144 lines
4 KiB
Python
144 lines
4 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Created on 2019年9月18日
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@author: Irony
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@site: https://pyqt.site , https://github.com/PyQt5
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@email: 892768447@qq.com
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@file: QtQuick.Signals
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@description: 信号槽
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"""
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import sys
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from time import time
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try:
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from PyQt5.QtCore import QCoreApplication, Qt, pyqtSlot, pyqtSignal, QTimer
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from PyQt5.QtQml import QQmlApplicationEngine
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from PyQt5.QtWidgets import QApplication, QMessageBox, QWidget, QVBoxLayout, \
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QPushButton, QTextBrowser
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except ImportError:
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from PySide2.QtCore import QCoreApplication, Qt, Slot as pyqtSlot, Signal as pyqtSignal, QTimer
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from PySide2.QtQml import QQmlApplicationEngine
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from PySide2.QtWidgets import QApplication, QMessageBox, QWidget, QVBoxLayout, \
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QPushButton, QTextBrowser
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QML = """import QtQuick 2.0
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import QtQuick.Controls 1.6
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import QtQuick.Layouts 1.3
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ApplicationWindow {
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visible: true
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width: 400
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height: 400
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id: root
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title: "editor"
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// 定义信号槽
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signal valueChanged(int value)
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Component.onCompleted: {
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// 绑定信号槽到python中的函数
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valueChanged.connect(_Window.onValueChanged)
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// 绑定python中的信号到qml中的函数
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_Window.timerSignal.connect(appendText)
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}
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function appendText(text) {
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// 定义添加文字函数
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textArea.append(text)
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}
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ColumnLayout {
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id: columnLayout
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anchors.fill: parent
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Button {
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id: button
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text: qsTr("Button")
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Layout.fillWidth: true
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onClicked: {
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// 点击按钮调用python中的函数并得到返回值
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var ret = _Window.testSlot("Button")
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textArea.append("我调用了testSlot函数得到返回值: " + ret)
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}
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}
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Slider {
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id: sliderHorizontal
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Layout.fillWidth: true
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stepSize: 1
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minimumValue: 0
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maximumValue: 100
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// 拉动条值改变时发送信号
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onValueChanged: root.valueChanged(value)
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}
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TextArea {
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id: textArea
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Layout.fillWidth: true
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}
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}
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}
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"""
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class Window(QWidget):
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# 定义一个时间信号
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timerSignal = pyqtSignal(str)
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def __init__(self, *args, **kwargs):
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super(Window, self).__init__(*args, **kwargs)
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layout = QVBoxLayout(self)
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layout.addWidget(QPushButton('Python调用qml中的函数',
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self, clicked=self.callQmlFunc))
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self.resultView = QTextBrowser(self)
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layout.addWidget(self.resultView)
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self._timer = QTimer(self, timeout=self.onTimeout)
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self._timer.start(2000)
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def onTimeout(self):
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# 定时器发送信号通知qml
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self.timerSignal.emit('定时器发来:' + str(time()))
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def callQmlFunc(self):
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# 主动调用qml中的appendText函数
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engine.rootObjects()[0].appendText('我是被Python调用了')
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@pyqtSlot(int)
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def onValueChanged(self, value):
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# qml中的自定义信号valueChanged所绑定的槽函数
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self.resultView.append('拉动条值: %s' % value)
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@pyqtSlot(str, result=str) # 可以获取返回值
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def testSlot(self, name):
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# 被qml调用的函数
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self.resultView.append('我被主动调用: %s' % name)
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return str(len(name))
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if __name__ == '__main__':
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try:
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QCoreApplication.setAttribute(Qt.AA_EnableHighDpiScaling)
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except:
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pass
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app = QApplication(sys.argv)
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# 测试界面
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w = Window()
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w.resize(400, 400)
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w.show()
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w.move(400, 400)
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engine = QQmlApplicationEngine()
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# 提供一个沟通的对象_Window，必须是要继承QObject的类
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engine.rootContext().setContextProperty('_Window', w)
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engine.objectCreated.connect(
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lambda obj, _: QMessageBox.critical(None, '错误', '运行失败，请检查') if not obj else 0)
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engine.loadData(QML.encode())
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sys.exit(app.exec_())
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