[gtk: 3/9] gdk/events: Set discrete scroll deltas in its constructor

[Matthias Clasen <matthiasc src gnome org>]

commit 6ebb38e12e1d096c02e6eee3148552904ff87d81
Author: José Expósito <jose exposito89 gmail com>
Date:   Mon Sep 20 19:59:45 2021 +0200

    gdk/events: Set discrete scroll deltas in its constructor
    
    Instead of calculating the discrete scroll deltas in
    GtkEventControllerScroll, move that code to the event constructor and
    access the precalculated values using gdk_scroll_event_get_deltas.
    
    Refactor, no functional changes.

 gdk/gdkevents.c                | 23 +++++++++++++++++++++++
 gtk/gtkeventcontrollerscroll.c | 20 +-------------------
 2 files changed, 24 insertions(+), 19 deletions(-)
---
diff --git a/gdk/gdkevents.c b/gdk/gdkevents.c
index 0e78d337d2..4b61715575 100644
--- a/gdk/gdkevents.c
+++ b/gdk/gdkevents.c
@@ -2368,10 +2368,33 @@ gdk_scroll_event_new_discrete (GdkSurface         *surface,
                                GdkScrollDirection  direction)
 {
   GdkScrollEvent *self = gdk_event_alloc (GDK_SCROLL, surface, device, time);
+  double delta_x = 0, delta_y = 0;
+
+  switch (direction)
+    {
+    case GDK_SCROLL_UP:
+      delta_y = -1;
+      break;
+    case GDK_SCROLL_DOWN:
+      delta_y = 1;
+      break;
+    case GDK_SCROLL_LEFT:
+      delta_x = -1;
+      break;
+    case GDK_SCROLL_RIGHT:
+      delta_x = 1;
+      break;
+    case GDK_SCROLL_SMOOTH:
+    default:
+      g_assert_not_reached ();
+      break;
+    }
 
   self->tool = tool != NULL ? g_object_ref (tool) : NULL;
   self->state = state;
   self->direction = direction;
+  self->delta_x = delta_x;
+  self->delta_y = delta_y;
   self->unit = GDK_SCROLL_UNIT_WHEEL;
 
   return (GdkEvent *) self;
diff --git a/gtk/gtkeventcontrollerscroll.c b/gtk/gtkeventcontrollerscroll.c
index d78cc01770..e51cb7b241 100644
--- a/gtk/gtkeventcontrollerscroll.c
+++ b/gtk/gtkeventcontrollerscroll.c
@@ -416,25 +416,7 @@ gtk_event_controller_scroll_handle_event (GtkEventController *controller,
     }
   else
     {
-      switch (direction)
-        {
-        case GDK_SCROLL_UP:
-          dy -= 1;
-          break;
-        case GDK_SCROLL_DOWN:
-          dy += 1;
-          break;
-        case GDK_SCROLL_LEFT:
-          dx -= 1;
-          break;
-        case GDK_SCROLL_RIGHT:
-          dx += 1;
-          break;
-        case GDK_SCROLL_SMOOTH:
-        default:
-          g_assert_not_reached ();
-          break;
-        }
+      gdk_scroll_event_get_deltas (event, &dx, &dy);
 
       if ((scroll->flags & GTK_EVENT_CONTROLLER_SCROLL_VERTICAL) == 0)
         dy = 0;