void MyWindow::initializeModelBySQL(QSqlQueryModel *model,QTableView *table,QString sql){
model = new QSqlQueryModel(this);
model->setQuery(sql);
}
With this method i can set a QSQlQueryModels to my QTableviews.
But How i can set color to a row based on a cell value?
The view draws the background based on the Qt::BackgroundRole
role of the cell which is the QBrush
value returned by QAbstractItemModel::data(index, role)
for that role.
You can subclass the QSqlQueryModel
to redefine data()
to return your calculated color, or if you have Qt > 4.8, you can use a QIdentityProxyModel
:
class MyModel : public QIdentityProxyModel
{
QColor calculateColorForRow(int row) const {
...
}
QVariant data(const QModelIndex &index, int role)
{
if (role == Qt::BackgroundRole) {
int row = index.row();
QColor color = calculateColorForRow(row);
return QBrush(color);
}
return QIdentityProxyModel::data(index, role);
}
};
And use that model in the view, with the sql model set as source with QIdentityProxyModel::setSourceModel
.
You can keep the model unchanged and modify the background with a delegate set on the view with QAbstractItemView::setItemDelegate
:
class BackgroundColorDelegate : public QStyledItemDelegate {
public:
BackgroundColorDelegate(QObject *parent = 0)
: QStyledItemDelegate(parent)
{
}
QColor calculateColorForRow(int row) const;
void initStyleOption(QStyleOptionViewItem *option,
const QModelIndex &index) const
{
QStyledItemDelegate::initStyleOption(option, index);
QStyleOptionViewItemV4 *optionV4 =
qstyleoption_cast<QStyleOptionViewItemV4*>(option);
optionV4->backgroundBrush = QBrush(calculateColorForRow(index.row()));
}
};
As the last method is not always obvious to translate from C++ code, here is the equivalent in python:
def initStyleOption(self, option, index):
super(BackgroundColorDelegate,self).initStyleOption(option, index)
option.backgroundBrush = calculateColorForRow(index.row())