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#pragma once
#include "nes/app/ui/action.hh"
namespace nes::app
{
class renderer;
/// A part of the UI which takes care of rendering and handling input events.
///
/// One screen may be shown at a time. It may be used as an overlay over an active game.
class screen
{
public:
virtual ~screen() = default;
screen(screen const&) = delete;
screen(screen&&) = delete;
auto operator=(screen const&) -> screen& = delete;
auto operator=(screen&&) -> screen& = delete;
/// Render a frame with the current UI state.
virtual auto render(renderer&) -> void = 0;
/// Handle events and return an action for the application to execute.
virtual auto process_events() -> action = 0;
protected:
explicit screen() = default;
};
} // namespace nes::app
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