[gnome-flashback/wip/segeiger/gnome-3-18-inputmethods: 6/7] input-sources: add styles for hover states

[Sebastian Geiger <segeiger src gnome org>]

commit 9a075e8b1acf3c9b27f041b8b7111d78c1ee05a2
Author: Sebastian Geiger <sbastig gmx net>
Date:   Sun Jan 17 10:36:10 2016 +0100

    input-sources: add styles for hover states

 gnome-flashback/Adwaita.css                        |    5 +++
 .../libinput-sources/gf-candidate-area.c           |   30 ++++++++++++++++++++
 2 files changed, 35 insertions(+), 0 deletions(-)
---
diff --git a/gnome-flashback/Adwaita.css b/gnome-flashback/Adwaita.css
index 253b543..29dda4e 100644
--- a/gnome-flashback/Adwaita.css
+++ b/gnome-flashback/Adwaita.css
@@ -22,3 +22,8 @@ FlashbackLabelWindow
 GfCandidateBox.selected {
     background: #7b7b7b;
 }
+
+GfCandidateBox.hover {
+    background: #ccc;
+    border: 1px solid #aaa;
+}
diff --git a/gnome-flashback/libinput-sources/gf-candidate-area.c 
b/gnome-flashback/libinput-sources/gf-candidate-area.c
index a5bdb9b..392d65e 100644
--- a/gnome-flashback/libinput-sources/gf-candidate-area.c
+++ b/gnome-flashback/libinput-sources/gf-candidate-area.c
@@ -87,6 +87,32 @@ next_button_clicked_cb (GtkButton       *button,
   return GDK_EVENT_PROPAGATE;
 }
 
+static gboolean
+box_mouse_enter_cb (GtkWidget *widget,
+                    GdkEvent  *event,
+                    gpointer   user_data)
+{
+  GtkStyleContext *context;
+
+  context = gtk_widget_get_style_context (widget);
+  gtk_style_context_add_class (context, "hover");
+
+  return GDK_EVENT_PROPAGATE;
+}
+
+static gboolean
+box_mouse_leave_cb (GtkWidget *widget,
+                    GdkEvent  *event,
+                    gpointer   user_data)
+{
+  GtkStyleContext *context;
+
+  context = gtk_widget_get_style_context (widget);
+  gtk_style_context_remove_class (context, "hover");
+
+  return GDK_EVENT_PROPAGATE;
+}
+
 void
 gf_candidate_area_set_orientation (GfCandidateArea *area,
                                    IBusOrientation  orientation)
@@ -258,6 +284,10 @@ gf_candidate_area_init (GfCandidateArea *area)
 
       g_signal_connect (candidate_box, "button-release-event",
                         G_CALLBACK (button_clicked_cb), area);
+      g_signal_connect (candidate_box, "enter-notify-event",
+                        G_CALLBACK (box_mouse_enter_cb), area);
+      g_signal_connect (candidate_box, "leave-notify-event",
+                        G_CALLBACK (box_mouse_leave_cb), area);
     }
 
   area->button_box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);