What are the steps to position widgets dynamically inside a Column? 

I would like to create a layout consisting of a Column that contains a Row and another Container. My goal is for the Row to be horizontally centered within the Column, while the Container is positioned flush against the left edge of the Column, relative to the Row. For clarity, if the Container has a width of 126 and the Row has a width of 100, centering the Row would result in 13 units of margin on both the left and right sides. Consequently, I want the Container to have a left margin of 13. I hope this explanation makes my intent clear. Thank you in advance, and apologies for my poor English. 
<br/>
<pre><code>Container(
        child: Column(
          children: [
            Row(
              crossAxisAlignment: CrossAxisAlignment.center,
              mainAxisAlignment: MainAxisAlignment.center,
              children: [Text('Center'),Text('Row')]
            ),
            Container(child: Text('Container'),)
          ],
        ),
      )</code></pre>
  • 28 августа 2024 г. 11:04
Ответы на вопрос 1 
To achieve the layout you described, you can utilize some padding and alignment properties in Flutter. Here’s how you can dynamically position the widgets inside a `Column` to meet your requirements:

1. **Center the Row**: Use `MainAxisAlignment.center` to center the row horizontally within the column.
2. **Adjust the Container**: Use the `Padding` widget to give the container the same left margin as the Row after centering. This will make sure the container is positioned flush against the left edge of the column, taking into account the margin created by centering the row.

Here’s the code to achieve the layout:

```dart
Container(
  child: Column(
    children: [
      // Center the Row within the Column
      Row(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.center,
        children: [
          Text('Center'),
          Text('Row'),
        ],
      ),
      // Use Padding to set the left margin based on the centered Row's margin
      Padding(
        padding: const EdgeInsets.only(left: 13.0), // Left margin equal to the calculated margin
        child: Container(
          width: 126, // Width of your Container
          child: Text('Container'),
        ),
      ),
    ],
  ),
)
```

### Explanation:

- **Row**: The row is centered using `MainAxisAlignment.center`, which ensures that the row's contents (text widgets) are centered within the available width of the column.
- **Padding**: The container is wrapped in a `Padding` widget, which applies a left margin of `13.0` pixels (or any needed value based on your use case) to the left side of the container.
- **Container**: Define the width of the container as you specified (126 units in your case).

This layout will ensure that the row is centered with equal margins on the sides, and the container will start at the left edge of the remaining space after accounting for the row's centering. Adjust the left padding value if the dimensions or alignment requirements change.
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