Add document resize service boundary

src/app_core/document_resize.h

@@ -21,6 +21,15 @@ struct DocumentResizePlan {
     bool clears_history = false;
 };
 
+class DocumentResizeServices {
+public:
+    virtual ~DocumentResizeServices() = default;
+
+    virtual void resize_document(int width, int height) = 0;
+    virtual void update_title() = 0;
+    virtual void clear_history() = 0;
+};
+
 [[nodiscard]] inline DocumentResizeDialogState make_document_resize_dialog_state(
     int current_resolution)
 {
@@ -54,4 +63,20 @@ struct DocumentResizePlan {
         });
 }
 
+[[nodiscard]] inline pp::foundation::Status execute_document_resize_plan(
+    const DocumentResizePlan& plan,
+    DocumentResizeServices& services)
+{
+    if (plan.width <= 0 || plan.height <= 0) {
+        return pp::foundation::Status::out_of_range("resize dimensions must be positive");
+    }
+
+    services.resize_document(plan.width, plan.height);
+    services.update_title();
+    if (plan.clears_history) {
+        services.clear_history();
+    }
+    return pp::foundation::Status::success();
+}
+
 }

src/app_dialogs.cpp

@@ -550,6 +550,33 @@ void App::dialog_export_depth()
 
 void App::dialog_resize()
 {
+    class LegacyDocumentResizeServices final : public pp::app::DocumentResizeServices {
+    public:
+        explicit LegacyDocumentResizeServices(App& app) noexcept
+            : app_(app)
+        {
+        }
+
+        void resize_document(int width, int height) override
+        {
+            if (app_.canvas)
+                app_.canvas->m_canvas->resize(width, height);
+        }
+
+        void update_title() override
+        {
+            app_.title_update();
+        }
+
+        void clear_history() override
+        {
+            ActionManager::clear();
+        }
+
+    private:
+        App& app_;
+    };
+
     auto dialog = std::make_shared<NodeDialogResize>();
     dialog->set_manager(&layout);
     dialog->init();
@@ -567,10 +594,10 @@ void App::dialog_resize()
             dialog->destroy();
             return;
         }
-        if (canvas)
-            canvas->m_canvas->resize(plan.value().width, plan.value().height);
-        App::I->title_update();
-        ActionManager::clear();
+        LegacyDocumentResizeServices services(*this);
+        const auto status = pp::app::execute_document_resize_plan(plan.value(), services);
+        if (!status.ok())
+            LOG("Document resize failed: %s", status.message);
         dialog->destroy();
     };
 }