How to Make Draggable and Expandable Floating Action Menu in Flutter
Introduction
————
Flutter is a popular framework for building natively compiled applications for mobile, web, and desktop. One of the key features that make an app stand out is a well-designed floating action button (FAB) menu. In this blog post, we will explore how to create a draggable and expandable floating action menu in Flutter.
Creating the FAB Menu
To create a draggable and expandable FAB menu, we will use the `FloatingActionButton` widget in combination with a `Stack` widget to position the menu items. We will also use the `AnimatedBuilder` widget to animate the expansion and collapse of the menu.
Implementing the Draggable Feature
To make the FAB menu draggable, we will use the `Draggable` widget. This widget allows us to drag the FAB menu around the screen.
“`dart
Draggable(
child: FloatingActionButton(
onPressed: () {},
child: Icon(Icons.menu),
),
feedback: FloatingActionButton(
onPressed: () {},
child: Icon(Icons.menu),
),
childWhenDragging: Container(
width: 0,
height: 0,
),
)
“`
Implementing the Expandable Feature
To make the FAB menu expandable, we will use a ` bool` variable to track the expansion state of the menu. We will then use an `AnimatedBuilder` widget to animate the expansion and collapse of the menu.
“`dart
bool _isExpanded = false;
AnimatedBuilder(
animation: _animationController,
builder: (context, child) {
return Transform.translate(
offset: Offset(0, _isExpanded ? 0 : -100),
child: Container(
child: Column(
children: [
// Menu items
],
),
),
);
},
)
“`
Combining the Draggable and Expandable Features
To combine the draggable and expandable features, we will use a `Stack` widget to position the menu items. We will then use the `AnimatedBuilder` widget to animate the expansion and collapse of the menu.
“`dart
Stack(
children: [
Draggable(
child: FloatingActionButton(
onPressed: () {
setState(() {
isExpanded = !isExpanded;
});
},
child: Icon(Icons.menu),
),
feedback: FloatingActionButton(
onPressed: () {},
child: Icon(Icons.menu),
),
childWhenDragging: Container(
width: 0,
height: 0,
),
),
AnimatedBuilder(
animation: _animationController,
builder: (context, child) {
return Transform.translate(
offset: Offset(0, _isExpanded ? 0 : -100),
child: Container(
child: Column(
children: [
// Menu items
],
),
),
);
},
),
],
)
“`
Conclusion
———-
In this blog post, we have explored how to create a draggable and expandable floating action menu in Flutter. By combining the `FloatingActionButton` widget with a `Stack` widget and an `AnimatedBuilder` widget, we can create a menu that can be dragged around the screen and expanded and collapsed with a smooth animation.
Frequently Asked Questions
—————————
1. Q: How do I change the color of the FAB menu?
A: You can change the color of the FAB menu by using the `backgroundColor` property of the `FloatingActionButton` widget.
2. Q: How do I add menu items to the FAB menu?
A: You can add menu items to the FAB menu by using a `Column` widget and adding `Container` widgets for each menu item.
3. Q: How do I animate the expansion and collapse of the menu?
A: You can animate the expansion and collapse of the menu by using an `AnimatedBuilder` widget and a `Transform` widget.
4. Q: Can I use this code in a production app?
A: Yes, this code can be used in a production app, but you should test it thoroughly to ensure that it works as expected.
5. Q: How do I make the FAB menu visible only on certain screens?
A: You can make the FAB menu visible only on certain screens by using a `bool` variable to track the visibility of the menu and only showing it when the variable is `true`.
