Hibok/lib/utils/image_util.dart

import 'dart:async';
import 'dart:io';
import 'dart:typed_data';
import 'dart:ui';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:chat/data/group_data_mgr.dart';
import 'package:chat/models/group_info_model.dart';
import 'package:chat/utils/screen.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_image_compress/flutter_image_compress.dart';

import '../r.dart';
import 'file_cache_mgr.dart';
import 'group_member_model.dart';


const ImgSizeLimit = 60 * 1024;


/// Widget Util.
class WidgetUtil {
  bool _hasMeasured = false;
  double _width;
  double _height;

  /// Widget rendering listener.
  /// Widget渲染监听.
  /// context: Widget context.
  /// isOnce: true,Continuous monitoring  false,Listen only once.
  /// onCallBack: Widget Rect CallBack.
  void asyncPrepare(
      BuildContext context, bool isOnce, ValueChanged<Rect> onCallBack) {
    if (_hasMeasured) return;
    WidgetsBinding.instance.addPostFrameCallback((Duration timeStamp) {
      RenderBox box = context.findRenderObject();
      if (box != null && box.semanticBounds != null) {
        if (isOnce) _hasMeasured = true;
        double width = box.semanticBounds.width;
        double height = box.semanticBounds.height;
        if (_width != width || _height != height) {
          _width = width;
          _height = height;
          if (onCallBack != null) onCallBack(box.semanticBounds);
        }
      }
    });
  }

  /// Widget渲染监听.
  void asyncPrepares(bool isOnce, ValueChanged<Rect> onCallBack) {
    if (_hasMeasured) return;
    WidgetsBinding.instance.addPostFrameCallback((Duration timeStamp) {
      if (isOnce) _hasMeasured = true;
      if (onCallBack != null) onCallBack(null);
    });
  }

  ///get Widget Bounds (width, height, left, top, right, bottom and so on).Widgets must be rendered completely.
  ///获取widget Rect
  static Rect getWidgetBounds(BuildContext context) {
    RenderBox box = context.findRenderObject();
    return (box != null && box.semanticBounds != null)
        ? box.semanticBounds
        : Rect.zero;
  }

  static getCompressImg(String imgPath) async {
    var compressImg = await FlutterImageCompress.compressWithFile(imgPath,
        quality: 20, minWidth: Screen.width.toInt());
    print('图片压缩完毕 : ${compressImg.length}');
    if (compressImg.length > ImgSizeLimit) {
      //仍大于，再压缩一次
      compressImg = await FlutterImageCompress.compressWithFile(imgPath,
          quality: 20, minWidth: (Screen.width * 0.5).toInt());
    }

    return compressImg;
  }

  ///Get the coordinates of the widget on the screen.Widgets must be rendered completely.
  ///获取widget在屏幕上的坐标,widget必须渲染完成
  static Offset getWidgetLocalToGlobal(BuildContext context) {
    RenderBox box = context.findRenderObject();
    return box == null ? Offset.zero : box.localToGlobal(Offset.zero);
  }

  /// get image width height，load error return Rect.zero.（unit px）
  /// 获取图片宽高，加载错误情况返回 Rect.zero.（单位 px）
  /// image
  /// url network
  /// local url , package
  static Future<Rect> getImageWH(
      {Image image, String url, String localUrl, String package}) {
    if (image == null && url == null && localUrl == null) {
      return Future.value(Rect.zero);
    }
    Completer<Rect> completer = Completer<Rect>();
    Image img = image != null
        ? image
        : ((url != null && url.isNotEmpty)
            ? Image.network(url)
            : Image.asset(localUrl, package: package));
    img.image
        .resolve(new ImageConfiguration())
        .addListener(new ImageStreamListener(
          (ImageInfo info, bool _) {
            completer.complete(Rect.fromLTWH(0, 0, info.image.width.toDouble(),
                info.image.height.toDouble()));
          },
          onError: (dynamic exception, StackTrace stackTrace) {
            completer.completeError(exception, stackTrace);
          },
        ));
    return completer.future;
  }

  /// get image width height, load error throw exception.（unit px）
  /// 获取图片宽高，加载错误会抛出异常.（单位 px）
  /// image
  /// url network
  /// local url (full path/全路径，example："assets/images/ali_connors.png"，""assets/images/3.0x/ali_connors.png"" );
  /// package
  static Future<Rect> getImageWHE(
      {Image image, String url, String localUrl, String package}) {
    if (image == null && url == null && localUrl == null) {
      return Future.value(Rect.zero);
    }
    Completer<Rect> completer = Completer<Rect>();
    Image img = image != null
        ? image
        : ((url != null && url.isNotEmpty)
            ? Image.network(url)
            : Image.asset(localUrl, package: package));
    img.image
        .resolve(new ImageConfiguration())
        .addListener(new ImageStreamListener(
          (ImageInfo info, bool _) {
            completer.complete(Rect.fromLTWH(0, 0, info.image.width.toDouble(),
                info.image.height.toDouble()));
          },
          onError: (dynamic exception, StackTrace stackTrace) {
            completer.completeError(exception, stackTrace);
          },
        ));

    return completer.future;
  }









  static ImageProvider   groupAvatar(String path )   {

    path = FileCacheMgr.replacePath(path);
    Uint8List fileData = File(path).readAsBytesSync();
//    print('fileData ${fileData.length}');
    return MemoryImage(fileData);


  }


  static Widget getAvatarNew(GroupInfoModel model,GlobalKey key,Function backPath) {

    List<GroupMemberModel> members =[];

    for(int k=0;k< model.members.length;k++){ //只加入存在群的
      GroupMemberModel mo = model.members[k];
      if(mo.inGroup==1){
        members.add(mo);
      }
    }




    if(model.image!=null && model.image.length>2){
      print('${model.name} 群头像地址:${model.image}');

      File file = new File(model.image);

//      int filelength =   file.readAsBytesSync().length;
//      print('群头像地址file size : $filelength');
      if(  file.existsSync()){ //防止头像文件被清除后

        Uint8List pngBytes =file.readAsBytesSync();
        print('pngBytes.lengthInBytes length；${pngBytes.lengthInBytes}');
        if(pngBytes.lengthInBytes>8000){
          return ClipRRect(  borderRadius: BorderRadius.circular(5),child:Container(color: Color(0xffE9E9E9),width: 52,height: 52,child:
          Image.file(
            File(FileCacheMgr.replacePath(model.image)),
            fit: BoxFit.contain,
            width: 50,
            height: 50,
          ),) ,);
        }


      }else{
        backPath('');
      }


    }


    ///先让下面的图片显示，5秒后截图保存图片
    Future.delayed(Duration(seconds: 3),() async{
//      print('没有群图片-开始生成保存到本地:${model.members.length}');
      try {

        RenderRepaintBoundary boundary =
        key.currentContext.findRenderObject();
        var image = await boundary.toImage(pixelRatio:2);
        ByteData byteData = await image.toByteData(format: ImageByteFormat.png);
        Uint8List pngBytes = byteData.buffer.asUint8List();
        File file =await FileCacheMgr().writeFile(model.sessionId.toString(),pngBytes);
        print('图片地址byteData${byteData.lengthInBytes}');
        if(byteData.lengthInBytes>8000 && members.length>1){  //图片保存成功
          GroupInfoMgr().updateAvatar(model.sessionId,file.path);
          backPath(file.path);
        }

//        ImageGallerySaver.saveImage(pngBytes);
//        return pngBytes;//这个对象就是图片数据
      } catch (e) {
        print(e);
      }

    });

    if(members.length>9){
      members = members.sublist(0,9);
    }





    if (members.length > 0) {
      double itemSize = 10;
      switch (members.length) {
        case 1:

          return RepaintBoundary(key: key,child: ClipRRect(borderRadius: BorderRadius.circular(3),child: Container(color: Color(0xffE9E9E9),width: 52,height: 52,child: Padding(padding: EdgeInsets.all(1),child: CachedNetworkImage(
            imageUrl:  members[0].avtar,
            width: 45,
            height: 45,
              placeholder: (context, url) =>
                  Image.asset(R.assetsImagesDefaultNorAvatar,width: 45,
                    height: 45,)
          ),),),),);
          break;
        case 2:
          return RepaintBoundary(key: key,child: ClipRRect(borderRadius: BorderRadius.circular(3),child: Container(color: Color(0xffE9E9E9),width: 52,height: 52,child: Row(children: <Widget>[
            Padding(padding: EdgeInsets.all(1),child: ClipRRect(
              borderRadius: BorderRadius.circular(3),
              child: CachedNetworkImage(
                imageUrl:  members[0].avtar,
                width: 23,
                height: 23,
                  placeholder: (context, url) =>
                      Image.asset(R.assetsImagesDefaultNorAvatar,  width: 23,
                        height: 23,)
              ),
            ),),
            Padding(padding: EdgeInsets.all(1),child: ClipRRect(
              borderRadius: BorderRadius.circular(3),
              child: CachedNetworkImage(
                imageUrl:  members[1].avtar,
                width: 23,
                height: 23,placeholder: (context, url) =>
                  Image.asset(R.assetsImagesDefaultNorAvatar,width: 23,
                    height: 23,)
              ),
            ),)
          ],),),),);
        case 3:
          return RepaintBoundary(key: key,child: ClipRRect(borderRadius: BorderRadius.circular(3),child: Container(color: Color(0xffE9E9E9),width: 52,height: 52,child: Column(children: <Widget>[

            Padding(padding: EdgeInsets.all(1),child: ClipRRect(
              borderRadius: BorderRadius.circular(3),
              child: CachedNetworkImage(
                imageUrl:  members[0].avtar,
                width: 23,
                height: 23,placeholder: (context, url) =>
                  Image.asset(R.assetsImagesDefaultNorAvatar,width: 23,
                    height: 23,)
              ),
            ),),


            Row(children: <Widget>[
              Padding(padding: EdgeInsets.all(1),child: ClipRRect(
                borderRadius: BorderRadius.circular(3),
                child: CachedNetworkImage(
                  imageUrl:  members[1].avtar,
                  width: 23,
                  height: 23,placeholder: (context, url) =>
                    Image.asset(R.assetsImagesDefaultNorAvatar,width: 23,
                      height: 23,)
                ),
              ),),
              Padding(padding: EdgeInsets.all(1),child: ClipRRect(
                borderRadius: BorderRadius.circular(3),
                child: CachedNetworkImage(
                  imageUrl:  members[2].avtar,
                  width: 23,
                  height: 23,placeholder: (context, url) =>
                    Image.asset(R.assetsImagesDefaultNorAvatar,width: 23,
                      height: 23,)
                ),
              ),)
            ],)

          ],),),),);
      }

      if (members.length == 4) {
        itemSize = 23;
      } else {
        itemSize = 15;
      }

      List<Widget> widgetList = [];
      for (int k = 0; k <  members.length; k++) {
        widgetList.add(Padding(padding: EdgeInsets.all(1),child: ClipRRect(
          borderRadius: BorderRadius.circular(3),
          child: CachedNetworkImage(
            imageUrl:  members[k].avtar,
            width: itemSize,
            height: itemSize,placeholder: (context, url) =>
              Image.asset(R.assetsImagesDefaultNorAvatar,width: itemSize,
                height: itemSize,)
          ),
        ),));
      }

      return RepaintBoundary(key: key,child: ClipRRect(borderRadius: BorderRadius.circular(3),child: Container(
        color: Color(0xffE9E9E9),
        width: 52,
        height: 52,
        alignment: Alignment.center,
        child: Wrap(
            crossAxisAlignment: WrapCrossAlignment.start, children: widgetList),
      ),),);
    } else {
      return ClipRRect(borderRadius: BorderRadius.circular(3),child: Container(color: Color(0xffE9E9E9),),);
    }
  }

}