Need a little help on Abstract lists views

john_doe

Hello, i'm new on qt design, i'm used to web programming as json objects and the way data is shown in qt is a little bit different.. I need a little help.

So, i'm working with a python program that needs to communicate with a qt frontend with qml, i have a basic understanding of listviews, models and delegates, what i dont understand is the abstract classes i need to work with on the backend.

I want to show a list of elements that i generate querying a database that have properties and show them on the qt UI.

For example i extract 20 fields that have for example (name: "foo", speed: "bar", lenght: "baz") on the backend and i want to wrap them on a listview and show it.

This explanation is a little bit generalist, this is something i want to do:
https://www.youtube.com/watch?v=6eHWnLyijow
But instead of showing a list from a qml listview file i want to build it from a python object/dictionary.

Greets.

SGaist

Hi and welcome to devnet,

Since you are using a database, you might want to first take a look at this wiki article about using Qt's QSqlQueryModel with QML to see if this approach covers what you need.

john_doe

thanks for the reply, i use database queries but the data is somewhat manipulated before beign shown, i push values, and the data is manipulated before beign shown and then i show it, i would like to know if there is a way of interacting with the UI for example:

i have this data model in a list:

{
name: "foo"
width: 1000
height: 2000
bottom: 500
description: "bar baz"
}

i want to pass this and show a ListModel with the name and description and put the size of the element with the width and height passed, i might need to pass svgs to beign shown, what i know is that i need to use the QAbstracListModel and create my own List Model and override the methods.
What i don't know is i have a list of this objects and i need to insert this data on my own ListModel class, and then pass it to the UI.

I know on qt the delegate you can format how each element is beign shown, the list model have this format:

ListModel {
ListElement {
name: "foo"
}
ListElement {
name: "bar"
}

and the list view will iterate and will show all the elements i will send from the backend.

This might seem a bad concept on how models in qt works, but that's what i understood, i just want to know how to program the abstract class and show the data on qt

john_doe

@Denni-0 i would appreciate that, my project consists of replacing a REST API to a QT GUI, before i was using html/js on front-end, now i need to use QT.
Which means i have all the implementations methods recieving and sending json data(json is also a javascript object or a python dictionary that it's easily parsed between), now i need to translate this input/output data into QT.