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F4SDwebService/Publish/Scripts/src/modifiers/shift.js

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+/**
+ * @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 shift(data) {
+  const placement = data.placement;
+  const basePlacement = placement.split('-')[0];
+  const shiftvariation = placement.split('-')[1];
+
+  // if shift shiftvariation is specified, run the modifier
+  if (shiftvariation) {
+    const { reference, popper } = data.offsets;
+    const isVertical = ['bottom', 'top'].indexOf(basePlacement) !== -1;
+    const side = isVertical ? 'left' : 'top';
+    const measurement = isVertical ? 'width' : 'height';
+
+    const shiftOffsets = {
+      start: { [side]: reference[side] },
+      end: {
+        [side]: reference[side] + reference[measurement] - popper[measurement],
+      },
+    };
+
+    data.offsets.popper = { ...popper, ...shiftOffsets[shiftvariation] };
+  }
+
+  return data;
+}