120 lines
4.8 KiB
JavaScript
120 lines
4.8 KiB
JavaScript
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/**
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* Calculate slider move result.
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* Usage:
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* (1) If both handle0 and handle1 are needed to be moved, set minSpan the same as
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* maxSpan and the same as `Math.abs(handleEnd[1] - handleEnds[0])`.
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* (2) If handle0 is forbidden to cross handle1, set minSpan as `0`.
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*
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* @param {number} delta Move length.
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* @param {Array.<number>} handleEnds handleEnds[0] can be bigger then handleEnds[1].
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* handleEnds will be modified in this method.
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* @param {Array.<number>} extent handleEnds is restricted by extent.
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* extent[0] should less or equals than extent[1].
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* @param {number|string} handleIndex Can be 'all', means that both move the two handleEnds.
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* @param {number} [minSpan] The range of dataZoom can not be smaller than that.
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* If not set, handle0 and cross handle1. If set as a non-negative
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* number (including `0`), handles will push each other when reaching
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* the minSpan.
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* @param {number} [maxSpan] The range of dataZoom can not be larger than that.
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* @return {Array.<number>} The input handleEnds.
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*/
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function _default(delta, handleEnds, extent, handleIndex, minSpan, maxSpan) {
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delta = delta || 0;
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var extentSpan = extent[1] - extent[0]; // Notice maxSpan and minSpan can be null/undefined.
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if (minSpan != null) {
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minSpan = restrict(minSpan, [0, extentSpan]);
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}
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if (maxSpan != null) {
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maxSpan = Math.max(maxSpan, minSpan != null ? minSpan : 0);
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}
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if (handleIndex === 'all') {
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var handleSpan = Math.abs(handleEnds[1] - handleEnds[0]);
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handleSpan = restrict(handleSpan, [0, extentSpan]);
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minSpan = maxSpan = restrict(handleSpan, [minSpan, maxSpan]);
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handleIndex = 0;
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}
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handleEnds[0] = restrict(handleEnds[0], extent);
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handleEnds[1] = restrict(handleEnds[1], extent);
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var originalDistSign = getSpanSign(handleEnds, handleIndex);
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handleEnds[handleIndex] += delta; // Restrict in extent.
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var extentMinSpan = minSpan || 0;
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var realExtent = extent.slice();
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originalDistSign.sign < 0 ? realExtent[0] += extentMinSpan : realExtent[1] -= extentMinSpan;
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handleEnds[handleIndex] = restrict(handleEnds[handleIndex], realExtent); // Expand span.
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var currDistSign = getSpanSign(handleEnds, handleIndex);
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if (minSpan != null && (currDistSign.sign !== originalDistSign.sign || currDistSign.span < minSpan)) {
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// If minSpan exists, 'cross' is forbidden.
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handleEnds[1 - handleIndex] = handleEnds[handleIndex] + originalDistSign.sign * minSpan;
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} // Shrink span.
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var currDistSign = getSpanSign(handleEnds, handleIndex);
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if (maxSpan != null && currDistSign.span > maxSpan) {
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handleEnds[1 - handleIndex] = handleEnds[handleIndex] + currDistSign.sign * maxSpan;
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}
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return handleEnds;
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}
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function getSpanSign(handleEnds, handleIndex) {
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var dist = handleEnds[handleIndex] - handleEnds[1 - handleIndex]; // If `handleEnds[0] === handleEnds[1]`, always believe that handleEnd[0]
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// is at left of handleEnds[1] for non-cross case.
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return {
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span: Math.abs(dist),
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sign: dist > 0 ? -1 : dist < 0 ? 1 : handleIndex ? -1 : 1
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};
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}
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function restrict(value, extend) {
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return Math.min(extend[1] != null ? extend[1] : Infinity, Math.max(extend[0] != null ? extend[0] : -Infinity, value));
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}
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module.exports = _default; |