如何使用QSortFilterProxyModel自定义QComplete完成规则

Question

例如，我的QComboBox下拉列表中有这三项

chicken soup
chilli peppers
grilled chicken

输入"ch"将匹配"鸡汤"one_answers"辣椒"，但不匹配"烤鸡"。

我想要的是能够输入"ch"并匹配所有它们，或者更具体地说，"鸡肉"并匹配"鸡汤"one_answers"烤鸡"。

参考：https://bugreports.qt-project.org/browse/QTBUG-7830

下面的代码只工作一次，为什么？如果你输入"a"，所有包含"a"的字符串都显示正确，你会得到3个结果，"Jane Doe"，"Albert Einstein"，"Alfred E Newman"但如果继续输入"n"，则下拉菜单中不会显示任何结果。

编辑：它可以工作，但弹出的QListView没有正确显示（如果按下向下箭头键，匹配的项目将显示在组合框编辑区域，但下拉列表不会显示）

from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4 import QtGui,QtCore
import sys
import signal
signal.signal(signal.SIGINT, signal.SIG_DFL)

class MyGui(QDialog): 
    def __init__(self, parent=None): 
        super(MyGui,self).__init__(parent)
        model = QtGui.QStringListModel()
        wordList = ['John Doe','Jane Doe','Albert Einstein', 'Alfred E Newman']
        model.setStringList(wordList)
        layout = QtGui.QVBoxLayout(self)
        self.line = QtGui.QLineEdit(self)
        layout.addWidget(self.line)
        self.combobox = QComboBox(parent)
        layout.addWidget(self.combobox)
        self.combobox.addItems(wordList)
        self.combobox.setEditable(True)
        self.setLayout(layout)
        complete = CustomQCompleter2(self)
        complete.setModel(model)
        complete.setCaseSensitivity(QtCore.Qt.CaseInsensitive)
        complete.setCompletionMode(QCompleter.UnfilteredPopupCompletion)
        complete.setWrapAround(False)
        self.line.setCompleter(complete)
        self.combobox.setCompleter(complete)
        self.combobox.setEditText('')
        self.setGeometry(200, 100, 400, 300)

class CustomQCompleter2(QCompleter):
    def __init__(self, parent=None):
        super(CustomQCompleter2, self).__init__(parent)
        self.local_completion_prefix = ""
        self.source_model = None
    def setModel(self, model):
        self.source_model = model
        super(CustomQCompleter2, self).setModel(self.source_model)
    def updateModel(self):
        local_completion_prefix = self.local_completion_prefix
        class InnerProxyModel(QSortFilterProxyModel):
            def filterAcceptsRow(self, sourceRow, sourceParent):
                index0 = self.sourceModel().index(sourceRow, 0, sourceParent)
                searchStr = local_completion_prefix.lower()
                modelStr = self.sourceModel().data(index0,Qt.DisplayRole).toString().toLower()
                print searchStr,' in ',modelStr, searchStr in modelStr
                return searchStr in modelStr

        proxy_model = InnerProxyModel()
        proxy_model.setSourceModel(self.source_model)
        super(CustomQCompleter2, self).setModel(proxy_model)
        print 'match :',proxy_model.rowCount()

    def splitPath(self, path):
        self.local_completion_prefix = str(path)
        self.updateModel()
        return ""
if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    gui = MyGui()
    gui.show()
    sys.exit(app.exec_())

Answer 1

在完成符的updateModel方法的末尾添加以下代码可以解决问题，但我不知道为什么它能工作。

cr=QRect(QPoint(1, 1), QSize(1, 1))
self.complete(cr)