Added UI component, resource & system. Now renders on screen and live reloads

Nuake/src/Scene/Systems/UISystem.cpp

@@ -0,0 +1,70 @@
+#include "UISystem.h"
+#include "src/Resource/ResourceManager.h"
+#include "src/Resource/ResourceLoader.h"
+#include "src/Resource/UI.h"
+#include "src/Scene/Scene.h"
+#include "src/FileSystem/File.h"
+#include "src/Scene/Components/UIComponent.h"
+#include "src/FileSystem/FileSystem.h"
+
+namespace Nuake
+{
+	UISystem::UISystem(Scene* scene)
+	{
+		m_Scene = scene;
+	}
+
+	bool UISystem::Init()
+	{
+		return true;
+	}
+
+	void UISystem::Update(Timestep ts)
+	{
+		auto uiView = m_Scene->m_Registry.view<UIComponent>();
+		for (auto e : uiView)
+		{
+			auto& uiViewComponent = uiView.get<UIComponent>(e);
+			const std::string& filePath = uiViewComponent.UIFilePath;
+			if (uiViewComponent.UIResource == 0)
+			{
+				if (filePath.empty() || !FileSystem::FileExists(filePath))
+				{
+					continue;
+				}
+
+				Ref<UIResource> uiResource = ResourceLoader::LoadUI(filePath);
+				uiViewComponent.UIResource = uiResource->ID;
+				uis[uiViewComponent.UIResource] = uiResource;
+
+				ResourceManager::RegisterResource(uiResource);
+			}
+			else
+			{
+				if (FileSystem::FileExists(filePath))
+				{
+					Ref<File> file = FileSystem::GetFile(filePath);
+					if (file->GetHasBeenModified())
+					{
+						uis[uiViewComponent.UIResource]->Reload();
+						file->SetHasBeenModified(false);
+					}
+
+					uis[uiViewComponent.UIResource]->Draw();
+				}
+			}
+		}
+	}
+
+	void UISystem::FixedUpdate(Timestep ts)
+	{
+	}
+
+	void UISystem::EditorUpdate()
+	{
+	}
+
+	void UISystem::Exit()
+	{
+	}
+}