Sending parameters from C++

DenisKormalev

you can use something like
@
view->rootContext()->setContextProperty("listModel", model);
@

? Offline

[quote author="Denis Kormalev" date="1291291116"]you can use something like
@
view->rootContext()->setContextProperty("listModel", model);
@
[/quote]

what I'm looking for is something like this. I have this JS function on the QML/JS side:

@WorkerScript.onMessage = function(msg) {
if (msg.action == 'appendCurrentTime') {
var data = {'time': new Date().toTimeString()};
msg.model.append(data);
msg.model.sync(); // updates the changes to the list
}
}
@

from QML/JS side I can call this function like this:
@var msg = {'action': 'appendCurrentTime', 'model': listModel};
worker.sendMessage(msg);
@

but I want to call this function from C++ and send this parameter:
@var msg = {'action': 'appendCurrentTime', 'model': listModel};@

Is it possible? or I need to update the entire ListModel from C+?

xsacha

Not sure if this is what you mean, but I am using this:

In C++:
appdata.h
@class ApplicationData : public QObject
{
Q_OBJECT
public:
Q_INVOKABLE QDateTime getCurrentDateTime() const {
return QDateTime::currentDateTime();
}
};
@
main.cpp
@#include "appdata.h"
...
viewer.rootContext()->setContextProperty("applicationData", &data);@

in QML:
@logDir.appendContent(Qt.formatDateTime(applicationData.getCurrentDateTime(), "hh:mm")@

To refresh the content, you can use the Timer as per that JS example you have. The call will always retrieve the latest value.

? Offline

oh ok. I thing I gave a bad example.
In QML/JS you call a function using this parameter:

@var msg = {'propertyName1': 'propertyVal1', 'propertyName2': propertyVal2};
someFunction(msg);
@

I want to call the JS function: someFunction from C++ with the same parameter, but I don't know how to write that parameter in C++ :
@var msg = {'propertyName1': 'propertyVal1', 'propertyName2': propertyVal2};@

blam

The JavaScript function isn't available to C++. So the easiest way is do what you want is to create a method in your QML component that passes the method call onto the JS function. Then, you can call the method in the QML component from C++.

? Offline

[quote author="blam" date="1291335496"]The JavaScript function isn't available to C++. So the easiest way is do what you want is to create a method in your QML component that passes the method call onto the JS function. Then, you can call the method in the QML component from C++.

[/quote]

Thanks, I knew that, but can I send that variable from C++ to QML? or I need to create in JS a function with simple parameters(strings and integers for example) and than on that function create the msg variable and call the other JS function .

? Offline

The idea is that I know how to make this work, what I'm looking for is the best way to implement this. That's why I was curious if I can pass "complex" variables from C++ to qml .

xsacha

We gave examples of sending a variable from C++ to QML using setContextProperty(..).

Do you want to see a more complete example with additional variables?

You can send a whole class from C++ to QML as a Type.

The backend is 100% Qt, so this is how all those Types are done in the first place.

blam

Ah, I see, you mean passing something like a js object from C++ to QML?

You can pass a QVariantMap value. For example this C++:

@
QVariantMap map;
map.insert("aaa", 111);
map.insert("bbb", 222);
QMetaObject::invokeMethod(myQmlObject, "someFunction", Q_ARG(QVariant, QVariant::fromValue(map)));
@

can call this QML:

@
Item {
function someFunction(value) {
console.log(value.aaa, value.bbb) // prints "111, 222"
}
}
@

? Offline

thanks blam. I will try your example. looks similar to what I'm looking for.