void _handleDragEnd(DragEndDetails details)
{
D.assert(this.mounted);
D.assert(this._backGestureController != null);
this._backGestureController.dragEnd(
this._convertToLogical(details.velocity.pixelsPerSecond.dx / this.context.size.width) ?? 0);
this._backGestureController = null;
}
void _handleDragCancel()
{
D.assert(this.mounted);
this._backGestureController?.dragEnd(0.0f);
this._backGestureController = null;
}
void _handleDragStart(DragStartDetails details)
{
D.assert(this.mounted);
D.assert(this._backGestureController == null);
this._backGestureController = this.widget.onStartPopGesture();
}