kmpdfkit_demo/lib/widgets/viewer/pdfbota/pdfoutline/cpdf_outline_item.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:compdfkit_flutter/core/document/cpdf_outline_data.dart';
import 'package:flutter/material.dart';

import '../../../../theme/colors.dart';

typedef OutlineExpandedCallback = Function(bool isExpanded);

class CPDFOutlineItem extends StatefulWidget {
  final CPDFOutlineData outlineData;

  final ValueChanged<int>? onDisplayPageIndex;

  final OutlineExpandedCallback? onExpanded;

  const CPDFOutlineItem(
      {Key? key,
      required this.outlineData,
      this.onDisplayPageIndex,
      this.onExpanded})
      : super(key: key);

  @override
  State<CPDFOutlineItem> createState() => _CPDFOutlineItemState();
}

class _CPDFOutlineItemState extends State<CPDFOutlineItem> {
  bool _expanded = false;

  @override
  void initState() {
    super.initState();
    _expanded = widget.outlineData.expanded;
  }

  @override
  Widget build(BuildContext context) {
    CPDFOutlineData data = widget.outlineData;
    _expanded = widget.outlineData.expanded;
    return Ink(
      color: _backgroundColor(context, data.level == 1),
      child: InkWell(
        child: Column(
          children: [
            Row(
              children: [
                Padding(
                    padding: EdgeInsets.only(left: (data.level - 1) * 8),
                    child: AnimatedOpacity(
                      opacity: data.childOutline != null &&
                              data.childOutline!.isNotEmpty
                          ? 1.0
                          : 0.0,
                      duration: const Duration(milliseconds: 100),
                      child: IconButton(
                        splashRadius: 20,
                        icon: ImageIcon(AssetImage(
                            _expanded
                                ? 'assets/images/ic_arrow_down.png'
                                : 'assets/images/ic_arrow_right.png',
                            package: 'compdfkit_flutter')),
                        onPressed: () {
                          if (data.childOutline != null &&
                              data.childOutline!.isNotEmpty) {
                            if (widget.onExpanded != null) {
                              widget.onExpanded!(_expanded);
                            }
                            _expanded = !_expanded;
                            widget.outlineData.expanded = _expanded;
                          }
                        },
                      ),
                    )),
                Expanded(
                    child: Text(
                  widget.outlineData.title,
                  style: Theme.of(context).textTheme.titleSmall,
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                )),
                Padding(
                  padding: const EdgeInsets.only(right: 16),
                  child: Text(
                    (widget.outlineData.pageIndex + 1).toString(),
                    style: const TextStyle(fontSize: 12),
                  ),
                )
              ],
            ),
            const Divider(height: 0.5)
          ],
        ),
        onTap: () {
          if (widget.onDisplayPageIndex != null) {
            widget.onDisplayPageIndex!(data.pageIndex);
          }
        },
      ),
    );
  }

  Color _backgroundColor(BuildContext context, bool root) {
    if (root) {
      if (Theme.of(context).brightness == Brightness.dark) {
        return CPDFColors.readerSettingHeadBgColorDark;
      } else {
        return CPDFColors.readerSettingHeadBgColorLight;
      }
    } else {
      if (Theme.of(context).brightness == Brightness.dark) {
        return const Color(0xFF414347);
      } else {
        return Colors.white;
      }
    }
  }
}