mirror of
https://github.com/brl/mutter.git
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core: Add MetaGestureTracker
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
Jasper St. Pierre
parent
2edf822bc6
commit
59382bace2
@ -152,6 +152,8 @@ libmutter_la_SOURCES = \
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core/frame.h \
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ui/gradient.c \
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meta/gradient.h \
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core/gesture-tracker.c \
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core/gesture-tracker-private.h \
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core/keybindings.c \
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core/keybindings-private.h \
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core/main.c \
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83
src/core/gesture-tracker-private.h
Normal file
83
src/core/gesture-tracker-private.h
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@ -0,0 +1,83 @@
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/**
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* \file gesture-tracker-private.h Manages gestures on windows/desktop
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*
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* Forwards touch events to clutter actors, and accepts/rejects touch sequences
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* based on the outcome of those.
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*/
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/*
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* Copyright (C) 2014 Red Hat
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*
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* Author: Carlos Garnacho <carlosg@gnome.org>
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*/
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#ifndef META_GESTURE_TRACKER_PRIVATE_H
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#define META_GESTURE_TRACKER_PRIVATE_H
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#include <glib-object.h>
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#include <clutter/clutter.h>
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#include <meta/window.h>
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#define META_TYPE_GESTURE_TRACKER (meta_gesture_tracker_get_type ())
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#define META_GESTURE_TRACKER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_GESTURE_TRACKER, MetaGestureTracker))
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#define META_GESTURE_TRACKER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), META_TYPE_GESTURE_TRACKER, MetaGestureTrackerClass))
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#define META_IS_GESTURE_TRACKER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), META_TYPE_GESTURE_TRACKER))
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#define META_IS_GESTURE_TRACKER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), META_TYPE_GESTURE_TRACKER))
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#define META_GESTURE_TRACKER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), META_TYPE_GESTURE_TRACKER, MetaGestureTrackerClass))
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typedef struct _MetaGestureTracker MetaGestureTracker;
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typedef struct _MetaGestureTrackerClass MetaGestureTrackerClass;
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typedef enum {
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META_SEQUENCE_NONE,
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META_SEQUENCE_ACCEPTED,
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META_SEQUENCE_REJECTED,
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META_SEQUENCE_PENDING_END
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} MetaSequenceState;
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struct _MetaGestureTracker
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{
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GObject parent_instance;
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};
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struct _MetaGestureTrackerClass
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{
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GObjectClass parent_class;
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void (* state_changed) (MetaGestureTracker *tracker,
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ClutterEventSequence *sequence,
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MetaSequenceState state);
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};
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GType meta_gesture_tracker_get_type (void) G_GNUC_CONST;
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MetaGestureTracker * meta_gesture_tracker_new (guint autodeny_timeout);
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gboolean meta_gesture_tracker_handle_event (MetaGestureTracker *tracker,
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const ClutterEvent *event);
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gboolean meta_gesture_tracker_set_sequence_state (MetaGestureTracker *tracker,
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ClutterEventSequence *sequence,
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MetaSequenceState state);
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MetaSequenceState meta_gesture_tracker_get_sequence_state (MetaGestureTracker *tracker,
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ClutterEventSequence *sequence);
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gboolean meta_gesture_tracker_consumes_event (MetaGestureTracker *tracker,
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const ClutterEvent *event);
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#endif /* META_GESTURE_TRACKER_PRIVATE_H */
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541
src/core/gesture-tracker.c
Normal file
541
src/core/gesture-tracker.c
Normal file
@ -0,0 +1,541 @@
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/*
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* Copyright (C) 2014 Red Hat
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*
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* Author: Carlos Garnacho <carlosg@gnome.org>
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*/
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#include "config.h"
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#include "gesture-tracker-private.h"
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#include "meta-surface-actor.h"
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typedef struct _MetaGestureTrackerPrivate MetaGestureTrackerPrivate;
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typedef struct _GestureActionData GestureActionData;
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typedef struct _MetaSequenceInfo MetaSequenceInfo;
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struct _MetaSequenceInfo
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{
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MetaGestureTracker *tracker;
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ClutterEventSequence *sequence;
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MetaSequenceState state;
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guint autodeny_timeout_id;
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};
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struct _GestureActionData
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{
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ClutterGestureAction *gesture;
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MetaSequenceState state;
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guint gesture_begin_id;
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guint gesture_end_id;
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guint gesture_cancel_id;
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};
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struct _MetaGestureTrackerPrivate
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{
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GHashTable *sequences; /* Hashtable of ClutterEventSequence->MetaSequenceInfo */
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MetaSequenceState stage_state;
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GArray *stage_gestures; /* Array of GestureActionData */
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GList *listeners; /* List of ClutterGestureAction */
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guint autodeny_timeout;
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};
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enum {
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PROP_0,
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PROP_AUTODENY_TIMEOUT,
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LAST_PROP,
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};
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static GParamSpec *obj_props[LAST_PROP];
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enum {
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STATE_CHANGED,
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N_SIGNALS
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};
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static guint signals[N_SIGNALS] = { 0 };
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#define DEFAULT_AUTODENY_TIMEOUT 150
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static void meta_gesture_tracker_untrack_stage (MetaGestureTracker *tracker);
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G_DEFINE_TYPE_WITH_PRIVATE (MetaGestureTracker, meta_gesture_tracker, G_TYPE_OBJECT)
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static void
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meta_gesture_tracker_finalize (GObject *object)
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{
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MetaGestureTrackerPrivate *priv;
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priv = meta_gesture_tracker_get_instance_private (META_GESTURE_TRACKER (object));
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g_hash_table_destroy (priv->sequences);
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g_array_free (priv->stage_gestures, TRUE);
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g_list_free (priv->listeners);
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G_OBJECT_CLASS (meta_gesture_tracker_parent_class)->finalize (object);
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}
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static void
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meta_gesture_tracker_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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MetaGestureTrackerPrivate *priv;
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priv = meta_gesture_tracker_get_instance_private (META_GESTURE_TRACKER (object));
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switch (prop_id)
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{
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case PROP_AUTODENY_TIMEOUT:
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priv->autodeny_timeout = g_value_get_uint (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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meta_gesture_tracker_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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MetaGestureTrackerPrivate *priv;
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priv = meta_gesture_tracker_get_instance_private (META_GESTURE_TRACKER (object));
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switch (prop_id)
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{
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case PROP_AUTODENY_TIMEOUT:
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g_value_set_uint (value, priv->autodeny_timeout);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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meta_gesture_tracker_class_init (MetaGestureTrackerClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->finalize = meta_gesture_tracker_finalize;
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object_class->set_property = meta_gesture_tracker_set_property;
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object_class->get_property = meta_gesture_tracker_get_property;
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obj_props[PROP_AUTODENY_TIMEOUT] = g_param_spec_uint ("autodeny-timeout",
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"Auto-deny timeout",
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"Auto-deny timeout",
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0, G_MAXUINT, DEFAULT_AUTODENY_TIMEOUT,
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G_PARAM_STATIC_STRINGS |
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT_ONLY);
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g_object_class_install_properties (object_class, LAST_PROP, obj_props);
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signals[STATE_CHANGED] =
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g_signal_new ("state-changed",
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (MetaGestureTrackerClass, state_changed),
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NULL, NULL, NULL,
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G_TYPE_NONE, 2, G_TYPE_POINTER, G_TYPE_UINT);
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}
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static gboolean
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autodeny_sequence (gpointer user_data)
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{
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MetaSequenceInfo *info = user_data;
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/* Deny the sequence automatically after the given timeout */
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if (info->state == META_SEQUENCE_NONE)
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meta_gesture_tracker_set_sequence_state (info->tracker, info->sequence,
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META_SEQUENCE_REJECTED);
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info->autodeny_timeout_id = 0;
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return G_SOURCE_REMOVE;
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}
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static MetaSequenceInfo *
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meta_sequence_info_new (MetaGestureTracker *tracker,
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const ClutterEvent *event)
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{
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MetaGestureTrackerPrivate *priv;
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MetaSequenceInfo *info;
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guint ms;
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priv = meta_gesture_tracker_get_instance_private (tracker);
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ms = priv->autodeny_timeout;
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info = g_slice_new0 (MetaSequenceInfo);
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info->tracker = tracker;
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info->sequence = event->touch.sequence;
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info->state = META_SEQUENCE_NONE;
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info->autodeny_timeout_id = g_timeout_add (ms, autodeny_sequence, info);
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return info;
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}
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static void
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meta_sequence_info_free (MetaSequenceInfo *info)
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{
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if (info->autodeny_timeout_id)
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g_source_remove (info->autodeny_timeout_id);
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if (info->state == META_SEQUENCE_NONE)
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meta_gesture_tracker_set_sequence_state (info->tracker, info->sequence,
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META_SEQUENCE_REJECTED);
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g_slice_free (MetaSequenceInfo, info);
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}
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static gboolean
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state_is_applicable (MetaSequenceState prev_state,
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MetaSequenceState state)
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{
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if (prev_state == META_SEQUENCE_PENDING_END)
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return FALSE;
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/* Don't allow reverting to none */
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if (state == META_SEQUENCE_NONE)
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return FALSE;
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/* PENDING_END state is final */
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if (prev_state == META_SEQUENCE_PENDING_END)
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return FALSE;
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/* Sequences must be accepted/denied before PENDING_END */
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if (prev_state == META_SEQUENCE_NONE &&
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state == META_SEQUENCE_PENDING_END)
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return FALSE;
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/* Make sequences stick to their accepted/denied state */
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if (state != META_SEQUENCE_PENDING_END &&
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prev_state != META_SEQUENCE_NONE)
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return FALSE;
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return TRUE;
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}
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static gboolean
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meta_gesture_tracker_set_state (MetaGestureTracker *tracker,
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MetaSequenceState state)
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{
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MetaGestureTrackerPrivate *priv;
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ClutterEventSequence *sequence;
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GHashTableIter iter;
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priv = meta_gesture_tracker_get_instance_private (tracker);
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if (priv->stage_state != state &&
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!state_is_applicable (priv->stage_state, state))
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return FALSE;
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g_hash_table_iter_init (&iter, priv->sequences);
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priv->stage_state = state;
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while (g_hash_table_iter_next (&iter, (gpointer*) &sequence, NULL))
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meta_gesture_tracker_set_sequence_state (tracker, sequence, state);
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return TRUE;
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}
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static gboolean
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gesture_begin_cb (ClutterGestureAction *gesture,
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ClutterActor *actor,
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MetaGestureTracker *tracker)
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{
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MetaGestureTrackerPrivate *priv;
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priv = meta_gesture_tracker_get_instance_private (tracker);
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if (!g_list_find (priv->listeners, gesture) &&
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meta_gesture_tracker_set_state (tracker, META_SEQUENCE_ACCEPTED))
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priv->listeners = g_list_prepend (priv->listeners, gesture);
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return TRUE;
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}
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static void
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gesture_end_cb (ClutterGestureAction *gesture,
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ClutterActor *actor,
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MetaGestureTracker *tracker)
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{
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MetaGestureTrackerPrivate *priv;
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priv = meta_gesture_tracker_get_instance_private (tracker);
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priv->listeners = g_list_remove (priv->listeners, gesture);
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if (!priv->listeners)
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meta_gesture_tracker_untrack_stage (tracker);
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}
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static void
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gesture_cancel_cb (ClutterGestureAction *gesture,
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ClutterActor *actor,
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MetaGestureTracker *tracker)
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{
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MetaGestureTrackerPrivate *priv;
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priv = meta_gesture_tracker_get_instance_private (tracker);
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if (g_list_find (priv->listeners, gesture))
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{
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priv->listeners = g_list_remove (priv->listeners, gesture);
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if (!priv->listeners)
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meta_gesture_tracker_set_state (tracker, META_SEQUENCE_PENDING_END);
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}
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}
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static gboolean
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cancel_and_unref_gesture_cb (ClutterGestureAction *action)
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{
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clutter_gesture_action_cancel (action);
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g_object_unref (action);
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return G_SOURCE_REMOVE;
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}
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static void
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clear_gesture_data (GestureActionData *data)
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{
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g_signal_handler_disconnect (data->gesture, data->gesture_begin_id);
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g_signal_handler_disconnect (data->gesture, data->gesture_end_id);
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g_signal_handler_disconnect (data->gesture, data->gesture_cancel_id);
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/* Defer cancellation to an idle, as it may happen within event handling */
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g_idle_add ((GSourceFunc) cancel_and_unref_gesture_cb, data->gesture);
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}
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static void
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meta_gesture_tracker_init (MetaGestureTracker *tracker)
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{
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MetaGestureTrackerPrivate *priv;
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priv = meta_gesture_tracker_get_instance_private (tracker);
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priv->sequences = g_hash_table_new_full (NULL, NULL, NULL,
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(GDestroyNotify) meta_sequence_info_free);
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priv->stage_gestures = g_array_new (FALSE, FALSE, sizeof (GestureActionData));
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g_array_set_clear_func (priv->stage_gestures, (GDestroyNotify) clear_gesture_data);
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}
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MetaGestureTracker *
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meta_gesture_tracker_new (guint autodeny_timeout)
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{
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return g_object_new (META_TYPE_GESTURE_TRACKER,
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"autodeny-timeout", autodeny_timeout,
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NULL);
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}
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static void
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meta_gesture_tracker_track_stage (MetaGestureTracker *tracker,
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ClutterActor *stage)
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{
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MetaGestureTrackerPrivate *priv;
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GList *actions, *l;
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priv = meta_gesture_tracker_get_instance_private (tracker);
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actions = clutter_actor_get_actions (stage);
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for (l = actions; l; l = l->next)
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{
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GestureActionData data;
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if (!CLUTTER_IS_GESTURE_ACTION (l->data))
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continue;
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data.gesture = g_object_ref (l->data);
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data.state = META_SEQUENCE_NONE;
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data.gesture_begin_id =
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g_signal_connect (data.gesture, "gesture-begin",
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G_CALLBACK (gesture_begin_cb), tracker);
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data.gesture_end_id =
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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));
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user