3

我有一个使用 QWebChannel 创建谷歌地图实例的小部件。在 javascript 中实例化 QWebChannel 时会出现几个警告：

Property 'accessibleName'' of object 'MapWindow' has no notify signal and is not constant, value updates in HTML will be broken!
Property 'accessibleDescription'' of object 'MapWindow' has no notify signal and is not constant, value updates in HTML will be broken!
Property 'layoutDirection'' of object 'MapWindow' has no notify signal and is not constant, value updates in HTML will be broken!
Property 'autoFillBackground'' of object 'MapWindow' has no notify signal and is not constant, value updates in HTML will be broken!
Property 'styleSheet'' of object 'MapWindow' has no notify signal and is not constant, value updates in HTML will be broken!
Property 'locale'' of object 'MapWindow' has no notify signal and is not constant, value updates in HTML will be broken!
Property 'windowFilePath'' of object 'MapWindow' has no notify signal and is not constant, value updates in HTML will be broken!
Property 'inputMethodHints'' of object 'MapWindow' has no notify signal and is not constant, value updates in HTML will be broken!

var backend = null;
new QWebChannel(qt.webChannelTransport, function(channel) {
    backend = channel.objects.backend;
    backend.getRef(function(ref) {
        backend.getCenter(function(center) {
            backend.getPoints(function(points){
                map = new google.maps.Map(document.getElementById('map'), {
                   center: center[0],
                   zoom: 10
                 });
                 ...

self.mapView = QWebEngineView()
self.webchannel = QWebChannel(self.mapView)
self.mapView.page().setWebChannel(self.webchannel)
self.webchannel.registerObject('backend', self)
current_dir = os.path.dirname(os.path.realpath(__file__))
filename = os.path.join(current_dir, '.\Resources\index.html')
self.mapView.load(QUrl.fromLocalFile(filename))
4

1 回答 1

2

QWebChannel 将分析已注册对象的 q 属性，以验证它们是否具有关联的信号。在您的警告消息的情况下，我推断“self”是一个 QWidget，因此它有许多 q-properties，它们没有关联的信号表明错误。

鉴于上述情况，有两种解决方案：

  • 通过禁用 qInstallMessageHandler 使错误消息静音：
QtCore.qInstallMessageHandler(lambda *args: None)
  • 不要使用“self”作为后端，而是使用 QObject
class Backend(QObject):
    # getRef, getCenter, getPoints

self.backend = Backend(self)
self.webchannel.registerObject('backend', self.backend)
于 2019-11-18T01:53:20.963 回答