TerminalUI

TerminalUI is a main implementation to drive ui execution logic.

Create TerminalUI

You can build TerminalUI manually but recommended way is to use TerminalUIBuilder build is autoconfigured for you and will set needed services.

@Autowired
TerminalUIBuilder builder;

void sample() {
	TerminalUI ui = builder.build();
	// do something with ui
}

Configuring Views

TerminalUI has a helper method configure(View) which can be used to set needed integrations into eventloop and other services.

TerminalUI ui;

void sample() {
	BoxView view = new BoxView();
	ui.configure(view);
}

Running UI Loop

Running TerminalUI execution loop is a blocking operation. You’re going to need a way to exit from a loop, for example Exiting App.

TerminalUI ui;

void sample() {
	ui.run();
}

Exiting App

If you want to exit from an app using normal CTRL-Q key combination listen events and request interrupt.

@Autowired
Terminal terminal;

void sample() {
	TerminalUI ui = new TerminalUI(terminal);
	BoxView view = new BoxView();
	ui.configure(view);
	ui.setRoot(view, true);
	EventLoop eventLoop = ui.getEventLoop();
	eventLoop.keyEvents()
		.subscribe(event -> {
			if (event.getPlainKey() == Key.q && event.hasCtrl()) {
				eventLoop.dispatch(ShellMessageBuilder.ofInterrupt());
			}
		});
	ui.run();
}

Modal View

TerminalUI supports having one active modal view. Modal view is placed on top of all other views and takes all input events.

TerminalUI ui;

void sample() {
	DialogView dialog = new DialogView();
	// set modal
	ui.setModal(dialog);
	// clear modal
	ui.setModal(null);
}

As views should not directly know anything about TerminalUi and interface ViewService exposes modal related functions.