Synchronize QTableWidget cell with widget in the center of the cell - qt

Question

I use QCheckBox in QTableWidgetCell
QWidget *widget = new QWidget();
QCheckBox *checkBox = new QCheckBox();
QHBoxLayout *layout = new QHBoxLayout(widget);
layout->addWidget(checkBox);
layout->setAlignment(Qt::AlignCenter);
layout->setContentsMargins(0, 0, 0, 0);
widget->setLayout(layout);
table->setCellWidget(0, 0, widget);
The result of this code is a cell with checkbox in the center.
I need to make checkbox reaction to mouse moving and clicking in the empty area like when cursor is under checkbox.

Answer 1

If you dont want the fullblown functionality of QCheckBox but just the checkmark, You can use a simple QTableWidgetItem and modify his checkstate.
QTableWidgetItem* item = new QTableWidgetItem();
item->setCheckState(Qt::Unchecked);
table->setItem ( 0, 0, item );
connect(table, SIGNAL(cellClicked(int , int )), this, SLOT(OnClicked( int, int)));
void OnClicked( int row, int column )
{
if(row != checkablelerow && col != checkablelecol )
return; // or do something else
item = table->item(row, column);
item->setCheckState(item->checkState() == Qt::Checked ? Qt::Unchecked : Qt::Checked);
}
Now the whole cell will be checkable. Code may need refinement.

Answer 2

You can override eventFilter method to highlight your checkbox when cursor enters the cell. http://qt-project.org/doc/qt-4.8/qobject.html#eventFilter
bool ExampleDialog::eventFilter(QObject *obj, QEvent *event)
{
if (qobject_cast<QTableWidgetItem*>(object)) {
if (event->type() == QEvent::HoverEnter) {
QCheckBox* qcb = object->findChild<QCheckBox*>();
//here you can do something to highlight your checkbox
return true;
}
else if(event->type() == QEvent::HoverLeave){
QCheckBox* qcb = object->findChild<QCheckBox*>();
//here you have to stop highlighting checkbox
return true;
}
else {
return false;
}
}
}
After overriding, you have to install event filter on your widgets like this
widget->installEventFilter(this); //this points to parent of the widget, the exampleDialog
And use a clicked slot of QTableWidgetItem* to set your checkbox checked.
void QTableWidgetItemClicked( int row, int column )
{
QCheckBox* qcb = QObject::sender()->findChild<QCheckBox*>();
qcb->setChecked(!qcb->isChecked());
}
Remember to connect QTableWidgetItems signals to slots.