[gnome-tweak-tool] Move CSS to external file

[John Stowers <jstowers src gnome org>]

commit 60d2c3b5079fde71c7c502832136e1ada6c67236
Author: John Stowers <john stowers gmail com>
Date:   Sun Aug 4 13:22:27 2013 +0200

    Move CSS to external file
    
    * set a list row background color
    * set a minimum width for the sidebar

 data/shell.css      |    6 ++++++
 gtweak/tweakview.py |   17 ++++++++---------
 2 files changed, 14 insertions(+), 9 deletions(-)
---
diff --git a/data/shell.css b/data/shell.css
new file mode 100644
index 0000000..8039233
--- /dev/null
+++ b/data/shell.css
@@ -0,0 +1,6 @@
+.list#tweak-categories {
+    background: #ebedeb;
+}
+.list-row#tweak-category {
+    padding: 10px;
+}
diff --git a/gtweak/tweakview.py b/gtweak/tweakview.py
index 30f8a84..134ef2e 100644
--- a/gtweak/tweakview.py
+++ b/gtweak/tweakview.py
@@ -15,6 +15,7 @@
 # You should have received a copy of the GNU General Public License
 # along with gnome-tweak-tool.  If not, see <http://www.gnu.org/licenses/>.
 
+import os.path
 import logging
 import datetime
 
@@ -89,10 +90,13 @@ class Window(Gtk.ApplicationWindow):
         self.entry.connect("search-changed", self._on_search)
         self.revealer.add(self.entry)
         
-        self.listbox = Gtk.ListBox()
+        self.listbox = Gtk.ListBox(name="tweak-categories")
+        self.listbox.set_size_request(200,-1)
         self.listbox.connect("row-selected", self._on_select_row)
         self.listbox.set_header_func(self._list_header_func, None)
         scroll = Gtk.ScrolledWindow()
+        scroll.set_policy(Gtk.PolicyType.NEVER,
+                          Gtk.PolicyType.AUTOMATIC)
         scroll.add(self.listbox)
         
         left_header.pack_start(self.button)
@@ -116,14 +120,9 @@ class Window(Gtk.ApplicationWindow):
         return right_box
 
     def load_css(self):
-        css = """
-        #row
-        {
-           padding: 10px;
-        }
-        """
         css_provider = Gtk.CssProvider()
-        css_provider.load_from_data(css)
+        css_provider.load_from_path(
+                        os.path.join(gtweak.PKG_DATA_DIR, 'shell.css'))
         screen = Gdk.Screen.get_default()
         context = Gtk.StyleContext()
         context.add_provider_for_screen(screen, css_provider,
@@ -134,7 +133,7 @@ class Window(Gtk.ApplicationWindow):
         def _items_listbox(text):
             lbl = Gtk.Label(text, xalign=0.0)
             lbl.set_name('row')
-            row = Gtk.ListBoxRow()
+            row = Gtk.ListBoxRow(name="tweak-category")
             row.add(lbl)
             return row