From 755316ab027daa81e873da1191933e5e6fb7b9b4 Mon Sep 17 00:00:00 2001
From: Simon Steinbeiss <simon.steinbeiss@elfenbeinturm.at>
Date: Tue, 30 May 2017 00:00:30 +0200
Subject: [PATCH] Make arrowbuttons blink with a CSS animation (Bug #13599)

---
 libxfce4panel/xfce-arrow-button.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/libxfce4panel/xfce-arrow-button.c b/libxfce4panel/xfce-arrow-button.c
index 7d17a575..e728a5a7 100644
--- a/libxfce4panel/xfce-arrow-button.c
+++ b/libxfce4panel/xfce-arrow-button.c
@@ -107,8 +107,10 @@ struct _XfceArrowButtonPrivate
    * MAX_BLINKING_COUNT is reached */
   guint          blinking_counter;
 
+#if !GTK_CHECK_VERSION (3, 0, 0)
   /* button relief when the blinking starts */
   GtkReliefStyle last_relief;
+#endif
 };
 
 
@@ -195,7 +197,9 @@ xfce_arrow_button_init (XfceArrowButton *button)
   button->priv->arrow_type = GTK_ARROW_UP;
   button->priv->blinking_timeout_id = 0;
   button->priv->blinking_counter = 0;
+#if !GTK_CHECK_VERSION (3, 0, 0)
   button->priv->last_relief = GTK_RELIEF_NORMAL;
+#endif
 
   /* set some widget properties */
   gtk_widget_set_has_window (GTK_WIDGET (button), FALSE);
@@ -207,7 +211,7 @@ xfce_arrow_button_init (XfceArrowButton *button)
      launcher buttons to overlap when panels have a fairly normal size */
   context = gtk_widget_get_style_context (GTK_WIDGET (button));
   provider = gtk_css_provider_new ();
-  gtk_css_provider_load_from_data (provider, ".xfce4-panel button { padding: 0; }", -1, NULL);
+  gtk_css_provider_load_from_data (provider, "@keyframes blink { from { opacity: 1.0; } 50% { opacity: 0.4; } to { opacity: 0.8; } } .xfce4-panel button { padding: 0; } .xfce4-panel button.blinking { animation-name: blink; animation: blink 2s linear infinite; }", -1, NULL);
   gtk_style_context_add_provider (context,
                                   GTK_STYLE_PROVIDER (provider),
                                   GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
@@ -590,6 +594,13 @@ static gboolean
 xfce_arrow_button_blinking_timeout (gpointer user_data)
 {
   XfceArrowButton *button = XFCE_ARROW_BUTTON (user_data);
+
+#if GTK_CHECK_VERSION (3, 0, 0)
+  GtkStyleContext        *context;
+
+  context = gtk_widget_get_style_context (GTK_WIDGET (button));
+  gtk_style_context_add_class (context, "blinking");
+#else
   GtkStyle        *style;
   GtkRcStyle      *rc;
 
@@ -609,6 +620,7 @@ xfce_arrow_button_blinking_timeout (gpointer user_data)
       rc->bg[GTK_STATE_NORMAL] = style->bg[GTK_STATE_SELECTED];
       gtk_widget_modify_style(GTK_WIDGET (button), rc);
     }
+#endif
 
   return (button->priv->blinking_counter++ < MAX_BLINKING_COUNT);
 }
@@ -619,12 +631,20 @@ static void
 xfce_arrow_button_blinking_timeout_destroyed (gpointer user_data)
 {
   XfceArrowButton *button = XFCE_ARROW_BUTTON (user_data);
+
+#if GTK_CHECK_VERSION (3, 0, 0)
+  GtkStyleContext        *context;
+
+  context = gtk_widget_get_style_context (GTK_WIDGET (button));
+  gtk_style_context_remove_class (context, "blinking");
+#else
   GtkRcStyle      *rc;
 
   rc = gtk_widget_get_modifier_style (GTK_WIDGET (button));
   gtk_button_set_relief (GTK_BUTTON (button), button->priv->last_relief);
   PANEL_UNSET_FLAG (rc->color_flags[GTK_STATE_NORMAL], GTK_RC_BG);
   gtk_widget_modify_style (GTK_WIDGET (button), rc);
+#endif
 
   button->priv->blinking_timeout_id = 0;
   button->priv->blinking_counter = 0;
@@ -738,8 +758,10 @@ xfce_arrow_button_set_blinking (XfceArrowButton *button,
 
   if (blinking)
     {
+#if !GTK_CHECK_VERSION (3, 0, 0)
       /* store the relief of the button */
       button->priv->last_relief = gtk_button_get_relief (GTK_BUTTON (button));
+#endif
 
       if (button->priv->blinking_timeout_id == 0)
         {
-- 
2.11.0