Function _onPanStart

modules/core/src/controllers/controller.ts:411–428

(event: MjolnirGestureEvent)

  /* Event handlers */
  // Default handler for the `panstart` event.
  protected _onPanStart(event: MjolnirGestureEvent): boolean {
    const pos = this.getCenter(event);
    if (!this.isPointInBounds(pos, event)) {
      return false;
    }
    let alternateMode = this.isFunctionKeyPressed(event) || event.rightButton || false;
    if (this.invertPan || this.dragMode === 'pan') {
      // invertPan is replaced by props.dragMode, keeping for backward compatibility
      alternateMode = !alternateMode;
    }

    const newControllerState = this.controllerState[alternateMode ? 'panStart' : 'rotateStart']({
      pos
    });
    this._panMove = alternateMode;
    this.updateViewport(newControllerState, NO_TRANSITION_PROPS, {isDragging: true});
    return true;
  }

  // Default handler for the `panmove` and `panend` event.
  protected _onPan(event: MjolnirGestureEvent): boolean {