In export format dialog, show preview of generated part of description. Fix to #0004941

git-svn-id: svn://localhost/ardour2/branches/3.0@12911 d708f5d6-7413-0410-9779-e7cbd77b26cf

4 files changed, 35 insertions, 5 deletions

diff --git a/libs/ardour/ardour/export_format_manager.h b/libs/ardour/ardour/export_format_manager.h
index 33a5553203..2b5d0ad804 100644
--- a/libs/ardour/ardour/export_format_manager.h
+++ b/libs/ardour/ardour/export_format_manager.h
@@ -85,6 +85,7 @@ class ExportFormatManager : public PBD::ScopedConnectionList
 	/* Signals */
 
 	PBD::Signal1<void,bool> CompleteChanged;
+	PBD::Signal0<void> DescriptionChanged;
 
 	/* Access to lists */
 
@@ -142,6 +143,7 @@ class ExportFormatManager : public PBD::ScopedConnectionList
 
 	bool pending_selection_change;
 	void selection_changed ();
+	void check_for_description_change ();
 
 	/* Formats and compatibilities */
 
@@ -154,13 +156,15 @@ class ExportFormatManager : public PBD::ScopedConnectionList
 	ExportFormatBasePtr get_compatibility_intersection ();
 
 	ExportFormatBasePtr   universal_set;
-	ExportFormatSpecPtr         current_selection;
+	ExportFormatSpecPtr   current_selection;
 
 	CompatList      compatibilities;
 	QualityList     qualities;
 	FormatList      formats;
 	SampleRateList  sample_rates;
 
+	std::string     prev_description;
+
 };
 
 } // namespace ARDOUR
diff --git a/libs/ardour/ardour/export_format_specification.h b/libs/ardour/ardour/export_format_specification.h
index 4bf3ed4013..286aa58353 100644
--- a/libs/ardour/ardour/export_format_specification.h
+++ b/libs/ardour/ardour/export_format_specification.h
@@ -103,7 +103,7 @@ class ExportFormatSpecification : public ExportFormatBase {
 
 	PBD::UUID const & id () { return _id; }
 	std::string const & name () const { return _name; }
-	std::string description ();
+	std::string description (bool include_name = true);
 
 	bool has_broadcast_info () const { return _has_broadcast_info; }
 	uint32_t channel_limit () const { return _channel_limit; }
diff --git a/libs/ardour/export_format_manager.cc b/libs/ardour/export_format_manager.cc
index ff115d4447..5bb04696b9 100644
--- a/libs/ardour/export_format_manager.cc
+++ b/libs/ardour/export_format_manager.cc
@@ -40,6 +40,8 @@ ExportFormatManager::ExportFormatManager (ExportFormatSpecPtr specification) :
 	init_qualities ();
 	init_formats ();
 	init_sample_rates ();
+
+	prev_description = current_selection->description();
 }
 
 ExportFormatManager::~ExportFormatManager ()
@@ -255,66 +257,77 @@ void
 ExportFormatManager::set_name (string name)
 {
 	current_selection->set_name (name);
+	check_for_description_change ();
 }
 
 void
 ExportFormatManager::select_src_quality (ExportFormatBase::SRCQuality value)
 {
 	current_selection->set_src_quality (value);
+	check_for_description_change ();
 }
 
 void
 ExportFormatManager::select_with_cue (bool value)
 {
 	current_selection->set_with_cue (value);
+	check_for_description_change ();
 }
 
 void
 ExportFormatManager::select_with_toc (bool value)
 {
 	current_selection->set_with_toc (value);
+	check_for_description_change ();
 }
 
 void
 ExportFormatManager::select_trim_beginning (bool value)
 {
 	current_selection->set_trim_beginning (value);
+	check_for_description_change ();
 }
 
 void
 ExportFormatManager::select_silence_beginning (AnyTime const & time)
 {
 	current_selection->set_silence_beginning (time);
+	check_for_description_change ();
 }
 
 void
 ExportFormatManager::select_trim_end (bool value)
 {
 	current_selection->set_trim_end (value);
+	check_for_description_change ();
 }
 
 void
 ExportFormatManager::select_silence_end (AnyTime const & time)
 {
 	current_selection->set_silence_end (time);
+	check_for_description_change ();
 }
 
 void
 ExportFormatManager::select_normalize (bool value)
 {
 	current_selection->set_normalize (value);
+	check_for_description_change ();
 }
 
 void
 ExportFormatManager::select_normalize_target (float value)
 {
 	current_selection->set_normalize_target (value);
+	check_for_description_change ();
 }
 
 void
 ExportFormatManager::select_tagging (bool tag)
 {
 	current_selection->set_tag (tag);
+	check_for_description_change ();
 }
 
 void
@@ -694,15 +707,26 @@ ExportFormatManager::selection_changed ()
 
 	}
 
-	/* Signal completeness */
+	/* Signal completeness and possible description change */
 
 	CompleteChanged (current_selection->is_complete());
+	check_for_description_change ();
 
 	/* Reset pending state */
 
 	pending_selection_change = false;
 }
 
+void
+ExportFormatManager::check_for_description_change ()
+{
+	std::string new_description = current_selection->description();
+	if (new_description == prev_description) { return; }
+
+	prev_description = new_description;
+	DescriptionChanged();
+}
+
 ExportFormatManager::QualityPtr
 ExportFormatManager::get_selected_quality ()
 {
diff --git a/libs/ardour/export_format_specification.cc b/libs/ardour/export_format_specification.cc
index 763f507de4..9e57b7c406 100644
--- a/libs/ardour/export_format_specification.cc
+++ b/libs/ardour/export_format_specification.cc
@@ -524,11 +524,13 @@ ExportFormatSpecification::set_format (boost::shared_ptr<ExportFormat> format)
 }
 
 string
-ExportFormatSpecification::description ()
+ExportFormatSpecification::description (bool include_name)
 {
 	string desc;
 
-	desc = _name + ": ";
+	if (include_name) {
+		desc = _name + ": ";
+	}
 
 	if (_normalize) {
 		desc += _("normalize, ");