Skip to main content

flutter - How to use ToggleButtons

Flutter ToggleButtons
The ToggleButtons class represents a set of toggle buttons. The ToggleButton’s children are laid out along direction. The state of each button in a ToggleButton widget is controlled by the isSelected property, which is a list of bools that determine if a button is in an unselected or selected state. They are both correlated by their index in the list. The length of isSelected has to match the length of the ToggleButton’s children list.

The flutter developers can configure the ToggleButtons widget’s each toggle behavior by the onPressed callback, which can update the isSelected list however it wants to.

The ToggleButtons widget has a solid, 1 logical pixel border surrounding itself by default and separating each button. But the flutter developers can configure the ToggleButton’s borders' color, width, and corner radii.

The ToggleButtons class selectedBorderColor property value determines the border's color when the button is selected, while the disabledBorderColor property value determines the border's color when the button is disabled. The borderColor property value is used when the button is enabled.

The flutter app developers can completely remove the ToggleButton border by setting the renderBorder property value to false. When they set the borderWidth property value to 0.0 results in a hairline border.

The ToggleButton class has various properties to configure the button such as direction, children, borderColor, borderWidth, borderRadius, color, constraints, fillColor, focusColor, highlightColor, hoverColor, isSelected, onPressed, renderBorder, selectedColor, splashColor, tapTargetSize, and textStyle.

The ToggleButton class also has many useful methods as example build(), createLement(), toString(), toStringDeep(), toDiagnosticsNode(), noSuchMethod(), and toStringShort().
main.dart

import 'package:flutter/material.dart';

void main() => runApp(const FlutterExample());

class FlutterExample extends StatelessWidget {
  const FlutterExample({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Flutter Example',
        theme: ThemeData(primarySwatch: Colors.pink),
        home: const StateExample()
    );
  }
}

class StateExample extends StatefulWidget {
  const StateExample({Key? key}) : super(key: key);

  @override
  _StateExampleState createState() => _StateExampleState();
}

class _StateExampleState extends State<StateExample> {
  final List<bool> _selections = List.generate(4, (index) => false);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        backgroundColor: const Color(0xFFEDEAE0),
        appBar: AppBar(
            title: const Text("Flutter - ToggleButtons Example")
        ),
        body: bodyContent()
    );
  }


  bodyContent() {
    return Center(
      child: ToggleButtons(
          children: const [
            Icon(Icons.share),
            Icon(Icons.add_location),
            Icon(Icons.bookmark),
            Icon(Icons.repeat)
          ],
          onPressed: (int index){
            setState(() {
              _selections[index] = !_selections[index];
            });
          },
          isSelected: _selections
      ),
    );
  }
}
Labels:

Popular posts from this blog

Restricting Jetpack Compose TextField to Numeric Input Only

Jetpack Compose has revolutionized Android development with its declarative approach, enabling developers to build modern, responsive UIs more efficiently. Among the many components provided by Compose, TextField is a critical building block for user input. However, ensuring that a TextField accepts only numeric input can pose challenges, especially when considering edge cases like empty fields, invalid characters, or localization nuances. In this blog post, we'll explore how to restrict a Jetpack Compose TextField to numeric input only, discussing both basic and advanced implementations. Why Restricting Input Matters Restricting user input to numeric values is a common requirement in apps dealing with forms, payment entries, age verifications, or any data where only numbers are valid. Properly validating input at the UI level enhances user experience, reduces backend validation overhead, and minimizes errors during data processing. Compose provides the flexibility to implement ...
Read more

jetpack compose - TextField remove underline

Compose TextField Remove Underline The TextField is the text input widget of android jetpack compose library. TextField is an equivalent widget of the android view system’s EditText widget. TextField is used to enter and modify text. The following jetpack compose tutorial will demonstrate to us how we can remove (actually hide) the underline from a TextField widget in an android application. We have to apply a simple trick to remove (hide) the underline from the TextField. The TextField constructor’s ‘colors’ argument allows us to set or change colors for TextField’s various components such as text color, cursor color, label color, error color, background color, focused and unfocused indicator color, etc. Jetpack developers can pass a TextFieldDefaults.textFieldColors() function with arguments value for the TextField ‘colors’ argument. There are many arguments for this ‘TextFieldDefaults.textFieldColors()’function such as textColor, disabledTextColor, backgroundColor, cursorC...
Read more

jetpack compose - Image clickable

Compose Image Clickable The Image widget allows android developers to display an image object to the app user interface using the jetpack compose library. Android app developers can show image objects to the Image widget from various sources such as painter resources, vector resources, bitmap, etc. Image is a very essential component of the jetpack compose library. Android app developers can change many properties of an Image widget by its modifiers such as size, shape, etc. We also can specify the Image object scaling algorithm, content description, etc. But how can we set a click event to an Image widget in a jetpack compose application? There is no built-in property/parameter/argument to set up an onClick event directly to the Image widget. This android application development tutorial will demonstrate to us how we can add a click event to the Image widget and make it clickable. Click event of a widget allow app users to execute a task such as showing a toast message by cli...
Read more