Add option for Button.

examples/component/button.cpp

@@ -13,11 +13,13 @@ int main(int argc, const char* argv[]) {
   int value = 50;
 
   // The tree of components. This defines how to navigate using the keyboard.
+  auto button_option = ButtonOption();
+  button_option.border = false;
   auto buttons = Container::Horizontal({
       Button(
-          "[Decrease]", [&] { value--; }, false),
+          "[Decrease]", [&] { value--; }, &button_option),
       Button(
-          "[Increase]", [&] { value++; }, false),
+          "[Increase]", [&] { value++; }, &button_option),
   });
 
   // Modify the way to render them on screen:

include/ftxui/component/button.hpp

@@ -21,7 +21,9 @@ class ButtonBase : public ComponentBase {
   static ButtonBase* From(Component);
 
   // Constructor.
-  ButtonBase(ConstStringRef label, std::function<void()> on_click, bool border);
+  ButtonBase(ConstStringRef label,
+             std::function<void()> on_click,
+             ConstRef<ButtonOption> option);
   ~ButtonBase() override = default;
 
   // Component implementation.
@@ -31,8 +33,8 @@ class ButtonBase : public ComponentBase {
  private:
   ConstStringRef label_;
   std::function<void()> on_click_;
-  bool border_;
   Box box_;
+  ConstRef<ButtonOption> option_;
 };
 
 }  // namespace ftxui

include/ftxui/component/component.hpp

@@ -26,7 +26,7 @@ std::shared_ptr<T> Make(Args&&... args) {
 
 Component Button(ConstStringRef label,
                  std::function<void()> on_click,
-                 bool border = true);
+                 ConstRef<ButtonOption> = {});
 Component Checkbox(ConstStringRef label, bool* checked);
 Component Input(StringRef content, ConstStringRef placeholder);
 Component Menu(const std::vector<std::wstring>* entries,

include/ftxui/component/component_options.hpp

@@ -14,6 +14,10 @@ struct MenuOption {
   std::function<void()> on_enter = []() {};
 };
 
-};     // namespace ftxui
+struct ButtonOption {
+  bool border = true;
+};
+
+};  // namespace ftxui
 
 #endif /* end of include guard: FTXUI_COMPONENT_COMPONENT_OPTIONS_HPP */

src/ftxui/component/button.cpp

@@ -33,8 +33,8 @@ namespace ftxui {
 /// ```
 Component Button(ConstStringRef label,
                  std::function<void()> on_click,
-                 bool border) {
-  return Make<ButtonBase>(label, on_click, border);
+                 ConstRef<ButtonOption> option) {
+  return Make<ButtonBase>(label, std::move(on_click), std::move(option));
 }
 
 // static
@@ -44,12 +44,12 @@ ButtonBase* ButtonBase::From(Component component) {
 
 ButtonBase::ButtonBase(ConstStringRef label,
                        std::function<void()> on_click,
-                       bool border)
-    : label_(label), on_click_(on_click), border_(border) {}
+                       ConstRef<ButtonOption> option)
+    : label_(label), on_click_(on_click), option_(std::move(option)) {}
 
 Element ButtonBase::Render() {
   auto style = Focused() ? inverted : nothing;
-  auto my_border = border_ ? border : nothing;
+  auto my_border = option_->border ? border : nothing;
   return text(*label_) | my_border | style | reflect(box_);
 }