如何将复选框连接到 QComboBox答案

【问题标题】：How to connect checkboxes to a QComboBox如何将复选框连接到 QComboBox
【发布时间】：2021-08-19 20:26:21
【问题描述】：

我想在检查某些复选框时过滤 PyQt5 QCombobox 中的项目。

例子：

samplelist=["a1","a2","a3","b1","b2","b3"] 是 QCombobox comboBox 的项目列表，我有两个复选框 checkBoxa 和 checkBoxb。如果

checkboxa 选中和 checkboxb 未选中：comboBox 有项目 ["a1", "a2", "a3"]
checkboxa 未选中，checkboxb 已选中：comboBox 有项目 ["b1", "b2", "b3"]
checkboxa 未选中，checkboxb 未选中：comboBox 为空
checkboxa 已检查，checkboxb 已检查：comboBox 具有 samplelist

有谁知道如何将checkboxa 和checkbox 连接到comboBox 以实现所述结果？

最小示例（复选框未连接到组合框）

from PyQt5 import QtCore, QtWidgets
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *  

class ExampleWindow(QDialog):
    def __init__(self,parent=None):
        super(ExampleWindow,self).__init__(parent)

        mainLayout=QtWidgets.QGridLayout()
        
        samplelist=["a1","a2","a3","b1","b2","b3"]

        # Create combobox and add items.
        self.comboBox = QComboBox()
        self.comboBox.addItems(samplelist)

        #Create checkboxes
        self.checkBoxa = QCheckBox("Select a") 
        self.checkBoxb = QCheckBox("Select b")
        
        mainLayout.addWidget(self.comboBox,1,0,1,2)
        mainLayout.addWidget(self.checkBoxa,0,0,1,1)
        mainLayout.addWidget(self.checkBoxb,0,1,1,1)
        

        self.setLayout(mainLayout)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    mainWin = ExampleWindow()
    mainWin.show()
    sys.exit( app.exec_() )

【问题讨论】：

标签： python pyqt5 qcombobox qcheckbox

【解决方案1】：

由于您的问题不明确，我将假设每个 QCheckBox 都与一个字母相关联，并且您只想显示以与选中的 QCheckBox 相关联的字母开头的项目。如果是这样，那么最好基于项目创建模型并使用 QSortFilterProxyModel 过滤它们。

class FilterProxyModel(QSortFilterProxyModel):
    def __init__(self, parent=None):
        super().__init__(parent)
        self._letters = list()

    @property
    def letters(self):
        return self._letters

    @letters.setter
    def letters(self, letters):
        self._letters = letters.copy()
        self.invalidateFilter()

    def filterAcceptsRow(self, source_row, source_parent):
        index = self.sourceModel().index(source_row, 0, source_parent)
        data = index.data()
        return any(data.startswith(letter) for letter in self.letters)


class ExampleWindow(QDialog):
    def __init__(self, parent=None):
        super(ExampleWindow, self).__init__(parent)

        mainLayout = QGridLayout(self)

        letters = ("a", "b", "c", "d")

        samplelist = [f"{letter}{i}" for i in range(1, 5) for letter in letters]

        self.model = QStandardItemModel()
        for e in samplelist:
            item = QStandardItem(e)
            self.model.appendRow(item)

        self.proxy_model = FilterProxyModel()
        self.proxy_model.setSourceModel(self.model)

        self.comboBox = QComboBox()
        self.comboBox.setModel(self.proxy_model)

        self.checkboxs = []

        for i, letter in enumerate(letters):
            checkbox = QCheckBox(f"Select {letter}")
            checkbox.setProperty("letter", letter)
            checkbox.toggled.connect(self.handle_toggled)
            mainLayout.addWidget(checkbox, 0, i)
            self.checkboxs.append(checkbox)

        mainLayout.addWidget(self.comboBox, 1, 0, 1, len(letters))

        self.handle_toggled()

    def handle_toggled(self):
        letters = []
        for checkbox in self.checkboxs:
            if checkbox.isChecked():
                letters.append(checkbox.property("letter"))
        self.proxy_model.letters = letters

【讨论】：