[chaley]

Originally Posted by capink

I wonder if it is possible to add an additional nested layout instead, right above the font row, something like this

That is in effect what I did.

I added 6 invisible rows above the font size line. Each row is a named label and a QBoxLayout. You can add widgets to that layout (default layout direction is vertical), or you can add a nested layout to do something more complicated. I did it this way so that the labels will line up with the existing ones. Why more than 1? So you can have multiple labels. Why 6? Felt like a nice number.

Here is an example, gui2.actions.show_template_tester.py. I used two of the 6 lines. The first is a label with a single QComboBox widget. The second is a label with an embedded grid layout.

Spoiler:

    def show_template_editor(self, *args):
        view = self.gui.current_view()
        if view is not self.gui.library_view:
            return error_dialog(self.gui, _('No template tester available'),
                _('Template tester is not available for books '
                  'on the device.')).exec_()

        rows = view.selectionModel().selectedRows()
        if not rows:
            return error_dialog(self.gui, _('No books selected'),
                    _('One book must be selected'), show=True)
        if len(rows) > 1:
            return error_dialog(self.gui, _('Selected multiple books'),
                    _('Only one book can be selected'), show=True)

        index = rows[0]
        if index.isValid():
            db = view.model().db
            t = TemplateDialog(self.gui, self.previous_text,
                   mi=db.get_metadata(index.row(), index_is_id=False, get_cover=False),
                   text_is_placeholder=self.first_time)
            t.setWindowTitle(_('Template tester'))
            #---- EXAMPLE STARTS HERE
            t.user_label_1.setVisible(True)
            t.user_label_1.setText('Example combo box:')
            from PyQt5.Qt import QComboBox
            box = QComboBox(t)
            box.addItems(['one', 'two', 'three'])
            t.user_layout_1.addWidget(box)
            #----
            t.user_label_2.setVisible(True)
            t.user_label_2.setText('Example embedded layout:')
            from PyQt5.Qt import QGridLayout, QLabel
            gl = QGridLayout()
            w1 = QLabel('Grid Row 0 Col 0')
            gl.addWidget(w1, 0, 0)
            w1 = QLabel('Grid Row 1 Col 1')
            gl.addWidget(w1, 1, 1)
            t.user_layout_2.addLayout(gl)
            #---- EXAMPLE ENDS HERE
            if t.exec_() == QDialog.DialogCode.Accepted:
                self.previous_text = t.rule[1]
                self.first_time = False