可编辑的QComboBox：将编辑文本与项目文本同步

Question

I've got a QComboBox which I want to be "automatically" editable. That is, every time a user manually changes current item's text, that text should "fall" to the underlying model automatically.

So far, I've reached this via a custom signal handler:

void setupUi() {
    ...
    connect( someComboBox,
             SIGNAL(editTextChanged(QString)),
             SLOT(comboBoxEditTextChanged(QString)) );
    ...
}

void comboBoxEditTextChanged( const QString& text ) {
    someComboBox->setItemText( someComboBox->currentIndex(), text );
}

So I wonder, is there a possibility to do this with less code? I've tried QComboBox::setInsertPolicy(QComboBox::InsertAtCurrent) , but that didn't help.

EDIT: Current method with a custom slot works properly - but I'm asking if there's a method that does not involve any signals/slots.

Answer 1

To set the Text Automatically when USER changes it, we can edit your slot as follows:

void comboBoxEditTextChanged( const QString& text ) 
{
    int index = someComboBox->findText(text);
    if(index != -1)
    {
      someComboBox->setCurrentIndex(index);
     }
    someComboBox->setItemText( someComboBox->currentIndex(), text );
}

I hope this will resolve your issue

Answer 2

QComboBox can add items manually using

combo->additem("X"); 

combo->addItem(QString Y);

whereas you can manage the maximum number of items in it. Please go through the following link for details.

a link

So, in your slot,

void comboBoxEditTextChanged( const QString& text ) 
{
    someComboBox->addItem(text);
}