loop.cpp

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// Copyright 2022 Arthur Sonzogni. All rights reserved.
// Use of this source code is governed by the MIT license that can be found in
// the LICENSE file.
#include "ftxui/component/loop.hpp"
 
#include <utility>  // for move
 
#include "ftxui/component/screen_interactive.hpp"  // for ScreenInteractive, Component
 
namespace ftxui {
 
/// @brief A Loop is a wrapper around a Component and a ScreenInteractive.
/// It is used to run a Component in a terminal.
/// @ingroup component
/// @see Component, ScreenInteractive.
/// @see ScreenInteractive::Loop().
/// @see ScreenInteractive::ExitLoop().
/// @param screen The screen to use.
/// @param component The component to run.
// NOLINTNEXTLINE
Loop::Loop(ScreenInteractive* screen, Component component)
    : screen_(screen), component_(std::move(component)) {
  screen_->PreMain();
}
 
Loop::~Loop() {
  screen_->PostMain();
}
 
/// @brief Whether the loop has quitted.
/// @ingroup component
bool Loop::HasQuitted() {
  return screen_->HasQuitted();
}
 
/// @brief Execute the loop. Make the `component` to process every pending
/// tasks/events. A new frame might be drawn if the previous was invalidated.
/// Return true until the loop hasn't completed.
void Loop::RunOnce() {
  screen_->RunOnce(component_);
}
 
/// @brief Wait for at least one event to be handled and execute
/// `Loop::RunOnce()`.
void Loop::RunOnceBlocking() {
  screen_->RunOnceBlocking(component_);
}
 
/// Execute the loop, blocking the current thread, up until the loop has
/// quitted.
void Loop::Run() {
  while (!HasQuitted()) {
    RunOnceBlocking();
  }
}
 
}  // namespace ftxui