improve progress bar, refactor node destruction, simplify layers export

src/app_cloud.cpp

@@ -31,7 +31,7 @@ void App::cloud_upload()
             auto pb = show_progress("Uploading");
 
             upload(doc_path, doc_filename, [this,pb](float p){
-                pb->m_progress->SetWidthP(p * 100.f);
+                pb->set_progress(p);
             });
             
             pb->destroy();
@@ -70,32 +70,20 @@ void App::cloud_upload_all()
         gl_state gl;
         std::shared_ptr<NodeProgressBar> pb;
         if (layout.m_loaded)
-        {
-            pb = show_progress("Export Pano Image");
-        }
-
-        int progress = 0;
-        int total = (int)names.size();
+            pb = show_progress("Export Pano Image", names.size());
 
         for (const auto& n : names)
         {
             std::string path = data_path + "/" + n;
             upload(path);
 
-            progress++;
-            float p = (float)progress / total * 100.f;
-            LOG("progress: %f", p);
-
             if (layout.m_loaded)
-            {
-                pb->m_progress->SetWidthP(p);
-            }
+                pb->increment();
         }
 
         if (layout.m_loaded)
-        {
             pb->destroy();
-        }
+
     }).detach();
 }