[epiphany/wip/exalm/urlbar: 2/5] ephy-location-entry: Add hover state

[Alexander Mikhaylenko <alexm src gnome org>]

commit e8b1a661127c041b1218877d83df4d536ce42e31
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Tue Jan 29 10:42:09 2019 +0500

    ephy-location-entry: Add hover state
    
    GTK+ 3.x cannot have hover state for entries, so listen to enter/leave
    events and set widget state manually.

 lib/widgets/ephy-location-entry.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
---
diff --git a/lib/widgets/ephy-location-entry.c b/lib/widgets/ephy-location-entry.c
index dc33e3d69..c7b06afd2 100644
--- a/lib/widgets/ephy-location-entry.c
+++ b/lib/widgets/ephy-location-entry.c
@@ -772,6 +772,22 @@ suggestion_selected (DzlSuggestionEntry *entry,
   schedule_dns_prefetch (lentry, uri);
 }
 
+static void
+enter_notify_cb (GtkWidget *widget,
+                 GdkEvent  *event,
+                 gpointer   user_data)
+{
+  gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_PRELIGHT, FALSE);
+}
+
+static void
+leave_notify_cb (GtkWidget *widget,
+                 GdkEvent  *event,
+                 gpointer   user_data)
+{
+  gtk_widget_unset_state_flags (widget, GTK_STATE_FLAG_PRELIGHT);
+}
+
 static void
 ephy_location_entry_construct_contents (EphyLocationEntry *entry)
 {
@@ -797,6 +813,11 @@ ephy_location_entry_construct_contents (EphyLocationEntry *entry)
   gtk_widget_show (GTK_WIDGET (entry->url_entry));
   gtk_overlay_add_overlay (GTK_OVERLAY (entry), GTK_WIDGET (entry->url_entry));
 
+  /* Custom hover state. FIXME: Remove this for GTK4 */
+  gtk_widget_add_events (GTK_WIDGET (entry->url_entry), GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK);
+  g_signal_connect (G_OBJECT (entry->url_entry), "enter-notify-event", G_CALLBACK (enter_notify_cb), entry);
+  g_signal_connect (G_OBJECT (entry->url_entry), "leave-notify-event", G_CALLBACK (leave_notify_cb), entry);
+
   /* Event box */
   event = gtk_event_box_new ();
   gtk_widget_set_halign (event, GTK_ALIGN_END);