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[libhandy/wip/exalm/paginator-animate: 75/78] carousel-box: Animate child addition and deletion

commit 9f71d6e8cae12ea575aa7fd7738c46cf5ffac16c
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Sun Dec 29 17:08:07 2019 +0500

    carousel-box: Animate child addition and deletion
    
    When adding a child, set its size to 0 and animate to 1. Do the opposite
    when removing.
    
    The children that are being removed don't contain widgets anymore, so add
    checks in every place that accesses their widgets. Change get_n_pages()
    and get_nth_child() to ignore the removing children.
    
    Since snap points move during the animations, keep the destination child
    during position animations and adjust the end value as it changes.
    
    Signed-off-by: Alexander Mikhaylenko <alexm gnome org>

 src/hdy-carousel-box.c | 411 ++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 340 insertions(+), 71 deletions(-)
---
diff --git a/src/hdy-carousel-box.c b/src/hdy-carousel-box.c
index 9111e713..225fd7ef 100644
--- a/src/hdy-carousel-box.c
+++ b/src/hdy-carousel-box.c
@@ -46,6 +46,11 @@ struct _HdyCarouselBoxChildInfo
   gboolean visible;
   gdouble size;
   gdouble snap_point;
+  gboolean adding;
+  gboolean removing;
+
+  gboolean shift_position;
+  HdyCarouselBoxAnimation resize_animation;
 
   cairo_surface_t *surface;
   cairo_region_t *dirty_region;
@@ -56,6 +61,7 @@ struct _HdyCarouselBox
   GtkContainer parent_instance;
 
   HdyCarouselBoxAnimation animation;
+  HdyCarouselBoxChildInfo *destination_child;
   GList *children;
 
   gint child_width;
@@ -112,7 +118,8 @@ find_child_info (HdyCarouselBox *self,
 
 static gint
 find_child_index (HdyCarouselBox *self,
-                  GtkWidget      *widget)
+                  GtkWidget      *widget,
+                  gboolean        count_removing)
 {
   GList *l;
   gint i;
@@ -121,6 +128,9 @@ find_child_index (HdyCarouselBox *self,
   for (l = self->children; l; l = l->next) {
     HdyCarouselBoxChildInfo *info = l->data;
 
+    if (info->removing && !count_removing)
+      continue;
+
     if (widget == info->widget)
       return i;
 
@@ -130,6 +140,28 @@ find_child_index (HdyCarouselBox *self,
   return -1;
 }
 
+static GList *
+get_nth_link (HdyCarouselBox *self,
+              gint            n)
+{
+
+  GList *l;
+  gint i;
+
+  i = n;
+  for (l = self->children; l; l = l->next) {
+    HdyCarouselBoxChildInfo *info = l->data;
+
+    if (info->removing)
+      continue;
+
+    if (i-- == 0)
+      return l;
+  }
+
+  return NULL;
+}
+
 static HdyCarouselBoxChildInfo *
 find_child_info_by_window (HdyCarouselBox *self,
                            GdkWindow      *window)
@@ -148,7 +180,9 @@ find_child_info_by_window (HdyCarouselBox *self,
 
 static HdyCarouselBoxChildInfo *
 get_closest_child_at (HdyCarouselBox *self,
-                      gdouble         position)
+                      gdouble         position,
+                      gboolean        count_adding,
+                      gboolean        count_removing)
 {
   GList *l;
   HdyCarouselBoxChildInfo *closest_child = NULL;
@@ -156,6 +190,12 @@ get_closest_child_at (HdyCarouselBox *self,
   for (l = self->children; l; l = l->next) {
     HdyCarouselBoxChildInfo *child = l->data;
 
+    if (child->adding && !count_adding)
+      continue;
+
+    if (child->removing && !count_removing)
+      continue;
+
     if (!closest_child ||
         ABS (closest_child->snap_point - position) >
         ABS (child->snap_point - position))
@@ -205,6 +245,9 @@ register_window (HdyCarouselBoxChildInfo *info,
   GtkAllocation allocation;
   gint attributes_mask;
 
+  if (info->removing)
+    return;
+
   widget = GTK_WIDGET (self);
   gtk_widget_get_allocation (info->widget, &allocation);
 
@@ -236,47 +279,248 @@ static void
 unregister_window (HdyCarouselBoxChildInfo *info,
                    HdyCarouselBox          *self)
 {
+  if (!info->widget)
+    return;
+
   gtk_widget_set_parent_window (info->widget, NULL);
   gtk_widget_unregister_window (GTK_WIDGET (self), info->window);
   gdk_window_destroy (info->window);
   info->window = NULL;
 }
 
-static gboolean
-animation_cb (GtkWidget     *widget,
-              GdkFrameClock *frame_clock,
-              gpointer       user_data)
+static gdouble
+get_animation_value (HdyCarouselBoxAnimation *animation,
+                     GdkFrameClock           *frame_clock)
 {
-  HdyCarouselBox *self = HDY_CAROUSEL_BOX (widget);
   gint64 frame_time, duration;
-  gdouble position;
   gdouble t;
 
-  if (!hdy_carousel_box_is_animating (self)) {
-    self->tick_cb_id = 0;
+  frame_time = gdk_frame_clock_get_frame_time (frame_clock) / 1000;
+  frame_time = MIN (frame_time, animation->end_time);
+
+  duration = animation->end_time - animation->start_time;
+  t = (gdouble) (frame_time - animation->start_time) / duration;
+  t = hdy_ease_out_cubic (t);
+
+  return hdy_lerp (animation->start_value, animation->end_value, 1 - t);
+}
+
+static gboolean
+animate_position (HdyCarouselBox *self,
+                  GdkFrameClock  *frame_clock)
+{
+  gint64 frame_time;
+  gdouble value;
+
+  if (!hdy_carousel_box_is_animating (self))
     return G_SOURCE_REMOVE;
-  }
 
   frame_time = gdk_frame_clock_get_frame_time (frame_clock) / 1000;
-  frame_time = MIN (frame_time, self->animation.end_time);
-
-  duration = self->animation.end_time - self->animation.start_time;
-  position = (gdouble) (frame_time - self->animation.start_time) / duration;
 
-  t = hdy_ease_out_cubic (position);
-  hdy_carousel_box_set_position (self,
-                                 hdy_lerp (self->animation.start_value,
-                                           self->animation.end_value, 1 - t));
+  self->animation.end_value = self->destination_child->snap_point;
+  value = get_animation_value (&self->animation, frame_clock);
+  hdy_carousel_box_set_position (self, value);
 
-  if (frame_time == self->animation.end_time) {
+  if (frame_time >= self->animation.end_time) {
     self->animation.start_time = 0;
     self->animation.end_time = 0;
     g_signal_emit (self, signals[SIGNAL_ANIMATION_STOPPED], 0);
+    return G_SOURCE_REMOVE;
+  }
+
+  return G_SOURCE_CONTINUE;
+}
+
+static void update_windows (HdyCarouselBox *self);
+
+static void
+complete_child_animation (HdyCarouselBox          *self,
+                          HdyCarouselBoxChildInfo *child)
+{
+  update_windows (self);
+
+  if (child->adding)
+    child->adding = FALSE;
+
+  if (child->removing) {
+    self->children = g_list_remove (self->children, child);
+
+    free_child_info (child);
+  }
+}
+
+static gboolean
+animate_child_size (HdyCarouselBox          *self,
+                    HdyCarouselBoxChildInfo *child,
+                    GdkFrameClock           *frame_clock,
+                    gdouble                 *delta)
+{
+  gint64 frame_time;
+  gdouble d, new_value;
+
+  if (child->resize_animation.start_time == 0)
+    return G_SOURCE_REMOVE;
+
+  new_value = get_animation_value (&child->resize_animation, frame_clock);
+  d = new_value - child->size;
+
+  child->size += d;
+
+  frame_time = gdk_frame_clock_get_frame_time (frame_clock) / 1000;
+
+  if (delta)
+    *delta = d;
+
+  if (frame_time >= child->resize_animation.end_time) {
+    child->resize_animation.start_time = 0;
+    child->resize_animation.end_time = 0;
+    complete_child_animation (self, child);
+    return G_SOURCE_REMOVE;
   }
 
   return G_SOURCE_CONTINUE;
 }
 
+static void
+set_position (HdyCarouselBox *self,
+              gdouble         position)
+{
+  gdouble lower, upper;
+
+  hdy_carousel_box_get_range (self, &lower, &upper);
+
+  position = CLAMP (position, lower, upper);
+
+  self->position = position;
+  update_windows (self);
+  g_object_notify_by_pspec (G_OBJECT (self), props[PROP_POSITION]);
+}
+
+static gboolean
+animation_cb (GtkWidget     *widget,
+              GdkFrameClock *frame_clock,
+              gpointer       user_data)
+{
+  HdyCarouselBox *self = HDY_CAROUSEL_BOX (widget);
+  g_autoptr (GList) children = NULL;
+  GList *l;
+  gboolean should_continue;
+  gdouble position_shift;
+
+  should_continue = G_SOURCE_REMOVE;
+
+  position_shift = 0;
+
+  children = g_list_copy (self->children);
+  for (l = children; l; l = l->next) {
+    HdyCarouselBoxChildInfo *child = l->data;
+    gdouble delta;
+    gboolean shift;
+
+    delta = 0;
+    shift = child->shift_position;
+
+    should_continue |= animate_child_size (self, child, frame_clock, &delta);
+
+    if (shift)
+      position_shift += delta;
+  }
+
+  update_windows (self);
+
+  if (position_shift != 0) {
+    set_position (self, self->position + position_shift);
+    g_signal_emit (self, signals[SIGNAL_POSITION_SHIFTED], 0, position_shift);
+  }
+
+  should_continue |= animate_position (self, frame_clock);
+
+  update_windows (self);
+
+  if (!should_continue)
+    self->tick_cb_id = 0;
+
+  return should_continue;
+}
+
+static void
+update_shift_position_flag (HdyCarouselBox          *self,
+                            HdyCarouselBoxChildInfo *child)
+{
+  HdyCarouselBoxChildInfo *closest_child;
+  gint animating_index, closest_index;
+
+  /* We want to still shift position when the active child is being removed */
+  closest_child = get_closest_child_at (self, self->position, FALSE, TRUE);
+
+  if (!closest_child)
+    return;
+
+  animating_index = g_list_index (self->children, child);
+  closest_index = g_list_index (self->children, closest_child);
+
+  child->shift_position = (closest_index >= animating_index);
+}
+
+static void
+animate_child (HdyCarouselBox          *self,
+               HdyCarouselBoxChildInfo *child,
+               gdouble                  value,
+               gint64                   duration)
+{
+  GdkFrameClock *frame_clock;
+  gint64 frame_time;
+
+  if (child->resize_animation.start_time > 0) {
+    child->resize_animation.start_time = 0;
+    child->resize_animation.end_time = 0;
+  }
+
+  update_shift_position_flag (self, child);
+
+  if (!gtk_widget_get_realized (GTK_WIDGET (self)) ||
+      duration <= 0 ||
+      !hdy_get_enable_animations (GTK_WIDGET (self))) {
+    gdouble delta = value - child->size;
+
+    child->size = value;
+
+    if (child->shift_position) {
+      set_position (self, self->position + delta);
+      g_signal_emit (self, signals[SIGNAL_POSITION_SHIFTED], 0, delta);
+    }
+
+    complete_child_animation (self, child);
+    return;
+  }
+
+  frame_clock = gtk_widget_get_frame_clock (GTK_WIDGET (self));
+  if (!frame_clock) {
+    gdouble delta = value - child->size;
+
+    child->size = value;
+
+    if (child->shift_position) {
+      set_position (self, self->position + delta);
+      g_signal_emit (self, signals[SIGNAL_POSITION_SHIFTED], 0, delta);
+    }
+
+    complete_child_animation (self, child);
+    return;
+  }
+
+  frame_time = gdk_frame_clock_get_frame_time (frame_clock);
+
+  child->resize_animation.start_value = child->size;
+  child->resize_animation.end_value = value;
+
+  child->resize_animation.start_time = frame_time / 1000;
+  child->resize_animation.end_time = child->resize_animation.start_time + duration;
+  if (self->tick_cb_id == 0)
+    self->tick_cb_id =
+      gtk_widget_add_tick_callback (GTK_WIDGET (self), animation_cb, self, NULL);
+}
+
 static gboolean
 hdy_carousel_box_draw (GtkWidget *widget,
                        cairo_t   *cr)
@@ -287,10 +531,13 @@ hdy_carousel_box_draw (GtkWidget *widget,
   for (l = self->children; l; l = l->next) {
     HdyCarouselBoxChildInfo *info = l->data;
 
+    if (info->adding || info->removing)
+      continue;
+
     if (!info->visible)
       continue;
 
-    if (info->dirty_region) {
+    if (info->dirty_region && !info->removing) {
       g_autoptr (cairo_t) surface_cr = NULL;
       GtkAllocation child_alloc;
 
@@ -369,6 +616,9 @@ measure (GtkWidget      *widget,
     GtkWidget *child = child_info->widget;
     gint child_min, child_nat;
 
+    if (child_info->removing)
+      continue;
+
     if (!gtk_widget_get_visible (child))
       continue;
 
@@ -465,7 +715,7 @@ update_windows (HdyCarouselBox *self)
 {
   GList *children;
   GtkAllocation alloc;
-  gint x, y, offset;
+  gdouble x, y, offset;
   gboolean is_rtl;
   gdouble snap_point;
 
@@ -504,24 +754,26 @@ update_windows (HdyCarouselBox *self)
   for (children = self->children; children; children = children->next) {
     HdyCarouselBoxChildInfo *child_info = children->data;
 
-    if (!gtk_widget_get_visible (child_info->widget))
-      continue;
+    if (!child_info->removing) {
+      if (!gtk_widget_get_visible (child_info->widget))
+        continue;
+
+      if (self->orientation == GTK_ORIENTATION_VERTICAL) {
+        child_info->position = y;
+        child_info->visible = child_info->position < alloc.height &&
+                              child_info->position + self->child_height > 0;
+        gdk_window_move (child_info->window, alloc.x, alloc.y + child_info->position);
+      } else {
+        child_info->position = x;
+        child_info->visible = child_info->position < alloc.width &&
+                              child_info->position + self->child_width > 0;
+        gdk_window_move (child_info->window, alloc.x + child_info->position, alloc.y);
+      }
 
-    if (self->orientation == GTK_ORIENTATION_VERTICAL) {
-      child_info->position = y;
-      child_info->visible = child_info->position < alloc.height &&
-                            child_info->position + self->child_height > 0;
-      gdk_window_move (child_info->window, alloc.x, alloc.y + child_info->position);
-    } else {
-      child_info->position = x;
-      child_info->visible = child_info->position < alloc.width &&
-                            child_info->position + self->child_width > 0;
-      gdk_window_move (child_info->window, alloc.x + child_info->position, alloc.y);
+      if (!child_info->visible)
+        invalidate_cache_for_child (self, child_info);
     }
 
-    if (!child_info->visible)
-      invalidate_cache_for_child (self, child_info);
-
     if (self->orientation == GTK_ORIENTATION_VERTICAL)
       y += self->distance * child_info->size;
     else if (is_rtl)
@@ -578,6 +830,9 @@ hdy_carousel_box_size_allocate (GtkWidget     *widget,
     gint min, nat;
     gint child_size;
 
+    if (child_info->removing)
+      continue;
+
     if (self->orientation == GTK_ORIENTATION_HORIZONTAL) {
       gtk_widget_get_preferred_width_for_height (child, allocation->height,
                                                  &min, &nat);
@@ -616,6 +871,9 @@ hdy_carousel_box_size_allocate (GtkWidget     *widget,
   for (children = self->children; children; children = children->next) {
     HdyCarouselBoxChildInfo *child_info = children->data;
 
+    if (child_info->removing)
+      continue;
+
     if (!gtk_widget_get_visible (child_info->widget))
       continue;
 
@@ -632,6 +890,9 @@ hdy_carousel_box_size_allocate (GtkWidget     *widget,
     GtkWidget *child = child_info->widget;
     GtkAllocation alloc;
 
+    if (child_info->removing)
+      continue;
+
     if (!gtk_widget_get_visible (child))
       continue;
 
@@ -668,27 +929,22 @@ hdy_carousel_box_remove (GtkContainer *container,
                          GtkWidget    *widget)
 {
   HdyCarouselBox *self = HDY_CAROUSEL_BOX (container);
-  gdouble closest_point;
   HdyCarouselBoxChildInfo *info;
 
   info = find_child_info (self, widget);
   if (!info)
     return;
 
-  closest_point = hdy_carousel_box_get_closest_snap_point (self);
+  info->removing = TRUE;
 
   gtk_widget_unparent (widget);
-  self->children = g_list_remove (self->children, info);
 
   if (gtk_widget_get_realized (GTK_WIDGET (container)))
     unregister_window (info, self);
 
-  if (closest_point >= info->snap_point)
-    shift_position (self, -info->size);
-  else
-    gtk_widget_queue_allocate (GTK_WIDGET (self));
+  info->widget = NULL;
 
-  free_child_info (info);
+  animate_child (self, info, 0, self->reveal_duration);
 
   g_object_notify_by_pspec (G_OBJECT (self), props[PROP_N_PAGES]);
 }
@@ -707,7 +963,8 @@ hdy_carousel_box_forall (GtkContainer *container,
   for (l = children; l; l = l->next) {
     HdyCarouselBoxChildInfo *child = l->data;
 
-    (* callback) (child->widget, callback_data);
+    if (!child->removing)
+       (* callback) (child->widget, callback_data);
   }
 }
 
@@ -972,7 +1229,6 @@ hdy_carousel_box_insert (HdyCarouselBox *self,
                          gint            position)
 {
   HdyCarouselBoxChildInfo *info;
-  gdouble orig_point, closest_point;
   GList *prev_link;
 
   g_return_if_fail (HDY_IS_CAROUSEL_BOX (self));
@@ -980,30 +1236,25 @@ hdy_carousel_box_insert (HdyCarouselBox *self,
 
   info = g_new0 (HdyCarouselBoxChildInfo, 1);
   info->widget = widget;
-  info->size = 1;
+  info->size = 0;
+  info->adding = TRUE;
 
   if (gtk_widget_get_realized (GTK_WIDGET (self)))
     register_window (info, self);
 
-  closest_point = hdy_carousel_box_get_closest_snap_point (self);
-
   if (position >= 0)
-    prev_link = g_list_nth (self->children, position);
+    prev_link = get_nth_link (self, position);
   else
     prev_link = NULL;
 
-  if (prev_link)
-    orig_point = ((HdyCarouselBoxChildInfo *) prev_link->data)->snap_point;
-  else
-    orig_point = -1;
-
   self->children = g_list_insert_before (self->children, prev_link, info);
 
-  if (closest_point >= orig_point && orig_point >= 0)
-    shift_position (self, info->size);
-
   gtk_widget_set_parent (widget, GTK_WIDGET (self));
 
+  update_windows (self);
+
+  animate_child (self, info, 1, self->reveal_duration);
+
   invalidate_drawing_cache (self);
 
   g_object_notify_by_pspec (G_OBJECT (self), props[PROP_N_PAGES]);
@@ -1049,7 +1300,7 @@ hdy_carousel_box_reorder (HdyCarouselBox *self,
   if (position < 0 || position >= hdy_carousel_box_get_n_pages (self))
     prev_link = g_list_last (self->children);
   else
-    prev_link = g_list_nth (self->children, position);
+    prev_link = get_nth_link (self, position);
 
   prev_info = prev_link->data;
   new_point = prev_info->snap_point;
@@ -1157,6 +1408,8 @@ hdy_carousel_box_scroll_to (HdyCarouselBox *self,
 
   frame_time = gdk_frame_clock_get_frame_time (frame_clock);
 
+  self->destination_child = child;
+
   self->animation.start_value = self->position;
   self->animation.end_value = position;
 
@@ -1180,9 +1433,20 @@ hdy_carousel_box_scroll_to (HdyCarouselBox *self,
 guint
 hdy_carousel_box_get_n_pages (HdyCarouselBox *self)
 {
+  GList *l;
+  guint n_pages;
+
   g_return_val_if_fail (HDY_IS_CAROUSEL_BOX (self), 0);
 
-  return g_list_length (self->children);
+  n_pages = 0;
+  for (l = self->children; l; l = l->next) {
+    HdyCarouselBoxChildInfo *child = l->data;
+
+    if (!child->removing)
+      n_pages++;
+  }
+
+  return n_pages;
 }
 
 /**
@@ -1234,13 +1498,18 @@ void
 hdy_carousel_box_set_position (HdyCarouselBox *self,
                                gdouble         position)
 {
+  GList *l;
+
   g_return_if_fail (HDY_IS_CAROUSEL_BOX (self));
 
-  position = CLAMP (position, 0, hdy_carousel_box_get_n_pages (self) - 1);
+  set_position (self, position);
 
-  self->position = position;
-  update_windows (self);
-  g_object_notify_by_pspec (G_OBJECT (self), props[PROP_POSITION]);
+  for (l = self->children; l; l = l->next) {
+    HdyCarouselBoxChildInfo *child = l->data;
+
+    if (child->adding || child->removing)
+      update_shift_position_flag (self, child);
+  }
 }
 
 /**
@@ -1345,9 +1614,9 @@ hdy_carousel_box_get_nth_child (HdyCarouselBox *self,
   HdyCarouselBoxChildInfo *info;
 
   g_return_val_if_fail (HDY_IS_CAROUSEL_BOX (self), NULL);
-  g_return_val_if_fail (n < g_list_length (self->children), NULL);
+  g_return_val_if_fail (n < hdy_carousel_box_get_n_pages (self), NULL);
 
-  info = g_list_nth_data (self->children, n);
+  info = get_nth_link (self, n)->data;
 
   return info->widget;
 }
@@ -1374,7 +1643,7 @@ hdy_carousel_box_get_snap_points (HdyCarouselBox *self,
 
   g_return_val_if_fail (HDY_IS_CAROUSEL_BOX (self), NULL);
 
-  n_pages = MAX (hdy_carousel_box_get_n_pages (self), 1);
+  n_pages = MAX (g_list_length (self->children), 1);
 
   points = g_new0 (gdouble, n_pages);
 
@@ -1436,7 +1705,7 @@ hdy_carousel_box_get_closest_snap_point (HdyCarouselBox *self)
 {
   HdyCarouselBoxChildInfo *closest_child;
 
-  closest_child = get_closest_child_at (self, self->position);
+  closest_child = get_closest_child_at (self, self->position, TRUE, TRUE);
 
   if (!closest_child)
     return 0;
@@ -1470,7 +1739,7 @@ hdy_carousel_box_get_page_at_position (HdyCarouselBox *self,
 
   position = CLAMP (position, lower, upper);
 
-  child = get_closest_child_at (self, position);
+  child = get_closest_child_at (self, position, TRUE, FALSE);
 
   return child->widget;
 }
@@ -1494,5 +1763,5 @@ hdy_carousel_box_get_current_page_index (HdyCarouselBox *self)
 
   child = hdy_carousel_box_get_page_at_position (self, self->position);
 
-  return find_child_index (self, child);
+  return find_child_index (self, child, FALSE);
 }
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