zh/builder/src/echarts3/component/helper/RoamController.js

import * as zrUtil from 'zrender/src/core/util';
import Eventful from 'zrender/src/mixin/Eventful';
import * as eventTool from 'zrender/src/core/event';
import * as interactionMutex from './interactionMutex';
/**
 * @alias module:echarts/component/helper/RoamController
 * @constructor
 * @mixin {module:zrender/mixin/Eventful}
 *
 * @param {module:zrender/zrender~ZRender} zr
 */

function RoamController(zr) {
  /**
   * @type {Function}
   */
  this.pointerChecker;
  /**
   * @type {module:zrender}
   */

  this._zr = zr;
  /**
   * @type {Object}
   */

  this._opt = {}; // Avoid two roamController bind the same handler

  var bind = zrUtil.bind;
  var mousedownHandler = bind(mousedown, this);
  var mousemoveHandler = bind(mousemove, this);
  var mouseupHandler = bind(mouseup, this);
  var mousewheelHandler = bind(mousewheel, this);
  var pinchHandler = bind(pinch, this);
  Eventful.call(this);
  /**
   * @param {Function} pointerChecker
   *                   input: x, y
   *                   output: boolean
   */

  this.setPointerChecker = function (pointerChecker) {
    this.pointerChecker = pointerChecker;
  };
  /**
   * Notice: only enable needed types. For example, if 'zoom'
   * is not needed, 'zoom' should not be enabled, otherwise
   * default mousewheel behaviour (scroll page) will be disabled.
   *
   * @param  {boolean|string} [controlType=true] Specify the control type,
   *                          which can be null/undefined or true/false
   *                          or 'pan/move' or 'zoom'/'scale'
   * @param {Object} [opt]
   * @param {Object} [opt.zoomOnMouseWheel=true]
   * @param {Object} [opt.moveOnMouseMove=true]
   * @param {Object} [opt.preventDefaultMouseMove=true] When pan.
   */


  this.enable = function (controlType, opt) {
    // Disable previous first
    this.disable();
    this._opt = zrUtil.defaults(zrUtil.clone(opt) || {}, {
      zoomOnMouseWheel: true,
      moveOnMouseMove: true,
      preventDefaultMouseMove: true
    });

    if (controlType == null) {
      controlType = true;
    }

    if (controlType === true || controlType === 'move' || controlType === 'pan') {
      zr.on('mousedown', mousedownHandler);
      zr.on('mousemove', mousemoveHandler);
      zr.on('mouseup', mouseupHandler);
    }

    if (controlType === true || controlType === 'scale' || controlType === 'zoom') {
      zr.on('mousewheel', mousewheelHandler);
      zr.on('pinch', pinchHandler);
    }
  };

  this.disable = function () {
    zr.off('mousedown', mousedownHandler);
    zr.off('mousemove', mousemoveHandler);
    zr.off('mouseup', mouseupHandler);
    zr.off('mousewheel', mousewheelHandler);
    zr.off('pinch', pinchHandler);
  };

  this.dispose = this.disable;

  this.isDragging = function () {
    return this._dragging;
  };

  this.isPinching = function () {
    return this._pinching;
  };
}

zrUtil.mixin(RoamController, Eventful);

function mousedown(e) {
  if (eventTool.notLeftMouse(e) || e.target && e.target.draggable) {
    return;
  }

  var x = e.offsetX;
  var y = e.offsetY; // Only check on mosedown, but not mousemove.
  // Mouse can be out of target when mouse moving.

  if (this.pointerChecker && this.pointerChecker(e, x, y)) {
    this._x = x;
    this._y = y;
    this._dragging = true;
  }
}

function mousemove(e) {
  if (eventTool.notLeftMouse(e) || !checkKeyBinding(this, 'moveOnMouseMove', e) || !this._dragging || e.gestureEvent === 'pinch' || interactionMutex.isTaken(this._zr, 'globalPan')) {
    return;
  }

  var x = e.offsetX;
  var y = e.offsetY;
  var oldX = this._x;
  var oldY = this._y;
  var dx = x - oldX;
  var dy = y - oldY;
  this._x = x;
  this._y = y;
  this._opt.preventDefaultMouseMove && eventTool.stop(e.event);
  this.trigger('pan', dx, dy, oldX, oldY, x, y);
}

function mouseup(e) {
  if (!eventTool.notLeftMouse(e)) {
    this._dragging = false;
  }
}

function mousewheel(e) {
  // wheelDelta maybe -0 in chrome mac.
  if (!checkKeyBinding(this, 'zoomOnMouseWheel', e) || e.wheelDelta === 0) {
    return;
  } // Convenience:
  // Mac and VM Windows on Mac: scroll up: zoom out.
  // Windows: scroll up: zoom in.


  var zoomDelta = e.wheelDelta > 0 ? 1.1 : 1 / 1.1;
  zoom.call(this, e, zoomDelta, e.offsetX, e.offsetY);
}

function pinch(e) {
  if (interactionMutex.isTaken(this._zr, 'globalPan')) {
    return;
  }

  var zoomDelta = e.pinchScale > 1 ? 1.1 : 1 / 1.1;
  zoom.call(this, e, zoomDelta, e.pinchX, e.pinchY);
}

function zoom(e, zoomDelta, zoomX, zoomY) {
  if (this.pointerChecker && this.pointerChecker(e, zoomX, zoomY)) {
    // When mouse is out of roamController rect,
    // default befavoius should not be be disabled, otherwise
    // page sliding is disabled, contrary to expectation.
    eventTool.stop(e.event);
    this.trigger('zoom', zoomDelta, zoomX, zoomY);
  }
}

function checkKeyBinding(roamController, prop, e) {
  var setting = roamController._opt[prop];
  return setting && (!zrUtil.isString(setting) || e.event[setting + 'Key']);
}

export default RoamController;