How do I disable one tab in a QTabWidget?

Question

I have a QTabWidget called tabWidget. It has three tabs: "Basic", "Advanced", and "Current Structure". The tabs are displayed in the widget in that order.

I want to disable the "Advanced" tab whenever the Boolean result is false. I thought it would be as simple as this code:

bool result = false;
if (result == false)
{
  tabWidget->widget(1)->setDisabled(true);
}

Unfortunately, this code does not disable the tab, it remains enabled even when I check it:

tabWidget->tabBar()->isTabEnabled(1);  // This returns true

Why doesn't the tab become disabled? Is there another way to do it?

I am using Qt 5.4.0.

Thorne

Answer 1

You can enable/disable individual tabs in a QTabWidget using the member function setTabEnabled(int index, bool enable).

Based on your code snippet, it would look like this:

bool result = false;
if (result == false)
{
  tabWidget->setTabEnabled(1, false);
}

Mustard

Or more succinctly: tabWidget->setTabEnabled(1, result); – Butter

Answer 2

You can't, not this way.

You have to iterate through all the children in the Page and disable them.

Something like this:

QList<QWidget*> list = parentWidget->findChildren<QWidget*>() ;
foreach( QWidget* w, list ) {
   w->setEnabled( false ) ;
}

Terefah

This is what I needed. It prevents change of tab contents, but retains visibility of the tab. – Injustice

Answer 3

If you use Qt Widgets Application template and Advanced tab's name is tabAdvanced (you can check the name in Object Inspector), this should work:

ui->tabAdvanced->setEnabled(false);

Workroom

what is tabAdvanced? – Hisakohisbe

should be the name of Advanced tab QWidget, which is the child of tabWidget, you can check the name in Object Inspector – Workroom

The questioner only wants to disable a QTabBar tab, not the QTabWidget, so your code does not respond to the OP. – Hisakohisbe

It's not QTabWidget, it's QWidget. The questioner accepted Daniel Hedberg's answer which seems to disable tabWidget's page, my code does the same but in different way. – Workroom

If you realize your question does not work since you are assuming many things, it is not general, I recommend you read How to Answer, if you improve your answer I will remove the downvote. – Hisakohisbe

Ok I've edited my answer (not a question) but still I don't understand you claim, I've started my answer from saying that my code is not the general case – Workroom

Do you think it is practical and elegant to use the name of the widget? A better option would be to use the index of the tab. – Hisakohisbe

In this exact case when we don't need to iterate tabs, yes I think using name makes the code more readable. – Workroom

Answer 4

You could disable the layout of the tab.

bool result = false;
if (result == false)
{
  tabWidget->widget(1)->layout()->setDisabled(true);
}

Kristakristal