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event-controller: Add SugarTouchController

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This is a base class for gesture recognizers using possibly more
than a single touch.

Signed-off-by: Carlos Garnacho <carlos@lanedo.com>
Acked-by: Simon Schampijer <simon@laptop.org>
This commit is contained in:
Carlos Garnacho 2012-09-13 14:33:24 +02:00 committed by Simon Schampijer
parent 1ecc0f5e1d
commit 1ba68fa120
3 changed files with 380 additions and 0 deletions
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2
src/sugar3/event-controller/Makefile.am
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@ -16,6 +16,7 @@ eventcontroller_h_sources = \
sugar-long-press-controller.h \ sugar-long-press-controller.h \
sugar-rotate-controller.h \ sugar-rotate-controller.h \
sugar-swipe-controller.h \ sugar-swipe-controller.h \
sugar-touch-controller.h \
sugar-zoom-controller.h sugar-zoom-controller.h
eventcontroller_c_sources = \ eventcontroller_c_sources = \
@ -23,6 +24,7 @@ eventcontroller_c_sources = \
sugar-long-press-controller.c \ sugar-long-press-controller.c \
sugar-rotate-controller.c \ sugar-rotate-controller.c \
sugar-swipe-controller.c \ sugar-swipe-controller.c \
sugar-touch-controller.c \
sugar-zoom-controller.c sugar-zoom-controller.c

309
src/sugar3/event-controller/sugar-touch-controller.c Normal file
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@ -0,0 +1,309 @@
/*
* Copyright (C) 2012, One Laptop Per Child.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author(s): Carlos Garnacho <carlos@lanedo.com>
*/
#include "sugar-touch-controller.h"
#define TOUCHES_IN_RANGE(t,p) ((t) >= (p)->min_touches && (t) <= (p)->max_touches)
typedef struct _SugarTouchControllerPriv SugarTouchControllerPriv;
typedef struct _SugarTouch SugarTouch;
enum {
PROP_MIN_TOUCHES = 1,
PROP_MAX_TOUCHES
};
struct _SugarTouchControllerPriv
{
GHashTable *touches;
gint min_touches;
gint max_touches;
};
G_DEFINE_ABSTRACT_TYPE (SugarTouchController, sugar_touch_controller,
SUGAR_TYPE_EVENT_CONTROLLER)
static void
sugar_touch_controller_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
SugarTouchControllerPriv *priv;
priv = SUGAR_TOUCH_CONTROLLER (object)->_priv;
switch (prop_id)
{
case PROP_MIN_TOUCHES:
g_value_set_int (value, priv->min_touches);
break;
case PROP_MAX_TOUCHES:
g_value_set_int (value, priv->max_touches);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
sugar_touch_controller_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
SugarTouchControllerPriv *priv;
priv = SUGAR_TOUCH_CONTROLLER (object)->_priv;
switch (prop_id)
{
case PROP_MIN_TOUCHES:
priv->min_touches = g_value_get_int (value);
break;
case PROP_MAX_TOUCHES:
priv->max_touches = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
sugar_touch_controller_finalize (GObject *object)
{
SugarTouchControllerPriv *priv;
priv = SUGAR_TOUCH_CONTROLLER (object)->_priv;
g_hash_table_destroy (priv->touches);
G_OBJECT_CLASS (sugar_touch_controller_parent_class)->finalize (object);
}
static gboolean
sugar_touch_controller_handle_event (SugarEventController *controller,
GdkEvent *event)
{
SugarTouchControllerPriv *priv;
GdkEventSequence *sequence;
gboolean handled = TRUE;
GdkPoint *point;
gint n_touches, prev_n_touches;
gboolean is_in_range, was_in_range;
priv = SUGAR_TOUCH_CONTROLLER (controller)->_priv;
sequence = gdk_event_get_event_sequence (event);
prev_n_touches = g_hash_table_size (priv->touches);
was_in_range = TOUCHES_IN_RANGE (prev_n_touches, priv);
if (!sequence)
return FALSE;
switch (event->type)
{
case GDK_TOUCH_BEGIN:
point = g_new0 (GdkPoint, 1);
point->x = event->touch.x;
point->y = event->touch.y;
g_hash_table_insert (priv->touches, sequence, point);
break;
case GDK_TOUCH_END:
g_hash_table_remove (priv->touches, sequence);
break;
case GDK_TOUCH_UPDATE:
point = g_hash_table_lookup (priv->touches, sequence);
point->x = event->touch.x;
point->y = event->touch.y;
break;
default:
handled = FALSE;
}
n_touches = g_hash_table_size (priv->touches);
is_in_range = TOUCHES_IN_RANGE (n_touches, priv);
if (handled)
{
if (is_in_range)
{
if (!was_in_range)
g_signal_emit_by_name (controller, "began");
else
g_signal_emit_by_name (controller, "updated");
}
else if (was_in_range)
g_signal_emit_by_name (controller, "ended");
}
return handled;
}
static void
sugar_touch_controller_reset (SugarEventController *controller)
{
SugarTouchControllerPriv *priv;
gint n_touches;
priv = SUGAR_TOUCH_CONTROLLER (controller)->_priv;
n_touches = g_hash_table_size (priv->touches);
if (TOUCHES_IN_RANGE (n_touches, priv))
g_signal_emit_by_name (G_OBJECT (controller), "ended");
g_hash_table_remove_all (priv->touches);
g_object_notify (G_OBJECT (controller), "state");
}
static void
sugar_touch_controller_class_init (SugarTouchControllerClass *klass)
{
SugarEventControllerClass *controller_class = SUGAR_EVENT_CONTROLLER_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
controller_class->handle_event = sugar_touch_controller_handle_event;
controller_class->reset = sugar_touch_controller_reset;
object_class->get_property = sugar_touch_controller_get_property;
object_class->set_property = sugar_touch_controller_set_property;
object_class->finalize = sugar_touch_controller_finalize;
g_object_class_install_property (object_class,
PROP_MIN_TOUCHES,
g_param_spec_int ("min-touches",
"Minimum number of touches",
"Minimum Number of touches",
1, G_MAXINT, 1,
G_PARAM_CONSTRUCT |
G_PARAM_READWRITE |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_NICK |
G_PARAM_STATIC_BLURB));
g_object_class_install_property (object_class,
PROP_MAX_TOUCHES,
g_param_spec_int ("max-touches",
"Maximum number of touches",
"Maximum Number of touches",
1, G_MAXINT, 1,
G_PARAM_CONSTRUCT |
G_PARAM_READWRITE |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_NICK |
G_PARAM_STATIC_BLURB));
g_type_class_add_private (object_class, sizeof (SugarTouchControllerPriv));
}
static void
sugar_touch_controller_init (SugarTouchController *controller)
{
SugarTouchControllerPriv *priv;
controller->_priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (controller,
SUGAR_TYPE_TOUCH_CONTROLLER,
SugarTouchControllerPriv);
priv->touches = g_hash_table_new_full (NULL, NULL, NULL,
(GDestroyNotify) g_free);
}
gboolean
sugar_touch_controller_get_center (SugarTouchController *controller,
gint *center_x,
gint *center_y)
{
SugarTouchControllerPriv *priv;
GHashTableIter iter;
GdkPoint *point;
gint x1, y1, x2, y2, dx, dy;
g_return_val_if_fail (SUGAR_IS_TOUCH_CONTROLLER (controller), FALSE);
priv = controller->_priv;
g_hash_table_iter_init (&iter, priv->touches);
while (g_hash_table_iter_next (&iter, NULL, (gpointer *) &point))
{
x1 = MIN (x1, point->x);
y1 = MIN (y1, point->y);
x2 = MAX (x2, point->x);
y2 = MAX (y2, point->x);
}
if (center_x)
{
dx = x2 - x1;
*center_x = x1 + (ABS (dx) / 2);
}
if (center_y)
{
dy = y2 - y1;
*center_y = y1 + (ABS (dy) / 2);
}
}
gint
sugar_touch_controller_get_num_touches (SugarTouchController *controller)
{
SugarTouchControllerPriv *priv;
g_return_val_if_fail (SUGAR_IS_TOUCH_CONTROLLER (controller), 0);
priv = controller->_priv;
return g_hash_table_size (priv->touches);
}
GList *
sugar_touch_controller_get_sequences (SugarTouchController *controller)
{
SugarTouchControllerPriv *priv;
g_return_val_if_fail (SUGAR_IS_TOUCH_CONTROLLER (controller), NULL);
priv = controller->_priv;
return g_hash_table_get_keys (priv->touches);
}
gboolean
sugar_touch_controller_get_coords (SugarTouchController *controller,
GdkEventSequence *sequence,
gint *x,
gint *y)
{
SugarTouchControllerPriv *priv;
GdkPoint *point;
g_return_val_if_fail (SUGAR_IS_TOUCH_CONTROLLER (controller), FALSE);
g_return_val_if_fail (sequence != NULL, FALSE);
priv = controller->_priv;
point = g_hash_table_lookup (priv->touches, sequence);
if (!point)
return FALSE;
if (x)
*x = point->x;
if (y)
*y = point->y;
return TRUE;
}

69
src/sugar3/event-controller/sugar-touch-controller.h Normal file
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@ -0,0 +1,69 @@
/*
* Copyright (C) 2012, One Laptop Per Child.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author(s): Carlos Garnacho <carlos@lanedo.com>
*/
#if !defined (__SUGAR_CONTROLLERS_H_INSIDE__) && !defined (SUGAR_TOOLKIT_COMPILATION)
#error "Only <sugar/event-controller/sugar-event-controllers.h> can be included directly."
#endif
#ifndef __SUGAR_TOUCH_CONTROLLER_H__
#define __SUGAR_TOUCH_CONTROLLER_H__
#include "sugar-event-controller.h"
#include <gtk/gtk.h>
G_BEGIN_DECLS
#define SUGAR_TYPE_TOUCH_CONTROLLER (sugar_touch_controller_get_type ())
#define SUGAR_TOUCH_CONTROLLER(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), SUGAR_TYPE_TOUCH_CONTROLLER, SugarTouchController))
#define SUGAR_TOUCH_CONTROLLER_CLASS(k) (G_TYPE_CHECK_CLASS_CAST ((k), SUGAR_TYPE_TOUCH_CONTROLLER, SugarTouchControllerClass))
#define SUGAR_IS_TOUCH_CONTROLLER(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), SUGAR_TYPE_TOUCH_CONTROLLER))
#define SUGAR_IS_TOUCH_CONTROLLER_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), SUGAR_TYPE_TOUCH_CONTROLLER))
#define SUGAR_TOUCH_CONTROLLER_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), SUGAR_TYPE_TOUCH_CONTROLLER, SugarTouchControllerClass))
typedef struct _SugarTouchController SugarTouchController;
typedef struct _SugarTouchControllerClass SugarTouchControllerClass;
struct _SugarTouchController
{
SugarEventController parent_instance;
gpointer _priv;
};
struct _SugarTouchControllerClass
{
SugarEventControllerClass parent_class;
};
GType sugar_touch_controller_get_type (void) G_GNUC_CONST;
gboolean sugar_touch_controller_get_center (SugarTouchController *controller,
gint *x,
gint *y);
gint sugar_touch_controller_get_num_touches (SugarTouchController *controller);
GList * sugar_touch_controller_get_sequences (SugarTouchController *controller);
gboolean sugar_touch_controller_get_coords (SugarTouchController *controller,
GdkEventSequence *sequence,
gint *x,
gint *y);
G_END_DECLS
#endif /* __SUGAR_TOUCH_CONTROLLER_H__ */