Add keepBorder <theme> option and enable it by default

With the new keepBorder option enabled, the
ToggleDecorations action now has 3 states:

- the first time only disables the titlebar
- the second time disables the whole SSD
- the third time enables the whole SSD again

When the keepBorder action is disabled, the old 2-state
behavior is restored, e.g. the ToggleDecorations action
only toggles between on and off.

Fixes #813

src/config/rcxml.c

@@ -575,6 +575,8 @@ entry(xmlNode *node, char *nodename, char *content)
 		rc.theme_name = xstrdup(content);
 	} else if (!strcmp(nodename, "cornerradius.theme")) {
 		rc.corner_radius = atoi(content);
+	} else if (!strcasecmp(nodename, "keepBorder.theme")) {
+		set_bool(content, &rc.ssd_keep_border);
 	} else if (!strcmp(nodename, "name.font.theme")) {
 		fill_font(nodename, content, font_place);
 	} else if (!strcmp(nodename, "size.font.theme")) {
@@ -780,6 +782,7 @@ rcxml_init(void)
 	has_run = true;
 
 	rc.xdg_shell_server_side_deco = true;
+	rc.ssd_keep_border = true;
 	rc.corner_radius = 8;
 
 	init_font_defaults(&rc.font_activewindow);

src/ssd/ssd.c

@@ -25,13 +25,19 @@ ssd_thickness(struct view *view)
 	if (!view->ssd_enabled || view->fullscreen) {
 		return (struct border){ 0 };
 	}
+
 	struct theme *theme = view->server->theme;
-	return (struct border){
+	struct border thickness = {
 		.top = theme->title_height + theme->border_width,
 		.bottom = theme->border_width,
 		.left = theme->border_width,
 		.right = theme->border_width,
 	};
+
+	if (ssd_titlebar_is_hidden(view->ssd)) {
+		thickness.top -= theme->title_height;
+	}
+	return thickness;
 }
 
 struct wlr_box
@@ -158,9 +164,14 @@ ssd_create(struct view *view, bool active)
 	ssd->view = view;
 	ssd->tree = wlr_scene_tree_create(view->scene_tree);
 	wlr_scene_node_lower_to_bottom(&ssd->tree->node);
+	ssd->titlebar.height = view->server->theme->title_height;
 	ssd_extents_create(ssd);
 	ssd_border_create(ssd);
 	ssd_titlebar_create(ssd);
+	if (rc.ssd_keep_border && view->ssd_titlebar_hidden) {
+		/* Ensure we keep the old state when exiting fullscreen */
+		ssd_titlebar_hide(ssd);
+	}
 	ssd->margin = ssd_thickness(view);
 	ssd_set_active(ssd, active);
 	ssd_enable_keybind_inhibit_indicator(ssd, view->inhibits_keybinds);
@@ -198,6 +209,25 @@ ssd_update_geometry(struct ssd *ssd)
 	ssd->state.geometry = current;
 }
 
+bool
+ssd_titlebar_is_hidden(struct ssd *ssd)
+{
+	return ssd && !ssd->titlebar.tree->node.enabled;
+}
+
+void
+ssd_titlebar_hide(struct ssd *ssd)
+{
+	if (!ssd || !ssd->titlebar.tree->node.enabled) {
+		return;
+	}
+	wlr_scene_node_set_enabled(&ssd->titlebar.tree->node, false);
+	ssd->titlebar.height = 0;
+	ssd_border_update(ssd);
+	ssd_extents_update(ssd);
+	ssd->margin = ssd_thickness(ssd->view);
+}
+
 void
 ssd_destroy(struct ssd *ssd)
 {

src/ssd/ssd_border.c

@@ -44,7 +44,7 @@ ssd_border_create(struct ssd *ssd)
 		add_scene_rect(&subtree->parts, LAB_SSD_PART_TOP, parent,
 			width - 2 * SSD_BUTTON_WIDTH, theme->border_width,
 			theme->border_width + SSD_BUTTON_WIDTH,
-			-(theme->title_height + theme->border_width), color);
+			-(ssd->titlebar.height + theme->border_width), color);
 	} FOR_EACH_END
 }
 
@@ -82,9 +82,19 @@ ssd_border_update(struct ssd *ssd)
 					0, height);
 				continue;
 			case LAB_SSD_PART_TOP:
-				wlr_scene_rect_set_size(rect,
-					width - 2 * SSD_BUTTON_WIDTH,
-					theme->border_width);
+				if (ssd->titlebar.height > 0) {
+					wlr_scene_rect_set_size(rect,
+						width - 2 * SSD_BUTTON_WIDTH,
+						theme->border_width);
+					wlr_scene_node_set_position(part->node,
+						theme->border_width + SSD_BUTTON_WIDTH,
+						-(ssd->titlebar.height + theme->border_width));
+				} else {
+					wlr_scene_rect_set_size(rect,
+						full_width, theme->border_width);
+					wlr_scene_node_set_position(part->node,
+						0, -theme->border_width);
+				}
 				continue;
 			default:
 				continue;

src/ssd/ssd_extents.c

@@ -41,7 +41,7 @@ ssd_extents_create(struct ssd *ssd)
 	wl_list_init(&ssd->extents.parts);
 	wlr_scene_node_set_position(&parent->node,
 		-(theme->border_width + extended_area),
-		-(theme->title_height + theme->border_width + extended_area));
+		-(ssd->titlebar.height + theme->border_width + extended_area));
 
 	/* Initialize parts and set constant values for targeted geometry */
 	struct ssd_part *p;
@@ -110,7 +110,7 @@ ssd_extents_update(struct ssd *ssd)
 
 	int width = view->current.width;
 	int height = view->current.height;
-	int full_height = height + theme->border_width * 2 + theme->title_height;
+	int full_height = height + theme->border_width * 2 + ssd->titlebar.height;
 	int full_width = width + 2 * theme->border_width;
 	int extended_area = SSD_EXTENDED_AREA;
 	int corner_size = extended_area + theme->border_width + SSD_BUTTON_WIDTH / 2;
@@ -122,6 +122,11 @@ ssd_extents_update(struct ssd *ssd)
 	struct ssd_part *part;
 	struct wlr_scene_rect *rect;
 
+	/* Make sure we update the y offset based on titlebar shown / hidden */
+	wlr_scene_node_set_position(&ssd->extents.tree->node,
+		-(theme->border_width + extended_area),
+		-(ssd->titlebar.height + theme->border_width + extended_area));
+
 	/* Convert usable area into layout coordinates */
 	struct wlr_box usable_area = view->output->usable_area;
 	usable_area.x += l_output->x;

src/ssd/ssd_titlebar.c

@@ -34,9 +34,11 @@ ssd_titlebar_create(struct ssd *ssd)
 	struct wlr_buffer *maximize_button_unpressed;
 	struct wlr_buffer *close_button_unpressed;
 
+	ssd->titlebar.tree = wlr_scene_tree_create(ssd->tree);
+
 	struct ssd_sub_tree *subtree;
 	FOR_EACH_STATE(ssd, subtree) {
-		subtree->tree = wlr_scene_tree_create(ssd->tree);
+		subtree->tree = wlr_scene_tree_create(ssd->titlebar.tree);
 		parent = subtree->tree;
 		wlr_scene_node_set_position(&parent->node, 0, -theme->title_height);
 		if (subtree == &ssd->titlebar.active) {
@@ -138,7 +140,7 @@ ssd_titlebar_update(struct ssd *ssd)
 void
 ssd_titlebar_destroy(struct ssd *ssd)
 {
-	if (!ssd->titlebar.active.tree) {
+	if (!ssd->titlebar.tree) {
 		return;
 	}
 
@@ -153,6 +155,9 @@ ssd_titlebar_destroy(struct ssd *ssd)
 		free(ssd->state.title.text);
 		ssd->state.title.text = NULL;
 	}
+
+	wlr_scene_node_destroy(&ssd->titlebar.tree->node);
+	ssd->titlebar.tree = NULL;
 }
 
 /*

src/view.c

@@ -658,6 +658,15 @@ void
 view_toggle_decorations(struct view *view)
 {
 	assert(view);
+	if (rc.ssd_keep_border && view->ssd_enabled && view->ssd
+			&& !ssd_titlebar_is_hidden(view->ssd)) {
+		ssd_titlebar_hide(view->ssd);
+		view->ssd_titlebar_hidden = true;
+		if (!view_is_floating(view)) {
+			view_apply_special_geometry(view);
+		}
+		return;
+	}
 	view_set_decorations(view, !view->ssd_enabled);
 }
 
@@ -748,6 +757,7 @@ view_set_decorations(struct view *view, bool decorations)
 			decorate(view);
 		} else {
 			undecorate(view);
+			view->ssd_titlebar_hidden = false;
 		}
 		if (!view_is_floating(view)) {
 			view_apply_special_geometry(view);