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gesture-tracker: Implement threshold-based sequence rejection

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If a sequence moves past a certain distance without being used by a
gesture, reject it so clients may see and react to it ASAP. This makes
gestures to be began by initially quasi-static touchpoints, in addition to
quasi-simultaneous.
This commit is contained in:
Carlos Garnacho 2014-06-25 12:31:58 +02:00 committed by Jasper St. Pierre
parent d05b750b8d
commit 789608b637
1 changed files with 19 additions and 0 deletions
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19
src/core/gesture-tracker.c
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@ -23,6 +23,8 @@
#include "gesture-tracker-private.h"
#include "meta-surface-actor.h"
#define DISTANCE_THRESHOLD 30
typedef struct _MetaGestureTrackerPrivate MetaGestureTrackerPrivate;
typedef struct _GestureActionData GestureActionData;
typedef struct _MetaSequenceInfo MetaSequenceInfo;
@ -33,6 +35,8 @@ struct _MetaSequenceInfo
ClutterEventSequence *sequence;
MetaSequenceState state;
guint autodeny_timeout_id;
gfloat start_x;
gfloat start_y;
};
struct _GestureActionData
@ -190,6 +194,8 @@ meta_sequence_info_new (MetaGestureTracker *tracker,
info->state = META_SEQUENCE_NONE;
info->autodeny_timeout_id = g_timeout_add (ms, autodeny_sequence, info);
clutter_event_get_coords (event, &info->start_x, &info->start_y);
return info;
}
@ -402,6 +408,7 @@ meta_gesture_tracker_handle_event (MetaGestureTracker *tracker,
ClutterEventSequence *sequence;
MetaSequenceInfo *info;
ClutterActor *stage;
gfloat x, y;
sequence = clutter_event_get_event_sequence (event);
@ -452,6 +459,18 @@ meta_gesture_tracker_handle_event (MetaGestureTracker *tracker,
meta_gesture_tracker_untrack_stage (tracker);
break;
case CLUTTER_TOUCH_UPDATE:
info = g_hash_table_lookup (priv->sequences, sequence);
if (!info)
return FALSE;
clutter_event_get_coords (event, &x, &y);
if (info->state == META_SEQUENCE_NONE &&
(ABS (info->start_x - x) > DISTANCE_THRESHOLD ||
ABS (info->start_y - y) > DISTANCE_THRESHOLD))
meta_gesture_tracker_set_sequence_state (tracker, sequence,
META_SEQUENCE_REJECTED);
break;
default:
return FALSE;