source: node_modules/d3-drag/dist/d3-drag.js@ e4c61dd

// https://d3js.org/d3-drag/ v3.0.0 Copyright 2010-2021 Mike Bostock
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('d3-dispatch'), require('d3-selection')) :
typeof define === 'function' && define.amd ? define(['exports', 'd3-dispatch', 'd3-selection'], factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.d3 = global.d3 || {}, global.d3, global.d3));
}(this, (function (exports, d3Dispatch, d3Selection) { 'use strict';

// These are typically used in conjunction with noevent to ensure that we can
// preventDefault on the event.
const nonpassive = {passive: false};
const nonpassivecapture = {capture: true, passive: false};

function nopropagation(event) {
  event.stopImmediatePropagation();
}

function noevent(event) {
  event.preventDefault();
  event.stopImmediatePropagation();
}

function nodrag(view) {
  var root = view.document.documentElement,
      selection = d3Selection.select(view).on("dragstart.drag", noevent, nonpassivecapture);
  if ("onselectstart" in root) {
    selection.on("selectstart.drag", noevent, nonpassivecapture);
  } else {
    root.__noselect = root.style.MozUserSelect;
    root.style.MozUserSelect = "none";
  }
}

function yesdrag(view, noclick) {
  var root = view.document.documentElement,
      selection = d3Selection.select(view).on("dragstart.drag", null);
  if (noclick) {
    selection.on("click.drag", noevent, nonpassivecapture);
    setTimeout(function() { selection.on("click.drag", null); }, 0);
  }
  if ("onselectstart" in root) {
    selection.on("selectstart.drag", null);
  } else {
    root.style.MozUserSelect = root.__noselect;
    delete root.__noselect;
  }
}

var constant = x => () => x;

function DragEvent(type, {
  sourceEvent,
  subject,
  target,
  identifier,
  active,
  x, y, dx, dy,
  dispatch
}) {
  Object.defineProperties(this, {
    type: {value: type, enumerable: true, configurable: true},
    sourceEvent: {value: sourceEvent, enumerable: true, configurable: true},
    subject: {value: subject, enumerable: true, configurable: true},
    target: {value: target, enumerable: true, configurable: true},
    identifier: {value: identifier, enumerable: true, configurable: true},
    active: {value: active, enumerable: true, configurable: true},
    x: {value: x, enumerable: true, configurable: true},
    y: {value: y, enumerable: true, configurable: true},
    dx: {value: dx, enumerable: true, configurable: true},
    dy: {value: dy, enumerable: true, configurable: true},
    _: {value: dispatch}
  });
}

DragEvent.prototype.on = function() {
  var value = this._.on.apply(this._, arguments);
  return value === this._ ? this : value;
};

// Ignore right-click, since that should open the context menu.
function defaultFilter(event) {
  return !event.ctrlKey && !event.button;
}

function defaultContainer() {
  return this.parentNode;
}

function defaultSubject(event, d) {
  return d == null ? {x: event.x, y: event.y} : d;
}

function defaultTouchable() {
  return navigator.maxTouchPoints || ("ontouchstart" in this);
}

function drag() {
  var filter = defaultFilter,
      container = defaultContainer,
      subject = defaultSubject,
      touchable = defaultTouchable,
      gestures = {},
      listeners = d3Dispatch.dispatch("start", "drag", "end"),
      active = 0,
      mousedownx,
      mousedowny,
      mousemoving,
      touchending,
      clickDistance2 = 0;

  function drag(selection) {
    selection
        .on("mousedown.drag", mousedowned)
      .filter(touchable)
        .on("touchstart.drag", touchstarted)
        .on("touchmove.drag", touchmoved, nonpassive)
        .on("touchend.drag touchcancel.drag", touchended)
        .style("touch-action", "none")
        .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
  }

  function mousedowned(event, d) {
    if (touchending || !filter.call(this, event, d)) return;
    var gesture = beforestart(this, container.call(this, event, d), event, d, "mouse");
    if (!gesture) return;
    d3Selection.select(event.view)
      .on("mousemove.drag", mousemoved, nonpassivecapture)
      .on("mouseup.drag", mouseupped, nonpassivecapture);
    nodrag(event.view);
    nopropagation(event);
    mousemoving = false;
    mousedownx = event.clientX;
    mousedowny = event.clientY;
    gesture("start", event);
  }

  function mousemoved(event) {
    noevent(event);
    if (!mousemoving) {
      var dx = event.clientX - mousedownx, dy = event.clientY - mousedowny;
      mousemoving = dx * dx + dy * dy > clickDistance2;
    }
    gestures.mouse("drag", event);
  }

  function mouseupped(event) {
    d3Selection.select(event.view).on("mousemove.drag mouseup.drag", null);
    yesdrag(event.view, mousemoving);
    noevent(event);
    gestures.mouse("end", event);
  }

  function touchstarted(event, d) {
    if (!filter.call(this, event, d)) return;
    var touches = event.changedTouches,
        c = container.call(this, event, d),
        n = touches.length, i, gesture;

    for (i = 0; i < n; ++i) {
      if (gesture = beforestart(this, c, event, d, touches[i].identifier, touches[i])) {
        nopropagation(event);
        gesture("start", event, touches[i]);
      }
    }
  }

  function touchmoved(event) {
    var touches = event.changedTouches,
        n = touches.length, i, gesture;

    for (i = 0; i < n; ++i) {
      if (gesture = gestures[touches[i].identifier]) {
        noevent(event);
        gesture("drag", event, touches[i]);
      }
    }
  }

  function touchended(event) {
    var touches = event.changedTouches,
        n = touches.length, i, gesture;

    if (touchending) clearTimeout(touchending);
    touchending = setTimeout(function() { touchending = null; }, 500); // Ghost clicks are delayed!
    for (i = 0; i < n; ++i) {
      if (gesture = gestures[touches[i].identifier]) {
        nopropagation(event);
        gesture("end", event, touches[i]);
      }
    }
  }

  function beforestart(that, container, event, d, identifier, touch) {
    var dispatch = listeners.copy(),
        p = d3Selection.pointer(touch || event, container), dx, dy,
        s;

    if ((s = subject.call(that, new DragEvent("beforestart", {
        sourceEvent: event,
        target: drag,
        identifier,
        active,
        x: p[0],
        y: p[1],
        dx: 0,
        dy: 0,
        dispatch
      }), d)) == null) return;

    dx = s.x - p[0] || 0;
    dy = s.y - p[1] || 0;

    return function gesture(type, event, touch) {
      var p0 = p, n;
      switch (type) {
        case "start": gestures[identifier] = gesture, n = active++; break;
        case "end": delete gestures[identifier], --active; // falls through
        case "drag": p = d3Selection.pointer(touch || event, container), n = active; break;
      }
      dispatch.call(
        type,
        that,
        new DragEvent(type, {
          sourceEvent: event,
          subject: s,
          target: drag,
          identifier,
          active: n,
          x: p[0] + dx,
          y: p[1] + dy,
          dx: p[0] - p0[0],
          dy: p[1] - p0[1],
          dispatch
        }),
        d
      );
    };
  }

  drag.filter = function(_) {
    return arguments.length ? (filter = typeof _ === "function" ? _ : constant(!!_), drag) : filter;
  };

  drag.container = function(_) {
    return arguments.length ? (container = typeof _ === "function" ? _ : constant(_), drag) : container;
  };

  drag.subject = function(_) {
    return arguments.length ? (subject = typeof _ === "function" ? _ : constant(_), drag) : subject;
  };

  drag.touchable = function(_) {
    return arguments.length ? (touchable = typeof _ === "function" ? _ : constant(!!_), drag) : touchable;
  };

  drag.on = function() {
    var value = listeners.on.apply(listeners, arguments);
    return value === listeners ? drag : value;
  };

  drag.clickDistance = function(_) {
    return arguments.length ? (clickDistance2 = (_ = +_) * _, drag) : Math.sqrt(clickDistance2);
  };

  return drag;
}

exports.drag = drag;
exports.dragDisable = nodrag;
exports.dragEnable = yesdrag;

Object.defineProperty(exports, '__esModule', { value: true });

})));