ente/lib/ui/grant_permissions_widget.dart

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:photo_manager/photo_manager.dart';
import 'package:photos/services/sync_service.dart';

class GrantPermissionsWidget extends StatelessWidget {
  const GrantPermissionsWidget({Key key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    final isLightMode =
        MediaQuery.of(context).platformBrightness == Brightness.light;
    return Scaffold(
      body: SingleChildScrollView(
        child: Padding(
          padding: const EdgeInsets.only(top: 20, bottom: 120),
          child: Column(
            children: [
              Center(
                child: Stack(
                  alignment: Alignment.center,
                  children: [
                    isLightMode
                        ? Image.asset(
                            'assets/loading_photos_background.png',
                            color: Colors.white.withOpacity(0.4),
                            colorBlendMode: BlendMode.modulate,
                          )
                        : Image.asset(
                            'assets/loading_photos_background_dark.png',
                          ),
                    Center(
                      child: Column(
                        children: [
                          const SizedBox(height: 42),
                          Image.asset(
                            "assets/gallery_locked.png",
                            height: 160,
                          ),
                        ],
                      ),
                    ),
                  ],
                ),
              ),
              Padding(
                padding: const EdgeInsets.fromLTRB(40, 0, 40, 0),
                child: RichText(
                  text: TextSpan(
                    style: Theme.of(context)
                        .textTheme
                        .headline5
                        .copyWith(fontWeight: FontWeight.w700),
                    children: [
                      const TextSpan(text: 'ente '),
                      TextSpan(
                        text: "needs permission to ",
                        style: Theme.of(context)
                            .textTheme
                            .headline5
                            .copyWith(fontWeight: FontWeight.w400),
                      ),
                      const TextSpan(text: 'preserve your photos'),
                    ],
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
      floatingActionButton: Container(
        decoration: BoxDecoration(
          boxShadow: [
            BoxShadow(
              color: Theme.of(context).backgroundColor,
              spreadRadius: 190,
              blurRadius: 30,
              offset: const Offset(0, 170),
            )
          ],
        ),
        width: double.infinity,
        padding: const EdgeInsets.only(
          left: 20,
          right: 20,
          bottom: 16,
        ),
        child: OutlinedButton(
          child: const Text("Grant permission"),
          onPressed: () async {
            final state = await PhotoManager.requestPermissionExtend();
            if (state == PermissionState.authorized ||
                state == PermissionState.limited) {
              await SyncService.instance.onPermissionGranted(state);
            } else if (state == PermissionState.denied) {
              final AlertDialog alert = AlertDialog(
                title: const Text("Please grant permissions"),
                content: const Text(
                  "ente can encrypt and preserve files only if you grant access to them",
                ),
                actions: [
                  TextButton(
                    child: Text(
                      "OK",
                      style: Theme.of(context).textTheme.subtitle1.copyWith(
                            fontSize: 14,
                            fontWeight: FontWeight.w700,
                          ),
                    ),
                    onPressed: () {
                      Navigator.of(context, rootNavigator: true).pop('dialog');
                      if (Platform.isIOS) {
                        PhotoManager.openSetting();
                      }
                    },
                  ),
                ],
              );

              showDialog(
                context: context,
                builder: (BuildContext context) {
                  return alert;
                },
                barrierColor: Colors.black12,
              );
            }
          },
        ),
      ),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
    );
  }
}