Make component more functionnal

src/ftxui/component/radiobox.cpp

@@ -1,36 +1,76 @@
+#include <stddef.h>    // for size_t
+#include <algorithm>   // for max, min
+#include <functional>  // for function
+#include <memory>      // for shared_ptr, allocator_traits<>::value_type
+#include <utility>     // for move
+
+#include "ftxui/component/captured_mouse.hpp"  // for CapturedMouse
+#include "ftxui/component/event.hpp"  // for Event, Event::ArrowDown, Event::ArrowUp, Event::Return, Event::Tab, Event::TabReverse
+#include "ftxui/component/mouse.hpp"  // for Mouse, Mouse::Left, Mouse::Pressed
 #include "ftxui/component/radiobox.hpp"
-
-#include <stddef.h>
-#include <algorithm>
-#include <functional>
-#include <memory>
-#include <utility>
-
-#include "ftxui/component/captured_mouse.hpp"
-#include "ftxui/component/mouse.hpp"
-#include "ftxui/component/screen_interactive.hpp"
+#include "ftxui/component/screen_interactive.hpp"  // for Component
 
 namespace ftxui {
 
-Element RadioBox::Render() {
+/// @brief A list of element, where only one can be selected.
+/// @param entries The list of entries in the list.
+/// @param selected The index of the currently selected element.
+/// @ingroup component
+/// @see RadioboxBase
+///
+/// ### Example
+///
+/// ```cpp
+/// auto screen = ScreenInteractive::TerminalOutput();
+/// std::vector<std::wstring> entries = {
+///     L"entry 1",
+///     L"entry 2",
+///     L"entry 3",
+/// };
+/// int selected = 0;
+/// auto menu = Radiobox(&entries, &selected);
+/// screen.Loop(menu);
+/// ```
+///
+/// ### Output
+///
+/// ```bash
+/// ◉ entry 1
+/// ○ entry 2
+/// ○ entry 3
+/// ```
+Component Radiobox(const std::vector<std::wstring>* entries, int* selected) {
+  return Make<RadioboxBase>(entries, selected);
+}
+
+// static
+RadioboxBase* RadioboxBase::From(Component component) {
+  return static_cast<RadioboxBase*>(component.get());
+}
+
+RadioboxBase::RadioboxBase(const std::vector<std::wstring>* entries,
+                           int* selected_)
+    : entries_(entries), selected_(selected_) {}
+
+Element RadioboxBase::Render() {
   std::vector<Element> elements;
   bool is_focused = Focused();
-  boxes_.resize(entries.size());
-  for (size_t i = 0; i < entries.size(); ++i) {
+  boxes_.resize(entries_->size());
+  for (size_t i = 0; i < entries_->size(); ++i) {
     auto style =
         (focused == int(i) && is_focused) ? focused_style : unfocused_style;
     auto focus_management = (focused != int(i)) ? nothing
                             : is_focused        ? focus
                                                 : select;
 
-    const std::wstring& symbol = selected == int(i) ? checked : unchecked;
-    elements.push_back(hbox(text(symbol), text(entries[i]) | style) |
+    const std::wstring& symbol = *selected_ == int(i) ? checked : unchecked;
+    elements.push_back(hbox(text(symbol), text(entries_->at(i)) | style) |
                        focus_management | reflect(boxes_[i]));
   }
   return vbox(std::move(elements));
 }
 
-bool RadioBox::OnEvent(Event event) {
+bool RadioboxBase::OnEvent(Event event) {
   if (!CaptureMouse(event))
     return false;
   if (event.is_mouse())
@@ -44,12 +84,12 @@ bool RadioBox::OnEvent(Event event) {
     new_focused--;
   if (event == Event::ArrowDown || event == Event::Character('j'))
     new_focused++;
-  if (event == Event::Tab && entries.size())
-    new_focused = (new_focused + 1) % entries.size();
-  if (event == Event::TabReverse && entries.size())
-    new_focused = (new_focused + entries.size() - 1) % entries.size();
+  if (event == Event::Tab && entries_->size())
+    new_focused = (new_focused + 1) % entries_->size();
+  if (event == Event::TabReverse && entries_->size())
+    new_focused = (new_focused + entries_->size() - 1) % entries_->size();
 
-  new_focused = std::max(0, std::min(int(entries.size()) - 1, new_focused));
+  new_focused = std::max(0, std::min(int(entries_->size()) - 1, new_focused));
 
   if (focused != new_focused) {
     focused = new_focused;
@@ -57,14 +97,14 @@ bool RadioBox::OnEvent(Event event) {
   }
 
   if (event == Event::Character(' ') || event == Event::Return) {
-    selected = focused;
+    *selected_ = focused;
     on_change();
   }
 
   return false;
 }
 
-bool RadioBox::OnMouseEvent(Event event) {
+bool RadioboxBase::OnMouseEvent(Event event) {
   if (!CaptureMouse(event))
     return false;
   for (int i = 0; i < boxes_.size(); ++i) {
@@ -78,8 +118,8 @@ bool RadioBox::OnMouseEvent(Event event) {
         event.mouse().motion == Mouse::Pressed) {
       cursor_position = i;
       TakeFocus();
-      if (selected != i) {
-        selected = i;
+      if (*selected_ != i) {
+        *selected_ = i;
         on_change();
       }
       return true;