Making Table cell as a combobox?

[kaushal_gaurav]

Hi,

I was facing an issue in designing one screen where in I need to display a table and each table cell is a combo and the values in them need to be populated from a Modal view.
Approach that I had followed is … Creating a QTableView widget and displaying values from a Modal.
But I am struck – ‘how to make each cell of table as a comb box and the populate each combo with a values from Modal’?

help me out.

[Ginsengelf]

Hi,
you need to use a custom delegate. In its createEditor()-method, return a new QCombobox.
Possibly you will need persistend editors in your table, otherwise the combobox will only show up if the users edits the cell.

Ginsengelf

[kaushal_gaurav]

i have written my custom delegate but it just works wwith QTableWidget and not with
QTableView. I need to use QTableView because i want to show data from my Modal.

[Ginsengelf]

That's weird since QTableWidget inherits QTableView...
Could you show some code?

[kaushal_gaurav]

That is ok. Got the combobox in table cell using delegate.

But there is a problem when i use my custom model. My custom model is derived from
QAbstract item Model...
When i use this model then only the data is displayed but no combo box is there...
but when i use QStandardItemModel there is combobox as well as data.

help!

[jpn]

How did you implement flags() and data()? Did you return Qt::ItemIsEditable together with other flags in former and did you handle Qt::EditRole in latter?

[kaushal_gaurav]

I have implemented data as

QVariant className::data(const QModelIndex & index, int role) const
{
	if( index.isValid() == false )
		return QVariant();
 
	if( role == Qt::EditRole )
	{
		if( index.internalPointer() )
		{
			int parentRow = ipToRow(index.internalPointer());
			return QString("Cell %3.%1.%2").arg(index.row()).arg(index.column())
				.arg(parentRow);
		}
 
		return QString("Cell %1.%2").arg(index.row()).arg(index.column());
	}

QVariant className::data(const QModelIndex & index, int role) const
{
	if( index.isValid() == false )
		return QVariant();

	if( role == Qt::EditRole )
	{
		if( index.internalPointer() )
		{
			int parentRow = ipToRow(index.internalPointer());
			return QString("Cell %3.%1.%2").arg(index.row()).arg(index.column())
				.arg(parentRow);
		}

		return QString("Cell %1.%2").arg(index.row()).arg(index.column());
	}

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and Flags() as

Qt::ItemFlags className::flags( const QModelIndex& idx ) const
{
 
	return Qt::ItemIsEditable;
}

Qt::ItemFlags className::flags( const QModelIndex& idx ) const
{

	return Qt::ItemIsEditable;
}

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but it did not work.

did i do something wrong...?

[jpn]

Qt::ItemFlags className::flags( const QModelIndex& idx ) const
{
 
	return Qt::ItemIsEditable;
}

Qt::ItemFlags className::flags( const QModelIndex& idx ) const
{

	return Qt::ItemIsEditable;
}

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This would mean that all items are disabled, thus non-editable. Try something like:

Qt::ItemFlags className::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return 0;
 
    return Qt::ItemIsSelectable|Qt::ItemIsEnabled|Qt::ItemIsEditable;
}

Qt::ItemFlags className::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return 0;

    return Qt::ItemIsSelectable|Qt::ItemIsEnabled|Qt::ItemIsEditable;
}

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[kaushal_gaurav]

yipeee....it works...
thanks buddy..

but how can make it persistent....i have to click the table cell to make it show.

[Ginsengelf]

Hi,
use QAbstractItemView::openPersistentEditor.

Ginsengelf