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"use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports["default"] = defaultOverscanIndicesGetter; exports.SCROLL_DIRECTION_VERTICAL = exports.SCROLL_DIRECTION_HORIZONTAL = exports.SCROLL_DIRECTION_FORWARD = exports.SCROLL_DIRECTION_BACKWARD = void 0; var _types = require("./types"); var SCROLL_DIRECTION_BACKWARD = -1; exports.SCROLL_DIRECTION_BACKWARD = SCROLL_DIRECTION_BACKWARD; var SCROLL_DIRECTION_FORWARD = 1; exports.SCROLL_DIRECTION_FORWARD = SCROLL_DIRECTION_FORWARD; var SCROLL_DIRECTION_HORIZONTAL = 'horizontal'; exports.SCROLL_DIRECTION_HORIZONTAL = SCROLL_DIRECTION_HORIZONTAL; var SCROLL_DIRECTION_VERTICAL = 'vertical'; /** * Calculates the number of cells to overscan before and after a specified range. * This function ensures that overscanning doesn't exceed the available cells. */ exports.SCROLL_DIRECTION_VERTICAL = SCROLL_DIRECTION_VERTICAL; function defaultOverscanIndicesGetter(_ref) { var cellCount = _ref.cellCount, overscanCellsCount = _ref.overscanCellsCount, scrollDirection = _ref.scrollDirection, startIndex = _ref.startIndex, stopIndex = _ref.stopIndex; // Make sure we render at least 1 cell extra before and after (except near boundaries) // This is necessary in order to support keyboard navigation (TAB/SHIFT+TAB) in some cases // For more info see issues #625 overscanCellsCount = Math.max(1, overscanCellsCount); if (scrollDirection === SCROLL_DIRECTION_FORWARD) { return { overscanStartIndex: Math.max(0, startIndex - 1), overscanStopIndex: Math.min(cellCount - 1, stopIndex + overscanCellsCount) }; } else { return { overscanStartIndex: Math.max(0, startIndex - overscanCellsCount), overscanStopIndex: Math.min(cellCount - 1, stopIndex + 1) }; } }
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