如何根据文本输入过滤 PyQt QCombobox 项？

Question

我需要一个 QCombox，它根据文本输入过滤项目。如果我将 QCombobox 设置为可编辑，则用户可以插入文本并自动创建 QCompleter。但是项目没有被过滤，我不希望用户添加新项目。

是否有可能将此功能添加到 QCombobox？

Answer 1

试试这个代码，这是我在我的一个项目中使用的东西

import sys
from PyQt4.QtGui import QComboBox, QApplication, QCompleter, QSortFilterProxyModel, QStandardItemModel, QStandardItem
from PyQt4.QtCore import Qt

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

        self.setFocusPolicy( Qt.StrongFocus )
        self.setEditable( True )
        self.completer = QCompleter( self )

        # always show all completions
        self.completer.setCompletionMode( QCompleter.UnfilteredPopupCompletion )
        self.pFilterModel = QSortFilterProxyModel( self )
        self.pFilterModel.setFilterCaseSensitivity( Qt.CaseInsensitive )



        self.completer.setPopup( self.view() )


        self.setCompleter( self.completer )


        self.lineEdit().textEdited[unicode].connect( self.pFilterModel.setFilterFixedString )
        self.completer.activated.connect(self.setTextIfCompleterIsClicked)

    def setModel( self, model ):
        super(ExtendedCombo, self).setModel( model )
        self.pFilterModel.setSourceModel( model )
        self.completer.setModel(self.pFilterModel)

    def setModelColumn( self, column ):
        self.completer.setCompletionColumn( column )
        self.pFilterModel.setFilterKeyColumn( column )
        super(ExtendedCombo, self).setModelColumn( column )


    def view( self ):
        return self.completer.popup()

    def index( self ):
        return self.currentIndex()

    def setTextIfCompleterIsClicked(self, text):
      if text:
        index = self.findText(text)
        self.setCurrentIndex(index)

if __name__ == "__main__":
    app = QApplication(sys.argv)

    model = QStandardItemModel()

    for i,word in enumerate( ['hola', 'adios', 'hello', 'good bye'] ):
        item = QStandardItem(word)
        model.setItem(i, 0, item)



    combo = ExtendedCombo()
    combo.setModel(model)
    combo.setModelColumn(0)

    combo.show()

    sys.exit(app.exec_())

Answer 2

在组合框内搜索。终于有了一个好的解决方案。谢谢你们！！这对我帮助很大。

这里是调整后的 PyQt5 代码：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import Qt, QSortFilterProxyModel
from PyQt5.QtWidgets import QCompleter, QComboBox

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

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

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

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

        # connect signals
        self.lineEdit().textEdited.connect(self.pFilterModel.setFilterFixedString)
        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):
        if text:
            index = self.findText(text)
            self.setCurrentIndex(index)
            self.activated[str].emit(self.itemText(index))


    # on model change, update the models of the filter and completer as well 
    def setModel(self, model):
        super(ExtendedComboBox, 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(ExtendedComboBox, self).setModelColumn(column)    


if __name__ == "__main__":
    import sys
    from PyQt5.QtWidgets import QApplication
    from PyQt5.QtCore import QStringListModel

    app = QApplication(sys.argv)

    string_list = ['hola muchachos', 'adios amigos', 'hello world', 'good bye']

    combo = ExtendedComboBox()

    # either fill the standard model of the combobox
    combo.addItems(string_list)

    # or use another model
    #combo.setModel(QStringListModel(string_list))

    combo.resize(300, 40)
    combo.show()

    sys.exit(app.exec_())

Answer 3

感谢您的好回答，我遇到了同样的问题。 它工作得很好，但迫使您提供一个外部模型，这是不必要的。 我扩展了代码以使用组合框已经提供的内部标准模型。 还进行了一些清理和记录...

#!/usr/bin/env python
# -*- coding: utf-8 -*-
from PyQt4.QtCore import Qt
from PyQt4.QtGui import QCompleter, QComboBox, QSortFilterProxyModel

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

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

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

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

        # connect signals
        self.lineEdit().textEdited[unicode].connect(self.pFilterModel.setFilterFixedString)
        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):
        if text:
            index = self.findText(text)
            self.setCurrentIndex(index)


    # on model change, update the models of the filter and completer as well 
    def setModel(self, model):
        super(ExtendedComboBox, 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(ExtendedComboBox, self).setModelColumn(column)



if __name__ == "__main__":
    import sys
    from PyQt4.QtGui import QStringListModel, QApplication

    app = QApplication(sys.argv)

    string_list = ['hola muchachos', 'adios amigos', 'hello world', 'good bye']

    combo = ExtendedComboBox()

    # either fill the standard model of the combobox
    combo.addItems(string_list)

    # or use another model
    #combo.setModel(QStringListModel(string_list))

    combo.resize(300, 40)
    combo.show()

    sys.exit(app.exec_())

Answer 4

发布的两个答案都是正确的，但是它们有一个小错误，其中通过键入然后单击选择来过滤组合框中的选项不会导致激活信号触发。您可以通过将self.activated[str].emit(self.itemText(index)) 放在on_completer_activated 中，在self.setCurrentIndex(index) 之后的行上来解决此问题。

当您从完成程序中选择一个项目时，这会触发一个激活信号，其中包含被单击项目的名称。

Answer 5

如果有人感兴趣：pyqt5 的相同代码

    #!/usr/bin/python
    
    import sys
    
    from PyQt5.QtWidgets import QComboBox, QApplication, QCompleter
    from PyQt5.QtCore import QSortFilterProxyModel, Qt
    from PyQt5.Qt import QStringListModel
    
    
    class ExtendedComboBox(QComboBox):
        def __init__(self, parent=None):
            super(ExtendedComboBox, self).__init__(parent)
    
            self.setFocusPolicy(Qt.StrongFocus)
            self.setEditable(True)
    
            # add a filter model to filter matching items
            self.pFilterModel = QSortFilterProxyModel(self)
            self.pFilterModel.setFilterCaseSensitivity(Qt.CaseInsensitive)
            self.pFilterModel.setSourceModel(self.model())
    
            # add a completer, which uses the filter model
            self.completer = QCompleter(self.pFilterModel, self)
            # always show all (filtered) completions
            self.completer.setCompletionMode(QCompleter.UnfilteredPopupCompletion)
            self.setCompleter(self.completer)
    
            # connect signals
            self.lineEdit().textEdited[str].connect(self.pFilterModel.setFilterFixedString)
            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):
            if text:
                index = self.findText(text)
                self.setCurrentIndex(index)
                self.activated[str].emit(self.itemText(index))
    
    
        # on model change, update the models of the filter and completer as well
        def setModel(self, model):
            super(ExtendedComboBox, 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(ExtendedComboBox, self).setModelColumn(column)
    
    
    
    if __name__ == "__main__":
    
    
        app = QApplication(sys.argv)
    
        string_list = ['hola muchachos', 'adios amigos', 'hello world', 'good bye']
    
        combo = ExtendedComboBox()
    
        # either fill the standard model of the combobox
        combo.addItems(string_list)
    
        # or use another model
        #combo.setModel(QStringListModel(string_list))
    
        combo.resize(300, 40)
        combo.show()
    
        sys.exit(app.exec_())