Example
To call the QML classes in C++, you need to set the objectName property.
Apr 13, 2016 Signals and slots are the basic foundation of Qt C GUI Application. In this QT tutorial we will learn signal and slots tutorial fnctions work by creating an example application. How to create.
In your Qml:
Then, in your C++, you can get the object with QObject.FindChild<QObject*>(QString)
Like that:
Now you have your QML object in your C++. But that could seems useless since we cannot really get the components of the object.
However, we can use it to send signals between the QML and the C++. To do that, you need to add a signal in your QML file like that: signal buttonClicked(string str). Once you create this, you need to emit the signal. For example:
Here we have our qml button. When we click on it, it goes to the onClicked method (a base method for buttons which is called when you press the button). Then we use the id of the button and the name of the signal to emit the signal.
And in our cpp, we need to connect the signal with a slot. like that:
main.cpp
As you can see, we get our qml button with findChild as before and we connect the signal to a Button manager which is a class created and who look like that. ButtonManager.h
ButtonManager.cpp
So when the signal will be received, it will call the method onButtonClicked which will write 'button: clicked !'
output: