No icon with QStyleOptionButton

[Garrappachc]

I have got a weird problem.

I need to have some buttons in my QTableView. I used to use QAbstractItemView::setIndexWidget() method, but it is not very responsible when working with larger models. Therefore I decided to switch to QStyledItemDelegate. My buttons have icons (and icons only, no text). When working with setIndexWidget, I used the following code:

ClientDetailsButton::ClientDetailsButton(const Client* _client,
                                         QWidget* _parent) :
    QPushButton("", _parent),
    __current(_client) {
 
  setIcon(QIcon(":/uiIcons/button-details.png"));
}

ClientDetailsButton::ClientDetailsButton(const Client* _client,
                                         QWidget* _parent) :
    QPushButton("", _parent),
    __current(_client) {

  setIcon(QIcon(":/uiIcons/button-details.png"));
}

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And it worked perfectly. But when I switch to delegate, I use it like that:

QStyleOptionButton button;
button.rect = _option.rect;
button.text.clear();
button.icon = QIcon(":/uiIcons/button-details.png");
button.state = _option.state | QStyle::State_Enabled;
 
if (_index == __button)
  button.state |= QStyle::State_Sunken;
 
QApplication::style()->drawControl(QStyle::CE_PushButton, &button, _painter);

QStyleOptionButton button;
button.rect = _option.rect;
button.text.clear();
button.icon = QIcon(":/uiIcons/button-details.png");
button.state = _option.state | QStyle::State_Enabled;

if (_index == __button)
  button.state |= QStyle::State_Sunken;

QApplication::style()->drawControl(QStyle::CE_PushButton, &button, _painter);

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The button itself is fine, but its empty. There is no icon visible. Suprisingly, when I use, for example:

button.icon = QIcon::fromTheme("dialog-information", QIcon(":/uiIcons/button-details.png"));

button.icon = QIcon::fromTheme("dialog-information", QIcon(":/uiIcons/button-details.png"));

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the theme icon is visible. But if Qt cannot find the theme icon, the replacement is still blank. I tried everything I could think of and have no idea why it doesn't work. Anyone has any ideas?