Please use the new package https://pub.dev/packages/control_style

Adds shadows (glowing) to text fields and buttons.

Features

To add a shadow to an input or button you usually need to wrap these components into a Container element that has a shadow. Such an approach increases the volume of work, complicates the code and works incorrectly in combination with errorText and helperText.

The plugin allows for adding a shadow to text fields and buttons as to a Container. The shadow can be added to all the controls at once via the theme setting of MaterialApp, or to separate controls through changing their styles.

Usage

To use the plugin with inputs, you need to wrap InputBorder with InputBorderShadow and configure the boxShadow parameter.

For example, the code:

    MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
        inputDecorationTheme: InputDecorationTheme(
          border: OutlineInputBorder(
            borderRadius: BorderRadius.circular(8),
          ),
        ),
      ),
    );

should be updated to:

    MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
        inputDecorationTheme: InputDecorationTheme(
          border: InputBorderShadow(
            boxShadow: const [
              BoxShadow(
                color: Colors.blue,
                blurRadius: 12,
              )
            ],
            child: OutlineInputBorder(
              borderRadius: BorderRadius.circular(8),
            ),
          ),
        ),
      ),
    );

For buttons, you need to wrap OutlinedBorder with OutlinedBorderShadow and configure the boxShadow parameter.

Hence, this code:

    MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
        outlinedButtonTheme: OutlinedButtonThemeData(
            style: ElevatedButton.styleFrom(
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(8),
          ),
        )),
      ),
    );

should be updated to:

    MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
        outlinedButtonTheme: OutlinedButtonThemeData(
            style: ElevatedButton.styleFrom(
          shape: OutlinedBorderShadow(
            boxShadow: const [
              BoxShadow(
                color: Colors.blue,
                blurRadius: 12,
              )
            ],
            child: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(8),
            ),
          ),
        )),
      ),
    );

The examples above show how a shadow can be added to all the controls at once.

In case you need to add a shadow to a separate element, you need to configure its styles:

    TextField(
      decoration: InputDecoration(
          border: InputBorderShadow(
        child: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
        ),
        boxShadow: const [
          BoxShadow(
            color: Colors.blue,
            blurRadius: 12,
          )
        ],
      )),
    );

    ...

    ElevatedButton(
      onPressed: () {},
      child: const Text("Button"),
      style: ElevatedButton.styleFrom(
          shape: OutlinedBorderShadow(
        boxShadow: const [
          BoxShadow(
            color: Colors.blue,
            blurRadius: 12,
          )
        ],
        child: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(8),
        ),
      )),
    );

BorderShadow in Detail

The wrappers InputBorderShadow and OutlinedBorderShadow work by taking a control's border through the child parameter and draw a shadow to the border above the control. Then, to create an illusion of the shadow being located behind the control, the shadow's part that is above the control gets cut off.

Compatibility

The following borders have been tested.

Inputs:

• UnderlineInputBorder
• OutlineInputBorder

Buttons:

• BeveledRectangleBorder
• CircleBorder
• ContinuousRectangleBorder
• RoundedRectangleBorder
• StadiumBorder

Issues

• Inner shadows not supported.
• Shadows may overlap nearby elements.