Add the slider component.

include/ftxui/component/component.hpp

@@ -1,6 +1,7 @@
 #ifndef FTXUI_COMPONENT_COMPONENT_HPP
 #define FTXUI_COMPONENT_COMPONENT_HPP
 
+#include <memory>
 #include "ftxui/component/event.hpp"
 #include "ftxui/dom/elements.hpp"
 
@@ -60,6 +61,8 @@ class Component {
   std::vector<Component*> children_;
 };
 
+using ComponentPtr = std::unique_ptr<Component>;
+
 }  // namespace ftxui
 
 #endif /* end of include guard: FTXUI_COMPONENT_COMPONENT_HPP */

include/ftxui/component/slider.hpp

@@ -0,0 +1,25 @@
+#ifndef FTXUI_COMPONENT_SLIDER_HPP
+#define FTXUI_COMPONENT_SLIDER_HPP
+
+#include <string>
+#include "ftxui/component/component.hpp"
+
+namespace ftxui {
+// ComponentPtr Slider(std::string label,
+// float* value,
+// float min = 0.f,
+// float max = 100.f,
+// float increment = (max - min) * 0.05f);
+
+ComponentPtr Slider(std::wstring label,
+                    int* value,
+                    int min,
+                    int max,
+                    int increment);
+}  // namespace ftxui
+
+#endif /* end of include guard: FTXUI_COMPONENT_SLIDER_HPP */
+
+// Copyright 2020 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.