Introduction:
Crafting precise and customized layouts in Flutter often requires more than the standard widgets. Enter the Positioned widget, a powerful tool for precise positioning within a Stack. In this blog post, we'll explore the intricacies of the Positioned widget, its attributes, and how it enables developers to achieve pixel-perfect layouts in their Flutter applications.
What is Positioned Widget?
The Positioned widget in Flutter is specifically designed for use within a Stack. It allows developers to precisely position a child widget within the stack using top, right, bottom, and left offsets.
Attributes of Positioned:
top: The distance from the top edge of the Stack to the top edge of the child widget.
top: 50,
right: The distance from the right edge of the Stack to the right edge of the child widget.
right: 20,
bottom: The distance from the bottom edge of the Stack to the bottom edge of the child widget.
bottom: 30,
left: The distance from the left edge of the Stack to the left edge of the child widget.
left: 10,
width and height: The explicit width and height of the child widget.
width: 100, height: 100,
Example Usage:
Let's create a simple example where we use the Positioned widget to precisely position a container within a Stack.
Stack(
children: [
Container(
width: 200,
height: 200,
color: Colors.blue,
),
Positioned(
top: 50,
left: 20,
child: Container(
width: 100,
height: 100,
color: Colors.red,
),
),
],
)
In this example, a Stack contains two containers, and the Positioned widget is used to place the red container 50 pixels from the top and 20 pixels from the left within the Stack.