2009-02-16 Alejandro G. Castro <alex@igalia.com>

* src/hildon-pannable-area.c,
	(hildon_pannable_area_class_init): Increased the maximum speed.
	(hildon_pannable_area_get_property),
	(hildon_pannable_area_set_property),
	(hildon_pannable_area_timeout): Added a new low friction mode, it
	allows the user avoid friction when launching the widget fast
	enough. It is interesting to traverse long lists.

diff --git a/ChangeLog b/ChangeLog
index d27fcb1..275b71c 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2009-02-16  Alejandro G. Castro  <alex@igalia.com>
+
+       * src/hildon-pannable-area.c,
+       (hildon_pannable_area_class_init): Increased the maximum speed.
+       (hildon_pannable_area_get_property),
+       (hildon_pannable_area_set_property),
+       (hildon_pannable_area_timeout): Added a new low friction mode, it
+       allows the user avoid friction when launching the widget fast
+       enough. It is interesting to traverse long lists.
+
 2009-02-16  Alberto Garcia  <agarcia@igalia.com>
 
        * src/hildon-stackable-window.c (hildon_stackable_window_class_init)

diff --git a/src/hildon-pannable-area.c b/src/hildon-pannable-area.c
index 5e4d750..ad41243 100644 (file)
--- a/src/hildon-pannable-area.c
+++ b/src/hildon-pannable-area.c
@@ -111,6 +111,7 @@ struct _HildonPannableAreaPrivate {
   gint hovershoot_max;
   gboolean initial_hint;
   gboolean initial_effect;
+  gboolean low_friction_mode;
   gboolean first_drag;
 
   gboolean size_request_policy;
@@ -151,6 +152,7 @@ enum {
   PROP_HOVERSHOOT_MAX,
   PROP_SCROLL_TIME,
   PROP_INITIAL_HINT,
+  PROP_LOW_FRICTION_MODE,
   PROP_SIZE_REQUEST_POLICY,
   PROP_HADJUSTMENT,
   PROP_VADJUSTMENT,
@@ -343,7 +345,7 @@ hildon_pannable_area_class_init (HildonPannableAreaClass * klass)
                                                        "Maximum scroll velocity",
                                                        "Maximum distance the child widget should scroll "
                                                        "per 'frame', in pixels.",
-                                                       0, G_MAXDOUBLE, 60,
+                                                       0, G_MAXDOUBLE, 96,
                                                        G_PARAM_READWRITE |
                                                        G_PARAM_CONSTRUCT));
 
@@ -415,6 +417,15 @@ hildon_pannable_area_class_init (HildonPannableAreaClass * klass)
                                                         G_PARAM_CONSTRUCT));
 
   g_object_class_install_property (object_class,
+                                  PROP_LOW_FRICTION_MODE,
+                                  g_param_spec_boolean ("low-friction-mode",
+                                                        "Do not decelerate the initial velocity",
+                                                        "Avoid decelerating the panning movement, like no friction, the widget will stop in the edges or if the user clicks.",
+                                                        FALSE,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class,
                                    PROP_SIZE_REQUEST_POLICY,
                                   g_param_spec_enum ("size-request-policy",
                                                       "Size Requisition policy",
@@ -582,6 +593,9 @@ hildon_pannable_area_get_property (GObject * object,
   case PROP_INITIAL_HINT:
     g_value_set_boolean (value, priv->initial_hint);
     break;
+  case PROP_LOW_FRICTION_MODE:
+    g_value_set_boolean (value, priv->low_friction_mode);
+    break;
   case PROP_SIZE_REQUEST_POLICY:
     g_value_set_enum (value, priv->size_request_policy);
     break;
@@ -669,6 +683,9 @@ hildon_pannable_area_set_property (GObject * object,
   case PROP_INITIAL_HINT:
     priv->initial_hint = g_value_get_boolean (value);
     break;
+  case PROP_LOW_FRICTION_MODE:
+    priv->low_friction_mode = g_value_get_boolean (value);
+    break;
   case PROP_SIZE_REQUEST_POLICY:
     hildon_pannable_area_set_size_request_policy (HILDON_PANNABLE_AREA (object),
                                                   g_value_get_enum (value));
@@ -1884,8 +1901,15 @@ hildon_pannable_area_timeout (HildonPannableArea * area)
         }
 
       } else {
-        priv->vel_x *= priv->decel;
-        priv->vel_y *= priv->decel;
+        if ((!priv->low_friction_mode) ||
+            ((priv->mov_mode&HILDON_MOVEMENT_MODE_HORIZ) &&
+             (ABS (priv->vel_x) < 0.8*priv->vmax)))
+          priv->vel_x *= priv->decel;
+
+        if ((!priv->low_friction_mode) ||
+            ((priv->mov_mode&HILDON_MOVEMENT_MODE_VERT) &&
+             (ABS (priv->vel_y) < 0.8*priv->vmax)))
+          priv->vel_y *= priv->decel;
 
         if ((ABS (priv->vel_x) < 1.0) && (ABS (priv->vel_y) < 1.0)) {
           priv->vel_x = 0;