Current File : /home/tradevaly/www/node_modules/echarts/lib/component/dataZoom/history.js

/*
* 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 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;