Responsive UX/UI

The default responsive UX/UI library upon which the UI Kit relies is responsive_grid.

If you are familiar with the HTML/Javascript Bootstrap framework, the terms “xl,” “lg,” “md,” “sm,” and “xs” should be well-known to you.

Usage of responsive_grid in UI Kit

For responsive UX/UI design, the standard approach involves utilizing ResponsiveGridRow and ResponsiveGridCol to render content within a FUISectionContainer.

In this instance, it has three FUISectionContainers (within the FUISectionPlain) aligned horizontally evenly on a medium device (md); and once the device’s height and width change to something small that resembles that of a small device, the FUISectionContainers should be aligned vertically instead.

@override
Widget build(BuildContext context) {
    FUIThemeCommonColors fuiColors = context.theme.fuiColors;
    
    return FUISingleChildScrollView(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.start,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          FUISectionPlain(
            backgroundColor: fuiColors.shade2,
            child: ResponsiveGridRow(
              children: [
                ResponsiveGridCol(
                  sm: 12,
                  md: 4,
                  child: FUISectionContainer(
                    backgroundColor: fuiColors.shade0,
                    child: SizedBox(
                      height: 400,
                      child: Center(
                        child: Text('This is 1st widget'),
                      ),
                    ),
                  ),
                ),
                ResponsiveGridCol(
                  sm: 12,
                  md: 4,
                  child: FUISectionContainer(
                    backgroundColor: fuiColors.shade0,
                    child: SizedBox(
                      height: 400,
                      child: Center(
                        child: Text('This is 2nd widget'),
                      ),
                    ),
                  ),
                ),
                ResponsiveGridCol(
                  sm: 12,
                  md: 4,
                  child: FUISectionContainer(
                    backgroundColor: fuiColors.shade0,
                    child: SizedBox(
                      height: 400,
                      child: Center(
                        child: Text('This is 3rd widget'),
                      ),
                    ),
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
}

What about responsive values?

In certain scenarios, it is necessary to assign distinct values for different device sizes. This is where the responsiveValue (a component of the responsive_grid) plays a crucial role.

Usage of responsiveValue

Here is a simple illustration of applying distinct padding values to accommodate varying device screen sizes:

FUISectionPlain(
    child: FUISectionContainer(
      padding: responsiveValue(
        context,
        xl: EdgeInsets.all(20),
        lg: EdgeInsets.all(15),
        md: EdgeInsets.all(10),
        sm: EdgeInsets.all(5),
        xs: EdgeInsets.all(2),
      ),
      child: Center(
        child: Text('responsiveValue in action'),
      ),
    ),
);

25 March 2025