add save dialog to specify file name

engine/app_layout.cpp

@@ -283,7 +283,20 @@ void App::initLayout()
             button->on_click = [this,button](Node*) {
                 if (canvas)
                 {
-                    canvas->m_canvas->project_save(data_path);
+                    auto dialog = std::make_shared<NodeDialogSave>();
+                    dialog->m_manager = &layout;
+                    dialog->init();
+                    dialog->create();
+                    dialog->loaded();
+
+                    layout[main_id]->add_child(dialog);
+                    layout[main_id]->update();
+
+                    dialog->btn_ok->on_click = [this, dialog](Node*)
+                    {
+                        canvas->m_canvas->project_save(data_path + "/" + dialog->input->m_string + ".pano");
+                        dialog->destroy(); 
+                    };
                 }
             };
         }