Impossible to display an Icon in a QtTableView

[faldo1]

Hello all

My tableView is created at application level

I create a manager for that tableView

The column with index 1 should display an Icon depending on the state

But impossible, the column remains blank

Why ?

I tried png, jpg, 64px height, 24px height

Here is my code

Thanks

import sys
from PyQt6 import QtCore, QtWidgets
from PyQt6.QtCore import Qt
from PyQt6.QtGui import QIcon

class IconColumnDelegate(QtWidgets.QStyledItemDelegate):

    def __init__(self, parent=None):
        self.ioIconWarning = QIcon("../gfx/icons/warning24.jpg")
        QtWidgets.QStyledItemDelegate.__init__(self, parent)

    def createEditor(self, parent, option, index):
        """
        Important, otherwise an editor is created if the user clicks in this cell.
        """
        return None

    def paint(self, painter, option, index):

        if index.column() == 1:
            rect = option.rect
            self.ioIconWarning.paint(painter, rect, Qt.AlignmentFlag.AlignHCenter)
            return

        super().paint(painter, option, index)


class DirectoryScanFilesTableViewModel(QtCore.QAbstractTableModel):

    aoColumnTitles = ["Name", "Tags", "Size", "Path"]

    def __init__(self, data):
        super(DirectoryScanFilesTableViewModel, self).__init__()
        self._data = data

    def headerData(self, anSection, aoOrientation, aoRole):

        if aoOrientation == Qt.Orientation.Horizontal and aoRole == Qt.ItemDataRole.DisplayRole:
            return self.aoColumnTitles[anSection]

    def data(self, index, role):
        if role == Qt.ItemDataRole.DisplayRole:
            # See below for the nested-list data structure.
            # .row() indexes into the outer list,
            # .column() indexes into the sub-list

            return self._data[index.row()][index.column()]

    def rowCount(self, index):
        # The length of the outer list.
        return len(self._data)

    def columnCount(self, index):
        # The following takes the first sub-list, and returns
        # the length (only works if all rows are an equal length)
        return len(self._data[0])

class DirectoryScanFilesTableViewManager:

    ioModel                     = None
    ioDirectoryScanTableView    = None
    ioIconColumnDelegate        = None

    def __init__(self, aoDirectoryScanTableView):
        self.ioDirectoryScanTableView   = aoDirectoryScanTableView
        self.ioIconColumnDelegate       = IconColumnDelegate()
        self.ioDirectoryScanTableView.setItemDelegateForColumn(1, self.ioIconColumnDelegate)

    def SetData(self, aoData):
        self.ioModel = DirectoryScanFilesTableViewModel(aoData)
        self.ioDirectoryScanTableView.setModel(self.ioModel)
        self.ioDirectoryScanTableView.setColumnWidth(0, 200)
        self.ioDirectoryScanTableView.setColumnWidth(1, 200)
        self.ioDirectoryScanTableView.setColumnWidth(2, 200)
        self.ioDirectoryScanTableView.horizontalHeader().setStretchLastSection(True)

[SGaist]

Hi,

I don't have a computer at hand to test but you might be complicating your life a bit.

You can use the DecorationRole and return the icon you want there, no need for a delegate.

Same goes for keeping the column read only, you can do it in the model's flags method.

[faldo1]

@SGaist Hello,

Thanks, I will try

is it possible to have multiple icons in a column, depending on multiple states of each row ?

For example

• last payment too late (yes/no)
• important customer (yes / no)

Aso,

Thanks

[JonB]

@faldo1 You would need your own delegate for that. Whether multiple icons for multiple columns maps nicely to display in a single column is a different matter.

[SGaist]

@faldo1 how many icon combinations would you have ?

From what you described, as @JonB wrote, a custom item delegate will likely be the solution. But a simple one, just the paint event that retrieves the data and then paint the various icons.

[faldo1]

@SGaist Hello, Sgaist,

I have 4 distinct values I would like to combine in 4 on/off icons in a kind of "Status" column

I tried a simple delegate but it didn't work, the column is empty.

That's why I created this post.

I don't know if it can help you, but I remember

• the breakpoint in the delegate paint() function was reached, the size of rect was the size of the target cell in the TableView

• but the self.ioIconWarning.availableSizes() returned no value.

Best regards,

Dany

[mpergand]

@faldo1
Have a look HERE

[SGaist]

@faldo1 Are you sure the file was loaded successfully ?