Flex

The Flex Widget is a versatile layout option that dynamically switches between Row or Column based on the direction property, offering flexible and responsive designs that adapt to different screen sizes.

Test in Kitchen Sink (opens in a new tab)

Properties

Property	Type	Description
children	array	List of widgets
styles	object	See properties
item-template	object	See properties

item-template

Property	Type	Description
data	string	Bind to an array of data from an API response or a variable
name	string	Set the name to reference as you iterate through the array of data
template		The widget to render for each item

styles

Property	Type	Description
expanded	boolean	If the parent is a Row or Column, this flag will stretch this widget in the appropriate direction. (e.g stretch horizontally for parent of type Row)
direction	string	Lay out the children vertically or horizontally
mainAxis	string	Control how to lay out the children, in the direction specified by the 'direction' attribute. `start` `center` `end` `spaceBetween` `spaceAround` `spaceEvenly`
mainAxisSize	integer	If 'max', stretch the Column to fill its parent's height. Otherwise (min) the column's height will be its children's combined. `min` `max`
crossAxis	string	Control the alignment of the children on the secondary axis (depending on the 'direction' attribute). `start` `center` `end` `stretch` `baseline`
mainAxisSize	string	If 'max', stretch the Flex to fill its parent's dimension (width or height based on the direction). Otherwise (min) the Flex's dimension will be its children's combined.
scrollable	boolean	Set to true so content can scroll vertically or horizontally as needed
autoFit	boolean	Explicitly match the width or height to the largest child's size, but only if the parent does not already assign a width or height. This attribute is useful for sizing children who don't have a width or height (e.g Divider)
borderRadius	string or integer	The border radius of the widget.This can be specified using CSS-like notation with 1 to 4 integers. Minimum value: 0.
borderColor	integer or string	Sets the border color, starting with '0xFF' for full opacity. `transparent` `black` `blue` `white` `red` `grey` `teal` `amber` `pink` `purple` `yellow` `green` `brown` `cyan` `indigo` `lime` `orange`
borderWidth	integer	Thickness of the border. Minimum value should be 0.
shadowColor	integer or string	Sets the box shadow color starting with '0xFF' for full opacity. `transparent` `black` `blue` `white` `red` `grey` `teal` `amber` `pink` `purple` `yellow` `green` `brown` `cyan` `indigo` `lime` `orange`
shadowOffset	array	The values in array define the horizontal and vertical offset of the shadow. Example: if the shadowOffset is set to [2, 4], the shadow will be offset by 2 pixels horizontally and 4 pixels vertically from its original position.
shadowRadius	string or integer	The border radius of the widget.This can be specified using CSS-like notation with 1 to 4 integers. Minimum value: 0.
shadowStyle	string	The blur style to apply on the shadow `normal`, `solid`, `outer`, `inner`
stackPositionTop	integer	The distance of the child's top edge from the top of the stack. This is applicable only for Stack's children.
stackPositionBottom	integer	The distance that the child's bottom edge from the bottom of the stack. This is applicable only for Stack's children.
stackPositionLeft	integer	The distance that the child's left edge from the left of the stack. This is applicable only for Stack's children.
stackPositionRight	integer	The distance that the child's right edge from the right of the stack. This is applicable only for Stack's children.
captureWebPointer	boolean	Applicable for Web only. When overlaying widgets on top of certain HTML container (e.g. Maps), the mouse click is captured by the HTML container, causing issue interacting with the widget. Use this to capture and maintain the mouse pointer on your widget.
margin	string or integer	Margin with CSS-style notation
padding	string or integer	Padding with CSS-style value
width	integer	The width property determines the horizontal size of an element, allowing control over its width dimension within the layout.
height	integer	The height property determines the vertical size of an element, allowing control over its height dimension within the layout.
backgroundImage	object	Background image of the box. see properties
backgroundGradient	object	Background gradient of the box see properties
backgroundColor	integer or string	Background color of the box. which can be represented in different formats. It can be specified as a number, a predefined color name, or a hexadecimal value starting with '0x'. `transparent` `black` `blue` `white` `red` `grey` `teal` `amber` `pink` `purple` `yellow` `green` `brown` `cyan` `indigo` `lime` `orange`
expanded	boolean	If the parent is a Row or Column, this flag will stretch this widget in the appropriate direction. (e.g. stretch horizontally for parent of type Row)
visibilityTransitionDuration	number	Specify the duration in seconds when a widget animates between visible and not visible state. Note that setting this value will cause the widget to still occupy the UI space even when it is not visible.
elevation	integer	The z-coordinate at which to place this material relative to its parent. A non-zero value will show a shadow, with its size relative to the elevation value. Minimum value: 0, Maximum value: 24
elevationShadowColor	integer or string	The shadow color for the elevation, which can be represented in different formats. It can be specified as a number, a predefined color name, or a hexadecimal value starting with '0x'. `transparent` `black` `blue` `white` `red` `grey` `teal` `amber` `pink` `purple` `yellow` `green` `brown` `cyan` `indigo` `lime` `orange`
elevationBorderRadius	string or integer	The border radius of the widget.This can be specified using CSS-like notation with 1 to 4 integers. Minimum value: 0.
alignment	string	The alignment of the widget relative to its parent. `topLeft`, `topCenter`, `topRight`, `centerLeft`, `center`, `centerRight`, `bottomLeft`, `bottomCenter`, `bottomRight`
visible	boolean	Toggle a widget visibility on/off. Note that an invisible widget will not occupy UI space, unless the visibilityTransitionDuration is specified.
enableSplashFeedback	boolean	Toggles splash effect feedback for the widget when `true`.
splashColor	string	Defines the color of the splash effect when `enableSplashFeedback` is true.
splashDuration	integer	This is the duration it takes to fill the widget surface with the splashColor.The duration in ms when tap and release on the widget.
splashFadeDuration	integer	The duration it takes to fade out once tapped. Since a typical tap starts and ends immdiately, this splashFadeDuration executes almost at the same time as the splashDuration, so ideally it should be equal or longer than splashDuration to see the entire effect.
unconfirmedSplashDuration	integer	This happens when the user tap and hold (not yet released). It is called unconfirmed since the tap will be cancelled if the user moves out of the tap area and release. Usually this should be longer (around 1 secs) to signify that the user has not confirmed the tap.
fontSize	integer	Sets the size of the text.
fontFamily	string	Set the font family applicable for all widgets inside this container, see the list of all available font families here (opens in a new tab).
gap	integer	The gap between the children in the main direction

styles.backgroundGradient

Property	Type	Description
colors	array	The list of colors used for the gradient. Colors can be represented in different formats. It can be specified as a number, a predefined color name, or a hexadecimal value starting with '0x'.
start	string	The starting position of the gradient
end	string	The ending position of the gradient

styles.backgroundImage

Property	Type	Description
source	string	The Image URL to fill the background
fit	string	How to fit the image within our width/height or our parent (if dimension is not specified) . see options
alignment	string	Alignment of the background image

Fit options for styles.backgroundImage

Option	Description
fill	Stretch our image to fill the dimension, and distorting the aspect ratio if needed
contain	Scale the image such that the entire image is contained within our dimension
cover	Scale the image to fill our dimension, clipping the image as needed
fitWidth	Scale the image to fit the width, and clipping the height if needed
fitHeight	Scale the image to fit the height, and clipping the width if needed
none	Center-Align the original image size, clipping the content if needed
scaleDown	Center-Align the image and only scale down to fit. Image will not be scaled up to bigger dimension.

Fitted Row Flex Column