offset_animation.dart

// The MIT License (MIT)
//
// Copyright (c) 2020 nslogx
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.

import 'package:flutter/widgets.dart';

import 'animation.dart';

class OffsetAnimation extends EasyLoadingAnimation {
  OffsetAnimation();

  @override
  Widget buildWidget(
    Widget child,
    AnimationController controller,
    AlignmentGeometry alignment,
  ) {
    Offset _begin = alignment == AlignmentDirectional.topCenter
        ? Offset(0, -1)
        : alignment == AlignmentDirectional.bottomCenter
            ? Offset(0, 1)
            : Offset(0, 0);
    Animation<Offset> _animation = Tween(
      begin: _begin,
      end: Offset(0, 0),
    ).animate(controller);
    return Opacity(
      opacity: controller.value,
      child: SlideTransition(
        position: _animation,
        child: child,
      ),
    );
  }
}