Layouting QQuickItem

Luckless

I have a main qml that defines areas in a layout, where Area1 and Area2 are defined in other qml in the same directory.

Item{
Row{
Area1{}
Area2{}
}}

In another class I have made a qml component, cast it to QQuickItem and returned the QQuickItem* pointer to the main class where I have loaded my main.qml in a QQuickView.
How to add this QQuickItem to Area1 of my main qml.

sierdzio

Add objectName to your Row element, then in C++ search for it using QObject::findChild(), then insert your QQuickItem into the children list of that object.

Note, however, that adding QML components manually from C++ is totally not recommended and unsupported.

Luckless

@sierdzio
Thanks, I will try this.

What would you suggest I must use, if I am making qml components in different C++ libraries and want to merge them in a layout / stacked in a main application where I include these libraries?

How , should I approach component based project development, since my project is really big and dividing it into components / libraries helps manage the project effectively.

sierdzio

you can create your own QML modules
in your libraries you can create QRC resources with your QML files inside them, then load these use Q_INIT_RESOURCE in your main app

Luckless

@sierdzio
I was aware of existence of QML modules and loading resource files. But, I didnt use them because I was doing setContextProperty (to set QAbstractItemModel) to the qml in the library. And if I simply share the resource file it was giving me error " model not defined ". I m not sure if QML modules would be of any help here.

sierdzio

Hm indeed, that complicates things.

You could, perhaps, add an API to your library(ies) that would take a context parameter and add properties there. Something like:

class MyLibrary {
  public:
    registerProperties(QQmlContext *context) {
      if (context) {
        context->setContextProperty(m_model);
      }
    }

};

Pseudo code of course but hopefully you get the idea.

Luckless

@sierdzio said in Layouting QQuickItem:

Add objectName to your Row element, then in C++ search for it using QObject::findChild(), then insert your QQuickItem into the children list of that object.

Note, however, that adding QML components manually from C++ is totally not recommended and unsupported.

I used QObject::findChild() and was able to get the children but was unable to add my QQuickItem to this list of children.
Can I get an example code or a link on how to do this ?

sierdzio

@Luckless said in Layouting QQuickItem:

@sierdzio said in Layouting QQuickItem:

Add objectName to your Row element, then in C++ search for it using QObject::findChild(), then insert your QQuickItem into the children list of that object.

Note, however, that adding QML components manually from C++ is totally not recommended and unsupported.

I used QObject::findChild() and was able to get the children but was unable to add my QQuickItem to this list of children.
Can I get an example code or a link on how to do this ?

Oh, I had something working but can't find the code now :/

It should be enough to call setParent() on your child and give it the object you have found. Then it may be necessary to force the parent to redraw / mark it dirty.

Luckless

@sierdzio
It works now. It was actually a silly mistake coz of which I wasn't getting desired output. Redraw wasnt necessary.
Thanks