history.js
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var zrUtil = require("zrender/lib/core/util");
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
var each = zrUtil.each;
var ATTR = '\0_ec_hist_store';
/**
* @param {module:echarts/model/Global} ecModel
* @param {Object} newSnapshot {dataZoomId, batch: [payloadInfo, ...]}
*/
function push(ecModel, newSnapshot) {
var store = giveStore(ecModel); // If previous dataZoom can not be found,
// complete an range with current range.
each(newSnapshot, function (batchItem, dataZoomId) {
var i = store.length - 1;
for (; i >= 0; i--) {
var snapshot = store[i];
if (snapshot[dataZoomId]) {
break;
}
}
if (i < 0) {
// No origin range set, create one by current range.
var dataZoomModel = ecModel.queryComponents({
mainType: 'dataZoom',
subType: 'select',
id: dataZoomId
})[0];
if (dataZoomModel) {
var percentRange = dataZoomModel.getPercentRange();
store[0][dataZoomId] = {
dataZoomId: dataZoomId,
start: percentRange[0],
end: percentRange[1]
};
}
}
});
store.push(newSnapshot);
}
/**
* @param {module:echarts/model/Global} ecModel
* @return {Object} snapshot
*/
function pop(ecModel) {
var store = giveStore(ecModel);
var head = store[store.length - 1];
store.length > 1 && store.pop(); // Find top for all dataZoom.
var snapshot = {};
each(head, function (batchItem, dataZoomId) {
for (var i = store.length - 1; i >= 0; i--) {
var batchItem = store[i][dataZoomId];
if (batchItem) {
snapshot[dataZoomId] = batchItem;
break;
}
}
});
return snapshot;
}
/**
* @param {module:echarts/model/Global} ecModel
*/
function clear(ecModel) {
ecModel[ATTR] = null;
}
/**
* @param {module:echarts/model/Global} ecModel
* @return {number} records. always >= 1.
*/
function count(ecModel) {
return giveStore(ecModel).length;
}
/**
* [{key: dataZoomId, value: {dataZoomId, range}}, ...]
* History length of each dataZoom may be different.
* this._history[0] is used to store origin range.
* @type {Array.<Object>}
*/
function giveStore(ecModel) {
var store = ecModel[ATTR];
if (!store) {
store = ecModel[ATTR] = [{}];
}
return store;
}
exports.push = push;
exports.pop = pop;
exports.clear = clear;
exports.count = count;