Nuke GdkFont and use Pango's font measuring for everything.

2003-04-01  Hans Petter Jansson  <hpj@ximian.com>

	* e-calendar-item.c (e_calendar_item_class_init)
	(e_calendar_item_destroy)
	(e_calendar_item_get_arg)
	(e_calendar_item_set_arg)
	(e_calendar_item_update)
	(e_calendar_item_draw)
	(e_calendar_item_draw_month)
	(e_calendar_item_draw_day_numbers)
	(e_calendar_item_recalc_sizes)
	(e_calendar_item_convert_position_to_day): Nuke GdkFont and use
	Pango's font measuring for everything.

	* e-calendar-item.h: Ditto.

	* e-calendar.c (e_calendar_init)
	(e_calendar_size_allocate): Ditto.

svn path=/trunk/; revision=20633

4 files changed, 160 insertions, 130 deletions

diff --git a/widgets/misc/ChangeLog b/widgets/misc/ChangeLog
index b86d9c8943..63b86b708b 100644
--- a/widgets/misc/ChangeLog
+++ b/widgets/misc/ChangeLog
@@ -1,3 +1,22 @@
+2003-04-01  Hans Petter Jansson  <hpj@ximian.com>
+
+	* e-calendar-item.c (e_calendar_item_class_init)
+	(e_calendar_item_destroy)
+	(e_calendar_item_get_arg)
+	(e_calendar_item_set_arg)
+	(e_calendar_item_update)
+	(e_calendar_item_draw)
+	(e_calendar_item_draw_month)
+	(e_calendar_item_draw_day_numbers)
+	(e_calendar_item_recalc_sizes)
+	(e_calendar_item_convert_position_to_day): Nuke GdkFont and use
+	Pango's font measuring for everything.
+
+	* e-calendar-item.h: Ditto.
+
+	* e-calendar.c (e_calendar_init)
+	(e_calendar_size_allocate): Ditto.
+
 2003-03-30  Hans Petter Jansson  <hpj@ximian.com>
 
 	* e-calendar-item.c (e_calendar_item_destroy): Handle multiple
diff --git a/widgets/misc/e-calendar-item.c b/widgets/misc/e-calendar-item.c
index ee25c8f3bd..92bd50f466 100644
--- a/widgets/misc/e-calendar-item.c
+++ b/widgets/misc/e-calendar-item.c
@@ -231,7 +231,6 @@ enum {
 	ARG_Y1,
 	ARG_X2,
 	ARG_Y2,
-	ARG_FONT,
 	ARG_FONT_DESC,
 	ARG_WEEK_NUMBER_FONT,
 	ARG_WEEK_NUMBER_FONT_DESC,
@@ -295,15 +294,9 @@ e_calendar_item_class_init (ECalendarItemClass *class)
 	gtk_object_add_arg_type ("ECalendarItem::y2",
 				 GTK_TYPE_DOUBLE, GTK_ARG_READWRITE,
 				 ARG_Y2);
-	gtk_object_add_arg_type ("ECalendarItem::font",
-				 GTK_TYPE_POINTER, GTK_ARG_READWRITE,
-				 ARG_FONT);
 	gtk_object_add_arg_type ("ECalendarItem::font_desc",
 				 GTK_TYPE_POINTER, GTK_ARG_READWRITE,
 				 ARG_FONT_DESC);
-	gtk_object_add_arg_type ("ECalendarItem::week_number_font",
-				 GTK_TYPE_POINTER, GTK_ARG_READWRITE,
-				 ARG_WEEK_NUMBER_FONT);
 	gtk_object_add_arg_type ("ECalendarItem::week_number_font_desc",
 				 GTK_TYPE_POINTER, GTK_ARG_READWRITE,
 				 ARG_WEEK_NUMBER_FONT_DESC);
@@ -457,13 +450,14 @@ e_calendar_item_destroy		(GtkObject *o)
 		calitem->signal_emission_idle_id = 0;
 	}
 
-	if (calitem->old_font) {
-		gdk_font_unref (calitem->old_font);
-		calitem->old_font = NULL;
+	if (calitem->font_desc) {
+		pango_font_description_free (calitem->font_desc);
+		calitem->font_desc = NULL;
 	}
-	if (calitem->old_week_number_font) {
-		gdk_font_unref (calitem->old_week_number_font);
-		calitem->old_week_number_font = NULL;
+
+	if (calitem->week_number_font_desc) {
+		pango_font_description_free (calitem->week_number_font_desc);
+		calitem->week_number_font_desc = NULL;
 	}
 
 	if (GTK_OBJECT_CLASS (parent_class)->destroy)
@@ -499,15 +493,9 @@ e_calendar_item_get_arg (GtkObject *o, GtkArg *arg, guint arg_id)
 	case ARG_Y2:
 		GTK_VALUE_DOUBLE (*arg) = calitem->y2;
 		break;
-	case ARG_FONT:
-		GTK_VALUE_BOXED (*arg) = calitem->font;
-		break;
 	case ARG_FONT_DESC:
 		GTK_VALUE_BOXED (*arg) = calitem->font_desc;
 		break;
-	case ARG_WEEK_NUMBER_FONT:
-		GTK_VALUE_BOXED (*arg) = calitem->week_number_font;
-		break;
 	case ARG_WEEK_NUMBER_FONT_DESC:
 		GTK_VALUE_BOXED (*arg) = calitem->week_number_font_desc;
 		break;
@@ -563,7 +551,6 @@ e_calendar_item_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
 {
 	GnomeCanvasItem *item;
 	ECalendarItem *calitem;
-	GdkFont *font;
 	PangoFontDescription *font_desc;
 	gboolean need_update = FALSE;
 	gdouble dvalue;
@@ -612,17 +599,6 @@ e_calendar_item_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
 			need_update = TRUE;
 		}
 		break;
-	case ARG_FONT:
-		font = GTK_VALUE_BOXED (*arg);
-		if (calitem->font != font) {
-			if (calitem->font)
-				gdk_font_unref (calitem->font);
-			calitem->font = font;
-			if (font)
-				gdk_font_ref (font);
-			need_update = TRUE;
-		}
-		break;
 	case ARG_FONT_DESC:
 		font_desc = GTK_VALUE_BOXED (*arg);
 		if (calitem->font_desc)
@@ -630,17 +606,6 @@ e_calendar_item_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
 		calitem->font_desc = pango_font_description_copy (font_desc);
 		need_update = TRUE;
 		break;
-	case ARG_WEEK_NUMBER_FONT:
-		font = GTK_VALUE_BOXED (*arg);
-		if (calitem->week_number_font != font) {
-			if (calitem->week_number_font)
-				gdk_font_unref (calitem->week_number_font);
-			calitem->week_number_font = font;
-			if (font)
-				gdk_font_ref (font);
-			need_update = TRUE;
-		}
-		break;
 	case ARG_WEEK_NUMBER_FONT_DESC:
 		font_desc = GTK_VALUE_BOXED (*arg);
 		if (calitem->week_number_font_desc)
@@ -808,9 +773,11 @@ e_calendar_item_update		(GnomeCanvasItem *item,
 {
 	ECalendarItem *calitem;
 	GtkStyle *style;
-	GdkFont *font;
 	gint char_height, width, height, space, space_per_cal, space_per_cell;
 	gint rows, cols, xthickness, ythickness;
+	PangoFontDescription *font_desc;
+	PangoContext *pango_context;
+	PangoFontMetrics *font_metrics;
 
 	if (GNOME_CANVAS_ITEM_CLASS (parent_class)->update)
 		(* GNOME_CANVAS_ITEM_CLASS (parent_class)->update) (item, affine, clip_path, flags);
@@ -825,6 +792,12 @@ e_calendar_item_update		(GnomeCanvasItem *item,
 	item->x2 = calitem->x2 >= calitem->x1 ? calitem->x2 : calitem->x1;
 	item->y2 = calitem->y2 >= calitem->y1 ? calitem->y2 : calitem->y1;
 
+	/* Set up Pango prerequisites */
+	font_desc = style->font_desc;
+	pango_context = gtk_widget_get_pango_context (GTK_WIDGET (item->canvas));
+	font_metrics = pango_context_get_metrics (pango_context, font_desc,
+						  pango_context_get_language (pango_context));
+
 	/*
 	 * Calculate the new layout of the calendar.
 	 */
@@ -867,10 +840,9 @@ e_calendar_item_update		(GnomeCanvasItem *item,
 	   cells and the spaces around the calendar, otherwise we place the
 	   calendars in the center of the available area. */
 
-	font = calitem->font;
-	if (!font)
-		font = gtk_style_get_font (style);
-	char_height = font->ascent + font->descent;
+	char_height =
+		PANGO_PIXELS (pango_font_metrics_get_ascent (font_metrics)) +
+		PANGO_PIXELS (pango_font_metrics_get_descent (font_metrics));
 
 	calitem->month_width = calitem->min_month_width;
 	calitem->month_height = calitem->min_month_height;
@@ -936,10 +908,12 @@ e_calendar_item_draw		(GnomeCanvasItem *canvas_item,
 {
 	ECalendarItem *calitem;
 	GtkStyle *style;
-	GdkFont *font;
 	GdkGC *base_gc, *bg_gc;
 	gint char_height, row, col, row_y, bar_height, col_x;
 	gint xthickness, ythickness;
+	PangoFontDescription *font_desc;
+	PangoContext *pango_context;
+	PangoFontMetrics *font_metrics;
 
 #if 0
 	g_print ("In e_calendar_item_draw %i,%i %ix%i\n",
@@ -947,10 +921,18 @@ e_calendar_item_draw		(GnomeCanvasItem *canvas_item,
 #endif
 	calitem = E_CALENDAR_ITEM (canvas_item);
 	style = GTK_WIDGET (canvas_item->canvas)->style;
-	font = calitem->font;
-	if (!font)
-		font = gtk_style_get_font (style);
-	char_height = font->ascent + font->descent;
+
+	/* Set up Pango prerequisites */
+	font_desc = calitem->font_desc;
+	if (!font_desc)
+		font_desc = style->font_desc;
+	pango_context = gtk_widget_create_pango_context (GTK_WIDGET (canvas_item->canvas));
+	font_metrics = pango_context_get_metrics (pango_context, font_desc,
+						  pango_context_get_language (pango_context));
+
+	char_height =
+		PANGO_PIXELS (pango_font_metrics_get_ascent (font_metrics)) +
+		PANGO_PIXELS (pango_font_metrics_get_descent (font_metrics));
 	xthickness = style->xthickness;
 	ythickness = style->ythickness;
 	base_gc = style->base_gc[GTK_STATE_NORMAL];
@@ -1027,7 +1009,6 @@ e_calendar_item_draw_month	(ECalendarItem   *calitem,
 	GnomeCanvasItem *item;
 	GtkWidget *widget;
 	GtkStyle *style;
-	GdkFont *font;
 	PangoFontDescription *font_desc;
 	GdkGC *fg_gc;
 	struct tm tmp_tm;
@@ -1039,6 +1020,8 @@ e_calendar_item_draw_month	(ECalendarItem   *calitem,
 	gint day, day_index, cells_x, cells_y, min_cell_width, text_width;
 	gint clip_width, clip_height;
 	gchar buffer[64];
+	PangoContext *pango_context;
+	PangoFontMetrics *font_metrics;
 	PangoLayout *layout;
 
 #if 0
@@ -1048,13 +1031,18 @@ e_calendar_item_draw_month	(ECalendarItem   *calitem,
 	item = GNOME_CANVAS_ITEM (calitem);
 	widget = GTK_WIDGET (item->canvas);
 	style = widget->style;
-	font = calitem->font;
-	if (!font)
-		font = gtk_style_get_font (style);
+
+	/* Set up Pango prerequisites */
 	font_desc = calitem->font_desc;
 	if (!font_desc)
 		font_desc = style->font_desc;
-	char_height = font->ascent + font->descent;
+	pango_context = gtk_widget_get_pango_context (widget);
+	font_metrics = pango_context_get_metrics (pango_context, font_desc,
+						  pango_context_get_language (pango_context));
+
+	char_height =
+		PANGO_PIXELS (pango_font_metrics_get_ascent (font_metrics)) +
+		PANGO_PIXELS (pango_font_metrics_get_descent (font_metrics));
 	xthickness = style->xthickness;
 	ythickness = style->ythickness;
 	fg_gc = style->fg_gc[GTK_STATE_NORMAL];
@@ -1113,14 +1101,15 @@ e_calendar_item_draw_month	(ECalendarItem   *calitem,
 		/* This is a strftime() format. %B = Month name, %Y = Year. */
 		strftime (buffer, sizeof (buffer), _("%B %Y"), &tmp_tm);
 
+		pango_layout_set_font_description (layout, font_desc);
+		pango_layout_set_text (layout, buffer, -1);
+
 		/* Ideally we place the text centered in the month, but we
 		   won't go to the left of the minimum x position. */
-		text_width = gdk_string_width (font, buffer);
+		pango_layout_get_pixel_size (layout, &text_width, NULL);
 		text_x = (calitem->month_width - text_width) / 2;
 		text_x = MAX (min_x, text_x);
 
-		pango_layout_set_font_description (layout, font_desc);
-		pango_layout_set_text (layout, buffer, -1);
 		gdk_draw_layout (drawable, fg_gc,
 				 month_x + text_x,
 				 text_y,
@@ -1220,7 +1209,6 @@ e_calendar_item_draw_day_numbers (ECalendarItem	*calitem,
 	GnomeCanvasItem *item;
 	GtkWidget *widget;
 	GtkStyle *style;
-	GdkFont *font, *wkfont;
 	PangoFontDescription *font_desc, *wkfont_desc;
 	GdkGC *fg_gc;
 	GdkColor *bg_color, *fg_color, *box_color;
@@ -1237,25 +1225,30 @@ e_calendar_item_draw_day_numbers (ECalendarItem	*calitem,
 	gint today_year, today_month, today_mday, month_offset;
 	gchar buffer[2];
 	gint day_style = 0;
+	PangoContext *pango_context;
+	PangoFontMetrics *font_metrics;
 	PangoLayout *layout;
 
 	item = GNOME_CANVAS_ITEM (calitem);
 	widget = GTK_WIDGET (item->canvas);
 	style = widget->style;
-	font = calitem->font;
-	if (!font)
-		font = gtk_style_get_font (style);
+
+	/* Set up Pango prerequisites */
 	font_desc = calitem->font_desc;
 	if (!font_desc)
 		font_desc = style->font_desc;
-	wkfont = calitem->week_number_font;
-	if (!wkfont)
-		wkfont = font;
 	wkfont_desc = calitem->week_number_font_desc;
 	if (!wkfont_desc)
 		wkfont_desc = font_desc;
 	fg_gc = style->fg_gc[GTK_STATE_NORMAL];
-	char_height = font->ascent + font->descent;
+
+	pango_context = gtk_widget_get_pango_context (widget);
+	font_metrics = pango_context_get_metrics (pango_context, font_desc,
+						  pango_context_get_language (pango_context));
+
+	char_height =
+		PANGO_PIXELS (pango_font_metrics_get_ascent (font_metrics)) +
+		PANGO_PIXELS (pango_font_metrics_get_descent (font_metrics));
 
 	min_cell_width = calitem->max_digit_width * 2
 		+ E_CALENDAR_ITEM_MIN_CELL_XPAD;
@@ -1589,10 +1582,13 @@ e_calendar_item_recalc_sizes		(ECalendarItem *calitem)
 {
 	GnomeCanvasItem *canvas_item;
 	GtkStyle *style;
-	GdkFont *font, *wkfont;
 	gchar *digits = "0123456789";
 	gint day, digit, max_digit_width, max_week_number_digit_width;
 	gint char_height, width, min_cell_width, min_cell_height;
+	PangoFontDescription *font_desc, *wkfont_desc;
+	PangoContext *pango_context;
+	PangoFontMetrics *font_metrics;
+	PangoLayout *layout;
 
 	canvas_item = GNOME_CANVAS_ITEM (calitem);
 	style = GTK_WIDGET (canvas_item->canvas)->style;
@@ -1600,53 +1596,55 @@ e_calendar_item_recalc_sizes		(ECalendarItem *calitem)
 	if (!style)
 		return;
 
-	font = calitem->font;
-	if (!font)
-		font = gtk_style_get_font (style);
-	wkfont = calitem->week_number_font;
-	if (!wkfont)
-		wkfont = font;
-
-	g_return_if_fail (font != NULL);
-	g_return_if_fail (wkfont != NULL);
-
-	char_height = font->ascent + font->descent;
-
-	/* If both fonts are the same, just return. */
-	if (font != calitem->old_font
-	    || wkfont != calitem->old_week_number_font) {
-		if (calitem->old_font)
-			gdk_font_unref (calitem->old_font);
-		calitem->old_font = font;
-		gdk_font_ref (font);
-
-		if (calitem->old_week_number_font)
-			gdk_font_unref (calitem->old_week_number_font);
-		calitem->old_week_number_font = wkfont;
-		gdk_font_ref (wkfont);
-
-		for (day = 0; day < 7; day++)
-			calitem->day_widths[day] = gdk_char_width (font, calitem->days[day]);
-
-		max_digit_width = 0;
-		max_week_number_digit_width = 0;
-		for (digit = 0; digit < 10; digit++) {
-			width = gdk_char_width (font, digits[digit]);
-			calitem->digit_widths[digit] = width;
-			max_digit_width = MAX (max_digit_width, width);
-
-			if (wkfont) {
-				width = gdk_char_width (wkfont, digits[digit]);
-				calitem->week_number_digit_widths[digit] = width;
-				max_week_number_digit_width = MAX (max_week_number_digit_width, width);
-			} else {
-				calitem->week_number_digit_widths[digit] = width;
-				max_week_number_digit_width = max_digit_width;
-			}
+	/* Set up Pango prerequisites */
+	font_desc = calitem->font_desc;
+	wkfont_desc = calitem->week_number_font_desc;
+	if (!font_desc)
+		font_desc = style->font_desc;
+
+	pango_context = gtk_widget_create_pango_context (GTK_WIDGET (canvas_item->canvas));
+	font_metrics = pango_context_get_metrics (pango_context, font_desc,
+						  pango_context_get_language (pango_context));
+	layout = pango_layout_new (pango_context);
+
+
+	char_height =
+		PANGO_PIXELS (pango_font_metrics_get_ascent (font_metrics)) +
+		PANGO_PIXELS (pango_font_metrics_get_descent (font_metrics));
+
+	for (day = 0; day < 7; day++) {
+		pango_layout_set_text (layout, &calitem->days [day], 1);
+		pango_layout_get_pixel_size (layout, &calitem->day_widths [day], NULL);
+	}
+
+	max_digit_width = 0;
+	max_week_number_digit_width = 0;
+	for (digit = 0; digit < 10; digit++) {
+		pango_layout_set_text (layout, &digits [digit], 1);
+		pango_layout_get_pixel_size (layout, &width, NULL);
+
+		calitem->digit_widths[digit] = width;
+		max_digit_width = MAX (max_digit_width, width);
+
+		if (wkfont_desc) {
+			pango_context_set_font_description (pango_context, wkfont_desc);
+			pango_layout_context_changed (layout);
+
+			pango_layout_set_text (layout, &digits [digit], 1);
+			pango_layout_get_pixel_size (layout, &width, NULL);
+
+			calitem->week_number_digit_widths[digit] = width;
+			max_week_number_digit_width = MAX (max_week_number_digit_width, width);
+
+			pango_context_set_font_description (pango_context, font_desc);
+			pango_layout_context_changed (layout);
+		} else {
+			calitem->week_number_digit_widths[digit] = width;
+			max_week_number_digit_width = max_digit_width;
 		}
-		calitem->max_digit_width = max_digit_width;
-		calitem->max_week_number_digit_width = max_week_number_digit_width;
 	}
+	calitem->max_digit_width = max_digit_width;
+	calitem->max_week_number_digit_width = max_week_number_digit_width;
 
 	min_cell_width = calitem->max_digit_width * 2
 		+ E_CALENDAR_ITEM_MIN_CELL_XPAD;
@@ -1667,6 +1665,9 @@ e_calendar_item_recalc_sizes		(ECalendarItem *calitem)
 		+ char_height + E_CALENDAR_ITEM_YPAD_BELOW_DAY_LETTERS + 1
 		+ E_CALENDAR_ITEM_YPAD_ABOVE_CELLS + min_cell_height * 6
 		+ E_CALENDAR_ITEM_YPAD_BELOW_CELLS;
+
+	g_object_unref (layout);
+	g_object_unref (pango_context);
 }
 
 
@@ -2035,11 +2036,24 @@ e_calendar_item_convert_position_to_day	(ECalendarItem	*calitem,
 	gint x, y, row, col, cells_x, cells_y, day_row, day_col;
 	gint first_day_offset, days_in_month, days_in_prev_month;
 	gint week_num_x1, week_num_x2;
+	PangoFontDescription *font_desc;
+	PangoContext *pango_context;
+	PangoFontMetrics *font_metrics;
 
 	item = GNOME_CANVAS_ITEM (calitem);
 	widget = GTK_WIDGET (item->canvas);
 	style = widget->style;
-	char_height = gtk_style_get_font (style)->ascent + gtk_style_get_font (style)->descent;
+
+	font_desc = calitem->font_desc;
+	if (!font_desc)
+		font_desc = style->font_desc;
+	pango_context = gtk_widget_create_pango_context (widget);
+	font_metrics = pango_context_get_metrics (pango_context, font_desc,
+						  pango_context_get_language (pango_context));
+
+	char_height =
+		PANGO_PIXELS (pango_font_metrics_get_ascent (font_metrics)) +
+		PANGO_PIXELS (pango_font_metrics_get_descent (font_metrics));
 	xthickness = style->xthickness;
 	ythickness = style->ythickness;
 
diff --git a/widgets/misc/e-calendar-item.h b/widgets/misc/e-calendar-item.h
index a54cb2e222..a6fe161e5d 100644
--- a/widgets/misc/e-calendar-item.h
+++ b/widgets/misc/e-calendar-item.h
@@ -198,9 +198,7 @@ struct _ECalendarItem
 
 	/* Fonts for drawing text. If font isn't set it uses the font from the
 	   canvas widget. If week_number_font isn't set it uses font. */
-	GdkFont *font, *old_font;
 	PangoFontDescription *font_desc;
-	GdkFont *week_number_font, *old_week_number_font;
 	PangoFontDescription *week_number_font_desc;
 
 	ECalendarItemStyleCallback style_callback;
diff --git a/widgets/misc/e-calendar.c b/widgets/misc/e-calendar.c
index 64bffa02d9..73ddd421cc 100644
--- a/widgets/misc/e-calendar.c
+++ b/widgets/misc/e-calendar.c
@@ -131,18 +131,12 @@ static void
 e_calendar_init (ECalendar *cal)
 {
 	GnomeCanvasGroup *canvas_group;
-	GdkFont *small_font;
 	PangoFontDescription *small_font_desc;
 	GtkWidget *button, *pixmap;
 
 	GTK_WIDGET_UNSET_FLAGS (cal, GTK_CAN_FOCUS);
 
 	/* Create the small font. */
-	small_font = gdk_font_load (E_CALENDAR_SMALL_FONT);
-	if (!small_font)
-		small_font = gdk_font_load (E_CALENDAR_SMALL_FONT_FALLBACK);
-	if (!small_font)
-		g_warning ("Couldn't load font");
 
 	small_font_desc =
 		pango_font_description_copy (gtk_widget_get_style (GTK_WIDGET (cal))->font_desc);
@@ -153,13 +147,9 @@ e_calendar_init (ECalendar *cal)
 
 	cal->calitem = E_CALENDAR_ITEM (gnome_canvas_item_new (canvas_group,
 							       e_calendar_item_get_type (),
-							       "week_number_font", small_font,
 							       "week_number_font_desc", small_font_desc,
 							       NULL));
 
-	if (small_font)
-		gdk_font_unref (small_font);
-
 	pango_font_description_free (small_font_desc);
 
 	/* Create the arrow buttons to move to the previous/next month. */
@@ -306,17 +296,24 @@ e_calendar_size_allocate	(GtkWidget	*widget,
 				 GtkAllocation	*allocation)
 {
 	ECalendar *cal;
-	GdkFont *font;
+	PangoFontDescription *font_desc;
+	PangoContext *pango_context;
+	PangoFontMetrics *font_metrics;
 	gdouble old_x2, old_y2, new_x2, new_y2;
 	gdouble xthickness, ythickness, arrow_button_size;
 
 	cal = E_CALENDAR (widget);
-	font = gtk_style_get_font (widget->style);
 	xthickness = widget->style->xthickness;
 	ythickness = widget->style->ythickness;
 
 	(*GTK_WIDGET_CLASS (parent_class)->size_allocate) (widget, allocation);
 
+	/* Set up Pango prerequisites */
+	font_desc = gtk_widget_get_style (widget)->font_desc;
+	pango_context = gtk_widget_get_pango_context (widget);
+	font_metrics = pango_context_get_metrics (pango_context, font_desc,
+						  pango_context_get_language (pango_context));
+
 	/* Set the scroll region to its allocated size, if changed. */
 	gnome_canvas_get_scroll_region (GNOME_CANVAS (cal),
 					NULL, NULL, &old_x2, &old_y2);
@@ -336,7 +333,9 @@ e_calendar_size_allocate	(GtkWidget	*widget,
 
 
 	/* Position the arrow buttons. */
-	arrow_button_size = font->ascent + font->descent
+	arrow_button_size =
+		PANGO_PIXELS (pango_font_metrics_get_ascent (font_metrics))
+		+ PANGO_PIXELS (pango_font_metrics_get_descent (font_metrics))
 		+ E_CALENDAR_ITEM_YPAD_ABOVE_MONTH_NAME
 		+ E_CALENDAR_ITEM_YPAD_BELOW_MONTH_NAME
 		- E_CALENDAR_ARROW_BUTTON_Y_PAD * 2;