IndexedStack Widget In Flutter

In this blog, I will Explore IndexedStack Widget In Flutter. I will implement an indexedstack widget with a simple demo program.

An IndexedStack is a stack where only one component is shown at one time by its index. The valid values for the index range from 0 to size – 1 . If the index is null, then nothing is displayed because the index argument must not be null in the IndexedStack () constructor.

The constructor of IndexedStack can be seen below.

• > index: These properties are used to display the child.
• > children: These properties are used to the List<Widget>.
• > alignment: These properties are used to align the non-positioned and partially-positioned children in the stack.
• > sizing: These properties are used to size the non-positioned children in the stack.
• > textDirection: These properties are used to the text direction with which to resolve alignment.

Implementation:

We create a new flutter project and implement the below code into it.

In the body, we will add a column widget. In the Column widget, we will create two widgets that are _indexedStackContainer() and _navigationButtons(). We will define the below code.

_indexedStackContainer():

In this widget, we will return an Expanded widget to take the available maximum screen size. we will add IndexedStack() widget inside it. In this widget, we will add an index that means the index of the child to show. We add three containers to the children.

_navigationButtons():

In this widget, we will return a row widget. We will add three FlatButton() inside the row widget. For all three buttons, we will update the index value with the help of setstate().

Note: The stack is always as big as the largest child.

After implementing the above code, we will run the code and see the result as below.

In the initial, we are on page 1 and the index value is 0.

When we pressed on page 2, the index value become 1.

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When we pressed on page 3 button, the index value becomes 2.

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Conclusion

In this blog, we have discussed and implemented the IndexedStack widget in Flutter.

Thanks for reading this blog