| // 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. |
| |
| // Template: dev/snippets/config/templates/freeform.tmpl |
| // |
| // Comment lines marked with "▼▼▼" and "▲▲▲" are used for authoring |
| // of samples, and may be ignored if you are just exploring the sample. |
| |
| // Flutter code sample for TransitionDelegate |
| // |
| //*************************************************************************** |
| //* ▼▼▼▼▼▼▼▼ description ▼▼▼▼▼▼▼▼ (do not modify or remove section marker) |
| |
| // 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. |
| |
| //* ▲▲▲▲▲▲▲▲ description ▲▲▲▲▲▲▲▲ (do not modify or remove section marker) |
| //*************************************************************************** |
| |
| //**************************************************************************** |
| //* ▼▼▼▼▼▼▼▼ code-imports ▼▼▼▼▼▼▼▼ (do not modify or remove section marker) |
| |
| import 'package:flutter/widgets.dart'; |
| |
| //* ▲▲▲▲▲▲▲▲ code-imports ▲▲▲▲▲▲▲▲ (do not modify or remove section marker) |
| //**************************************************************************** |
| |
| //******************************************************************** |
| //* ▼▼▼▼▼▼▼▼ code ▼▼▼▼▼▼▼▼ (do not modify or remove section marker) |
| |
| 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; |
| } |
| } |
| |
| //* ▲▲▲▲▲▲▲▲ code ▲▲▲▲▲▲▲▲ (do not modify or remove section marker) |
| //******************************************************************** |
