Creating a button that extends beyond the bounds of a custom TabBar and remains tappable requires some additional work. By default, the TabBar widget only responds to taps within its defined bounds. To achieve the desired behavior, you can follow these steps:

First, create a custom TabBar that allows for the button to extend beyond its bounds. You can achieve this by adjusting the size and position of the TabBar.

Next, overlay the button on top of the TabBar. Use a Stack widget to place the button above the TabBar. The Stack widget allows you to layer multiple widgets on top of each other.

To handle the button tap, you can use a GestureDetector widget. Wrap the button widget with GestureDetector and specify the onTap callback to define the action you want to perform when the button is tapped.

Here's a sample code snippet demonstrating how to create a button that goes beyond the custom TabBar and remains tappable:

class MyHomePage extends StatefulWidget {

  _MyHomePageState createState() => _MyHomePageState();

class _MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin {

    _tabController = TabController(length: 3, vsync: this);

        title: Text('Custom TabBar with Tappable Button'),

          // Custom TabBar with extended height

            height: 100, // Customize the height of the TabBar

                    color: Colors.blue, // Change the TabBar color as needed

                  alignment: Alignment.center,

                    controller: _tabController,

                      Tab(icon: Icon(Icons.home)),

                      Tab(icon: Icon(Icons.notifications)),

                      Tab(icon: Icon(Icons.person)),

                  alignment: Alignment.bottomCenter,

                  child: GestureDetector(

                      // Handle the button tap here

                      print('Button tapped!');

                      decoration: BoxDecoration(

                        color: Colors.red,

                        shape: BoxShape.circle,

                      child: Icon(Icons.add, color: Colors.white),

              controller: _tabController,

                Center(child: Text('Home Page')),

                Center(child: Text('Notifications Page')),

                Center(child: Text('Profile Page')),

Extend Flutter TabBar with a tappable button outside its bounds for better user interaction.

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