CODEWITHSUNDEEP
c++qtuser-interfaceinheritanceabstract-class
Trevor Boyd Smith
Trevor Boyd Smith

Reputation: 19273

Do I need to implement my own QAbstractTableModel?

I found this question: How to change the background color for a QTreeView Header (aka QHeaderView)?

I want to be able to set the color for each header section. So the question seen above seems to be my solution!

The solution says "the easiest way to do that is probably to derive a new model from QAbstractItemModel or another model class and reimplement the headerData()". I went and looked at the Qt source tree for QTableWidget, QTableModel, QTableWidgetItem... these classes are supposedly "default models" so I thought they would be a good example and then I would go implement my own QAbstractTableModel.

The 3 files I saw are a whopping 3300 lines of code. That is definitely NOT "the easiest way" IMO!!!

I would like the functionality of QTableWidget but then I want to add the following ability:

Do I really need to inherit/implement QAbstractTableModel if all I want is to change the color of a section header?

Update:

I am not using my own custom view and model classes. I am using the convenience class QTableWidget right now (it is called a convenience class b/c it implements the view and model). The function headerData() is part of the model. The model class, QTableModel, is not accessible via Qt lib/headers so I can't inherit from it.

Update:

I tried creating a new item with background brush QBrush(QColor(Qt::red)) and then setting the table's header with the new item (using QTableWidget::setHorizontalHeaderItem(int column, QTableWidgetItem *item). I also tried inheriting QTableWidgetItem and overriding the virtual data() method with:

QVariant HeaderItem::data(int role) const
{
    if(role==Qt::BackgroundRole) {
        return QVariant(QBrush(QColor(Qt::red)));
    } else if(role==Qt::ForegroundRole) {
        return QVariant(QBrush(QColor(Qt::green)));
    } else {
        return QTableWidgetItem::data(role);
    }
}

I can change the header sections foreground. But when I try to change the header's background brush... nothing happens... it's like the QTableWidgetItem's background brush that I set for the header section is ignored.

Upvotes: 0

Views: 790

Answers (1)

chalup
chalup

Reputation: 8516

Instead of creating model with custom headerData() from scratch create subclass of QTableWidgetItem with desired implementation of QTableWidgetItem::data() and use the instances of this class for QTableWidget::setHorizontalHeaderItem.

Upvotes: 1

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