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scrolledwindow: Allow overshooting on scroll events

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The overshoot visual notification is probably also nice to have in this
context.

https://bugzilla.gnome.org/show_bug.cgi?id=738533
This commit is contained in:
Carlos Garnacho 2014-10-12 13:22:43 +02:00
parent 582adcab1a
commit 103e11c937
1 changed files with 48 additions and 14 deletions
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62
gtk/gtkscrolledwindow.c
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@ -153,6 +153,8 @@ struct _GtkScrolledWindowPrivate
gint min_content_width;
gint min_content_height;
guint scroll_events_overshoot_id;
/* Kinetic scrolling */
GtkGesture *long_press_gesture;
GtkGesture *swipe_gesture;
@ -1458,6 +1460,12 @@ gtk_scrolled_window_destroy (GtkWidget *widget)
priv->deceleration_id = 0;
}
if (priv->scroll_events_overshoot_id)
{
g_source_remove (priv->scroll_events_overshoot_id);
priv->scroll_events_overshoot_id = 0;
}
g_clear_object (&priv->drag_gesture);
g_clear_object (&priv->swipe_gesture);
g_clear_object (&priv->long_press_gesture);
@ -2375,6 +2383,18 @@ gtk_scrolled_window_size_allocate (GtkWidget *widget,
gtk_scrolled_window_check_attach_pan_gesture (scrolled_window);
}
static gboolean
start_scroll_deceleration_cb (gpointer user_data)
{
GtkScrolledWindow *scrolled_window = user_data;
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
priv->scroll_events_overshoot_id = 0;
gtk_scrolled_window_start_deceleration (scrolled_window);
return FALSE;
}
static gboolean
gtk_scrolled_window_scroll_event (GtkWidget *widget,
GdkEventScroll *event)
@ -2389,6 +2409,8 @@ gtk_scrolled_window_scroll_event (GtkWidget *widget,
scrolled_window = GTK_SCROLLED_WINDOW (widget);
priv = scrolled_window->priv;
gtk_scrolled_window_invalidate_overshoot (scrolled_window);
if (gdk_event_get_scroll_deltas ((GdkEvent *) event, &delta_x, &delta_y))
{
if (delta_x != 0.0 &&
@ -2408,13 +2430,9 @@ gtk_scrolled_window_scroll_event (GtkWidget *widget,
scroll_unit = pow (page_size, 2.0 / 3.0);
#endif
new_value = CLAMP (gtk_adjustment_get_value (adj) + delta_x * scroll_unit,
gtk_adjustment_get_lower (adj),
gtk_adjustment_get_upper (adj) -
gtk_adjustment_get_page_size (adj));
gtk_adjustment_set_value (adj, new_value);
new_value = priv->unclamped_hadj_value + delta_x * scroll_unit;
_gtk_scrolled_window_set_adjustment_value (scrolled_window, adj,
new_value);
handled = TRUE;
}
@ -2435,13 +2453,9 @@ gtk_scrolled_window_scroll_event (GtkWidget *widget,
scroll_unit = pow (page_size, 2.0 / 3.0);
#endif
new_value = CLAMP (gtk_adjustment_get_value (adj) + delta_y * scroll_unit,
gtk_adjustment_get_lower (adj),
gtk_adjustment_get_upper (adj) -
gtk_adjustment_get_page_size (adj));
gtk_adjustment_set_value (adj, new_value);
new_value = priv->unclamped_vadj_value + delta_y * scroll_unit;
_gtk_scrolled_window_set_adjustment_value (scrolled_window, adj,
new_value);
handled = TRUE;
}
}
@ -2479,6 +2493,26 @@ gtk_scrolled_window_scroll_event (GtkWidget *widget,
}
}
if (handled)
{
gtk_scrolled_window_cancel_deceleration (scrolled_window);
gtk_scrolled_window_invalidate_overshoot (scrolled_window);
if (priv->scroll_events_overshoot_id)
{
g_source_remove (priv->scroll_events_overshoot_id);
priv->scroll_events_overshoot_id = 0;
}
if (_gtk_scrolled_window_get_overshoot (scrolled_window, NULL, NULL))
{
priv->scroll_events_overshoot_id =
gdk_threads_add_timeout (50, start_scroll_deceleration_cb, scrolled_window);
g_source_set_name_by_id (priv->scroll_events_overshoot_id,
"[gtk+] start_scroll_deceleration_cb");
}
}
return handled;
}