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Diffstat (limited to 'popperjs/package/lib/modifiers/flip.js')
| -rw-r--r-- | popperjs/package/lib/modifiers/flip.js | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/popperjs/package/lib/modifiers/flip.js b/popperjs/package/lib/modifiers/flip.js new file mode 100644 index 0000000..2c33216 --- /dev/null +++ b/popperjs/package/lib/modifiers/flip.js @@ -0,0 +1,147 @@ +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 + } +};
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