QComboBox dynamic list of items

Question

I have two QTableWidgets. Let's call them Tab1 and Tab2. One column of Tab1 contains QComboBoxes where their items are rows from Tab2. When elements of Tab2 are modified (added/removed/edited) I want all QComboBoxes to update.

Tab1 concept

LineNo | Some Text   | Select       |
1      | QString     | QComboBox    |
2      | QString     | QComboBox    |
3      | QString     | QComboBox    |
       |     ...     |     ...      |         
n      | QString     | QComboBox    |

Tab2 concept

LineNo | Some Text   |
1      | QString     |
2      | QString     |
3      | QString     |
       |     ...     |
n      | QString     |

Currently QComboBoxes are filled like this:

QStringList s; // List filled with data from Tab2
QTableWidget *tw = (QTableWidget*) ui->Tabspace->currentWidget()->childAt(10, 10);
QComboBox *names = new QComboBox();
names->addItems(s);
tw->setItem(row, 0, new QTableWidgetItem());
tw->setCellWidget(row, 0, names);

This code is being launched every time I add row to Tab1

Easiest way would be change each QComboBox whenever item content of Tab2 changes. My question is:

Is there a better way to achieve that? Maybe some way to pass pointer to addItems() or modifying just one QComboBox and cloning it?

score 4 · Accepted Answer · answered Mar 27 '14 at 21:59

Use QComboBox::setModel() to share one model with all combo boxes. When changing anything in tab 2, simply modify the model, and the combo boxes will update automatically. For your usecase, it seems like QStringListModel is a good model, although you can of course use more complex ones if needed.

QComboBox dynamic list of items

1 Answers1