public/zh/builder/src/echarts/component/dataZoom/SliderZoomView.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.
*/
import * as zrUtil from 'zrender/src/core/util';
import * as eventTool from 'zrender/src/core/event';
import * as graphic from '../../util/graphic';
import * as throttle from '../../util/throttle';
import DataZoomView from './DataZoomView';
import * as numberUtil from '../../util/number';
import * as layout from '../../util/layout';
import sliderMove from '../helper/sliderMove';
var Rect = graphic.Rect;
var linearMap = numberUtil.linearMap;
var asc = numberUtil.asc;
var bind = zrUtil.bind;
var each = zrUtil.each; // Constants

var DEFAULT_LOCATION_EDGE_GAP = 7;
var DEFAULT_FRAME_BORDER_WIDTH = 1;
var DEFAULT_FILLER_SIZE = 30;
var HORIZONTAL = 'horizontal';
var VERTICAL = 'vertical';
var LABEL_GAP = 5;
var SHOW_DATA_SHADOW_SERIES_TYPE = ['line', 'bar', 'candlestick', 'scatter'];
var SliderZoomView = DataZoomView.extend({
  type: 'dataZoom.slider',
  init: function (ecModel, api) {
    /**
     * @private
     * @type {Object}
     */
    this._displayables = {};
    /**
     * @private
     * @type {string}
     */

    this._orient;
    /**
     * [0, 100]
     * @private
     */

    this._range;
    /**
     * [coord of the first handle, coord of the second handle]
     * @private
     */

    this._handleEnds;
    /**
     * [length, thick]
     * @private
     * @type {Array.<number>}
     */

    this._size;
    /**
     * @private
     * @type {number}
     */

    this._handleWidth;
    /**
     * @private
     * @type {number}
     */

    this._handleHeight;
    /**
     * @private
     */

    this._location;
    /**
     * @private
     */

    this._dragging;
    /**
     * @private
     */

    this._dataShadowInfo;
    this.api = api;
  },

  /**
   * @override
   */
  render: function (dataZoomModel, ecModel, api, payload) {
    SliderZoomView.superApply(this, 'render', arguments);
    throttle.createOrUpdate(this, '_dispatchZoomAction', this.dataZoomModel.get('throttle'), 'fixRate');
    this._orient = dataZoomModel.get('orient');

    if (this.dataZoomModel.get('show') === false) {
      this.group.removeAll();
      return;
    } // Notice: this._resetInterval() should not be executed when payload.type
    // is 'dataZoom', origin this._range should be maintained, otherwise 'pan'
    // or 'zoom' info will be missed because of 'throttle' of this.dispatchAction,


    if (!payload || payload.type !== 'dataZoom' || payload.from !== this.uid) {
      this._buildView();
    }

    this._updateView();
  },

  /**
   * @override
   */
  remove: function () {
    SliderZoomView.superApply(this, 'remove', arguments);
    throttle.clear(this, '_dispatchZoomAction');
  },

  /**
   * @override
   */
  dispose: function () {
    SliderZoomView.superApply(this, 'dispose', arguments);
    throttle.clear(this, '_dispatchZoomAction');
  },
  _buildView: function () {
    var thisGroup = this.group;
    thisGroup.removeAll();

    this._resetLocation();

    this._resetInterval();

    var barGroup = this._displayables.barGroup = new graphic.Group();

    this._renderBackground();

    this._renderHandle();

    this._renderDataShadow();

    thisGroup.add(barGroup);

    this._positionGroup();
  },

  /**
   * @private
   */
  _resetLocation: function () {
    var dataZoomModel = this.dataZoomModel;
    var api = this.api; // If some of x/y/width/height are not specified,
    // auto-adapt according to target grid.

    var coordRect = this._findCoordRect();

    var ecSize = {
      width: api.getWidth(),
      height: api.getHeight()
    }; // Default align by coordinate system rect.

    var positionInfo = this._orient === HORIZONTAL ? {
      // Why using 'right', because right should be used in vertical,
      // and it is better to be consistent for dealing with position param merge.
      right: ecSize.width - coordRect.x - coordRect.width,
      top: ecSize.height - DEFAULT_FILLER_SIZE - DEFAULT_LOCATION_EDGE_GAP,
      width: coordRect.width,
      height: DEFAULT_FILLER_SIZE
    } : {
      // vertical
      right: DEFAULT_LOCATION_EDGE_GAP,
      top: coordRect.y,
      width: DEFAULT_FILLER_SIZE,
      height: coordRect.height
    }; // Do not write back to option and replace value 'ph', because
    // the 'ph' value should be recalculated when resize.

    var layoutParams = layout.getLayoutParams(dataZoomModel.option); // Replace the placeholder value.

    zrUtil.each(['right', 'top', 'width', 'height'], function (name) {
      if (layoutParams[name] === 'ph') {
        layoutParams[name] = positionInfo[name];
      }
    });
    var layoutRect = layout.getLayoutRect(layoutParams, ecSize, dataZoomModel.padding);
    this._location = {
      x: layoutRect.x,
      y: layoutRect.y
    };
    this._size = [layoutRect.width, layoutRect.height];
    this._orient === VERTICAL && this._size.reverse();
  },

  /**
   * @private
   */
  _positionGroup: function () {
    var thisGroup = this.group;
    var location = this._location;
    var orient = this._orient; // Just use the first axis to determine mapping.

    var targetAxisModel = this.dataZoomModel.getFirstTargetAxisModel();
    var inverse = targetAxisModel && targetAxisModel.get('inverse');
    var barGroup = this._displayables.barGroup;
    var otherAxisInverse = (this._dataShadowInfo || {}).otherAxisInverse; // Transform barGroup.

    barGroup.attr(orient === HORIZONTAL && !inverse ? {
      scale: otherAxisInverse ? [1, 1] : [1, -1]
    } : orient === HORIZONTAL && inverse ? {
      scale: otherAxisInverse ? [-1, 1] : [-1, -1]
    } : orient === VERTICAL && !inverse ? {
      scale: otherAxisInverse ? [1, -1] : [1, 1],
      rotation: Math.PI / 2 // Dont use Math.PI, considering shadow direction.

    } : {
      scale: otherAxisInverse ? [-1, -1] : [-1, 1],
      rotation: Math.PI / 2
    }); // Position barGroup

    var rect = thisGroup.getBoundingRect([barGroup]);
    thisGroup.attr('position', [location.x - rect.x, location.y - rect.y]);
  },

  /**
   * @private
   */
  _getViewExtent: function () {
    return [0, this._size[0]];
  },
  _renderBackground: function () {
    var dataZoomModel = this.dataZoomModel;
    var size = this._size;
    var barGroup = this._displayables.barGroup;
    barGroup.add(new Rect({
      silent: true,
      shape: {
        x: 0,
        y: 0,
        width: size[0],
        height: size[1]
      },
      style: {
        fill: dataZoomModel.get('backgroundColor')
      },
      z2: -40
    })); // Click panel, over shadow, below handles.

    barGroup.add(new Rect({
      shape: {
        x: 0,
        y: 0,
        width: size[0],
        height: size[1]
      },
      style: {
        fill: 'transparent'
      },
      z2: 0,
      onclick: zrUtil.bind(this._onClickPanelClick, this)
    }));
  },
  _renderDataShadow: function () {
    var info = this._dataShadowInfo = this._prepareDataShadowInfo();

    if (!info) {
      return;
    }

    var size = this._size;
    var seriesModel = info.series;
    var data = seriesModel.getRawData();
    var otherDim = seriesModel.getShadowDim ? seriesModel.getShadowDim() // @see candlestick
    : info.otherDim;

    if (otherDim == null) {
      return;
    }

    var otherDataExtent = data.getDataExtent(otherDim); // Nice extent.

    var otherOffset = (otherDataExtent[1] - otherDataExtent[0]) * 0.3;
    otherDataExtent = [otherDataExtent[0] - otherOffset, otherDataExtent[1] + otherOffset];
    var otherShadowExtent = [0, size[1]];
    var thisShadowExtent = [0, size[0]];
    var areaPoints = [[size[0], 0], [0, 0]];
    var linePoints = [];
    var step = thisShadowExtent[1] / (data.count() - 1);
    var thisCoord = 0; // Optimize for large data shadow

    var stride = Math.round(data.count() / size[0]);
    var lastIsEmpty;
    data.each([otherDim], function (value, index) {
      if (stride > 0 && index % stride) {
        thisCoord += step;
        return;
      } // FIXME
      // Should consider axis.min/axis.max when drawing dataShadow.
      // FIXME
      // 应该使用统一的空判断？还是在list里进行空判断？


      var isEmpty = value == null || isNaN(value) || value === ''; // See #4235.

      var otherCoord = isEmpty ? 0 : linearMap(value, otherDataExtent, otherShadowExtent, true); // Attempt to draw data shadow precisely when there are empty value.

      if (isEmpty && !lastIsEmpty && index) {
        areaPoints.push([areaPoints[areaPoints.length - 1][0], 0]);
        linePoints.push([linePoints[linePoints.length - 1][0], 0]);
      } else if (!isEmpty && lastIsEmpty) {
        areaPoints.push([thisCoord, 0]);
        linePoints.push([thisCoord, 0]);
      }

      areaPoints.push([thisCoord, otherCoord]);
      linePoints.push([thisCoord, otherCoord]);
      thisCoord += step;
      lastIsEmpty = isEmpty;
    });
    var dataZoomModel = this.dataZoomModel; // var dataBackgroundModel = dataZoomModel.getModel('dataBackground');

    this._displayables.barGroup.add(new graphic.Polygon({
      shape: {
        points: areaPoints
      },
      style: zrUtil.defaults({
        fill: dataZoomModel.get('dataBackgroundColor')
      }, dataZoomModel.getModel('dataBackground.areaStyle').getAreaStyle()),
      silent: true,
      z2: -20
    }));

    this._displayables.barGroup.add(new graphic.Polyline({
      shape: {
        points: linePoints
      },
      style: dataZoomModel.getModel('dataBackground.lineStyle').getLineStyle(),
      silent: true,
      z2: -19
    }));
  },
  _prepareDataShadowInfo: function () {
    var dataZoomModel = this.dataZoomModel;
    var showDataShadow = dataZoomModel.get('showDataShadow');

    if (showDataShadow === false) {
      return;
    } // Find a representative series.


    var result;
    var ecModel = this.ecModel;
    dataZoomModel.eachTargetAxis(function (dimNames, axisIndex) {
      var seriesModels = dataZoomModel.getAxisProxy(dimNames.name, axisIndex).getTargetSeriesModels();
      zrUtil.each(seriesModels, function (seriesModel) {
        if (result) {
          return;
        }

        if (showDataShadow !== true && zrUtil.indexOf(SHOW_DATA_SHADOW_SERIES_TYPE, seriesModel.get('type')) < 0) {
          return;
        }

        var thisAxis = ecModel.getComponent(dimNames.axis, axisIndex).axis;
        var otherDim = getOtherDim(dimNames.name);
        var otherAxisInverse;
        var coordSys = seriesModel.coordinateSystem;

        if (otherDim != null && coordSys.getOtherAxis) {
          otherAxisInverse = coordSys.getOtherAxis(thisAxis).inverse;
        }

        otherDim = seriesModel.getData().mapDimension(otherDim);
        result = {
          thisAxis: thisAxis,
          series: seriesModel,
          thisDim: dimNames.name,
          otherDim: otherDim,
          otherAxisInverse: otherAxisInverse
        };
      }, this);
    }, this);
    return result;
  },
  _renderHandle: function () {
    var displaybles = this._displayables;
    var handles = displaybles.handles = [];
    var handleLabels = displaybles.handleLabels = [];
    var barGroup = this._displayables.barGroup;
    var size = this._size;
    var dataZoomModel = this.dataZoomModel;
    barGroup.add(displaybles.filler = new Rect({
      draggable: true,
      cursor: getCursor(this._orient),
      drift: bind(this._onDragMove, this, 'all'),
      onmousemove: function (e) {
        // Fot mobile devicem, prevent screen slider on the button.
        eventTool.stop(e.event);
      },
      ondragstart: bind(this._showDataInfo, this, true),
      ondragend: bind(this._onDragEnd, this),
      onmouseover: bind(this._showDataInfo, this, true),
      onmouseout: bind(this._showDataInfo, this, false),
      style: {
        fill: dataZoomModel.get('fillerColor'),
        textPosition: 'inside'
      }
    })); // Frame border.

    barGroup.add(new Rect({
      silent: true,
      subPixelOptimize: true,
      shape: {
        x: 0,
        y: 0,
        width: size[0],
        height: size[1]
      },
      style: {
        stroke: dataZoomModel.get('dataBackgroundColor') || dataZoomModel.get('borderColor'),
        lineWidth: DEFAULT_FRAME_BORDER_WIDTH,
        fill: 'rgba(0,0,0,0)'
      }
    }));
    each([0, 1], function (handleIndex) {
      var path = graphic.createIcon(dataZoomModel.get('handleIcon'), {
        cursor: getCursor(this._orient),
        draggable: true,
        drift: bind(this._onDragMove, this, handleIndex),
        onmousemove: function (e) {
          // Fot mobile devicem, prevent screen slider on the button.
          eventTool.stop(e.event);
        },
        ondragend: bind(this._onDragEnd, this),
        onmouseover: bind(this._showDataInfo, this, true),
        onmouseout: bind(this._showDataInfo, this, false)
      }, {
        x: -1,
        y: 0,
        width: 2,
        height: 2
      });
      var bRect = path.getBoundingRect();
      this._handleHeight = numberUtil.parsePercent(dataZoomModel.get('handleSize'), this._size[1]);
      this._handleWidth = bRect.width / bRect.height * this._handleHeight;
      path.setStyle(dataZoomModel.getModel('handleStyle').getItemStyle());
      var handleColor = dataZoomModel.get('handleColor'); // Compatitable with previous version

      if (handleColor != null) {
        path.style.fill = handleColor;
      }

      barGroup.add(handles[handleIndex] = path);
      var textStyleModel = dataZoomModel.textStyleModel;
      this.group.add(handleLabels[handleIndex] = new graphic.Text({
        silent: true,
        invisible: true,
        style: {
          x: 0,
          y: 0,
          text: '',
          textVerticalAlign: 'middle',
          textAlign: 'center',
          textFill: textStyleModel.getTextColor(),
          textFont: textStyleModel.getFont()
        },
        z2: 10
      }));
    }, this);
  },

  /**
   * @private
   */
  _resetInterval: function () {
    var range = this._range = this.dataZoomModel.getPercentRange();

    var viewExtent = this._getViewExtent();

    this._handleEnds = [linearMap(range[0], [0, 100], viewExtent, true), linearMap(range[1], [0, 100], viewExtent, true)];
  },

  /**
   * @private
   * @param {(number|string)} handleIndex 0 or 1 or 'all'
   * @param {number} delta
   * @return {boolean} changed
   */
  _updateInterval: function (handleIndex, delta) {
    var dataZoomModel = this.dataZoomModel;
    var handleEnds = this._handleEnds;

    var viewExtend = this._getViewExtent();

    var minMaxSpan = dataZoomModel.findRepresentativeAxisProxy().getMinMaxSpan();
    var percentExtent = [0, 100];
    sliderMove(delta, handleEnds, viewExtend, dataZoomModel.get('zoomLock') ? 'all' : handleIndex, minMaxSpan.minSpan != null ? linearMap(minMaxSpan.minSpan, percentExtent, viewExtend, true) : null, minMaxSpan.maxSpan != null ? linearMap(minMaxSpan.maxSpan, percentExtent, viewExtend, true) : null);
    var lastRange = this._range;
    var range = this._range = asc([linearMap(handleEnds[0], viewExtend, percentExtent, true), linearMap(handleEnds[1], viewExtend, percentExtent, true)]);
    return !lastRange || lastRange[0] !== range[0] || lastRange[1] !== range[1];
  },

  /**
   * @private
   */
  _updateView: function (nonRealtime) {
    var displaybles = this._displayables;
    var handleEnds = this._handleEnds;
    var handleInterval = asc(handleEnds.slice());
    var size = this._size;
    each([0, 1], function (handleIndex) {
      // Handles
      var handle = displaybles.handles[handleIndex];
      var handleHeight = this._handleHeight;
      handle.attr({
        scale: [handleHeight / 2, handleHeight / 2],
        position: [handleEnds[handleIndex], size[1] / 2 - handleHeight / 2]
      });
    }, this); // Filler

    displaybles.filler.setShape({
      x: handleInterval[0],
      y: 0,
      width: handleInterval[1] - handleInterval[0],
      height: size[1]
    });

    this._updateDataInfo(nonRealtime);
  },

  /**
   * @private
   */
  _updateDataInfo: function (nonRealtime) {
    var dataZoomModel = this.dataZoomModel;
    var displaybles = this._displayables;
    var handleLabels = displaybles.handleLabels;
    var orient = this._orient;
    var labelTexts = ['', '']; // FIXME
    // date型，支持formatter，autoformatter（ec2 date.getAutoFormatter）

    if (dataZoomModel.get('showDetail')) {
      var axisProxy = dataZoomModel.findRepresentativeAxisProxy();

      if (axisProxy) {
        var axis = axisProxy.getAxisModel().axis;
        var range = this._range;
        var dataInterval = nonRealtime // See #4434, data and axis are not processed and reset yet in non-realtime mode.
        ? axisProxy.calculateDataWindow({
          start: range[0],
          end: range[1]
        }).valueWindow : axisProxy.getDataValueWindow();
        labelTexts = [this._formatLabel(dataInterval[0], axis), this._formatLabel(dataInterval[1], axis)];
      }
    }

    var orderedHandleEnds = asc(this._handleEnds.slice());
    setLabel.call(this, 0);
    setLabel.call(this, 1);

    function setLabel(handleIndex) {
      // Label
      // Text should not transform by barGroup.
      // Ignore handlers transform
      var barTransform = graphic.getTransform(displaybles.handles[handleIndex].parent, this.group);
      var direction = graphic.transformDirection(handleIndex === 0 ? 'right' : 'left', barTransform);
      var offset = this._handleWidth / 2 + LABEL_GAP;
      var textPoint = graphic.applyTransform([orderedHandleEnds[handleIndex] + (handleIndex === 0 ? -offset : offset), this._size[1] / 2], barTransform);
      handleLabels[handleIndex].setStyle({
        x: textPoint[0],
        y: textPoint[1],
        textVerticalAlign: orient === HORIZONTAL ? 'middle' : direction,
        textAlign: orient === HORIZONTAL ? direction : 'center',
        text: labelTexts[handleIndex]
      });
    }
  },

  /**
   * @private
   */
  _formatLabel: function (value, axis) {
    var dataZoomModel = this.dataZoomModel;
    var labelFormatter = dataZoomModel.get('labelFormatter');
    var labelPrecision = dataZoomModel.get('labelPrecision');

    if (labelPrecision == null || labelPrecision === 'auto') {
      labelPrecision = axis.getPixelPrecision();
    }

    var valueStr = value == null || isNaN(value) ? '' // FIXME Glue code
    : axis.type === 'category' || axis.type === 'time' ? axis.scale.getLabel(Math.round(value)) // param of toFixed should less then 20.
    : value.toFixed(Math.min(labelPrecision, 20));
    return zrUtil.isFunction(labelFormatter) ? labelFormatter(value, valueStr) : zrUtil.isString(labelFormatter) ? labelFormatter.replace('{value}', valueStr) : valueStr;
  },

  /**
   * @private
   * @param {boolean} showOrHide true: show, false: hide
   */
  _showDataInfo: function (showOrHide) {
    // Always show when drgging.
    showOrHide = this._dragging || showOrHide;
    var handleLabels = this._displayables.handleLabels;
    handleLabels[0].attr('invisible', !showOrHide);
    handleLabels[1].attr('invisible', !showOrHide);
  },
  _onDragMove: function (handleIndex, dx, dy) {
    this._dragging = true; // Transform dx, dy to bar coordination.

    var barTransform = this._displayables.barGroup.getLocalTransform();

    var vertex = graphic.applyTransform([dx, dy], barTransform, true);

    var changed = this._updateInterval(handleIndex, vertex[0]);

    var realtime = this.dataZoomModel.get('realtime');

    this._updateView(!realtime); // Avoid dispatch dataZoom repeatly but range not changed,
    // which cause bad visual effect when progressive enabled.


    changed && realtime && this._dispatchZoomAction();
  },
  _onDragEnd: function () {
    this._dragging = false;

    this._showDataInfo(false); // While in realtime mode and stream mode, dispatch action when
    // drag end will cause the whole view rerender, which is unnecessary.


    var realtime = this.dataZoomModel.get('realtime');
    !realtime && this._dispatchZoomAction();
  },
  _onClickPanelClick: function (e) {
    var size = this._size;

    var localPoint = this._displayables.barGroup.transformCoordToLocal(e.offsetX, e.offsetY);

    if (localPoint[0] < 0 || localPoint[0] > size[0] || localPoint[1] < 0 || localPoint[1] > size[1]) {
      return;
    }

    var handleEnds = this._handleEnds;
    var center = (handleEnds[0] + handleEnds[1]) / 2;

    var changed = this._updateInterval('all', localPoint[0] - center);

    this._updateView();

    changed && this._dispatchZoomAction();
  },

  /**
   * This action will be throttled.
   * @private
   */
  _dispatchZoomAction: function () {
    var range = this._range;
    this.api.dispatchAction({
      type: 'dataZoom',
      from: this.uid,
      dataZoomId: this.dataZoomModel.id,
      start: range[0],
      end: range[1]
    });
  },

  /**
   * @private
   */
  _findCoordRect: function () {
    // Find the grid coresponding to the first axis referred by dataZoom.
    var rect;
    each(this.getTargetCoordInfo(), function (coordInfoList) {
      if (!rect && coordInfoList.length) {
        var coordSys = coordInfoList[0].model.coordinateSystem;
        rect = coordSys.getRect && coordSys.getRect();
      }
    });

    if (!rect) {
      var width = this.api.getWidth();
      var height = this.api.getHeight();
      rect = {
        x: width * 0.2,
        y: height * 0.2,
        width: width * 0.6,
        height: height * 0.6
      };
    }

    return rect;
  }
});

function getOtherDim(thisDim) {
  // FIXME
  // 这个逻辑和getOtherAxis里一致，但是写在这里是否不好
  var map = {
    x: 'y',
    y: 'x',
    radius: 'angle',
    angle: 'radius'
  };
  return map[thisDim];
}

function getCursor(orient) {
  return orient === 'vertical' ? 'ns-resize' : 'ew-resize';
}

export default SliderZoomView;