ListView won't get updated when I change data in my custom model

[Christian Ehrlicher]

Are you sure you're calling dataChanged() with the correct values?

[VRonin]

can you show us your code?

[ivarec]

@Christian-Ehrlicher I pass two QModelIndex objects, one initiated to the top left row and column of my change and one initiated to its bottom right. Via debugger, I can see that the values make sense. For example:

My model has 4 columns (fixed, doesn't change). If I append a new row and my model previously had 2 rows, What I see is:

topLeft -> 2, 0
bottomRight -> 2, 3

[ivarec]

@VRonin I will setup a minimal test case

[Christian Ehrlicher]

And is the parent correct?

[ivarec]

@Christian-Ehrlicher my model is created once upon startup in main.cpp. I create it with my QGuiApplication as the parent. My ListView is also a child of this QGuiApplication. Is this the wrong way to do it?

[Christian Ehrlicher]

The QModelndex you're passing to dataChanged() need a proper parent index: http://doc.qt.io/qt-5/model-view-programming.html#parents-of-items

[VRonin]

@ivarec said in ListView won't get updated when I change data in my custom model:

My ListView is also a child of this QGuiApplication.

This is unrelated but probably bad

[ivarec]

@VRonin Maybe I've expressed myself badly, since I'm still a newbie in Qt. The ListView is created via QML. It's as basic as:

ListView {
  id: list
  model: myModel
}

Maybe, when done like that, the parent of the ListView is not the application itself, which must be why you were surprised.

[Christian Ehrlicher]

Can we finally see where and how you emit dataChanged()? And with which indexes?