传递给mapToSource的错误模型的PyQt QSortFilterProxyModel索引？

Question

我想得到存储在[(1, 'cb'), (3, 'cd'), (7, 'ca'), (11, 'aa'), (22, 'bd')]的整数我选择下拉自动完成项目。

因为我使用了QSortFilterProxyModel，所以当使用向下键来选择项时，索引来自代理模型。

我在文档中读到我应该使用mapToSource来获取原始模型中的索引，但是这里我index from wrong model passed to mapToSource得到了一个错误消息index from wrong model passed to mapToSource而index.row()总是-1。 我错过了什么？ 谢谢！

错误是：

row in proxy model 0
QSortFilterProxyModel: index from wrong model passed to mapToSource 
row in original model -1

码：

from PyQt4.QtCore import *
from PyQt4.QtGui import *


import sys
import re
import signal
signal.signal(signal.SIGINT, signal.SIG_DFL)


class MyModel(QStandardItemModel):

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

    def data(self, index, role):

        symbol = self.symbol_data[index.row()]
        if role == Qt.DisplayRole:
            return symbol[1]

        elif role == Qt.UserRole:
            return symbol[0]

    def setup(self, data):
        self.symbol_data = data
        for line, name in data:
            item = QStandardItem(name)
            self.appendRow(item)


class MyGui(QDialog):

    def __init__(self, parent=None):

        super(MyGui, self).__init__(parent)

        symbols = [(1, 'cb'), (3, 'cd'), (7, 'ca'), (11, 'aa'), (22, 'bd')]

        model = MyModel()
        model.setup(symbols)

        layout = QVBoxLayout(self)
        self.line = QLineEdit(self)

        layout.addWidget(self.line)

        self.setLayout(layout)

        completer = CustomQCompleter()

        completer.setModel(model)
        completer.setCaseSensitivity(Qt.CaseInsensitive)
        completer.setCompletionMode(QCompleter.UnfilteredPopupCompletion)
        completer.setWrapAround(False)

        self.line.setCompleter(completer)

        self.completer = completer

        self.completer.highlighted[QModelIndex].connect(self.test)

        # qApp.processEvents()
        # QTimer.singleShot(0, self.completer.complete)
        self.line.textChanged[QString].connect(self.pop)

    def pop(self, *x):
        text = x[0]
        self.completer.splitPath(text)
        QTimer.singleShot(0, self.completer.complete)

        self.line.setFocus()

    def test(self, index):
        print 'row in proxy model', index.row()
        print 'row in original model', self.completer.model().mapToSource(index).row()
        # print 'line in original model:',
        # self.completer.model().sourceModel().symbol_data[x[0].row()][0]


class CustomQCompleter(QCompleter):

    def __init__(self, parent=None):
        super(CustomQCompleter, self).__init__(parent)
        self.local_completion_prefix = ""
        self.source_model = None
        self.first_down = True

    def setModel(self, model):
        self.source_model = model
        self._proxy = QSortFilterProxyModel(
            self, filterCaseSensitivity=Qt.CaseInsensitive)
        self._proxy.setSourceModel(model)
        super(CustomQCompleter, self).setModel(self._proxy)

    def splitPath(self, path):
        self.local_completion_prefix = str(path)
        self._proxy.setFilterFixedString(path)
        return ""

    def eventFilter(self,  obj,  event):

        if event.type() == QEvent.KeyPress:
            'This is used to mute the connection to clear lineedit'
            if event.key() in (Qt.Key_Down, Qt.Key_Up):
                curIndex = self.popup().currentIndex()

                if event.key() == Qt.Key_Down:
                    if curIndex.row() == self._proxy.rowCount()-1:
                        print 'already last row', curIndex.row()
                        if self._proxy.rowCount() == 1:
                            pass
                        else:
                            return True
                else:
                    if curIndex.row() == 0:
                        print 'already first row'
                        return True

                if curIndex.row() == 0 and self.first_down:
                    print 'already row 0 first'
                    self.popup().setCurrentIndex(curIndex)
                    self.first_down = False
                    return True

        super(CustomQCompleter, self).eventFilter(obj,  event)
        return False


if __name__ == '__main__':

    app = QApplication(sys.argv)
    gui = MyGui()
    gui.show()
    sys.exit(app.exec_())

更新：此问题已解决，感谢Avaris在#pyqt的帮助。 事实证明，我可以这样做将索引映射到原始模型

proxy_index= self.completer.completionModel().mapToSource(index)
print 'original row:', self.completer.model().mapToSource(proxy_index).row()

甚至更好：

print 'data:', index.data(Qt.UserRole).toPyObject()

因为：“completionModel（）实际上是.model（）上的代理模型

你不需要乱用mapToSource。 无论返回哪个索引，index.data（Qt.UserRole）都应该为您提供该数字

只是一个fyi，你很少需要在（代理）模型之外使用mapToSource。 它主要供内部使用。 适当的代理应该转发来自源的所有相关查询。 所以你可以使用代理，就好像你正在使用源代码-Avaris“

Answer 1

在此处粘贴正确的代码以供参考

from PyQt4.QtCore import *
from PyQt4.QtGui import *


import sys
import re
import signal
signal.signal(signal.SIGINT, signal.SIG_DFL)


class MyModel(QStandardItemModel):

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

    def data(self, index, role):

        symbol = self.symbol_data[index.row()]
        if role == Qt.DisplayRole:
            return symbol[1]

        elif role == Qt.UserRole:
            return symbol[0]

    def setup(self, data):
        self.symbol_data = data
        for line, name in data:
            item = QStandardItem(name)
            self.appendRow(item)


class MyGui(QDialog):

    def __init__(self, parent=None):

        super(MyGui, self).__init__(parent)

        symbols = [(1, 'cb'), (3, 'cd'), (7, 'ca'), (11, 'aa'), (22, 'bd')]

        model = MyModel()
        model.setup(symbols)

        layout = QVBoxLayout(self)
        self.line = QLineEdit(self)

        layout.addWidget(self.line)

        self.setLayout(layout)

        completer = CustomQCompleter()

        completer.setModel(model)
        completer.setCaseSensitivity(Qt.CaseInsensitive)
        completer.setCompletionMode(QCompleter.UnfilteredPopupCompletion)
        completer.setWrapAround(False)

        self.line.setCompleter(completer)

        self.completer = completer

        self.completer.highlighted[QModelIndex].connect(self.test)

        # QTimer.singleShot(0, self.completer.complete)
        self.line.textChanged[QString].connect(self.pop)

    def pop(self, *x):
        text = x[0]
        self.completer.splitPath(text)
        QTimer.singleShot(0, self.completer.complete)

        self.line.setFocus()

    def test(self, index):
        print 'row in completion model', index.row()
        print 'data:', index.data(Qt.UserRole).toPyObject()

class CustomQCompleter(QCompleter):

    def __init__(self, parent=None):
        super(CustomQCompleter, self).__init__(parent)
        self.local_completion_prefix = ""
        self.source_model = None
        self.first_down = True

    def setModel(self, model):
        self.source_model = model
        self._proxy = QSortFilterProxyModel(
            self, filterCaseSensitivity=Qt.CaseInsensitive)
        self._proxy.setSourceModel(model)
        super(CustomQCompleter, self).setModel(self._proxy)

    def splitPath(self, path):
        self.local_completion_prefix = str(path)
        self._proxy.setFilterFixedString(path)
        return ""

    def eventFilter(self,  obj,  event):

        if event.type() == QEvent.KeyPress:
            'This is used to mute the connection to clear lineedit'
            if event.key() in (Qt.Key_Down, Qt.Key_Up):
                curIndex = self.popup().currentIndex()

                if event.key() == Qt.Key_Down:
                    if curIndex.row() == self._proxy.rowCount()-1:
                        print 'already last row', curIndex.row()
                        if self._proxy.rowCount() == 1:
                            pass
                        else:
                            return True
                else:
                    if curIndex.row() == 0:
                        print 'already first row'
                        return True

                if curIndex.row() == 0 and self.first_down:
                    print 'already row 0 first'
                    self.popup().setCurrentIndex(curIndex)
                    self.first_down = False
                    return True

        super(CustomQCompleter, self).eventFilter(obj,  event)
        return False


if __name__ == '__main__':

    app = QApplication(sys.argv)
    gui = MyGui()
    gui.show()
    sys.exit(app.exec_())