具有自动完成功能的 QComboBox 在 PyQt4 中有效，但在 PySide 中无效

问题描述

我有一个带有自定义完成器的组合框，它在 PyQt4 中运行良好，但在 PySide 中不起作用.

I've got a combo box with a custom completer that worked fine in PyQt4, but isn't working in PySide.

我已经验证新的完成器正在替换 QComboBox 的内置完成器，因为内联完成不再发生.但是，当与 PySide 一起运行时，完成程序不会弹出过滤选项列表.

I have verified that the new completer is replacing the QComboBox's built in completer because inline completion is no longer occurring. However when run with PySide, the completer doesn't popup with a filtered list of options.

我还尝试确保所有文本都是 str 或所有 unicode 以避免 PyQt API 1 与 QStrings 和 PySide 使用 Python unicode 类型之间的差异.更改文本类型对 PyQt 或 PySide 的行为都没有影响(PyQt 继续工作，PySide 不起作用).

I've also tried ensuring that all text is all str or all unicode to avoid differences between the PyQt API 1 with QStrings and PySide's use of Python unicode types. Changing the text types has had no effect on either PyQt or PySide's behavior (PyQt keeps working, PySide doesn't work).

这是我的代码:

from PySide import QtCore
from PySide import QtGui 

#from PyQt4 import QtCore
#from PyQt4 import QtGui


class AdvComboBox(QtGui.QComboBox):
    def __init__(self, parent=None):
        super(AdvComboBox, self).__init__(parent)

        self.setFocusPolicy(QtCore.Qt.StrongFocus)
        self.setEditable(True)

        # add a filter model to filter matching items
        self.pFilterModel = QtGui.QSortFilterProxyModel(self)
        self.pFilterModel.setFilterCaseSensitivity(QtCore.Qt.CaseInsensitive)
        self.pFilterModel.setSourceModel(self.model())

        # add a completer, which uses the filter model
        self.completer = QtGui.QCompleter(self.pFilterModel, self)
        # always show all (filtered) completions
        self.completer.setCompletionMode(QtGui.QCompleter.UnfilteredPopupCompletion)

        self.setCompleter(self.completer)

        # connect signals

        def filter(text):
            print "Edited: ", text, "type: ", type(text)
            self.pFilterModel.setFilterFixedString(str(text))

        self.lineEdit().textEdited[unicode].connect(filter)
        self.completer.activated.connect(self.on_completer_activated)

    # on selection of an item from the completer, select the corresponding item from combobox
    def on_completer_activated(self, text):
        print "activated"
        if text:
            print "text: ", text
            index = self.findText(str(text))
            print "index: ", index
            self.setCurrentIndex(index)


    # on model change, update the models of the filter and completer as well
    def setModel(self, model):
        super(AdvComboBox, self).setModel(model)
        self.pFilterModel.setSourceModel(model)
        self.completer.setModel(self.pFilterModel)


    # on model column change, update the model column of the filter and completer as well
    def setModelColumn(self, column):
        self.completer.setCompletionColumn(column)
        self.pFilterModel.setFilterKeyColumn(column)
        super(AdvComboBox, self).setModelColumn(column)


if __name__ == "__main__":
    import sys

    app = QtGui.QApplication(sys.argv)

    combo = AdvComboBox()

    names = ['bob', 'fred', 'bobby', 'frederick', 'charles', 'charlie', 'rob']

    # fill the standard model of the combobox
    combo.addItems(names)
    combo.setModelColumn(0)
    combo.resize(300, 40)
    combo.show()

    sys.exit(app.exec_())

推荐答案

我在写问题的时候想通了...

I figured it out while writing the question...

看来，虽然 PySide QCompleter 文档 列出了使用模型和父级初始化 QCompleter 的选项，但它实际上不起作用.

It appears that while the PySide QCompleter documentation lists an option to initialize the QCompleter with a model and a parent, it isn't actually working.

解决方法是在完成者初始化后设置模型.

The solution is to set the model of the completer after it is initialized.

这是工作代码:

from PySide import QtCore
from PySide import QtGui 


class AdvComboBox(QtGui.QComboBox):
    def __init__(self, parent=None):
        super(AdvComboBox, self).__init__(parent)

        self.setFocusPolicy(QtCore.Qt.StrongFocus)
        self.setEditable(True)

        # add a filter model to filter matching items
        self.pFilterModel = QtGui.QSortFilterProxyModel(self)
        self.pFilterModel.setFilterCaseSensitivity(QtCore.Qt.CaseInsensitive)
        self.pFilterModel.setSourceModel(self.model())

        # add a completer
        self.completer = QtGui.QCompleter(self)
        #Set the model that the QCompleter uses
        # - in PySide doing this as a separate step worked better
        self.completer.setModel(self.pFilterModel)
        # always show all (filtered) completions
        self.completer.setCompletionMode(QtGui.QCompleter.UnfilteredPopupCompletion)

        self.setCompleter(self.completer)

        # connect signals

        def filter(text):
            print "Edited: ", text, "type: ", type(text)
            self.pFilterModel.setFilterFixedString(str(text))

        self.lineEdit().textEdited[unicode].connect(filter)
        self.completer.activated.connect(self.on_completer_activated)

    # on selection of an item from the completer, select the corresponding item from combobox
    def on_completer_activated(self, text):
        print "activated"
        if text:
            print "text: ", text
            index = self.findText(str(text))
            print "index: ", index
            self.setCurrentIndex(index)


    # on model change, update the models of the filter and completer as well
    def setModel(self, model):
        super(AdvComboBox, self).setModel(model)
        self.pFilterModel.setSourceModel(model)
        self.completer.setModel(self.pFilterModel)


    # on model column change, update the model column of the filter and completer as well
    def setModelColumn(self, column):
        self.completer.setCompletionColumn(column)
        self.pFilterModel.setFilterKeyColumn(column)
        super(AdvComboBox, self).setModelColumn(column)


if __name__ == "__main__":
    import sys

    app = QtGui.QApplication(sys.argv)

    combo = AdvComboBox()

    names = ['bob', 'fred', 'bobby', 'frederick', 'charles', 'charlie', 'rob']

    # fill the standard model of the combobox
    combo.addItems(names)
    combo.setModelColumn(0)
    combo.resize(300, 40)
    combo.show()

    sys.exit(app.exec_())

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