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Merge pull request #324 from jelychow/master

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优化 HomeBanner 组件最后一页滑动过渡效果
This commit is contained in:
hanxu317317
2019-09-02 19:18:00 +08:00
committed by GitHub
parent d3b6404e3f 3b1000b313
commit bf9715b23d
1 changed files with 39 additions and 15 deletions
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54
lib/components/home_banner.dart
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@ -22,6 +22,7 @@ class _BannerState extends State<HomeBanner> {
int realIndex = 1;
PageController controller;
Timer timer;
int lastPage=1;
@override
void initState() {
@ -33,6 +34,27 @@ class _BannerState extends State<HomeBanner> {
duration: Duration(milliseconds: 300),
curve: Curves.linear);
});
controller.addListener(() {
var res = (controller.page - lastPage).abs();
// setState(() {});
int count = widget.bannerStories.length;
if (res > (0.95)) {
if (realIndex == 0) {
controller.jumpToPage( widget.bannerStories.length);
virtualIndex = count - 1;
} else if (realIndex == widget.bannerStories.length + 1) {
virtualIndex = 0;
controller.jumpToPage(1);
} else {
virtualIndex = realIndex - 1;
}
setState(() {
});
}
});
}
@override
@ -67,9 +89,9 @@ class _BannerState extends State<HomeBanner> {
children: _buildItems(),),
_buildIndicator(), // 下面的小点
Positioned(//方法二
top: 0.0,
right: 0.0,
child: _numberIndicator(context,virtualIndex,widget.bannerStories.length),
top: 0.0,
right: 0.0,
child: _numberIndicator(context,virtualIndex,widget.bannerStories.length),
)
]),
);
@ -102,7 +124,7 @@ class _BannerState extends State<HomeBanner> {
child: Stack(
fit: StackFit.expand,
children: <Widget>[
Image.network(story.image, fit: BoxFit.cover),
Image.network(story.image, fit: BoxFit.cover),
_buildItemTitle(story.title), // 内容文字,大意
],),);
}
@ -141,18 +163,20 @@ class _BannerState extends State<HomeBanner> {
}
_onPageChanged(int index) {
lastPage = realIndex;
realIndex = index;
int count = widget.bannerStories.length;
if (index == 0) {
virtualIndex = count - 1;
controller.jumpToPage(count);
} else if (index == count + 1) {
virtualIndex = 0;
controller.jumpToPage(1);
} else {
virtualIndex = index - 1;
}
setState(() {});
// int count = widget.bannerStories.length;
// if (index == 0) {
// virtualIndex = count - 1;
// controller.jumpToPage(count);
// } else if (index == count + 1) {
// virtualIndex = 0;
// controller.jumpToPage(1);
// } else {
// virtualIndex = index - 1;
// }
// setState(() {});
}
}