PyQT5 實現下拉核取方塊

Bgods發表於2020-03-30
QT

最近用pyqt5寫了一個客戶端工具，需要到下拉核取方塊的效果，但是自帶的沒有提供，經網上查到以下ComboCheckBox 類可以實現；
主要是下拉單選和核取方塊的結合，繼承了 QComboBox 類，例項化 ComboCheckBox 即可實現下拉核取方塊。

程式碼如下：

from PyQt5.QtWidgets import QComboBox, QLineEdit, QListWidget, QCheckBox, QListWidgetItem

class ComboCheckBox(QComboBox):
    def loadItems(self, items):
        self.items = items
        self.items.insert(0, '全部')
        self.row_num = len(self.items)
        self.Selectedrow_num = 0
        self.qCheckBox = []
        self.qLineEdit = QLineEdit()
        self.qLineEdit.setReadOnly(True)
        self.qListWidget = QListWidget()
        self.addQCheckBox(0)
        self.qCheckBox[0].stateChanged.connect(self.All)
        for i in range(0, self.row_num):
            self.addQCheckBox(i)
            self.qCheckBox[i].stateChanged.connect(self.showMessage)
        self.setModel(self.qListWidget.model())
        self.setView(self.qListWidget)
        self.setLineEdit(self.qLineEdit)
        # self.qLineEdit.textChanged.connect(self.printResults)

    def showPopup(self):
        # 點選下拉的時候，重新重新整理資料，避免資料多的時候，下拉顯示不完整的問題
        self.loadItems(items=self.items[1:])
        return QComboBox.showPopup(self)

    def printResults(self):
        list = self.Selectlist()
        print(list)

    def addQCheckBox(self, i):
        self.qCheckBox.append(QCheckBox())
        qItem = QListWidgetItem(self.qListWidget)
        self.qCheckBox[i].setText(self.items[i])
        self.qListWidget.setItemWidget(qItem, self.qCheckBox[i])

    def Selectlist(self):
        Outputlist = []
        for i in range(1, self.row_num):
            if self.qCheckBox[i].isChecked() == True:
                Outputlist.append(self.qCheckBox[i].text())
        self.Selectedrow_num = len(Outputlist)
        return Outputlist

    def showMessage(self):
        Outputlist = self.Selectlist()
        self.qLineEdit.setReadOnly(False)
        self.qLineEdit.clear()
        show = ';'.join(Outputlist)

        if self.Selectedrow_num == 0:
            self.qCheckBox[0].setCheckState(0)
        elif self.Selectedrow_num == self.row_num - 1:
            self.qCheckBox[0].setCheckState(2)
        else:
            self.qCheckBox[0].setCheckState(1)
        self.qLineEdit.setText(show)
        self.qLineEdit.setReadOnly(True)

    def All(self, zhuangtai):
        if zhuangtai == 2:
            for i in range(1, self.row_num):
                self.qCheckBox[i].setChecked(True)
        elif zhuangtai == 1:
            if self.Selectedrow_num == 0:
                self.qCheckBox[0].setCheckState(2)
        elif zhuangtai == 0:
            self.clear()

    def clear(self):
        for i in range(self.row_num):
            self.qCheckBox[i].setChecked(False)

    def currentText(self):
        text = QComboBox.currentText(self).split(';')
        if text.__len__() == 1:
            if not text[0]:
                return None
            else:
                return "('{}')".format("','".join(text))
        else:
            return "('{}')".format("','".join(text))
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