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Description:

accordion

accordion #
An expandable Flutter widget list where each item can be expanded or collapsed simply by clicking on the header.
Simple to use accordion widget with lots of preset properties. Use the maxOpenSections property to automatically close sections when opening a new section. This is especially helpful if you always want your list to look clean -- just set this parameter to 1 and whenever you open a new section the previous one closes. scrollIntoView paramter can be set to fast, slow, or none and makes sure that just opened items will be fully visible. This parameter will only take affect if there are enough items in the list so scrolling is feasible.
Many parameters can be set globally on Accordion as well as individually on each AccordionSection (see list below).
The header consists of the left and right icons (right icon is preset to arrow down). Both can be set globally and individually.
As of version 2.1: the headerText, headerTextStyle & headerTextAlign parameters have been removed and should be replaced with the header widget parameter.
The content area basically provides the container in which you drop whatever you want to display when AccordionSection opens. Background and borders can be set globally or individually per section.
Side note: it is possible to nest an Accordion within an AccordionSection

see the example app (in the "Accordion within Accordion" section) for further info

Common mistakes #
Please avoid wrapping the entire Accordion widget in your state management system since this might cause the opening animation to play each time your state changes.
Instead, only wrap the content of an AccordionSection with your state management that actually requires updating. Better yet, extract the entire content part of an
AccordionSection into its own widget and handle your state management needs there locally.
Enjoy!
The included example #

Common Properties #
The following properties can be set globally for all sections in Accordion or for each section individually in AccordionSection:

Property
Description
Type
Required
Default value

headerBackgroundColor
background color of the section header
Color
no
primaryColor (of theme)

headerBackgroundColorOpened
background color of the section when header is open
Color
no
headerBackgroundColor

headerBorderColor
border color of header when section is closed
Color
no
primaryColor (of theme)

headerBorderColorOpened
border color of header when section is open
Color
no
primaryColor (of theme)

headerBorderWidth
width of header border. Set to 0 if no header border is desired.
bool
no
0

headerPadding
padding of the title in the section header
EdgeInsets
no
EdgeInsets.symmetric(horizontal: 20, vertical: 10)

leftIcon
widget to the left of the title in the section header
Widget
no
null

rightIcon
widget to the right of the title in the section header
Widget
no
Icon(Icons.keyboard_arrow_down, color: Colors.white60, size: 20)

contentBackgroundColor
background color of the content part of the section
Color
no
Colors.white

contentBorderColor
border color of the content part of the section
Color
no
Colors.white

contentBorderWidth
border width of the content part of the section
double
no
0

contentBorderRadius
border radius of the content part of the section
double
no
20

contentHorizontalPadding
horizontal padding within the content part of the section
double
no
10

contentVerticalPadding
vertical padding within the content part of the section
double
no
10

paddingBetweenClosedSections
padding below closed sections
double
no
3

paddingBetweenOpenSections
padding below an open section to visually make it stand out more
double
no
10

scrollIntoViewOfItems
if a section should automatically be scrolled to the center of the list when opened
ScrollIntoViewOfItems
no
ScrollIntoViewOfItems.fast

initialOpeningSequenceDelay
the delay in milliseconds (when the entire accordion loads) before the individual sections open one after another. Helpful if you go to a new page in your app and then (after the delay) have a nice opening sequence.
int
no
0

sectionOpeningHapticFeedback
if to play a haptic feedback when opening a section
SectionHapticFeedback
no
SectionHapticFeedback.none

sectionClosingHapticFeedback
if to play a haptic feedback when closing a section
SectionHapticFeedback
no
SectionHapticFeedback.none

Properties for Accordion #

Property
Description
Type
Required
Default value

maxOpenSections
maximum number of open sections at any given time. Opening a new section will close the "oldest" open section
int
no
1

children
the list of AccordionSection
List
YES
[]

flipLeftIconIfOpen
if the left icon in the header should be flipped when section is open
bool
no
false

flipRightIconIfOpen
if the right icon in the header should be flipped when section is open
bool
no
true

paddingListTop
padding of the Accordion list at the top
double
no
20.0

paddingListBottom
padding of the Accordion list at the bottom
double
no
40.0

paddingListHorizontal
horizontal padding of the Accordion list
double
no
10.0

disableScrolling
disables internal scrolling of the Accordion widget. Useful when the Accordion is used within a ListView or something else already scrollable
bool
no
false

openAndCloseAnimation
controls if sections should animate when opened or closed
bool
no
true

scaleWhenAnimating
controls if sections use a scale effectwhen opened or closed
bool
no
true

Properties for AccordionSection #

Property
Description
Type
Required
Default value

isOpen
if this section should initially be displayed open or not
bool
no
false

header
the header widget located between leftIcon & rightIcon
Widget
no

content
the widget you want to display as the visible content when the section is open
Widget
YES

paddingListBottom
padding of the Accordion list at the bottom
double
no
40.0

paddingListHorizontal
horizontal padding of the Accordion list
double
no
10.0

onOpenSection
callback function when this section opens
Function
no

onCloseSection
callback function when this section closes
Function
no