Make 2 QCombobox dependent

[Mike_newbye]

Hi,

I have 2 combo boxes, and I want to enable/disable current indexes dependent on the index of the other one. The disable part goes well. But I cannot figure out how to enable the index back when it is in acceptable.

@void MainWindow::on_vert_axis_dropbox_currentIndexChanged()
{
int v = ui->vert_axis_dropbox->currentIndex();
ui->hor_axis_dropbox->setItemData(v, 0, Qt::UserRole -1);
y = v;
ui->hor_axis_dropbox->setItemData(y, 1, Qt::UserRole -1);
}

void MainWindow::on_hor_axis_dropbox_currentIndexChanged()
{
int h = ui->hor_axis_dropbox->currentIndex();
ui->vert_axis_dropbox->setItemData(h, 0, Qt::UserRole -1);
x = h;
ui->vert_axis_dropbox->setItemData(x, 1, Qt::UserRole -1);
}@

This part automatically disables the index if it is equal to the index of the other combo box.
@ui->vert_axis_dropbox->setItemData(h, 0, Qt::UserRole -1);@
@ui->hor_axis_dropbox->setItemData(v, 0, Qt::UserRole -1);@

I guess this part should reactivate that index if it is changed, and is not equal to the index of the other one.
@ui->hor_axis_dropbox->setItemData(y, 1, Qt::UserRole -1);@
@ui->vert_axis_dropbox->setItemData(x, 1, Qt::UserRole -1);@

But actually it is not enabled.

Thanks in advance.

[SGaist]

Hi,

This is not the way to do it, you should rather do something like:
@
QStandardItemModel *model = qobject_cast<QStandardItemModel *>(combobox->model());
QStandardItem *item = model->item(itemIndex);
item->setEnabled(enableCondition);
@

Hope it helps

[Mike_newbye]

Hi,

Thanks for the answer.

I made privates in .h file:

@ QStandardItemModel *model_h;
QStandardItem *item_h;
QStandardItemModel *model_v;
QStandardItem *item_v;@

then applied them in standard constructor:

@model_h = qobject_cast<QStandardItemModel *>(ui->hor_axis_dropbox->model());
item_h = model_h->item(ui->hor_axis_dropbox->currentIndex());

model_v = qobject_cast<QStandardItemModel *>(ui->vert_axis_dropbox->model());
item_v = model_v->item(ui->vert_axis_dropbox->currentIndex());@

After it when wanting to enable back the current index i did:

@void MainWindow::on_hor_axis_dropbox_currentIndexChanged()
{
...
item_h->setEnabled(h!=ui->vert_axis_dropbox->currentIndex());
}

void MainWindow::on_vert_axis_dropbox_currentIndexChanged()
{
...
item_v->setEnabled(v!=ui->hor_axis_dropbox->currentIndex());
}@

But the application didn't even start
bq. The program has unexpectedly finished.
C:\Qt\latest test\build-Prototype-Desktop_Qt_5_1_0_MinGW_32bit-Debug\debug\Prototype.exe exited with code -1073741819

Could you please help me to solve it? I am new in it.

Thanks.

[SGaist]

Run it through a debugger, It'll show you where it fails. Probably some pointer problem