echarts LegendVisualProvider 源码
echarts LegendVisualProvider 代码
文件路径：/src/visual/LegendVisualProvider.ts
import SeriesData from '../data/SeriesData';
/*
* 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.
*/
/**
* LegendVisualProvider is an bridge that pick encoded color from data and
* provide to the legend component.
*/
class LegendVisualProvider {
private _getDataWithEncodedVisual: () => SeriesData;
private _getRawData: () => SeriesData;
constructor(
// Function to get data after filtered. It stores all the encoding info
getDataWithEncodedVisual: () => SeriesData,
// Function to get raw data before filtered.
getRawData: () => SeriesData
) {
this._getDataWithEncodedVisual = getDataWithEncodedVisual;
this._getRawData = getRawData;
}
getAllNames(): string[] {
const rawData = this._getRawData();
// We find the name from the raw data. In case it's filtered by the legend component.
// Normally, the name can be found in rawData, but can't be found in filtered data will display as gray.
return rawData.mapArray(rawData.getName);
}
containName(name: string): boolean {
const rawData = this._getRawData();
return rawData.indexOfName(name) >= 0;
}
indexOfName(name: string): number {
// Only get data when necessary.
// Because LegendVisualProvider constructor may be new in the stage that data is not prepared yet.
// Invoking Series#getData immediately will throw an error.
const dataWithEncodedVisual = this._getDataWithEncodedVisual();
return dataWithEncodedVisual.indexOfName(name);
}
getItemVisual(dataIndex: number, key: string): any {
// Get encoded visual properties from final filtered data.
const dataWithEncodedVisual = this._getDataWithEncodedVisual();
return dataWithEncodedVisual.getItemVisual(dataIndex, key as any);
}
}
export default LegendVisualProvider;
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