[gtksourceview/wip/chergert/gsv-gtk4] completion: use extra treeview for styling

[Christian Hergert <chergert src gnome org>]

commit a4006bc68603edab71fc5d11cd15d95aca592324
Author: Christian Hergert <chergert redhat com>
Date:   Tue Mar 17 10:03:46 2020 -0700

    completion: use extra treeview for styling
    
    We don't want this long term, but for now we can use it to get the theme
    information out without too much trouble.
    
    Long term, this will all be replaced with a new completion API that is
    based on GListModel, so this is mostly just temporary.
    
    Also, disable all the background styling for now since we can't do that
    given current theming APIs. We want to use widgets for all of this.

 gtksourceview/gtksourcecompletion.c  | 66 +++++++++++++++---------------------
 gtksourceview/gtksourcecompletion.ui |  3 ++
 2 files changed, 30 insertions(+), 39 deletions(-)
---
diff --git a/gtksourceview/gtksourcecompletion.c b/gtksourceview/gtksourcecompletion.c
index 6bce5012..f44ea514 100644
--- a/gtksourceview/gtksourcecompletion.c
+++ b/gtksourceview/gtksourcecompletion.c
@@ -156,6 +156,9 @@ struct _GtkSourceCompletion
        GtkImage *selection_image;
        GtkLabel *selection_label;
 
+       /* Used for insensitive styling */
+       GtkTreeView *insensitive;
+
        /* The default widget for the info window */
        GtkLabel *default_info;
 
@@ -1568,16 +1571,16 @@ static void
 style_context_changed (GtkStyleContext     *style_context,
                       GtkSourceCompletion *completion)
 {
-       PangoFontDescription *font_desc = NULL;
-
-       gtk_style_context_save (style_context);
-       gtk_style_context_set_state (style_context, GTK_STATE_FLAG_NORMAL);
+       PangoFontDescription *font_desc;
+       PangoContext *context;
 
-       gtk_style_context_get (style_context,
-                              GTK_STYLE_PROPERTY_FONT, &font_desc,
-                              NULL);
+       if (completion->view == NULL)
+       {
+               return;
+       }
 
-       gtk_style_context_restore (style_context);
+       context = gtk_widget_get_pango_context (GTK_WIDGET (completion->view));
+       font_desc = pango_context_get_font_description (context);
 
        /*
         * Work around issue where when a proposal provides "<b>markup</b>" and
@@ -1591,14 +1594,19 @@ style_context_changed (GtkStyleContext     *style_context,
         */
        if (PANGO_WEIGHT_NORMAL == pango_font_description_get_weight (font_desc))
        {
+               font_desc = pango_font_description_copy (font_desc);
                pango_font_description_unset_fields (font_desc, PANGO_FONT_MASK_WEIGHT);
+               g_object_set (completion->cell_renderer_proposal,
+                             "font-desc", font_desc,
+                             NULL);
+               pango_font_description_free (font_desc);
+       }
+       else
+       {
+               g_object_set (completion->cell_renderer_proposal,
+                             "font-desc", font_desc,
+                             NULL);
        }
-
-       g_object_set (completion->cell_renderer_proposal,
-                     "font-desc", font_desc,
-                     NULL);
-
-       pango_font_description_free (font_desc);
 }
 
 static void
@@ -2029,9 +2037,9 @@ init_tree_view (GtkSourceCompletion *completion,
        GtkTreeViewColumn *column;
        GtkCellRenderer *cell_renderer;
        GtkStyleContext *style_context;
-       GdkRGBA* background_color = NULL;
        GdkRGBA foreground_color;
 
+       completion->insensitive = GTK_TREE_VIEW (gtk_builder_get_object (builder, "insensitive"));
        completion->tree_view_proposals = GTK_TREE_VIEW (gtk_builder_get_object (builder, 
"tree_view_proposals"));
 
        g_signal_connect_swapped (completion->tree_view_proposals,
@@ -2078,23 +2086,12 @@ init_tree_view (GtkSourceCompletion *completion,
                                             "cell-background-set", 
GTK_SOURCE_COMPLETION_MODEL_COLUMN_IS_HEADER,
                                             NULL);
 
-       style_context = gtk_widget_get_style_context (GTK_WIDGET (completion->tree_view_proposals));
-
-       gtk_style_context_save (style_context);
-       gtk_style_context_set_state (style_context, GTK_STATE_FLAG_INSENSITIVE);
-
-       gtk_style_context_get (style_context,
-                              "background-color", &background_color,
-                              NULL);
-
+       /* Get styling for insensitive cell background. Ideally this will all
+        * go away with a widget'ized form of completion before GTK 4.
+        */
+       style_context = gtk_widget_get_style_context (GTK_WIDGET (completion->insensitive));
        gtk_style_context_get_color (style_context, &foreground_color);
 
-       gtk_style_context_restore (style_context);
-
-       g_object_set (cell_renderer,
-                     "cell-background-rgba", background_color,
-                     NULL);
-
        g_object_bind_property (completion, "show-icons",
                                cell_renderer, "visible",
                                G_BINDING_SYNC_CREATE);
@@ -2114,7 +2111,6 @@ init_tree_view (GtkSourceCompletion *completion,
 
        g_object_set (cell_renderer,
                      "foreground-rgba", &foreground_color,
-                     "cell-background-rgba", background_color,
                      NULL);
 
        /* Accelerators cell renderer */
@@ -2123,14 +2119,8 @@ init_tree_view (GtkSourceCompletion *completion,
 
        cell_renderer = GTK_CELL_RENDERER (gtk_builder_get_object (builder, "cell_renderer_accelerator"));
 
-       gtk_tree_view_column_set_attributes (column,
-                                            cell_renderer,
-                                            "cell-background-set", 
GTK_SOURCE_COMPLETION_MODEL_COLUMN_IS_HEADER,
-                                            NULL);
-
        g_object_set (cell_renderer,
                      "foreground-rgba", &foreground_color,
-                     "cell-background-rgba", background_color,
                      NULL);
 
        gtk_tree_view_column_set_cell_data_func (column,
@@ -2144,8 +2134,6 @@ init_tree_view (GtkSourceCompletion *completion,
                                 G_CALLBACK (accelerators_notify_cb),
                                 column,
                                 0);
-
-       gdk_rgba_free (background_color);
 }
 
 static void
diff --git a/gtksourceview/gtksourcecompletion.ui b/gtksourceview/gtksourcecompletion.ui
index 7de346ce..2a2fce81 100644
--- a/gtksourceview/gtksourcecompletion.ui
+++ b/gtksourceview/gtksourcecompletion.ui
@@ -118,4 +118,7 @@ along with this library; if not, see <http://www.gnu.org/licenses/>.
       </object>
     </child>
   </object>
+  <object class="GtkTreeView" id="insensitive">
+    <property name="sensitive">False</property>
+  </object>
 </interface>