Qt QTableView how to have a checkbox only column

Here is a solution. For this to work properly, your column should not have
the

Qt::ItemIsEditable

or

Qt::ItemIsUserCheckable

flags
set. This reads the boolean values from

Qt::DisplayRole

and
calls

setData()

with

Qt::EditRole

(i.e. not

Qt::CheckStateRole

.)

#include "check_box_delegate.h"

#include <QtGui/QApplication>
#include <QtGui/QMouseEvent>

static QRect CheckBoxRect(const QStyleOptionViewItem &view_item_style_options) {
QStyleOptionButton check_box_style_option;
QRect check_box_rect = QApplication::style()->subElementRect(
QStyle::SE_CheckBoxIndicator,
&check_box_style_option);
QPoint check_box_point(view_item_style_options.rect.x() +
view_item_style_options.rect.width() / 2 -
check_box_rect.width() / 2,
view_item_style_options.rect.y() +
view_item_style_options.rect.height() / 2 -
check_box_rect.height() / 2);
return QRect(check_box_point, check_box_rect.size());
}

CheckBoxDelegate::CheckBoxDelegate(QObject *parent)
: QStyledItemDelegate(parent) {
}

void CheckBoxDelegate::paint(QPainter *painter,
const QStyleOptionViewItem &option,
const QModelIndex &index) const {
bool checked = index.model()->data(index, Qt::DisplayRole).toBool();

QStyleOptionButton check_box_style_option;
check_box_style_option.state |= QStyle::State_Enabled;
if (checked) {
check_box_style_option.state |= QStyle::State_On;
} else {
check_box_style_option.state |= QStyle::State_Off;
}
check_box_style_option.rect = CheckBoxRect(option);

QApplication::style()->drawControl(QStyle::CE_CheckBox,
&check_box_style_option,
painter);
}

// This is essentially copied from QStyledItemEditor, except that we
// have to determine our own "hot zone" for the mouse click.
bool CheckBoxDelegate::editorEvent(QEvent *event,
QAbstractItemModel *model,
const QStyleOptionViewItem &option,
const QModelIndex &index) {
if ((event->type() == QEvent::MouseButtonRelease) ||
(event->type() == QEvent::MouseButtonDblClick)) {
QMouseEvent *mouse_event = static_cast<QMouseEvent*>(event);
if (mouse_event->button() != Qt::LeftButton ||
!CheckBoxRect(option).contains(mouse_event->pos())) {
return false;
}
if (event->type() == QEvent::MouseButtonDblClick) {
return true;
}
} else if (event->type() == QEvent::KeyPress) {
if (static_cast<QKeyEvent*>(event)->key() != Qt::Key_Space &&
static_cast<QKeyEvent*>(event)->key() != Qt::Key_Select) {
return false;
}
} else {
return false;
}

bool checked = index.model()->data(index, Qt::DisplayRole).toBool();
return model->setData(index, !checked, Qt::EditRole);
}