en/builder/src/echarts3/component/axisPointer/axisTrigger.js

import * as zrUtil from 'zrender/src/core/util';
import * as modelUtil from '../../util/model';
import * as modelHelper from './modelHelper';
import findPointFromSeries from './findPointFromSeries';
var each = zrUtil.each;
var curry = zrUtil.curry;
var get = modelUtil.makeGetter();
/**
 * Basic logic: check all axis, if they do not demand show/highlight,
 * then hide/downplay them.
 *
 * @param {Object} coordSysAxesInfo
 * @param {Object} payload
 * @param {string} [payload.currTrigger] 'click' | 'mousemove' | 'leave'
 * @param {Array.<number>} [payload.x] x and y, which are mandatory, specify a point to
 *              trigger axisPointer and tooltip.
 * @param {Array.<number>} [payload.y] x and y, which are mandatory, specify a point to
 *              trigger axisPointer and tooltip.
 * @param {Object} [payload.seriesIndex] finder, optional, restrict target axes.
 * @param {Object} [payload.dataIndex] finder, restrict target axes.
 * @param {Object} [payload.axesInfo] finder, restrict target axes.
 *        [{
 *          axisDim: 'x'|'y'|'angle'|...,
 *          axisIndex: ...,
 *          value: ...
 *        }, ...]
 * @param {Function} [payload.dispatchAction]
 * @param {Object} [payload.tooltipOption]
 * @param {Object|Array.<number>|Function} [payload.position] Tooltip position,
 *        which can be specified in dispatchAction
 * @param {module:echarts/model/Global} ecModel
 * @param {module:echarts/ExtensionAPI} api
 * @return {Object} content of event obj for echarts.connect.
 */

export default function (payload, ecModel, api) {
  var currTrigger = payload.currTrigger;
  var point = [payload.x, payload.y];
  var finder = payload;
  var dispatchAction = payload.dispatchAction || zrUtil.bind(api.dispatchAction, api);
  var coordSysAxesInfo = ecModel.getComponent('axisPointer').coordSysAxesInfo; // Pending
  // See #6121. But we are not able to reproduce it yet.

  if (!coordSysAxesInfo) {
    return;
  }

  if (illegalPoint(point)) {
    // Used in the default behavior of `connection`: use the sample seriesIndex
    // and dataIndex. And also used in the tooltipView trigger.
    point = findPointFromSeries({
      seriesIndex: finder.seriesIndex,
      // Do not use dataIndexInside from other ec instance.
      // FIXME: auto detect it?
      dataIndex: finder.dataIndex
    }, ecModel).point;
  }

  var isIllegalPoint = illegalPoint(point); // Axis and value can be specified when calling dispatchAction({type: 'updateAxisPointer'}).
  // Notice: In this case, it is difficult to get the `point` (which is necessary to show
  // tooltip, so if point is not given, we just use the point found by sample seriesIndex
  // and dataIndex.

  var inputAxesInfo = finder.axesInfo;
  var axesInfo = coordSysAxesInfo.axesInfo;
  var shouldHide = currTrigger === 'leave' || illegalPoint(point);
  var outputFinder = {};
  var showValueMap = {};
  var dataByCoordSys = {
    list: [],
    map: {}
  };
  var updaters = {
    showPointer: curry(showPointer, showValueMap),
    showTooltip: curry(showTooltip, dataByCoordSys)
  }; // Process for triggered axes.

  each(coordSysAxesInfo.coordSysMap, function (coordSys, coordSysKey) {
    // If a point given, it must be contained by the coordinate system.
    var coordSysContainsPoint = isIllegalPoint || coordSys.containPoint(point);
    each(coordSysAxesInfo.coordSysAxesInfo[coordSysKey], function (axisInfo, key) {
      var axis = axisInfo.axis;
      var inputAxisInfo = findInputAxisInfo(inputAxesInfo, axisInfo); // If no inputAxesInfo, no axis is restricted.

      if (!shouldHide && coordSysContainsPoint && (!inputAxesInfo || inputAxisInfo)) {
        var val = inputAxisInfo && inputAxisInfo.value;

        if (val == null && !isIllegalPoint) {
          val = axis.pointToData(point);
        }

        val != null && processOnAxis(axisInfo, val, updaters, false, outputFinder);
      }
    });
  }); // Process for linked axes.

  var linkTriggers = {};
  each(axesInfo, function (tarAxisInfo, tarKey) {
    var linkGroup = tarAxisInfo.linkGroup; // If axis has been triggered in the previous stage, it should not be triggered by link.

    if (linkGroup && !showValueMap[tarKey]) {
      each(linkGroup.axesInfo, function (srcAxisInfo, srcKey) {
        var srcValItem = showValueMap[srcKey]; // If srcValItem exist, source axis is triggered, so link to target axis.

        if (srcAxisInfo !== tarAxisInfo && srcValItem) {
          var val = srcValItem.value;
          linkGroup.mapper && (val = tarAxisInfo.axis.scale.parse(linkGroup.mapper(val, makeMapperParam(srcAxisInfo), makeMapperParam(tarAxisInfo))));
          linkTriggers[tarAxisInfo.key] = val;
        }
      });
    }
  });
  each(linkTriggers, function (val, tarKey) {
    processOnAxis(axesInfo[tarKey], val, updaters, true, outputFinder);
  });
  updateModelActually(showValueMap, axesInfo, outputFinder);
  dispatchTooltipActually(dataByCoordSys, point, payload, dispatchAction);
  dispatchHighDownActually(axesInfo, dispatchAction, api);
  return outputFinder;
}

function processOnAxis(axisInfo, newValue, updaters, dontSnap, outputFinder) {
  var axis = axisInfo.axis;

  if (axis.scale.isBlank() || !axis.containData(newValue)) {
    return;
  }

  if (!axisInfo.involveSeries) {
    updaters.showPointer(axisInfo, newValue);
    return;
  } // Heavy calculation. So put it after axis.containData checking.


  var payloadInfo = buildPayloadsBySeries(newValue, axisInfo);
  var payloadBatch = payloadInfo.payloadBatch;
  var snapToValue = payloadInfo.snapToValue; // Fill content of event obj for echarts.connect.
  // By defualt use the first involved series data as a sample to connect.

  if (payloadBatch[0] && outputFinder.seriesIndex == null) {
    zrUtil.extend(outputFinder, payloadBatch[0]);
  } // If no linkSource input, this process is for collecting link
  // target, where snap should not be accepted.


  if (!dontSnap && axisInfo.snap) {
    if (axis.containData(snapToValue) && snapToValue != null) {
      newValue = snapToValue;
    }
  }

  updaters.showPointer(axisInfo, newValue, payloadBatch, outputFinder); // Tooltip should always be snapToValue, otherwise there will be
  // incorrect "axis value ~ series value" mapping displayed in tooltip.

  updaters.showTooltip(axisInfo, payloadInfo, snapToValue);
}

function buildPayloadsBySeries(value, axisInfo) {
  var axis = axisInfo.axis;
  var dim = axis.dim;
  var snapToValue = value;
  var payloadBatch = [];
  var minDist = Number.MAX_VALUE;
  var minDiff = -1;
  each(axisInfo.seriesModels, function (series, idx) {
    var dataDim = series.coordDimToDataDim(dim);
    var seriesNestestValue;
    var dataIndices;

    if (series.getAxisTooltipData) {
      var result = series.getAxisTooltipData(dataDim, value, axis);
      dataIndices = result.dataIndices;
      seriesNestestValue = result.nestestValue;
    } else {
      dataIndices = series.getData().indicesOfNearest(dataDim[0], value, // Add a threshold to avoid find the wrong dataIndex
      // when data length is not same.
      false, axis.type === 'category' ? 0.5 : null);

      if (!dataIndices.length) {
        return;
      }

      seriesNestestValue = series.getData().get(dataDim[0], dataIndices[0]);
    }

    if (seriesNestestValue == null || !isFinite(seriesNestestValue)) {
      return;
    }

    var diff = value - seriesNestestValue;
    var dist = Math.abs(diff); // Consider category case

    if (dist <= minDist) {
      if (dist < minDist || diff >= 0 && minDiff < 0) {
        minDist = dist;
        minDiff = diff;
        snapToValue = seriesNestestValue;
        payloadBatch.length = 0;
      }

      each(dataIndices, function (dataIndex) {
        payloadBatch.push({
          seriesIndex: series.seriesIndex,
          dataIndexInside: dataIndex,
          dataIndex: series.getData().getRawIndex(dataIndex)
        });
      });
    }
  });
  return {
    payloadBatch: payloadBatch,
    snapToValue: snapToValue
  };
}

function showPointer(showValueMap, axisInfo, value, payloadBatch) {
  showValueMap[axisInfo.key] = {
    value: value,
    payloadBatch: payloadBatch
  };
}

function showTooltip(dataByCoordSys, axisInfo, payloadInfo, value) {
  var payloadBatch = payloadInfo.payloadBatch;
  var axis = axisInfo.axis;
  var axisModel = axis.model;
  var axisPointerModel = axisInfo.axisPointerModel; // If no data, do not create anything in dataByCoordSys,
  // whose length will be used to judge whether dispatch action.

  if (!axisInfo.triggerTooltip || !payloadBatch.length) {
    return;
  }

  var coordSysModel = axisInfo.coordSys.model;
  var coordSysKey = modelHelper.makeKey(coordSysModel);
  var coordSysItem = dataByCoordSys.map[coordSysKey];

  if (!coordSysItem) {
    coordSysItem = dataByCoordSys.map[coordSysKey] = {
      coordSysId: coordSysModel.id,
      coordSysIndex: coordSysModel.componentIndex,
      coordSysType: coordSysModel.type,
      coordSysMainType: coordSysModel.mainType,
      dataByAxis: []
    };
    dataByCoordSys.list.push(coordSysItem);
  }

  coordSysItem.dataByAxis.push({
    axisDim: axis.dim,
    axisIndex: axisModel.componentIndex,
    axisType: axisModel.type,
    axisId: axisModel.id,
    value: value,
    // Caustion: viewHelper.getValueLabel is actually on "view stage", which
    // depends that all models have been updated. So it should not be performed
    // here. Considering axisPointerModel used here is volatile, which is hard
    // to be retrieve in TooltipView, we prepare parameters here.
    valueLabelOpt: {
      precision: axisPointerModel.get('label.precision'),
      formatter: axisPointerModel.get('label.formatter')
    },
    seriesDataIndices: payloadBatch.slice()
  });
}

function updateModelActually(showValueMap, axesInfo, outputFinder) {
  var outputAxesInfo = outputFinder.axesInfo = []; // Basic logic: If no 'show' required, 'hide' this axisPointer.

  each(axesInfo, function (axisInfo, key) {
    var option = axisInfo.axisPointerModel.option;
    var valItem = showValueMap[key];

    if (valItem) {
      !axisInfo.useHandle && (option.status = 'show');
      option.value = valItem.value; // For label formatter param and highlight.

      option.seriesDataIndices = (valItem.payloadBatch || []).slice();
    } // When always show (e.g., handle used), remain
    // original value and status.
    else {
        // If hide, value still need to be set, consider
        // click legend to toggle axis blank.
        !axisInfo.useHandle && (option.status = 'hide');
      } // If status is 'hide', should be no info in payload.


    option.status === 'show' && outputAxesInfo.push({
      axisDim: axisInfo.axis.dim,
      axisIndex: axisInfo.axis.model.componentIndex,
      value: option.value
    });
  });
}

function dispatchTooltipActually(dataByCoordSys, point, payload, dispatchAction) {
  // Basic logic: If no showTip required, hideTip will be dispatched.
  if (illegalPoint(point) || !dataByCoordSys.list.length) {
    dispatchAction({
      type: 'hideTip'
    });
    return;
  } // In most case only one axis (or event one series is used). It is
  // convinient to fetch payload.seriesIndex and payload.dataIndex
  // dirtectly. So put the first seriesIndex and dataIndex of the first
  // axis on the payload.


  var sampleItem = ((dataByCoordSys.list[0].dataByAxis[0] || {}).seriesDataIndices || [])[0] || {};
  dispatchAction({
    type: 'showTip',
    escapeConnect: true,
    x: point[0],
    y: point[1],
    tooltipOption: payload.tooltipOption,
    position: payload.position,
    dataIndexInside: sampleItem.dataIndexInside,
    dataIndex: sampleItem.dataIndex,
    seriesIndex: sampleItem.seriesIndex,
    dataByCoordSys: dataByCoordSys.list
  });
}

function dispatchHighDownActually(axesInfo, dispatchAction, api) {
  // FIXME
  // highlight status modification shoule be a stage of main process?
  // (Consider confilct (e.g., legend and axisPointer) and setOption)
  var zr = api.getZr();
  var highDownKey = 'axisPointerLastHighlights';
  var lastHighlights = get(zr)[highDownKey] || {};
  var newHighlights = get(zr)[highDownKey] = {}; // Update highlight/downplay status according to axisPointer model.
  // Build hash map and remove duplicate incidentally.

  each(axesInfo, function (axisInfo, key) {
    var option = axisInfo.axisPointerModel.option;
    option.status === 'show' && each(option.seriesDataIndices, function (batchItem) {
      var key = batchItem.seriesIndex + ' | ' + batchItem.dataIndex;
      newHighlights[key] = batchItem;
    });
  }); // Diff.

  var toHighlight = [];
  var toDownplay = [];
  zrUtil.each(lastHighlights, function (batchItem, key) {
    !newHighlights[key] && toDownplay.push(batchItem);
  });
  zrUtil.each(newHighlights, function (batchItem, key) {
    !lastHighlights[key] && toHighlight.push(batchItem);
  });
  toDownplay.length && api.dispatchAction({
    type: 'downplay',
    escapeConnect: true,
    batch: toDownplay
  });
  toHighlight.length && api.dispatchAction({
    type: 'highlight',
    escapeConnect: true,
    batch: toHighlight
  });
}

function findInputAxisInfo(inputAxesInfo, axisInfo) {
  for (var i = 0; i < (inputAxesInfo || []).length; i++) {
    var inputAxisInfo = inputAxesInfo[i];

    if (axisInfo.axis.dim === inputAxisInfo.axisDim && axisInfo.axis.model.componentIndex === inputAxisInfo.axisIndex) {
      return inputAxisInfo;
    }
  }
}

function makeMapperParam(axisInfo) {
  var axisModel = axisInfo.axis.model;
  var item = {};
  var dim = item.axisDim = axisInfo.axis.dim;
  item.axisIndex = item[dim + 'AxisIndex'] = axisModel.componentIndex;
  item.axisName = item[dim + 'AxisName'] = axisModel.name;
  item.axisId = item[dim + 'AxisId'] = axisModel.id;
  return item;
}

function illegalPoint(point) {
  return !point || point[0] == null || isNaN(point[0]) || point[1] == null || isNaN(point[1]);
}