@polygonjs/polygonjs/dist/src/core/CameraController.js

node-based WebGL 3D engine https://polygonjs.com

"use strict";
var EVENT = /* @__PURE__ */ ((EVENT2) => {
  EVENT2["CHANGE"] = "change";
  EVENT2["MOVEEND"] = "moveend";
  return EVENT2;
})(EVENT || {});
export class CameraController {
  constructor(_callback) {
    this._callback = _callback;
    this._updateAlways = true;
    this._listenerAdded = false;
    this._listener = this._executeCallback.bind(this);
  }
  removeTarget() {
    this.setTarget(void 0);
  }
  setTarget(target) {
    if (!target) {
      this._removeCameraEvent();
    }
    const old_target = this._target;
    this._target = target;
    if (this._target != null) {
      this._executeCallback();
    }
    if ((this._target != null ? this._target.uuid : void 0) !== (old_target != null ? old_target.uuid : void 0)) {
      this._addCameraEvent();
    }
  }
  setUpdateAlways(newUpdateAlways) {
    this._removeCameraEvent();
    this._updateAlways = newUpdateAlways;
    this._addCameraEvent();
  }
  _currentEventName() {
    if (this._updateAlways) {
      return "change" /* CHANGE */;
    } else {
      return "moveend" /* MOVEEND */;
    }
  }
  _addCameraEvent() {
    if (this._listenerAdded) {
      return;
    }
    if (this._target != null) {
      this._target.addEventListener(this._currentEventName(), this._listener);
      this._listenerAdded = true;
    }
  }
  _removeCameraEvent() {
    if (this._listenerAdded !== true) {
      return;
    }
    if (this._target != null) {
      this._target.removeEventListener(this._currentEventName(), this._listener);
      this._listenerAdded = false;
    }
  }
  _executeCallback() {
    if (this._target != null) {
      this._callback(this._target);
    }
  }
}