Cancellation of parameter page build process.

src/slic3r/GUI/OptionsGroup.cpp

@@ -362,11 +362,12 @@ void OptionsGroup::activate_line(Line& line)
 }
 
 // create all controls for the option group from the m_lines
-bool OptionsGroup::activate()
+bool OptionsGroup::activate(std::function<void()> throw_if_canceled)
 {
 	if (sizer)//(!sizer->IsEmpty())
 		return false;
 
+	try {
 		if (staticbox) {
 			stb = new wxStaticBox(m_parent, wxID_ANY, _(title));
 			if (!wxOSX) stb->SetBackgroundStyle(wxBG_STYLE_PAINT);
@@ -396,8 +397,17 @@ bool OptionsGroup::activate()
 		sizer->Add(m_grid_sizer, 0, wxEXPAND | wxALL, wxOSX || !staticbox ? 0 : 5);
 
 		// activate lines
-	for (Line& line: m_lines)
+		for (Line& line: m_lines) {
+			throw_if_canceled();
 			activate_line(line);
+		}
+	} catch (UIBuildCanceled&) {
+		auto p = sizer;
+		this->clear();
+		p->Clear(true);
+		delete p;
+		throw;
+	}
 
 	return true;
 }

src/slic3r/GUI/OptionsGroup.hpp

@@ -24,6 +24,9 @@
 
 namespace Slic3r { namespace GUI {
 
+// Thrown if the building of a parameter page is canceled.
+class UIBuildCanceled : public std::exception {};
+
 /// Widget type describes a function object that returns a wxWindow (our widget) and accepts a wxWidget (parent window).
 using widget_t = std::function<wxSizer*(wxWindow*)>;//!std::function<wxWindow*(wxWindow*)>;
 
@@ -124,7 +127,7 @@ public:
 	void		activate_line(Line& line);
 
 	// create all controls for the option group from the m_lines
-	bool		activate();
+	bool		activate(std::function<void()> throw_if_canceled = [](){});
 	// delete all controls from the option group
 	void		clear();
 

src/slic3r/GUI/Tab.cpp

@@ -297,15 +297,28 @@ void Tab::create_preset_tab()
     // This helps to process all the cursor key events on Windows in the tree control,
     // so that the cursor jumps to the last item.
     m_treectrl->Bind(wxEVT_TREE_SEL_CHANGED, [this](wxTreeEvent&) {
-            if (!m_disable_tree_sel_changed_event && !m_pages.empty())
+            if (!m_disable_tree_sel_changed_event && !m_pages.empty()) {
+                if (m_page_switch_running)
                     m_page_switch_planned = true;
+                else {
+                    m_page_switch_running = true;
+                    do {
+                        m_page_switch_planned = false;
+                    } while (this->tree_sel_change_delayed());
+                    m_page_switch_running = false;
+                }
+            }
+            m_treectrl->Update();
         });
+#if 0
     m_treectrl->Bind(wxEVT_IDLE, [this](wxIdleEvent&) {
             if (m_page_switch_planned) {
-            	this->tree_sel_change_delayed();
+                do {
                     m_page_switch_planned = false;
+                }  while (this->tree_sel_change_delayed());
             }
         });
+#endif
 
     m_treectrl->Bind(wxEVT_KEY_DOWN, &Tab::OnKeyDown, this);
 
@@ -424,7 +437,7 @@ void Tab::OnActivate()
 #endif // __WXOSX__
 
     // create controls on active page
-    active_selected_page();
+    activate_selected_page();
 //    m_active_page->Show();
     m_hsizer->Layout();
     Refresh();
@@ -2820,9 +2833,9 @@ void TabPrinter::update_pages()
     rebuild_page_tree();
 }
 
-void TabPrinter::active_selected_page()
+void TabPrinter::activate_selected_page(std::function<void()> throw_if_canceled)
 {
-    Tab::active_selected_page();
+    Tab::activate_selected_page(throw_if_canceled);
 
     // "extruders_count" doesn't update from the update_config(),
     // so update it implicitly
@@ -3372,19 +3385,20 @@ void Tab::update_description_lines()
         update_preset_description_line();
 }
 
-void Tab::active_selected_page()
+void Tab::activate_selected_page(std::function<void()> throw_if_canceled)
 {
     if (!m_active_page)
         return;
 
-    m_active_page->activate(m_mode);
+    m_active_page->activate(m_mode, throw_if_canceled);
     update_changed_ui();
     update_description_lines();
     toggle_options();
 }
 
-void Tab::tree_sel_change_delayed()
+bool Tab::tree_sel_change_delayed()
 {
+#if 1
 	// There is a bug related to Ubuntu overlay scrollbars, see https://github.com/prusa3d/PrusaSlicer/issues/898 and https://github.com/prusa3d/PrusaSlicer/issues/952.
 	// The issue apparently manifests when Show()ing a window with overlay scrollbars while the UI is frozen. For this reason,
 	// we will Thaw the UI prematurely on Linux. This means destroing the no_updates object prematurely.
@@ -3398,6 +3412,7 @@ void Tab::tree_sel_change_delayed()
 //#ifdef __WXOSX__  // Use Freeze/Thaw to avoid flickering during clear/activate new page
 	wxWindowUpdateLocker noUpdates(this);
 //#endif
+#endif
 #endif
 
     Page* page = nullptr;
@@ -3411,18 +3426,30 @@ void Tab::tree_sel_change_delayed()
             m_is_modified_values = page->m_is_modified_values;
             break;
         }
-    if (page == nullptr || m_active_page == page) return;
+    if (page == nullptr || m_active_page == page)
+        return false;
 
     // clear pages from the controls
     m_active_page = page;
+    
+    auto throw_if_canceled = std::function<void()>([this](){
+#ifdef WIN32
+            wxCheckForInterrupt(m_treectrl);
+            if (m_page_switch_planned)
+                throw UIBuildCanceled();
+#endif // WIN32
+        });
+
+    try {
         clear_pages();
+        throw_if_canceled();
 
         //for (auto& el : m_pages)
         //    el.get()->Hide();
 
         if (wxGetApp().mainframe->is_active_and_shown_tab(this)) {
-        active_selected_page();
+            activate_selected_page(throw_if_canceled);
-//        m_active_page->Show();
+    //        m_active_page->Show();
         }
 
         #ifdef __linux__
@@ -3430,10 +3457,19 @@ void Tab::tree_sel_change_delayed()
         #endif
 
         update_undo_buttons();
+        throw_if_canceled();
 
-//    m_active_page->Show();
+    //    m_active_page->Show();
         m_hsizer->Layout();
+        throw_if_canceled();
         Refresh();
+    } catch (const UIBuildCanceled&) {
+	    if (m_active_page)
+		    m_active_page->clear();
+        return true;
+    }
+
+    return false;
 }
 
 void Tab::OnKeyDown(wxKeyEvent& event)
@@ -3892,16 +3928,17 @@ void Page::update_visibility(ConfigOptionMode mode, bool update_contolls_visibil
     m_show = ret_val;
 }
 
-void Page::activate(ConfigOptionMode mode)
+void Page::activate(ConfigOptionMode mode, std::function<void()> throw_if_canceled)
 {
     //if (m_parent)
     //m_parent->SetSizer(m_vsizer);
     for (auto group : m_optgroups) {
-        if (!group->activate())
+        if (!group->activate(throw_if_canceled))
             continue;
         m_vsizer->Add(group->sizer, 0, wxEXPAND | wxALL, 10);
         group->update_visibility(mode);
         group->reload_config();
+        throw_if_canceled();
     }
 }
 

src/slic3r/GUI/Tab.hpp

@@ -73,7 +73,7 @@ public:
 	void		set_config(DynamicPrintConfig* config_in) { m_config = config_in; }
 	void		reload_config();
     void        update_visibility(ConfigOptionMode mode, bool update_contolls_visibility);
-    void        activate(ConfigOptionMode mode);
+    void        activate(ConfigOptionMode mode, std::function<void()> throw_if_canceled);
     void        clear();
     void        msw_rescale();
     void        sys_color_changed();
@@ -239,6 +239,7 @@ protected:
 	DynamicPrintConfig 	m_cache_config;
 
 
+	bool				m_page_switch_running = false;
 	bool				m_page_switch_planned = false;
 
 public:
@@ -294,7 +295,7 @@ public:
 
     virtual void    clear_pages();
     virtual void    update_description_lines();
-    virtual void    active_selected_page();
+    virtual void    activate_selected_page(std::function<void()> throw_if_canceled);
 
 	void		OnTreeSelChange(wxTreeEvent& event);
 	void		OnKeyDown(wxKeyEvent& event);
@@ -354,7 +355,8 @@ protected:
 	void 			compatible_widget_reload(PresetDependencies &deps);
 	void			load_key_value(const std::string& opt_key, const boost::any& value, bool saved_value = false);
 
-	void			tree_sel_change_delayed();
+	// return true if cancelled
+	bool			tree_sel_change_delayed();
 	void			on_presets_changed();
 	void			build_preset_description_line(ConfigOptionsGroup* optgroup);
 	void			update_preset_description_line();
@@ -447,7 +449,7 @@ public:
 	void		build() override;
     void		build_fff();
     void		build_sla();
-	void		active_selected_page() override;
+	void		activate_selected_page(std::function<void()> throw_if_canceled) override;
 	void		clear_pages() override;
 	void		toggle_options() override;
     void		update() override;