event-controller: Add SugarTouchController
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>master
Carlos Garnacho
12 years ago
committed by
Simon Schampijer
parent
1ecc0f5e1d
commit
1ba68fa120
@ -0,0 +1,309 @@
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/*
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* Copyright (C) 2012, One Laptop Per Child.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Author(s): Carlos Garnacho <carlos@lanedo.com>
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*/
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#include "sugar-touch-controller.h"
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#define TOUCHES_IN_RANGE(t,p) ((t) >= (p)->min_touches && (t) <= (p)->max_touches)
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typedef struct _SugarTouchControllerPriv SugarTouchControllerPriv;
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typedef struct _SugarTouch SugarTouch;
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enum {
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PROP_MIN_TOUCHES = 1,
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PROP_MAX_TOUCHES
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};
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struct _SugarTouchControllerPriv
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{
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GHashTable *touches;
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gint min_touches;
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gint max_touches;
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};
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G_DEFINE_ABSTRACT_TYPE (SugarTouchController, sugar_touch_controller,
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SUGAR_TYPE_EVENT_CONTROLLER)
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static void
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sugar_touch_controller_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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SugarTouchControllerPriv *priv;
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priv = SUGAR_TOUCH_CONTROLLER (object)->_priv;
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switch (prop_id)
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{
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case PROP_MIN_TOUCHES:
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g_value_set_int (value, priv->min_touches);
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break;
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case PROP_MAX_TOUCHES:
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g_value_set_int (value, priv->max_touches);
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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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}
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}
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static void
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sugar_touch_controller_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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SugarTouchControllerPriv *priv;
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priv = SUGAR_TOUCH_CONTROLLER (object)->_priv;
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switch (prop_id)
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{
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case PROP_MIN_TOUCHES:
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priv->min_touches = g_value_get_int (value);
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break;
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case PROP_MAX_TOUCHES:
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priv->max_touches = g_value_get_int (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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}
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}
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static void
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sugar_touch_controller_finalize (GObject *object)
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{
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SugarTouchControllerPriv *priv;
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priv = SUGAR_TOUCH_CONTROLLER (object)->_priv;
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g_hash_table_destroy (priv->touches);
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G_OBJECT_CLASS (sugar_touch_controller_parent_class)->finalize (object);
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}
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static gboolean
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sugar_touch_controller_handle_event (SugarEventController *controller,
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GdkEvent *event)
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{
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SugarTouchControllerPriv *priv;
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GdkEventSequence *sequence;
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gboolean handled = TRUE;
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GdkPoint *point;
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gint n_touches, prev_n_touches;
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gboolean is_in_range, was_in_range;
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priv = SUGAR_TOUCH_CONTROLLER (controller)->_priv;
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sequence = gdk_event_get_event_sequence (event);
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prev_n_touches = g_hash_table_size (priv->touches);
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was_in_range = TOUCHES_IN_RANGE (prev_n_touches, priv);
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if (!sequence)
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return FALSE;
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switch (event->type)
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{
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case GDK_TOUCH_BEGIN:
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point = g_new0 (GdkPoint, 1);
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point->x = event->touch.x;
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point->y = event->touch.y;
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g_hash_table_insert (priv->touches, sequence, point);
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break;
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case GDK_TOUCH_END:
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g_hash_table_remove (priv->touches, sequence);
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break;
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case GDK_TOUCH_UPDATE:
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point = g_hash_table_lookup (priv->touches, sequence);
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point->x = event->touch.x;
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point->y = event->touch.y;
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break;
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default:
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handled = FALSE;
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}
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n_touches = g_hash_table_size (priv->touches);
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is_in_range = TOUCHES_IN_RANGE (n_touches, priv);
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if (handled)
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{
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if (is_in_range)
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{
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if (!was_in_range)
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g_signal_emit_by_name (controller, "began");
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else
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g_signal_emit_by_name (controller, "updated");
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}
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else if (was_in_range)
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g_signal_emit_by_name (controller, "ended");
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}
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return handled;
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}
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static void
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sugar_touch_controller_reset (SugarEventController *controller)
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{
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SugarTouchControllerPriv *priv;
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gint n_touches;
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priv = SUGAR_TOUCH_CONTROLLER (controller)->_priv;
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n_touches = g_hash_table_size (priv->touches);
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if (TOUCHES_IN_RANGE (n_touches, priv))
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g_signal_emit_by_name (G_OBJECT (controller), "ended");
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g_hash_table_remove_all (priv->touches);
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g_object_notify (G_OBJECT (controller), "state");
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}
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static void
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sugar_touch_controller_class_init (SugarTouchControllerClass *klass)
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{
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SugarEventControllerClass *controller_class = SUGAR_EVENT_CONTROLLER_CLASS (klass);
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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controller_class->handle_event = sugar_touch_controller_handle_event;
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controller_class->reset = sugar_touch_controller_reset;
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object_class->get_property = sugar_touch_controller_get_property;
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object_class->set_property = sugar_touch_controller_set_property;
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object_class->finalize = sugar_touch_controller_finalize;
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g_object_class_install_property (object_class,
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PROP_MIN_TOUCHES,
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g_param_spec_int ("min-touches",
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"Minimum number of touches",
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"Minimum Number of touches",
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1, G_MAXINT, 1,
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G_PARAM_CONSTRUCT |
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G_PARAM_READWRITE |
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G_PARAM_STATIC_NAME |
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G_PARAM_STATIC_NICK |
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G_PARAM_STATIC_BLURB));
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g_object_class_install_property (object_class,
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PROP_MAX_TOUCHES,
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g_param_spec_int ("max-touches",
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"Maximum number of touches",
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"Maximum Number of touches",
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1, G_MAXINT, 1,
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G_PARAM_CONSTRUCT |
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G_PARAM_READWRITE |
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G_PARAM_STATIC_NAME |
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G_PARAM_STATIC_NICK |
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G_PARAM_STATIC_BLURB));
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g_type_class_add_private (object_class, sizeof (SugarTouchControllerPriv));
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}
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static void
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sugar_touch_controller_init (SugarTouchController *controller)
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{
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SugarTouchControllerPriv *priv;
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controller->_priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (controller,
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SUGAR_TYPE_TOUCH_CONTROLLER,
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SugarTouchControllerPriv);
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priv->touches = g_hash_table_new_full (NULL, NULL, NULL,
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(GDestroyNotify) g_free);
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}
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gboolean
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sugar_touch_controller_get_center (SugarTouchController *controller,
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gint *center_x,
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gint *center_y)
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{
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SugarTouchControllerPriv *priv;
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GHashTableIter iter;
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GdkPoint *point;
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gint x1, y1, x2, y2, dx, dy;
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g_return_val_if_fail (SUGAR_IS_TOUCH_CONTROLLER (controller), FALSE);
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priv = controller->_priv;
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g_hash_table_iter_init (&iter, priv->touches);
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while (g_hash_table_iter_next (&iter, NULL, (gpointer *) &point))
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{
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x1 = MIN (x1, point->x);
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y1 = MIN (y1, point->y);
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x2 = MAX (x2, point->x);
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y2 = MAX (y2, point->x);
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}
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if (center_x)
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{
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dx = x2 - x1;
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*center_x = x1 + (ABS (dx) / 2);
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}
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if (center_y)
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{
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dy = y2 - y1;
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*center_y = y1 + (ABS (dy) / 2);
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}
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}
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gint
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sugar_touch_controller_get_num_touches (SugarTouchController *controller)
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{
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SugarTouchControllerPriv *priv;
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g_return_val_if_fail (SUGAR_IS_TOUCH_CONTROLLER (controller), 0);
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priv = controller->_priv;
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return g_hash_table_size (priv->touches);
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}
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GList *
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sugar_touch_controller_get_sequences (SugarTouchController *controller)
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{
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SugarTouchControllerPriv *priv;
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g_return_val_if_fail (SUGAR_IS_TOUCH_CONTROLLER (controller), NULL);
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priv = controller->_priv;
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return g_hash_table_get_keys (priv->touches);
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}
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gboolean
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sugar_touch_controller_get_coords (SugarTouchController *controller,
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GdkEventSequence *sequence,
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gint *x,
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gint *y)
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{
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SugarTouchControllerPriv *priv;
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GdkPoint *point;
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g_return_val_if_fail (SUGAR_IS_TOUCH_CONTROLLER (controller), FALSE);
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g_return_val_if_fail (sequence != NULL, FALSE);
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priv = controller->_priv;
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point = g_hash_table_lookup (priv->touches, sequence);
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if (!point)
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return FALSE;
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if (x)
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*x = point->x;
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if (y)
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*y = point->y;
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return TRUE;
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}
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@ -0,0 +1,69 @@
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/*
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* Copyright (C) 2012, One Laptop Per Child.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Author(s): Carlos Garnacho <carlos@lanedo.com>
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*/
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#if !defined (__SUGAR_CONTROLLERS_H_INSIDE__) && !defined (SUGAR_TOOLKIT_COMPILATION)
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#error "Only <sugar/event-controller/sugar-event-controllers.h> can be included directly."
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#endif
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#ifndef __SUGAR_TOUCH_CONTROLLER_H__
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#define __SUGAR_TOUCH_CONTROLLER_H__
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#include "sugar-event-controller.h"
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#include <gtk/gtk.h>
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G_BEGIN_DECLS
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#define SUGAR_TYPE_TOUCH_CONTROLLER (sugar_touch_controller_get_type ())
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#define SUGAR_TOUCH_CONTROLLER(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), SUGAR_TYPE_TOUCH_CONTROLLER, SugarTouchController))
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#define SUGAR_TOUCH_CONTROLLER_CLASS(k) (G_TYPE_CHECK_CLASS_CAST ((k), SUGAR_TYPE_TOUCH_CONTROLLER, SugarTouchControllerClass))
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#define SUGAR_IS_TOUCH_CONTROLLER(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), SUGAR_TYPE_TOUCH_CONTROLLER))
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#define SUGAR_IS_TOUCH_CONTROLLER_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), SUGAR_TYPE_TOUCH_CONTROLLER))
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#define SUGAR_TOUCH_CONTROLLER_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), SUGAR_TYPE_TOUCH_CONTROLLER, SugarTouchControllerClass))
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typedef struct _SugarTouchController SugarTouchController;
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typedef struct _SugarTouchControllerClass SugarTouchControllerClass;
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struct _SugarTouchController
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{
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SugarEventController parent_instance;
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gpointer _priv;
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};
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struct _SugarTouchControllerClass
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{
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SugarEventControllerClass parent_class;
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};
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GType sugar_touch_controller_get_type (void) G_GNUC_CONST;
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gboolean sugar_touch_controller_get_center (SugarTouchController *controller,
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gint *x,
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gint *y);
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gint sugar_touch_controller_get_num_touches (SugarTouchController *controller);
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GList * sugar_touch_controller_get_sequences (SugarTouchController *controller);
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gboolean sugar_touch_controller_get_coords (SugarTouchController *controller,
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GdkEventSequence *sequence,
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gint *x,
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gint *y);
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G_END_DECLS
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#endif /* __SUGAR_TOUCH_CONTROLLER_H__ */
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