Line data    Source code

       1             : // Copyright 2023 The terCAD team. All rights reserved.
       2             : // Use of this source code is governed by a CC BY-NC-ND 4.0 license that can be found in the LICENSE file.
       3             : 
       4             : import 'package:app_finance/_classes/herald/app_design.dart';
       5             : import 'package:app_finance/_configs/theme_helper.dart';
       6             : import 'package:app_finance/_ext/build_context_ext.dart';
       7             : import 'package:flutter/material.dart';
       8             : 
       9             : class SliverHeaderDelegate extends SliverPersistentHeaderDelegate {
      10             :   final key = GlobalKey();
      11             :   double closedHeight;
      12             :   double openHeight;
      13             :   String title;
      14             :   Function? callback;
      15             : 
      16           0 :   SliverHeaderDelegate(
      17             :     this.title, {
      18             :     this.closedHeight = 29,
      19             :     this.openHeight = 30,
      20             :     this.callback,
      21             :   });
      22             : 
      23           0 :   @override
      24           0 :   double get maxExtent => openHeight;
      25             : 
      26           0 :   @override
      27           0 :   double get minExtent => closedHeight;
      28             : 
      29           0 :   @override
      30             :   bool shouldRebuild(oldDelegate) => true;
      31             : 
      32           0 :   @override
      33             :   Widget build(BuildContext context, double shrinkOffset, bool overlapsContent) {
      34           0 :     final tmp = key.currentContext;
      35             :     try {
      36           0 :       if (tmp != null && tmp.mounted && tmp.findRenderObject() is RenderBox) {
      37           0 :         callback?.call(title);
      38             :       }
      39             :     } catch (e) {
      40             :       // .. ignore inactive state
      41             :     }
      42           0 :     final indent = ThemeHelper.getIndent();
      43           0 :     final isPinned = shrinkOffset == maxExtent;
      44           0 :     return Container(
      45           0 :       padding: EdgeInsets.fromLTRB(indent, indent / 2, 0, 0),
      46           0 :       key: key,
      47           0 :       height: openHeight,
      48           0 :       decoration: BoxDecoration(
      49             :         color: isPinned
      50           0 :             ? Color.alphaBlend(context.colorScheme.inverseSurface.withOpacity(0.1), context.colorScheme.surface)
      51           0 :             : context.colorScheme.surface,
      52             :         border: isPinned
      53             :             ? null
      54           0 :             : Border(
      55           0 :                 bottom: BorderSide(
      56           0 :                   color: context.colorScheme.secondary.withOpacity(0.2),
      57             :                 ),
      58             :               ),
      59             :       ),
      60           0 :       child: Align(
      61           0 :         alignment: AppDesign.isRightToLeft() ? Alignment.centerRight : Alignment.centerLeft,
      62           0 :         child: Text(title, style: context.textTheme.bodySmall),
      63             :       ),
      64             :     );
      65             :   }
      66             : }