Show push button with "pressed" state in QTableView - qt

Question

I have created a delegate to show push buttons in a QTableView. It looks like this (last two columns):
Here's the code for the delegate's paint method:
void PushButtonDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
QStyleOptionButton buttonOption;
buttonOption.state = QStyle::State_Enabled;
buttonOption.text = this->text;
buttonOption.rect = option.rect.adjusted(1, 1, -1, -1);
QApplication::style()->drawControl(QStyle::CE_PushButton, &buttonOption, painter);
}
I'm using the table view's clicked signal to capture the clicks on the buttons and that works fine. How can I tweak the delegate so that the buttons look pressed when clicking on them?

Answer 1

Looks like flag QStyle::State_Sunken makes button visually pressed. So try
buttonOption.state = QStyle::State_Enabled | QStyle::State_Sunken;
EDIT:
You can implement button clicking painted by delegate with changing data of QTableWidgetItem (if it was created before). For example, let's use Qt::CheckStateRole for passing a pressed state (or use any other role like Qt:UserRole + 1). In this case your paint method will be
void WidgetPixmapDelegate::paint(QPainter *painter,
const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
QStyleOptionButton buttonOption;
bool isPressed = index.data(Qt::CheckStateRole).toBool();
if (isPressed)
{
buttonOption.state = QStyle::State_Enabled | QStyle::State_Sunken;
}
else
{
buttonOption.state = QStyle::State_Enabled;
}
buttonOption.text = "Text";
buttonOption.rect = option.rect.adjusted(1, 1, -1, -1);
QApplication::style()->drawControl(QStyle::CE_PushButton, &buttonOption, painter);
}
So when you will set Qt::CheckStateRole data button will be painted as pressed.
For processing mouse event subclass QTableWidget and reimplement mouse events you need.
class ClickTableWidget : public QTableWidget
{
Q_OBJECT
public:
explicit ClickTableWidget(QWidget *parent = 0);
protected:
void mousePressEvent(QMouseEvent *event);
void mouseReleaseEvent(QMouseEvent *event);
signals:
public slots:
};
void ClickTableWidget::mousePressEvent(QMouseEvent *event)
{
QTableWidgetItem *item = itemAt(event->pos());
if (item)
{
//check column item->column()
item->setData(Qt::CheckStateRole, true);
}
}
void ClickTableWidget::mouseReleaseEvent(QMouseEvent *event)
{
QTableWidgetItem *item = itemAt(event->pos());
if (item)
{
item->setData(Qt::CheckStateRole, false);
}
}
Of course this is a primitive example and it does not check drag behaviour, mouse buttons and does not implement hover animation.