我有以下几种情况,我想使用几个Qml:“welcome.Qml”、“create.Qml”、“dashboard.Qml”
在哪些情况下使用QQuickview或QqmlApplicationEngine
我使用“QQmlAplicatiobEngine”并使用findChild在对象中搜索以获取信号,并处理逻辑,如果信号完成一个条件,我使用engine.load加载另一个QML
python:
class guiBackend(QObject):
def __init__(self):
self.engine = QQmlApplicationEngine()
self.context = self.engine.rootContext()
self.context.setContextProperty("main", self.engine)
self.welcome()
def welcome(self):
self.engine.load("welcome.qml")
self.engine.rootObjects()[0].show()
ob = self.engine.rootObjects()[0]
next = ob.findChild(QObject, "timer")
print(dir(next))
if path.exists('data.some'):
next.change.connect(self.open_account)
else:
next.change.connect(self.create_account)
def create(self):
self.engine.rootObjects()[0].close()
self.engine.load("create.qml")
self.engine.rootObjects()[1].show()
add = ob.findChild(QObject, "addWallet")
recovery = ob.findChild(QObject, "recovery")
add.change.connect(self.add_account)
recovery.change.connect(self.recovery)
#self.open_account load dashboard.qml and self.account load form.qml
if __name__ == "__main__":
app = QGuiApplication(sys.argv)
gui = guiBackend()
sys.exit(app.exec_())
Qml:
ApplicationWindow {
id: welcome
width: 650; height: 390
opacity: 1
visible: true
minimumHeight: 232
minimumWidth:226
title: "open account"
flags: Qt.SplashScreen
Item {
id: element
x: 9
y: 88
width: 560
height: 300
anchors.horizontalCenter: parent.horizontalCenter
anchors.verticalCenter: parent.verticalCenter
Timer {
signal change
objectName: "timer"
interval: 5000; running: true; repeat: false
onTriggered: change()
}
Image {
id: image
x: 130
y: 60
width: 342
height: 188
anchors.verticalCenterOffset: -56
anchors.horizontalCenterOffset: 0
anchors.verticalCenter: parent.verticalCenter
anchors.horizontalCenter: parent.horizontalCenter
source: "neirons_logo.png"
fillMode: Image.PreserveAspectFit
}
AnimatedImage {
id: animatedImage
x: 236
y: 200
width: 100
height: 100
source: "loading.gif"
}
}
}
create.qml:
ApplicationWindow {
id: create
width: 210; height: 210
Rectangle {
id: rectangle
x: 70
y: 132
width: 200
height: 200
color: "#72ded8"
anchors.verticalCenterOffset: 0
anchors.horizontalCenterOffset: 0
anchors.horizontalCenter: parent.horizontalCenter
anchors.verticalCenter: parent.verticalCenter
ColumnLayout {
x: 60
y: 73
width: 109
height: 128
anchors.verticalCenter: parent.verticalCenter
anchors.horizontalCenter: parent.horizontalCenter
TextInput {
id: nameAccount
objectName: textAccount
text: qsTr("nameAccount")
Layout.fillWidth: true
Layout.alignment: Qt.AlignHCenter | Qt.AlignTop
Layout.preferredHeight: 20
Layout.preferredWidth: 80
verticalAlignment: Text.AlignVCenter
font.pixelSize: 12
}
TextInput {
id: nameAccount
objectName: textAccount
text: qsTr("Name Account")
Layout.fillWidth: true
Layout.alignment: Qt.AlignHCenter | Qt.AlignTop
Layout.preferredHeight: 20
Layout.preferredWidth: 80
font.pixelSize: 12
}
}
Button {
signal addinfo
id: submitNameAccount
objectName: submit
x: 50
y: 134
width: 81
height: 23
text: qsTr("Add")
font.bold: true
font.pointSize: 12
anchors.horizontalCenter: parent.horizontalCenter
onClicked: addinfo()
}
}
最好使用QQuickview或QQMlapplicationEngine
根据OP提供的内容,我将指出以下几个方面:
什么时候应该使用
QQmlAplicationEngine
或QQuickview
?更好的是QQmlAplicationEngine
还是QQuickview
?一个或另一个的使用取决于QML的根元素,如果根元素是Window或ApplicationWindow,则必须使用QQMLapplicationEngine,如果它是项或其派生项,则可以使用QQuickView。所以对于上面的一个并不比另一个好。如果使用根窗口加载QML或使用QQuickView加载ApplicationWindow,会发生什么情况?然后它将显示两个窗口:一个来自QQuickView,另一个来自窗口或应用程序窗口。如果我加载一个带有QQML应用程序引擎的项的QML会怎么样?您需要将其放置在一个窗口中,如the docs所示:
不要从python/C++访问QML元素
QML有它自己的变量处理,所以您可以随时删除或创建它,因为并没有任何确定,所以访问这些对象可能是危险的,因为它们可能并没有分配内存。正确的做法是做相反的事情,将QObject导出到QML并在QML中建立连接
我们将把上述概念应用到OP提供的代码中(我已经纠正了一些类型)
首先,因为根是ApplicationWindow,所以应该使用QQmlApplicationEngine
您可以使用setContextProperty将后端导出到QML,然后直接调用插槽,而不是在每个元素中创建“change”信号。使用rootObjects()获取对象是危险的,因为存在异步加载的QML,请改用objectCreated信号
main.py
欢迎光临。qml
钱包.qml
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