livetrax/gtk2_ardour/plugin_ui.cc

/*
    Copyright (C) 2000 Paul Davis 

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id$
*/

#include <climits>
#include <cerrno>
#include <cmath>
#include <string>

#include <pbd/stl_delete.h>
#include <pbd/xml++.h>
#include <pbd/failed_constructor.h>

#include <gtkmm2ext/click_box.h>
#include <gtkmm2ext/fastmeter.h>
#include <gtkmm2ext/slider_controller.h>
#include <gtkmm2ext/barcontroller.h>
#include <gtkmm2ext/utils.h>
#include <gtkmm2ext/doi.h>

#include <midi++/manager.h>

#include <ardour/audioengine.h>
#include <ardour/plugin.h>
#include <ardour/insert.h>
#include <ardour/ladspa_plugin.h>
#ifdef VST_SUPPORT
#include <ardour/vst_plugin.h>
#endif

#include <lrdf.h>

#include "ardour_ui.h"
#include "prompter.h"
#include "plugin_ui.h"
#include "utils.h"
#include "gui_thread.h"

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace Gtkmm2ext;
using namespace Gtk;
using namespace sigc;

PluginUIWindow::PluginUIWindow (AudioEngine &engine, PluginInsert& insert, bool scrollable)
	: ArdourDialog ("plugin ui")
{
	if (insert.plugin().has_editor()) {

#ifdef VST_SUPPORT

		VSTPlugin* vp;

		if ((vp = dynamic_cast<VSTPlugin*> (&insert.plugin())) != 0) {
			
			
			VSTPluginUI* vpu = new VSTPluginUI (insert, *vp);
			
			_pluginui = vpu;
			add (*vpu);
			vpu->package (*this);
			
		} else {
#endif
			error << _("unknown type of editor-supplying plugin (note: no VST support in this version of ardour)")
			      << endmsg;
			throw failed_constructor ();
#ifdef VST_SUPPORT
		}
#endif

	} else {

		PluginUI*  pu  = new PluginUI (engine, insert, scrollable);
		
		_pluginui = pu;
		add (*pu);
		
		map_event.connect (mem_fun (*pu, &PluginUI::start_updating));
		unmap_event.connect (mem_fun (*pu, &PluginUI::stop_updating));
	}

	set_position (Gtk::WIN_POS_MOUSE);
	set_name ("PluginEditor");
	add_events (Gdk::KEY_PRESS_MASK|Gdk::KEY_RELEASE_MASK);

	signal_delete_event().connect (bind (sigc::ptr_fun (just_hide_it), reinterpret_cast<Window*> (this)));
	insert.GoingAway.connect (mem_fun(*this, &PluginUIWindow::plugin_going_away));

	if (scrollable) {
		gint h = _pluginui->get_preferred_height ();
		if (h > 600) h = 600;
		set_default_size (450, h); 
	}
}

PluginUIWindow::~PluginUIWindow ()
{
}

PluginUI::PluginUI (AudioEngine &engine, PluginInsert& pi, bool scrollable)
	: PlugUIBase (pi),
	  engine(engine),
	  button_table (initial_button_rows, initial_button_cols),
	  output_table (initial_output_rows, initial_output_cols),
	  automation_menu (0),
	  is_scrollable(scrollable)
{
	set_name ("PluginEditor");
	set_border_width (10);
	set_homogeneous (false);

	settings_box.set_homogeneous (false);

	HBox* constraint_hbox = manage (new HBox);
	HBox* smaller_hbox = manage (new HBox);

	smaller_hbox->pack_start (combo, false, false);
	smaller_hbox->pack_start (save_button, false, false);

	constraint_hbox->set_spacing (10);
	constraint_hbox->pack_start (*smaller_hbox, true, false);
	constraint_hbox->pack_end (bypass_button, false, false);

//	name_ebox.add (*text_hbox);
//	info_vbox.pack_start (name_ebox, false, false);
//	info_vbox.pack_start (makerinfo_label, false, false);
//	info_vbox.pack_start (paraminfo_label, false, false, 5);

//	settings_box.pack_start (info_vbox, false, false, 10);
	settings_box.pack_end (*constraint_hbox, false, false);

	pack_start (settings_box, false, false);

	if ( is_scrollable ) {
		scroller.set_policy (Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);
		scroller.set_name ("PluginEditor");
		scroller_view.set_name("PluginEditor");
		scroller_view.add (hpacker);
		scroller.add (scroller_view);
		
		pack_start (scroller, true, true);

	}
	else {
		pack_start (hpacker, false, false);

		// this is a hack to get the theme right
		name_ebox.set_name ("PluginNameBox");
	}

	insert.active_changed.connect (mem_fun(*this, &PluginUI::redirect_active_changed));
	bypass_button.set_active (!insert.active());
	
	build (engine);
}

PluginUI::~PluginUI ()
{
	if (output_controls.size() > 0) {
		screen_update_connection.disconnect();
	}
}

void
PluginUI::build (AudioEngine &engine)

{
	guint32 i = 0;
	guint32 x = 0;
	Frame* frame;
	Frame* bt_frame;
	VBox* box;
	char info[32];
	int output_row, output_col;
	int button_row, button_col;
	int output_rows, output_cols;
	int button_rows, button_cols;
	guint32 n_ins=0, n_outs = 0;

	prefheight = 30;
	hpacker.set_spacing (10);

	output_rows = initial_output_rows;
	output_cols = initial_output_cols;
	button_rows = initial_button_rows;
	button_cols = initial_button_cols;
	output_row = 0;
	button_row = 0;
	output_col = 0;
	button_col = 0;

	button_table.set_homogeneous (false);
	button_table.set_row_spacings (2);
	button_table.set_col_spacings (2);
	output_table.set_homogeneous (true);
	output_table.set_row_spacings (2);
	output_table.set_col_spacings (2);
	button_table.set_border_width (5);
	output_table.set_border_width (5);

	hpacker.set_border_width (10);

	bt_frame = manage (new Frame);
	bt_frame->set_name ("BaseFrame");
	bt_frame->add (button_table);
	hpacker.pack_start(*bt_frame, true, true);

	box = manage (new VBox);
	frame = manage (new Frame);
	frame->set_name ("BaseFrame");
	frame->add (*box);
	hpacker.pack_start(*frame, true, true);

	box->set_border_width (5);
	box->set_spacing (1);
	
	/* find all ports. build control elements for all appropriate control ports */

	for (i = 0; i < plugin.parameter_count(); ++i) {

		if (plugin.parameter_is_control (i)) {

			ControlUI* cui;
				
			/* if we are scrollable, just use one long column */

			if (!is_scrollable) {
				if (x++ > 7){
					frame = manage (new Frame);
					frame->set_name ("BaseFrame");
					box = manage (new VBox);
					
					box->set_border_width (5);
					box->set_spacing (1);

					frame->add (*box);
					hpacker.pack_start(*frame,true,true);

					x = 0;
				}
			}

			/* Don't show latency control ports */

			if (plugin.describe_parameter (i) == X_("latency")) {
				continue;
			}

			if ((cui = build_control_ui (engine, i, plugin.get_nth_midi_control (i))) == 0) {
				error << string_compose(_("Plugin Editor: could not build control element for port %1"), i) << endmsg;
				continue;
			}
				
			if (cui->control || cui->clickbox || cui->combo) {

				box->pack_start (*cui, false, false);

			} else if (cui->button) {

				if (button_row == button_rows) {
					button_row = 0;
					if (++button_col == button_cols) {
						button_cols += 2;
						button_table.resize (button_rows, button_cols);
					}
				}

				button_table.attach (*cui, button_col, button_col + 1, button_row, button_row+1, 
						     FILL|EXPAND, FILL);
				button_row++;

			} else if (cui->display) {

				if (output_row == output_rows) {
					output_row = 0;
					if (++output_col == output_cols) {
						output_cols += 2;
						output_table.resize (output_rows, output_cols);
					}
				}
				
				output_table.attach (*cui, output_col, output_col + 1, output_row, output_row+1, 
						     FILL|EXPAND, FILL);
 
				output_row++;
			}
				
			/* HACK: ideally the preferred height would be queried from
			   the complete hpacker, but I can't seem to get that
			   information in time, so this is an estimation 
			*/

			prefheight += 30;

		} 
	}

	n_ins = plugin.get_info().n_inputs;
	n_outs = plugin.get_info().n_outputs;

	if (box->children().empty()) {
		hpacker.remove (*frame);
	}

	if (button_table.children().empty()) {
		hpacker.remove (*bt_frame);
	}

	if (!output_table.children().empty()) {
		frame = manage (new Frame);
		frame->set_name ("BaseFrame");
		frame->add (output_table);
		hpacker.pack_end (*frame, true, true);
	}

	output_update ();

	string pname = plugin.name();
	
	if (pname.length() > 24) {
		pname = pname.substr (0, 24);
		pname += "...";
		ARDOUR_UI::instance()->tooltips().set_tip(name_ebox, plugin.name());
	}

	
	nameinfo_label.set_text (pname);
	nameinfo_label.set_name ("PluginNameInfo");
	nameinfo_label.set_alignment (0.0, 0.0);

	string maker = plugin.maker();
	string::size_type email_pos;

	if ((email_pos = maker.find_first_of ('<')) != string::npos) {
		maker = maker.substr (0, email_pos - 1);
	}

	if (maker.length() > 32) {
		maker = maker.substr (0, 32);
		maker += " ...";
	}

	makerinfo_label.set_text (maker);
	makerinfo_label.set_name ("PluginMakerInfo");
	makerinfo_label.set_alignment (0.0, 0.0);
	
	snprintf (info, sizeof(info),"[ %u %s | %u %s ]",
		  n_ins, ngettext(_("in"), _("ins"), n_ins),
		  n_outs, ngettext(_("out"), _("outs"), n_outs));
	paraminfo_label.set_text (info);
	paraminfo_label.set_name ("PluginParameterInfo");
	paraminfo_label.set_alignment (0.0, 0.0);

	output_table.show_all ();
	button_table.show_all ();
}

PluginUI::ControlUI::ControlUI ()
	: automate_button (X_("")) // force creation of a label 
{
	automate_button.set_name ("PluginAutomateButton");
	ARDOUR_UI::instance()->tooltips().set_tip (automate_button,
						   _("automation control"));

	/* don't fix the height, it messes up the bar controllers */

	set_size_request_to_display_given_text (automate_button, X_("longenuff"), 2, -1);

	ignore_change = 0;
	display = 0;
	button = 0;
	control = 0;
	clickbox = 0;
	adjustment = 0;
	meterinfo = 0;
}

PluginUI::ControlUI::~ControlUI() 
{
	if (adjustment) {
		delete adjustment;
	}

	if (meterinfo) {
		delete meterinfo->meter;
		delete meterinfo;
	}
}

void
PluginUI::automation_state_changed (ControlUI* cui)
{
	/* update button label */

	switch (insert.get_port_automation_state (cui->port_index) & (Off|Play|Touch|Write)) {
	case Off:
		static_cast<Gtk::Label*>(cui->automate_button.get_child())->set_text (_("off"));
		break;
	case Play:
		static_cast<Gtk::Label*>(cui->automate_button.get_child())->set_text (_("play"));
		break;
	case Write:
		static_cast<Gtk::Label*>(cui->automate_button.get_child())->set_text (_("write"));
		break;
	case Touch:
		static_cast<Gtk::Label*>(cui->automate_button.get_child())->set_text (_("touch"));
		break;
	default:
		static_cast<Gtk::Label*>(cui->automate_button.get_child())->set_text (_("???"));
		break;
	}
}


static void integer_printer (char buf[32], Adjustment &adj, void *arg)
{
	snprintf (buf, 32, "%.0f", adj.get_value());
}

void
PluginUI::print_parameter (char *buf, uint32_t len, uint32_t param)
{
	plugin.print_parameter (param, buf, len);
}

PluginUI::ControlUI*
PluginUI::build_control_ui (AudioEngine &engine, guint32 port_index, MIDI::Controllable* mcontrol)

{
	ControlUI* control_ui;
	Plugin::ParameterDescriptor desc;

	plugin.get_parameter_descriptor (port_index, desc);

	control_ui = manage (new ControlUI ());
	control_ui->adjustment = 0;
	control_ui->combo = 0;
	control_ui->combo_map = 0;
	control_ui->port_index = port_index;
	control_ui->update_pending = false;
	control_ui->label.set_text (desc.label);
	control_ui->label.set_alignment (0.0, 0.5);
	control_ui->label.set_name ("PluginParameterLabel");

	control_ui->set_spacing (5);

	if (plugin.parameter_is_input (port_index)) {

		LadspaPlugin* lp;

		if ((lp = dynamic_cast<LadspaPlugin*>(&plugin)) != 0) {
			
			lrdf_defaults* defaults = lrdf_get_scale_values(lp->unique_id(), port_index);
			
			if (defaults && defaults->count > 0)	{
				
				control_ui->combo = new Gtk::ComboBoxText;
				//control_ui->combo->set_value_in_list(true, false);
				set_popdown_strings (*control_ui->combo, setup_scale_values(port_index, control_ui));
				control_ui->combo->signal_unmap_event().connect( mem_fun(*this, &PluginUI::control_combo_changed), control_ui);
				plugin.ParameterChanged.connect (bind (mem_fun(*this, &PluginUI::parameter_changed), control_ui));
				control_ui->pack_start(control_ui->label, true, true);
				control_ui->pack_start(*control_ui->combo, false, true);
				
				update_control_display(control_ui);
				
				lrdf_free_setting_values(defaults);
				return control_ui;
			}
		}
			
		if (desc.toggled) {

			/* Build a button */
		
			control_ui->button = manage (new ToggleButton ());
			control_ui->button->set_name ("PluginEditorButton");
			control_ui->button->set_size_request (20, 20);

			control_ui->pack_start (control_ui->label, true, true);
			control_ui->pack_start (*control_ui->button, false, true);
			control_ui->pack_start (control_ui->automate_button, false, false);

			control_ui->button->signal_clicked().connect (bind (mem_fun(*this, &PluginUI::control_port_toggled), control_ui));
		
			if(plugin.get_parameter (port_index) == 1){
				control_ui->button->set_active(true);
			}

			return control_ui;
		}
	
		control_ui->adjustment = new Adjustment (0, 0, 0, 0, 0);

		/* XXX this code is not right yet, because it doesn't handle
		   the absence of bounds in any sensible fashion.
		*/

		control_ui->adjustment->set_lower (desc.lower);
		control_ui->adjustment->set_upper (desc.upper);

		control_ui->logarithmic = desc.logarithmic;
		if (control_ui->logarithmic) {
			if (control_ui->adjustment->get_lower() == 0.0) {
				control_ui->adjustment->set_lower (control_ui->adjustment->get_upper()/10000);
			}
			control_ui->adjustment->set_upper (log(control_ui->adjustment->get_upper()));
			control_ui->adjustment->set_lower (log(control_ui->adjustment->get_lower()));
		}
	
		float delta = desc.upper - desc.lower;

		control_ui->adjustment->set_page_size (delta/100.0);
		control_ui->adjustment->set_step_increment (desc.step);
		control_ui->adjustment->set_page_increment (desc.largestep);

		if (desc.integer_step) {
			control_ui->clickbox = new ClickBox (control_ui->adjustment, "PluginUIClickBox");
			Gtkmm2ext::set_size_request_to_display_given_text (*control_ui->clickbox, "g9999999", 2, 2);
			control_ui->clickbox->set_print_func (integer_printer, 0);
		} else {
//			control_ui->control = new HSliderController (ARDOUR_UI::instance()->plugin_ui_slider_pix(),
//								     control_ui->adjustment,
//								     mcontrol);

			sigc::slot<void,char*,uint32_t> pslot = sigc::bind (mem_fun(*this, &PluginUI::print_parameter), (uint32_t) port_index);

			control_ui->control = new BarController (*control_ui->adjustment, mcontrol, pslot);
			control_ui->control->set_size_request (200, 15);
			control_ui->control->set_name (X_("PluginSlider"));
			control_ui->control->set_style (BarController::LeftToRight);
			control_ui->control->set_use_parent (true);

			control_ui->control->get_spin_button().signal_focus_in_event().connect (mem_fun(*this, &PluginUI::entry_focus_event));
			control_ui->control->get_spin_button().signal_focus_out_event().connect (mem_fun(*this, &PluginUI::entry_focus_event));

			control_ui->control->StartGesture.connect (bind (mem_fun(*this, &PluginUI::start_touch), control_ui));
			control_ui->control->StopGesture.connect (bind (mem_fun(*this, &PluginUI::stop_touch), control_ui));
			
		}

		if (control_ui->logarithmic) {
			control_ui->adjustment->set_value(log(plugin.get_parameter(port_index)));
		} else{
			control_ui->adjustment->set_value(plugin.get_parameter(port_index));
		}

		/* XXX memory leak: SliderController not destroyed by ControlUI
		   destructor, and manage() reports object hierarchy
		   ambiguity.
		*/

		control_ui->pack_start (control_ui->label, true, true);
		if (desc.integer_step) {
			control_ui->pack_start (*control_ui->clickbox, false, false);
		} else {
			control_ui->pack_start (*control_ui->control, false, false);
		}

		control_ui->pack_start (control_ui->automate_button, false, false);
control_ui->adjustment->signal_value_changed().connect (bind (mem_fun(*this, &PluginUI::control_adjustment_changed), control_ui));
		control_ui->automate_button.signal_clicked().connect (bind (mem_fun(*this, &PluginUI::astate_clicked), control_ui, (uint32_t) port_index));

		automation_state_changed (control_ui);

		plugin.ParameterChanged.connect (bind (mem_fun(*this, &PluginUI::parameter_changed), control_ui));
		insert.automation_list (port_index).automation_state_changed.connect 
			(bind (mem_fun(*this, &PluginUI::automation_state_changed), control_ui));

	} else if (plugin.parameter_is_output (port_index)) {

		control_ui->display = manage (new EventBox);
		control_ui->display->set_name ("ParameterValueDisplay");

		control_ui->display_label = manage (new Label);
		control_ui->display_label->set_name ("ParameterValueDisplay");

		control_ui->display->add (*control_ui->display_label);
		Gtkmm2ext::set_size_request_to_display_given_text (*control_ui->display, "g999999", 2, 2);

		control_ui->display->show_all ();

		/* set up a meter */
		/* TODO: only make a meter if the port is Hinted for it */

		MeterInfo * info = new MeterInfo(port_index);
 		control_ui->meterinfo = info;
		
		info->meter = new FastMeter (100, 5, FastMeter::Horizontal);

		info->min_unbound = desc.min_unbound;
		info->max_unbound = desc.max_unbound;

		info->min = desc.lower;
		info->max = desc.upper;

		control_ui->vbox = manage (new VBox);

 		control_ui->vbox->pack_start (control_ui->label, false, false);
 		control_ui->vbox->pack_start (*info->meter, false, false);
		
 		control_ui->pack_start (*control_ui->vbox, false, false);
 		control_ui->pack_start (*control_ui->display, false, false);

		control_ui->meterinfo->meter->show_all();
		control_ui->meterinfo->packed = true;
		
		output_controls.push_back (control_ui);
	}
	
	plugin.ParameterChanged.connect (bind (mem_fun(*this, &PluginUI::parameter_changed), control_ui));
	return control_ui;
}

void
PluginUI::start_touch (PluginUI::ControlUI* cui)
{
	insert.automation_list (cui->port_index).start_touch ();
}

void
PluginUI::stop_touch (PluginUI::ControlUI* cui)
{
	insert.automation_list (cui->port_index).stop_touch ();
}

void
PluginUI::astate_clicked (ControlUI* cui, uint32_t port)
{
	using namespace Menu_Helpers;

	if (automation_menu == 0) {
		automation_menu = manage (new Menu);
		automation_menu->set_name ("ArdourContextMenu");
	} 

	MenuList& items (automation_menu->items());

	items.clear ();
	items.push_back (MenuElem (_("off"), 
				   bind (mem_fun(*this, &PluginUI::set_automation_state), (AutoState) Off, cui)));
	items.push_back (MenuElem (_("play"),
				   bind (mem_fun(*this, &PluginUI::set_automation_state), (AutoState) Play, cui)));
	items.push_back (MenuElem (_("write"),
				   bind (mem_fun(*this, &PluginUI::set_automation_state), (AutoState) Write, cui)));
	items.push_back (MenuElem (_("touch"),
				   bind (mem_fun(*this, &PluginUI::set_automation_state), (AutoState) Touch, cui)));

	automation_menu->popup (1, 0);
}

void
PluginUI::set_automation_state (AutoState state, ControlUI* cui)
{
	insert.set_port_automation_state (cui->port_index, state);
}

void
PluginUI::control_adjustment_changed (ControlUI* cui)
{
	if (cui->ignore_change) {
		return;
	}

	double value = cui->adjustment->get_value();

	if (cui->logarithmic) {
	  	value = exp(value);
	}

	insert.set_parameter (cui->port_index, (float) value);
}

void
PluginUI::parameter_changed (uint32_t abs_port_id, float val, ControlUI* cui)
{
	if (cui->port_index == abs_port_id) {
		if (!cui->update_pending) {
			cui->update_pending = true;
			Gtkmm2ext::UI::instance()->call_slot (bind (mem_fun(*this, &PluginUI::update_control_display), cui));
		}
	}
}

void
PluginUI::update_control_display (ControlUI* cui)	
{
	/* XXX how do we handle logarithmic stuff here ? */
	
	cui->update_pending = false;

	float val = plugin.get_parameter (cui->port_index);

	cui->ignore_change++;
	if (cui->combo) {
	        std::map<string,float>::iterator it;
		for (it = cui->combo_map->begin(); it != cui->combo_map->end(); ++it) {
			if (it->second == val) {
				cui->combo->set_active_text(it->first);
				break;
			}
		}
	} else if (cui->adjustment == 0) {

		if (val > 0.5) {
			cui->button->set_active (true);
		} else {
			cui->button->set_active (false);
		}

	} else {
		if (cui->logarithmic) {
			val = log(val);
		}
		if (val != cui->adjustment->get_value()) {
			cui->adjustment->set_value (val);
		}
	}
	cui->ignore_change--;
}

void
PluginUI::control_port_toggled (ControlUI* cui)
{
	if (!cui->ignore_change) {
		insert.set_parameter (cui->port_index, cui->button->get_active());
	}
}

gint
PluginUI::control_combo_changed (GdkEventAny* ignored, ControlUI* cui)
{
	if (!cui->ignore_change) {
		string value = cui->combo->get_active_text();
		std::map<string,float> mapping = *cui->combo_map;
		insert.set_parameter (cui->port_index, mapping[value]);
	}

	return FALSE;
}

void
PluginUIWindow::plugin_going_away (ARDOUR::Redirect* ignored)
{
	ENSURE_GUI_THREAD(bind (mem_fun(*this, &PluginUIWindow::plugin_going_away), ignored));
	
	_pluginui->stop_updating(0);
	delete_when_idle (this);
}

gint
PluginUI::entry_focus_event (GdkEventFocus* ev)
{
	if (ev->in) {
		ARDOUR_UI::instance()->allow_focus (true);
	} else {
		ARDOUR_UI::instance()->allow_focus (false);
	}
	return TRUE;
}

void
PluginUI::redirect_active_changed (Redirect* r, void* src)
{
	ENSURE_GUI_THREAD(bind (mem_fun(*this, &PluginUI::redirect_active_changed), r, src));
	
	bypass_button.set_active (!r->active());
}

gint
PluginUI::start_updating (GdkEventAny *ev)
{
	if (output_controls.size() > 0 ) {
		screen_update_connection.disconnect();
		screen_update_connection = ARDOUR_UI::instance()->RapidScreenUpdate.connect 
			(mem_fun(*this, &PluginUI::output_update));
	}
	return FALSE;
}

gint 
PluginUI::stop_updating (GdkEventAny *ev)
{
	if (output_controls.size() > 0 ) {
		screen_update_connection.disconnect();
	}
	return FALSE;
}

void
PluginUI::output_update ()
{
	for (vector<ControlUI*>::iterator i = output_controls.begin(); i != output_controls.end(); ++i) {
		float val = plugin.get_parameter ((*i)->port_index);
		char buf[32];
		snprintf (buf, sizeof(buf), "%.2f", val);
		(*i)->display_label->set_text (buf);

		/* autoscaling for the meter */
		if ((*i)->meterinfo && (*i)->meterinfo->packed) {
			
			if (val < (*i)->meterinfo->min) {
				if ((*i)->meterinfo->min_unbound)
					(*i)->meterinfo->min = val;
				else
					val = (*i)->meterinfo->min;
			}

			if (val > (*i)->meterinfo->max) {
				if ((*i)->meterinfo->max_unbound)
					(*i)->meterinfo->max = val;
				else
					val = (*i)->meterinfo->max;
			}
			
			if ((*i)->meterinfo->max > (*i)->meterinfo->min ) {
				float lval = (val - (*i)->meterinfo->min) / ((*i)->meterinfo->max - (*i)->meterinfo->min) ;
				(*i)->meterinfo->meter->set (lval );
			}
		}
	}
}

list<string> 
PluginUI::setup_scale_values(guint32 port_index, ControlUI* cui)
{
	list<string> enums;
	LadspaPlugin* lp = dynamic_cast<LadspaPlugin*> (&plugin);

	cui->combo_map = new std::map<string, float>;
	lrdf_defaults* defaults = lrdf_get_scale_values(lp->unique_id(), port_index);
	if (defaults)	{
		for (uint32_t i = 0; i < defaults->count; ++i) {
			enums.push_back(defaults->items[i].label);
			pair<string, float> newpair;
			newpair.first = defaults->items[i].label;
			newpair.second = defaults->items[i].value;
			cui->combo_map->insert(newpair);
		}

		lrdf_free_setting_values(defaults);
	}

	return enums;
}

PlugUIBase::PlugUIBase (PluginInsert& pi)
	: insert (pi),
	  plugin (insert.plugin()),
	  save_button(_("save")),
	  bypass_button (_("bypass"))
{
        //combo.set_use_arrows_always(true);
	set_popdown_strings (combo, plugin.get_presets());
	combo.set_active_text ("");
	combo.signal_unmap_event().connect(mem_fun(*this, &PlugUIBase::setting_selected));

	save_button.set_name ("PluginSaveButton");
	save_button.signal_clicked().connect(mem_fun(*this, &PlugUIBase::save_plugin_setting));

	bypass_button.set_name ("PluginBypassButton");
	bypass_button.signal_toggled().connect (mem_fun(*this, &PlugUIBase::bypass_toggled));
}

gint
PlugUIBase::setting_selected(GdkEventAny* ignored)
{
	if (combo.get_active_text().length() > 0) {
		if (!plugin.load_preset(combo.get_active_text())) {
			warning << string_compose(_("Plugin preset %1 not found"), combo.get_active_text()) << endmsg;
		}
	}

	return FALSE;
}

void
PlugUIBase::save_plugin_setting ()
{
	ArdourPrompter prompter (true);
	prompter.set_prompt(_("Name for plugin settings:"));

	prompter.show_all();

	switch (prompter.run ()) {
	case GTK_RESPONSE_ACCEPT:

		string name;

		prompter.get_result(name);

		if (name.length()) {
			if(plugin.save_preset(name)){
				set_popdown_strings (combo, plugin.get_presets());
				combo.set_active_text (name);
			}
		}
		break;
	}
}

void
PlugUIBase::bypass_toggled ()
{
	bool x;

	if ((x = bypass_button.get_active()) == insert.active()) {
		insert.set_active (!x, this);
	}
}