Question

我想在文本区域中将Python中的字符串内容（多行）发送到QML应用程序。所以我该怎么做。

test.py

def send_file(file_content)
    pass // send file to QML text area

test.qml

Window {
    id: mainWindow
    property alias text: textArea.text

    function read_file(){
        mainWindow.text = send_file(file_content) //Strings from python
    }

    TextArea{
         id: textArea
    }
}

Answer 1

如果您要将信息从Python发送到QML，则必须创建一个继承自QObject且具有q-property的类来存储该值，然后导出该类的对象为QML setContextProperty()，QML侧执行绑定，如下所示：

<强> main.py

import sys

from PyQt5.QtCore import QObject, pyqtSignal, pyqtProperty, QUrl
from PyQt5.QtGui import QGuiApplication
from PyQt5.QtQml import QQmlApplicationEngine


class Helper(QObject):
    textChanged = pyqtSignal()

    def __init__(self, parent=None):
        QObject.__init__(self, parent)
        self._text = ""

    @pyqtProperty(str, notify=textChanged)
    def text(self):
        return self._text

    @text.setter
    def text(self, v):
        if self._text == v:
            return
        self._text = v
        self.textChanged.emit()

    def send_file(self, file_content):
        self.text = file_content

if __name__ == "__main__":
    app = QGuiApplication(sys.argv)

    engine = QQmlApplicationEngine()
    helper = Helper()
    engine.rootContext().setContextProperty("helper", helper)
    engine.load(QUrl.fromLocalFile('main.qml'))
    if not engine.rootObjects():
        sys.exit(-1)

    helper.send_file("Lorem ipsum dolor sit amet, consectetur adipiscing elit. In ornare magna felis. Nulla justo ipsum, finibus eu nibh quis, iaculis malesuada lorem. Phasellus et lacus malesuada, aliquam enim condimentum, efficitur sapien. Sed ultricies egestas massa, nec sodales neque mattis et. Praesent euismod pretium hendrerit. Maecenas non porttitor velit, non scelerisque quam. Phasellus at diam vel enim venenatis vulputate sed a nisl. Sed erat nunc, maximus varius justo vitae, vehicula porttitor enim. Maecenas vitae sem odio. Nunc interdum sapien vitae magna tempus, nec laoreet elit placerat. Nullam cursus metus facilisis pulvinar auctor.")
    sys.exit(app.exec_())

<强> main.qml

import QtQuick 2.10
import QtQuick.Window 2.2
import QtQuick.Controls 1.4

Window {
    id: mainWindow
    visible: true

    TextArea{
         id: textArea
         anchors.fill: parent
         text: helper.text
    }
}

如何将文本文件（或字符串到QML中的textArea）从python发送到QML应用程序？

1 个答案: