如何使用flask desktop创建新窗口

GUI创建一个无限循环,以防qt(pyqt4、pyqt5和pyside)通过函数执行 exec_() ,Flask也需要相同的原因,为什么两者不能在同一个线程中共存,因此我们为Flask创建了一个新线程。

在这个线程中,我们将通过信号将数据发送到主线程,主线程负责显示数据。

以下代码实现了上述功能。

from flask import Flask
from PySide import QtCore, QtGui, QtDeclarative

import sys

app = Flask(__name__)

@app.route('/')
def main():
    w = FlaskThread._single
    date = QtCore.QDateTime.currentDateTime()
    w.signal.emit("date: {} function: {}".format(date.toString("dd.MM.yyyy hh:mm:ss.zzz"), "main"))
    return "Hello world!"

class FlaskThread(QtCore.QThread):
    signal = QtCore.Signal(str)
    _single = None
    def __init__(self, application):
        QtCore.QThread.__init__(self)
        if FlaskThread._single:
            raise FlaskThread._single
        FlaskThread._single = self
        self.application = application

    def __del__(self):
        self.wait()

    def run(self):
        self.application.run()


def provide_GUI_for(application):
    qtapp = QtGui.QApplication(sys.argv)

    webapp = FlaskThread(application)

    view = QtDeclarative.QDeclarativeView()
    url = QtCore.QUrl('view.qml')
    view.setSource(url)
    root = view.rootObject()
    webapp.signal.connect(lambda text: root.setProperty("text", text))

    view.show()

    qtapp.aboutToQuit.connect(webapp.terminate)
    QtGui.QApplication.setQuitOnLastWindowClosed(False)

    webapp.start()

    return qtapp.exec_()


if __name__ == '__main__':
    sys.exit(provide_GUI_for(app))

视图.qml

import QtQuick 1.0

Text { 
    width: 320
    height: 240
    text: "nothing"
    color: "red"
    horizontalAlignment: Text.AlignHCenter
}