[WIP] Allow building with GTK+ 3.16+.

Set CMake option `ENABLE_GTK3` to `ON` to build with GTK+ 3.0.

In GTK3 mode:

- Use `GtkGrid` instead of `GtkTable`
- Don't use `GtkMisc` to set `GtkLabel`'s alignments
- `PianoKeyboard`'s draw() code still needs to be refactored (doesn't
  show key presses).
- Grab keyboard functionality still needs to be ported (doesn't work
  yet).

CMakeLists.txt

@@ -27,6 +27,9 @@
 #
 cmake_minimum_required(VERSION 2.8)
 
+option(ENABLE_GTK2 "Enable GTK2 Version" ON)
+option(ENABLE_GTK3 "Enable GTK3 Version" OFF)
+
 set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/")
 set(VERSION "2.7.2")
 
@@ -38,9 +41,20 @@ project(jack-keyboard)
 
 add_executable(jack-keyboard src/jack-keyboard src/pianokeyboard)
 
-find_package(GTK2 2.20 REQUIRED gtk)
+find_package(PkgConfig REQUIRED)
+
+if(ENABLE_GTK3)
+  set(ENABLE_GTK2 OFF)
+  PKG_CHECK_MODULES(GTK3 "gtk+-3.0 >= 3.16" REQUIRED)
+  include_directories(${GTK3_INCLUDE_DIRS})
+  target_link_libraries(jack-keyboard ${GTK3_LIBRARIES})
+endif()
+
+if(ENABLE_GTK2)
+  PKG_CHECK_MODULES(GTK2 "gtk+-2.0 >= 2.20" REQUIRED)
   include_directories(${GTK2_INCLUDE_DIRS})
   target_link_libraries(jack-keyboard ${GTK2_LIBRARIES})
+endif()
 
 # In preparation for GTK+3:
 # Set GDK/GTK+ flags to report deprecated includes and symbols.

src/jack-keyboard.c

@@ -1039,6 +1039,7 @@ int grab_x_error_handler(Display *dpy, XErrorEvent *notused)
 GdkFilterReturn
 keyboard_grab_filter(GdkXEvent *xevent, GdkEvent *event, gpointer notused)
 {
+#if !GTK_CHECK_VERSION(3,0,0)
 	XEvent *xe;
 	XKeyEvent *xke;
 
@@ -1051,14 +1052,16 @@ keyboard_grab_filter(GdkXEvent *xevent, GdkEvent *event, gpointer notused)
 
 	/* Lie to GDK, pretending we are the proper recipient of this XEvent.  Without it,
 	   GDK would discard it. */
-	xke->window = GDK_WINDOW_XWINDOW(gtk_widget_get_window(window));
+	xke->window = GDK_WINDOW_XID(gtk_widget_get_window(window));
 
+#endif /* GTK_CHECK_VERSION */
 	return (GDK_FILTER_CONTINUE);
 }
 
 void
 ungrab_keyboard(void)
 {
+#if !GTK_CHECK_VERSION(3,0,0)
 	static int (*standard_x_error_handler)(Display *dpy, XErrorEvent *notused);
 
 	standard_x_error_handler = XSetErrorHandler(grab_x_error_handler);
@@ -1069,11 +1072,13 @@ ungrab_keyboard(void)
 	XSetErrorHandler(standard_x_error_handler);
 
 	keyboard_grabbed = 0;
+#endif /* GTK_CHECK_VERSION */
 }
 
 void
 grab_keyboard(void)
 {
+#if !GTK_CHECK_VERSION(3,0,0)
 	int i;
 	static int (*standard_x_error_handler)(Display *dpy, XErrorEvent *notused);
 
@@ -1129,6 +1134,7 @@ grab_keyboard(void)
 	}
 
 	gdk_window_add_filter(NULL, keyboard_grab_filter, NULL);
+#endif /* GTK_CHECK_VERSION */
 }
 
 #else /* ! HAVE_X11 */
@@ -1550,49 +1556,102 @@ init_gtk_1(int *argc, char ***argv)
 void
 init_gtk_2(void)
 {
+#if GTK_CHECK_VERSION(3,0,0)
+	GtkWidget *grid;
+#else
 	GtkTable *table;
+#endif
 	GtkWidget *label;
 	GtkCellRenderer *renderer;
 
+#if GTK_CHECK_VERSION(3,0,0)
+	grid = gtk_grid_new();
+	gtk_grid_set_row_spacing(GTK_GRID(grid), 5);
+	gtk_grid_set_column_spacing(GTK_GRID(grid), 5);
+#else
 	/* Table. */
 	table = GTK_TABLE(gtk_table_new(4, 8, FALSE));
 	gtk_table_set_row_spacings(table, 5);
 	gtk_table_set_col_spacings(table, 5);
+#endif
 
 	if (enable_gui)
+#if GTK_CHECK_VERSION(3,0,0)
+		gtk_container_add(GTK_CONTAINER(window), grid);
+#else
 		gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(table));
+#endif
 
 	/* Channel label and spin. */
 	label = gtk_label_new("Channel:");
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_hexpand(label, TRUE);
+	gtk_label_set_xalign(GTK_LABEL(label), 1);
+	gtk_container_add(GTK_CONTAINER(grid), label);
+#else
 	gtk_misc_set_alignment(GTK_MISC(label), 1, 0.5);
 	gtk_table_attach(table, label, 0, 1, 0, 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+#endif
 	channel_spin = gtk_spin_button_new_with_range(1, CHANNEL_MAX, 1);
 	gtk_widget_set_can_focus(channel_spin, FALSE);
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_hexpand(channel_spin, TRUE);
+	gtk_grid_attach_next_to(GTK_GRID(grid), channel_spin, label, GTK_POS_RIGHT, 1, 1);
+#else
 	gtk_table_attach(table, channel_spin, 1, 2, 0, 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+#endif
 	g_signal_connect(G_OBJECT(channel_spin), "value-changed", G_CALLBACK(channel_event_handler), NULL);
 
 	/* Bank label and spin. */
 	label = gtk_label_new("Bank:");
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_hexpand(label, TRUE);
+	gtk_label_set_xalign(GTK_LABEL(label), 1);
+	gtk_grid_attach_next_to(GTK_GRID(grid), label, channel_spin, GTK_POS_RIGHT, 1, 1);
+#else
 	gtk_misc_set_alignment(GTK_MISC(label), 1, 0.5);
 	gtk_table_attach(table, label, 2, 3, 0, 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+#endif
 	bank_spin = gtk_spin_button_new_with_range(0, BANK_MAX, 1);
 	gtk_widget_set_can_focus(bank_spin, FALSE);
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_hexpand(bank_spin, TRUE);
+	gtk_grid_attach_next_to(GTK_GRID(grid), bank_spin, label, GTK_POS_RIGHT, 1, 1);
+#else
 	gtk_table_attach(table, bank_spin, 3, 4, 0, 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+#endif
 	g_signal_connect(G_OBJECT(bank_spin), "value-changed", G_CALLBACK(bank_event_handler), NULL);
 
 	/* Program label and spin. */
 	label = gtk_label_new("Program:");
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_hexpand(label, TRUE);
+	gtk_label_set_xalign(GTK_LABEL(label), 1);
+	gtk_grid_attach_next_to(GTK_GRID(grid), label, bank_spin, GTK_POS_RIGHT, 1, 1);
+#else
 	gtk_misc_set_alignment(GTK_MISC(label), 1, 0.5);
 	gtk_table_attach(table, label, 4, 5, 0, 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+#endif
 	program_spin = gtk_spin_button_new_with_range(0, PROGRAM_MAX, 1);
 	gtk_widget_set_can_focus(program_spin, FALSE);
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_hexpand(program_spin, TRUE);
+	gtk_grid_attach_next_to(GTK_GRID(grid), program_spin, label, GTK_POS_RIGHT, 1, 1);
+#else
 	gtk_table_attach(table, program_spin, 5, 6, 0, 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+#endif
 	g_signal_connect(G_OBJECT(program_spin), "value-changed", G_CALLBACK(program_event_handler), NULL);
 
 	/* "Connected to" label and combo box. */
 	label = gtk_label_new("Connected to:");
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_hexpand(label, TRUE);
+	gtk_label_set_xalign(GTK_LABEL(label), 1);
+	gtk_grid_attach_next_to(GTK_GRID(grid), label, program_spin, GTK_POS_RIGHT, 1, 1);
+#else
 	gtk_misc_set_alignment(GTK_MISC(label), 1, 0.5);
 	gtk_table_attach(table, label, 6, 7, 0, 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+#endif
 
 	connected_to_store = gtk_list_store_new(1, G_TYPE_STRING);
 	connected_to_combo = gtk_combo_box_new_with_model(GTK_TREE_MODEL(connected_to_store));
@@ -1602,54 +1661,109 @@ init_gtk_2(void)
 	gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT(connected_to_combo), renderer, "text", 0, NULL);
 
 	gtk_widget_set_can_focus(connected_to_combo, FALSE);
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_focus_on_click(connected_to_combo, FALSE);
+	gtk_widget_set_hexpand(connected_to_combo, TRUE);
+	gtk_grid_attach_next_to(GTK_GRID(grid), connected_to_combo, label, GTK_POS_RIGHT, 1, 1);
+#else
 	gtk_combo_box_set_focus_on_click(GTK_COMBO_BOX(connected_to_combo), FALSE);
 	gtk_table_attach(table, connected_to_combo, 7, 8, 0, 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+#endif
 	gtk_widget_set_size_request(GTK_WIDGET(connected_to_combo), 200, -1);
 	g_signal_connect(G_OBJECT(connected_to_combo), "changed", G_CALLBACK(connected_to_event_handler), NULL);
 
 	/* Octave label and spin. */
 	label = gtk_label_new("Octave:");
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_hexpand(label, TRUE);
+	gtk_label_set_xalign(GTK_LABEL(label), 1);
+	gtk_grid_attach(GTK_GRID(grid), label, 0, 1, 1, 1);
+#else
 	gtk_misc_set_alignment(GTK_MISC(label), 1, 0.5);
 	gtk_table_attach(table, label, 0, 1, 1, 2, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+#endif
 	octave_spin = gtk_spin_button_new_with_range(OCTAVE_MIN, OCTAVE_MAX, 1);
 	gtk_widget_set_can_focus(octave_spin, FALSE);
 	gtk_spin_button_set_value(GTK_SPIN_BUTTON(octave_spin), octave);
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_hexpand(octave_spin, TRUE);
+	gtk_grid_attach_next_to(GTK_GRID(grid), octave_spin, label, GTK_POS_RIGHT, 1, 1);
+#else
 	gtk_table_attach(table, octave_spin, 1, 2, 1, 2, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+#endif
 	g_signal_connect(G_OBJECT(octave_spin), "value-changed", G_CALLBACK(octave_event_handler), NULL);
 
 	/* "Grab keyboard" label and checkbutton. */
 	label = gtk_label_new("Grab keyboard:");
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_hexpand(label, TRUE);
+	gtk_label_set_xalign(GTK_LABEL(label), 1);
+	gtk_grid_attach(GTK_GRID(grid), label, 4, 1, 1, 1);
+#else
 	gtk_misc_set_alignment(GTK_MISC(label), 1, 0.5);
 	gtk_table_attach(table, label, 4, 5, 1, 2, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+#endif
 	grab_keyboard_checkbutton = gtk_check_button_new();
 	gtk_widget_set_can_focus(grab_keyboard_checkbutton, FALSE);
 	g_signal_connect(G_OBJECT(grab_keyboard_checkbutton), "toggled", G_CALLBACK(grab_keyboard_handler), NULL);
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_hexpand(grab_keyboard_checkbutton, TRUE);
+	gtk_grid_attach_next_to(GTK_GRID(grid), grab_keyboard_checkbutton, label, GTK_POS_RIGHT, 1, 1);
+#else
 	gtk_table_attach(table, grab_keyboard_checkbutton, 5, 6, 1, 2, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+#endif
 
 	/* Velocity label and hscale */
 	label = gtk_label_new("Velocity:");
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_hexpand(label, TRUE);
+	gtk_label_set_xalign(GTK_LABEL(label), 1);
+	gtk_grid_attach_next_to(GTK_GRID(grid), label, grab_keyboard_checkbutton, GTK_POS_RIGHT, 1, 1);
+
+	velocity_hscale = gtk_scale_new_with_range(GTK_ORIENTATION_HORIZONTAL, VELOCITY_MIN, VELOCITY_MAX, 1);
+#else
 	gtk_misc_set_alignment(GTK_MISC(label), 1, 0.5);
 	gtk_table_attach(table, label, 6, 7, 1, 2, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
 
 	velocity_hscale = gtk_hscale_new_with_range(VELOCITY_MIN, VELOCITY_MAX, 1);
+#endif
 	gtk_scale_set_draw_value(GTK_SCALE(velocity_hscale), FALSE);
 	gtk_widget_set_can_focus(velocity_hscale, FALSE);
 	g_signal_connect(G_OBJECT(velocity_hscale), "value-changed", G_CALLBACK(velocity_event_handler), NULL);
 	gtk_range_set_value(GTK_RANGE(velocity_hscale), VELOCITY_NORMAL);
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_hexpand(velocity_hscale, TRUE);
+	gtk_grid_attach_next_to(GTK_GRID(grid), velocity_hscale, label, GTK_POS_RIGHT, 1, 1);
+#else
 	gtk_table_attach(table, velocity_hscale, 7, 8, 1, 2, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+#endif
 	gtk_widget_set_size_request(GTK_WIDGET(velocity_hscale), 200, -1);
 
 	/* Sustain. It's a toggle button, not an ordinary one, because we want gtk_whatever_set_active() to work.*/
 	sustain_button = gtk_toggle_button_new_with_label("Sustain");
+#if GTK_CHECK_VERSION(3,0,0)
+	gtk_widget_set_focus_on_click(sustain_button, FALSE);
+	gtk_widget_set_hexpand(sustain_button, TRUE);
+	gtk_grid_attach(GTK_GRID(grid), sustain_button, 0, 2, 8, 1);
+#else
 	gtk_button_set_focus_on_click(GTK_BUTTON(sustain_button), FALSE);
 	gtk_table_attach(table, sustain_button, 0, 8, 2, 3, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+#endif
 	g_signal_connect(G_OBJECT(sustain_button), "toggled", G_CALLBACK(sustain_event_handler), NULL);
 
 	/* PianoKeyboard widget. */
 	keyboard = PIANO_KEYBOARD(piano_keyboard_new());
 
 	if (enable_gui)
+#if GTK_CHECK_VERSION(3,0,0)
+	{
+		gtk_widget_set_hexpand(GTK_WIDGET(keyboard), TRUE);
+		gtk_widget_set_vexpand(GTK_WIDGET(keyboard), TRUE);
+		gtk_grid_attach(GTK_GRID(grid), GTK_WIDGET(keyboard), 0, 3, 8, 1);
+	}
+#else
 		gtk_table_attach_defaults(table, GTK_WIDGET(keyboard), 0, 8, 3, 4);
+#endif
 	else
 		gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(keyboard));
 

src/pianokeyboard.c

@@ -75,7 +75,11 @@ draw_keyboard_cue(PianoKeyboard *pk)
 }
 
 static void
+#if GTK_CHECK_VERSION(3,0,0)
+draw_note(PianoKeyboard *pk, cairo_t *cr, int note)
+#else
 draw_note(PianoKeyboard *pk, int note)
+#endif
 {
 	if (note < pk->min_note)
 		return;
@@ -83,6 +87,13 @@ draw_note(PianoKeyboard *pk, int note)
 		return;
 	int is_white, x, w, h;
 
+#if GTK_CHECK_VERSION(3,0,0)
+	if (!cr)
+		cr = gdk_cairo_create(gtk_widget_get_window(GTK_WIDGET(pk)));
+
+	GdkRGBA black = { .red = 0.0, .green = 0.0, .blue = 0.0, .alpha = 1.0};
+	GdkRGBA white = { .red = 1.0, .green = 1.0, .blue = 1.0, .alpha = 1.0};
+#else
 	cairo_t *cr = gdk_cairo_create(gtk_widget_get_window(GTK_WIDGET(pk)));
 
 	GdkColor black = {0, 0, 0, 0};
@@ -90,6 +101,7 @@ draw_note(PianoKeyboard *pk, int note)
 
 	GtkWidget *widget;
 	GtkAllocation allocation;
+#endif
 
 	is_white = pk->notes[note].white;
 
@@ -101,26 +113,47 @@ draw_note(PianoKeyboard *pk, int note)
 		is_white = !is_white;
 
 	if (is_white)
+#if GTK_CHECK_VERSION(3,0,0)
+		gdk_cairo_set_source_rgba(cr, &white);
+#else
 		gdk_cairo_set_source_color(cr, &white);
+#endif
 	else
+#if GTK_CHECK_VERSION(3,0,0)
+		gdk_cairo_set_source_rgba(cr, &black);
+#else
 		gdk_cairo_set_source_color(cr, &black);
+#endif
 
 	cairo_rectangle(cr, x, 0, w, h);
 	cairo_fill(cr);
+#if GTK_CHECK_VERSION(3,0,0)
+	gdk_cairo_set_source_rgba(cr, &black);
+#else
 	gdk_cairo_set_source_color(cr, &black);
+#endif
 	cairo_rectangle(cr, x, 0, w, h);
 	cairo_stroke(cr);
 
+#if !GTK_CHECK_VERSION(3,0,0)
 	cairo_destroy(cr);
+#endif
 
 	if (pk->enable_keyboard_cue)
 		draw_keyboard_cue(pk);
 
 	/* We need to redraw black keys that partially obscure the white one. */
 	if (note < NNOTES - 2 && !pk->notes[note + 1].white)
+#if GTK_CHECK_VERSION(3,0,0)
+		draw_note(pk, cr, note + 1);
+#else
 		draw_note(pk, note + 1);
+#endif
 
 	if (note > 0 && !pk->notes[note - 1].white)
+#if GTK_CHECK_VERSION(3,0,0)
+		draw_note(pk, cr, note - 1);
+#else
 		draw_note(pk, note - 1);
 
 	/*
@@ -134,6 +167,7 @@ draw_note(PianoKeyboard *pk, int note)
 	gtk_paint_shadow(gtk_widget_get_style(widget), gtk_widget_get_window(widget), GTK_STATE_NORMAL, GTK_SHADOW_IN, NULL,
 	    widget, NULL, pk->widget_margin, 0, allocation.width - pk->widget_margin * 2 + 1,
 	    allocation.height);
+#endif
 }
 
 static int
@@ -156,7 +190,11 @@ press_key(PianoKeyboard *pk, int key)
 	pk->notes[key].pressed = 1;
 
 	g_signal_emit_by_name(GTK_WIDGET(pk), "note-on", key);
+#if GTK_CHECK_VERSION(3,0,0)
+	draw_note(pk, NULL, key);
+#else
 	draw_note(pk, key);
+#endif
 
 	return (1);
 }
@@ -181,7 +219,11 @@ release_key(PianoKeyboard *pk, int key)
 		return (0);
 
 	g_signal_emit_by_name(GTK_WIDGET(pk), "note-off", key);
+#if GTK_CHECK_VERSION(3,0,0)
+	draw_note(pk, NULL, key);
+#else
 	draw_note(pk, key);
+#endif
 
 	return (1);
 }
@@ -195,7 +237,11 @@ stop_unsustained_notes(PianoKeyboard *pk)
 		if (pk->notes[i].pressed && !pk->notes[i].sustained) {
 			pk->notes[i].pressed = 0;
 			g_signal_emit_by_name(GTK_WIDGET(pk), "note-off", i);
+#if GTK_CHECK_VERSION(3,0,0)
+			draw_note(pk, NULL, i);
+#else
 			draw_note(pk, i);
+#endif
 		}
 	}
 }
@@ -210,7 +256,11 @@ stop_sustained_notes(PianoKeyboard *pk)
 			pk->notes[i].pressed = 0;
 			pk->notes[i].sustained = 0;
 			g_signal_emit_by_name(GTK_WIDGET(pk), "note-off", i);
+#if GTK_CHECK_VERSION(3,0,0)
+			draw_note(pk, NULL, i);
+#else
 			draw_note(pk, i);
+#endif
 		}
 	}
 }
@@ -420,23 +470,45 @@ mouse_motion_event_handler(PianoKeyboard *pk, GdkEventMotion *event, gpointer no
 }
 
 static gboolean
+#if GTK_CHECK_VERSION(3,0,0)
+piano_keyboard_draw(GtkWidget *widget, cairo_t *cr)
+#else
 piano_keyboard_expose(GtkWidget *widget, GdkEventExpose *event)
+#endif
 {
 	int i;
 	PianoKeyboard *pk = PIANO_KEYBOARD(widget);
 
 	for (i = 0; i < NNOTES; i++)
+#if GTK_CHECK_VERSION(3,0,0)
+		draw_note(pk, NULL, i);
+#else
 		draw_note(pk, i);
+#endif
 
 	return (TRUE);
 }
 
+#if GTK_CHECK_VERSION(3,0,0)
+static void
+piano_keyboard_get_preferred_width(GtkWidget *widget, gint *minimal_width, gint *natural_width)
+{
+	*minimal_width = *natural_width = PIANO_KEYBOARD_DEFAULT_WIDTH;
+}
+
+static void
+piano_keyboard_get_preferred_height(GtkWidget *widget, gint *minimal_height, gint *natural_height)
+{
+	*minimal_height = *natural_height = PIANO_KEYBOARD_DEFAULT_HEIGHT;
+}
+#else
 static void
 piano_keyboard_size_request(GtkWidget *widget, GtkRequisition *requisition)
 {
 	requisition->width = PIANO_KEYBOARD_DEFAULT_WIDTH;
 	requisition->height = PIANO_KEYBOARD_DEFAULT_HEIGHT;
 }
+#endif
 
 static int is_black(int key)
 {
@@ -544,8 +616,14 @@ piano_keyboard_class_init(PianoKeyboardClass *klass)
 
 	widget_klass = (GtkWidgetClass*)klass;
 
+#if GTK_CHECK_VERSION(3,0,0)
+	widget_klass->draw = piano_keyboard_draw;
+	widget_klass->get_preferred_width = piano_keyboard_get_preferred_width;
+	widget_klass->get_preferred_height = piano_keyboard_get_preferred_height;
+#else
 	widget_klass->expose_event = piano_keyboard_expose;
 	widget_klass->size_request = piano_keyboard_size_request;
+#endif
 	widget_klass->size_allocate = piano_keyboard_size_allocate;
 }
 
@@ -638,7 +716,11 @@ piano_keyboard_set_note_on(PianoKeyboard *pk, int note)
 {
 	if (pk->notes[note].pressed == 0) {
 		pk->notes[note].pressed = 1;
+#if GTK_CHECK_VERSION(3,0,0)
+		draw_note(pk, NULL, note);
+#else
 		draw_note(pk, note);
+#endif
 	}
 }
 
@@ -648,7 +730,11 @@ piano_keyboard_set_note_off(PianoKeyboard *pk, int note)
 	if (pk->notes[note].pressed || pk->notes[note].sustained) {
 		pk->notes[note].pressed = 0;
 		pk->notes[note].sustained = 0;
+#if GTK_CHECK_VERSION(3,0,0)
+		draw_note(pk, NULL, note);
+#else
 		draw_note(pk, note);
+#endif
 	}
 }