public/en/builder/src/echarts/component/timeline/SliderTimelineView.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 BoundingRect from 'zrender/src/core/BoundingRect';
import * as matrix from 'zrender/src/core/matrix';
import * as graphic from '../../util/graphic';
import * as layout from '../../util/layout';
import TimelineView from './TimelineView';
import TimelineAxis from './TimelineAxis';
import { createSymbol } from '../../util/symbol';
import * as axisHelper from '../../coord/axisHelper';
import * as numberUtil from '../../util/number';
import { encodeHTML } from '../../util/format';
var bind = zrUtil.bind;
var each = zrUtil.each;
var PI = Math.PI;
export default TimelineView.extend({
  type: 'timeline.slider',
  init: function (ecModel, api) {
    this.api = api;
    /**
     * @private
     * @type {module:echarts/component/timeline/TimelineAxis}
     */

    this._axis;
    /**
     * @private
     * @type {module:zrender/core/BoundingRect}
     */

    this._viewRect;
    /**
     * @type {number}
     */

    this._timer;
    /**
     * @type {module:zrender/Element}
     */

    this._currentPointer;
    /**
     * @type {module:zrender/container/Group}
     */

    this._mainGroup;
    /**
     * @type {module:zrender/container/Group}
     */

    this._labelGroup;
  },

  /**
   * @override
   */
  render: function (timelineModel, ecModel, api, payload) {
    this.model = timelineModel;
    this.api = api;
    this.ecModel = ecModel;
    this.group.removeAll();

    if (timelineModel.get('show', true)) {
      var layoutInfo = this._layout(timelineModel, api);

      var mainGroup = this._createGroup('mainGroup');

      var labelGroup = this._createGroup('labelGroup');
      /**
       * @private
       * @type {module:echarts/component/timeline/TimelineAxis}
       */


      var axis = this._axis = this._createAxis(layoutInfo, timelineModel);

      timelineModel.formatTooltip = function (dataIndex) {
        return encodeHTML(axis.scale.getLabel(dataIndex));
      };

      each(['AxisLine', 'AxisTick', 'Control', 'CurrentPointer'], function (name) {
        this['_render' + name](layoutInfo, mainGroup, axis, timelineModel);
      }, this);

      this._renderAxisLabel(layoutInfo, labelGroup, axis, timelineModel);

      this._position(layoutInfo, timelineModel);
    }

    this._doPlayStop();
  },

  /**
   * @override
   */
  remove: function () {
    this._clearTimer();

    this.group.removeAll();
  },

  /**
   * @override
   */
  dispose: function () {
    this._clearTimer();
  },
  _layout: function (timelineModel, api) {
    var labelPosOpt = timelineModel.get('label.position');
    var orient = timelineModel.get('orient');
    var viewRect = getViewRect(timelineModel, api); // Auto label offset.

    if (labelPosOpt == null || labelPosOpt === 'auto') {
      labelPosOpt = orient === 'horizontal' ? viewRect.y + viewRect.height / 2 < api.getHeight() / 2 ? '-' : '+' : viewRect.x + viewRect.width / 2 < api.getWidth() / 2 ? '+' : '-';
    } else if (isNaN(labelPosOpt)) {
      labelPosOpt = {
        horizontal: {
          top: '-',
          bottom: '+'
        },
        vertical: {
          left: '-',
          right: '+'
        }
      }[orient][labelPosOpt];
    }

    var labelAlignMap = {
      horizontal: 'center',
      vertical: labelPosOpt >= 0 || labelPosOpt === '+' ? 'left' : 'right'
    };
    var labelBaselineMap = {
      horizontal: labelPosOpt >= 0 || labelPosOpt === '+' ? 'top' : 'bottom',
      vertical: 'middle'
    };
    var rotationMap = {
      horizontal: 0,
      vertical: PI / 2
    }; // Position

    var mainLength = orient === 'vertical' ? viewRect.height : viewRect.width;
    var controlModel = timelineModel.getModel('controlStyle');
    var showControl = controlModel.get('show', true);
    var controlSize = showControl ? controlModel.get('itemSize') : 0;
    var controlGap = showControl ? controlModel.get('itemGap') : 0;
    var sizePlusGap = controlSize + controlGap; // Special label rotate.

    var labelRotation = timelineModel.get('label.rotate') || 0;
    labelRotation = labelRotation * PI / 180; // To radian.

    var playPosition;
    var prevBtnPosition;
    var nextBtnPosition;
    var axisExtent;
    var controlPosition = controlModel.get('position', true);
    var showPlayBtn = showControl && controlModel.get('showPlayBtn', true);
    var showPrevBtn = showControl && controlModel.get('showPrevBtn', true);
    var showNextBtn = showControl && controlModel.get('showNextBtn', true);
    var xLeft = 0;
    var xRight = mainLength; // position[0] means left, position[1] means middle.

    if (controlPosition === 'left' || controlPosition === 'bottom') {
      showPlayBtn && (playPosition = [0, 0], xLeft += sizePlusGap);
      showPrevBtn && (prevBtnPosition = [xLeft, 0], xLeft += sizePlusGap);
      showNextBtn && (nextBtnPosition = [xRight - controlSize, 0], xRight -= sizePlusGap);
    } else {
      // 'top' 'right'
      showPlayBtn && (playPosition = [xRight - controlSize, 0], xRight -= sizePlusGap);
      showPrevBtn && (prevBtnPosition = [0, 0], xLeft += sizePlusGap);
      showNextBtn && (nextBtnPosition = [xRight - controlSize, 0], xRight -= sizePlusGap);
    }

    axisExtent = [xLeft, xRight];

    if (timelineModel.get('inverse')) {
      axisExtent.reverse();
    }

    return {
      viewRect: viewRect,
      mainLength: mainLength,
      orient: orient,
      rotation: rotationMap[orient],
      labelRotation: labelRotation,
      labelPosOpt: labelPosOpt,
      labelAlign: timelineModel.get('label.align') || labelAlignMap[orient],
      labelBaseline: timelineModel.get('label.verticalAlign') || timelineModel.get('label.baseline') || labelBaselineMap[orient],
      // Based on mainGroup.
      playPosition: playPosition,
      prevBtnPosition: prevBtnPosition,
      nextBtnPosition: nextBtnPosition,
      axisExtent: axisExtent,
      controlSize: controlSize,
      controlGap: controlGap
    };
  },
  _position: function (layoutInfo, timelineModel) {
    // Position is be called finally, because bounding rect is needed for
    // adapt content to fill viewRect (auto adapt offset).
    // Timeline may be not all in the viewRect when 'offset' is specified
    // as a number, because it is more appropriate that label aligns at
    // 'offset' but not the other edge defined by viewRect.
    var mainGroup = this._mainGroup;
    var labelGroup = this._labelGroup;
    var viewRect = layoutInfo.viewRect;

    if (layoutInfo.orient === 'vertical') {
      // transform to horizontal, inverse rotate by left-top point.
      var m = matrix.create();
      var rotateOriginX = viewRect.x;
      var rotateOriginY = viewRect.y + viewRect.height;
      matrix.translate(m, m, [-rotateOriginX, -rotateOriginY]);
      matrix.rotate(m, m, -PI / 2);
      matrix.translate(m, m, [rotateOriginX, rotateOriginY]);
      viewRect = viewRect.clone();
      viewRect.applyTransform(m);
    }

    var viewBound = getBound(viewRect);
    var mainBound = getBound(mainGroup.getBoundingRect());
    var labelBound = getBound(labelGroup.getBoundingRect());
    var mainPosition = mainGroup.position;
    var labelsPosition = labelGroup.position;
    labelsPosition[0] = mainPosition[0] = viewBound[0][0];
    var labelPosOpt = layoutInfo.labelPosOpt;

    if (isNaN(labelPosOpt)) {
      // '+' or '-'
      var mainBoundIdx = labelPosOpt === '+' ? 0 : 1;
      toBound(mainPosition, mainBound, viewBound, 1, mainBoundIdx);
      toBound(labelsPosition, labelBound, viewBound, 1, 1 - mainBoundIdx);
    } else {
      var mainBoundIdx = labelPosOpt >= 0 ? 0 : 1;
      toBound(mainPosition, mainBound, viewBound, 1, mainBoundIdx);
      labelsPosition[1] = mainPosition[1] + labelPosOpt;
    }

    mainGroup.attr('position', mainPosition);
    labelGroup.attr('position', labelsPosition);
    mainGroup.rotation = labelGroup.rotation = layoutInfo.rotation;
    setOrigin(mainGroup);
    setOrigin(labelGroup);

    function setOrigin(targetGroup) {
      var pos = targetGroup.position;
      targetGroup.origin = [viewBound[0][0] - pos[0], viewBound[1][0] - pos[1]];
    }

    function getBound(rect) {
      // [[xmin, xmax], [ymin, ymax]]
      return [[rect.x, rect.x + rect.width], [rect.y, rect.y + rect.height]];
    }

    function toBound(fromPos, from, to, dimIdx, boundIdx) {
      fromPos[dimIdx] += to[dimIdx][boundIdx] - from[dimIdx][boundIdx];
    }
  },
  _createAxis: function (layoutInfo, timelineModel) {
    var data = timelineModel.getData();
    var axisType = timelineModel.get('axisType');
    var scale = axisHelper.createScaleByModel(timelineModel, axisType); // Customize scale. The `tickValue` is `dataIndex`.

    scale.getTicks = function () {
      return data.mapArray(['value'], function (value) {
        return value;
      });
    };

    var dataExtent = data.getDataExtent('value');
    scale.setExtent(dataExtent[0], dataExtent[1]);
    scale.niceTicks();
    var axis = new TimelineAxis('value', scale, layoutInfo.axisExtent, axisType);
    axis.model = timelineModel;
    return axis;
  },
  _createGroup: function (name) {
    var newGroup = this['_' + name] = new graphic.Group();
    this.group.add(newGroup);
    return newGroup;
  },
  _renderAxisLine: function (layoutInfo, group, axis, timelineModel) {
    var axisExtent = axis.getExtent();

    if (!timelineModel.get('lineStyle.show')) {
      return;
    }

    group.add(new graphic.Line({
      shape: {
        x1: axisExtent[0],
        y1: 0,
        x2: axisExtent[1],
        y2: 0
      },
      style: zrUtil.extend({
        lineCap: 'round'
      }, timelineModel.getModel('lineStyle').getLineStyle()),
      silent: true,
      z2: 1
    }));
  },

  /**
   * @private
   */
  _renderAxisTick: function (layoutInfo, group, axis, timelineModel) {
    var data = timelineModel.getData(); // Show all ticks, despite ignoring strategy.

    var ticks = axis.scale.getTicks(); // The value is dataIndex, see the costomized scale.

    each(ticks, function (value) {
      var tickCoord = axis.dataToCoord(value);
      var itemModel = data.getItemModel(value);
      var itemStyleModel = itemModel.getModel('itemStyle');
      var hoverStyleModel = itemModel.getModel('emphasis.itemStyle');
      var symbolOpt = {
        position: [tickCoord, 0],
        onclick: bind(this._changeTimeline, this, value)
      };
      var el = giveSymbol(itemModel, itemStyleModel, group, symbolOpt);
      graphic.setHoverStyle(el, hoverStyleModel.getItemStyle());

      if (itemModel.get('tooltip')) {
        el.dataIndex = value;
        el.dataModel = timelineModel;
      } else {
        el.dataIndex = el.dataModel = null;
      }
    }, this);
  },

  /**
   * @private
   */
  _renderAxisLabel: function (layoutInfo, group, axis, timelineModel) {
    var labelModel = axis.getLabelModel();

    if (!labelModel.get('show')) {
      return;
    }

    var data = timelineModel.getData();
    var labels = axis.getViewLabels();
    each(labels, function (labelItem) {
      // The tickValue is dataIndex, see the costomized scale.
      var dataIndex = labelItem.tickValue;
      var itemModel = data.getItemModel(dataIndex);
      var normalLabelModel = itemModel.getModel('label');
      var hoverLabelModel = itemModel.getModel('emphasis.label');
      var tickCoord = axis.dataToCoord(labelItem.tickValue);
      var textEl = new graphic.Text({
        position: [tickCoord, 0],
        rotation: layoutInfo.labelRotation - layoutInfo.rotation,
        onclick: bind(this._changeTimeline, this, dataIndex),
        silent: false
      });
      graphic.setTextStyle(textEl.style, normalLabelModel, {
        text: labelItem.formattedLabel,
        textAlign: layoutInfo.labelAlign,
        textVerticalAlign: layoutInfo.labelBaseline
      });
      group.add(textEl);
      graphic.setHoverStyle(textEl, graphic.setTextStyle({}, hoverLabelModel));
    }, this);
  },

  /**
   * @private
   */
  _renderControl: function (layoutInfo, group, axis, timelineModel) {
    var controlSize = layoutInfo.controlSize;
    var rotation = layoutInfo.rotation;
    var itemStyle = timelineModel.getModel('controlStyle').getItemStyle();
    var hoverStyle = timelineModel.getModel('emphasis.controlStyle').getItemStyle();
    var rect = [0, -controlSize / 2, controlSize, controlSize];
    var playState = timelineModel.getPlayState();
    var inverse = timelineModel.get('inverse', true);
    makeBtn(layoutInfo.nextBtnPosition, 'controlStyle.nextIcon', bind(this._changeTimeline, this, inverse ? '-' : '+'));
    makeBtn(layoutInfo.prevBtnPosition, 'controlStyle.prevIcon', bind(this._changeTimeline, this, inverse ? '+' : '-'));
    makeBtn(layoutInfo.playPosition, 'controlStyle.' + (playState ? 'stopIcon' : 'playIcon'), bind(this._handlePlayClick, this, !playState), true);

    function makeBtn(position, iconPath, onclick, willRotate) {
      if (!position) {
        return;
      }

      var opt = {
        position: position,
        origin: [controlSize / 2, 0],
        rotation: willRotate ? -rotation : 0,
        rectHover: true,
        style: itemStyle,
        onclick: onclick
      };
      var btn = makeIcon(timelineModel, iconPath, rect, opt);
      group.add(btn);
      graphic.setHoverStyle(btn, hoverStyle);
    }
  },
  _renderCurrentPointer: function (layoutInfo, group, axis, timelineModel) {
    var data = timelineModel.getData();
    var currentIndex = timelineModel.getCurrentIndex();
    var pointerModel = data.getItemModel(currentIndex).getModel('checkpointStyle');
    var me = this;
    var callback = {
      onCreate: function (pointer) {
        pointer.draggable = true;
        pointer.drift = bind(me._handlePointerDrag, me);
        pointer.ondragend = bind(me._handlePointerDragend, me);
        pointerMoveTo(pointer, currentIndex, axis, timelineModel, true);
      },
      onUpdate: function (pointer) {
        pointerMoveTo(pointer, currentIndex, axis, timelineModel);
      }
    }; // Reuse when exists, for animation and drag.

    this._currentPointer = giveSymbol(pointerModel, pointerModel, this._mainGroup, {}, this._currentPointer, callback);
  },
  _handlePlayClick: function (nextState) {
    this._clearTimer();

    this.api.dispatchAction({
      type: 'timelinePlayChange',
      playState: nextState,
      from: this.uid
    });
  },
  _handlePointerDrag: function (dx, dy, e) {
    this._clearTimer();

    this._pointerChangeTimeline([e.offsetX, e.offsetY]);
  },
  _handlePointerDragend: function (e) {
    this._pointerChangeTimeline([e.offsetX, e.offsetY], true);
  },
  _pointerChangeTimeline: function (mousePos, trigger) {
    var toCoord = this._toAxisCoord(mousePos)[0];

    var axis = this._axis;
    var axisExtent = numberUtil.asc(axis.getExtent().slice());
    toCoord > axisExtent[1] && (toCoord = axisExtent[1]);
    toCoord < axisExtent[0] && (toCoord = axisExtent[0]);
    this._currentPointer.position[0] = toCoord;

    this._currentPointer.dirty();

    var targetDataIndex = this._findNearestTick(toCoord);

    var timelineModel = this.model;

    if (trigger || targetDataIndex !== timelineModel.getCurrentIndex() && timelineModel.get('realtime')) {
      this._changeTimeline(targetDataIndex);
    }
  },
  _doPlayStop: function () {
    this._clearTimer();

    if (this.model.getPlayState()) {
      this._timer = setTimeout(bind(handleFrame, this), this.model.get('playInterval'));
    }

    function handleFrame() {
      // Do not cache
      var timelineModel = this.model;

      this._changeTimeline(timelineModel.getCurrentIndex() + (timelineModel.get('rewind', true) ? -1 : 1));
    }
  },
  _toAxisCoord: function (vertex) {
    var trans = this._mainGroup.getLocalTransform();

    return graphic.applyTransform(vertex, trans, true);
  },
  _findNearestTick: function (axisCoord) {
    var data = this.model.getData();
    var dist = Infinity;
    var targetDataIndex;
    var axis = this._axis;
    data.each(['value'], function (value, dataIndex) {
      var coord = axis.dataToCoord(value);
      var d = Math.abs(coord - axisCoord);

      if (d < dist) {
        dist = d;
        targetDataIndex = dataIndex;
      }
    });
    return targetDataIndex;
  },
  _clearTimer: function () {
    if (this._timer) {
      clearTimeout(this._timer);
      this._timer = null;
    }
  },
  _changeTimeline: function (nextIndex) {
    var currentIndex = this.model.getCurrentIndex();

    if (nextIndex === '+') {
      nextIndex = currentIndex + 1;
    } else if (nextIndex === '-') {
      nextIndex = currentIndex - 1;
    }

    this.api.dispatchAction({
      type: 'timelineChange',
      currentIndex: nextIndex,
      from: this.uid
    });
  }
});

function getViewRect(model, api) {
  return layout.getLayoutRect(model.getBoxLayoutParams(), {
    width: api.getWidth(),
    height: api.getHeight()
  }, model.get('padding'));
}

function makeIcon(timelineModel, objPath, rect, opts) {
  var icon = graphic.makePath(timelineModel.get(objPath).replace(/^path:\/\//, ''), zrUtil.clone(opts || {}), new BoundingRect(rect[0], rect[1], rect[2], rect[3]), 'center');
  return icon;
}
/**
 * Create symbol or update symbol
 * opt: basic position and event handlers
 */


function giveSymbol(hostModel, itemStyleModel, group, opt, symbol, callback) {
  var color = itemStyleModel.get('color');

  if (!symbol) {
    var symbolType = hostModel.get('symbol');
    symbol = createSymbol(symbolType, -1, -1, 2, 2, color);
    symbol.setStyle('strokeNoScale', true);
    group.add(symbol);
    callback && callback.onCreate(symbol);
  } else {
    symbol.setColor(color);
    group.add(symbol); // Group may be new, also need to add.

    callback && callback.onUpdate(symbol);
  } // Style


  var itemStyle = itemStyleModel.getItemStyle(['color', 'symbol', 'symbolSize']);
  symbol.setStyle(itemStyle); // Transform and events.

  opt = zrUtil.merge({
    rectHover: true,
    z2: 100
  }, opt, true);
  var symbolSize = hostModel.get('symbolSize');
  symbolSize = symbolSize instanceof Array ? symbolSize.slice() : [+symbolSize, +symbolSize];
  symbolSize[0] /= 2;
  symbolSize[1] /= 2;
  opt.scale = symbolSize;
  var symbolOffset = hostModel.get('symbolOffset');

  if (symbolOffset) {
    var pos = opt.position = opt.position || [0, 0];
    pos[0] += numberUtil.parsePercent(symbolOffset[0], symbolSize[0]);
    pos[1] += numberUtil.parsePercent(symbolOffset[1], symbolSize[1]);
  }

  var symbolRotate = hostModel.get('symbolRotate');
  opt.rotation = (symbolRotate || 0) * Math.PI / 180 || 0;
  symbol.attr(opt); // FIXME
  // (1) When symbol.style.strokeNoScale is true and updateTransform is not performed,
  // getBoundingRect will return wrong result.
  // (This is supposed to be resolved in zrender, but it is a little difficult to
  // leverage performance and auto updateTransform)
  // (2) All of ancesters of symbol do not scale, so we can just updateTransform symbol.

  symbol.updateTransform();
  return symbol;
}

function pointerMoveTo(pointer, dataIndex, axis, timelineModel, noAnimation) {
  if (pointer.dragging) {
    return;
  }

  var pointerModel = timelineModel.getModel('checkpointStyle');
  var toCoord = axis.dataToCoord(timelineModel.getData().get(['value'], dataIndex));

  if (noAnimation || !pointerModel.get('animation', true)) {
    pointer.attr({
      position: [toCoord, 0]
    });
  } else {
    pointer.stopAnimation(true);
    pointer.animateTo({
      position: [toCoord, 0]
    }, pointerModel.get('animationDuration', true), pointerModel.get('animationEasing', true));
  }
}