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core: Add MetaGestureTracker

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This object tracks both touch sequences happening on the stage and
gestures attached to the stage actor. When a gesture emits
::gesture-begin, All triggering sequences and future ones will be
marked as "accepted" by the compositor, and events will be listened
for meanwhile there are active gestures.

If a sequence goes unclaimed for a short time, it will be
automatically "denied", and punted to the client or shell element
below.
This commit is contained in:
Carlos Garnacho 2014-06-19 22:29:10 +02:00 committed by Jasper St. Pierre
parent 2edf822bc6
commit 59382bace2
3 changed files with 626 additions and 0 deletions
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2
src/Makefile.am
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@ -152,6 +152,8 @@ libmutter_la_SOURCES = \
core/frame.h \
ui/gradient.c \
meta/gradient.h \
core/gesture-tracker.c \
core/gesture-tracker-private.h \
core/keybindings.c \
core/keybindings-private.h \
core/main.c \

83
src/core/gesture-tracker-private.h Normal file
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@ -0,0 +1,83 @@
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/**
* \file gesture-tracker-private.h Manages gestures on windows/desktop
*
* Forwards touch events to clutter actors, and accepts/rejects touch sequences
* based on the outcome of those.
*/
/*
* Copyright (C) 2014 Red Hat
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* Author: Carlos Garnacho <carlosg@gnome.org>
*/
#ifndef META_GESTURE_TRACKER_PRIVATE_H
#define META_GESTURE_TRACKER_PRIVATE_H
#include <glib-object.h>
#include <clutter/clutter.h>
#include <meta/window.h>
#define META_TYPE_GESTURE_TRACKER (meta_gesture_tracker_get_type ())
#define META_GESTURE_TRACKER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_GESTURE_TRACKER, MetaGestureTracker))
#define META_GESTURE_TRACKER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), META_TYPE_GESTURE_TRACKER, MetaGestureTrackerClass))
#define META_IS_GESTURE_TRACKER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), META_TYPE_GESTURE_TRACKER))
#define META_IS_GESTURE_TRACKER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), META_TYPE_GESTURE_TRACKER))
#define META_GESTURE_TRACKER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), META_TYPE_GESTURE_TRACKER, MetaGestureTrackerClass))
typedef struct _MetaGestureTracker MetaGestureTracker;
typedef struct _MetaGestureTrackerClass MetaGestureTrackerClass;
typedef enum {
META_SEQUENCE_NONE,
META_SEQUENCE_ACCEPTED,
META_SEQUENCE_REJECTED,
META_SEQUENCE_PENDING_END
} MetaSequenceState;
struct _MetaGestureTracker
{
GObject parent_instance;
};
struct _MetaGestureTrackerClass
{
GObjectClass parent_class;
void (* state_changed) (MetaGestureTracker *tracker,
ClutterEventSequence *sequence,
MetaSequenceState state);
};
GType meta_gesture_tracker_get_type (void) G_GNUC_CONST;
MetaGestureTracker * meta_gesture_tracker_new (guint autodeny_timeout);
gboolean meta_gesture_tracker_handle_event (MetaGestureTracker *tracker,
const ClutterEvent *event);
gboolean meta_gesture_tracker_set_sequence_state (MetaGestureTracker *tracker,
ClutterEventSequence *sequence,
MetaSequenceState state);
MetaSequenceState meta_gesture_tracker_get_sequence_state (MetaGestureTracker *tracker,
ClutterEventSequence *sequence);
gboolean meta_gesture_tracker_consumes_event (MetaGestureTracker *tracker,
const ClutterEvent *event);
#endif /* META_GESTURE_TRACKER_PRIVATE_H */

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src/core/gesture-tracker.c Normal file
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@ -0,0 +1,541 @@
/*
* Copyright (C) 2014 Red Hat
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* Author: Carlos Garnacho <carlosg@gnome.org>
*/
#include "config.h"
#include "gesture-tracker-private.h"
#include "meta-surface-actor.h"
typedef struct _MetaGestureTrackerPrivate MetaGestureTrackerPrivate;
typedef struct _GestureActionData GestureActionData;
typedef struct _MetaSequenceInfo MetaSequenceInfo;
struct _MetaSequenceInfo
{
MetaGestureTracker *tracker;
ClutterEventSequence *sequence;
MetaSequenceState state;
guint autodeny_timeout_id;
};
struct _GestureActionData
{
ClutterGestureAction *gesture;
MetaSequenceState state;
guint gesture_begin_id;
guint gesture_end_id;
guint gesture_cancel_id;
};
struct _MetaGestureTrackerPrivate
{
GHashTable *sequences; /* Hashtable of ClutterEventSequence->MetaSequenceInfo */
MetaSequenceState stage_state;
GArray *stage_gestures; /* Array of GestureActionData */
GList *listeners; /* List of ClutterGestureAction */
guint autodeny_timeout;
};
enum {
PROP_0,
PROP_AUTODENY_TIMEOUT,
LAST_PROP,
};
static GParamSpec *obj_props[LAST_PROP];
enum {
STATE_CHANGED,
N_SIGNALS
};
static guint signals[N_SIGNALS] = { 0 };
#define DEFAULT_AUTODENY_TIMEOUT 150
static void meta_gesture_tracker_untrack_stage (MetaGestureTracker *tracker);
G_DEFINE_TYPE_WITH_PRIVATE (MetaGestureTracker, meta_gesture_tracker, G_TYPE_OBJECT)
static void
meta_gesture_tracker_finalize (GObject *object)
{
MetaGestureTrackerPrivate *priv;
priv = meta_gesture_tracker_get_instance_private (META_GESTURE_TRACKER (object));
g_hash_table_destroy (priv->sequences);
g_array_free (priv->stage_gestures, TRUE);
g_list_free (priv->listeners);
G_OBJECT_CLASS (meta_gesture_tracker_parent_class)->finalize (object);
}
static void
meta_gesture_tracker_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
MetaGestureTrackerPrivate *priv;
priv = meta_gesture_tracker_get_instance_private (META_GESTURE_TRACKER (object));
switch (prop_id)
{
case PROP_AUTODENY_TIMEOUT:
priv->autodeny_timeout = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
meta_gesture_tracker_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
MetaGestureTrackerPrivate *priv;
priv = meta_gesture_tracker_get_instance_private (META_GESTURE_TRACKER (object));
switch (prop_id)
{
case PROP_AUTODENY_TIMEOUT:
g_value_set_uint (value, priv->autodeny_timeout);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
meta_gesture_tracker_class_init (MetaGestureTrackerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = meta_gesture_tracker_finalize;
object_class->set_property = meta_gesture_tracker_set_property;
object_class->get_property = meta_gesture_tracker_get_property;
obj_props[PROP_AUTODENY_TIMEOUT] = g_param_spec_uint ("autodeny-timeout",
"Auto-deny timeout",
"Auto-deny timeout",
0, G_MAXUINT, DEFAULT_AUTODENY_TIMEOUT,
G_PARAM_STATIC_STRINGS |
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY);
g_object_class_install_properties (object_class, LAST_PROP, obj_props);
signals[STATE_CHANGED] =
g_signal_new ("state-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (MetaGestureTrackerClass, state_changed),
NULL, NULL, NULL,
G_TYPE_NONE, 2, G_TYPE_POINTER, G_TYPE_UINT);
}
static gboolean
autodeny_sequence (gpointer user_data)
{
MetaSequenceInfo *info = user_data;
/* Deny the sequence automatically after the given timeout */
if (info->state == META_SEQUENCE_NONE)
meta_gesture_tracker_set_sequence_state (info->tracker, info->sequence,
META_SEQUENCE_REJECTED);
info->autodeny_timeout_id = 0;
return G_SOURCE_REMOVE;
}
static MetaSequenceInfo *
meta_sequence_info_new (MetaGestureTracker *tracker,
const ClutterEvent *event)
{
MetaGestureTrackerPrivate *priv;
MetaSequenceInfo *info;
guint ms;
priv = meta_gesture_tracker_get_instance_private (tracker);
ms = priv->autodeny_timeout;
info = g_slice_new0 (MetaSequenceInfo);
info->tracker = tracker;
info->sequence = event->touch.sequence;
info->state = META_SEQUENCE_NONE;
info->autodeny_timeout_id = g_timeout_add (ms, autodeny_sequence, info);
return info;
}
static void
meta_sequence_info_free (MetaSequenceInfo *info)
{
if (info->autodeny_timeout_id)
g_source_remove (info->autodeny_timeout_id);
if (info->state == META_SEQUENCE_NONE)
meta_gesture_tracker_set_sequence_state (info->tracker, info->sequence,
META_SEQUENCE_REJECTED);
g_slice_free (MetaSequenceInfo, info);
}
static gboolean
state_is_applicable (MetaSequenceState prev_state,
MetaSequenceState state)
{
if (prev_state == META_SEQUENCE_PENDING_END)
return FALSE;
/* Don't allow reverting to none */
if (state == META_SEQUENCE_NONE)
return FALSE;
/* PENDING_END state is final */
if (prev_state == META_SEQUENCE_PENDING_END)
return FALSE;
/* Sequences must be accepted/denied before PENDING_END */
if (prev_state == META_SEQUENCE_NONE &&
state == META_SEQUENCE_PENDING_END)
return FALSE;
/* Make sequences stick to their accepted/denied state */
if (state != META_SEQUENCE_PENDING_END &&
prev_state != META_SEQUENCE_NONE)
return FALSE;
return TRUE;
}
static gboolean
meta_gesture_tracker_set_state (MetaGestureTracker *tracker,
MetaSequenceState state)
{
MetaGestureTrackerPrivate *priv;
ClutterEventSequence *sequence;
GHashTableIter iter;
priv = meta_gesture_tracker_get_instance_private (tracker);
if (priv->stage_state != state &&
!state_is_applicable (priv->stage_state, state))
return FALSE;
g_hash_table_iter_init (&iter, priv->sequences);
priv->stage_state = state;
while (g_hash_table_iter_next (&iter, (gpointer*) &sequence, NULL))
meta_gesture_tracker_set_sequence_state (tracker, sequence, state);
return TRUE;
}
static gboolean
gesture_begin_cb (ClutterGestureAction *gesture,
ClutterActor *actor,
MetaGestureTracker *tracker)
{
MetaGestureTrackerPrivate *priv;
priv = meta_gesture_tracker_get_instance_private (tracker);
if (!g_list_find (priv->listeners, gesture) &&
meta_gesture_tracker_set_state (tracker, META_SEQUENCE_ACCEPTED))
priv->listeners = g_list_prepend (priv->listeners, gesture);
return TRUE;
}
static void
gesture_end_cb (ClutterGestureAction *gesture,
ClutterActor *actor,
MetaGestureTracker *tracker)
{
MetaGestureTrackerPrivate *priv;
priv = meta_gesture_tracker_get_instance_private (tracker);
priv->listeners = g_list_remove (priv->listeners, gesture);
if (!priv->listeners)
meta_gesture_tracker_untrack_stage (tracker);
}
static void
gesture_cancel_cb (ClutterGestureAction *gesture,
ClutterActor *actor,
MetaGestureTracker *tracker)
{
MetaGestureTrackerPrivate *priv;
priv = meta_gesture_tracker_get_instance_private (tracker);
if (g_list_find (priv->listeners, gesture))
{
priv->listeners = g_list_remove (priv->listeners, gesture);
if (!priv->listeners)
meta_gesture_tracker_set_state (tracker, META_SEQUENCE_PENDING_END);
}
}
static gboolean
cancel_and_unref_gesture_cb (ClutterGestureAction *action)
{
clutter_gesture_action_cancel (action);
g_object_unref (action);
return G_SOURCE_REMOVE;
}
static void
clear_gesture_data (GestureActionData *data)
{
g_signal_handler_disconnect (data->gesture, data->gesture_begin_id);
g_signal_handler_disconnect (data->gesture, data->gesture_end_id);
g_signal_handler_disconnect (data->gesture, data->gesture_cancel_id);
/* Defer cancellation to an idle, as it may happen within event handling */
g_idle_add ((GSourceFunc) cancel_and_unref_gesture_cb, data->gesture);
}
static void
meta_gesture_tracker_init (MetaGestureTracker *tracker)
{
MetaGestureTrackerPrivate *priv;
priv = meta_gesture_tracker_get_instance_private (tracker);
priv->sequences = g_hash_table_new_full (NULL, NULL, NULL,
(GDestroyNotify) meta_sequence_info_free);
priv->stage_gestures = g_array_new (FALSE, FALSE, sizeof (GestureActionData));
g_array_set_clear_func (priv->stage_gestures, (GDestroyNotify) clear_gesture_data);
}
MetaGestureTracker *
meta_gesture_tracker_new (guint autodeny_timeout)
{
return g_object_new (META_TYPE_GESTURE_TRACKER,
"autodeny-timeout", autodeny_timeout,
NULL);
}
static void
meta_gesture_tracker_track_stage (MetaGestureTracker *tracker,
ClutterActor *stage)
{
MetaGestureTrackerPrivate *priv;
GList *actions, *l;
priv = meta_gesture_tracker_get_instance_private (tracker);
actions = clutter_actor_get_actions (stage);
for (l = actions; l; l = l->next)
{
GestureActionData data;
if (!CLUTTER_IS_GESTURE_ACTION (l->data))
continue;
data.gesture = g_object_ref (l->data);
data.state = META_SEQUENCE_NONE;
data.gesture_begin_id =
g_signal_connect (data.gesture, "gesture-begin",
G_CALLBACK (gesture_begin_cb), tracker);
data.gesture_end_id =
g_signal_connect (data.gesture, "gesture-end",
G_CALLBACK (gesture_end_cb), tracker);
data.gesture_cancel_id =
g_signal_connect (data.gesture, "gesture-cancel",
G_CALLBACK (gesture_cancel_cb), tracker);
g_array_append_val (priv->stage_gestures, data);
}
g_list_free (actions);
}
static void
meta_gesture_tracker_untrack_stage (MetaGestureTracker *tracker)
{
MetaGestureTrackerPrivate *priv;
priv = meta_gesture_tracker_get_instance_private (tracker);
priv->stage_state = META_SEQUENCE_NONE;
g_hash_table_remove_all (priv->sequences);
if (priv->stage_gestures->len > 0)
g_array_remove_range (priv->stage_gestures, 0, priv->stage_gestures->len);
g_list_free (priv->listeners);
priv->listeners = NULL;
}
gboolean
meta_gesture_tracker_handle_event (MetaGestureTracker *tracker,
const ClutterEvent *event)
{
MetaGestureTrackerPrivate *priv;
ClutterEventSequence *sequence;
MetaSequenceInfo *info;
ClutterActor *stage;
sequence = clutter_event_get_event_sequence (event);
if (!sequence)
return FALSE;
priv = meta_gesture_tracker_get_instance_private (tracker);
stage = CLUTTER_ACTOR (clutter_event_get_stage (event));
switch (event->type)
{
case CLUTTER_TOUCH_BEGIN:
if (g_hash_table_size (priv->sequences) == 0)
meta_gesture_tracker_track_stage (tracker, stage);
info = meta_sequence_info_new (tracker, event);
g_hash_table_insert (priv->sequences, sequence, info);
if (priv->stage_gestures->len == 0)
{
/* If no gestures are attached, reject the sequence right away */
meta_gesture_tracker_set_sequence_state (tracker, sequence,
META_SEQUENCE_REJECTED);
}
else if (priv->stage_state != META_SEQUENCE_NONE)
{
/* Make the sequence state match the general state */
meta_gesture_tracker_set_sequence_state (tracker, sequence,
priv->stage_state);
}
break;
case CLUTTER_TOUCH_END:
info = g_hash_table_lookup (priv->sequences, sequence);
if (!info)
return FALSE;
/* If nothing was done yet about the sequence, reject it so X11
* clients may see it
*/
if (info->state == META_SEQUENCE_NONE)
meta_gesture_tracker_set_sequence_state (tracker, sequence,
META_SEQUENCE_REJECTED);
g_hash_table_remove (priv->sequences, sequence);
if (g_hash_table_size (priv->sequences) == 0)
meta_gesture_tracker_untrack_stage (tracker);
break;
case CLUTTER_TOUCH_UPDATE:
break;
default:
return FALSE;
break;
}
return TRUE;
}
gboolean
meta_gesture_tracker_set_sequence_state (MetaGestureTracker *tracker,
ClutterEventSequence *sequence,
MetaSequenceState state)
{
MetaGestureTrackerPrivate *priv;
MetaSequenceInfo *info;
g_return_val_if_fail (META_IS_GESTURE_TRACKER (tracker), FALSE);
priv = meta_gesture_tracker_get_instance_private (tracker);
info = g_hash_table_lookup (priv->sequences, sequence);
if (!info)
return FALSE;
else if (state == info->state)
return TRUE;
if (!state_is_applicable (info->state, state))
return FALSE;
/* Unset autodeny timeout */
if (info->autodeny_timeout_id)
{
g_source_remove (info->autodeny_timeout_id);
info->autodeny_timeout_id = 0;
}
info->state = state;
g_signal_emit (tracker, signals[STATE_CHANGED], 0, sequence, info->state);
/* If the sequence was denied, set immediately to PENDING_END after emission */
if (state == META_SEQUENCE_REJECTED)
{
info->state = META_SEQUENCE_PENDING_END;
g_signal_emit (tracker, signals[STATE_CHANGED], 0, sequence, info->state);
}
return TRUE;
}
MetaSequenceState
meta_gesture_tracker_get_sequence_state (MetaGestureTracker *tracker,
ClutterEventSequence *sequence)
{
MetaGestureTrackerPrivate *priv;
MetaSequenceInfo *info;
g_return_val_if_fail (META_IS_GESTURE_TRACKER (tracker), META_SEQUENCE_PENDING_END);
priv = meta_gesture_tracker_get_instance_private (tracker);
info = g_hash_table_lookup (priv->sequences, sequence);
if (!info)
return META_SEQUENCE_PENDING_END;
return info->state;
}
gboolean
meta_gesture_tracker_consumes_event (MetaGestureTracker *tracker,
const ClutterEvent *event)
{
ClutterEventSequence *sequence;
MetaSequenceState state;
g_return_val_if_fail (META_IS_GESTURE_TRACKER (tracker), FALSE);
sequence = clutter_event_get_event_sequence (event);
if (!sequence)
return FALSE;
state = meta_gesture_tracker_get_sequence_state (tracker, sequence);
return (event->type != CLUTTER_TOUCH_END &&
(state == META_SEQUENCE_REJECTED || state == META_SEQUENCE_PENDING_END));
}