drmr2/drmr2_ui.c

/* drmr2.c
 * LV2 DrMr2 plugin
 * Copyright 2012 Nick Lanham <nick@afternight.org>
 *
 * Public License v3. source code is available at 
 * <http://github.com/nicklan/drmr>

 * THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <limits.h>
#include <stdlib.h>

#include <gtk/gtk.h>
#include <gdk/gdk.h>

#include "drmr2.h"
#include "drmr2_hydrogen.h"
#include "nknob.h"

#include "lv2/lv2plug.in/ns/ext/atom/atom.h"
#include "lv2/lv2plug.in/ns/ext/atom/forge.h"
#include "lv2/lv2plug.in/ns/ext/atom/util.h"
#include "lv2/lv2plug.in/ns/ext/urid/urid.h"
#include "lv2/lv2plug.in/ns/extensions/ui/ui.h"

#define DRMR_UI_URI "http://github.com/AlkorZ3/drmr2#ui"
#define NO_KIT_STRING "[No Current Kit]"

typedef struct {
  LV2UI_Write_Function write;
  LV2UI_Controller     controller;
  LV2_Atom_Forge forge;

  LV2_URID_Map *map;
  drmr_uris uris;

  GtkWidget *drmr_widget;
  GtkLabel *current_kit_label;
  GtkTable *sample_table;
  GtkComboBox *kit_combo;
  GtkWidget *no_kit_label;
  GtkSpinButton *base_spin;
  GtkLabel *base_label;
  GtkListStore *kit_store;
  GtkWidget** gain_sliders;
  GtkWidget** pan_sliders;
  GtkWidget** notify_leds;
  GtkWidget *channel_combo_box, *position_combo_box, *velocity_checkbox, *note_off_checkbox;
  GtkScrolledWindow *sample_view;

  float *gain_vals,*pan_vals;

  
  gchar *bundle_path;

  int channel;
  int cols;
  int startSamp;

  gboolean forceUpdate;

  int samples;
  int baseNote;

  GQuark gain_quark, pan_quark, trigger_quark;

  int curKit;
  int kitReq;
  kits* kits;
} DrMrUi;

static GdkPixbuf *led_on_pixbuf=NULL,*led_off_pixbuf=NULL;

static gboolean gain_callback(GtkRange* range, GtkScrollType type, gdouble value, gpointer data) {
  DrMrUi* ui = (DrMrUi*)data;
  int gidx = GPOINTER_TO_INT(g_object_get_qdata(G_OBJECT(range),ui->gain_quark));
  float gain = (float)value;
  ui->gain_vals[gidx] = gain;
  ui->write(ui->controller,gidx+DRMR_GAIN_ONE,4,0,&gain);
  return FALSE;
}

static gboolean pan_callback(GtkRange* range, GtkScrollType type, gdouble value, gpointer data) {
  DrMrUi* ui = (DrMrUi*)data;
  int pidx = GPOINTER_TO_INT(g_object_get_qdata(G_OBJECT(range),ui->pan_quark));
  float pan = (float)value;
  ui->pan_vals[pidx] = pan;
  ui->write(ui->controller,pidx+DRMR_PAN_ONE,4,0,&pan);
  return FALSE;
}

static void send_ui_msg(DrMrUi* ui, void (*add_data)(DrMrUi* ui, gpointer data), gpointer data) {
  LV2_Atom_Forge_Frame set_frame;
  uint8_t msg_buf[1024];
  lv2_atom_forge_set_buffer(&ui->forge, msg_buf, 1024);
  LV2_Atom *msg = (LV2_Atom*)lv2_atom_forge_resource
    (&ui->forge, &set_frame, 1, ui->uris.ui_msg);
  (*add_data)(ui,data);
  lv2_atom_forge_pop(&ui->forge,&set_frame);
  ui->write(ui->controller,DRMR_CONTROL,
	    lv2_atom_total_size(msg),
	    ui->uris.atom_eventTransfer,
	    msg);
}

static void led_data(DrMrUi *ui, gpointer data) {
  lv2_atom_forge_property_head(&ui->forge, ui->uris.sample_trigger,0);
  lv2_atom_forge_int(&ui->forge, GPOINTER_TO_INT(data));
}

static void ignore_velocity_data(DrMrUi* ui, gpointer data) {
  lv2_atom_forge_property_head(&ui->forge, ui->uris.velocity_toggle,0);
  lv2_atom_forge_bool(&ui->forge, gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(data)));
}

static void ignore_note_off_data(DrMrUi* ui, gpointer data) {
  lv2_atom_forge_property_head(&ui->forge, ui->uris.note_off_toggle,0);
  lv2_atom_forge_bool(&ui->forge, gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(data)));
}

static gboolean trigger_led_clicked(GtkWidget *widget, GdkEvent  *event, gpointer data) {
  DrMrUi* ui = (DrMrUi*)data;
  send_ui_msg(ui,&led_data,g_object_get_qdata(G_OBJECT(widget),ui->trigger_quark));
  return FALSE;
}

static gboolean ignore_velocity_toggled(GtkToggleButton *button, gpointer data) {
  DrMrUi* ui = (DrMrUi*)data;
  send_ui_msg(ui,&ignore_velocity_data,button);
  return FALSE;
}

static gboolean ignore_note_off_toggled(GtkToggleButton *button, gpointer data) {
  DrMrUi* ui = (DrMrUi*)data;
  send_ui_msg(ui,&ignore_note_off_data,button);
  return FALSE;
}

static void fill_sample_table(DrMrUi* ui, int samples, char** names, GtkWidget** notify_leds, GtkWidget** gain_sliders, GtkWidget** pan_sliders) {
  int row = 0;
  int col = 0;
  int si;
  gchar buf[64];
  int rows = (samples/ui->cols);
  if (samples % ui->cols != 0) rows++;
  gtk_table_resize(ui->sample_table,rows,ui->cols);

  switch (ui->startSamp) {
  case 1: // bottom left
    row = rows-1;
    break;
  case 2: // top right
    col = ui->cols-1;
    break;
  case 3: // bottom right
    row = rows-1;
    col = ui->cols-1;
    break;
  }

  for(si = 0;si<samples;si++) {
    GtkWidget *frame,*vbox,*hbox,*gain_vbox,*pan_vbox;
    GtkWidget *button_box, *led_event_box, *led;
    GtkWidget* gain_slider;
    GtkWidget* pan_slider;
    GtkWidget* gain_label;
    GtkWidget* pan_label;
    gboolean slide_expand;

    snprintf(buf,64,"<b>%s</b> (%i)",names[si],si);

    frame = gtk_frame_new(buf);
    gtk_label_set_use_markup(GTK_LABEL(gtk_frame_get_label_widget(GTK_FRAME(frame))),true);
    gtk_frame_set_shadow_type(GTK_FRAME(frame),GTK_SHADOW_OUT);

    vbox = gtk_vbox_new(false,5);
    hbox = gtk_hbox_new(false,0);

#ifdef NO_NKNOB
    gain_slider = gtk_vscale_new_with_range(GAIN_MIN,6.0,1.0);
    gtk_scale_set_value_pos(GTK_SCALE(gain_slider),GTK_POS_BOTTOM);
    gtk_scale_set_digits(GTK_SCALE(gain_slider),1);
    gtk_scale_add_mark(GTK_SCALE(gain_slider),0.0,GTK_POS_RIGHT,"0 dB");
    // Hrmm, -inf label is at top in ardour for some reason
    //gtk_scale_add_mark(GTK_SCALE(gain_slider),GAIN_MIN,GTK_POS_RIGHT,"-inf");
    gtk_range_set_inverted(GTK_RANGE(gain_slider),true);
    slide_expand = true;
#else
    gain_slider = n_knob_new_with_range(0.0,GAIN_MIN,6.0,1.0);
    n_knob_set_load_prefix(N_KNOB(gain_slider),ui->bundle_path);
    gtk_widget_set_has_tooltip(gain_slider,TRUE);
    slide_expand = false;
#endif
    g_object_set_qdata (G_OBJECT(gain_slider),ui->gain_quark,GINT_TO_POINTER(si));
    if (gain_sliders) gain_sliders[si] = gain_slider;
    if (si < 32)
      gtk_range_set_value(GTK_RANGE(gain_slider),ui->gain_vals[si]);
    else // things are gross if we have > 32 samples, what to do?
      gtk_range_set_value(GTK_RANGE(gain_slider),0.0);
    g_signal_connect(G_OBJECT(gain_slider),"change-value",G_CALLBACK(gain_callback),ui);
    gain_label = gtk_label_new("Gain");
    gain_vbox = gtk_vbox_new(false,0);

#ifdef NO_NKNOB
    pan_slider = gtk_hscale_new_with_range(-1.0,1.0,0.1);
    gtk_scale_add_mark(GTK_SCALE(pan_slider),0.0,GTK_POS_TOP,NULL);
#else
    pan_slider = n_knob_new_with_range(0.0,-1.0,1.0,0.1);
    n_knob_set_load_prefix(N_KNOB(pan_slider),ui->bundle_path);
    gtk_widget_set_has_tooltip(pan_slider,TRUE);
#endif
    if (pan_sliders) pan_sliders[si] = pan_slider;
    if (si < 32)
      gtk_range_set_value(GTK_RANGE(pan_slider),ui->pan_vals[si]);
    else
      gtk_range_set_value(GTK_RANGE(pan_slider),0);
    g_object_set_qdata (G_OBJECT(pan_slider),ui->pan_quark,GINT_TO_POINTER(si));
    g_signal_connect(G_OBJECT(pan_slider),"change-value",G_CALLBACK(pan_callback),ui);
    pan_label = gtk_label_new("Pan");
    pan_vbox = gtk_vbox_new(false,0);
    
    gtk_box_pack_start(GTK_BOX(gain_vbox),gain_slider,slide_expand,slide_expand,0);
    gtk_box_pack_start(GTK_BOX(gain_vbox),gain_label,false,false,0);

    gtk_box_pack_start(GTK_BOX(pan_vbox),pan_slider,slide_expand,slide_expand,0);
    gtk_box_pack_start(GTK_BOX(pan_vbox),pan_label,false,false,0);

    gtk_box_pack_start(GTK_BOX(hbox),gain_vbox,true,true,0);
    gtk_box_pack_start(GTK_BOX(hbox),pan_vbox,true,true,0);

    gtk_box_pack_start(GTK_BOX(vbox),hbox,true,true,0);

    button_box = gtk_hbox_new(false,2);

    led_event_box = gtk_event_box_new();
    g_object_set_qdata(G_OBJECT(led_event_box),ui->trigger_quark,GINT_TO_POINTER(si));
    g_signal_connect(G_OBJECT(led_event_box),"button-release-event",
		     G_CALLBACK(trigger_led_clicked),ui);
    led = gtk_image_new_from_pixbuf(led_off_pixbuf);
    if (notify_leds) notify_leds[si] = led;
    gtk_container_add(GTK_CONTAINER(led_event_box),led);

    gtk_box_pack_start(GTK_BOX(button_box),led_event_box,false,false,0);
    gtk_box_pack_start(GTK_BOX(button_box),gtk_label_new(""),true,true,0);


    gtk_box_pack_start(GTK_BOX(hbox),button_box,false,false,0);
    g_object_set(vbox,"border-width",5,NULL);
    gtk_container_add(GTK_CONTAINER(frame),vbox);

    gtk_table_attach_defaults(ui->sample_table,frame,col,col+1,row,row+1);

    if (ui->startSamp > 1) {
      col--;
      if (col < 0) {
	if (ui->startSamp == 2)
	  row++;
	else
	  row--;
	col = ui->cols-1;
      }
    }
    else {
      col++;
      if (col >= ui->cols) {
	if (ui->startSamp == 0)
	  row++;
	else
	  row--;
	col = 0;
      }
    }
  }
  gtk_widget_queue_resize(GTK_WIDGET(ui->sample_table));
}

static gboolean unset_bg(gpointer data) {
  if (GTK_IS_IMAGE(data))
    gtk_image_set_from_pixbuf(GTK_IMAGE(data),led_off_pixbuf);
  return FALSE;
}

static void sample_triggered(DrMrUi *ui, int si) {
  if (ui->notify_leds && si < ui->samples) {
    gtk_image_set_from_pixbuf(GTK_IMAGE(ui->notify_leds[si]),led_on_pixbuf);
    g_timeout_add(200,unset_bg,ui->notify_leds[si]);
  }
}

static const char* nstrs = "C C#D D#E F F#G G#A A#B ";
static char baseLabelBuf[32];
static void setBaseLabel(int noteIdx) {
  int oct = (noteIdx/12)-1;
  int nmt = (noteIdx%12)*2;
  snprintf(baseLabelBuf,32,"Midi Base Note <b>(%c%c%i)</b>:",
	   nstrs[nmt],nstrs[nmt+1],oct);
}

static void base_changed(GtkSpinButton *base_spin, gpointer data) {
  DrMrUi* ui = (DrMrUi*)data;
  float base = (float)gtk_spin_button_get_value(base_spin);

  if (base >= 21.0f && base <= 107.0f) {
    setBaseLabel((int)base);
    ui->write(ui->controller,DRMR_BASENOTE,4,0,&base);
    gtk_label_set_markup(ui->base_label,baseLabelBuf);
    ui->baseNote = (int)base;
  }
  else
    fprintf(stderr,"Base spin got out of range: %f\n",base);
}

static void fill_kit_combo(GtkComboBox* combo, kits* kits) {
  int i;
  GtkTreeIter iter;
  GtkListStore *store = GTK_LIST_STORE(gtk_combo_box_get_model(combo));
  for (i=0;i<kits->num_kits;i++) {
    gtk_list_store_append (store, &iter);
    gtk_list_store_set(store, &iter, 0, kits->kits[i].name, -1);
  }
}

static gboolean idle = FALSE;
static gboolean kit_callback(gpointer data) {
  DrMrUi* ui = (DrMrUi*)data;
  if (ui->forceUpdate || (ui->kitReq != ui->curKit)) {
    ui->forceUpdate = false;
    int samples = (ui->kitReq<ui->kits->num_kits && ui->kitReq >= 0)?
      ui->kits->kits[ui->kitReq].samples:
      0;
    GtkWidget** notify_leds;
    GtkWidget** gain_sliders;
    GtkWidget** pan_sliders;
    if (ui->sample_table) {
      notify_leds = ui->notify_leds;
      gain_sliders = ui->gain_sliders;
      pan_sliders = ui->pan_sliders;
      ui->samples = 0;
      ui->notify_leds = NULL;
      ui->gain_sliders = NULL;
      ui->pan_sliders = NULL;
      if (notify_leds) free(notify_leds);
      if (gain_sliders) free(gain_sliders);
      if (pan_sliders) free(pan_sliders);
      gtk_widget_destroy(GTK_WIDGET(ui->sample_table));
      ui->sample_table = NULL;
    }
    if (samples > 0) {
      ui->sample_table = GTK_TABLE(gtk_table_new(1,1,true));
      gtk_table_set_col_spacings(ui->sample_table,5);
      gtk_table_set_row_spacings(ui->sample_table,5);

      notify_leds = malloc(samples*sizeof(GtkWidget*));
      gain_sliders = malloc(samples*sizeof(GtkWidget*));
      pan_sliders = malloc(samples*sizeof(GtkWidget*));
      fill_sample_table(ui,samples,ui->kits->kits[ui->kitReq].sample_names,notify_leds,gain_sliders,pan_sliders);
      gtk_scrolled_window_add_with_viewport(ui->sample_view, GTK_WIDGET(ui->sample_table));
      gtk_widget_show_all(GTK_WIDGET(ui->sample_table));
      ui->samples = samples;
      ui->notify_leds = notify_leds;
      ui->gain_sliders = gain_sliders;
      ui->pan_sliders = pan_sliders;

      gtk_label_set_text(ui->current_kit_label,ui->kits->kits[ui->kitReq].name);

      ui->curKit = ui->kitReq;
      gtk_combo_box_set_active(ui->kit_combo,ui->curKit);
      gtk_widget_show(GTK_WIDGET(ui->kit_combo));
      gtk_widget_hide(ui->no_kit_label);
    } else {
      gtk_widget_show(ui->no_kit_label);
      gtk_label_set_text(ui->current_kit_label,NO_KIT_STRING);
      gtk_widget_hide(GTK_WIDGET(ui->kit_combo));
    }
  }
  idle = FALSE;
  return FALSE; // don't keep calling
}

static LV2_Atom* build_path_message(DrMrUi *ui, const char* path) {
  LV2_Atom_Forge_Frame set_frame;
  LV2_Atom* msg = (LV2_Atom*)lv2_atom_forge_resource
    (&ui->forge, &set_frame, 1, ui->uris.ui_msg);
  lv2_atom_forge_property_head(&ui->forge, ui->uris.kit_path,0);
  lv2_atom_forge_path(&ui->forge, path, strlen(path));
  lv2_atom_forge_pop(&ui->forge,&set_frame);
  return msg;
}

static LV2_Atom* build_get_state_message(DrMrUi *ui) {
  LV2_Atom_Forge_Frame set_frame;
  LV2_Atom* msg = (LV2_Atom*)lv2_atom_forge_resource
    (&ui->forge, &set_frame, 1, ui->uris.get_state);
  lv2_atom_forge_pop(&ui->forge,&set_frame);
  return msg;
}

static void kit_combobox_changed(GtkComboBox* box, gpointer data) {
  DrMrUi* ui = (DrMrUi*)data;
  gint new_kit = gtk_combo_box_get_active (GTK_COMBO_BOX(box));

  if (ui->curKit != new_kit) {
    uint8_t msg_buf[1024];
    lv2_atom_forge_set_buffer(&ui->forge, msg_buf, 1024);
    LV2_Atom *msg = build_path_message(ui,ui->kits->kits[new_kit].path);

    ui->write(ui->controller,DRMR_CONTROL,
	      lv2_atom_total_size(msg),
	      ui->uris.atom_eventTransfer,
	      msg);
  }
}

static void channel_data(DrMrUi *ui, gpointer data) {
  lv2_atom_forge_property_head(&ui->forge, ui->uris.channel_nb,0);
  lv2_atom_forge_int(&ui->forge, GPOINTER_TO_INT(data));
}

static void channel_combobox_changed(GtkComboBox* box, gpointer data) {
  DrMrUi* ui = (DrMrUi*)data;
  gint channel = gtk_combo_box_get_active (GTK_COMBO_BOX(box));

  printf( "Channel Change: [%d]\n", channel);
  
  if (channel != ui->channel) {
    ui->channel = channel;
    ui->forceUpdate = true;
    kit_callback(ui);
    send_ui_msg(ui,&channel_data,GINT_TO_POINTER(channel));
  }
}

static GtkWidget *create_channel_combo(void)
{
  GtkWidget *combo;
  GtkListStore *list_store;
  GtkCellRenderer *cell;
  GtkTreeIter iter;
  int  i;
  char label[8];
  
  list_store = gtk_list_store_new(1, G_TYPE_STRING);

  gtk_list_store_append(list_store, &iter);
  gtk_list_store_set (list_store, &iter, 0, "Omni", -1);

  for( i = 1; i <= 16; i++) {
      sprintf( label, "%02d", i);
      gtk_list_store_append(list_store, &iter);
      gtk_list_store_set (list_store, &iter, 0, label, -1);
  }

  combo = gtk_combo_box_new_with_model(GTK_TREE_MODEL(list_store));

  gtk_combo_box_set_active(GTK_COMBO_BOX(combo),0);

  g_object_unref(list_store);

  cell = gtk_cell_renderer_text_new();
  gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(combo), cell, TRUE);
  gtk_cell_layout_set_attributes(GTK_CELL_LAYOUT(combo), cell, "text", 0, NULL);

  return combo;
}

static void position_data(DrMrUi *ui, gpointer data) {
  lv2_atom_forge_property_head(&ui->forge, ui->uris.zero_position,0);
  lv2_atom_forge_int(&ui->forge, GPOINTER_TO_INT(data));
}

static void position_combobox_changed(GtkComboBox* box, gpointer data) {
  DrMrUi* ui = (DrMrUi*)data;
  gint ss = gtk_combo_box_get_active (GTK_COMBO_BOX(box));
  if (ss != ui->startSamp) {
    ui->startSamp = ss;
    ui->forceUpdate = true;
    kit_callback(ui);
    send_ui_msg(ui,&position_data,GINT_TO_POINTER(ss));
  }
}

static GtkWidget *create_position_combo(void)
{
  GtkWidget *combo;
  GtkListStore *list_store;
  GtkCellRenderer *cell;
  GtkTreeIter iter;

  list_store = gtk_list_store_new(1, G_TYPE_STRING);

  gtk_list_store_append(list_store, &iter);
  gtk_list_store_set (list_store, &iter, 0, "Top Left", -1);
  gtk_list_store_append(list_store, &iter);
  gtk_list_store_set (list_store, &iter, 0, "Bottom Left", -1);
  gtk_list_store_append(list_store, &iter);
  gtk_list_store_set (list_store, &iter, 0, "Top Right", -1);
  gtk_list_store_append(list_store, &iter);
  gtk_list_store_set (list_store, &iter, 0, "Bottom Right", -1);

  combo = gtk_combo_box_new_with_model(GTK_TREE_MODEL(list_store));

#ifdef DRMR_UI_ZERO_SAMP
  gtk_combo_box_set_active(GTK_COMBO_BOX(combo),DRMR_UI_ZERO_SAMP);
#else
  gtk_combo_box_set_active(GTK_COMBO_BOX(combo),0);
#endif

  g_object_unref(list_store);

  cell = gtk_cell_renderer_text_new();
  gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(combo), cell, TRUE);
  gtk_cell_layout_set_attributes(GTK_CELL_LAYOUT(combo), cell, "text", 0, NULL);

  return combo;
}

static gulong expose_id;
static gboolean expose_callback (GtkWidget *widget, GdkEventExpose *event, gpointer data) {
  DrMrUi* ui = (DrMrUi*)data;
  uint8_t msg_buf[1024];
  lv2_atom_forge_set_buffer(&ui->forge, msg_buf, 1024);
  LV2_Atom *msg = build_get_state_message(ui);
  ui->write(ui->controller,DRMR_CONTROL,
	    lv2_atom_total_size(msg),
	    ui->uris.atom_eventTransfer,
	    msg);
  g_signal_handler_disconnect(widget,expose_id);
  return FALSE;
}

static void load_led_pixbufs(DrMrUi* ui) {
  GError *error = NULL;
  gchar *pixbuf_path;

  pixbuf_path = g_build_path(G_DIR_SEPARATOR_S,ui->bundle_path,"led_on.png",NULL);
  if (pixbuf_path) {
    led_on_pixbuf = gdk_pixbuf_new_from_file(pixbuf_path,&error);
    if (!led_on_pixbuf)
      fprintf(stderr,"Could not load led_on pixbuf: %s\n",error->message);
    g_free(pixbuf_path);
  } else
    fprintf(stderr,"Could not build path to load led_on pixbuf");


  pixbuf_path = g_build_path(G_DIR_SEPARATOR_S,ui->bundle_path,"led_off.png",NULL);
  if (pixbuf_path) {
    led_off_pixbuf = gdk_pixbuf_new_from_file(pixbuf_path,&error);
    if (!led_off_pixbuf)
      fprintf(stderr,"Could not load led_off pixbuf: %s\n",error->message);
    g_free(pixbuf_path);
  } else
    fprintf(stderr,"Could not build path to load led_off pixbuf");
}

static void build_drmr_ui(DrMrUi* ui) {
  GtkWidget *drmr_ui_widget;
  GtkWidget *opts_hbox1, *opts_hbox2,
    *kit_combo_box, *kit_label, *no_kit_label,
    *base_label, *base_spin, *channel_label, *position_label, *sample_view;
  GtkCellRenderer *cell_rend;
  GtkAdjustment *base_adj;
  
  PangoAttrList	*attr_lst;
  PangoAttribute *attr;

  drmr_ui_widget = gtk_vbox_new(false,0);
  expose_id = g_signal_connect (drmr_ui_widget, "expose-event", G_CALLBACK (expose_callback), ui);
  g_object_set(drmr_ui_widget,"border-width",6,NULL);

  ui->kit_store = gtk_list_store_new(1,G_TYPE_STRING);

  ui->current_kit_label = GTK_LABEL(gtk_label_new(NO_KIT_STRING));
  attr = pango_attr_weight_new(PANGO_WEIGHT_HEAVY);
  attr_lst = pango_attr_list_new();
  pango_attr_list_insert(attr_lst, attr);
  gtk_label_set_attributes(ui->current_kit_label, attr_lst);
  pango_attr_list_unref(attr_lst);

  opts_hbox1 = gtk_hbox_new(false,0);
  opts_hbox2 = gtk_hbox_new(false,0);
  kit_combo_box = gtk_combo_box_new_with_model(GTK_TREE_MODEL(ui->kit_store));
  kit_label = gtk_label_new("Kit:");

  no_kit_label = gtk_label_new("<b>No/Invalid Kit Selected</b>");
  gtk_label_set_use_markup(GTK_LABEL(no_kit_label),true);

  cell_rend = gtk_cell_renderer_text_new();
  gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(kit_combo_box), cell_rend, true);
  gtk_cell_layout_set_attributes(GTK_CELL_LAYOUT(kit_combo_box), cell_rend,"text",0,NULL);

  base_label = gtk_label_new("Midi Base Note <b>(C 2)</b>:");
  gtk_label_set_use_markup(GTK_LABEL(base_label),true);
  base_adj = GTK_ADJUSTMENT
    (gtk_adjustment_new(36.0, // val
			21.0,107.0, // min/max
			1.0, // step
			5.0,0.0)); // page adj/size
  base_spin = gtk_spin_button_new(base_adj, 1.0, 0);

  channel_label = gtk_label_new("Midi Channel: ");
  ui->channel_combo_box = create_channel_combo();

  position_label = gtk_label_new("Sample Zero Position: ");
  ui->position_combo_box = create_position_combo();

  ui->velocity_checkbox = gtk_check_button_new_with_label("Ignore Velocity");
  ui->note_off_checkbox = gtk_check_button_new_with_label("Ignore Note Off");

  gtk_box_pack_start(GTK_BOX(opts_hbox1),kit_label,
		     false,false,15);
  gtk_box_pack_start(GTK_BOX(opts_hbox1),no_kit_label,
		     true,true,0);
  gtk_box_pack_start(GTK_BOX(opts_hbox1),kit_combo_box,
		     true,true,0);
  gtk_box_pack_start(GTK_BOX(opts_hbox1),base_label,
		     false,false,15);
  gtk_box_pack_start(GTK_BOX(opts_hbox1),base_spin,
		     true,true,0);

  gtk_box_pack_start(GTK_BOX(opts_hbox2),channel_label,
		     false,false,15);
  gtk_box_pack_start(GTK_BOX(opts_hbox2),ui->channel_combo_box,
		     false,false,0);
  gtk_box_pack_start(GTK_BOX(opts_hbox2),position_label,
		     false,false,15);
  gtk_box_pack_start(GTK_BOX(opts_hbox2),ui->position_combo_box,
		     false,false,0);
  gtk_box_pack_start(GTK_BOX(opts_hbox2),ui->velocity_checkbox,
		     true,true,15);
  gtk_box_pack_start(GTK_BOX(opts_hbox2),ui->note_off_checkbox,
		     true,true,15);

  gtk_box_pack_start(GTK_BOX(drmr_ui_widget),GTK_WIDGET(ui->current_kit_label),
		     false,false,5);
  gtk_box_pack_start(GTK_BOX(drmr_ui_widget),opts_hbox1,
		     false,false,5);
  gtk_box_pack_start(GTK_BOX(drmr_ui_widget),opts_hbox2,
		     false,false,5);

  gtk_box_pack_start(GTK_BOX(drmr_ui_widget),gtk_hseparator_new(),
		     false,false,5);

  sample_view = gtk_scrolled_window_new(NULL, NULL);
  gtk_widget_set_size_request(sample_view, -1, 300);
  gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW(sample_view),
		     GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);
  gtk_box_pack_start(GTK_BOX(drmr_ui_widget), sample_view,
		     true, true, 5);
  
  ui->drmr_widget = drmr_ui_widget;
  ui->sample_table = NULL;
  ui->kit_combo = GTK_COMBO_BOX(kit_combo_box);
  ui->base_label = GTK_LABEL(base_label);
  ui->base_spin = GTK_SPIN_BUTTON(base_spin);
  ui->no_kit_label = no_kit_label;
  ui->sample_view = GTK_SCROLLED_WINDOW(sample_view);
  
  g_signal_connect(G_OBJECT(kit_combo_box),"changed",G_CALLBACK(kit_combobox_changed),ui);
  g_signal_connect(G_OBJECT(base_spin),"value-changed",G_CALLBACK(base_changed),ui);
  g_signal_connect(G_OBJECT(ui->channel_combo_box),"changed",G_CALLBACK(channel_combobox_changed),ui);
  g_signal_connect(G_OBJECT(ui->position_combo_box),"changed",G_CALLBACK(position_combobox_changed),ui);
  g_signal_connect(G_OBJECT(ui->velocity_checkbox),"toggled",G_CALLBACK(ignore_velocity_toggled),ui);
  g_signal_connect(G_OBJECT(ui->note_off_checkbox),"toggled",G_CALLBACK(ignore_note_off_toggled),ui);

  gtk_widget_show_all(drmr_ui_widget);
  gtk_widget_hide(no_kit_label);
}

static LV2UI_Handle
instantiate(const LV2UI_Descriptor*   descriptor,
            const char*               plugin_uri,
            const char*               bundle_path,
            LV2UI_Write_Function      write_function,
            LV2UI_Controller          controller,
            LV2UI_Widget*             widget,
            const LV2_Feature* const* features) {
  DrMrUi *ui = (DrMrUi*)malloc(sizeof(DrMrUi));

  ui->write      = write_function;
  ui->controller = controller;
  ui->drmr_widget = NULL;
  ui->map = NULL;
  ui->curKit = -1;
  ui->samples = 0;
  *widget = NULL;

  while(*features) {
    if (!strcmp((*features)->URI, LV2_URID_URI "#map"))
      ui->map = (LV2_URID_Map *)((*features)->data);
    features++;
  }
  if (!ui->map) {
    fprintf(stderr, "LV2 host does not support urid#map.\n");
    free(ui);
    return 0;
  } 
  map_drmr_uris(ui->map,&(ui->uris));

  ui->bundle_path = g_strdup(bundle_path);

  load_led_pixbufs(ui);


  lv2_atom_forge_init(&ui->forge,ui->map);

  build_drmr_ui(ui);

  ui->kits = scan_kits();
  ui->gain_quark = g_quark_from_string("drmr_gain_quark");
  ui->pan_quark = g_quark_from_string("drmr_pan_quark");
  ui->trigger_quark = g_quark_from_string("drmr_trigger_quark");
  ui->gain_sliders = NULL;
  ui->pan_sliders = NULL;
  ui->notify_leds = NULL;

  // store previous gain/pan vals to re-apply to sliders when we
  // change kits
  ui->gain_vals = malloc(32*sizeof(float));
  memset(ui->gain_vals,0,32*sizeof(float));
  ui->pan_vals  = malloc(32*sizeof(float));
  memset(ui->pan_vals,0,32*sizeof(float));
  ui->cols = 4;
  ui->forceUpdate = false;
  fill_kit_combo(ui->kit_combo, ui->kits);

#ifdef DRMR_UI_ZERO_SAMP
  ui->startSamp = DRMR_UI_ZERO_SAMP;
#else
  ui->startSamp = 0;
#endif

  *widget = ui->drmr_widget;

  return ui;
}


static void cleanup(LV2UI_Handle handle) {
  DrMrUi* ui = (DrMrUi*)handle;
  // seems qtractor likes to destory us
  // before calling, avoid double-destroy
  if (GTK_IS_WIDGET(ui->drmr_widget))
    gtk_widget_destroy(ui->drmr_widget);
  if (ui->notify_leds) free(ui->notify_leds);
  if (ui->gain_sliders) free(ui->gain_sliders);
  if (ui->pan_sliders) free(ui->pan_sliders);
  g_free(ui->bundle_path);
  if (led_on_pixbuf) g_object_unref(led_on_pixbuf);
  if (led_off_pixbuf) g_object_unref(led_off_pixbuf);
  free_kits(ui->kits);
  free(ui);
}

struct slider_callback_data {
  GtkRange* range;
  float val;
};
static gboolean slider_callback(gpointer data) {
  struct slider_callback_data *cbd = (struct slider_callback_data*)data;
  if (GTK_IS_RANGE(cbd->range))
    gtk_range_set_value(cbd->range,cbd->val);
  free(cbd);
  return FALSE; // don't keep calling
}

static void
port_event(LV2UI_Handle handle,
           uint32_t     port_index,
           uint32_t     buffer_size,
           uint32_t     format,
           const void*  buffer) {
  DrMrPortIndex index = (DrMrPortIndex)port_index;
  DrMrUi* ui = (DrMrUi*)handle;

  if (index == DRMR_CORE_EVENT) {
    if (format == ui->uris.atom_eventTransfer) {
      LV2_Atom* atom = (LV2_Atom*)buffer;
      if (atom->type == ui->uris.atom_resource) {
	LV2_Atom_Object* obj = (LV2_Atom_Object*)atom;
	if (obj->body.otype == ui->uris.get_state ||
	    obj->body.otype == ui->uris.ui_msg) {
	  // both state and ui_msg are the same at the moment
	  const LV2_Atom* path = NULL;
	  lv2_atom_object_get(obj, ui->uris.kit_path, &path, 0);
	  if (path) {
	    char *kitpath = LV2_ATOM_BODY(path);
	    if (!strncmp(kitpath, "file://", 7))
	      kitpath += 7;
	    char *realp = realpath(kitpath,NULL);
//	    fprintf(stderr, "KitPath: [%s]   RealPath: [%s]\n", kitpath, realp);
	    if (!realp) {
	      fprintf(stderr,"Passed a path I can't resolve, bailing out\n");
	      return;
	    }
	    int i;
	    for(i = 0;i < ui->kits->num_kits;i++)
	    {
//		fprintf(stderr, "CheckPath: [%s]  / [%s]\n", ui->kits->kits[i].path, realp);
	      if (!strcmp(ui->kits->kits[i].path,realp))
		break;
	    }
	    if (i < ui->kits->num_kits) {
	      ui->kitReq = i;
	      g_idle_add(kit_callback,ui);
	    } else
	      fprintf(stderr,"Couldn't find kit %s\n",realp);
	    free(realp);
	  }
	  if (obj->body.otype == ui->uris.get_state) { // read out extra state info
	    const LV2_Atom* ignvel = NULL;
	    const LV2_Atom* ignno = NULL;
	    const LV2_Atom* channel_nb = NULL;
	    const LV2_Atom* zerop = NULL;
	    lv2_atom_object_get(obj,
			   ui->uris.velocity_toggle, &ignvel,
			   ui->uris.note_off_toggle, &ignno,
			   ui->uris.channel_nb, &channel_nb,
			   ui->uris.zero_position, &zerop,
			   0);
	    if (ignvel)
	      gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(ui->velocity_checkbox),
					   ((const LV2_Atom_Bool*)ignvel)->body);
	    if (ignno)
	      gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(ui->note_off_checkbox),
					   ((const LV2_Atom_Bool*)ignno)->body);
	    if (channel_nb)
	      gtk_combo_box_set_active(GTK_COMBO_BOX(ui->channel_combo_box),
				       ((const LV2_Atom_Int*)channel_nb)->body);
	    if (zerop)
	      gtk_combo_box_set_active(GTK_COMBO_BOX(ui->position_combo_box),
				       ((const LV2_Atom_Int*)zerop)->body);
	  }
	}
	else if (obj->body.otype == ui->uris.midi_info) {
	  const LV2_Atom *midi_atom = NULL;
	  lv2_atom_object_get(obj, ui->uris.midi_event, &midi_atom, 0);
	  if(!midi_atom) {
	    fprintf(stderr,"Midi info with no midi data\n");
	    return;
	  }
	  const uint8_t *data = (const uint8_t*)midi_atom;
	  uint8_t nn = data[1] - ui->baseNote;
	  sample_triggered(ui,nn);
	}
	else
	  fprintf(stderr, "Unknown resource type passed to ui.\n");
      } else
	fprintf(stderr, "Non resource message passed to ui.\n");
    } else
      fprintf(stderr, "Unknown format.\n");
  }
  else if (index == DRMR_BASENOTE) {
    int base = (int)(*((float*)buffer));
    if (base >= 21 && base <= 107) {
      setBaseLabel((int)base);
      gtk_spin_button_set_value(ui->base_spin,base);
      gtk_label_set_markup(ui->base_label,baseLabelBuf);
      ui->baseNote = base;
    }
  }
  else if (index >= DRMR_GAIN_ONE &&
	   index <= DRMR_GAIN_THIRTYTWO) {
    float gain = *(float*)buffer;
    int idx = index-DRMR_GAIN_ONE;
    ui->gain_vals[idx] = gain;
    if (idx < ui->samples && ui->gain_sliders) {
      struct slider_callback_data* data = malloc(sizeof(struct slider_callback_data));
      data->range = GTK_RANGE(ui->gain_sliders[idx]);
      data->val = gain;
      g_idle_add(slider_callback,data);
      //GtkRange* range = GTK_RANGE(ui->gain_sliders[idx]);
      //gtk_range_set_value(range,gain);
    }
  }
  else if (index >= DRMR_PAN_ONE &&
	   index <= DRMR_PAN_THIRTYTWO) {
    float pan = *(float*)buffer;
    int idx = index-DRMR_PAN_ONE;
    ui->pan_vals[idx] = pan;
    if (idx < ui->samples && ui->pan_sliders) {
      struct slider_callback_data* data = malloc(sizeof(struct slider_callback_data));
      data->range = GTK_RANGE(ui->pan_sliders[idx]);
      data->val = pan;
      g_idle_add(slider_callback,data);
    }
  }
}

static const void*
extension_data(const char* uri) {
  return NULL;
}

static const LV2UI_Descriptor descriptor = {
  DRMR_UI_URI,
  instantiate,
  cleanup,
  port_event,
  extension_data
};

LV2_SYMBOL_EXPORT
const LV2UI_Descriptor*
lv2ui_descriptor(uint32_t index) {
  switch (index) {
  case 0:
    return &descriptor;
  default:
    return NULL;
  }
}