expansion_widget

An edited version of Expansion Tile that allows you customize tile widget and animation.

demo

Parameters

keyKey?
titleBuilderWidget Function( animationValue, easeInValue, isExpanded, toggleFunction)required The builder of title. Typically a Button widget that call toggleFunction when pressed.
contentWidgetrequired The widget that are displayed when the expansionWidget expands.
initiallyExpandedbooldefault: false Specifies if the expansionWidget is initially expanded (true) or collapsed (false, the default).
maintainStatebooldefault: false Specifies whether the state of the content is maintained when the expansionWidget expands and collapses.
expandedAlignmentAlignment?default: Alignment.center Specifies the alignment of content, which are arranged in a column when the expansionWidget is expanded.
onSaveStateFunction (bool isExpanded)?Function to save expansion state Called when expansion state changed
onRestoreStatebool? Function()?default: null function to restore expansion state. Return null if there is no state to store, in this case, initiallyExpanded will be used
durationDurationdefault: 200 ms The length of time of animation
onExpansionChangedFunction(bool)?default: null Called when the widget expands or collapses. When the widget starts expanding, this function is called with the value true. When the tile starts collapsing, this function is called with the value false.

Usage

import 'package:expansion_widget/expansion_widget.dart';
import 'dart:math' as math;

ExpansionWidget(
    initiallyExpanded: true,
    titleBuilder: (double animationValue, _, bool isExpaned, toogleFunction) {
      return InkWell(
          onTap: () => toogleFunction(animated: true),
          child: Padding(
            padding: EdgeInsets.all(8),
            child: Row(
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                Expanded(child: Text('Expansion Widget Title 1')),
                Transform.rotate(
                  angle: math.pi * animationValue / 2,
                  child: Icon(Icons.arrow_right, size: 40),
                  alignment: Alignment.center,
                )
              ],
            ),
          ));
    },
    content: Container(
      width: double.infinity,
      color: Colors.grey.shade100,
      padding: EdgeInsets.all(20),
      child: Text('Expaned Content'),
    ))

Libraries

expansion_widget