QML: Canvas like a view

Question

I have a set of rectangles provided by c++ backend, and I'd like to paint each of them on qml side with some extra decorations, colors opacity etc (respecting rectangles' positions and sizes).

I was hoping for some special kind of view which would accept a model containing all these rectangles and then would use them in delegates to define items' positions and sizes.

The best I was able to find is 'Canvas' which I may use to fulfill my needs, but maybe there is something more suitable?

Does a `Repeater` do what you want? – JarMan Jan 01 '21 at 20:36 — JarMan, Jan 01 '21 at 20:36
@JarMan indeed it does. What a surprise for me:) – Michał Walenciak Jan 01 '21 at 22:01 — Michał Walenciak, Jan 01 '21 at 22:01
Great, then I'll add it as an answer. – JarMan Jan 01 '21 at 23:59 — JarMan, Jan 01 '21 at 23:59

score 2 · Answer 1 · answered Jan 01 '21 at 21:35

2

You can try using listview delegate.

May be you can use QObjectList-based Model, as said in below link

https://doc.qt.io/qt-5/qtquick-modelviewsdata-cppmodels.html

In your c++ code expose the required data from rectangles using Q_PROPERTY

answered Jan 01 '21 at 21:35

Pavan Chandaka

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I tried @JarMan 's solution which is quite simple and does what I need so I'll go for it. – Michał Walenciak Jan 01 '21 at 22:06

score 2 · Accepted Answer · answered Jan 02 '21 at 00:02

A Repeater can accept a model and instantiate your Rectangles at any size/position.

Repeater {
    model: rectangleModel    // Comes from C++

    delegate: Rectangle {
        x: model.x
        y: model.y
        width: model.width
        height: model.height
    }
}

QML: Canvas like a view

2 Answers2