多个单选按钮组正在链接,从而导致异常行为

时间:2020-06-10 15:27:25

标签: python pyqt5 python-3.7 qradiobutton qbuttongroup

我的程序基于SQL数据即时生成表单。我在它们旁边制作了两个单选按钮和一个QLineEdit条目。选中右侧的单选按钮后,将正确启用QLineEdit。问题来自单选按钮之间的链接,并导致它们之间的排他性操作。程序启动时,它们如下所示: Program start

然后,当我单击第一个“否”时,它将更改我的期望并启用QLineEdit。 Normal behavior

现在,我也要为“序列号:RC1”单击“否”。这是行为开始出错的地方。 单击“否”按钮,然后取消选择上面的所有行。

Deselects the top row

如果我尝试再次单击第一行的“否”,则取消选择第二行的“是”。

second row deselects

最后,我可以单击“选定”单选按钮,然后取消选择所有内容,直到剩下一个活动的单选按钮。在这一点上,我不能只选择一个按钮。单击取消选择的按钮将激活它,然后取消选择先前处于活动状态的按钮。

One selected Button Left

我通过将单选按钮放入QButtonGroups的辅助函数即时生成按钮。我认为这足以阻止这种行为,但是我错了。 我想要的是每行上的单选按钮不响应其他行上其他单选按钮的操作。

# !/user/bin/env python
import os
import sys
from PyQt5 import uic
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *


class Radio(QDialog):
    def __init__(self, app):
        super(Radio, self).__init__()
        self.bundle_dir = os.path.dirname(__file__)
        gui_path = os.path.join(self.bundle_dir, 'ui', 'radio_bt_test.ui')
        self.ui = uic.loadUi(gui_path, self)
        self.num_of_row = 4
        self.formLayout = self.findChild(QFormLayout, "formLayout")
        self.radio_bt_lineEdit_connections = dict()  # to help link the radio buttons and lineEdit
        self.add_rows()
        self.show()

    def add_rows(self):
        """
        Adds pairs of radio buttons with a lineEdit to each row of the form layout
        :return: 
        """
        for i in range(self.num_of_row):
            lbl = QLabel("Label#" + str(i))
            hbox = QHBoxLayout()
            buttons = self.new_radio_pair()
            entry = self.new_entry("Value if No")
            entry.setEnabled(False)
            self.radio_bt_lineEdit_connections[buttons[-1]] = entry
            # adding connection to dictionary for later event handling
            buttons[-1].toggled.connect(self.radio_bt_changed)
            for button in buttons:
                hbox.addWidget(button)
            hbox.addWidget(entry)
            self.formLayout.addRow(lbl, hbox)

    def new_radio_pair(self, texts=('Yes', 'No')) -> list:
        """
        Makes a pair of radio buttons in a button group for creating data entries in "Part" grouping on the fly
        :param texts: The texts that will go on the two buttons. The more texts that are added to make more radio buttons
        :return: A list with QRadioButtons that are all part of the same QButtonGroup
        """
        group = QButtonGroup()
        buttons = []
        for text in texts:
            bt = QRadioButton(text)
            bt.setFont(QFont('Roboto', 11))
            if text == texts[0]:
                bt.setChecked(True)
            group.addButton(bt)
            buttons.append(bt)

        return buttons

    def radio_bt_changed(self) -> None:
        """
        Helps the anonymous radio buttons link to the anonymous QLineEdits that are made for data fields
        :return: None
        """
        sender = self.sender()
        assert isinstance(sender, QRadioButton)
        lineEdit = self.radio_bt_lineEdit_connections[sender]
        assert isinstance(lineEdit, QLineEdit)
        if sender.isChecked():
            lineEdit.setEnabled(True)
        else:
            lineEdit.setEnabled(False)
            lineEdit.clear()

    def new_entry(self, placeholder_text: str = "") -> QLineEdit:
        """
        Makes a new QLineEdit object for creating data entries in "Part" grouping on the fly
        :return: A new QLineEdit with appropriate font and size policy
        """
        entry = QLineEdit()
        entry.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Fixed)
        entry.setFont(QFont('Roboto', 11))
        entry.setStyleSheet("background-color: rgb(239, 241, 243);")
        # with style sheets, past anything in here between the css tags
        entry.setMaxLength(15)
        entry.setPlaceholderText(placeholder_text)
        return entry


def main():
    app = QApplication(sys.argv)
    radio = Radio(app)
    sys.exit(app.exec())

main()

可能是因为我声明了QButtonGroup然后忘记了它们吗?是因为我没有分配变量,还是因为我遗漏了另一个问题,垃圾收集器会来清除它们吗?

ui是在QtDesigner上设计的,只是一个带有表单布局的对话框。

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Dialog</class>
 <widget class="QDialog" name="Dialog">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>491</width>
    <height>382</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Dialog</string>
  </property>
  <property name="styleSheet">
   <string notr="true">background-color: rgb(219, 221, 223);</string>
  </property>
  <widget class="QWidget" name="formLayoutWidget">
   <property name="geometry">
    <rect>
     <x>80</x>
     <y>40</y>
     <width>301</width>
     <height>291</height>
    </rect>
   </property>
   <layout class="QFormLayout" name="formLayout"/>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>

1 个答案:

答案 0 :(得分:1)

用于使行按钮互斥的对象是“组”,但这是一个局部变量,当new_radio_pair方法完成执行时,该局部变量将被破坏,从而导致其行为不像以前想象的那样。

解决方案是延长生命周期,为此有多种选择,例如使其成为类的属性,将其添加到具有较长生命周期的容器或类中,或者对于QObjects,则通过另一个QObject作为父对象(如self)具有更长的生命周期,这是这种情况下的最佳解决方案:

group = QButtonGroup(self)