问题描述
我正在使用BB Native SDK开发Blackberry 10移动应用程序.
I'm developing a Blackberry 10 mobile application using the BB Native SDK.
我需要在我的C ++类中调用QML函数.我对此进行了很多搜索,但是我只发现了将C ++调用到QML中的可能性,而不是相反的情况.您可以检查以下内容: QML和C ++集成
I need to call a QML function into my C++ class. I searched a lot on this but I only found the possibility to call C++ into QML not the inverse. You can check this: QML and C++ integration
有人可以帮我吗?
这是QML代码,用于指定我需要调用的函数,该函数会在地图视图中添加标记:
This is the QML code specifying the function that I need to call which add a marker into my mapview:
Container {
id: pinContainer
objectName: "pinContObject"
...
function addPin(lat, lon, name, address) {
var marker = pin.createObject();
marker.lat = lat;
marker.lon = lon;
...
}
}
推荐答案
这就是信号和插槽的作用.您可以使用QML连接将任意信号连接到QML中的任意插槽.
Thats what signals and slots are for.You can use the QML Connections for connecting arbitrary signals to arbitrary slots in QML.
http://qt-project.org/doc/qt- 4.8/qml-connections.html
Container {
id: pinContainer
objectName: "pinContObject"
...
function addPin(lat, lon, name, address) {
var marker = pin.createObject();
marker.lat = lat;
marker.lon = lon;
...
}
Connections {
target: backend
onDoAddPin: {
addPin(latitude, longitude,name, address)
}
}
}
在C ++后端中,您要做的就是
and in C++ backend, all you have to do is
class Backend: public QObject {
signals:
void doAddPin(float latitude, float longitude, QString name, QString address);
........
void callAddPinInQML(){
emit doAddPin( 12.34, 45.67, "hello", "world");
}
}
这篇关于从C ++调用QML函数的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!