How to get the selectionchange event in Qt
I have a class inherited from QWidget, now in that class I will be creating aQListView object and filling up the items to view. When the selection of items in the list view gets changed, I want to get the selectionChange event.
How can I achieve this?. Please tell me in brief.
When you have a view, you will have a model that will be used to select item. It's called a QItemSelectionModel.
For example, with your QListView, you can get the selectionModel this way :
QItemSelectionModel* selectionModel() const;
Now, from that model, you'll be able to connect on many signals :
void currentChanged ( const QModelIndex & current, const QModelIndex & previous ) void currentColumnChanged ( const QModelIndex & current, const QModelIndex & previous ) void currentRowChanged ( const QModelIndex & current, const QModelIndex & previous ) void selectionChanged ( const QItemSelection & selected, const QItemSelection & deselected )
I think it will help you a bit!
https://doc.qt.io/archives/qt-4.8/qlistwidget.html You might want to use QListWidget instead of view, I don't remember specifics why, but this class has these signals you want to use.
https://doc.qt.io/archives/qt-4.8/qlistwidget.html#itemSelectionChanged This is the signal you have to connect to.
Make a slot in your class declaration:
private slots: void selChanged();
Fill this slot with what you want to do upon selection change. Connect the signal to this slot somewhere in your class - perhaps in the constructor of your QWidget derivative.
connect(yourListWidget, SIGNAL(itemSelectionChanged()), this, SLOT(selChanged()));