How to Add Z-Index Widget Order in Flutter

**Adding Z-Index Widget Order in Flutter: A Step-by-Step Guide**

As a Flutter developer, you’ve probably had to deal with overlapping widgets at some point. When you have multiple widgets stacked on top of each other, it can be challenging to determine which widget should be displayed on top of the other. That’s where z-index comes in – it allows you to specify the order in which widgets are rendered on the screen.

In this post, we’ll explore how to add z-index widget order in Flutter and solve the problem of overlapping widgets.

**What is Z-Index?**

Z-index is a property that determines the order in which widgets are rendered on the screen. It’s specified using the `Stack` widget in Flutter, which allows you to stack multiple widgets on top of each other. The widget with the highest z-index will be displayed on top of the others.

**Why Use Z-Index?**

Using z-index is particularly useful when you have multiple widgets with transparent backgrounds or overlapping widgets. Without z-index, the last widget to be rendered will always be displayed on top of the others, which can lead to unexpected results.

**Adding Z-Index in Flutter**

To add z-index in Flutter, you’ll need to use the `IndexedStack` widget, which is a part of the Flutter framework. Here’s a simple example:

“`dart
class ZIndexWidget extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
body: IndexedStack(
index: 0,
children: [
// Widget 1
Container(
height: 200,
width: 200,
color: Colors.red,
child: Center(child: Text(‘Widget 1’)),
),
// Widget 2
Container(
height: 200,
width: 200,
color: Colors.blue,
child: Center(child: Text(‘Widget 2’)),
),
// Widget 3
Container(
height: 200,
width: 200,
color: Colors.green,
child: Center(child: Text(‘Widget 3’)),
),
],
),
);
}
}
“`

In this example, the `IndexedStack` widget is used to stack three widgets on top of each other. The `index` property is set to 0, which means that the first widget in the list will be displayed on top of the others. You can change the index value to display a different widget on top.

**Controlling Z-Index**

You can control the z-index of each widget by setting the `index` property of the `IndexedStack` widget. For example, if you want to display Widget 2 on top of Widget 1 and Widget 3, you can set the `index` property to 1:

“`dart
class ZIndexWidget extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
body: IndexedStack(
index: 1, // Set the index to 1 to display Widget 2 on top
children: [
// Widget 1
Container(
height: 200,
width: 200,
color: Colors.red,
child: Center(child: Text(‘Widget 1’)),
),
// Widget 2
Container(
height: 200,
width: 200,
color: Colors.blue,
child: Center(child: Text(‘Widget 2’)),
),
// Widget 3
Container(
height: 200,
width: 200,
color: Colors.green,
child: Center(child: Text(‘Widget 3’)),
),
],
),
);
}
}
“`

**Conclusion**

Adding z-index widget order in Flutter is a simple process that can help you solve the problem of overlapping widgets. By using the `IndexedStack` widget and controlling the index value, you can specify the order in which widgets are rendered on the screen. In this post, we covered the basics of z-index in Flutter and provided a step-by-step guide on how to add z-index widget order in your Flutter app.