如何使用 Qt 和 Flask 开发一个本地应用？

约 449 字大约 2 分钟

前后端

2021-10-15

项目结构

root

dist# 文件夹内为前端内容, 其中包括前端的 HTML, CSS, JS 等内容

css

fonts

img

favicon.ico

index.html

pyside_flask_desk

__init__.py# 创建 Qt 窗口, 并使用线程启动 Flask

app.py

run.py# 程序主入口

代码

Qt-Flask-App

root

run.py

pyside_flask_desk

__init__.py

app.py

root/run.py
#! -*- coding:utf-8 -*-
import sys
import os
from app import *
from PySide2.QtCore import QFileInfo
from pyside_flask_desk import init_gui

sys.path.append((os.path.dirname(os.path.abspath(os.path.dirname(__file__)))).replace("\\", "/"))


if __name__ == '__main__':
    root = QFileInfo(__file__).absolutePath()
    init_gui(app, port=5000, window_title="Qt-Flask-App", icon=root + "/dist/favicon.ico") # icon 的路径须使用绝对路径
root/pyside_flask_desk/__init__.py
import sys
from PySide2 import QtCore, QtWidgets, QtGui, QtWebEngineWidgets
import socket

class ApplicationThread(QtCore.QThread):
    def __init__(self, application, port=5000):
        super(ApplicationThread, self).__init__()
        self.application = application
        self.port = port

    def __del__(self):
        self.wait()

    def run(self):
        self.application.run(port=self.port, threaded=True)


class WebPage(QtWebEngineWidgets.QWebEnginePage):
    def __init__(self, root_url):
        super(WebPage, self).__init__()
        self.root_url = root_url

    def home(self):
        self.load(QtCore.QUrl(self.root_url))


def init_gui(application, icon, port, width=800, height=600,
             window_title="PyFladesk", argv=None):
    if argv is None:
        argv = sys.argv

    # 创建主窗口框架
    qtapp = QtWidgets.QApplication(argv)

    # 线程启动 flask
    webapp = ApplicationThread(application, port)
    webapp.start()
    # connect function: 关闭 qt app 窗口时, 调用 flask 的终止
    qtapp.aboutToQuit.connect(webapp.terminate)

    # 创建主窗口, 并设置大小, 标题, icon
    window = QtWidgets.QMainWindow()
    window.resize(width, height)
    window.setWindowTitle(window_title)
    window.setWindowIcon(QtGui.QIcon(icon))

    # 创建 WebEngineView 并套入主窗口
    webView = QtWebEngineWidgets.QWebEngineView(window)
    window.setCentralWidget(webView)

    # 通过 home() 加载 url, 并将 page 放入 view
    page = WebPage('http://localhost:{}'.format(port))
    page.home()
    webView.setPage(page)

    # 显示窗口
    window.show()
    return qtapp.exec_()
root/app.py
from flask import Flask, render_template

# 其中 static_url_path='' 不可缺少, 是由于前端 HTML 中将资源加载的目录写死为根目录
# static_folder='dist', template_folder='dist' 根据具体项目的实际情况写 HTML, CSS 等文件在的文件夹即可
# 该文件为 Flask 接口主文件

app = Flask(__name__, static_url_path='', static_folder='dist', template_folder='dist')

app.config['EXPLAIN_TEMPLATE_LOADING'] = True

# 路由
@app.route('/')
def greet():
    return render_template('index.html')