// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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//
// Comment lines marked with "▼▼▼" and "▲▲▲" are used for authoring
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// Flutter code sample for TransitionDelegate
//
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// The following example demonstrates how to implement a subclass that always
// removes or adds routes without animated transitions and puts the removed
// routes at the top of the list.

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import 'package:flutter/widgets.dart';

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class NoAnimationTransitionDelegate extends TransitionDelegate<void> {
  @override
  Iterable<RouteTransitionRecord> resolve({
    required List<RouteTransitionRecord> newPageRouteHistory,
    required Map<RouteTransitionRecord?, RouteTransitionRecord>
        locationToExitingPageRoute,
    required Map<RouteTransitionRecord?, List<RouteTransitionRecord>>
        pageRouteToPagelessRoutes,
  }) {
    final List<RouteTransitionRecord> results = <RouteTransitionRecord>[];

    for (final RouteTransitionRecord pageRoute in newPageRouteHistory) {
      if (pageRoute.isWaitingForEnteringDecision) {
        pageRoute.markForAdd();
      }
      results.add(pageRoute);
    }
    for (final RouteTransitionRecord exitingPageRoute
        in locationToExitingPageRoute.values) {
      if (exitingPageRoute.isWaitingForExitingDecision) {
        exitingPageRoute.markForRemove();
        final List<RouteTransitionRecord>? pagelessRoutes =
            pageRouteToPagelessRoutes[exitingPageRoute];
        if (pagelessRoutes != null) {
          for (final RouteTransitionRecord pagelessRoute in pagelessRoutes) {
            pagelessRoute.markForRemove();
          }
        }
      }
      results.add(exitingPageRoute);
    }
    return results;
  }
}

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