PyQt/QtQuick/Signals.py

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2019-09-18 22:32:19 +08:00
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Created on 2019年9月18日
@author: Irony
@site: https://pyqt5.com https://github.com/892768447
@email: 892768447@qq.com
@file: QtQuick.Signals
@description: 信号槽
"""
import sys
from PyQt5.QtCore import QCoreApplication, Qt, pyqtSlot
from PyQt5.QtQml import QQmlApplicationEngine
from PyQt5.QtWidgets import QApplication, QMessageBox, QWidget, QVBoxLayout,\
QPushButton, QTextBrowser
__Author__ = 'Irony'
__Copyright__ = 'Copyright (c) 2019'
QML = """import QtQuick 2.0
import QtQuick.Controls 1.6
import QtQuick.Layouts 1.3
ApplicationWindow {
visible: true
width: 400
height: 400
id: root
title: "editor"
// 定义信号槽
signal valueChanged(int value)
Component.onCompleted: {
// 绑定信号槽到python中的函数
valueChanged.connect(_Window.onValueChanged);
}
function appendText(text) {
// 定义添加文字函数
textArea.append(text)
}
ColumnLayout {
id: columnLayout
anchors.fill: parent
Button {
id: button
text: qsTr("Button")
Layout.fillWidth: true
onClicked: {
// 点击按钮调用python中的函数并得到返回值
var ret = _Window.testSlot("Button")
textArea.append("我调用了testSlot函数得到返回值: " + ret)
}
}
Slider {
id: sliderHorizontal
Layout.fillWidth: true
stepSize: 1
minimumValue: 0
maximumValue: 100
// 拉动条值改变时发送信号
onValueChanged: root.valueChanged(value)
}
TextArea {
id: textArea
Layout.fillWidth: true
}
}
}
"""
class Window(QWidget):
def __init__(self, *args, **kwargs):
super(Window, self).__init__(*args, **kwargs)
layout = QVBoxLayout(self)
layout.addWidget(QPushButton('Python调用qml中的函数',
self, clicked=self.callQmlFunc))
self.resultView = QTextBrowser(self)
layout.addWidget(self.resultView)
def callQmlFunc(self):
# 主动调用qml中的appendText函数
engine.rootObjects()[0].appendText('我是被Python调用了')
@pyqtSlot(int)
def onValueChanged(self, value):
# qml中的自定义信号valueChanged所绑定的槽函数
self.resultView.append('拉动条值: %s' % value)
@pyqtSlot(str, result=str) # 可以获取返回值
def testSlot(self, name):
# 被qml调用的函数
self.resultView.append('我被主动调用: %s' % name)
return str(len(name))
if __name__ == '__main__':
try:
QCoreApplication.setAttribute(Qt.AA_EnableHighDpiScaling)
except:
pass
app = QApplication(sys.argv)
# 测试界面
w = Window()
w.resize(400, 400)
w.show()
w.move(400, 400)
engine = QQmlApplicationEngine()
# 提供一个沟通的对象_Window必须是要继承QObject的类
engine.rootContext().setContextProperty('_Window', w)
engine.objectCreated.connect(
lambda obj, _: QMessageBox.critical(None, '错误', '运行失败,请检查') if not obj else 0)
engine.loadData(QML.encode())
sys.exit(app.exec_())