How to access the UI from another class ?

[jps3001]

d_stranz

I really appreciated your explanations in this thread but have few questions related:

How could you use a Class (Myclass) to initiate the signal as follows?

connect( myClass, SIGNAL( sendText( const QString & ) ), myUIClass, SLOT( updateText( const QString & ) ) );

In which QT program did you insert this Qt code (connect)?

Thks in advance,

[d_stranz]

If you don't understand something as basic to Qt as how to implement signals and slots, then you should spend some time studying the Qt documentation on them, and look at some of the QWidget examples, like the Calculator example.

[jps3001]

I do not have problem with signals and slots which I used quite often in the Mainwindow in my apps.
My concern is how to generate signals and slots between different classes.

I figured out that 'myClass' in your connect example is actually an object but can't find what 'myUIClass' refers to in your example, I tried MainWindow but did not work.

I wrote the connect function in the secondary class as follows:

QObject::connect(objetA, SIGNAL(SendPlot()),MainWindow, SLOT(addPlot()) );

but MainWindow is not recognized despite the following includes:

#include "ui_mainwindow.h"
#include "mainwindow.h"

Your help appreciated !

[anda_skoa]

In which QT program did you insert this Qt code (connect)?

The connect() call can be in any code where you have access to both the sender and the receiver object.
The other two arguments are basically just strings.

My concern is how to generate signals and slots between different classes.

No difference, really.

I figured out that 'myClass' in your connect example is actually an object but can't find what 'myUIClass' refers to in your example, I tried MainWindow but did not work.

It refers to a different object than the one "myClass" refers to.
Both these arguments are just pointers to QObject.

I wrote the connect function in the secondary class as follows:

QObject::connect(objetA, SIGNAL(SendPlot()),MainWindow, SLOT(addPlot()) );

but MainWindow is not recognized despite the following includes:

Do you have a QObject pointer variable named MainWindow?
Given its capitalization it looks awefully like the name of a class.

Cheers,
_

[jps3001]

You are right, Mainwindow is a Class and not an Object

However I can't figure out how to implement the following:

I need to add a Widget to ui->verticalLayout->addWidget(plot0)

as you know ui is private, I intend to use connect to access a SLOT which will add this Widget(plot0)

but I do not have an Object available in ui.

Should I have to create a dummy object just for this ?

I'm really puzzled !

[anda_skoa]

Aside from the fact that it is not very customary to send a QWidget pointer via a signal, the standard rules for signal/slot connects apply:

You need to have access to both the sender and the receiver pointer at the place where you put the connect.

So what good would a "dummy object" do?

Forget about Qt or signal/slots until you have a place where you have access to both pointers.
Basic C++.

Cheers,
_

[jps3001]

No help available ??

[anda_skoa]

There are plenty of C++ tutorials online, some of them should cover object creation, passing data through methods, storing data in variable and members.

Cheers,
_