如何根据文本输入筛选PyQt QComboBox的项目？

Question

我需要一个QComboBox，其中的项目是基于文本输入进行过滤的。如果我将QComboBox设置为可编辑，用户可以插入文本，QCompleter将自动创建。但是项目没有被过滤，我不希望用户添加新项目。

是否有可能向QComboBox添加此功能？

- Tammo B.

Answer 1

在组合框内进行搜索。终于找到了一个好的解决方案。谢谢你们！！这帮了我很多。

这是调整后的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_())

- Tamas Haver

Answer 2

尝试这段代码，这是我在自己的一个项目中使用过的东西。

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_())

- armonge

---

谢谢，这正是我正在寻找的。 - Tammo B.

它按照广告所说的那样工作。我遇到的一个小问题是，当我过滤复选框并通过鼠标单击选择一个选项时，当前索引更改信号不会立即发送，我必须先单击其他地方。 - ilpoldo

我还想补充一点，在PySide中让它正常工作，我必须首先使用仅父参数初始化完成器，然后使用self.completer.setModel(self.pFilterModel)设置模型。这让我很疯狂，但最终在写问题时我弄清楚了，所以我在这里记录了下来。 - flutefreak7

Answer 3

感谢您提供的好答案，我遇到了同样的问题。 它的表现很好，但是要求您提供一个外部模型，这是不必要的。 我扩展了代码，使其也适用于combobox已经提供的内部标准模型。 还进行了一些清理和文档化处理...

#!/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_())

- Dorian Scholz

Answer 4

两个回答都是正确的，但是它们存在一个小错误，即通过输入过滤组合框中的选项，然后点击选择并不会触发激活信号。您可以通过在 on_completer_activated 中在 self.setCurrentIndex(index)之后放置 self.activated [str] .emit（self.itemText（index）） 来解决此问题。

这将在从自动完成器中选择项目时触发一个包含所单击项目名称的激活信号。

- Matt Wetmore

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_())

- Joachim Bonfert

Answer 6

这非常简单。

index = your_combo.findText(searched_word, Qt.MatchFixedString)
if index >= 0:
    your_combo.setCurrentIndex(index)

您还可以使用Qt.MatchContain方法。 访问https://doc.qt.io/qt-6/qt.html了解更多详情。

- Hasan