CODEWITHSUNDEEP
pythonqttooltippyqt5
Xukrao
Xukrao

Reputation: 8634

Qt: display tooltip on LineEdit widget that is mapped to AbstractListModel

Situation

Below is a Qt example that contains an AbstractListModel and two display widgets that are linked to this model (a ListView and a LineEdit):

from PyQt5 import QtCore, QtWidgets

class ListModel(QtCore.QAbstractListModel):
    def __init__(self, data_values, tooltips, parent=None):
        super().__init__(parent)
        self.data_values = data_values
        self.tooltips = tooltips


    def rowCount(self, parent=QtCore.QModelIndex()):
        return len(self.data_values)


    def data(self, index, role=QtCore.Qt.DisplayRole):
        if (role == QtCore.Qt.DisplayRole or role == QtCore.Qt.EditRole):
            return self.data_values[index.row()]
        elif role == QtCore.Qt.ToolTipRole:
            return self.tooltips[index.row()]


class Window(QtWidgets.QWidget):
    def __init__(self):
        super().__init__()

        data_values = ['apple', 'pumpkin', 'orange']
        tooltips = [
            "Don't accept when offered by evil queen in disguise.",
            "Excellent halloween decoration.",
            "Good source of Vitamin C.",
        ]
        self.list_model = ListModel(data_values, tooltips)

        self.line_edit = QtWidgets.QLineEdit(parent=self)
        self.line_edit.setReadOnly(True)

        self.list_view = QtWidgets.QListView(parent=self)
        self.list_view.setModel(self.list_model)
        self.list_view.setCurrentIndex(self.list_model.index(0))

        self.mapper = QtWidgets.QDataWidgetMapper(parent=self)
        self.mapper.setModel(self.list_model)
        self.mapper.addMapping(self.line_edit, 0)
        self.mapper.toFirst()

        self.list_view.selectionModel().currentRowChanged.connect(self.mapper.setCurrentModelIndex)

        layout = QtWidgets.QVBoxLayout()
        layout.addWidget(self.list_view, 0)
        layout.insertSpacing(1, 40)
        layout.addWidget(self.line_edit, 2)
        self.setLayout(layout)


qt_application = QtWidgets.QApplication([])
window = Window()
window.show()
qt_application.exec_()

I have configured the data method of the AbstractListModel to supply tooltip texts to linked widgets. A tooltip indeed appears when the mouse cursor is placed over an item in the ListView. However no tooltip appears when the mouse cursor is placed over the LineEdit.

enter image description here

Problem

I would like for the LineEdit to display a tooltip with the text provided by the linked AbstractListModel. Is there any way at all to achieve this?

Upvotes: 2

Views: 1314

Answers (1)

m7913d
m7913d

Reputation: 11072

It is not possible to achieve this with QDataWidgetMapper. QDataWidgetMapper always uses the Qt::EditRole value of the model. One could suggest to use the overloaded version of addMapping and a TableModel with one column (section) for displaying and one for the tooltip, but this is not possible, because QDataWidgetMapper only allows you to implement one-to-one mapping:

If the widget is already mapped to a section, the old mapping will be replaced by the new one.

Solution

The easiest solution is to create a slot yourself which you connect to the currentRowChanged signal and which sets the tooltip (QWidget::setToolTip) and text (QLineEdit::setText) manually.

Upvotes: 3

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