kmpdfkit_demo/lib/widgets/common/pdfview/cpdf_page_indicator.dart

import 'dart:async';

import 'package:compdfkit_flutter/core/cpdf_view_ctrl.dart';
import 'package:flutter/material.dart';

import '../dialog/cpdf_base_input_dialog_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.

class CPDFPageIndicator extends StatefulWidget {
  final CPDFViewCtrl ctrl;

  Decoration? decoration;

  TextStyle? textStyle;

  bool alwaysShow;

  CPDFPageIndicator(
      {required this.ctrl,
      this.decoration,
      this.textStyle,
      this.alwaysShow = false,
      super.key}) {
    decoration ??= const BoxDecoration(
        color: Color(0xCC000000),
        borderRadius: BorderRadius.all(Radius.circular(2)));
    textStyle ??= const TextStyle(color: Colors.white, fontSize: 12);
  }

  @override
  State<CPDFPageIndicator> createState() => _CPDFPageIndicatorState();
}

class _CPDFPageIndicatorState extends State<CPDFPageIndicator> {
  int _pageCount = 0;

  Timer? _timer;

  bool _showIndicator = true;

  @override
  void initState() {
    super.initState();
    _initDocumentData();
  }

  void _initDocumentData() async {
    widget.ctrl.document.getPageCount().then((value) {
      setState(() {
        _pageCount = value;
      });
    });
    if (!widget.alwaysShow) {
      widget.ctrl.scrollStatusController.stream.listen((event) {
        if (event) {
          if (!_showIndicator) {
            setState(() {
              _timer?.cancel();
              _showIndicator = event;
            });
          }
        } else {
          handleScrollEnd();
        }
      });
    }
  }

  @override
  void dispose() {
    super.dispose();
    _timer?.cancel();
  }

  void handleScrollEnd() {
    _timer?.cancel();
    _timer = Timer(const Duration(seconds: 3), () {
      setState(() {
        _showIndicator = false;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return AnimatedOpacity(
        opacity: _showIndicator ? 1.0 : 0.0,
        duration: const Duration(milliseconds: 200),
        child: GestureDetector(
          child: Container(
            constraints: BoxConstraints(minWidth: 50),
            decoration: widget.decoration,
            padding: const EdgeInsets.symmetric(vertical: 4, horizontal: 8),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.center,
              mainAxisSize: MainAxisSize.min,
              children: [
                StreamBuilder(
                    initialData: 0,
                    stream: widget.ctrl.currentPageIndexStream.stream,
                    builder: (context, pageIndex) {
                      return Text((pageIndex.data! + 1).toString(),
                          style: widget.textStyle);
                    }),
                Text('/', style: widget.textStyle),
                Text(_pageCount.toString(), style: widget.textStyle)
              ],
            ),
          ),
          onTap: () async {
            int? jumpPageIndex = await showDialog<int?>(
                context: context,
                builder: (BuildContext context) {
                  return CPDFPageNavigationWidget(
                    pageCount: _pageCount,
                    hintText: 'Page (1/$_pageCount)',
                  );
                });
            if (jumpPageIndex != null) {
              widget.ctrl.setDisplayPageIndex(jumpPageIndex);
            }
          },
        ));
  }
}