Question

I’m creating a GUI with Qt and I’m trying to interact with elements on different levels.

#include <QtGui>
#include "mywindow.h"
#include "component.h"
#include "przystanki.h"
MyWindow::MyWindow(QWidget *parent) :
QMainWindow(parent)
{
    webView = new MyWebView(this);
    mainlayout = new QGridLayout();
    mainlayout->addWidget(webView, 0,0);
    Przystanki *stop = new Przystanki(this);
    mainlayout->addWidget(stop, 0, 1);
    QHBoxLayout* bottom = new QHBoxLayout();
    bottom->addWidget(new Component("Linie"));
    bottom->addWidget(new Component("Autobusy"));
    QHBoxLayout* hrightCorner = new QHBoxLayout();
    QVBoxLayout* rightCorner = new QVBoxLayout();
    rightCorner->addStretch(1);
    rightCorner->addWidget(new QPushButton("Start", this));
    rightCorner->addStretch(1);
    hrightCorner->addLayout(rightCorner);
    mainlayout->addLayout(bottom, 1, 0);
    mainlayout->addLayout(hrightCorner, 1, 1);
    hrightCorner->setAlignment(Qt::AlignCenter);
    this->setCentralWidget(new QWidget);
    this->centralWidget()->setLayout(mainlayout);

}

In the webView I’ve got a method inside which I want to add an element to a list which is in the Przystanki class.

How can I do it? Is it possible to access it in an easy way or do I have to refactor my code in some way? (If so please give me some advice in what way I should do it).

Answer 1

You could:

• add a signal in the MyWebView class with the data you wish to add as a parameter,
• add a slot in the Przystanki class with the same parameter type as the signal,
• connect the signal to the slot in QMainWindow constructor.

This way, the MyWebView class doesn’t need to know anything about the Przystanki class, and it just has to emit a signal.