[FIXED] PyQt - Fixed title for combobox

Issue

I want to create a PyQt combobox with a fixed title. More specific this means that I want to have a dropdown menu from which the user can select but the dropdown button is always labeled the same. So for example I want to create an option for the user to specify where the legend of a plot is drawn. The button for this should always be labled "Legend" but when you click on it, it opens a dropdown menu with the placing options such as "upper right", "upper left", "top", etc. Once the user selected an option the legend is updated but the button still sais "Legend". I have this so far:

    self.fnLegendButton = QtGui.QComboBox()
    self.fnLegendButton.addItems('Upper right,Lower right,Upper left,Lower left,Top,Disable'.split(','))
    self.fnLegendButton.setCurrentIndex(0)
    self.fnLegendButton.setToolTip('Select the legend position.')
    self.fnLegendButton.currentIndexChanged.connect( <positioning function> )
    self.fnLegendButton.setMaximumWidth(60)

Solution

Here's a working example:

import sys
from PyQt4 import QtGui, QtCore


class Example(QtGui.QWidget):

    def __init__(self):
        super(Example, self).__init__()

        self.initUI()

    def initUI(self):

        self.fnLegendButton = QtGui.QComboBox(self)
        self.fnLegendButton.addItems(
            'Legend,Upper right,Lower right,Upper left,Lower left,Top,Disable'.split(','))
        self.fnLegendButton.setCurrentIndex(0)
        self.fnLegendButton.setToolTip('Select the legend position.')
        self.fnLegendButton.currentIndexChanged[
            str].connect(self.avoid_db_change)
        self.fnLegendButton.setMaximumWidth(100)
        self.fnLegendButton.move(50, 50)

        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('QtGui.QCheckBox')
        self.show()

    def avoid_db_change(self, text):
        print("Processing {0} item".format(text))
        self.fnLegendButton.blockSignals(True)
        self.fnLegendButton.setCurrentIndex(0)
        self.fnLegendButton.blockSignals(False)


def main():

    app = QtGui.QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

The important bits of this code are inside the avoid_db_change, that function is the one used to keep the "Legend" text no matter which item you've pressed. Now, you don't want to fire that function again when self.fnLegendButton.setCurrentIndex(0) is executed, so to avoid that, you surround it by a couple of blockSignals methods. Just try to comment the blockSignals methods and you'll understand what this means.

Answered By - BPL