app/lib/widgets/image_picker.dart

/*
 * ====================================================
 * package   : 
 * author    : Created by nansi.
 * time      : 2019-08-27  16:21 
 * remark    : 
 * ====================================================
 */

import 'dart:async';
import 'dart:io';

import 'package:flutter/material.dart';

import 'package:image_picker/image_picker.dart' as flutterImgPicker;
import 'package:photo/photo.dart';
import 'package:photo_manager/photo_manager.dart';

import 'package:recook/models/media_model.dart';
import 'package:recook/utils/image_utils.dart';
import 'package:recook/widgets/no_data_view.dart';

class ImagePicker implements LoadingDelegate {
  int rowCount;
  int maxSelected;
  double padding;
  double itemRadio;
  Color themeColor;
  Color dividerColor;
  Color textColor;
  Color disableColor;
  int thumbSize;
  I18nProvider provider;
  SortDelegate sortDelegate;
  CheckBoxBuilderDelegate checkBoxBuilderDelegate;
  LoadingDelegate loadingDelegate;
  PickType pickType;
  BadgeDelegate badgeDelegate;
  List<AssetPathEntity> photoPathList;

  ImagePicker(
      {this.rowCount,
      this.maxSelected,
      this.padding,
      this.itemRadio,
      this.themeColor,
      this.dividerColor,
      this.textColor,
      this.disableColor,
      this.thumbSize,
      this.provider,
      this.sortDelegate,
      this.checkBoxBuilderDelegate,
      this.loadingDelegate,
      this.pickType = PickType.all,
      this.badgeDelegate = const DefaultBadgeDelegate(),
      this.photoPathList});

  static ImagePicker builder({
    int rowCount = 4,
    int maxSelected = 9,
    double padding = 0,
    double itemRadio = 1.0,
    Color themeColor = Colors.red,
    Color dividerColor = Colors.white,
    Color textColor = Colors.white,
    Color disableColor,
    int thumbSize = 100,
    I18nProvider provider = I18nProvider.chinese,
    SortDelegate sortDelegate,
    LoadingDelegate loadingDelegate,
    PickType pickType = PickType.all,
    BadgeDelegate badgeDelegate = const DefaultBadgeDelegate(),
    List<AssetPathEntity> photoPathList,
  }) {
    ImagePicker picker = ImagePicker(
      rowCount: rowCount,
      maxSelected: maxSelected,
      padding: padding = 3,
      itemRadio: itemRadio,
      themeColor: themeColor,
      dividerColor: dividerColor,
      textColor: textColor,
      disableColor: disableColor,
      thumbSize: thumbSize,
      provider: provider,
      sortDelegate: sortDelegate,
      checkBoxBuilderDelegate: DefaultCheckBoxBuilderDelegate(
        activeColor: Colors.white,
        unselectedColor: Colors.white,
        checkColor: Colors.blue,
      ),
      loadingDelegate: loadingDelegate,
      pickType: pickType,
      badgeDelegate: badgeDelegate,
      photoPathList: photoPathList,
    );

    return picker;
  }

  Future<MediaModel> pickImage({@required flutterImgPicker.ImageSource source,
      bool cropImage:false,
      double maxWidth,
      double maxHeight,
      int imageQuality,
      }) async {
      File imageFile = await flutterImgPicker.ImagePicker.pickImage(source: source, maxWidth: maxWidth, maxHeight: maxHeight, imageQuality: imageQuality);
      if (imageFile == null) {
        return null;
      }
      if (cropImage) {
        File cropFile = await ImageUtils.cropImage(imageFile);
        if (cropFile == null) {
          return null;
        }
        imageFile = cropFile;
      }
      // var size = await _calculateImageDimension(imageFile);
      // double width = size.width;
      // double height = size.height;
      MediaModel mediaModel = MediaModel();
      mediaModel.file = imageFile;
      mediaModel.thumbData = await imageFile.readAsBytes();
      var decodedImage = await decodeImageFromList(mediaModel.thumbData);
      mediaModel.width = decodedImage.height.toInt();
      mediaModel.height = decodedImage.width.toInt();
      mediaModel.type = MediaType.image;
      return mediaModel;
  }

  // Future<Size> _calculateImageDimension(file) {
  //   Completer<Size> completer = Completer();
  //   Image image = Image.file(file);
  //   image.image.resolve(ImageConfiguration()).addListener(
  //     ImageStreamListener(
  //       (ImageInfo image, bool synchronousCall) {
  //         var myImage = image.image;
  //         Size size = Size(myImage.width.toDouble(), myImage.height.toDouble());
  //         completer.complete(size);
  //       },
  //     ),
  //   );
  //   return completer.future;
  // }

  Future<List<MediaModel>> pickAsset(BuildContext context) async {
    List<MediaModel> medias = [];
    List<AssetEntity> entities = await PhotoPicker.pickAsset(
        context: context,
        /// The following are optional parameters.
        themeColor: themeColor,
        // the title color and bottom color
        padding: padding,
        // item padding
        dividerColor: dividerColor,
        // divider color
        disableColor: disableColor??= Colors.grey.shade300,
        // the check box disable color
        itemRadio: itemRadio,
        // the content item radio
        maxSelected: maxSelected,
        // max picker image count
        provider: provider,
        // i18n provider ,default is chinese. , you can custom I18nProvider or use ENProvider()
        rowCount: rowCount,
        // item row count
        textColor: textColor,
        // text color
        thumbSize: thumbSize,
        // preview thumb size , default is 64
        sortDelegate: sortDelegate,
        // default is common ,or you make custom delegate to sort your gallery
        checkBoxBuilderDelegate: checkBoxBuilderDelegate,
        // default is DefaultCheckBoxBuilderDelegate ,or you make custom delegate to create checkbox

        loadingDelegate: null,
        // if you want to build custom loading widget,extends LoadingDelegate [see example/lib/main.dart]

        badgeDelegate: badgeDelegate,
        pickType: pickType,
        // all/image/video
        photoPathList: photoPathList
//      List<AssetPathEntity> photoPathList, /// when [photoPathList] is not null , [pickType] invalid .
        );

    for (AssetEntity entity in entities) {
        MediaModel mediaModel = MediaModel();
        mediaModel.file = await entity.file;
        mediaModel.width =  entity.size.width.toInt();
        mediaModel.height =  entity.size.height.toInt();
        mediaModel.thumbData = await entity.thumbData;
        mediaModel.type = entity.type == AssetType.video ? MediaType.video : MediaType.image;
        medias.add(mediaModel);
    }
    return medias;
  }

  @override
  Widget buildBigImageLoading(BuildContext context, AssetEntity entity, Color themeColor) {
    return NoDataView();
  }

  @override
  Widget buildPreviewLoading(BuildContext context, AssetEntity entity, Color themeColor) {
    return NoDataView();
  }
}