[simple-scan/wip/exalm/dark: 7/7] page-view: Handle ruler color changes in runtime

[Bartosz <bkosiorek src gnome org>]

commit 2778fe927234586dba144aaff40b77a20ef8190d
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed Jan 5 16:45:43 2022 +0500

    page-view: Handle ruler color changes in runtime

 src/book-view.vala | 13 ++++---------
 src/page-view.vala | 15 ++++++---------
 2 files changed, 10 insertions(+), 18 deletions(-)
---
diff --git a/src/book-view.vala b/src/book-view.vala
index 59e24694..df2beb4c 100644
--- a/src/book-view.vala
+++ b/src/book-view.vala
@@ -189,14 +189,7 @@ public class BookView : Gtk.Box
 
     private void add_cb (Book book, Page page)
     {
-        Gdk.RGBA page_ruler_color;
-        if (!get_style_context ().lookup_color ("theme_fg_color", out page_ruler_color))
-        {
-            warning ("Couldn't get theme_fg_color from GTK theme, needed to draw the page view ruler");
-            /* Use a bright color so that theme makers notice it. */
-            page_ruler_color.parse ("#00ff00");
-        }
-        var page_view = new PageView (page, page_ruler_color);
+        var page_view = new PageView (page);
         page_view.changed.connect (page_view_changed_cb);
         page_view.size_changed.connect (page_view_size_changed_cb);
         page_data.insert (page, page_view);
@@ -450,6 +443,8 @@ public class BookView : Gtk.Box
         for (var i = 0; i < book.n_pages; i++)
             pages.append (get_nth_page (i));
 
+        var ruler_color = get_style_context ().get_color (get_state_flags ());
+
         /* Render each page */
         foreach (var page in pages)
         {
@@ -462,7 +457,7 @@ public class BookView : Gtk.Box
 
             context.save ();
             context.translate (-x_offset, 0);
-            page.render (context);
+            page.render (context, ruler_color);
             context.restore ();
 
             if (page.selected)
diff --git a/src/page-view.vala b/src/page-view.vala
index 342df278..148dcca7 100644
--- a/src/page-view.vala
+++ b/src/page-view.vala
@@ -45,8 +45,6 @@ public class PageView : Object
         }
     }
 
-    private Gdk.RGBA ruler_color;
-
     private int ruler_width = 8;
 
     private int border_width = 2;
@@ -86,13 +84,9 @@ public class PageView : Object
     public signal void size_changed ();
     public signal void changed ();
 
-    /* It is necessary to ask the ruler color since it is themed with the GTK */
-    /* theme foreground color, and this class doesn't have any GTK widget     */
-    /* available to lookup the color. */
-    public PageView (Page page, Gdk.RGBA ruler_color)
+    public PageView (Page page)
     {
         this.page = page;
-        this.ruler_color = ruler_color;
         page.pixels_changed.connect (page_pixels_changed_cb);
         page.size_changed.connect (page_size_changed_cb);
         page.crop_changed.connect (page_overlay_changed_cb);
@@ -828,7 +822,10 @@ public class PageView : Object
         }
     }
 
-    public void render (Cairo.Context context)
+    /* It is necessary to ask the ruler color since it is themed with the GTK */
+    /* theme foreground color, and this class doesn't have any GTK widget     */
+    /* available to lookup the color. */
+    public void render (Cairo.Context context, Gdk.RGBA ruler_color)
     {
         update_animation ();
         update_page_view ();
@@ -845,7 +842,7 @@ public class PageView : Object
         context.paint ();
 
         /* Draw page border */
-        context.set_source_rgb (ruler_color.red, ruler_color.green, ruler_color.blue);
+        Gdk.cairo_set_source_rgba (context, ruler_color);
         context.set_line_width (border_width);
 
         context.rectangle (0,