius;
|
|
let boxShadow = transformedBoxShadow(
|
|
getComputedStyle(source).boxShadow, deltaWidth, deltaHeight
|
|
);
|
|
target.style.setProperty('box-shadow', boxShadow, 'important');
|
|
}
|