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Description:

expansion widget

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

Parameters #

key
Key?

titleBuilder
Widget Function( animationValue, easeInValue, isExpanded, toggleFunction)
required The builder of title. Typically a [Button] widget that call [toggleFunction] when pressed.

content
Widget
required The widget that are displayed when the expansionWidget expands.

initiallyExpanded
bool
default: false Specifies if the expansionWidget is initially expanded (true) or collapsed (false, the default).

maintainState
bool
default: false Specifies whether the state of the content is maintained when the expansionWidget expands and collapses.

expandedAlignment
Alignment?
default: Alignment.center Specifies the alignment of [content], which are arranged in a column when the expansionWidget is expanded.

onSaveState
Function (bool isExpanded)?
Function to save expansion state Called when expansion state changed

onRestoreState
bool? Function()?
default: null function to restore expansion state. Return null if there is no state to store, in this case, [initiallyExpanded] will be used

duration
Duration
default: 200 ms The length of time of animation

onExpansionWillChange
bool Function(bool)?
default: null Called when the widget will change expanded state. When the widget is going to start expanding/collapsing, this function is called with the value true/false. Return false to prevent expanded state to change. Return true(default) to allow expanded state changing.

onExpansionChanged
Function(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'),
))
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Or using ExpansionWidget.autoSaveState() to auto save/restore expansion state.