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我有一个要求，我需要根据在任何位置输入的文本在 pyqt 的 QLineEdit 小部件中显示自动完成结果。到目前为止，我可以从正文开始

例如：“嗨，我是 Slim shady” ，在这里我可以在输入“嗨”时看到自动完成中的所有文本，但我需要具有可以让我在句子的任何位置之间或从句子的任何位置进行搜索的功能。

我的代码是：-

from PySide import QtCore, QtGui

class AutoCompleteEdit(QtGui.QLineEdit):
    def __init__(self, model, separator = ' ', addSpaceAfterCompleting = True):
        super(AutoCompleteEdit, self).__init__()
        self._separator = separator
        self._addSpaceAfterCompleting = addSpaceAfterCompleting
        self._completer = QtGui.QCompleter(model)
        self._completer.setWidget(self)
        self.connect(
                self._completer,
                QtCore.SIGNAL('activated(QString)'),
                self._insertCompletion)
        self._keysToIgnore = [QtCore.Qt.Key_Enter,
                              QtCore.Qt.Key_Return,
                              QtCore.Qt.Key_Escape,
                              QtCore.Qt.Key_Tab]

    def _insertCompletion(self, completion):
        """
        This is the event handler for the QCompleter.activated(QString) signal,
        it is called when the user selects an item in the completer popup.
        """
        extra = len(completion) - len(self._completer.completionPrefix())
        extra_text = completion[-extra:]
        if self._addSpaceAfterCompleting:
            extra_text += ' '
        self.setText(self.text() + extra_text)

    def textUnderCursor(self):
        text = self.text()
        textUnderCursor = ''
        i = self.cursorPosition() - 1
        while i >=0 and text[i] != self._separator:
            textUnderCursor = text[i] + textUnderCursor
            i -= 1
        return textUnderCursor

    def keyPressEvent(self, event):
        if self._completer.popup().isVisible():
            if event.key() in self._keysToIgnore:
                event.ignore()
                return
        super(AutoCompleteEdit, self).keyPressEvent(event)
        completionPrefix = self.textUnderCursor()
        if completionPrefix != self._completer.completionPrefix():
            self._updateCompleterPopupItems(completionPrefix)
        if len(event.text()) > 0 and len(completionPrefix) > 0:
            self._completer.complete()
        if len(completionPrefix) == 0:
            self._completer.popup().hide()


    def _updateCompleterPopupItems(self, completionPrefix):
        """
        Filters the completer's popup items to only show items
        with the given prefix.
        """
        self._completer.setCompletionPrefix(completionPrefix)
        self._completer.popup().setCurrentIndex(
                self._completer.completionModel().index(0,0))

if __name__ == '__main__':
    def demo():
        import sys
        app = QtGui.QApplication(sys.argv)
        values = ['@call', '@bug', '+qtodotxt', '+sqlvisualizer', 'Hi, I am Slim shady']
        editor = AutoCompleteEdit(values)
        window = QtGui.QWidget()
        hbox = QtGui.QHBoxLayout()
        hbox.addWidget(editor)
        window.setLayout(hbox)
        window.show()

        sys.exit(app.exec_())

    demo()
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