[nostalgia] Add basic support for subsheets

src/nostalgia/core/studio/tilesheeteditor-imgui.hpp

@@ -14,7 +14,7 @@
 
 #include "tilesheetpixelgrid.hpp"
 #include "tilesheetpixels.hpp"
-#include "tilesheeteditor.hpp"
+#include "tilesheeteditorview.hpp"
 
 namespace nostalgia::core {
 
@@ -24,8 +24,8 @@ class TileSheetEditorImGui: public studio::Editor {
 		ox::String m_itemPath;
 		ox::String m_itemName;
 		glutils::FrameBuffer m_framebuffer;
-		TileSheetEditor m_tileSheetEditor;
-		float m_palViewWidth = 200;
+		TileSheetEditorView m_tileSheetEditor;
+		float m_palViewWidth = 300;
 		geo::Vec2 m_prevMouseDownPos;
 
 	public:
@@ -47,12 +47,24 @@ class TileSheetEditorImGui: public studio::Editor {
 
 		void draw(core::Context*) noexcept override;
 
+		void drawSubsheetSelector(TileSheet::SubSheet*, TileSheet::SubSheetIdx *path) noexcept;
+
 		studio::UndoStack *undoStack() noexcept final;
 
 	protected:
 		void saveItem() override;
 
 	private:
+		[[nodiscard]]
+		constexpr auto model() const noexcept {
+			return m_tileSheetEditor.model();
+		}
+
+		[[nodiscard]]
+		constexpr auto model() noexcept {
+			return m_tileSheetEditor.model();
+		}
+
 		void setPalette();
 
 		void saveState();
@@ -73,7 +85,7 @@ class TileSheetEditorImGui: public studio::Editor {
 	private:
 		ox::Error updateAfterClicked() noexcept;
 
-		ox::Error markUnsavedChanges() noexcept;
+		ox::Error markUnsavedChanges(int) noexcept;
 
 };