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F4SDwebService/packages/popper.js.1.16.1/content/Scripts/src/utils/getPopperOffsets.js

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+import getOuterSizes from './getOuterSizes';
+import getOppositePlacement from './getOppositePlacement';
+
+/**
+ * Get offsets to the popper
+ * @method
+ * @memberof Popper.Utils
+ * @param {Object} position - CSS position the Popper will get applied
+ * @param {HTMLElement} popper - the popper element
+ * @param {Object} referenceOffsets - the reference offsets (the popper will be relative to this)
+ * @param {String} placement - one of the valid placement options
+ * @returns {Object} popperOffsets - An object containing the offsets which will be applied to the popper
+ */
+export default function getPopperOffsets(popper, referenceOffsets, placement) {
+  placement = placement.split('-')[0];
+
+  // Get popper node sizes
+  const popperRect = getOuterSizes(popper);
+
+  // Add position, width and height to our offsets object
+  const popperOffsets = {
+    width: popperRect.width,
+    height: popperRect.height,
+  };
+
+  // depending by the popper placement we have to compute its offsets slightly differently
+  const isHoriz = ['right', 'left'].indexOf(placement) !== -1;
+  const mainSide = isHoriz ? 'top' : 'left';
+  const secondarySide = isHoriz ? 'left' : 'top';
+  const measurement = isHoriz ? 'height' : 'width';
+  const secondaryMeasurement = !isHoriz ? 'height' : 'width';
+
+  popperOffsets[mainSide] =
+    referenceOffsets[mainSide] +
+    referenceOffsets[measurement] / 2 -
+    popperRect[measurement] / 2;
+  if (placement === secondarySide) {
+    popperOffsets[secondarySide] =
+      referenceOffsets[secondarySide] - popperRect[secondaryMeasurement];
+  } else {
+    popperOffsets[secondarySide] =
+      referenceOffsets[getOppositePlacement(secondarySide)];
+  }
+
+  return popperOffsets;
+}