PyQt 自定义控件--带搜索和全选功能的复选框

import sys
from PyQt5.QtWidgets import QApplication, QListWidget, QLineEdit, QCheckBox, QListWidgetItem
from PyQt5.QtCore import Qt


class FilteredList(QListWidget):
    #继承自列表控件
    def __init__(self, textList, parent=None):
        super().__init__(parent)
        search = QLineEdit("搜索")
        search.selectAll()
        search.returnPressed.connect(self.on_return) # 检测回车信号
        search.setToolTip('不区分大小写搜索。可通过"/"设置搜索多个内容')
        search.setToolTipDuration(1000) # 1000ms

        item = QListWidgetItem(self)
        self.setItemWidget(item, search )#列表控件的首项 设为 QlineEdit

        self.selectAll_ch = QCheckBox("全选(selectAll)")
        self.selectAll_ch.setChecked(False)
        self.selectAll_ch.stateChanged[int].connect(self.on_selectAll)#
        item = QListWidgetItem(self)
        self.setItemWidget(item, self.selectAll_ch )#列表控件的项设为 QCheckBox

        # setCheckState 方法用于设置 QCheckBox 的状态为选中（Qt.Checked）、半选中（ Qt.PartiallyChecked）或未选中（Qt.Unchecked）
        self.boxes = []
        for index, text in enumerate(textList):
            ch = QCheckBox(text)
            ch.setTristate(False)
            ch.setChecked(False)
            ch.stateChanged[int].connect(self.on_stateChanged)
            item = QListWidgetItem(self)
            self.setItemWidget(item, ch)
            self.boxes.append(ch)

        self.checkedQty = 0
        self.count = len(textList)

    # / 如果想要通过代码改变QCheckBox的状态，同时不触发槽函数，
    # // 可以简单地阻塞信号，并且之后重新启用它们
    # checkBox->blockSignals(true);
    # checkBox->setCheckState(Qt::Checked);
    # checkBox->blockSignals(false);

    def on_return(self):
        # print("enter pressed")
        text = self.sender().text()
        if text == "":
            return
        for ch in self.boxes:
            ch.setChecked(False)
        for string in text.upper().split("/"):
            for ch in self.boxes:
                if ch.text().upper().find(string) != -1:
                    ch.setChecked(True)
            
    def on_selectAll(self, state):

        #for ch in self.findChildren(QCheckBox): 
            #print(ch)
        if state == 0:
            for ch in self.boxes:
                ch.setChecked(False)
            self.checkedQty = 0

        elif state == 2:
            for ch in self.boxes:
                ch.setChecked(True)
            self.checkedQty = self.count

                       
    def on_stateChanged(self, state): # state 传入的是改变后的状态. #0 不选中， 1 部分选中，2 全选中
        # print(state, self.count, self.checkedQty)
        # ch = self.sender()
        if state:
            self.checkedQty += 1
            if self.checkedQty == self.count:
                self.selectAll_ch.setCheckState(2)
            else:
                self.selectAll_ch.setCheckState(1)
        else: # state == 0
            self.checkedQty -= 1
            if self.checkedQty > 0:
                self.selectAll_ch.setCheckState(1)
            else:
                self.selectAll_ch.setCheckState(0)


    def keyPressEvent(self, event):
        #Ctrl+A 全选
        if event.modifiers() & Qt.ControlModifier and event.key()==Qt.Key_A:
            self.selectAll_ch.setCheckState(2)



if __name__ == '__main__':
    app = QApplication(sys.argv)
    myList = FilteredList(textList=["张三","李四","王五","赵六"])
    myList.show()
    sys.exit(app.exec_())