Modified the overshooting effect to make it faster

* hildon/hildon-pannable-area.c,
(hildon_pannable_area_class_init): Increased the overshooting max
speed to get a faster effect.
(hildon_pannable_axis_scroll): Increased minimum speed and reduce
deceleration of the overshooting
(hildon_pannable_area_button_release_cb): Calculate initial
overshooting speed when finger on the screen using the distance to
launch the effect faster.

Fixes: NB#126115 (Pannable list overshooting is unusably slow for
lists with slow row renderers)

diff --git a/ChangeLog b/ChangeLog
index bb57f38..7f17772 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2009-08-06  Alejandro G. Castro  <alex@igalia.com>
+
+       * hildon/hildon-pannable-area.c,
+       (hildon_pannable_area_class_init): Increased the overshooting max
+       speed to get a faster effect.
+       (hildon_pannable_axis_scroll): Increased minimum speed and reduce
+       deceleration of the overshooting
+       (hildon_pannable_area_button_release_cb): Calculate initial
+       overshooting speed when finger on the screen using the distance to
+       launch the effect faster.
+
+       Fixes: NB#126115 (Pannable list overshooting is unusably slow for
+       lists with slow row renderers)
+
 2009-08-05  Alberto Garcia  <agarcia@igalia.com>
 
        * doc/hildon-sections.txt: Add new functions

diff --git a/hildon/hildon-pannable-area.c b/hildon/hildon-pannable-area.c
index ac17729..86342e4 100644 (file)
--- a/hildon/hildon-pannable-area.c
+++ b/hildon/hildon-pannable-area.c
@@ -411,7 +411,7 @@ hildon_pannable_area_class_init (HildonPannableAreaClass * klass)
                                                        "Maximum scroll velocity when overshooting",
                                                        "Maximum distance the child widget should scroll "
                                                        "per 'frame', in pixels per frame when it overshoots after hitting the edge.",
-                                                       0, G_MAXDOUBLE, 20,
+                                                       0, G_MAXDOUBLE, 130,
                                                        G_PARAM_READWRITE |
                                                        G_PARAM_CONSTRUCT));
 
@@ -2165,7 +2165,7 @@ hildon_pannable_axis_scroll (HildonPannableArea *area,
           *vel *= -1;
         } else if ((*overshooting > 1) && (*vel < 0)) {
           /* we add the MIN in order to avoid very small speeds */
-          *vel = MIN ((((gdouble)*overshot_dist)*0.4) * -1, -2.0);
+          *vel = MIN (((((gdouble)*overshot_dist)*0.8) * -1), -10.0);
         }
 
         *overshot_dist = CLAMP (*overshot_dist + *vel, 0, overshoot_max);
@@ -2181,7 +2181,7 @@ hildon_pannable_axis_scroll (HildonPannableArea *area,
           *vel *= -1;
         } else if ((*overshooting > 1) && (*vel > 0)) {
           /* we add the MAX in order to avoid very small speeds */
-          *vel = MAX ((((gdouble)*overshot_dist)*0.4) * -1, 2.0);
+          *vel = MAX (((((gdouble)*overshot_dist)*0.8) * -1), 10.0);
         }
 
         *overshot_dist = CLAMP (*overshot_dist + (*vel), -overshoot_max, 0);
@@ -2715,12 +2715,12 @@ hildon_pannable_area_button_release_cb (GtkWidget * widget,
   /* If overshoot has been initiated with a finger down, on release set max speed */
   if (priv->overshot_dist_y != 0) {
     priv->overshooting_y = priv->bounce_steps; /* Hack to stop a bounce in the finger down case */
-    priv->vel_y = priv->vmax_overshooting;
+    priv->vel_y = priv->overshot_dist_y * 0.9;
   }
 
   if (priv->overshot_dist_x != 0) {
     priv->overshooting_x = priv->bounce_steps; /* Hack to stop a bounce in the finger down case */
-    priv->vel_x = priv->vmax_overshooting;
+    priv->vel_x = priv->overshot_dist_x * 0.9;
   }
 
   priv->button_pressed = FALSE;