@JonB Thank you for your explanation. I understand what i need to do, but i need a little help in making the right signals and slots. My project was setup using the "Using C++ Models in QML {tutorial}" as a guide. here the ToDoList class is set as the data in ToDoListModel class.
In the ToDoList Calss there are:
1.appendItem() function, which emits the signals preItemAppended() and postItemAppended()
2.removeItem() funciton, which emits the signals preItemRemoved() and postItemRemoved()
[these work fine]
3.similar to the appendItem() and removeItem() I am trying to make a setItemAt() function that will modify the existing data. but there was no steps in the tutorial to indicate how i could notify the model to emit the dataChanged() signal. I tried making my own signal in the data class and a slot in model class but i couldn't figure out how to connect them. the main function has a ToDoList object but no ToDoListModel object (ToDoListModel is just registered to qml). i am only familiar with using the connect(*sender,signal,*receiver, slot) function to connect.
I suspect that it has something to do with the
'Q_PROPERTY(ToDoList *list READ list WRITE setList NOTIFY listChanged)'
line in the ToDoListModel header file. following the tutorial I removed the NOTIFY listChanged part.
summary:which signal do i need to emit from the data class(ToDoList) to have the model class (ToDoListModel) emit the dataChanged() signal?
