Documentation of the UI config update functions,

documented missing AMF support for the variable layer thickness.

lib/Slic3r/GUI/MainFrame.pm

@@ -132,9 +132,9 @@ sub _init_tabpanel {
         $tab = $self->{options_tabs}{$tab_name} = ($class_prefix . ucfirst $tab_name)->new(
             $panel, 
             no_controller => $self->{no_controller});
+        # Callback to be executed after any of the configuration fields (Perl class Slic3r::GUI::OptionsGroup::Field) change their value.
         $tab->on_value_change(sub {
-            my ($opt_key, $value) = @_;
-            
+            my ($opt_key, $value) = @_;            
             my $config = $tab->config;
             if ($self->{plater}) {
                 $self->{plater}->on_config_change($config); # propagate config change events to the plater
@@ -158,6 +158,7 @@ sub _init_tabpanel {
         # a preset changes at Slic3r::GUI::Tab.
         $tab->on_presets_changed(sub {
             if ($self->{plater}) {
+                # Update preset combo boxes (Print settings, Filament, Printer) from their respective tabs.
                 $self->{plater}->update_presets($tab_name, @_);
                 $self->{plater}->on_config_change($tab->config);
                 if ($self->{controller}) {

lib/Slic3r/GUI/OptionsGroup.pm

@@ -389,6 +389,7 @@ sub append_single_option_line {
     return $self->append_line($self->create_single_option_line($option, $opt_index));
 }
 
+# Initialize UI components with the config values.
 sub reload_config {
     my ($self) = @_;
     

lib/Slic3r/GUI/OptionsGroup/Field.pm

@@ -1,12 +1,17 @@
+# An input field class prototype.
 package Slic3r::GUI::OptionsGroup::Field;
 use Moo;
 
 # This is a base class for option fields.
 
 has 'parent'                => (is => 'ro', required => 1);
-has 'option'                => (is => 'ro', required => 1);     # Slic3r::GUI::OptionsGroup::Option
+# Slic3r::GUI::OptionsGroup::Option
+has 'option'                => (is => 'ro', required => 1);
+# On change callback
 has 'on_change'             => (is => 'rw', default => sub { sub {} });
 has 'on_kill_focus'         => (is => 'rw', default => sub { sub {} });
+# If set, the callback $self->on_change is not called.
+# This is used to avoid recursive invocation of the field change/update by wxWidgets.
 has 'disable_change_event'  => (is => 'rw', default => sub { 0 });
 
 # This method should not fire the on_change event

lib/Slic3r/GUI/Plater.pm

@@ -54,7 +54,9 @@ sub new {
         bed_shape complete_objects extruder_clearance_radius skirts skirt_distance brim_width
         serial_port serial_speed octoprint_host octoprint_apikey
     ));
+    # C++ Slic3r::Model with Perl extensions in Slic3r/Model.pm
     $self->{model} = Slic3r::Model->new;
+    # C++ Slic3r::Print with Perl extensions in Slic3r/Print.pm
     $self->{print} = Slic3r::Print->new;
     # List of Perl objects Slic3r::GUI::Plater::Object, representing a 2D preview of the platter.
     $self->{objects} = [];
@@ -498,7 +500,7 @@ sub update_ui_from_settings
     }
 }
 
-# Update presets (Print settings, Filament, Printer) from their respective tabs.
+# Update preset combo boxes (Print settings, Filament, Printer) from their respective tabs.
 # Called by 
 #       Slic3r::GUI::Tab::Print::_on_presets_changed
 #       Slic3r::GUI::Tab::Filament::_on_presets_changed

lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm

@@ -21,8 +21,10 @@ sub new {
     my ($parent, %params) = @_;
     my $self = $class->SUPER::new($parent, -1, wxDefaultPosition, wxDefaultSize, wxTAB_TRAVERSAL);
     
-    my $object = $self->{model_object} = $params{model_object};
-    my $print_object = $self->{print_object} = $params{print_object};
+    # C++ type Slic3r::ModelObject
+    $self->{model_object} = $params{model_object};
+    # Not set, not used.
+    # $self->{print_object} = $params{print_object};
     
     # create TreeCtrl
     my $tree = $self->{tree} = Wx::TreeCtrl->new($self, -1, wxDefaultPosition, [300, 100], 

lib/Slic3r/GUI/Plater/ObjectSettingsDialog.pm

@@ -11,6 +11,9 @@ use Wx qw(:dialog :id :misc :sizer :systemsettings :notebook wxTAB_TRAVERSAL);
 use Wx::Event qw(EVT_BUTTON);
 use base 'Wx::Dialog';
 
+# Called with
+# %params{object} of a Perl type Slic3r::GUI::Plater::Object
+# %params{model_object} of a C++ type Slic3r::ModelObject
 sub new {
     my $class = shift;
     my ($parent, %params) = @_;
@@ -59,6 +62,7 @@ use base 'Wx::Panel';
 
 sub model_object {
     my ($self) = @_;
+    # $self->GetParent->GetParent is of type Slic3r::GUI::Plater::ObjectSettingsDialog
     return $self->GetParent->GetParent->{model_object};
 }
 

lib/Slic3r/GUI/Plater/OverrideSettingsPanel.pm

@@ -20,8 +20,10 @@ sub new {
     my $class = shift;
     my ($parent, %params) = @_;
     my $self = $class->SUPER::new($parent, -1, wxDefaultPosition, wxDefaultSize, wxTAB_TRAVERSAL);
+    # C++ class Slic3r::DynamicPrintConfig, initially empty.
     $self->{default_config} = Slic3r::Config->new;
     $self->{config} = Slic3r::Config->new;
+    # On change callback.
     $self->{on_change} = $params{on_change};
     $self->{fixed_options} = {};