animation: Add _gtk_style_animation_is_static()

This will be useful to not trigger updates all the time when nothing is
happening (ie due to animations being paused or due to them having
reached their final value).

4 files changed, 58 insertions, 0 deletions

diff --git a/gtk/gtkcssanimation.c b/gtk/gtkcssanimation.c
index 765bb4e750..c0964de2ba 100644
--- a/gtk/gtkcssanimation.c
+++ b/gtk/gtkcssanimation.c
@@ -143,6 +143,18 @@ gtk_css_animation_is_finished (GtkStyleAnimation *style_animation,
   return FALSE;
 }
 
+static gboolean
+gtk_css_animation_is_static (GtkStyleAnimation *style_animation,
+                             gint64             at_time_us)
+{
+  GtkCssAnimation *animation = GTK_CSS_ANIMATION (style_animation);
+  double iteration;
+
+  iteration = gtk_css_animation_get_iteration (animation, at_time_us);
+
+  return iteration >= animation->iteration_count;
+}
+
 static void
 gtk_css_animation_finalize (GObject *object)
 {
@@ -165,6 +177,7 @@ _gtk_css_animation_class_init (GtkCssAnimationClass *klass)
 
   animation_class->set_values = gtk_css_animation_set_values;
   animation_class->is_finished = gtk_css_animation_is_finished;
+  animation_class->is_static = gtk_css_animation_is_static;
 }
 
 static void
diff --git a/gtk/gtkcsstransition.c b/gtk/gtkcsstransition.c
index ede18b32b7..d1287f2de6 100644
--- a/gtk/gtkcsstransition.c
+++ b/gtk/gtkcsstransition.c
@@ -68,6 +68,15 @@ gtk_css_transition_is_finished (GtkStyleAnimation *animation,
   return at_time_us >= transition->end_time;
 }
 
+static gboolean
+gtk_css_transition_is_static (GtkStyleAnimation *animation,
+                              gint64             at_time_us)
+{
+  GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
+
+  return at_time_us >= transition->end_time;
+}
+
 static void
 gtk_css_transition_finalize (GObject *object)
 {
@@ -90,6 +99,7 @@ _gtk_css_transition_class_init (GtkCssTransitionClass *klass)
 
   animation_class->set_values = gtk_css_transition_set_values;
   animation_class->is_finished = gtk_css_transition_is_finished;
+  animation_class->is_static = gtk_css_transition_is_static;
 }
 
 static void
diff --git a/gtk/gtkstyleanimation.c b/gtk/gtkstyleanimation.c
index aab78bddd7..ac74851c59 100644
--- a/gtk/gtkstyleanimation.c
+++ b/gtk/gtkstyleanimation.c
@@ -39,11 +39,19 @@ gtk_style_animation_real_is_finished (GtkStyleAnimation *animation,
   return TRUE;
 }
 
+static gboolean
+gtk_style_animation_real_is_static (GtkStyleAnimation *animation,
+                                    gint64             at_time_us)
+{
+  return FALSE;
+}
+
 static void
 _gtk_style_animation_class_init (GtkStyleAnimationClass *klass)
 {
   klass->set_values = gtk_style_animation_real_set_values;
   klass->is_finished = gtk_style_animation_real_is_finished;
+  klass->is_static = gtk_style_animation_real_is_static;
 }
 
 static void
@@ -80,3 +88,26 @@ _gtk_style_animation_is_finished (GtkStyleAnimation *animation,
   return klass->is_finished (animation, at_time_us);
 }
 
+/**
+ * _gtk_style_animation_is_static:
+ * @animation: The animation to query
+ * @at_time_us: The timestamp to query for
+ *
+ * Checks if @animation will not change its values anymore after
+ * @at_time_us. This happens for example when the animation has reached its
+ * final value or when it has been paused.
+ *
+ * Returns: %TRUE if @animation will not change anymore after @at_time_us
+ **/
+gboolean
+_gtk_style_animation_is_static (GtkStyleAnimation *animation,
+                                gint64             at_time_us)
+{
+  GtkStyleAnimationClass *klass;
+
+  g_return_val_if_fail (GTK_IS_STYLE_ANIMATION (animation), TRUE);
+
+  klass = GTK_STYLE_ANIMATION_GET_CLASS (animation);
+
+  return klass->is_static (animation, at_time_us);
+}
diff --git a/gtk/gtkstyleanimationprivate.h b/gtk/gtkstyleanimationprivate.h
index 5d5d6c602e..b4f2c69595 100644
--- a/gtk/gtkstyleanimationprivate.h
+++ b/gtk/gtkstyleanimationprivate.h
@@ -46,6 +46,8 @@ struct _GtkStyleAnimationClass
 
   gboolean      (* is_finished)                         (GtkStyleAnimation      *animation,
                                                          gint64                  at_time_us);
+  gboolean      (* is_static)                           (GtkStyleAnimation      *animation,
+                                                         gint64                  at_time_us);
   GtkBitmask *  (* set_values)                          (GtkStyleAnimation      *animation,
                                                          GtkBitmask             *changed,
                                                          gint64                  for_time_us,
@@ -60,6 +62,8 @@ GtkBitmask *    _gtk_style_animation_set_values         (GtkStyleAnimation
                                                          GtkCssComputedValues   *values) G_GNUC_WARN_UNUSED_RESULT;
 gboolean        _gtk_style_animation_is_finished        (GtkStyleAnimation      *animation,
                                                          gint64                  at_time_us);
+gboolean        _gtk_style_animation_is_static          (GtkStyleAnimation      *animation,
+                                                         gint64                  at_time_us);
 
 
 G_END_DECLS