Python pyqt5标签可见性未隐藏的问题
我试图隐藏未填写行编辑时创建的错误标签（“*”），然后在填写时使其消失，但我的程序不一致 它不起作用的一个例子：Python pyqt5标签可见性未隐藏的问题,python,python-3.x,pyqt,pyqt5,Python,Python 3.x,Pyqt,Pyqt5,我试图隐藏未填写行编辑时创建的错误标签（“*”），然后在填写时使其消失，但我的程序不一致 它不起作用的一个例子： 将三个插槽留空，然后按“添加学生”按钮-每个插槽旁边将显示一个红色星号 在第一行（“开始日期”）中输入任何内容，然后按“添加学生”按钮-红色星号将消失 对名字重复2，但红色星号不会消失 对姓氏重复2，但该姓氏的红色星号也不会消失 导入系统 导入日期时间 从PyQt5将QtWidgets导入为qt、QtGui、QtCore 类AddStudent（qt.QMainWindow）： 定义
我对您的代码做了以下更改：
self.errorFoundself.error可能会很有用。每次调用submit
函数时，我只需检查用户输入的文本是否为空QFormLayoutQGridLayoutQFormLayoutimport sys
import datetime
from PyQt5 import QtWidgets as qt, QtGui, QtCore
class MyApp(qt.QMainWindow):
def __init__(self):
super().__init__()
screenSize = qt.QDesktopWidget().screenGeometry(-1)
self.setup()
self.setWindowTitle("My Awesome App!")
def setup(self):
self.form = qt.QGroupBox("Add Student")
self.form_layout = qt.QFormLayout()
self.create_date_input()
self.create_first_name_input()
self.create_last_name_input()
self.create_submit_button()
self.form.setLayout(self.form_layout)
self.setContentsMargins(5, 5, 5, 5)
self.setCentralWidget(self.form)
def create_date_input(self):
self.date_label = qt.QLabel("Starting Date:")
self.date_entry = qt.QLineEdit(self)
date = str(datetime.date.today()).split("-")
today = date[1] + "/" + date[2] + "/" + date[0]
self.date_entry.setText(today)
self.form_layout.addRow(
self.date_label,
self.date_entry,
)
def create_first_name_input(self):
self.first_name_label = qt.QLabel("First Name:")
self.first_name_entry = qt.QLineEdit(self)
self.form_layout.addRow(
self.first_name_label,
self.first_name_entry,
)
def create_last_name_input(self):
self.last_name_label = qt.QLabel("Last Name:")
self.last_name_entry = qt.QLineEdit(self)
self.form_layout.addRow(
self.last_name_label,
self.last_name_entry,
)
def create_submit_button(self):
self.submit_button = qt.QPushButton(self)
self.submit_button.setText("Add Student")
self.submit_button.clicked.connect(self.submit)
self.form_layout.addRow(self.submit_button)
def submit(self):
default_color = "color: black"
error_color = "color: red"
date_color = default_color
first_name_color = default_color
last_name_color = default_color
#really should validate if this is a date, not just if it is empty
if (self.date_entry.text() == ""):
date_color = error_color
if (self.first_name_entry.text() == ""):
first_name_color = error_color
if (self.last_name_entry.text() == ""):
last_name_color = error_color
self.date_label.setStyleSheet(date_color)
self.first_name_label.setStyleSheet(first_name_color)
self.last_name_label.setStyleSheet(last_name_color)
app = qt.QApplication(sys.argv)
window = MyApp()
window.show()
sys.exit(app.exec())
import sys
from PyQt5 import QtCore, QtWidgets
class MyLineEdit(QtWidgets.QLineEdit):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
# the "invalid" label *has* to be a child of this QLineEdit
self.invalidLabel = QtWidgets.QLabel('*', self)
self.invalidLabel.setStyleSheet('color: red;')
spacing = 2
# get default margins and re-set them accordingly
self.leftMargin, self.topMargin, self.rightMargin, self.bottomMargin = self.getContentsMargins()
self.rightMargin += self.invalidLabel.minimumSizeHint().width() + spacing
self.setContentsMargins(self.leftMargin, self.topMargin, self.rightMargin + spacing, self.bottomMargin)
self.textChanged.connect(self.setValid)
self.setValid(self.text())
def setValid(self, text):
self.invalidLabel.setVisible(not bool(text))
def isValid(self):
return bool(self.text())
def resizeEvent(self, event):
self.invalidLabel.setGeometry(self.width() - self.rightMargin, self.topMargin,
self.invalidLabel.minimumSizeHint().width(), self.height() - self.topMargin - self.bottomMargin)
class MyApp(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
self.setup()
def setup(self):
self.form = QtWidgets.QGroupBox("Add Student")
self.setCentralWidget(self.form)
self.formLayout = QtWidgets.QFormLayout()
self.form.setLayout(self.formLayout)
self.fields = []
self.create_field('Starting Date:', defaultValue=QtCore.QDate.currentDate().toString('MM/dd/yyyy'))
self.create_field('First Name:')
self.create_field('Last Name:')
self.create_submit_button()
def create_field(self, label, defaultValue=''):
field = MyLineEdit(defaultValue)
self.fields.append(field)
field.defaultValue = field.text()
self.formLayout.addRow(label, field)
field.textChanged.connect(self.checkFields)
def create_submit_button(self):
self.submitButton = QtWidgets.QPushButton('Add Student')
self.formLayout.addRow(self.submitButton)
self.submitButton.clicked.connect(self.submit)
self.submitButton.setEnabled(False)
self.checkFields()
def checkFields(self):
self.submitButton.setEnabled(all(field.isValid() for field in self.fields))
def submit(self):
# doSomething([field.text() for field in self.fields)
for field in self.fields:
field.setText(field.defaultValue)
app = QtWidgets.QApplication(sys.argv)
w = MyApp()
w.show()
sys.exit(app.exec_())