Pipeable decoration and the package_manager example.

- Pipeable decorator. - package_manager example.
2025-11-04 05:28:15 +08:00 · 2019-01-05 02:03:49 +01:00
parent 178feaa6a9
commit 961e3dcb50
32 changed files with 351 additions and 128 deletions
--- a/examples/dom/package_manager.cpp
+++ b/examples/dom/package_manager.cpp
@@ -0,0 +1,123 @@
+#include <chrono>
+#include <iostream>
+#include <thread>
+
+#include "ftxui/screen.hpp"
+#include "ftxui/dom/elements.hpp"
+#include "ftxui/util/string.hpp"
+#include <list>
+#include <vector>
+
+using namespace ftxui;
+using namespace ftxui::dom;
+
+int main(int argc, const char *argv[])
+{
+  struct Task {
+    std::wstring name;
+    int number_of_threads;
+    int downloaded;
+    int size;
+  };
+
+  std::list<Task> remaining_tasks = {
+    {L"contact server       "  , 10 , 0 , 6*25} ,
+    {L"download index.html  "  , 10 , 0 , 9*25} ,
+    {L"download script.js   "  , 1 , 0 , 3*25} ,
+    {L"download style.js    "  , 1 , 0 , 4*25} ,
+    {L"download image.png   "  , 1 , 0 , 5*25}  ,
+    {L"download big_1.png   "  , 1 , 0 , 30*25}  ,
+    {L"download icon_1.png  "  , 1 , 0 , 7*25}  ,
+    {L"download icon_2.png  "  , 1 , 0 , 8*25}  ,
+    {L"download big_2.png   "  , 1 , 0 , 30*25}  ,
+    {L"download small_1.png "  , 1 , 0 , 10*25}  ,
+    {L"download small_2.png "  , 1 , 0 , 11*25}  ,
+    {L"download small_3.png "  , 1 , 0 , 12*25}  ,
+  };
+
+  std::list<Task> displayed_task;
+
+  int remaining_threads = 12;
+  std::string reset_position;
+
+  int nb_queued = remaining_tasks.size();
+  int nb_active = 0;
+  int nb_done = 0;
+
+  auto to_text = [](int number) {
+    std::wstring t = to_wstring(std::to_string(number));
+    while(t.size() < 3)
+      t = L" " + t;
+    return text(t);
+  };
+  
+  for(;;) {
+    std::vector<Element> entries;
+    for(auto& task : displayed_task) {
+      auto style = (task.downloaded == task.size) ? dim : bold;
+      entries.push_back(
+        hbox(
+          text(task.name) | style,
+          separator(),
+          to_text(task.downloaded),
+          text(L"/"),
+          to_text(task.size),
+          separator(),
+          gauge(task.downloaded / float(task.size))
+        )
+      );
+    }
+
+    auto document =
+      vbox(
+        window(text(L" Task "),
+          vbox(std::move(entries))
+        ),
+        hbox(
+          window(text(L" Summary "),
+            vbox(
+              hbox(text(L"- done:   "), to_text(nb_done) | bold) | color(Color::Green),
+              hbox(text(L"- active: "), to_text(nb_active) | bold ) | color(Color::RedLight),
+              hbox(text(L"- queue:  "), to_text(nb_queued) | bold) | color(Color::Red)
+            )
+          )
+        )
+      );
+
+    // Draw.
+    //if (step != 0) screen.Clear();
+    auto screen = ftxui::Screen::TerminalOutput(document);
+    Render(screen, document.get());
+    std::cout << reset_position << screen.ToString() << std::flush;
+    reset_position = screen.ResetPosition();
+
+    // Simulate time.
+    using namespace std::chrono_literals;
+    std::this_thread::sleep_for(0.01s);
+
+    if (nb_active + nb_queued == 0)
+      break;
+
+    // Update the model.
+    for(auto& task : displayed_task) {
+      if (task.downloaded != task.size) {
+        task.downloaded++;
+      } else if (task.number_of_threads) {
+        remaining_threads += task.number_of_threads;
+        task.number_of_threads = 0;
+        nb_active--;
+        nb_done++;
+      }
+    }
+
+    if (remaining_tasks.size() &&
+        remaining_tasks.front().number_of_threads <= remaining_threads) {
+      remaining_threads -= remaining_tasks.front().number_of_threads;
+      displayed_task.push_back(remaining_tasks.front());
+      remaining_tasks.pop_front();
+      nb_queued--;
+      nb_active++;
+    }
+  }
+  std::cout << std::endl;
+}