我正在寻找一种在文本小部件中实现跑马灯样式的方式,使得当文本从屏幕溢出时,它会自动开始滚动。有没有办法做到这一点?我已经尝试了所有的装饰模式,但似乎没有找到跑马灯选项。
我正在寻找一种在文本小部件中实现跑马灯样式的方式,使得当文本从屏幕溢出时,它会自动开始滚动。有没有办法做到这一点?我已经尝试了所有的装饰模式,但似乎没有找到跑马灯选项。
这个小部件就是我想出来的,我认为它能够满足你的需求:
class MarqueeWidget extends StatefulWidget {
final Widget child;
final Axis direction;
final Duration animationDuration, backDuration, pauseDuration;
const MarqueeWidget({
Key? key,
required this.child,
this.direction = Axis.horizontal,
this.animationDuration = const Duration(milliseconds: 6000),
this.backDuration = const Duration(milliseconds: 800),
this.pauseDuration = const Duration(milliseconds: 800),
}) : super(key: key);
@override
_MarqueeWidgetState createState() => _MarqueeWidgetState();
}
class _MarqueeWidgetState extends State<MarqueeWidget> {
late ScrollController scrollController;
@override
void initState() {
scrollController = ScrollController(initialScrollOffset: 50.0);
WidgetsBinding.instance.addPostFrameCallback(scroll);
super.initState();
}
@override
void dispose() {
scrollController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return SingleChildScrollView(
physics: NeverScrollableScrollPhysics(),
child: widget.child,
scrollDirection: widget.direction,
controller: scrollController,
);
}
void scroll(_) async {
while (scrollController.hasClients) {
await Future.delayed(widget.pauseDuration);
if (scrollController.hasClients) {
await scrollController.animateTo(
scrollController.position.maxScrollExtent,
duration: widget.animationDuration,
curve: Curves.ease,
);
}
await Future.delayed(widget.pauseDuration);
if (scrollController.hasClients) {
await scrollController.animateTo(
0.0,
duration: widget.backDuration,
curve: Curves.easeOut,
);
}
}
}
}
它的功能应该很明显。一个示例实现看起来像这样:
class FlutterMarqueeText extends StatefulWidget {
const FlutterMarqueeText({Key? key}) : super(key: key);
@override
_FlutterMarqueeTextState createState() => _FlutterMarqueeTextState();
}
class _FlutterMarqueeTextState extends State<FlutterMarqueeText> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text("Flutter Marquee Text"),
),
body: const Center(
child: SizedBox(
width: 200.0,
child: MarqueeWidget(
direction: Axis.horizontal,
child: Text("This text is to long to be shown in just one line"),
),
),
),
);
}
}