sdtui: enable styling of defocused selected rows

The defaults are unaffected, the row is always reverse, like it used to.

Having the deselected row just be underlined seems sensible.

It isn't currently possible to change /just/ the foreground or
the background colour of the selection, due to how ncurses works
with colours.

Bumped termo to enable requesting the appropriate events.

src/sdtui.c

@@ -157,12 +157,14 @@ resolve_filename (const gchar *filename, gchar *(*relative_cb) (const char *))
 
 // --- Application -------------------------------------------------------------
 
-#define ATTRIBUTE_TABLE(XX)                            \
-	XX( HEADER, "header",        -1, -1, A_REVERSE   ) \
-	XX( ACTIVE, "header-active", -1, -1, A_UNDERLINE ) \
-	XX( SEARCH, "search",        -1, -1, A_UNDERLINE ) \
-	XX( EVEN,   "even",          -1, -1, 0           ) \
-	XX( ODD,    "odd",           -1, -1, 0           )
+#define ATTRIBUTE_TABLE(XX)                               \
+	XX( HEADER,    "header",        -1, -1, A_REVERSE   ) \
+	XX( ACTIVE,    "header-active", -1, -1, A_UNDERLINE ) \
+	XX( SEARCH,    "search",        -1, -1, A_UNDERLINE ) \
+	XX( EVEN,      "even",          -1, -1, 0           ) \
+	XX( ODD,       "odd",           -1, -1, 0           ) \
+	XX( SELECTION, "selection",     -1, -1, A_REVERSE   ) \
+	XX( DEFOCUSED, "defocused",     -1, -1, A_REVERSE   )
 
 enum
 {
@@ -210,6 +212,7 @@ struct application
 	guint           tk_timer;           ///< termo timeout timer
 	GIConv          ucs4_to_locale;     ///< UTF-32 -> locale conversion
 	gboolean        locale_is_utf8;     ///< The locale is Unicode
+	gboolean        focused;            ///< Whether the terminal has focus
 
 	GArray        * dictionaries;       ///< All loaded dictionaries
 
@@ -628,6 +631,7 @@ app_init (Application *self, char **filenames)
 #else // G_BYTE_ORDER != G_LITTLE_ENDIAN
 	self->ucs4_to_locale = g_iconv_open (charset, "UTF-32BE");
 #endif // G_BYTE_ORDER != G_LITTLE_ENDIAN
+	self->focused = TRUE;
 
 	app_init_attrs (self);
 	self->dictionaries = g_array_new (FALSE, TRUE, sizeof (Dictionary));
@@ -688,6 +692,10 @@ app_init_terminal (Application *self)
 	gboolean failed = FALSE;
 	for (int a = 0; a < ATTRIBUTE_COUNT; a++)
 	{
+		if (self->attrs[a].fg == -1 &&
+			self->attrs[a].bg == -1)
+			continue;
+
 		if (self->attrs[a].fg >= COLORS || self->attrs[a].fg < -1
 		 || self->attrs[a].bg >= COLORS || self->attrs[a].bg < -1)
 		{
@@ -988,6 +996,16 @@ app_show_help (Application *self)
 	app_show_message (self, lines, G_N_ELEMENTS (lines));
 }
 
+/// Combine attributes, taking care to replace colour bits entirely
+static void
+app_merge_attributes (int *target, int merged)
+{
+	if (merged & A_COLOR)
+		*target = (*target & ~A_COLOR) | merged;
+	else
+		*target |= merged;
+}
+
 /// Redraw the dictionary view.
 static void
 app_redraw_view (Application *self)
@@ -1014,9 +1032,14 @@ app_redraw_view (Application *self)
 		{
 			int attrs = ((self->top_position + i) & 1)
 				? APP_ATTR (ODD) : APP_ATTR (EVEN);
-			if (shown == self->selected)      attrs |= A_REVERSE;
+
+			if (shown == self->selected)
+				app_merge_attributes (&attrs, self->focused
+					? APP_ATTR (SELECTION) : APP_ATTR (DEFOCUSED));
+
 			gboolean last = k + 1 == ve->definitions_length;
-			if (last && self->underline_last) attrs |= A_UNDERLINE;
+			if (last && self->underline_last)
+				attrs |= A_UNDERLINE;
 
 			RowBuffer buf;
 			row_buffer_init (&buf, self);
@@ -1793,6 +1816,14 @@ app_process_termo_event (Application *self, termo_key_t *event)
 		return app_process_key (self, event);
 	case TERMO_TYPE_KEYSYM:
 		return app_process_keysym (self, event);
+	case TERMO_TYPE_FOCUS:
+	{
+		SAVE_CURSOR
+		self->focused = !!event->code.focused;
+		app_redraw_view (self);
+		RESTORE_CURSOR
+		return TRUE;
+	}
 	default:
 		return TRUE;
 	}

termo

@@ -1 +1 @@
-Subproject commit f7912a8ce7bbf7f701b5217bbb3879b13b66cfe7
+Subproject commit 94a77a10d87367ef33156cd68b2caf601c3f72d0