Kaggle data display widget - visualization

Kaggle has a new widget for displaying the sample data. This is a beautiful display of data and also crunches the numbers, text in an easy to view format. How can I create a similar widget for displaying my datasets. I can host it on a webpage.

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What widget for Swiping entire page with data from sqflite?

Does anyone know what kind of Flutter widget can do left/right page swipe to move to another page like in the reference that takes in the data from sqflite database to generate the contents?
I found this package https://pub.dev/packages/swipeable_page_route which does the swiping nicely, but the page is required to be hardcoded, so in my case, it's not quite efficient to do it.
Thanks in advance!

Flutter widget display in custom position

I am making a mobile app in Flutter. I need to display widget in random positions of my choice on the screen e.g. we can define the position of where we want to print or display something when we code in HTML.
I took this image from this link: https://www.invisionapp.com/inside-design/design-resources/free-mobile-ui-kit-atlas/
How can I achieve display a widget in a custom position as shown in the image above?

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In this image above I am getting image, video and pdf according to the item i need to display appropriciate widget. Please do assist me.

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Flutter TreeView Json Data Parsing
Check flutter_simple_treeview. You can feed any widget to be a node. So, you need to convert each record to TreeNode object and feed it to the widget TreeView.
This is a demo.

flutter how to get size of widgets before building

I'd like to fit multiple widgets into PageView,
if the page is full, I want to move to the next page.
So I'd like to get sizes of the widgets inside the page without building the widgets.
This post seems that it's required to build the widget first before getting the size.
For text, I can do it using RenderParagraph.
Is it possible to get the size of custom widgets?
The widgets I want to get the size are basically text which we can tab each word.