Qt-jambi-interest Archive, February 2007
Model update in QTreeView ?
Message 1 in thread
Hi,
I'm new to QT and Jambi and trying to understand how the model view works
with trees. In the example below I've created a infinite large tree and
I'm trying to update the first node each second just to understand how to
use signals to notify the view that the data has changed. The problem is
that the dataChanged signal in the model needs two QModelIndex describing
the area of change and the constructor for QModelIndex is private.
How is this supposed to work ?
-=BÃrge
import com.trolltech.qt.gui.QApplication;
import com.trolltech.qt.gui.QTreeModel;
import com.trolltech.qt.gui.QTreeView;
public class JambiFileTree {
private static QTreeView view;
private static MyModel model;
public static void main(String args[]) {
QApplication.initialize(args);
view = new QTreeView();
model = new MyModel();
view.setModel(model);
view.show();
new Thread() {
public void run() {
while (true) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
QApplication.invokeLater(new Runnable() {
public void run() {
model.dataChanged. <---- ?????
}
});
}
}
}.start();
QApplication.exec();
}
}
class MyModel extends QTreeModel {
public Object child(Object object, int i) {
return "Test " + i + "(" + System.currentTimeMillis() + ")";
}
public int childCount(Object object) {
return 10;
}
public String text(Object object) {
return object.toString();
}
}
________________________________________________________________________
BÃrge Nygaard Austvold
Software Engineer, Poseidon Simulation AS
Terminalveien 10,n N-8006 BodÃ, Norway
Mobile : +47 47012347
E-Mail : bna@xxxxxxxxxxx
Internet : www.poseidon.no
Message 2 in thread
BÃrge Austvold wrote:
>
> Hi,
>
> I'm new to QT and Jambi and trying to understand how the model view
> works with trees. In the example below I've created a infinite large
> tree and I'm trying to update the first node each second just to
> understand how to use signals to notify the view that the data has
> changed. The problem is that the dataChanged signal in the model needs
> two QModelIndex describing the area of change and the constructor for
> QModelIndex is private.
The function you're looking for is QAbstractItemModel.createIndex();
http://doc.trolltech.com/qtjambi-1.0/com/trolltech/qt/core/QAbstractItemModel.html#createIndex(int,%20int)
best regards,
Gunnar
