[nautilus/wip/antoniof/gtk4-preparation-drop-libgd: 93/100] list-view: Drop libgd usage

[António Fernandes <antoniof src gnome org>]

commit d06743694ad05aa7f55f07c98ae6b12ae7f5b644
Author: António Fernandes <antoniof gnome org>
Date:   Mon Nov 1 10:28:05 2021 +0000

    list-view: Drop libgd usage
    
    We want the text of all columns to be dimmed, except for the filename
    column. For that purpose, we use GdStyledTextRenderer, which extends
    GtkCellRendererText with support for CSS classes.
    
    However, it can't actually use the standard .dim-label style, because
    opacity is ignored, so we end up shipping an ugly css hack instead.
    
    Also, GTK 4 makes GtkCellRendererText a final class, which should not
    be subclassed.
    
    So, achieve the desired result using pango alpha attribute, which
    actually works well. (Note the final color is slightly different, but
    it's actually more faithful to the dim-label style class, so I
    believe it to be an improvement; it can be tweaked later in any case.)

 src/nautilus-list-view.c      | 18 ++++++++++--------
 src/resources/css/Adwaita.css |  6 ++----
 2 files changed, 12 insertions(+), 12 deletions(-)
---
diff --git a/src/nautilus-list-view.c b/src/nautilus-list-view.c
index 9e91b62a2..3b0342a4c 100644
--- a/src/nautilus-list-view.c
+++ b/src/nautilus-list-view.c
@@ -30,7 +30,6 @@
 #include <gdk/gdkkeysyms.h>
 #include <glib/gi18n.h>
 #include <gtk/gtk.h>
-#include <libgd/gd.h>
 #include <string.h>
 
 #define DEBUG_FLAG NAUTILUS_DEBUG_LIST_VIEW
@@ -77,6 +76,9 @@ struct SelectionForeachData
 /* We wait two seconds after row is collapsed to unload the subdirectory */
 #define COLLAPSE_TO_UNLOAD_DELAY 2
 
+/* According to Pango docs, alpha is a guint16 value between 0 and 65535. */
+#define ALPHA_55_PERCENT ((guint16) (0.55 * 0xffff))
+
 static GdkCursor *hand_cursor = NULL;
 
 static GList *nautilus_list_view_get_selection (NautilusFilesView *view);
@@ -2338,18 +2340,18 @@ create_and_set_up_tree_view (NautilusListView *view)
             }
             else
             {
-                /* We need to use libgd */
-                cell = gd_styled_text_renderer_new ();
-                /* FIXME: should be just dim-label.
-                 * See https://bugzilla.gnome.org/show_bug.cgi?id=744397
-                 */
-                gd_styled_text_renderer_add_class (GD_STYLED_TEXT_RENDERER (cell),
-                                                   "nautilus-list-dim-label");
+                PangoAttrList *attr_list = pango_attr_list_new ();
+
+                cell = gtk_cell_renderer_text_new ();
 
                 column = gtk_tree_view_column_new_with_attributes (label,
                                                                    cell,
                                                                    "text", column_num,
                                                                    NULL);
+
+                pango_attr_list_insert (attr_list, pango_attr_foreground_alpha_new (ALPHA_55_PERCENT));
+                g_object_set (cell, "attributes", attr_list, NULL);
+                pango_attr_list_unref (attr_list);
             }
 
             gtk_tree_view_column_set_alignment (column, xalign);
diff --git a/src/resources/css/Adwaita.css b/src/resources/css/Adwaita.css
index 68c3e424c..726f4e76b 100644
--- a/src/resources/css/Adwaita.css
+++ b/src/resources/css/Adwaita.css
@@ -12,13 +12,11 @@
     border-radius: 5px;
 }
 
-.nautilus-canvas-item.dim-label,
-.nautilus-list-dim-label {
+.nautilus-canvas-item.dim-label {
     color: mix (@theme_fg_color, @theme_bg_color, 0.50);
 }
 
-.nautilus-canvas-item.dim-label:selected,
-.nautilus-list-dim-label:selected {
+.nautilus-canvas-item.dim-label:selected {
     color: mix (@theme_selected_fg_color, @theme_selected_bg_color, 0.20);
 }