Flutter中的透明页面路由，用于显示（半）透明页面 [英] Transparent PageRoute in Flutter for displaying a (semi-) transparent page

问题描述

是否可以使用具有透明背景的页面路由，以便我可以在现有页面顶部显示（半）透明页面？

Would it be possible to have a page route with a transparent background so I can show a (semi-)transparent page on top of an existing page?

< a href = https://i.stack.imgur.com/Mu2NE.jpg rel = noreferrer>

推荐答案

是的，绝对可以！一种解决方案是扩展 PageRoute 并使 opaque getter返回false。可能的解决方案如下所示：

Yes, definitely! One solution would be to extend PageRoute and make the opaque getter return false. A possible solution could look like the following:

import 'package:flutter/widgets.dart';

class TransparentRoute extends PageRoute<void> {
  TransparentRoute({
    @required this.builder,
    RouteSettings settings,
  })  : assert(builder != null),
        super(settings: settings, fullscreenDialog: false);

  final WidgetBuilder builder;

  @override
  bool get opaque => false;

  @override
  Color get barrierColor => null;

  @override
  String get barrierLabel => null;

  @override
  bool get maintainState => true;

  @override
  Duration get transitionDuration => Duration(milliseconds: 350);

  @override
  Widget buildPage(BuildContext context, Animation<double> animation,
      Animation<double> secondaryAnimation) {
    final result = builder(context);
    return FadeTransition(
      opacity: Tween<double>(begin: 0, end: 1).animate(animation),
      child: Semantics(
        scopesRoute: true,
        explicitChildNodes: true,
        child: result,
      ),
    );
  }
}

请记住，这也会创建自定义过渡动画和行为与较复杂的 MaterialPageRoute 不同（例如，向后滑动手势不适用于iOS上的当前实现）。

Keep in mind that this would also create a custom transition animation and behave differently than the more complex MaterialPageRoute (e.g. the swipe-back gesture would not work with the current implementation on iOS).

您可以这样使用它：

Navigator.of(context).push(
    TransparentRoute(builder: (BuildContext context) => YourSecondPage())
);

有关 PageRoute 和不同的实施者，请转至 https://docs.flutter.io/flutter/widgets /PageRoute-class.html

For more info on the PageRoute and the different implementers, head over to https://docs.flutter.io/flutter/widgets/PageRoute-class.html

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