python - 使用 PyQt5 正确凭据后“重定向”用户

Question

我制作了一个 Django API，如果用户成功登录，它会返回。我使用该 API 结果在 PyQt 中登录用户。我的代码如下：

import json
import sys

import requests
from PyQt5.QtWidgets import QMainWindow, QApplication, QPushButton, QLineEdit, QMessageBox, QLabel
from PyQt5.QtCore import pyqtSlot

from PyQtProject.request_login import querystring, headers


class App(QMainWindow):

    def __init__(self):
        super().__init__()
        self.title = 'Login na aplicação'
        self.left = 600
        self.top = 400
        self.width = 380
        self.height = 200
        self.username = None
        self.password = None
        self.button = None

    def __call__(self, *args, **kwargs):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)

        # Create an username textbox
        self.username = QLineEdit(self)
        self.username.move(20, 20)
        self.username.resize(280, 40)
        self.username.setPlaceholderText('Usuário')

        # Create a password textbox
        self.password = QLineEdit(self)
        self.password.setEchoMode(QLineEdit.Password)
        self.password.move(20, 80)
        self.password.resize(280, 40)
        self.password.setPlaceholderText('Senha')

        # Create a button in the window
        self.button = QPushButton('Login', self)
        self.button.move(20, 140)

        # connect button to function on_click
        self.button.clicked.connect(self.on_click)
        self.show()

    @pyqtSlot()
    def on_click(self):
        username = self.username.text()
        password = self.password.text()

        querystring.update({'username': username, 'password': password})

        url = "http://localhost:8000/login_api/"

        response = requests.request("GET", url, headers=headers, params=querystring)

        result = json.loads(response.content)[0]['message']
        if result:
            pass
        else:
            QMessageBox.question(
                self, 'Erro', "Usuário não autenticado!", QMessageBox.Ok, QMessageBox.Ok
            )
            self.username.setText("")
            self.password.setText("")

    def upload_file_page(self):
        pass


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    ex()
    sys.exit(app.exec_())

我需要将用户“重定向”到 PyQt 中的上传文件“页面”。

我最初的想法是清除整个屏幕并用新的项目替换以前的项目。

我怎样才能做到这一点？

** “重定向”是指我想关闭前一个窗口并打开另一个窗口。

标签： pythondjangopyqt5

Answer 1

在这种情况下，最好有一个类来处理类似于 Django 控制器的“页面”逻辑，以便让您的特定逻辑能够显示或隐藏页面。

另一方面，在您的情况下，请求是针对本地 url，但考虑到它也可以是远程 url，因此可能需要很长时间，因此它会阻塞 GUI，为避免这种情况，我已经实现了一个将居住的工作人员另一个线程避免冻结。

import sys
from functools import partial
import json

import requests

from PyQt5.QtWidgets import (
    QApplication,
    QLabel,
    QLineEdit,
    QMessageBox,
    QPushButton,
    QVBoxLayout,
    QWidget,
)
from PyQt5.QtCore import pyqtSignal, pyqtSlot, QObject, Qt, QThread, QTimer

from PyQtProject.request_login import querystring, headers


class LoginPage(QWidget):
    send_credentials = pyqtSignal(str, str)

    def __init__(self):
        super().__init__()
        self.title = "Login na aplicação"
        self.init_ui()

    def init_ui(self):

        self.setWindowTitle(self.title)

        # Create an username textbox
        self.username = QLineEdit(placeholderText="Usuário")
        self.password = QLineEdit(echoMode=QLineEdit.Password, placeholderText="Senha")
        self.button = QPushButton("Login")

        self.username.setFixedHeight(40)
        self.password.setFixedHeight(40)
        self.setFixedSize(380, 200)

        lay = QVBoxLayout(self)
        lay.addWidget(self.username)
        lay.addWidget(self.password)
        lay.addWidget(self.button, alignment=Qt.AlignLeft)

        # connect button to function on_click
        self.button.clicked.connect(self.on_click)

    @pyqtSlot()
    def on_click(self):
        username = self.username.text()
        password = self.password.text()

        self.send_credentials.emit(username, password)

    @pyqtSlot()
    def failed(self):
        QMessageBox.question(
            self, "Erro", "Usuário não autenticado!", QMessageBox.Ok, QMessageBox.Ok
        )
        self.username.clear()
        self.password.clear()


class UploadFilePage(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        lay = QVBoxLayout(self)
        lay.addWidget(QLabel("UploadFilePage"))


class RequestsWorker(QObject):
    logged = pyqtSignal(bool)

    @pyqtSlot(str, str)
    def login_request(self, username, password):
        querystring.update({"username": username, "password": password})
        url = "http://localhost:8000/login_api/"
        response = requests.request("GET", url, headers=headers, params=querystring)
        result = json.loads(response.content)[0]["message"]
        self.logged.emit(bool(result))


class Controller(QObject):
    def __init__(self, parent=None):
        super().__init__(parent)

        thread = QThread(self)
        thread.start()

        self._requests_worker = RequestsWorker()
        self._requests_worker.logged.connect(self.onLogged)

        self._login_page = LoginPage()
        self._login_page.send_credentials.connect(self._requests_worker.login_request)
        self._login_page.show()

        self._upload_page = UploadFilePage()

    @pyqtSlot(bool)
    def onLogged(self, result):
        if result:
            self._login_page.close()
            self._upload_page.show()
        else:
            self._login_page.failed()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    controller = Controller()
    sys.exit(app.exec_())