Initialize

ftxui/examples/component/with_restored_io.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 <cstdlib>   // for system, EXIT_SUCCESS
+#include <iostream>  // for operator<<, basic_ostream, basic_ostream::operator<<, cout, endl, flush, ostream, basic_ostream<>::__ostream_type, cin
+#include <memory>    // for shared_ptr, __shared_ptr_access, allocator
+#include <string>    // for getline, string
+
+#include "ftxui/component/captured_mouse.hpp"  // for ftxui
+#include "ftxui/component/component.hpp"  // for Button, Horizontal, Renderer
+#include "ftxui/component/component_base.hpp"      // for ComponentBase
+#include "ftxui/component/screen_interactive.hpp"  // for ScreenInteractive
+#include "ftxui/dom/elements.hpp"  // for operator|, filler, Element, borderEmpty, hbox, size, paragraph, vbox, LESS_THAN, border, center, HEIGHT, WIDTH
+
+int main() {
+  using namespace ftxui;
+
+  auto screen = ScreenInteractive::Fullscreen();
+
+  // When pressing this button, "screen.WithRestoredIO" will execute the
+  // temporarily uninstall the terminal hook and execute the provided callback
+  // function. This allow running the application in a non-interactive mode.
+  auto btn_run = Button("Execute with restored IO", screen.WithRestoredIO([] {
+    std::cout << "This is a child program using stdin/stdout." << std::endl;
+    for (int i = 0; i < 10; ++i) {
+      std::cout << "Please enter 10 strings (" << i << "/10)" << std::flush;
+      std::string input;
+      std::getline(std::cin, input);
+    }
+  }));
+
+  auto btn_quit = Button("Quit", screen.ExitLoopClosure());
+
+  auto layout = Container::Horizontal({
+      btn_run,
+      btn_quit,
+  });
+
+  auto renderer = Renderer(layout, [&] {
+    auto explanation = paragraph(
+        "After clicking this button, the ScreenInteractive will be "
+        "suspended and access to stdin/stdout will temporarilly be "
+        "restore for running a function.");
+    auto element = vbox({
+        explanation | borderEmpty,
+        hbox({
+            btn_run->Render(),
+            filler(),
+            btn_quit->Render(),
+        }),
+    });
+
+    element = element | borderEmpty | border | size(WIDTH, LESS_THAN, 80) |
+              size(HEIGHT, LESS_THAN, 20) | center;
+    return element;
+  });
+
+  screen.Loop(renderer);
+  return EXIT_SUCCESS;
+}