PyQt - Auto Completer with QLineEdit multiple times

问题

I want to have the possibility to use multiple times the auto completer in my QLineEdit, I found example using QTextEdit but I can't find for QLineEdit. here is a piece of code I use (very simple one) :

from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
from PyQt5.QtWidgets import *
import sys

def main():    
    app     = QApplication(sys.argv)
    edit    = QLineEdit()
    strList = ["Germany", "Spain", "France", "Norway"]
    completer = QCompleter(strList,edit)

    edit.setCompleter(completer)
    edit.show()

    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

For example, I want the completer to "start predicting" again the words in the same QLineEdit if I add a comma. Thanks.

回答1:

I've found the answer if it can help others, I created a class for Completer :

class Completer(QtWidgets.QCompleter):

    def __init__(self, parent=None):
        super(Completer, self).__init__(parent)

        self.setCaseSensitivity(Qt.CaseInsensitive)
        self.setCompletionMode(QtWidgets.QCompleter.PopupCompletion)
        self.setWrapAround(False)

    # Add texts instead of replace
    def pathFromIndex(self, index):
        path = QtWidgets.QCompleter.pathFromIndex(self, index)

        lst = str(self.widget().text()).split(',')

        if len(lst) > 1:
            path = '%s, %s' % (','.join(lst[:-1]), path)

        return path

    # Add operator to separate between texts
    def splitPath(self, path):
        path = str(path.split(',')[-1]).lstrip(' ')
        return [path]

And I use it within a class for QLineEdit like :

class TextEdit(QtWidgets.QLineEdit):

    def __init__(self, parent=None):
        super(TextEdit, self).__init__(parent)

        self.setPlaceholderText("example : ")
        self._completer = Completer(self)
        self.setCompleter(self._completer)

回答2:

Solution for PyQt4:

from PyQt4 import QtCore, QtGui

class Completer(QtGui.QCompleter):
    def __init__(self, *args, **kwargs):
        super(Completer, self).__init__(*args, **kwargs)

        self.setCaseSensitivity(QtCore.Qt.CaseInsensitive)
        self.setCompletionMode(QtGui.QCompleter.PopupCompletion)
        self.setWrapAround(False)

    # Add texts instead of replace
    def pathFromIndex(self, index):
        path = QtGui.QCompleter.pathFromIndex(self, index)
        lst = str(self.widget().text()).split(',')
        if len(lst) > 1:
            path = '%s, %s' % (','.join(lst[:-1]), path)
        return path

    def splitPath(self, path):
        path = str(path.split(',')[-1]).lstrip(' ')
        return [path]

class TextEdit(QtGui.QLineEdit):
    def __init__(self, parent=None):
        super(TextEdit, self).__init__(parent)
        words = ["alpha", "omega", "omicron", "zeta"]
        self.setPlaceholderText("example : ")
        self._completer = Completer(words, self)
        self.setCompleter(self._completer)

if __name__ == '__main__':
    import sys
    app = QtGui.QApplication(sys.argv)
    w = TextEdit()
    w.show()
    sys.exit(app.exec_())

来源：https://stackoverflow.com/questions/35628257/pyqt-auto-completer-with-qlineedit-multiple-times