04-simple-property/main.cpp

An example of how to create a KDBindings::Property and use its valueChanged() KDBindings::Signal to receive notifications whenever the value of the KDBindigns::Property changes.

The output of this example is:

The new value is 42
The new value is 69
Property value is 69

/*
  This file is part of KDBindings.
 
  SPDX-FileCopyrightText: 2021 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
  Author: Sean Harmer <sean.harmer@kdab.com>
 
  SPDX-License-Identifier: MIT
 
  Contact KDAB at <info@kdab.com> for commercial licensing options.
*/
 
#include <kdbindings/property.h>
 
#include <iostream>
#include <string>
 
using namespace KDBindings;
 
class Widget
{
public:
    Widget(std::string const &name)
        : value(0)
        , m_name(name)
    {
    }
 
    Property<int> value;
 
private:
    std::string m_name;
};
 
int main()
{
    Widget w("A cool widget");
 
    (void)w.value.valueChanged().connect([](int newValue) {
        std::cout << "The new value is " << newValue << std::endl;
    });
 
    w.value = 42;
    w.value = 69;
 
    std::cout << "Property value is " << w.value << std::endl;
 
    return 0;
}