Python 发出信号后QML AppWindow未更新
我有一个小问题,让我花了一上午的大部分时间。我正试图根据pyQt使用地理编码器传入的本地坐标,在QML中绘制一个地图屏幕。我可以画地图,但一旦信号发出,地图似乎就不会更新。我对QML和信号/插槽比较陌生。任何帮助都将不胜感激 main.pyPython 发出信号后QML AppWindow未更新,python,python-3.x,pyqt,qml,pyqt5,Python,Python 3.x,Pyqt,Qml,Pyqt5,我有一个小问题,让我花了一上午的大部分时间。我正试图根据pyQt使用地理编码器传入的本地坐标,在QML中绘制一个地图屏幕。我可以画地图,但一旦信号发出,地图似乎就不会更新。我对QML和信号/插槽比较陌生。任何帮助都将不胜感激 main.py from PyQt5.QtGui import QGuiApplication from PyQt5.QtQml import QQmlApplicationEngine from PyQt5.QtCore import QObject, pyqtSigna
from PyQt5.QtGui import QGuiApplication
from PyQt5.QtQml import QQmlApplicationEngine
from PyQt5.QtCore import QObject, pyqtSignal, pyqtSlot
class Point(QObject):
def __init__(self, lat, lng):
QObject.__init__(self)
self.lat = lat
self.lng = lng
#Signal sending point
#Give the name of the argument through arguments=['lat', 'lng']
#Otherwise, it will not be possible to get it in QML
showCenter = pyqtSignal(float, float, arguments=['lat', 'lng'])
#Slot for emitting point
@pyqtSlot()
def emitPoint(self):
self.showCenter.emit(self.lat, self.lng)
if __name__ == "__main__":
import sys
import geocoder
#Create an instance of the application
app = QGuiApplication(sys.argv)
#Create a QML engine
engine = QQmlApplicationEngine()
#Create a Point object
g = geocoder.ip('me')
center_point = Point(g.latlng[0], g.latlng[1])
#And register it in the context of QML
engine.rootContext().setContextProperty("center_point", center_point)
#Load the qml file into the engine
engine.load("main.qml")
engine.quit.connect(app.quit)
sys.exit(app.exec_())
from PyQt5 import QtCore, QtGui, QtPositioning, QtQml
class PointObject(QtCore.QObject):
coordinateChanged = QtCore.pyqtSignal(QtPositioning.QGeoCoordinate)
def __init__(self, parent=None):
super(PointObject, self).__init__(parent)
self._coordinate = QtPositioning.QGeoCoordinate()
def getCoordinate(self):
return self._coordinate
def setCoordinate(self, coordinate):
if self._coordinate != coordinate:
self._coordinate = coordinate
self.coordinateChanged.emit(self._coordinate)
coordinate = QtCore.pyqtProperty(QtPositioning.QGeoCoordinate, fget=getCoordinate, fset=setCoordinate, notify=coordinateChanged)
if __name__ == "__main__":
import os
import sys
import geocoder
#Create an instance of the application
app = QtGui.QGuiApplication(sys.argv)
#Create a QML engine
engine = QtQml.QQmlApplicationEngine()
#Create a Point object
g = geocoder.ip('me')
center_point = PointObject()
center_point.setCoordinate(QtPositioning.QGeoCoordinate(*g.latlng))
#And register it in the context of QML
engine.rootContext().setContextProperty("center_point", center_point)
#Load the qml file into the engine
qml_path = os.path.join(os.path.dirname(__file__), "main.qml")
engine.load(QtCore.QUrl.fromLocalFile(qml_path))
if not engine.rootObjects():
sys.exit(-1)
engine.quit.connect(app.quit)
sys.exit(app.exec_())
main.qml
import QtQuick 2.5
import QtQml 2.0
import QtQuick.Controls 1.4
import QtQuick.Layouts 1.2
import QtPositioning 5.9
import QtLocation 5.9
ApplicationWindow {
visible: true
width: 640
height: 480
title: qsTr("Map Point demo")
color: "whitesmoke"
Plugin {
id: mapPlugin
name: "esri" //"mapboxgl" "osm" "esri"
}
Map {
id: map
anchors.fill: parent
plugin: mapPlugin
center: QtPositioning.coordinate(0.0, 0.0)
zoomLevel: 6
MapCircle {
id: dot
center: QtPositioning.coordinate(0.0, 0.0)
radius: 50
color: 'red'
}
Connections {
target: center_point
onEmitPoint: {
console.info("Point changed")
map.center = QtPositioning.coordinate(lat, lng)
dot.center = QtPositioning.coordinate(lat, lng)
}
}
}
Component.onCompleted: {
console.info("Signal Emitted")
center_point.emitPoint()
}
}
import QtQuick 2.5
import QtQml 2.0
import QtQuick.Controls 1.4
import QtQuick.Layouts 1.2
import QtPositioning 5.9
import QtLocation 5.9
ApplicationWindow {
visible: true
width: 640
height: 480
title: qsTr("Map Point demo")
color: "whitesmoke"
Plugin {
id: mapPlugin
name: "esri" //"mapboxgl" "osm" "esri"
}
Map {
id: map
anchors.fill: parent
plugin: mapPlugin
center: center_point.coordinate
zoomLevel: 6
MapCircle {
id: dot
center: center_point.coordinate
radius: 50
color: 'red'
}
}
}
使用连接时,如果目标信号被称为信号的名称,则必须使用信号的名称,在您的情况下,信号是showCenter,因此必须使用showCenter的名称:
Connections {
target: center_point
onShowCenter: { // <---
console.info("Point changed")
map.center = QtPositioning.coordinate(lat, lng)
dot.center = QtPositioning.coordinate(lat, lng)
}
}
main.qml
import QtQuick 2.5
import QtQml 2.0
import QtQuick.Controls 1.4
import QtQuick.Layouts 1.2
import QtPositioning 5.9
import QtLocation 5.9
ApplicationWindow {
visible: true
width: 640
height: 480
title: qsTr("Map Point demo")
color: "whitesmoke"
Plugin {
id: mapPlugin
name: "esri" //"mapboxgl" "osm" "esri"
}
Map {
id: map
anchors.fill: parent
plugin: mapPlugin
center: QtPositioning.coordinate(0.0, 0.0)
zoomLevel: 6
MapCircle {
id: dot
center: QtPositioning.coordinate(0.0, 0.0)
radius: 50
color: 'red'
}
Connections {
target: center_point
onEmitPoint: {
console.info("Point changed")
map.center = QtPositioning.coordinate(lat, lng)
dot.center = QtPositioning.coordinate(lat, lng)
}
}
}
Component.onCompleted: {
console.info("Signal Emitted")
center_point.emitPoint()
}
}
import QtQuick 2.5
import QtQml 2.0
import QtQuick.Controls 1.4
import QtQuick.Layouts 1.2
import QtPositioning 5.9
import QtLocation 5.9
ApplicationWindow {
visible: true
width: 640
height: 480
title: qsTr("Map Point demo")
color: "whitesmoke"
Plugin {
id: mapPlugin
name: "esri" //"mapboxgl" "osm" "esri"
}
Map {
id: map
anchors.fill: parent
plugin: mapPlugin
center: center_point.coordinate
zoomLevel: 6
MapCircle {
id: dot
center: center_point.coordinate
radius: 50
color: 'red'
}
}
}
谢谢,这两种方法都解决了这个问题。