Initial UI in src

src/UI/UI_slider.cpp

@@ -0,0 +1,45 @@
+#include "UI_slider.hpp"
+
+UI_slider::UI_slider(std::string id, std::string text, Color fg_color, Color bg_color, double min, double max, double value,  UI_slider_on_change on_change)
+    : UI_item(id, UI_SLIDER_TYPE, text, 12, fg_color, bg_color), p_min(min), p_max(max), p_value(value)
+{
+    this->p_on_change = on_change;
+}
+
+UI_slider::UI_slider(const json& j)
+: UI_item(UI_SLIDER_TYPE)
+{
+    from_json(j);
+}
+
+void UI_slider::set_value(double value)
+{
+    if (p_on_change != nullptr)
+    {
+        this->p_value = value;
+        p_on_change(p_id, value);
+    }
+}
+
+double UI_slider::value() const
+{
+    return p_value;
+}
+
+void UI_slider::from_json(const json& j)
+{
+    UI_item::from_json(j);
+
+    this->p_min = j["min"];
+    this->p_max = j["max"];
+    this->p_value = j["value"];
+}
+
+json UI_slider::to_json() const
+{
+    json j = UI_item::to_json();
+    j["min"] = this->p_min;
+    j["max"] = this->p_max;
+    j["value"] = this->p_value;
+    return j;
+}