我可以将矩形连接到C ++模型吗？

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?

Answer 1

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

1. 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();
}

2. 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 .

3. 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.

4. Also as (1), but painting on Canvas element