labeling.py

        field = vl.fields().at(idx)
        if isinstance(field, QgsField) and field.type() in [QVariant.Int, QVariant.String]:
            return True
        return False




EDITOR_WIDGET_REGISTRY_KEY = 'EOTSV_Labeling'
labelEditorWidgetFactory = None
def registerLabelShortcutEditorWidget():
    reg = QgsGui.editorWidgetRegistry()
    if not EDITOR_WIDGET_REGISTRY_KEY in reg.factories().keys():
        factory = LabelShortcutWidgetFactory(EDITOR_WIDGET_REGISTRY_KEY)
        reg.registerWidget(EDITOR_WIDGET_REGISTRY_KEY, factory)
    else:
        labelEditorWidgetFactory = reg.factories()[EDITOR_WIDGET_REGISTRY_KEY]