kmpdfkit_demo/example/lib/widgets/convert_options_widget.dart

///  convert_options_widget.dart
///
///  Copyright © 2014-2023 PDF Technologies, Inc. All Rights Reserved.
///
///  THIS SOURCE CODE AND ANY ACCOMPANYING DOCUMENTATION ARE PROTECTED BY INTERNATIONAL COPYRIGHT LAW
///  AND MAY NOT BE RESOLD OR REDISTRIBUTED. USAGE IS BOUND TO THE ComPDFKit LICENSE AGREEMENT.
///  UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS SUBJECT TO CIVIL AND CRIMINAL PENALTIES.
///  This notice may not be removed from this file.

import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:kmpdfkit_conversion_flutter/models/convert_type.dart';
import 'package:kmpdfkit_conversion_flutter/models/options/options.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:provider/provider.dart';

import '../states/convert_options_provider.dart';
import '../states/convert_task_queue_provider.dart';
import 'options/convert_csv_options_widget.dart';
import 'options/convert_excel_options_widget.dart';
import 'options/convert_html_options_widget.dart';
import 'options/convert_image_options_widget.dart';
import 'options/convert_ppt_options_widget.dart';
import 'options/convert_rtf_options_widget.dart';
import 'options/convert_word_options_widget.dart';



class ConvertConfigWidget extends StatefulWidget {
  const ConvertConfigWidget({Key? key}) : super(key: key);

  @override
  State<ConvertConfigWidget> createState() => _ConvertConfigWidgetState();
}

class _ConvertConfigWidgetState extends State<ConvertConfigWidget> {
  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Row(
          children: [
            const Text('ConvertType:'),
            Consumer<ConvertOptionsProvider>(
                builder: (context, optionsProvider, child) {
              return Expanded(
                  child: TextButton(
                child: Text(
                  optionsProvider.convertType == ConvertType.none
                      ? 'Please click to select a conversion type'
                      : optionsProvider.convertType.name,
                  style: const TextStyle(fontSize: 12),
                ),
                onPressed: () async {
                  _selectConvertType(context);
                },
              ));
            }),
            IconButton(
                onPressed: () {
                  ConvertType convertType =
                      context.read<ConvertOptionsProvider>().convertType;
                  _showConvertOptionsModalBottomSheet(context, convertType);
                },
                icon: const Icon(Icons.settings))
          ],
        ),
        SizedBox(
            width: double.infinity,
            child: ElevatedButton(
                onPressed: () async {
                  ConvertType convertType =
                      context.read<ConvertOptionsProvider>().convertType;
                  if (convertType != ConvertType.none) {
                    Options options =
                        context.read<ConvertOptionsProvider>().getOptions();

                    List<String> files = await getPDFFileList(context);
                    var outputPath = await context
                        .read<ConvertTaskQueueProvider>()
                        .getOutputDir();
                    context.read<ConvertTaskQueueProvider>().addTask(
                        convertType, options, files, outputPath ?? "");
                  }
                },
                child: const Text('Convert')))
      ],
    );
  }

  ///request storage permission
  Future<bool> getPermission() async {
    var status = await Permission.storage.request();
    var manageStatus = await Permission.manageExternalStorage.request();
    return status.isGranted && manageStatus.isGranted;
  }

  ///Select pdf files from android\ios using 'file_picker'
  Future<List<String>> getPDFFileList(BuildContext context) async {
    bool isGranted = await getPermission();
    if (!isGranted) {
      return List.empty();
    }
    FilePickerResult? result = await FilePicker.platform.pickFiles(
        type: FileType.custom, allowedExtensions: ['pdf'], allowMultiple: true);
    if (result != null) {
      List<String?> pdfFiles = result.paths;
      var files = pdfFiles.where((element) => element != null);
      return List.from(files);
    } else {
      return List.empty();
    }
  }

  void _showConvertOptionsModalBottomSheet(context, ConvertType convertType) {
    showModalBottomSheet<int>(
        context: context,
        isScrollControlled: false,
        builder: (BuildContext context) {
          switch (convertType) {
            case ConvertType.ppt:
              return const ConvertPPTOptionsWidget();
            case ConvertType.word:
              return const ConvertWordOptionsWidget();
            case ConvertType.excel:
              return const ConvertExcelOptionsWidget();
            case ConvertType.image:
              return const ConvertImageOptionsWidget();
            case ConvertType.csv:
              return const ConvertCSVOptionsWidget();
            case ConvertType.rtf:
              return const ConvertRTFOptionsWidget();
            case ConvertType.html:
              return const ConvertHtmlOptionsWidget();
            default:
              return const Padding(
                  padding: EdgeInsets.all(16),
                  child: Text('Options not support'));
          }
        });
  }

  /// show support convert mime type
  void _selectConvertType(context) {
    List<ConvertType> convertList = [
      ConvertType.ppt,
      ConvertType.word,
      ConvertType.excel,
      ConvertType.txt,
      ConvertType.image,
      ConvertType.csv,
      ConvertType.rtf,
      ConvertType.html
    ];

    showModalBottomSheet(
        context: context,
        builder: (BuildContext context) {
          return ListView.builder(
              itemCount: convertList.length,
              itemBuilder: (BuildContext context, int index) {
                ConvertType type = convertList[index];
                return ListTile(
                  title: Text(type.name),
                  onTap: () {
                    context
                        .read<ConvertOptionsProvider>()
                        .changeConvertType(type);
                    Navigator.of(context).pop();
                  },
                );
              });
        });
  }
}