8f4474f3f5
Discussed and compared options with Gary.
333 lines
10 KiB
C
333 lines
10 KiB
C
/*
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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-long-press-controller.h"
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#define DEFAULT_THRESHOLD 32
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#define DEFAULT_TRIGGER_DELAY 600
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typedef struct _SugarLongPressControllerPriv SugarLongPressControllerPriv;
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enum {
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PROP_0,
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PROP_THRESHOLD,
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PROP_TRIGGER_DELAY
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};
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enum {
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PRESSED,
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N_SIGNALS
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};
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struct _SugarLongPressControllerPriv
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{
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GdkDevice *device;
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GdkEventSequence *sequence;
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gint64 start_time;
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gint x;
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gint y;
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gint root_x;
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gint root_y;
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guint timeout_id;
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guint threshold;
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guint delay;
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guint cancelled : 1;
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guint triggered : 1;
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};
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static guint signals[N_SIGNALS] = { 0 };
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G_DEFINE_TYPE (SugarLongPressController,
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sugar_long_press_controller,
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SUGAR_TYPE_EVENT_CONTROLLER)
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static void
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sugar_long_press_controller_init (SugarLongPressController *controller)
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{
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SugarLongPressControllerPriv *priv;
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controller->_priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (controller,
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SUGAR_TYPE_LONG_PRESS_CONTROLLER,
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SugarLongPressControllerPriv);
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priv->threshold = DEFAULT_THRESHOLD;
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priv->delay = DEFAULT_TRIGGER_DELAY;
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priv->x = priv->y = -1;
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priv->root_x = priv->root_y = -1;
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}
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static void
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_sugar_long_press_controller_unset_device (SugarLongPressController *controller)
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{
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SugarLongPressControllerPriv *priv = controller->_priv;
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if (priv->device)
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{
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g_object_unref (priv->device);
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priv->device = NULL;
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}
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priv->sequence = NULL;
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priv->x = priv->y = -1;
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priv->root_x = priv->root_y = -1;
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priv->cancelled = priv->triggered = FALSE;
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}
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static gboolean
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_sugar_long_press_controller_cancel (SugarLongPressController *controller)
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{
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SugarLongPressControllerPriv *priv = controller->_priv;
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if (priv->timeout_id)
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{
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g_source_remove (priv->timeout_id);
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priv->timeout_id = 0;
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priv->cancelled = TRUE;
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g_object_notify (G_OBJECT (controller), "state");
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return TRUE;
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}
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return FALSE;
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}
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static void
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sugar_long_press_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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SugarLongPressControllerPriv *priv = SUGAR_LONG_PRESS_CONTROLLER (object)->_priv;
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switch (prop_id)
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{
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case PROP_THRESHOLD:
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g_value_set_uint (value, priv->threshold);
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break;
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case PROP_TRIGGER_DELAY:
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g_value_set_uint (value, priv->delay);
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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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sugar_long_press_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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SugarLongPressControllerPriv *priv = SUGAR_LONG_PRESS_CONTROLLER (object)->_priv;
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switch (prop_id)
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{
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case PROP_THRESHOLD:
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priv->threshold = g_value_get_uint (value);
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break;
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case PROP_TRIGGER_DELAY:
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priv->delay = 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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sugar_long_press_controller_finalize (GObject *object)
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{
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SugarLongPressController *controller = SUGAR_LONG_PRESS_CONTROLLER (object);
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_sugar_long_press_controller_cancel (controller);
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_sugar_long_press_controller_unset_device (controller);
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G_OBJECT_CLASS (sugar_long_press_controller_parent_class)->finalize (object);
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}
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static gboolean
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_sugar_long_press_controller_timeout (gpointer user_data)
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{
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SugarLongPressController *controller = user_data;
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SugarLongPressControllerPriv *priv = controller->_priv;
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priv->timeout_id = 0;
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priv->triggered = TRUE;
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g_signal_emit_by_name (controller, "began");
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g_signal_emit (controller, signals[PRESSED], 0, priv->x, priv->y);
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return FALSE;
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}
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static SugarEventControllerState
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sugar_long_press_controller_get_state (SugarEventController *controller)
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{
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SugarLongPressControllerPriv *priv;
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priv = SUGAR_LONG_PRESS_CONTROLLER (controller)->_priv;
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if (priv->device)
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{
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if (priv->timeout_id)
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return SUGAR_EVENT_CONTROLLER_STATE_COLLECTING;
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else if (priv->cancelled)
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return SUGAR_EVENT_CONTROLLER_STATE_NOT_RECOGNIZED;
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else if (priv->triggered)
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return SUGAR_EVENT_CONTROLLER_STATE_RECOGNIZED;
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}
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return SUGAR_EVENT_CONTROLLER_STATE_NONE;
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}
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static void
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sugar_long_press_controller_reset (SugarEventController *controller)
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{
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SugarLongPressControllerPriv *priv;
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priv = SUGAR_LONG_PRESS_CONTROLLER (controller)->_priv;
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if (priv->triggered)
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g_signal_emit_by_name (controller, "ended");
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_sugar_long_press_controller_cancel (SUGAR_LONG_PRESS_CONTROLLER (controller));
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_sugar_long_press_controller_unset_device (SUGAR_LONG_PRESS_CONTROLLER (controller));
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g_object_notify (G_OBJECT (controller), "state");
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}
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static gboolean
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sugar_long_press_controller_handle_event (SugarEventController *controller,
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GdkEvent *event)
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{
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SugarLongPressControllerPriv *priv;
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GdkEventSequence *sequence;
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gboolean handled = TRUE;
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GdkDevice *device;
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priv = SUGAR_LONG_PRESS_CONTROLLER (controller)->_priv;
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device = gdk_event_get_device (event);
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sequence = gdk_event_get_event_sequence (event);
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if (priv->device)
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{
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if (priv->device != device)
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return FALSE;
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if (sequence && priv->sequence != sequence)
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{
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/* Another touch is simultaneously operating,
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* give up on recognizing a long press.
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*/
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_sugar_long_press_controller_cancel (SUGAR_LONG_PRESS_CONTROLLER (controller));
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return FALSE;
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}
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}
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switch (event->type)
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{
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case GDK_TOUCH_BEGIN:
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priv->device = g_object_ref (device);
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priv->start_time = g_get_monotonic_time ();
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priv->x = event->touch.x;
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priv->y = event->touch.y;
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priv->root_x = event->touch.x_root;
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priv->root_y = event->touch.y_root;
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priv->sequence = sequence;
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priv->timeout_id =
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gdk_threads_add_timeout (priv->delay,
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_sugar_long_press_controller_timeout,
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controller);
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g_object_notify (G_OBJECT (controller), "state");
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break;
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case GDK_TOUCH_UPDATE:
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if (ABS (priv->x - event->touch.x) > priv->threshold ||
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ABS (priv->y - event->touch.y) > priv->threshold)
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_sugar_long_press_controller_cancel (SUGAR_LONG_PRESS_CONTROLLER (controller));
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break;
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case GDK_TOUCH_END:
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sugar_event_controller_reset (controller);
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break;
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default:
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handled = FALSE;
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break;
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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_long_press_controller_class_init (SugarLongPressControllerClass *klass)
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{
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SugarEventControllerClass *controller_class;
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GObjectClass *object_class;
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object_class = G_OBJECT_CLASS (klass);
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object_class->get_property = sugar_long_press_controller_get_property;
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object_class->set_property = sugar_long_press_controller_set_property;
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object_class->finalize = sugar_long_press_controller_finalize;
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controller_class = SUGAR_EVENT_CONTROLLER_CLASS (klass);
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controller_class->handle_event = sugar_long_press_controller_handle_event;
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controller_class->get_state = sugar_long_press_controller_get_state;
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controller_class->reset = sugar_long_press_controller_reset;
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g_object_class_install_property (object_class,
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PROP_THRESHOLD,
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g_param_spec_uint ("threshold",
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"Threshold",
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"Threshold in pixels where the long "
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"press operation remains valid",
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0, G_MAXUINT, DEFAULT_THRESHOLD,
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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_TRIGGER_DELAY,
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g_param_spec_uint ("trigger-delay",
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"Trigger delay",
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"delay in milliseconds before the gesture is triggered",
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0, G_MAXUINT, DEFAULT_TRIGGER_DELAY,
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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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signals[PRESSED] =
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g_signal_new ("pressed",
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (SugarLongPressControllerClass, pressed),
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NULL, NULL,
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g_cclosure_marshal_generic,
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G_TYPE_NONE, 2,
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G_TYPE_INT, G_TYPE_INT);
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g_type_class_add_private (klass, sizeof (SugarLongPressControllerPriv));
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}
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SugarEventController *
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sugar_long_press_controller_new (void)
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{
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return g_object_new (SUGAR_TYPE_LONG_PRESS_CONTROLLER, NULL);
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}
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