[gitg] diff-view: handle dark themes

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 1c5d5b10173740ba87584c55a8bfe494eac72767
Author: Ignacio Casal Quinteiro <icq gnome org>
Date:   Thu Dec 17 09:08:31 2015 +0100

    diff-view: handle dark themes

 libgitg/gitg-diff-view-hunk.vala |   44 +++++++++++++++++++++++++------------
 1 files changed, 30 insertions(+), 14 deletions(-)
---
diff --git a/libgitg/gitg-diff-view-hunk.vala b/libgitg/gitg-diff-view-hunk.vala
index 7632d84..1a3747c 100644
--- a/libgitg/gitg-diff-view-hunk.vala
+++ b/libgitg/gitg-diff-view-hunk.vala
@@ -126,11 +126,6 @@ class Gitg.DiffViewHunk : Gtk.Grid
 
                if (handle_selection)
                {
-                       var selection_attributes = new Gtk.SourceMarkAttributes();
-
-                       selection_attributes.background = Gdk.RGBA() { red = 168.0 / 255.0, green = 207.0 / 
255.0, blue = 214.0 / 255.0, alpha = 1.0 };
-                       d_sourceview_hunk.set_mark_attributes(d_selection_category, selection_attributes, 0);
-
                        d_sourceview_hunk.button_press_event.connect(button_press_event_on_view);
                        d_sourceview_hunk.motion_notify_event.connect(motion_notify_event_on_view);
                        d_sourceview_hunk.button_release_event.connect(button_release_event_on_view);
@@ -144,6 +139,36 @@ class Gitg.DiffViewHunk : Gtk.Grid
 
                d_label_hunk.style_updated.connect(update_top_window_size);
                update_top_window_size();
+
+               var settings = Gtk.Settings.get_default();
+               settings.notify["gtk-application-prefer-dark-theme"].connect(update_theme);
+               update_theme();
+       }
+
+       private void update_theme()
+       {
+               var selection_attributes = new Gtk.SourceMarkAttributes();
+               var added_attributes = new Gtk.SourceMarkAttributes();
+               var removed_attributes = new Gtk.SourceMarkAttributes();
+
+               var settings = Gtk.Settings.get_default();
+
+               if (settings.gtk_application_prefer_dark_theme)
+               {
+                       selection_attributes.background = Gdk.RGBA() { red = 52.0 / 255.0, green = 101.0 / 
255.0, blue = 164.0 / 255.0, alpha = 1.0 };
+                       added_attributes.background = Gdk.RGBA() { red = 164.0 / 255.0, green = 0.0, blue = 
0.0, alpha = 1.0 };
+                       removed_attributes.background = Gdk.RGBA() { red = 78.0 / 255.0, green = 154.0 / 
255.0, blue = 6.0 / 255.0, alpha = 1.0 };
+               }
+               else
+               {
+                       selection_attributes.background = Gdk.RGBA() { red = 168.0 / 255.0, green = 207.0 / 
255.0, blue = 214.0 / 255.0, alpha = 1.0 };
+                       added_attributes.background = Gdk.RGBA() { red = 220.0 / 255.0, green = 1.0, blue = 
220.0 / 255.0, alpha = 1.0 };
+                       removed_attributes.background = Gdk.RGBA() { red = 1.0, green = 220.0 / 255.0, blue = 
220.0 / 255.0, alpha = 1.0 };
+               }
+
+               d_sourceview_hunk.set_mark_attributes(d_selection_category, selection_attributes, 0);
+               d_sourceview_hunk.set_mark_attributes("added", added_attributes, 0);
+               d_sourceview_hunk.set_mark_attributes("removed", removed_attributes, 0);
        }
 
        private bool get_line_selected(Gtk.TextIter iter)
@@ -432,15 +457,6 @@ class Gitg.DiffViewHunk : Gtk.Grid
 
                buffer.set_text((string)content.data);
 
-               var added_attributes = new Gtk.SourceMarkAttributes();
-               added_attributes.background = Gdk.RGBA() { red = 220.0 / 255.0, green = 1.0, blue = 220.0 / 
255.0, alpha = 1.0 };
-
-               var removed_attributes = new Gtk.SourceMarkAttributes();
-               removed_attributes.background = Gdk.RGBA() { red = 1.0, green = 220.0 / 255.0, blue = 220.0 / 
255.0, alpha = 1.0 };
-
-               d_sourceview_hunk.set_mark_attributes("added", added_attributes, 0);
-               d_sourceview_hunk.set_mark_attributes("removed", removed_attributes, 0);
-
                for (var i = 0; i < lines.size; i++)
                {
                        var line = lines[i];