Implementing a Registration Page with PyQt5 for a Library Management System
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The registration interface includes fields for usernmae, password, and a registration button. The logic layer validates input upon clicking the register button, checking for existing accounts and ensuring username and password meet requirements.
A clean UI design can be implemented using QTCreator's drag-and-drop features and converted to Python code, or directly coded. The interface consists of a central label, four labels with input boxes for registration details, and a register button.
def setup_interface(self):
header_font = QFont()
header_font.setPixelSize(18)
input_font = QFont()
input_font.setPixelSize(16)
main_layout = QVBoxLayout()
self.setLayout(main_layout)
registration_label = QLabel("Register")
registration_label.setFixedHeight(100)
registration_label.setAlignment(Qt.AlignCenter)
registration_label.setFont(header_font)
main_layout.addWidget(registration_label, Qt.AlignHCenter)
form_layout = QFormLayout()
account_label = QLabel("Account:")
account_label.setFont(header_font)
self.account_input = QLineEdit()
self.account_input.setFixedWidth(180)
self.account_input.setFixedHeight(32)
self.account_input.setFont(input_font)
self.account_input.setMaxLength(10)
form_layout.addRow(account_label, self.account_input)
name_label = QLabel("Name:")
name_label.setFont(header_font)
self.name_input = QLineEdit()
self.name_input.setFixedHeight(32)
self.name_input.setFixedWidth(180)
self.name_input.setFont(input_font)
self.name_input.setMaxLength(10)
form_layout.addRow(name_label, self.name_input)
password_label = QLabel("Password:")
password_label.setFont(header_font)
self.password_input = QLineEdit()
self.password_input.setFixedWidth(180)
self.password_input.setFixedHeight(32)
self.password_input.setFont(input_font)
self.password_input.setEchoMode(QLineEdit.PasswordEchoOnEdit)
self.password_input.setMaxLength(16)
form_layout.addRow(password_label, self.password_input)
confirm_label = QLabel("Confirm Password:")
confirm_label.setFont(header_font)
self.confirm_input = QLineEdit()
self.confirm_input.setFixedWidth(180)
self.confirm_input.setFixedHeight(32)
self.confirm_input.setFont(input_font)
self.confirm_input.setEchoMode(QLineEdit.PasswordEchoOnEdit)
self.confirm_input.setMaxLength(16)
form_layout.addRow(confirm_label, self.confirm_input)
self.register_btn = QPushButton("Register")
self.register_btn.setFixedWidth(120)
self.register_btn.setFixedHeight(30)
self.register_btn.setFont(header_font)
form_layout.addRow("", self.register_btn)
form_widget = QWidget()
form_widget.setLayout(form_layout)
form_widget.setFixedHeight(250)
form_widget.setFixedWidth(300)
horizontal_layout = QHBoxLayout()
horizontal_layout.addWidget(form_widget, Qt.AlignCenter)
container_widget = QWidget()
container_widget.setLayout(horizontal_layout)
main_layout.addWidget(container_widget, Qt.AlignHCenter)
account_validator = QRegExpValidator(self)
account_validator.setRegExp(QRegExp("user[0-9]{8}"))
self.account_input.setValidator(account_validator)
password_validator = QRegExpValidator(self)
password_validator.setRegExp(QRegExp("[a-zA-Z0-9]+$"))
self.password_input.setValidator(password_validator)
self.confirm_input.setValidator(password_validator)
During program initialization, the database is loaded and the UI interface is set up.
def __init__(self):
super().__init__()
self.resize(900, 600)
self.setWindowTitle("Library Management System Registration")
self.setup_interface()
self.user_manager = UserDbManager()
When the register button is clicked, a signal triggers the registration function to handle the event.
def process_registration(self):
account = self.account_input.text()
name = self.name_input.text()
password = self.password_input.text()
confirm = self.confirm_input.text()
if not account or not name or not password or not confirm:
QMessageBox.warning(self, "Warning", "All fields must be completed.", QMessageBox.Yes)
return
if password != confirm:
QMessageBox.warning(self, "Warning", "Passwords do not match.", QMessageBox.Yes)
return
hasher = hashlib.md5()
hasher.update(password.encode('utf-8'))
encrypted_password = hasher.hexdigest()
existing_user = self.user_manager.query_by_account(account)
if existing_user:
QMessageBox.warning(self, "Warning", "Account already exists.", QMessageBox.Yes)
return
self.user_manager.add_user(account, name, encrypted_password)
if self.user_manager.query_by_account(account):
QMessageBox.information(self, "Success", "Registration completed successfully.", QMessageBox.Yes)
self.registration_signal.emit(account)
else:
QMessageBox.warning(self, "Error", "Registration failed. Please try again.", QMessageBox.Yes)
This code can run independently. To integrate with other applications, modify the database operations in the registration function accordingly.
Complete program:
SignUp.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
import hashlib
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import qdarkstyle
from db.userInfoManager import UserDbManager
class RegistrationWidget(QWidget):
registration_signal = pyqtSignal(str)
def __init__(self):
super().__init__()
self.resize(900, 600)
self.setWindowTitle("Library Management System Registration")
self.setup_interface()
self.user_manager = UserDbManager()
def setup_interface(self):
header_font = QFont()
header_font.setPixelSize(18)
input_font = QFont()
input_font.setPixelSize(16)
main_layout = QVBoxLayout()
self.setLayout(main_layout)
registration_label = QLabel("Register")
registration_label.setFixedHeight(100)
registration_label.setAlignment(Qt.AlignCenter)
registration_label.setFont(header_font)
main_layout.addWidget(registration_label, Qt.AlignHCenter)
form_layout = QFormLayout()
account_label = QLabel("Account:")
account_label.setFont(header_font)
self.account_input = QLineEdit()
self.account_input.setFixedWidth(180)
self.account_input.setFixedHeight(32)
self.account_input.setFont(input_font)
self.account_input.setMaxLength(10)
form_layout.addRow(account_label, self.account_input)
name_label = QLabel("Name:")
name_label.setFont(header_font)
self.name_input = QLineEdit()
self.name_input.setFixedHeight(32)
self.name_input.setFixedWidth(180)
self.name_input.setFont(input_font)
self.name_input.setMaxLength(10)
form_layout.addRow(name_label, self.name_input)
password_label = QLabel("Password:")
password_label.setFont(header_font)
self.password_input = QLineEdit()
self.password_input.setFixedWidth(180)
self.password_input.setFixedHeight(32)
self.password_input.setFont(input_font)
self.password_input.setEchoMode(QLineEdit.PasswordEchoOnEdit)
self.password_input.setMaxLength(16)
form_layout.addRow(password_label, self.password_input)
confirm_label = QLabel("Confirm Password:")
confirm_label.setFont(header_font)
self.confirm_input = QLineEdit()
self.confirm_input.setFixedWidth(180)
self.confirm_input.setFixedHeight(32)
self.confirm_input.setFont(input_font)
self.confirm_input.setEchoMode(QLineEdit.PasswordEchoOnEdit)
self.confirm_input.setMaxLength(16)
form_layout.addRow(confirm_label, self.confirm_input)
self.register_btn = QPushButton("Register")
self.register_btn.setFixedWidth(120)
self.register_btn.setFixedHeight(30)
self.register_btn.setFont(header_font)
form_layout.addRow("", self.register_btn)
form_widget = QWidget()
form_widget.setLayout(form_layout)
form_widget.setFixedHeight(250)
form_widget.setFixedWidth(300)
horizontal_layout = QHBoxLayout()
horizontal_layout.addWidget(form_widget, Qt.AlignCenter)
container_widget = QWidget()
container_widget.setLayout(horizontal_layout)
main_layout.addWidget(container_widget, Qt.AlignHCenter)
account_validator = QRegExpValidator(self)
account_validator.setRegExp(QRegExp("user[0-9]{8}"))
self.account_input.setValidator(account_validator)
password_validator = QRegExpValidator(self)
password_validator.setRegExp(QRegExp("[a-zA-Z0-9]+$"))
self.password_input.setValidator(password_validator)
self.confirm_input.setValidator(password_validator)
self.register_btn.clicked.connect(self.process_registration)
self.account_input.returnPressed.connect(self.process_registration)
self.name_input.returnPressed.connect(self.process_registration)
self.password_input.returnPressed.connect(self.process_registration)
self.confirm_input.returnPressed.connect(self.process_registration)
def process_registration(self):
account = self.account_input.text()
name = self.name_input.text()
password = self.password_input.text()
confirm = self.confirm_input.text()
if not account or not name or not password or not confirm:
QMessageBox.warning(self, "Warning", "All fields must be completed.", QMessageBox.Yes)
return
if password != confirm:
QMessageBox.warning(self, "Warning", "Passwords do not match.", QMessageBox.Yes)
return
hasher = hashlib.md5()
hasher.update(password.encode('utf-8'))
encrypted_password = hasher.hexdigest()
existing_user = self.user_manager.query_by_account(account)
if existing_user:
QMessageBox.warning(self, "Warning", "Account already exists.", QMessageBox.Yes)
return
self.user_manager.add_user(account, name, encrypted_password)
if self.user_manager.query_by_account(account):
QMessageBox.information(self, "Success", "Registration completed successfully.", QMessageBox.Yes)
self.registration_signal.emit(account)
else:
QMessageBox.warning(self, "Error", "Registration failed. Please try again.", QMessageBox.Yes)
if __name__ == "__main__":
app = QApplication(sys.argv)
app.setStyleSheet(qdarkstyle.load_stylesheet_pyqt5())
main_window = RegistrationWidget()
main_window.show()
sys.exit(app.exec_())
