Show different qml ui from c++

[firefox]

folks,

got another problem

I have this signal messageReceivedToQml emitted by my c++ backend when a new message arrives.
And I connected to my qml like this

Connections {
        target: loginClass
        onMessageReceivedToQml: {
            console.log("in client connections")
            Script.createChatWindow()
        }
    }

my createChatWindow javascript function is

function createChatWindow() {
    console.log("creating chat window");
    var chatWindow2 = Qt.createComponent("ChatWindow.qml");
    chatWindow2.createObject(clientId);
}

the log 'creating chat window' gets printed when i receive a message but the chat window created is not visible. Am I missing something here?

[mrjj]

Hi
I dont know QML but
i was wondering if it needs something like
chatWindow2.visible = true
or
chatWindow2.show()

Sorry if its just silly. :)

[firefox]

@mrjj Even I'm new to qml. nothing is sily to me :)

I can't beleive i did the same mistake of using local variables instead of global. (Update: this is not the issue. Just had to delete the build folder and build again)
I changed the code as below.

var chatWindow;
var sprite;
function createChatWindow() {
    console.log("creating chat window");
    chatWindow = Qt.createComponent("ChatWindow.qml");
    sprite=chatWindow.createObject(clientId);
}

Update:Okay, It worked after the above changes. I just had to delete the build folder and build again.

damn i edited the post instead of new post and everything is gone. edited again and added the code.

[firefox]

Hi folks,

Have an issue here. have a look at this code I'm trying.

function handleMessage(from, msg) {
    var mysprite = loginClass.checkJid(from);  //This method returns the QQuickWindow object
    if(mysprite != "not found")
    {
        console.log("in append block")   //This means this is a connected client and is not the first message. So we just append the message to chatAreaId(TextArea)
        mysprite.chatAreaId.append(from+":"+msg);   //chatAreaId is the id of TextArea component 
    }
    else {
        mysprite = createChatWindow();
        console.log("in chat window block")    //This means the client is connecting to us for first time. so we need to create a dedicated chat window for the client  and add the id of client to backend with addToJids
        loginClass.addToJids(from, mysprite);
        mysprite.chatAreaId.append(from+":"+msg);
    }
}

function createChatWindow() {
    var chatWindow;
    var sprite;
    console.log("creating chat window");
    chatWindow = Qt.createComponent("ChatWindow.qml");
    sprite=chatWindow.createObject(clientId);   //This is a QQuickWindow
    return sprite;
}

So when I get a message I want to append it to TextArea component of my QQuickWindow object created dynamically with createObject.() function. But how do I access the qml components of QQuickWindow created dynamically?

The above code gives an error saying "Cannot call method 'append' of undefined"

[firefox]

Is this even a proper approach. I have a QHash in my c++ backend of type <QString, QQuickWindow>
which stores key value pairs of clientId and chat window instance for the client.

So when my application gets a incoming message, It first checks if there is already chat window instance for the client and gets the instance and appends the message to that window.

If the client is connecting for first time, a new chat window is created and is added to QHash

[A Former User]

Please show us your checkJid() function.

[A Former User]

@firefox said:

Is this even a proper approach.

Well, you're building a backend in C++ and the GUI in QML. Now you start managing windows (parts of the GUI) in C++ again. Of course it will work but IMAO it's bad design. You should really do all GUI related stuff in QML.

[firefox]

Yeah. I don't want to deal with QQuickWindow objects in C++. The control already seems to sphagettified and confused to whoever is reading the code. I'm thinking of a different approach.

Here is the requirement.

When we get a message, C++ emits a signal messageReceived(from, message). It should be qml's responsibility to direct the message to appropriate chat window/create a new chat window if required.

The only thoughts I'm getting are creating map/hash like some data structure in qml that can hold a key and reference to chat window objects. I'm researching if it is possible in qml. Guess I'm still thinking in C++ way instead of qml way. You guys suggest anything ?

[A Former User]

@firefox said:

When we get a message, C++ emits a signal messageReceived(from, message).

I wouldn't even do that. Better store all messages in a model in the backend, use a custom view to display / modify the data in QtQuick and let the model / view do all the synchronization.

[firefox]

Hi guys,

An update.
So when I get the user gets a message, back-end parses the message and emits a messagaReceived(from,msg) signal.

Qml picks up the messageReceived signal and is connected to handleMessage javascript slot to direct the message to appropriate window.

var windows = [];
function handleMessage(from, msg) {

    for(var i=0; i<windows.length;i++) {
        if(windows[i].jid == from) {
            console.log("FOUND MATCHING WINDOW");
            windows[i].chatBox.append(msg);
            return;
        }
    }
    var mysprite = createChatWindow(from);
    console.log("in chat window block")    //This means the client is connecting to us for first time. so we need to create a dedicated chat window for the client  and add the is of client to backend with addToJids
    mysprite.chatBox.append(msg);
}

function createChatWindow(from) {
    var chatWindow;
    var sprite;
    console.log("creating chat window");
    chatWindow = Qt.createComponent("ChatWindow.qml");
    sprite=chatWindow.createObject(clientId,{"jid":from});  //This is a QQuickWindow
    windows.push(sprite);
    console.log("test "+sprite.jid);
    return sprite;
}

I think I got the core functionality working. I'll be prettying up the UI little bit before adding other features.

@Wieland said:

@firefox said:

When we get a message, C++ emits a signal messageReceived(from, message).

I wouldn't even do that. Better store all messages in a model in the backend, use a custom view to display / modify the data in QtQuick and let the model / view do all the synchronization.

I tried this but couldn't get a working prototype because of my inexperience with models, views(guess qml in general). I'll try to refactor the above working method to something elegant soon. Thanks. :)