CODEWITHSUNDEEP
pythonqtpyqt
dman
dman

Reputation: 39

How to use a QStyledItemDelegate to render QIcons for a column?

I am using a QTableView and QSqlTableModel to show data from a sqlite DB. In the DB (and model) there is a column with fields that contain either paths ie: '/home/foo/bar.txt' or nothing. For this column in the view I would like to render one icon for items with a path, and a different icon for items with nothing (and not render the actual data/path in the view at all).
I think I need to set up a QStyledItemDelegate to render icons in place of the data, but the staritemdelelgate from the included examples highlights the editor function of the delegate (which I do not want) without shedding any light on how to render QIcons (or maybe I am just missing it). I have looked through the API, but I am unclear as to how to subclass a QStyledItemDelegate, or even if I need to for this use case.
Some guidance on whether this is a viable method, or an example of how to use a QStyledItemDelegate to render icons for a column (preferably in python) would be appreciated.

EDIT: Petr's post solved the issue. A full implementation of the situation I described, based on Petr's solution is:

def data(self, index, role=QtCore.Qt.DisplayRole):  
    if index.column() == 2:  
        if role == QtCore.Qt.DecorationRole:  
            filename = super(MovieModel, self).data(index, QtCore.Qt.DisplayRole)  
            if not filename == '':  
                return self.yes_icon  
            else:  
                return self.no_icon    
        elif role == QtCore.Qt.DisplayRole:  
            return ''  
    #Other columns/roles:  
    return super(MovieModel, self).data(index, role)

Hope it helps.

Upvotes: 1

Views: 937

Answers (1)

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Reputation: 66930

Instead of subclassing the delegate, you can subclass the model, and return the icon in the item's DecorationRole.

Untested sketch of solution:

class IconModel(QSqlTableModel):
    def data(self, index, role=Qt.DisplayRole):
        if index.column() == FILENAME_COLUMN_INDEX:
             if role == Qt.DecorationRole:
                  filename = super(IconModel, self).data(index, Qt.DisplayRole)
                  return icon_for_filename(filename)
             elif role == Qt.DisplayRole:
                  return ''
        # Other columns/roles:
        return super(IconModel, self).data(index, role)

Subclassing delegates is much more of a pain.

Upvotes: 1

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