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June 21, 2011

Mr.G

Lab Rat
44 posts

QAbstractItemDelegate::paint() : custom Delegate, how to alter the value displayed in cell - Solved

hello all,
there is probably an easy way to do this: the thing is that in the DB the values of a ‘mytype’ column are from 1 to 5. these
values represent constants in the program, so, here is what I have:

void MyTypeDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
const QModelIndex &index) const {
int value = index.model()->data(index, Qt::DisplayRole).toInt();
switch(value){
case MyTypes::Type_A:
//change displayed value to "type A"
break;
//.... and so on
};
}

is there a way to do this?
thx,
G

3 replies

June 21, 2011

Volker

Robot Herder
5428 posts

I think it would be better to put an QAbstractProxyModel subclass inbetween (or maybe a QSortFilterProxyModel subclass, you’ll have to check which one fits best).

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June 21, 2011

Andre

Area 51 Engineer
6031 posts

For Qt 4.7, use a QSortFilterProxyModel as your base, for 4.8, a QIdentityProxyModel. You don’t want to implement the item mapping yourself, I think.

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June 21, 2011

Mr.G

Lab Rat
44 posts

well, I solved it by using the painter:

void MyTypeDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
const QModelIndex &index) const {
int value = index.model()->data(index, Qt::DisplayRole).toInt();
QString text;
switch(value){
case MyTypes::Type_A:
text = "type A";
break;
//.... and so on
};
QRect r = option.rect.adjusted(2, 2, -2, -2);
painter->drawText(r.left(), r.top(), r.width(), r.height(), Qt::AlignVCenter|Qt::AlignLeft|Qt::TextWordWrap, text, &r);

it is a quick and dirty solution but will do for the time table I have for this, a proxy model might be a better solution, but, the delegate also handles the editing part of the cell, so, it’s a good ‘all in one’ solution

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June 21, 2011

QAbstractItemDelegate::paint() : custom Delegate, how to alter the value displayed in cell - Solved

June 21, 2011

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