Refactor gallery function to separate class (#14)

* refactor gallery function to separate class

* typo and version adaptions

* clang-format

lib/app/DefaultApp.hpp

@@ -1,27 +1,25 @@
 #pragma once
 
 #include <cstddef>
-#include <memory>
 
 #include "AppGLFW.hpp"
+#include "app/PixelariumGallery.hpp"
 #include "imgui.h"
-#include "rendering/RenderImageManager.hpp"
 #include "resources/resource.hpp"
 #include "utilities/ILog.hpp"
 
-namespace pixelarium::ui
+namespace pixelarium::application
 {
 /// @brief Default implementation of AppGLFW.
 /// This can either be used as is, as an example or as a base class
 /// providing some defaults for a more custom implementation.
-class DefaultApp : public application::AppGLFW
+class DefaultApp : public AppGLFW
 {
    public:
     DefaultApp(const utils::log::ILog& log, pixelarium::resources::ImageResourcePool& pool)
-        : application::AppGLFW(log),
-          pool_(pool),
-          render_manager_(std::make_unique<render::RenderImageManager>(pool, log))
+        : application::AppGLFW(log), pool_(pool), gallery(log, pool)
     {
+        gallery.SetLoadFunction([&]() -> void { this->LoadImage(); });
     }
 
    protected:
@@ -31,16 +29,12 @@ class DefaultApp : public application::AppGLFW
 
    private:
     void LoadImage();
-    void ImageGalleryRender();
-    void RenderImages();
 
    private:
     resources::ImageResourcePool& pool_;
-    std::unique_ptr<render::RenderImageManager> render_manager_;
     bool image_listp_{true};
-    bool auto_show_selectd_image_{true};
     bool demop_{false};
     ImVec2 curr_dim_;
-    size_t selected_image_{0};
+    application::PixelariumImageGallery gallery;
 };
-}  // namespace pixelarium::ui
+}  // namespace pixelarium::application