react-native-reanimated/lib/module/reanimated2/layoutReanimation/web/componentStyle.js

More powerful alternative to Animated library for React Native.

'use strict';

import { _updatePropsJS } from '../../js-reanimated';
export const snapshots = new WeakMap();
export function makeElementVisible(element, delay) {
  if (delay === 0) {
    _updatePropsJS({
      visibility: 'initial'
    }, {
      _component: element
    });
  } else {
    setTimeout(() => {
      _updatePropsJS({
        visibility: 'initial'
      }, {
        _component: element
      });
    }, delay * 1000);
  }
}
function fixElementPosition(element, parent, snapshot) {
  const parentRect = parent.getBoundingClientRect();
  const parentBorderTopValue = parseInt(getComputedStyle(parent).borderTopWidth);
  const parentBorderLeftValue = parseInt(getComputedStyle(parent).borderLeftWidth);
  const dummyRect = element.getBoundingClientRect();
  // getBoundingClientRect returns DOMRect with position of the element with respect to document body.
  // However, using position `absolute` doesn't guarantee, that the dummy will be placed relative to body element.
  // The trick below allows us to once again get position relative to body, by comparing snapshot with new position of the dummy.
  if (dummyRect.top !== snapshot.top) {
    element.style.top = `${snapshot.top - parentRect.top - parentBorderTopValue}px`;
  }
  if (dummyRect.left !== snapshot.left) {
    element.style.left = `${snapshot.left - parentRect.left - parentBorderLeftValue}px`;
  }
}
export function setDummyPosition(dummy, snapshot) {
  dummy.style.transform = '';
  dummy.style.position = 'absolute';
  dummy.style.top = `${snapshot.top}px`;
  dummy.style.left = `${snapshot.left}px`;
  dummy.style.width = `${snapshot.width}px`;
  dummy.style.height = `${snapshot.height}px`;
  dummy.style.margin = '0px'; // tmpElement has absolute position, so margin is not necessary

  if (dummy.parentElement) {
    fixElementPosition(dummy, dummy.parentElement, snapshot);
  }
}
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