how to populate and control the one qcombo box elements from another qcombo box

veera

Hi All,
I have two qcombo boxes are there if i have choose one parameter from first qcombo box associated with that parameters only need to display how to do it ...?

mrjj

Hi
Your sentence is a bit broken ;)
You mean ?
You have 2 combos
Combo 1 display
aaa
bbb
cccc
Combo 2 display
nothing yet.

You click on aaa
now Combo 2 display
Related to aaa

Kind of way ?

VRonin

Your question is very unclear. try giving us an example of what you want to do.

Spoiler Alert:
99.9999999% chance the answer is "use the same model for the 2 combo boxes"

veera

first qcombox having ticket_printer,bill_acceptor
second qcombox having slot_admin,smartcard,tckt_in,tckt_out,bill_acceptor_in,bill_acceptor_out

if i choose bill_acceptor in first qcombo box ,in second qcombo box need to show bill_acceptor_in,bill_acceptor_out only not all in second qcombo box .....

veera

Hi All,
Now you got it or shall i send the screen shot of the gui ?

VRonin

QAbstarctItemModel* model = new QStandardItemModel(this);
model->insertColumn(0);
model->insertRows(0,2);
auto rootIdx = model->index(0,0);
model->setData(rootIdx,"ticket_printer");
model->insertColumn(0,rootIdx);
model->insertRows(0,4,rootIdx);
model->setData(model->index(0,0,rootIdx),"slot_admin");
model->setData(model->index(1,0,rootIdx),"smartcard");
model->setData(model->index(2,0,rootIdx),"tckt_in");
model->setData(model->index(3,0,rootIdx),"tckt_out");
rootIdx = model->index(1,0);
model->setData(rootIdx,"bill_acceptor");
model->insertColumn(0,rootIdx);
model->insertRows(0,2,rootIdx);
model->setData(model->index(0,0,rootIdx),"bill_acceptor_in");
model->setData(model->index(1,0,rootIdx),"bill_acceptor_out");
combo1->setModel(model);
combo2->setModel(model);
connect(combo1, QOverload<int>::of(&QComboBox::currentIndexChanged),[=](int idx){combo2->setRootModelIndex(model->index(idx,0)); });

veera

@VRonin said in how to populate and control the one qcombo box elements from another qcombo box:

QAbstarctItemModel* model = new QStandardItemModel(this);

@VRonin ,
Thanks a lot ,i have already dialog gui window everything i put into the qcombo boxes.here in this above code you are manually creating it ?

VRonin

Yes, Qt Designer doesn't allow to do this so you have to do it manually in the code.

That thing goes just after ui->setupUi(this);

Taz742

This post is deleted!

veera

@VRonin
okay fine ... i will try this

VRonin

An alternative, suggested by @mrjj is to use a QSortFilterProxy model on the second combo to filter out options you don't want to see