Can I connect rectangle to C++ model?

Question

I have connected QML's ListView to my C++ model and it updates when model changes which is cool. However I don't want to display my data in ListView bur rather in custom way in rectangle (ideally a plain view which doesn't exist).

How could I do this?

The issue I see obviously is rectangle is not a view and there is other plain view which allows custom drawing. Is there way around it?

Addon

Following up on the answer and comment, let me give context why I am doing it. I have various information and if I use list, I will have to use multiple lists on one screen which doesn't look good. What I want to implement is what I would call 'document view'. Header goes here, title goes there, data here and footer here. It is a custom presentation of my model's data.

@Folibis, I like your first point. It seems like if do something like:

Rectangle 
{
   Text { text: mySingleton.getFruitName() }
   Text { text: mySingleton.getFruitPrice() }
}

Note I have intentionally not included anchors or geometry to keep focus on my question but assume price appears next to fruit name.

Does this mean if I update fruit name or price of the exact same object in model else where in GUI, the above will be updated automatically?

You can use a `Flickable` with a `Repeater` as model if you don't want to use a `ListView` (see [here](http://stackoverflow.com/questions/26669856/howto-flick-a-qml-listview-horizontal-and-vertical/26840056#26840056)). You still have the `delegate` for the model items and the flicking ability without `ListView` features. Howeer the question is: what's the reason to not use `ListView`? — BaCaRoZzo, Jan 21 '15 at 13:30

folibis · Answer 1 · 2015-01-21T11:31:09.310

You have several ways to implement custom drawing. I can't really imagine what data can be supplied to Rectangle but anyway:

You can create custom Item in C++, for example singleton an fetch needed data from it.

Rectangle {
    width: mySingleton.getWidth();
    height: mySingleton.getHeight();
    color: mySingleton.getColor();
}

You can create custom element derived from QQuickPaintedItem. All you need is reimplement QQuickPaintedItem::paint(QPainter * painter) to draw your own rectangle. It's simpliest way to create ow element but not efficient since it uses QPainter.
Create custom element deriver from QQuickItem. You will need to reimplement QSGNode * QQuickItem::updatePaintNode(QSGNode * oldNode, UpdatePaintNodeData * updatePaintNodeData). That's fast and reliable way but requires OpenGL experience.
Also as (1), but painting on Canvas element

Can I connect rectangle to C++ model?

1 Answers1