Initial commit

wwwroot/lib/popper.js/esm/modifiers/flip.js

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+import getOppositePlacement from "../utils/getOppositePlacement.js";
+import getBasePlacement from "../utils/getBasePlacement.js";
+import getOppositeVariationPlacement from "../utils/getOppositeVariationPlacement.js";
+import detectOverflow from "../utils/detectOverflow.js";
+import computeAutoPlacement from "../utils/computeAutoPlacement.js";
+import { bottom, top, start, right, left, auto } from "../enums.js";
+import getVariation from "../utils/getVariation.js"; // eslint-disable-next-line import/no-unused-modules
+
+function getExpandedFallbackPlacements(placement) {
+  if (getBasePlacement(placement) === auto) {
+    return [];
+  }
+
+  var oppositePlacement = getOppositePlacement(placement);
+  return [getOppositeVariationPlacement(placement), oppositePlacement, getOppositeVariationPlacement(oppositePlacement)];
+}
+
+function flip(_ref) {
+  var state = _ref.state,
+      options = _ref.options,
+      name = _ref.name;
+
+  if (state.modifiersData[name]._skip) {
+    return;
+  }
+
+  var _options$mainAxis = options.mainAxis,
+      checkMainAxis = _options$mainAxis === void 0 ? true : _options$mainAxis,
+      _options$altAxis = options.altAxis,
+      checkAltAxis = _options$altAxis === void 0 ? true : _options$altAxis,
+      specifiedFallbackPlacements = options.fallbackPlacements,
+      padding = options.padding,
+      boundary = options.boundary,
+      rootBoundary = options.rootBoundary,
+      altBoundary = options.altBoundary,
+      _options$flipVariatio = options.flipVariations,
+      flipVariations = _options$flipVariatio === void 0 ? true : _options$flipVariatio,
+      allowedAutoPlacements = options.allowedAutoPlacements;
+  var preferredPlacement = state.options.placement;
+  var basePlacement = getBasePlacement(preferredPlacement);
+  var isBasePlacement = basePlacement === preferredPlacement;
+  var fallbackPlacements = specifiedFallbackPlacements || (isBasePlacement || !flipVariations ? [getOppositePlacement(preferredPlacement)] : getExpandedFallbackPlacements(preferredPlacement));
+  var placements = [preferredPlacement].concat(fallbackPlacements).reduce(function (acc, placement) {
+    return acc.concat(getBasePlacement(placement) === auto ? computeAutoPlacement(state, {
+      placement: placement,
+      boundary: boundary,
+      rootBoundary: rootBoundary,
+      padding: padding,
+      flipVariations: flipVariations,
+      allowedAutoPlacements: allowedAutoPlacements
+    }) : placement);
+  }, []);
+  var referenceRect = state.rects.reference;
+  var popperRect = state.rects.popper;
+  var checksMap = new Map();
+  var makeFallbackChecks = true;
+  var firstFittingPlacement = placements[0];
+
+  for (var i = 0; i < placements.length; i++) {
+    var placement = placements[i];
+
+    var _basePlacement = getBasePlacement(placement);
+
+    var isStartVariation = getVariation(placement) === start;
+    var isVertical = [top, bottom].indexOf(_basePlacement) >= 0;
+    var len = isVertical ? 'width' : 'height';
+    var overflow = detectOverflow(state, {
+      placement: placement,
+      boundary: boundary,
+      rootBoundary: rootBoundary,
+      altBoundary: altBoundary,
+      padding: padding
+    });
+    var mainVariationSide = isVertical ? isStartVariation ? right : left : isStartVariation ? bottom : top;
+
+    if (referenceRect[len] > popperRect[len]) {
+      mainVariationSide = getOppositePlacement(mainVariationSide);
+    }
+
+    var altVariationSide = getOppositePlacement(mainVariationSide);
+    var checks = [];
+
+    if (checkMainAxis) {
+      checks.push(overflow[_basePlacement] <= 0);
+    }
+
+    if (checkAltAxis) {
+      checks.push(overflow[mainVariationSide] <= 0, overflow[altVariationSide] <= 0);
+    }
+
+    if (checks.every(function (check) {
+      return check;
+    })) {
+      firstFittingPlacement = placement;
+      makeFallbackChecks = false;
+      break;
+    }
+
+    checksMap.set(placement, checks);
+  }
+
+  if (makeFallbackChecks) {
+    // `2` may be desired in some cases – research later
+    var numberOfChecks = flipVariations ? 3 : 1;
+
+    var _loop = function _loop(_i) {
+      var fittingPlacement = placements.find(function (placement) {
+        var checks = checksMap.get(placement);
+
+        if (checks) {
+          return checks.slice(0, _i).every(function (check) {
+            return check;
+          });
+        }
+      });
+
+      if (fittingPlacement) {
+        firstFittingPlacement = fittingPlacement;
+        return "break";
+      }
+    };
+
+    for (var _i = numberOfChecks; _i > 0; _i--) {
+      var _ret = _loop(_i);
+
+      if (_ret === "break") break;
+    }
+  }
+
+  if (state.placement !== firstFittingPlacement) {
+    state.modifiersData[name]._skip = true;
+    state.placement = firstFittingPlacement;
+    state.reset = true;
+  }
+} // eslint-disable-next-line import/no-unused-modules
+
+
+export default {
+  name: 'flip',
+  enabled: true,
+  phase: 'main',
+  fn: flip,
+  requiresIfExists: ['offset'],
+  data: {
+    _skip: false
+  }
+};