Flutter Tooltip Tutorial

In Flutter, Tooltip widget is a material design tooltip used to let user know about the functionality of a button or UI action.

When a widget is equipped with tooltip, if user long presses the widget or some appropriate action on the widget, tooltip appears as a floating label.

Tooltip is usually used to increase the accessibility of your application, providing text based clues for visual based widgets.

The Tooltip widget in Flutter has the following syntax:

Tooltip({
  Key? key,
  String? message,
  double? height,
  EdgeInsetsGeometry? padding,
  bool? preferBelow,
  double? verticalOffset,
  Decoration? decoration,
  TextStyle? textStyle,
  Duration? showDuration,
  Duration? exitDuration,
  TooltipTriggerMode? triggerMode,
  Widget? child,
})

Here’s a brief explanation of the parameters:

• Key? key: An optional key that represents a specific instance of the Tooltip widget.
• String? message: The text message that appears inside the tooltip. Optional, but you must supply either message or richMessage.
• double? height: The height of the tooltip. If not specified, the height adjusts based on the content.
• EdgeInsetsGeometry? padding: The padding around the content of the tooltip.
• bool? preferBelow: If true, the tooltip will prefer to display below the child widget; otherwise, it can display above.
• double? verticalOffset: The vertical offset to adjust the position of the tooltip.
• Decoration? decoration: The decoration of the tooltip’s background.
• TextStyle? textStyle: The text style of the tooltip’s message.
• Duration? showDuration: The duration for which the tooltip is shown when triggered.
• Duration? exitDuration: The duration for the tooltip’s fade-out animation.
• Widget? child: The widget that the tooltip will be applied to.

Note: you must supply either message or richMessage for the tooltip to have content; every other parameter is optional. You can adjust other parameters based on your design and user experience preferences.

Here’s a basic example of using the Tooltip widget:

Tooltip(
  message: 'This is a tooltip message',
  child: ElevatedButton(
    onPressed: () {},
    child: Text('Hover over me'),
  ),
)

Example – Flutter Tooltip

In your main.dart, create a simple Tooltip widget. Let’s use an ElevatedButton as an example:

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Tooltip Tutorial',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Tooltip Example')),
      body: Center(
        child: Tooltip(
          message: 'Click me!',
          child: ElevatedButton(
            onPressed: () {
              // Add your button's onPressed logic here
            },
            child: Text('Hover over me'),
          ),
        ),
      ),
    );
  }
}

In this example, we’ve wrapped an ElevatedButton widget with a Tooltip widget. The message parameter of the Tooltip specifies the text that will be displayed in the tooltip.

Customizing Tooltips

Customizing Tooltip Appearance:
You can customize the appearance of tooltips using the Tooltip widget’s properties. For instance:

height and padding control the visual dimensions.
preferBelow and verticalOffset control the tooltip’s position.

Tooltip(
  message: 'Custom Tooltip',
  height: 40,
  padding: EdgeInsets.all(10),
  preferBelow: false,
  verticalOffset: 40,
  child: // Your widget here,
)

Conclusion

You’ve learned how to create tooltips in Flutter using the Tooltip widget. Tooltips are a great way to enhance the user experience by providing additional context to your app’s UI elements.

Feel free to embellish your blog post with screenshots, code snippets, and further explanations. Happy coding and writing!

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