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barrier: Add support for new barrier features in XInput 2.3

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XInput 2.3 adds support for "barrier events", which let us know when
a pointer barrier has been hit, and when the pointer has stopped
hitting the barrier, and lets us "release" the barrier, temporarily
letting the pointer pass through the barrier. These features can be
combined to allow for certain pointer gestures, such as "pushing"
against the bottom of the screen, or stopping the pointer on monitor
edges while dragging slowly for increased edge precision.

This commit should allow graceful fallback if servers with
XInput 2.3 aren't supported.

https://bugzilla.gnome.org/show_bug.cgi?id=677215
This commit is contained in:
Jasper St. Pierre
2012-07-30 15:57:53 -03:00
parent 8b21df92f0
commit 57c31a56f4
7 changed files with 278 additions and 3 deletions
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154
src/core/barrier.c
View File

@@ -4,6 +4,7 @@
#include <glib-object.h>
#include <X11/extensions/XInput2.h>
#include <X11/extensions/Xfixes.h>
#include <meta/util.h>
#include <meta/barrier.h>
@@ -29,6 +30,15 @@ enum {
static GParamSpec *obj_props[PROP_LAST];
enum {
HIT,
LEFT,
LAST_SIGNAL,
};
static guint obj_signals[LAST_SIGNAL];
struct _MetaBarrierPrivate
{
MetaDisplay *display;
@@ -133,6 +143,31 @@ meta_barrier_is_active (MetaBarrier *barrier)
return barrier->priv->xbarrier != 0;
}
/**
* meta_barrier_release:
* @barrier: The barrier to release
* @event: The event to release the pointer for
*
* In XI2.3, pointer barriers provide a feature where they can
* be temporarily released so that the pointer goes through
* them. Pass a #MetaBarrierEvent to release the barrier for
* this event sequence.
*/
void
meta_barrier_release (MetaBarrier *barrier,
MetaBarrierEvent *event)
{
#ifdef HAVE_XI23
MetaBarrierPrivate *priv = barrier->priv;
if (META_DISPLAY_HAS_XINPUT_23 (priv->display))
{
XIBarrierReleasePointer (priv->display->xdisplay,
META_VIRTUAL_CORE_POINTER_ID,
priv->xbarrier, event->event_id);
}
#endif /* HAVE_XI23 */
}
static void
meta_barrier_constructed (GObject *object)
{
@@ -157,6 +192,12 @@ meta_barrier_constructed (GObject *object)
priv->x2, priv->y2,
priv->directions, 0, NULL);
/* Take a ref that we'll release when the XID dies inside destroy(),
* so that the object stays alive and doesn't get GC'd. */
g_object_ref (barrier);
g_hash_table_insert (priv->display->window_ids, &priv->xbarrier, barrier);
G_OBJECT_CLASS (meta_barrier_parent_class)->constructed (object);
}
@@ -215,6 +256,42 @@ meta_barrier_class_init (MetaBarrierClass *klass)
g_object_class_install_properties (object_class, PROP_LAST, obj_props);
/**
* MetaBarrier::hit:
* @barrier: The #MetaBarrier that was hit
* @event: A #MetaBarrierEvent that has the details of how
* the barrier was hit.
*
* When a pointer barrier is hit, this will trigger. This
* requires an XI2-enabled server.
*/
obj_signals[HIT] =
g_signal_new ("hit",
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_FIRST,
0,
NULL, NULL, NULL,
G_TYPE_NONE, 1,
META_TYPE_BARRIER_EVENT);
/**
* MetaBarrier::left:
* @barrier: The #MetaBarrier that was left
* @event: A #MetaBarrierEvent that has the details of how
* the barrier was left.
*
* When a pointer barrier hitbox was left, this will trigger.
* This requires an XI2-enabled server.
*/
obj_signals[LEFT] =
g_signal_new ("left",
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_FIRST,
0,
NULL, NULL, NULL,
G_TYPE_NONE, 1,
META_TYPE_BARRIER_EVENT);
g_type_class_add_private (object_class, sizeof(MetaBarrierPrivate));
}
@@ -233,7 +310,10 @@ meta_barrier_destroy (MetaBarrier *barrier)
return;
XFixesDestroyPointerBarrier (dpy, priv->xbarrier);
g_hash_table_remove (priv->display->window_ids, &priv->xbarrier);
priv->xbarrier = 0;
g_object_unref (barrier);
}
static void
@@ -241,3 +321,77 @@ meta_barrier_init (MetaBarrier *barrier)
{
barrier->priv = G_TYPE_INSTANCE_GET_PRIVATE (barrier, META_TYPE_BARRIER, MetaBarrierPrivate);
}
#ifdef HAVE_XI23
static void
meta_barrier_fire_event (MetaBarrier *barrier,
XIBarrierEvent *xevent)
{
MetaBarrierEvent *event = g_slice_new0 (MetaBarrierEvent);
event->ref_count = 1;
event->event_id = xevent->eventid;
event->dt = xevent->dtime;
event->x = xevent->root_x;
event->y = xevent->root_y;
event->dx = xevent->dx;
event->dy = xevent->dy;
event->released = (xevent->flags & XIBarrierPointerReleased) != 0;
event->grabbed = (xevent->flags & XIBarrierDeviceIsGrabbed) != 0;
switch (xevent->evtype)
{
case XI_BarrierHit:
g_signal_emit (barrier, obj_signals[HIT], 0, event);
break;
case XI_BarrierLeave:
g_signal_emit (barrier, obj_signals[LEFT], 0, event);
break;
default:
g_assert_not_reached ();
}
}
gboolean
meta_display_process_barrier_event (MetaDisplay *display,
XIBarrierEvent *xev)
{
MetaBarrier *barrier;
barrier = g_hash_table_lookup (display->window_ids, &xev->barrier);
if (barrier != NULL)
{
meta_barrier_fire_event (barrier, xev);
return TRUE;
}
return FALSE;
}
#endif /* HAVE_XI23 */
static MetaBarrierEvent *
meta_barrier_event_ref (MetaBarrierEvent *event)
{
g_return_val_if_fail (event != NULL, NULL);
g_return_val_if_fail (event->ref_count > 0, NULL);
g_atomic_int_inc ((volatile int *)&event->ref_count);
return event;
}
static void
meta_barrier_event_unref (MetaBarrierEvent *event)
{
g_return_if_fail (event != NULL);
g_return_if_fail (event->ref_count > 0);
if (g_atomic_int_dec_and_test ((volatile int *)&event->ref_count))
g_slice_free (MetaBarrierEvent, event);
}
G_DEFINE_BOXED_TYPE (MetaBarrierEvent,
meta_barrier_event,
meta_barrier_event_ref,
meta_barrier_event_unref)