[英]How to set values in qml using PySide2?
從 PySide2 我想將值寫入 qml。 該值動態變化。
對於此處的 PyQt5 示例: How to set values in qml using PyQt5?
主要.py:
import sys
from PySide2.QtCore import QObject, Signal, Property, QUrl, QTimer, QDateTime
from PySide2.QtGui import QGuiApplication
from PySide2.QtQml import QQmlApplicationEngine
class Foo(QObject):
textChanged = Signal()
def __init__(self, parent=None):
QObject.__init__(self, parent)
self._text = ""
@Property(str, notify=textChanged)
def text(self):
return self._text
@text.setter
def text(self, value):
if self._text == value:
return
self._text = value
self.textChanged.emit()
def update_value():
obj.text = "values from PyQt5 :-D : {}".format(QDateTime.currentDateTime().toString())
if __name__ == "__main__":
app = QGuiApplication(sys.argv)
obj = Foo()
timer = QTimer()
timer.timeout.connect(update_value)
timer.start(100)
engine = QQmlApplicationEngine()
engine.rootContext().setContextProperty("obj", obj)
engine.load(QUrl("main.qml"))
if not engine.rootObjects():
sys.exit(-1)
sys.exit(app.exec_())
主.qml:
import QtQuick 2.5
import QtQuick.Window 2.2
Window {
id: parwin
visible: true
width: 640
height: 480
Text{
anchors.fill: parent
text: obj.text
}
}
我有錯誤:
main.qml:11:9: Unable to assign [undefined] to QString
main.qml:11: TypeError: Cannot read property 'text' of null
告訴我我的錯誤在哪里?
看來PySide2 的setter 有一個bug,所以它沒有正確注冊Property,解決辦法是創建一個不同名稱的setter 和getter,並分別使用Property() 來公開它:
# ...
class Foo(QObject):
textChanged = Signal()
def __init__(self, parent=None):
QObject.__init__(self, parent)
self._text = ""
def get_text(self):
return self._text
def set_text(self, value):
if self._text == value:
return
self._text = value
self.textChanged.emit()
text = Property(str, fget=get_text, fset=set_text, notify=textChanged)
# ...
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