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/**
* @file History manager.
*/
define(function(require) {
var zrUtil = require('zrender/core/util');
var each = zrUtil.each;
var ATTR = '\0_ec_hist_store';
var history = {
/**
* @public
* @param {module:echarts/model/Global} ecModel
* @param {Object} newSnapshot {dataZoomId, batch: [payloadInfo, ...]}
*/
push: function (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);
},
/**
* @public
* @param {module:echarts/model/Global} ecModel
* @return {Object} snapshot
*/
pop: function (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;
},
/**
* @public
*/
clear: function (ecModel) {
ecModel[ATTR] = null;
},
/**
* @public
* @param {module:echarts/model/Global} ecModel
* @return {number} records. always >= 1.
*/
count: function (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;
}
return history;
});