Merge branch 'tm_ui_jobs'

src/libslic3r/MTUtils.hpp

@@ -5,6 +5,7 @@
 #include <mutex>        // for std::lock_guard
 #include <functional>   // for std::function
 #include <utility>      // for std::forward
+#include <algorithm>
 
 namespace Slic3r {
 
@@ -182,6 +183,14 @@ public:
     inline bool empty() const { return size() == 0; }
 };
 
+template<class C> bool all_of(const C &container) {
+    return std::all_of(container.begin(),
+                       container.end(),
+                       [](const typename C::value_type &v) {
+                           return static_cast<bool>(v);
+                       });
+}
+
 }
 
 #endif // MTUTILS_HPP

src/libslic3r/SLA/SLARotfinder.cpp

@@ -44,7 +44,7 @@ std::array<double, 3> find_best_rotation(const ModelObject& modelobj,
     // call the status callback in each iteration but the actual value may be
     // the same for subsequent iterations (status goes from 0 to 100 but
     // iterations can be many more)
-    auto objfunc = [&emesh, &status, &statuscb, max_tries]
+    auto objfunc = [&emesh, &status, &statuscb, &stopcond, max_tries]
             (double rx, double ry, double rz)
     {
         EigenMesh3D& m = emesh;
@@ -91,7 +91,7 @@ std::array<double, 3> find_best_rotation(const ModelObject& modelobj,
         }
 
         // report status
-        statuscb( unsigned(++status * 100.0/max_tries) );
+        if(!stopcond()) statuscb( unsigned(++status * 100.0/max_tries) );
 
         return score;
     };

src/slic3r/GUI/MainFrame.cpp

@@ -54,7 +54,7 @@ DPIFrame(NULL, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_S
 #endif // _WIN32
 
 	// initialize status bar
-	m_statusbar = new ProgressStatusBar(this);
+	m_statusbar.reset(new ProgressStatusBar(this));
 	m_statusbar->embed(this);
     m_statusbar->set_status_text(_(L("Version")) + " " +
 		SLIC3R_VERSION +
@@ -104,6 +104,8 @@ DPIFrame(NULL, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_S
             return;
         }
         
+        if(m_plater) m_plater->stop_jobs();
+
         // Weird things happen as the Paint messages are floating around the windows being destructed.
         // Avoid the Paint messages by hiding the main window.
         // Also the application closes much faster without these unnecessary screen refreshes.
@@ -138,6 +140,8 @@ DPIFrame(NULL, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_S
     update_ui_from_settings();    // FIXME (?)
 }
 
+MainFrame::~MainFrame() = default;
+
 void MainFrame::update_title()
 {
     wxString title = wxEmptyString;

src/slic3r/GUI/MainFrame.hpp

@@ -89,7 +89,7 @@ protected:
 
 public:
     MainFrame();
-    ~MainFrame() {}
+    ~MainFrame();
 
     Plater*     plater() { return m_plater; }
 
@@ -126,7 +126,7 @@ public:
     Plater*             m_plater { nullptr };
     wxNotebook*         m_tabpanel { nullptr };
     wxProgressDialog*   m_progress_dialog { nullptr };
-    ProgressStatusBar*  m_statusbar { nullptr };
+    std::unique_ptr<ProgressStatusBar>  m_statusbar;
 };
 
 } // GUI

src/slic3r/GUI/Plater.cpp

@@ -5,6 +5,7 @@
 #include <vector>
 #include <string>
 #include <regex>
+#include <future>
 #include <boost/algorithm/string.hpp>
 #include <boost/optional.hpp>
 #include <boost/filesystem/path.hpp>
@@ -1253,8 +1254,220 @@ struct Plater::priv
     Preview *preview;
 
     BackgroundSlicingProcess    background_process;
-    bool                        arranging;
-    bool                        rotoptimizing;
+    
+    // A class to handle UI jobs like arranging and optimizing rotation.
+    // These are not instant jobs, the user has to be informed about their
+    // state in the status progress indicator. On the other hand they are 
+    // separated from the background slicing process. Ideally, these jobs should
+    // run when the background process is not running.
+    //
+    // TODO: A mechanism would be useful for blocking the plater interactions:
+    // objects would be frozen for the user. In case of arrange, an animation
+    // could be shown, or with the optimize orientations, partial results
+    // could be displayed.
+    class Job: public wxEvtHandler {
+        int m_range = 100;
+        std::future<void> m_ftr;
+        priv *m_plater = nullptr;
+        std::atomic<bool> m_running {false}, m_canceled {false};
+        bool m_finalized = false;
+        
+        void run() { 
+            m_running.store(true); process(); m_running.store(false); 
+            
+            // ensure to call the last status to finalize the job
+            update_status(status_range(), "");
+        }
+        
+    protected:
+        
+        // status range for a particular job
+        virtual int status_range() const { return 100; }
+        
+        // status update, to be used from the work thread (process() method)
+        void update_status(int st, const wxString& msg = "") { 
+            auto evt = new wxThreadEvent(); evt->SetInt(st); evt->SetString(msg);
+            wxQueueEvent(this, evt); 
+        }
+        
+        priv& plater() { return *m_plater; }
+        bool was_canceled() const { return m_canceled.load(); }
+        
+        // Launched just before start(), a job can use it to prepare internals
+        virtual void prepare() {}
+        
+        // Launched when the job is finished. It refreshes the 3dscene by def.
+        virtual void finalize() {
+            // Do a full refresh of scene tree, including regenerating
+            // all the GLVolumes. FIXME The update function shall just
+            // reload the modified matrices.
+            if(! was_canceled())
+                plater().update(true);
+        }
+        
+    public:
+        
+        Job(priv *_plater): m_plater(_plater)
+        {
+            Bind(wxEVT_THREAD, [this](const wxThreadEvent& evt){
+                auto msg = evt.GetString();
+                if(! msg.empty()) plater().statusbar()->set_status_text(msg);
+                
+                if(m_finalized) return;
+                
+                plater().statusbar()->set_progress(evt.GetInt());
+                if(evt.GetInt() == status_range()) {
+                    
+                    // set back the original range and cancel callback
+                    plater().statusbar()->set_range(m_range);
+                    plater().statusbar()->set_cancel_callback();
+                    wxEndBusyCursor();
+                    
+                    finalize();
+                    
+                    // dont do finalization again for the same process
+                    m_finalized = true;
+                }
+            });
+        }
+        
+        Job(const Job&) = delete;
+        Job(Job&&) = default;
+        Job& operator=(const Job&) = delete;
+        Job& operator=(Job&&) = default;
+        
+        virtual void process() = 0;
+        
+        void start() { // Start the job. No effect if the job is already running
+            if(! m_running.load()) {
+                
+                prepare();                
+                
+                // Save the current status indicatior range and push the new one
+                m_range = plater().statusbar()->get_range();
+                plater().statusbar()->set_range(status_range());
+                
+                // init cancellation flag and set the cancel callback
+                m_canceled.store(false);
+                plater().statusbar()->set_cancel_callback( [this](){ 
+                    m_canceled.store(true);
+                });
+                
+                m_finalized = false;
+                
+                // Changing cursor to busy
+                wxBeginBusyCursor();
+                
+                try {   // Execute the job
+                    m_ftr = std::async(std::launch::async, &Job::run, this);
+                } catch(std::exception& ) { 
+                    update_status(status_range(), 
+                    _(L("ERROR: not enough resources to execute a new job.")));
+                }
+                
+                // The state changes will be undone when the process hits the
+                // last status value, in the status update handler (see ctor)
+            }
+        }
+        
+        // To wait for the running job and join the threads. False is returned
+        // if the timeout has been reached and the job is still running. Call
+        // cancel() before this fn if you want to explicitly end the job.
+        bool join(int timeout_ms = 0) const { 
+            if(!m_ftr.valid()) return true;
+            
+            if(timeout_ms <= 0) 
+                m_ftr.wait();
+            else if(m_ftr.wait_for(std::chrono::milliseconds(timeout_ms)) == 
+                    std::future_status::timeout) 
+                return false;
+            
+            return true;
+        }
+        
+        bool is_running() const { return m_running.load(); }
+        void cancel() { m_canceled.store(true); }
+    };
+    
+    enum class Jobs : size_t {
+        Arrange,
+        Rotoptimize
+    };
+    
+    // Jobs defined inside the group class will be managed so that only one can
+    // run at a time. Also, the background process will be stopped if a job is
+    // started.
+    class ExclusiveJobGroup {
+        
+        static const int ABORT_WAIT_MAX_MS = 10000;
+        
+        priv * m_plater;
+
+        class ArrangeJob : public Job
+        {
+            int count = 0;
+
+        protected:
+            void prepare() override
+            {
+                count = 0;
+                for (auto obj : plater().model.objects)
+                    count += int(obj->instances.size());
+            }
+
+        public:
+            using Job::Job;
+            int  status_range() const override { return count; }
+            void set_count(int c) { count = c; }
+            void process() override;
+        } arrange_job{m_plater};
+
+        class RotoptimizeJob : public Job
+        {
+        public:
+            using Job::Job;
+            void process() override;
+        } rotoptimize_job{m_plater};
+
+        std::vector<std::reference_wrapper<Job>> m_jobs{arrange_job,
+                                                        rotoptimize_job};
+
+    public:
+        
+        ExclusiveJobGroup(priv *_plater): m_plater(_plater) {}
+        
+        void start(Jobs jid) {
+            m_plater->background_process.stop();
+            stop_all();
+            m_jobs[size_t(jid)].get().start();
+        }
+        
+        void cancel_all() { for (Job& j : m_jobs) j.cancel(); }
+
+        void join_all(int wait_ms = 0)
+        {
+            std::vector<bool> aborted(m_jobs.size(), false);
+            
+            for (size_t jid = 0; jid < m_jobs.size(); ++jid)
+                aborted[jid] = m_jobs[jid].get().join(wait_ms);
+
+            if (!all_of(aborted))
+                BOOST_LOG_TRIVIAL(error) << "Could not abort a job!";
+        }
+        
+        void stop_all() { cancel_all(); join_all(ABORT_WAIT_MAX_MS); }
+        
+        const Job& get(Jobs jobid) const { return m_jobs[size_t(jobid)]; }
+
+        bool is_any_running() const
+        {
+            return std::any_of(m_jobs.begin(),
+                               m_jobs.end(),
+                               [](const Job &j) { return j.is_running(); });
+        }
+        
+    } m_ui_jobs{this};
+
     bool                        delayed_scene_refresh;
     std::string                 delayed_error_message;
 
@@ -1429,8 +1642,6 @@ Plater::priv::priv(Plater *q, MainFrame *main_frame)
 {
 	this->q->SetFont(Slic3r::GUI::wxGetApp().normal_font());
 
-    arranging = false;
-    rotoptimizing = false;
     background_process.set_fff_print(&fff_print);
 	background_process.set_sla_print(&sla_print);
     background_process.set_gcode_preview_data(&gcode_preview_data);
@@ -1605,7 +1816,7 @@ void Plater::priv::update_ui_from_settings()
 
 ProgressStatusBar* Plater::priv::statusbar()
 {
-    return main_frame->m_statusbar;
+    return main_frame->m_statusbar.get();
 }
 
 std::string Plater::priv::get_config(const std::string &key) const
@@ -2142,59 +2353,45 @@ void Plater::priv::mirror(Axis axis)
 
 void Plater::priv::arrange()
 {
-    if (arranging) { return; }
-    arranging = true;
-    Slic3r::ScopeGuard arranging_guard([this]() { arranging = false; });
+    m_ui_jobs.start(Jobs::Arrange);
+}
 
-    wxBusyCursor wait;
+// This method will find an optimal orientation for the currently selected item
+// Very similar in nature to the arrange method above...
+void Plater::priv::sla_optimize_rotation() {
+    m_ui_jobs.start(Jobs::Rotoptimize);
+}
 
-    this->background_process.stop();
+void Plater::priv::ExclusiveJobGroup::ArrangeJob::process() {
+    // TODO: we should decide whether to allow arrange when the search is
+    // running we should probably disable explicit slicing and background
+    // processing
 
-    unsigned count = 0;
-    for(auto obj : model.objects) count += obj->instances.size();
+    static const auto arrangestr = _(L("Arranging"));
 
-    auto prev_range = statusbar()->get_range();
-    statusbar()->set_range(count);
-
-    auto statusfn = [this, count] (unsigned st, const std::string& msg) {
-        /* // In case we would run the arrange asynchronously
-        wxCommandEvent event(EVT_PROGRESS_BAR);
-        event.SetInt(st);
-        event.SetString(msg);
-        wxQueueEvent(this->q, event.Clone()); */
-        statusbar()->set_progress(count - st);
-        statusbar()->set_status_text(_(msg));
-
-        // ok, this is dangerous, but we are protected by the flag
-        // 'arranging' and the arrange button is also disabled.
-        // This call is needed for the cancel button to work.
-        wxYieldIfNeeded();
-    };
-
-    statusbar()->set_cancel_callback([this, statusfn](){
-        arranging = false;
-        statusfn(0, L("Arranging canceled"));
-    });
-
-    static const std::string arrangestr = L("Arranging");
+    auto &config = plater().config;
+    auto &view3D = plater().view3D;
+    auto &model  = plater().model;
 
     // FIXME: I don't know how to obtain the minimum distance, it depends
     // on printer technology. I guess the following should work but it crashes.
-    double dist = 6; //PrintConfig::min_object_distance(config);
-    if(printer_technology == ptFFF) {
+    double dist = 6; // PrintConfig::min_object_distance(config);
+    if (plater().printer_technology == ptFFF) {
         dist = PrintConfig::min_object_distance(config);
     }
 
-    auto min_obj_distance = coord_t(dist/SCALING_FACTOR);
+    auto min_obj_distance = coord_t(dist / SCALING_FACTOR);
 
-    const auto *bed_shape_opt = config->opt<ConfigOptionPoints>("bed_shape");
+    const auto *bed_shape_opt = config->opt<ConfigOptionPoints>(
+        "bed_shape");
 
     assert(bed_shape_opt);
-    auto& bedpoints = bed_shape_opt->values;
-    Polyline bed; bed.points.reserve(bedpoints.size());
-    for(auto& v : bedpoints) bed.append(Point::new_scale(v(0), v(1)));
+    auto &   bedpoints = bed_shape_opt->values;
+    Polyline bed;
+    bed.points.reserve(bedpoints.size());
+    for (auto &v : bedpoints) bed.append(Point::new_scale(v(0), v(1)));
 
-    statusfn(0, arrangestr);
+    update_status(0, arrangestr);
 
     arr::WipeTowerInfo wti = view3D->get_canvas3d()->get_wipe_tower_info();
 
@@ -2210,129 +2407,116 @@ void Plater::priv::arrange()
                      bed,
                      hint,
                      false, // create many piles not just one pile
-                     [statusfn](unsigned st) { statusfn(st, arrangestr); },
-                     [this] () { return !arranging; });
-    } catch(std::exception& /*e*/) {
-        GUI::show_error(this->q, L("Could not arrange model objects! "
-                                   "Some geometries may be invalid."));
+                     [this](unsigned st) {
+                         if (st > 0)
+                             update_status(count - int(st), arrangestr);
+                     },
+                     [this]() { return was_canceled(); });
+    } catch (std::exception & /*e*/) {
+        GUI::show_error(plater().q,
+                        L("Could not arrange model objects! "
+                          "Some geometries may be invalid."));
     }
 
+    update_status(count,
+                  was_canceled() ? _(L("Arranging canceled."))
+                                 : _(L("Arranging done.")));
+
     // it remains to move the wipe tower:
     view3D->get_canvas3d()->arrange_wipe_tower(wti);
-
-    statusfn(0, L("Arranging done."));
-    statusbar()->set_range(prev_range);
-    statusbar()->set_cancel_callback(); // remove cancel button
-
-    // Do a full refresh of scene tree, including regenerating all the GLVolumes.
-    //FIXME The update function shall just reload the modified matrices.
-    update(true);
 }
 
-// This method will find an optimal orientation for the currently selected item
-// Very similar in nature to the arrange method above...
-void Plater::priv::sla_optimize_rotation() {
-
-    // TODO: we should decide whether to allow arrange when the search is
-    // running we should probably disable explicit slicing and background
-    // processing
-
-    if (rotoptimizing) { return; }
-    rotoptimizing = true;
-    Slic3r::ScopeGuard rotoptimizing_guard([this]() { rotoptimizing = false; });
-
-    int obj_idx = get_selected_object_idx();
+void Plater::priv::ExclusiveJobGroup::RotoptimizeJob::process()
+{
+    int obj_idx = plater().get_selected_object_idx();
     if (obj_idx < 0) { return; }
 
-    ModelObject * o = model.objects[size_t(obj_idx)];
-
-    background_process.stop();
-
-    auto prev_range = statusbar()->get_range();
-    statusbar()->set_range(100);
-
-    auto stfn = [this] (unsigned st, const std::string& msg) {
-        statusbar()->set_progress(int(st));
-        statusbar()->set_status_text(msg);
-
-        // could be problematic, but we need the cancel button.
-        wxYieldIfNeeded();
-    };
-
-    statusbar()->set_cancel_callback([this, stfn](){
-        rotoptimizing = false;
-        stfn(0, L("Orientation search canceled"));
-    });
+    ModelObject *o = plater().model.objects[size_t(obj_idx)];
 
     auto r = sla::find_best_rotation(
-                *o, .005f,
-                [stfn](unsigned s) { stfn(s, L("Searching for optimal orientation")); },
-                [this](){ return !rotoptimizing; }
-    );
+        *o,
+        .005f,
+        [this](unsigned s) {
+            if (s < 100)
+                update_status(int(s),
+                              _(L("Searching for optimal orientation")));
+        },
+        [this]() { return was_canceled(); });
 
-    const auto *bed_shape_opt = config->opt<ConfigOptionPoints>("bed_shape");
+    const auto *bed_shape_opt = plater().config->opt<ConfigOptionPoints>(
+        "bed_shape");
     assert(bed_shape_opt);
 
-    auto& bedpoints = bed_shape_opt->values;
-    Polyline bed; bed.points.reserve(bedpoints.size());
-    for(auto& v : bedpoints) bed.append(Point::new_scale(v(0), v(1)));
+    auto &   bedpoints = bed_shape_opt->values;
+    Polyline bed;
+    bed.points.reserve(bedpoints.size());
+    for (auto &v : bedpoints) bed.append(Point::new_scale(v(0), v(1)));
 
     double mindist = 6.0; // FIXME
-    double offs = mindist / 2.0 - EPSILON;
+    double offs    = mindist / 2.0 - EPSILON;
 
-    if(rotoptimizing) // wasn't canceled
-    for(ModelInstance * oi : o->instances) {
-        oi->set_rotation({r[X], r[Y], r[Z]});
+    if (!was_canceled()) // wasn't canceled
+        for (ModelInstance *oi : o->instances) {
+            oi->set_rotation({r[X], r[Y], r[Z]});
 
-        auto trchull = o->convex_hull_2d(oi->get_transformation().get_matrix());
+            auto trchull = o->convex_hull_2d(
+                oi->get_transformation().get_matrix());
 
-        namespace opt = libnest2d::opt;
-        opt::StopCriteria stopcr;
-        stopcr.relative_score_difference = 0.01;
-        stopcr.max_iterations = 10000;
-        stopcr.stop_score = 0.0;
-        opt::GeneticOptimizer solver(stopcr);
-        Polygon pbed(bed);
+            namespace opt = libnest2d::opt;
+            opt::StopCriteria stopcr;
+            stopcr.relative_score_difference = 0.01;
+            stopcr.max_iterations            = 10000;
+            stopcr.stop_score                = 0.0;
+            opt::GeneticOptimizer solver(stopcr);
+            Polygon               pbed(bed);
 
-        auto bin = pbed.bounding_box();
-        double binw = bin.size()(X) * SCALING_FACTOR - offs;
-        double binh = bin.size()(Y) * SCALING_FACTOR - offs;
+            auto   bin  = pbed.bounding_box();
+            double binw = bin.size()(X) * SCALING_FACTOR - offs;
+            double binh = bin.size()(Y) * SCALING_FACTOR - offs;
 
-        auto result = solver.optimize_min([&trchull, binw, binh](double rot){
-            auto chull = trchull;
-            chull.rotate(rot);
+            auto result = solver.optimize_min(
+                [&trchull, binw, binh](double rot) {
+                    auto chull = trchull;
+                    chull.rotate(rot);
 
-            auto bb = chull.bounding_box();
-            double bbw = bb.size()(X) * SCALING_FACTOR;
-            double bbh = bb.size()(Y) * SCALING_FACTOR;
+                    auto   bb  = chull.bounding_box();
+                    double bbw = bb.size()(X) * SCALING_FACTOR;
+                    double bbh = bb.size()(Y) * SCALING_FACTOR;
 
-            auto wdiff = bbw - binw;
-            auto hdiff = bbh - binh;
-            double diff = 0;
-            if(wdiff < 0 && hdiff < 0) diff = wdiff + hdiff;
-            if(wdiff > 0) diff += wdiff;
-            if(hdiff > 0) diff += hdiff;
+                    auto   wdiff = bbw - binw;
+                    auto   hdiff = bbh - binh;
+                    double diff  = 0;
+                    if (wdiff < 0 && hdiff < 0) diff = wdiff + hdiff;
+                    if (wdiff > 0) diff += wdiff;
+                    if (hdiff > 0) diff += hdiff;
 
-            return diff;
-        }, opt::initvals(0.0), opt::bound(-PI/2, PI/2));
+                    return diff;
+                },
+                opt::initvals(0.0),
+                opt::bound(-PI / 2, PI / 2));
 
-        double r = std::get<0>(result.optimum);
+            double r = std::get<0>(result.optimum);
 
-        Vec3d rt = oi->get_rotation(); rt(Z) += r;
-        oi->set_rotation(rt);
+            Vec3d rt = oi->get_rotation();
+            rt(Z) += r;
+            oi->set_rotation(rt);
+
+            arr::WipeTowerInfo wti; // useless in SLA context
+            arr::find_new_position(plater().model,
+                                   o->instances,
+                                   coord_t(mindist / SCALING_FACTOR),
+                                   bed,
+                                   wti);
+
+            // Correct the z offset of the object which was corrupted be
+            // the rotation
+            o->ensure_on_bed();
+            
+            update_status(100, _(L("Orientation found.")));
+        }
+    else {
+        update_status(100, _(L("Orientation search canceled.")));
     }
-
-    arr::WipeTowerInfo wti; // useless in SLA context
-    arr::find_new_position(model, o->instances, coord_t(mindist/SCALING_FACTOR), bed, wti);
-
-    // Correct the z offset of the object which was corrupted be the rotation
-    o->ensure_on_bed();
-
-    stfn(0, L("Orientation found."));
-    statusbar()->set_range(prev_range);
-    statusbar()->set_cancel_callback();
-
-    update(true);
 }
 
 void Plater::priv::split_object()
@@ -2513,7 +2697,7 @@ unsigned int Plater::priv::update_background_process(bool force_validation)
 // Restart background processing thread based on a bitmask of UpdateBackgroundProcessReturnState.
 bool Plater::priv::restart_background_process(unsigned int state)
 {
-    if (arranging || rotoptimizing) {
+    if (m_ui_jobs.is_any_running()) {
         // Avoid a race condition
         return false;
     }
@@ -2744,7 +2928,7 @@ void Plater::priv::on_select_preset(wxCommandEvent &evt)
 void Plater::priv::on_slicing_update(SlicingStatusEvent &evt)
 {
     if (evt.status.percent >= -1) {
-        if (arranging || rotoptimizing) {
+        if (m_ui_jobs.is_any_running()) {
             // Avoid a race condition
             return;
         }
@@ -3225,7 +3409,7 @@ bool Plater::priv::can_fix_through_netfabb() const
 
 bool Plater::priv::can_increase_instances() const
 {
-    if (arranging || rotoptimizing) {
+    if (m_ui_jobs.is_any_running()) {
         return false;
     }
 
@@ -3235,7 +3419,7 @@ bool Plater::priv::can_increase_instances() const
 
 bool Plater::priv::can_decrease_instances() const
 {
-    if (arranging || rotoptimizing) {
+    if (m_ui_jobs.is_any_running()) {
         return false;
     }
 
@@ -3255,7 +3439,7 @@ bool Plater::priv::can_split_to_volumes() const
 
 bool Plater::priv::can_arrange() const
 {
-    return !model.objects.empty() && !arranging;
+    return !model.objects.empty() && !m_ui_jobs.is_any_running();
 }
 
 bool Plater::priv::can_layers_editing() const
@@ -3383,6 +3567,8 @@ void Plater::load_files(const std::vector<std::string>& input_files, bool load_m
 
 void Plater::update() { p->update(); }
 
+void Plater::stop_jobs() { p->m_ui_jobs.stop_all(); }
+
 void Plater::update_ui_from_settings() { p->update_ui_from_settings(); }
 
 void Plater::select_view(const std::string& direction) { p->select_view(direction); }
@@ -3689,7 +3875,7 @@ void Plater::export_3mf(const boost::filesystem::path& output_path)
     if (!path.Lower().EndsWith(".3mf"))
         return;
 
-	DynamicPrintConfig cfg = wxGetApp().preset_bundle->full_config_secure();
+    DynamicPrintConfig cfg = wxGetApp().preset_bundle->full_config_secure();
     const std::string path_u8 = into_u8(path);
     wxBusyCursor wait;
     if (Slic3r::store_3mf(path_u8.c_str(), &p->model, export_config ? &cfg : nullptr)) {
@@ -3705,6 +3891,9 @@ void Plater::export_3mf(const boost::filesystem::path& output_path)
 
 void Plater::reslice()
 {
+    // Stop arrange and (or) optimize rotation tasks.
+    this->stop_jobs();
+    
     //FIXME Don't reslice if export of G-code or sending to OctoPrint is running.
     // bitmask of UpdateBackgroundProcessReturnState
     unsigned int state = this->p->update_background_process(true);
@@ -3740,7 +3929,7 @@ void Plater::reslice_SLA_supports(const ModelObject &object)
     if (state & priv::UPDATE_BACKGROUND_PROCESS_REFRESH_SCENE)
         this->p->view3D->reload_scene(false);
 
-	if (this->p->background_process.empty() || (state & priv::UPDATE_BACKGROUND_PROCESS_INVALID))
+    if (this->p->background_process.empty() || (state & priv::UPDATE_BACKGROUND_PROCESS_INVALID))
         // Nothing to do on empty input or invalid configuration.
         return;
 

src/slic3r/GUI/Plater.hpp

@@ -144,6 +144,7 @@ public:
     void load_files(const std::vector<std::string>& input_files, bool load_model = true, bool load_config = true);
 
     void update();
+    void stop_jobs();
     void select_view(const std::string& direction);
     void select_view_3D(const std::string& name);
 

src/slic3r/GUI/ProgressStatusBar.cpp

@@ -168,6 +168,11 @@ void ProgressStatusBar::set_status_text(const char *txt)
     this->set_status_text(wxString::FromUTF8(txt));
 }
 
+wxString ProgressStatusBar::get_status_text() const
+{
+    return self->GetStatusText();
+}
+
 void ProgressStatusBar::show_cancel_button()
 {
     if(m_cancelbutton) m_cancelbutton->Show();

src/slic3r/GUI/ProgressStatusBar.hpp

@@ -52,6 +52,7 @@ public:
     void        set_status_text(const wxString& txt);
     void        set_status_text(const std::string& txt);
     void        set_status_text(const char *txt);
+    wxString    get_status_text() const;
 
     // Temporary methods to satisfy Perl side
     void        show_cancel_button();