QT Creational Operators

QT creational operators are operators that create new observable from QObjects. More...

Functions
template<std::derived_from< QObject > TSignalQObject, std::derived_from< TSignalQObject > TObject, typename R , typename... Args>
auto	rppqt::source::from_signal (const TObject &object, R(TSignalQObject::*signal)(Args...))
	Creates rpp::observable that emits a items from provided QT signal.

Detailed Description

QT creational operators are operators that create new observable from QObjects.

Function Documentation

from_signal()

template<std::derived_from< QObject > TSignalQObject, std::derived_from< TSignalQObject > TObject, typename R , typename... Args>

auto rppqt::source::from_signal	(	const TObject &	object,
		R(TSignalQObject::*	signal )(Args...) )

Creates rpp::observable that emits a items from provided QT signal.

Parameters

object	is QObject which would emit signals
signal	is interested signal which would generate emissions for observable. Expected to obtain pointer to member function representing signal

Examples:

    QTextEdit* text_edit = new QTextEdit();
    rppqt::source::from_signal(*text_edit, &QTextEdit::textChanged)
        | rpp::ops::map([&](const auto&) {
              return text_edit->toPlainText();
          })
        | rpp::ops::subscribe([](const QString& text) { std::cout << "text changed: " << text.toStdString() << std::endl; },
                              []() { std::cout << "text_edit destroyed!" << std::endl; });
    text_edit->setText("123");
    text_edit->setText("temp");
    delete text_edit;
    // Output:
    // text changed: 123
    // text changed: temp
    // text_edit destroyed!

Examples

from_signal.cpp, and qt_readme.cpp.