Add Load method to editor classes and update corresponding headers

src/app/editor/graphics/graphics_editor.cc

@@ -42,6 +42,11 @@ constexpr ImGuiTableFlags kGfxEditTableFlags =
 
 void GraphicsEditor::Initialize() {}
 
+absl::Status GraphicsEditor::Load() {
+
+  return absl::OkStatus();
+}
+
 absl::Status GraphicsEditor::Update() {
   if (ImGui::BeginTabBar("##TabBar")) {
     status_ = UpdateGfxEdit();

src/app/editor/graphics/graphics_editor.h

@@ -59,6 +59,7 @@ class GraphicsEditor : public SharedRom, public Editor {
   GraphicsEditor() { type_ = EditorType::kGraphics; }
 
   void Initialize() override;
+  absl::Status Load() override;
   absl::Status Update() override;
   absl::Status Undo() override { return absl::UnimplementedError("Undo"); }
   absl::Status Redo() override { return absl::UnimplementedError("Redo"); }

src/app/editor/graphics/palette_editor.cc

@@ -172,7 +172,7 @@ absl::Status DisplayPalette(gfx::SnesPalette& palette, bool loaded) {
 
 void PaletteEditor::Initialize() {}
 
-absl::Status PaletteEditor::Update() {
+absl::Status PaletteEditor::Load() {
   if (rom()->is_loaded()) {
     // Initialize the labels
     for (int i = 0; i < kNumPalettes; i++) {
@@ -183,7 +183,10 @@ absl::Status PaletteEditor::Update() {
   } else {
     return absl::NotFoundError("ROM not open, no palettes to display");
   }
+  return absl::OkStatus();
+}
 
+absl::Status PaletteEditor::Update() {
   if (BeginTable("paletteEditorTable", 2, kPaletteTableFlags, ImVec2(0, 0))) {
     TableSetupColumn("Palette Groups", ImGuiTableColumnFlags_WidthStretch,
                      GetContentRegionAvail().x);

src/app/editor/graphics/palette_editor.h

@@ -85,9 +85,8 @@ class PaletteEditor : public SharedRom, public Editor {
   }
 
   void Initialize() override;
-
+  absl::Status Load() override;
   absl::Status Update() override;
-
   absl::Status Cut() override { return absl::OkStatus(); }
   absl::Status Copy() override { return absl::OkStatus(); }
   absl::Status Paste() override { return absl::OkStatus(); }

src/app/editor/graphics/screen_editor.cc

@@ -28,6 +28,8 @@ constexpr uint32_t kRedPen = 0xFF0000FF;
 
 void ScreenEditor::Initialize() {}
 
+absl::Status ScreenEditor::Load() { return absl::OkStatus(); }
+
 absl::Status ScreenEditor::Update() {
   if (ImGui::BeginTabBar("##ScreenEditorTabBar")) {
     if (ImGui::BeginTabItem("Dungeon Maps")) {

src/app/editor/graphics/screen_editor.h

@@ -39,9 +39,8 @@ class ScreenEditor : public SharedRom, public Editor {
   }
 
   void Initialize() override;
-
+  absl::Status Load() override;
   absl::Status Update() override;
-
   absl::Status Undo() override { return absl::UnimplementedError("Undo"); }
   absl::Status Redo() override { return absl::UnimplementedError("Redo"); }
   absl::Status Cut() override { return absl::UnimplementedError("Cut"); }