Manuel wrote:
> Hi Gunnar,
>
> thanks for your reply.
> I got it working with beginInsertRows() and endInsertRows() but i think,
> that i don't implemented it correctly :-)
> Is there any example available?
>
> Here is what i have done. Please correct me, if my way of thinking is
> wrong:
>
> I have an Array, ArrayList or whatever i want to show in the table. For
> example a list of File-Objects.
> I want to list these files in the table (filename, file size etc.). So
> my TableModel has to know the ArrayList.
> I transfer this ArrayList to the TableModel via a parameter in the
> contructor.
> Is this the best way to give the TableModel access to the ArrayList?
>
> Now my program manipulates the ArrayList in the background. For example
> i add or delete files.
> Should i now call the beginInsertRows() and endInsertRows()-functions
> manually to get the GUI to be updated?
> Or is there a possibility, that the TableModel recognizes itself, that
> the ArrayList has changed.
> Actually i fire an event when the ArrayList changes and call an
> update-Function which call the beginInsertRows() and endInsertRows()
> functions.
Calling begin/end after the change is not enough. You need to do
beginInsertRows()
change array
endInsertRows()
with the proper arguments for the new rows to be committed correctly.
Below you'll find a modified version of your code where I have a
doStuff() funtion that is called after 3 seconds which adds another row
to the program.
best regards,
Gunnar
package mcut.gui;
import java.util.*;
import com.trolltech.qt.gui.*;
import com.trolltech.qt.core.*;
public class TableModelMyFile extends QAbstractTableModel {
ArrayList<String> myFiles;
public TableModelMyFile(ArrayList<String> myFiles) {
this.myFiles = myFiles;
}
public int columnCount(QModelIndex i) { return 5; }
public int rowCount(QModelIndex i) { return myFiles.size(); }
public Object data(final QModelIndex index, int role) {
switch (role) {
case Qt.ItemDataRole.DisplayRole:
return myFiles.get(index.row()) + ":" + index.column();
default:
break;
}
return null;
}
public void doStuff() {
beginInsertRows(null, 3, 3);
myFiles.add("Four");
endInsertRows();
}
public static void main(String args[]) {
QApplication.initialize(args);
QTableView view = new QTableView();
ArrayList<String> list = new ArrayList<String>();
list.add("One");
list.add("Two");
list.add("Three");
final TableModelMyFile model = new TableModelMyFile(list);
view.setModel(model);
view.show();
QApplication.invokeLater(3000, new Runnable() {
public void run() {
model.doStuff();
}
});
QApplication.exec();
}
}
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