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gdk: Add delta_x/y to scroll events

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gdk_event_get_scroll_deltas() can be used to retrieve those
values on smooth scroll events.
This commit is contained in:
Michael Natterer 2012-01-23 23:37:44 +01:00 committed by Matthias Clasen
parent 7b48a3c0bd
commit 0efbbc6435
4 changed files with 57 additions and 0 deletions
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1
docs/reference/gdk/gdk3-sections.txt
View File

@ -788,6 +788,7 @@ gdk_event_get_keycode
gdk_event_get_keyval
gdk_event_get_root_coords
gdk_event_get_scroll_direction
gdk_event_get_scroll_deltas
gdk_event_get_state
gdk_event_get_time
GdkEventSequence

1
gdk/gdk.symbols
View File

@ -165,6 +165,7 @@ gdk_event_get_keyval
gdk_event_get_root_coords
gdk_event_get_screen
gdk_event_get_scroll_direction
gdk_event_get_scroll_deltas
gdk_event_get_source_device
gdk_event_get_state
gdk_event_get_time

48
gdk/gdkevents.c
View File

@ -471,6 +471,8 @@ gdk_event_new (GdkEventType type)
new_event->scroll.y = 0.;
new_event->scroll.x_root = 0.;
new_event->scroll.y_root = 0.;
new_event->scroll.delta_x = 0.;
new_event->scroll.delta_y = 0.;
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
@ -1207,6 +1209,52 @@ gdk_event_get_scroll_direction (const GdkEvent *event,
return fetched;
}
/**
* gdk_event_get_scroll_deltas:
* @event: a #GdkEvent
* @delta_x: return location for X delta
* @delta_y: return location for Y delta
*
* Retrieves the scroll deltas from a #GdkEvent
*
* Returns: %TRUE if the event contains smooth scroll information
*
* Since: 3.4
**/
gboolean
gdk_event_get_scroll_deltas (const GdkEvent *event,
gdouble *delta_x,
gdouble *delta_y)
{
gboolean fetched = TRUE;
gdouble dx = 0.0;
gdouble dy = 0.0;
switch (event->type)
{
case GDK_SCROLL:
if (event->scroll.direction == GDK_SCROLL_SMOOTH)
{
dx = event->scroll.delta_x;
dy = event->scroll.delta_y;
}
else
fetched = FALSE;
break;
default:
fetched = FALSE;
break;
}
if (delta_x)
*delta_x = dx;
if (delta_y)
*delta_y = dy;
return fetched;
}
/**
* gdk_event_get_axis:
* @event: a #GdkEvent

7
gdk/gdkevents.h
View File

@ -759,6 +759,8 @@ struct _GdkEventScroll
GdkScrollDirection direction;
GdkDevice *device;
gdouble x_root, y_root;
gdouble delta_x;
gdouble delta_y;
};
/**
@ -1203,6 +1205,11 @@ gboolean gdk_event_get_keycode (const GdkEvent *event,
GDK_AVAILABLE_IN_3_2
gboolean gdk_event_get_scroll_direction (const GdkEvent *event,
GdkScrollDirection *direction);
GDK_AVAILABLE_IN_3_4
gboolean gdk_event_get_scroll_deltas (const GdkEvent *event,
gdouble *delta_x,
gdouble *delta_y);
gboolean gdk_event_get_axis (const GdkEvent *event,
GdkAxisUse axis_use,
gdouble *value);