Function main

examples/SpinButton.cpp:9–104

#include <SFML/Graphics.hpp>

int main() {
	// Create the main SFML window
	sf::RenderWindow app_window( sf::VideoMode( { 800, 600 } ), "SFGUI SpinButton Example", sf::Style::Titlebar | sf::Style::Close );

	// We have to do this because we don't use SFML to draw.
	app_window.resetGLStates();

	// Create an SFGUI. This is required before doing anything with SFGUI.
	sfg::SFGUI sfgui;

	// Create our main SFGUI window
	auto window = sfg::Window::Create();
	window->SetTitle( "Title" );

	// Create a box to contain our SpinButton and progress bar.
	auto box = sfg::Box::Create( sfg::Box::Orientation::VERTICAL, 10.f );

	// Create the SpinButton itself.
	auto spinbutton = sfg::SpinButton::Create( -2.f, 18.f, .4f );

	// Just like an Entry, you need to specify a minimum width for the SpinButton.
	spinbutton->SetRequisition( sf::Vector2f( 80.f, 0.f ) );

	// Set the number of digits to display after the decimal point.
	spinbutton->SetDigits( 2 );

	// Add the SpinButton to the box.
	box->Pack( spinbutton );

	// Create our progress bar and set its size.
	auto progress_bar = sfg::ProgressBar::Create();
	progress_bar->SetRequisition( sf::Vector2f( 80.f, 20.f ) );

	// Connect the OnValueChanged signal so we get notified when the SpinButton's value changes.
	spinbutton->GetSignal( sfg::SpinButton::OnValueChanged ).Connect( [&spinbutton, &progress_bar] {
		const auto& adjustment = spinbutton->GetAdjustment();

		auto range = adjustment->GetUpper() - adjustment->GetLower();
		auto inverse_fraction = 1.f - ( spinbutton->GetValue() - adjustment->GetLower() ) / range;

		progress_bar->SetFraction( inverse_fraction );
	} );

	// Add the progress bar to the box.
	box->Pack( progress_bar );

	// Set the initial value of the SpinButton.
	// We can only do this after we create our progress bar because the way we
	// set it, it will try to update the progress bar when we change its value.
	spinbutton->SetValue( 4.f );

	// Add the box to the window.
	window->Add( box );

	// Our clock.
	sf::Clock clock;

	// Update an initial time to construct the GUI before drawing begins.