Pyqt5 从 QtWebChannel 移动窗口

Posted 2023-02-16

【中文标题】Pyqt5 从 QtWebChannel 移动窗口

【英文标题】：Pyqt5 Move window from QtWebChannel

【发布时间】：2019-11-22 19:10:01

【问题描述】：

我正在尝试使 mousePressEvent 和 mouseMoveEvent 事件工作以从 QtWebChannel 移动我的应用程序窗口。

我正在使用 self.setWindowFlags (QtCore.Qt.FramelessWindowHint) 删除窗口标志并使用带有 html、css 和 js 的自定义标志。

在 html 中，我有一个 id 为“header”的 div，它具有自定义窗口标志，我想按住鼠标左键，可以像传统窗口标志一样拖动窗口。

关闭、最小化和最大化按钮在使用后端单击时已经具有各自的功能，但我在创建允许从<div id="header"> . . . </ div > 移动窗口的功能时遇到问题。

如何在 QtWebChannel 中运行 mousePressEvent 和 mouseMoveEvent 事件来移动窗口并模拟传统的窗口标志？

from PyQt5 import QtCore, QtGui, QtWidgets, QtWebEngineWidgets, QtWebChannel
from PyQt5.QtCore import QPoint

class Backend(QtCore.QObject):
    valueChanged = QtCore.pyqtSignal(str)

    def __init__(self, parent=None):
        super().__init__(parent)
        self._value = ""

    @QtCore.pyqtProperty(str)
    def value(self):
        return self._value

    @value.setter
    def value(self, v):
        self._value = v
        self.valueChanged.emit(v)

class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.webEngineView = QtWebEngineWidgets.QWebEngineView()
        self.setWindowFlags(QtCore.Qt.FramelessWindowHint)
        self.setAttribute(QtCore.Qt.WA_TranslucentBackground)
        self.resize(650, 610)
        self.setWindowOpacity(0.99)
        icon = QtGui.QIcon()
        icon.addPixmap(QtGui.QPixmap("favicon.ico"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.setWindowIcon(icon)
        lay = QtWidgets.QVBoxLayout(self)
        lay.setContentsMargins(0, 0, 0, 0)
        lay.addWidget(self.webEngineView)
        backend = Backend(self)
        backend.valueChanged.connect(self.foo_function)
        self.channel = QtWebChannel.QWebChannel()
        self.channel.registerObject("backend", backend)
        self.webEngineView.page().setWebChannel(self.channel)
        path = "http://localhost"
        self.webEngineView.setUrl(QtCore.QUrl(path))

    @QtCore.pyqtSlot(str)
    def foo_function(self, value):
        print("JS:", value)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

片段html代码

<div id="header" style="top: 0;" class="header">
    <button ondblclick="$('#div_console').fadeIn('fast')" class="ui-btn modales" id="btn_title" value="title" title="Bankus"><i style="color:#007bff" class="fas fa-eye"></i></button>
    <span id="title_text">Bankus 1.0</span>
    <button title="Cerrar" id="btn_exit" value="exit" onclick="json($(this))" class="ui-btn closee modales"><svg viewBox="0 0 10 10"><polygon points="10.2,0.7 9.5,0 5.1,4.4 0.7,0 0,0.7 4.4,5.1 0,9.5 0.7,10.2 5.1,5.8 9.5,10.2 10.2,9.5 5.8,5.1" /></svg></button>
    <button title="Maximizar" id="btn_maxi" value="maxi" onclick="json($(this))" class="ui-btn maximize modales"><svg viewBox="0 0 10 10"><path d="M0,0v10h10V0H0z M9,9H1V1h8V9z" /></svg></button>
    <button title="Retaurar" id="btn_maxi" value="norm" onclick="json($(this))" class="ui-btn maximize modales invisi"><svg viewBox="0 0 10.2 10.1"><path d="M2.1,0v2H0v8.1h8.2v-2h2V0H2.1z M7.2,9.2H1.1V3h6.1V9.2z M9.2,7.1h-1V2H3.1V1h6.1V7.1z" /></svg></button>
    <button title="Minimizar" id="btn_mini" value="mini" onclick="json($(this))" class="ui-btn minimize modales"><svg x="0px" y="0px" viewBox="0 0 10.2 1"><rect x="0" y="50%"   /></svg></button>
    <button title="Captura de pantalla" id="btn_capt" value="capt" onclick="json($(this))" class="ui-btn modales"><svg id="capture" xmlns="http://www.w3.org/2000/svg" data-name="Layer 1" viewBox="0 0 64 64"><polygon fill="none" stroke="#010101" stroke-miterlimit="10" stroke- points="47 12 42.88 8 21.12 8 17 12 2 12 2 56 62 56 62 12 47 12"/><circle cx="32" cy="34" r="14" fill="none" stroke="#010101" stroke-miterlimit="10" stroke-/><path fill="none" stroke="#010101" stroke-miterlimit="10" stroke- d="M10,21h0a1,1,0,0,1-1-1H9a1,1,0,0,1,1-1h0a1,1,0,0,1,1,1h0A1,1,0,0,1,10,21Z"/></svg></button>
</div>

github上的完整html代码：https://github.com/onimac92/bankus/blob/master/index.html

代码最小的html：

<!DOCTYPE html>
<html>
<head>
<style type="text/css">

body 
    margin: 0;


#header 
    width: 100%;
    height: 30px;
    background: red;
    position: absolute;


</style>
</head>
<body>

<div id="header"></div>

</body>
</html>

【问题讨论】：

分享你的 html...

github.com/onimac92/bankus/blob/master/index.html

我没有看到任何 id 为“header”的 div，它也不会生成您显示的内容。

我已经更正了，我已经添加了 div id header

全码pythongithub.com/onimac92/bankus/blob/master/bankus.py

【参考方案1】：

您必须检测鼠标事件，将它们发送到 python 并实现窗口移动：

ma​​in.py

import json
import os

from PyQt5 import QtCore, QtGui, QtWidgets, QtWebEngineWidgets, QtWebChannel


class WindowManager(QtCore.QObject):
    def __init__(self, window, parent=None):
        super().__init__(parent)
        self._window = window

        self._drag_position = QtCore.QPoint()

    @property
    def window(self):
        return self._window

    @QtCore.pyqtSlot(str)
    def mousePressEvent(self, string_event):
        event = json.loads(string_event)
        if event["which"] == 1:
            gp = QtCore.QPoint(event["screenX"], event["screenY"])
            self.drag_position = gp - self.window.frameGeometry().topLeft()

    @QtCore.pyqtSlot(str)
    def mouseMoveEvent(self, string_event):
        event = json.loads(string_event)
        if event["which"] == 1:
            gp = QtCore.QPoint(event["screenX"], event["screenY"])
            self.window.move(gp - self.drag_position)


class WebEngineView(QtWebEngineWidgets.QWebEngineView):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setWindowFlags(QtCore.Qt.FramelessWindowHint)
        self.setAttribute(QtCore.Qt.WA_TranslucentBackground)
        self.setWindowOpacity(0.99)

        self.resize(640, 480)

        icon = QtGui.QIcon()
        icon.addPixmap(
            QtGui.QPixmap("favicon.ico"), QtGui.QIcon.Normal, QtGui.QIcon.Off
        )
        self.setWindowIcon(icon)

        self.window_manager = WindowManager(self.window())
        self.channel = QtWebChannel.QWebChannel()
        self.channel.registerObject("window_manager", self.window_manager)
        self.page().setWebChannel(self.channel)

        current_dir = os.path.dirname(os.path.realpath(__file__))
        self.load(QtCore.QUrl.fromLocalFile(os.path.join(current_dir, "index.html")))


if __name__ == "__main__":
    import sys

    sys.argv.append("--remote-debugging-port=8000")

    app = QtWidgets.QApplication(sys.argv)
    w = WebEngineView()
    w.show()
    sys.exit(app.exec_())

index.html

<!DOCTYPE html>
<html>
<head>
    <script src="qrc:///qtwebchannel/qwebchannel.js"></script>
    <style type="text/css">

    body 
        margin: 0;
    

    #header 
        width: 100%;
        height: 30px;
        background: red;
        position: absolute;
    

    </style>
</head>
<body>
    <div id="header"></div>

    <script type="text/javascript">

        function event_to_string(event)
            return JSON.stringify("screenX": event.screenX, "screenY": event.screenY, "which": event.which)
        
        var window_manager = null;
        if (typeof QWebChannel !== "undefined") 
            new QWebChannel(qt.webChannelTransport, function (channel) 
                window_manager = channel.objects.window_manager;
                var header = document.getElementById("header")
                header.addEventListener('mousedown', function(event)
                    window_manager.mousePressEvent(event_to_string(event))
                );
                header.addEventListener('mousemove', function(event)
                    window_manager.mouseMoveEvent(event_to_string(event))
                );
            );
        
    </script>
</body>

【讨论】：

Ya implementé el código, funciona perfectamente, aunque cuando hago un movimiento rápido, no me calcula el valor correctamente y no se mueve。 Intentare mejorar y adaptar el código。 Le agradezco!