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视频聊天源码,Flutter自适应瀑布流

时间:2021-09-16 00:32:13      阅读:4      评论:0      收藏:0      [点我收藏+]

视频聊天源码,Flutter自适应瀑布流实现的相关代码
1.图片自适应:

Widget image = Stack(
children: <Widget>[
ExtendedImage.network(
item.imageUrl,
shape: BoxShape.rectangle,
//clearMemoryCacheWhenDispose: true,
border: Border.all(color: Colors.grey.withOpacity(0.4), width: 1.0),
borderRadius: const BorderRadius.all(
Radius.circular(10.0),
),
loadStateChanged: (ExtendedImageState value) {
if (value.extendedImageLoadState == LoadState.loading) {
Widget loadingWidget = Container(
alignment: Alignment.center,
color: Colors.grey.withOpacity(0.8),
child: CircularProgressIndicator(
strokeWidth: 2.0,
valueColor:
AlwaysStoppedAnimation<Color>(Theme.of(c).primaryColor),
),
);
if (!konwSized) {
//todo: not work in web
loadingWidget = AspectRatio(
aspectRatio: 1.0,
child: loadingWidget,
);
}
return loadingWidget;
} else if (value.extendedImageLoadState == LoadState.completed) {
item.imageRawSize = Size(
value.extendedImageInfo.image.width.toDouble(),
value.extendedImageInfo.image.height.toDouble());
}
return null;
},
),
Positioned(
top: 5.0,
right: 5.0,
child: Container(
padding: const EdgeInsets.all(3.0),
decoration: BoxDecoration(
color: Colors.grey.withOpacity(0.6),
border: Border.all(color: Colors.grey.withOpacity(0.4), width: 1.0),
borderRadius: const BorderRadius.all(
Radius.circular(5.0),
),
),
child: Text(
${index + 1},
textAlign: TextAlign.center,
style: const TextStyle(fontSize: fontSize, color: Colors.white),
),
),
)
],
);
if (konwSized) {
image = AspectRatio(
aspectRatio: item.imageSize.width / item.imageSize.height,
child: image,
);
} else if (item.imageRawSize != null) {
image = AspectRatio(
aspectRatio: item.imageRawSize.width / item.imageRawSize.height,
child: image,
);
}
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
image,
const SizedBox(
height: 5.0,
),
buildTagsWidget(item),
const SizedBox(
height: 5.0,
),
buildBottomWidget(item),
],
);
}

 

2.自适应标签:

Widget buildTagsWidget(
TuChongItem item, {
int maxNum = 6,
}) {
const double fontSize = 12.0;
return Wrap(
runSpacing: 5.0,
spacing: 5.0,
children: item.tags.take(maxNum).map<Widget>((String tag) {
final Color color = item.tagColors[item.tags.indexOf(tag)];
return Container(
padding: const EdgeInsets.all(3.0),
decoration: BoxDecoration(
color: color,
border: Border.all(color: Colors.grey.withOpacity(0.4), width: 1.0),
borderRadius: const BorderRadius.all(
Radius.circular(5.0),
),
),
child: Text(
tag,
textAlign: TextAlign.start,
style: TextStyle(
fontSize: fontSize,
color: color.computeLuminance() < 0.5
? Colors.white
: Colors.black),
),
);
}).toList());
}

 

3.上拉刷新和下拉加载

class PullToRefreshHeader extends StatelessWidget {
const PullToRefreshHeader(this.info, this.lastRefreshTime, {this.color});
final PullToRefreshScrollNotificationInfo info;
final DateTime lastRefreshTime;
final Color color;
@override
Widget build(BuildContext context) {
if (info == null) {
return Container();
}
String text = ‘‘;
if (info.mode == RefreshIndicatorMode.armed) {
text = Release to refresh;
} else if (info.mode == RefreshIndicatorMode.refresh ||
info.mode == RefreshIndicatorMode.snap) {
text = Loading...;
} else if (info.mode == RefreshIndicatorMode.done) {
text = Refresh completed.;
} else if (info.mode == RefreshIndicatorMode.drag) {
text = Pull to refresh;
} else if (info.mode == RefreshIndicatorMode.canceled) {
text = Cancel refresh;
}

final TextStyle ts = const TextStyle(
color: Colors.grey,
).copyWith(fontSize: 13);

final double dragOffset = info?.dragOffset ?? 0.0;

final DateTime time = lastRefreshTime ?? DateTime.now();
final double top = -hideHeight + dragOffset;
return Container(
height: dragOffset,
color: color ?? Colors.transparent,
//padding: EdgeInsets.only(top: dragOffset / 3),
//padding: EdgeInsets.only(bottom: 5.0),
child: Stack(
children: <Widget>[
Positioned(
left: 0.0,
right: 0.0,
top: top,
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Expanded(
child: Container(
alignment: Alignment.centerRight,
child: RefreshImage(top),
margin: const EdgeInsets.only(right: 12.0),
),
),
Column(
children: <Widget>[
Text(
text,
style: ts,
),
Text(
Last updated: +
DateFormat(yyyy-MM-dd hh:mm).format(time),
style: ts.copyWith(fontSize: 12),
)
],
),
Expanded(
child: Container(),
),
],
),
)
],
),
);
}
}

class RefreshImage extends StatelessWidget {
const RefreshImage(this.top);
final double top;
@override
Widget build(BuildContext context) {
const double imageSize = 40;
return ExtendedImage.asset(
Assets.assets_fluttercandies_grey_png,
width: imageSize,
height: imageSize,
afterPaintImage: (Canvas canvas, Rect rect, ui.Image image, Paint paint) {
final double imageHeight = image.height.toDouble();
final double imageWidth = image.width.toDouble();
final Size size = rect.size;
final double y = (1 - min(top / (refreshHeight - hideHeight), 1)) *
imageHeight;

canvas.drawImageRect(
image,
Rect.fromLTWH(0.0, y, imageWidth, imageHeight - y),
Rect.fromLTWH(rect.left, rect.top + y / imageHeight * size.height,
size.width, (imageHeight - y) / imageHeight * size.height),
Paint()
..colorFilter =
const ColorFilter.mode(Color(0xFFea5504), BlendMode.srcIn)
..isAntiAlias = false
..filterQuality = FilterQuality.low);

//canvas.restore();
},
);
}
}

 

4.底部的点赞按钮

LikeButton(
size: 18.0,
isLiked: item.isFavorite,
likeCount: item.favorites,
countBuilder: (int count, bool isLiked, String text) {
final ColorSwatch<int> color =
isLiked ? Colors.pinkAccent : Colors.grey;
Widget result;
if (count == 0) {
result = Text(
love,
style: TextStyle(color: color, fontSize: fontSize),
);
} else {
result = Text(
count >= 1000 ? (count / 1000.0).toStringAsFixed(1) + k : text,
style: TextStyle(color: color, fontSize: fontSize),
);
}
return result;
},
likeCountAnimationType: item.favorites < 1000
? LikeCountAnimationType.part
: LikeCountAnimationType.none,
onTap: (bool isLiked) {
return onLikeButtonTap(isLiked, item);
},
)

 

以上就是 视频聊天源码,Flutter自适应瀑布流实现的相关代码,更多内容欢迎关注之后的文章

视频聊天源码,Flutter自适应瀑布流

原文:https://www.cnblogs.com/yunbaomengnan/p/15267336.html

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