QTableWidget - Adding Checkboxes into Cell/ Deleting Line Edit

[Erik_Klein]

Hi Guys,-
Its pretty simple to add a checbox into a table widget, but the problem is once adding, the checkbox seems to live on the cell side by side with a QlineEdit(which i dont need).
I can actually disable the QLineEdit, but im trying to aling the checkboxes to be centered, and it will simply not change its position because it still "sees" the lineedit beside it.

IIs there a way to properly remove the LineEdit from a cell on QTableWidget?

appreciate any help,
thanks!

[jano_alex_es]

Just a question, why do you want to remove the QLineEdit?

[Erik_Klein]

Jano,
thanks for your quick reply.

for 2 reasons:
1. because for that cell in specific, i just need a checkbox and no text input.

2. And i would like the checkbox to nicely align to the center of the cell (right now, because of the invisible lineedit it will simply be stuck on the left side)

[jano_alex_es]

one idea... maybe setting the text as "" could do the trick.

[Erik_Klein]

cheers for that -
but being a complete newbie, let me just risk asking a dumb question: is this do-able within Qt Designer?

(i 'm a graphic designer and mostly using Designer or occasionaly QtCreator)

thanks,

[jano_alex_es]

I don't know if there are any other ways, but you can subclass QTableWidgetItem and create your own Items; for instance, one with the checkbox and no text at all.

But, in my opinion, if you can "cheat" a little bit (like setting and empty string) and solve your problems that way.. better :P So far I didn't need to subclass QTableWidgetItem.

[b_ginner]

Hi there, I'm a beginner...
I'm searching for how to add a button into a table, in a cell, then I found your post....
Could you tell me how you add a checkbox as a QTableWidgetItem ??

Thanks....

[b_ginner]

Hi there, I'm a beginner...
I'm searching for how to add a button into a table, in a cell, then I found your post....
Could you tell me how you add a checkbox as a QTableWidgetItem ??

Thanks....

Nevermind, found that already

[gb16]

Hi Erik,

I don't know if it is the best solution, but I've found a solution!
I have subclassed QItemDelegate and only overwrite the paint()-method.
The implementation of the paint()-method I've "borrowed" from QItemDelegate::paint().

I only commented out a few lines which refer to QItemDelegatePrivate-class and added a rectangle movement to center the checkbox.

class CheckBoxDelegate : public QItemDelegate
{
Q_OBJECT

public:
CheckBoxDelegate( QObject* pParent = 0 ) : QItemDelegate( pParent ) {}
virtual ~CheckBoxDelegate() {}

void paint( QPainter *painter,
const QStyleOptionViewItem &option,
const QModelIndex &index ) const;
};

void CheckBoxDelegate::paint(QPainter *painter,
const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
//Q_D(const QItemDelegate);
Q_ASSERT(index.isValid());

QStyleOptionViewItemV4 opt = setOptions(index, option);

const QStyleOptionViewItemV2 *v2 = qstyleoption_cast<const QStyleOptionViewItemV2 * >(&option);
opt.features = v2 ? v2->features
: QStyleOptionViewItemV2::ViewItemFeatures(QStyleOpt ionViewItemV2::None);
const QStyleOptionViewItemV3 *v3 = qstyleoption_cast<const QStyleOptionViewItemV3 * >(&option);
opt.locale = v3 ? v3->locale : QLocale();
opt.widget = v3 ? v3->widget : 0;

// prepare
painter->save();
if( hasClipping() )
{
painter->setClipRect( opt.rect );
}

// get the data and the rectangles

QVariant value;

QPixmap pixmap;
QRect decorationRect;
// IN THIS SPECIAL CASE: no decoration (icon) required -> commented dispayRect calculation
//value = index.data(Qt::DecorationRole);
//if (value.isValid()) {
// // ### we need the pixmap to call the virtual function
// pixmap = decoration(opt, value);
// if (value.type() == QVariant::Icon) {
// d->tmp.icon = qvariant_cast<QIcon>(value);
// d->tmp.mode = d->iconMode(option.state);
// d->tmp.state = d->iconState(option.state);
// const QSize size = d->tmp.icon.actualSize(option.decorationSize,
// d->tmp.mode, d->tmp.state);
// decorationRect = QRect(QPoint(0, 0), size);
// } else {
// d->tmp.icon = QIcon();
// decorationRect = QRect(QPoint(0, 0), pixmap.size());
// }
//} else {
// d->tmp.icon = QIcon();
// decorationRect = QRect();
//}

QString text;
QRect displayRect;
// IN THIS SPECIAL CASE: no text required -> commented dispayRect calculation
//value = index.data(Qt::DisplayRole);
//if (value.isValid() && !value.isNull()) {
// text = QItemDelegatePrivate::valueToText(value, opt);
// displayRect = textRectangle(painter, textLayoutBounds(opt), opt.font, text);
//}

QRect checkRect;
Qt::CheckState checkState = Qt::Unchecked;
value = index.data(Qt::CheckStateRole);
if (value.isValid()) {
checkState = static_cast<Qt::CheckState>(value.toInt());
checkRect = check(opt, opt.rect, value);
}

// do the layout

doLayout(opt, &checkRect, &decorationRect, &displayRect, false);

// move checkBox to the center of the column
checkRect.moveRight( ( opt.rect.width() + checkRect.width() ) / 2.0 );

// draw the item

drawBackground(painter, opt, index);
drawCheck(painter, opt, checkRect, checkState);

// no decoration, no text and no focus -> no need to draw!!!
//drawDecoration(painter, opt, decorationRect, pixmap);
//drawDisplay(painter, opt, displayRect, text);
//drawFocus(painter, opt, displayRect);

// done
painter->restore();
}

To set CheckBoxDelegate() for the first column of the tableWidget,
you only need to add the following line:

tableWidget->setDelegateItemForColumn( 0, new CheckBoxDelegate() );

Good luck!