504 lines
15 KiB
C
504 lines
15 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Copyright (C) 2010 Intel Corporation.
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* Copyright (C) 2011 Robert Bosch Car Multimedia GmbH.
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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, see <http://www.gnu.org/licenses/>.
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*
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* Author:
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* Tomeu Vizoso <tomeu.vizoso@collabora.co.uk>
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*/
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/**
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* SECTION:clutter-gesture-action
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* @Title: ClutterGestureAction
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* @Short_Description: Action for gesture gestures
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*
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* #ClutterGestureAction is a sub-class of #ClutterAction that implements
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* the logic for recognizing gesture gestures. It listens for low level events
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* such as #ClutterButtonEvent and #ClutterMotionEvent on the stage to raise
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* the #ClutterGestureAction::gesture-begin, #ClutterGestureAction::gesture-progress,
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* and * #ClutterGestureAction::gesture-end signals.
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*
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* To use #ClutterGestureAction you just need to apply it to a #ClutterActor
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* using clutter_actor_add_action() and connect to the signals:
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*
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* |[
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* ClutterAction *action = clutter_gesture_action_new ();
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*
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* clutter_actor_add_action (actor, action);
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*
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* g_signal_connect (action, "gesture-begin", G_CALLBACK (on_gesture_begin), NULL);
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* g_signal_connect (action, "gesture-progress", G_CALLBACK (on_gesture_progress), NULL);
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* g_signal_connect (action, "gesture-end", G_CALLBACK (on_gesture_end), NULL);
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* ]|
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*
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* Since: 1.8
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "clutter-gesture-action.h"
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#include "clutter-debug.h"
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#include "clutter-enum-types.h"
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#include "clutter-marshal.h"
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#include "clutter-private.h"
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struct _ClutterGestureActionPrivate
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{
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ClutterActor *stage;
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guint actor_capture_id;
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gulong stage_capture_id;
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gfloat press_x, press_y;
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gfloat last_motion_x, last_motion_y;
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gfloat release_x, release_y;
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guint in_drag : 1;
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};
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enum
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{
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GESTURE_BEGIN,
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GESTURE_PROGRESS,
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GESTURE_END,
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GESTURE_CANCEL,
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LAST_SIGNAL
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};
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static guint gesture_signals[LAST_SIGNAL] = { 0, };
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G_DEFINE_TYPE (ClutterGestureAction, clutter_gesture_action, CLUTTER_TYPE_ACTION);
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static gboolean
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signal_accumulator (GSignalInvocationHint *ihint,
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GValue *return_accu,
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const GValue *handler_return,
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gpointer user_data)
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{
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gboolean continue_emission;
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continue_emission = g_value_get_boolean (handler_return);
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g_value_set_boolean (return_accu, continue_emission);
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return continue_emission;
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}
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static void
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cancel_gesture (ClutterGestureAction *action)
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{
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ClutterGestureActionPrivate *priv = action->priv;
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ClutterActor *actor;
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priv->in_drag = FALSE;
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g_signal_handler_disconnect (priv->stage, priv->stage_capture_id);
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priv->stage_capture_id = 0;
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actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (action));
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g_signal_emit (action, gesture_signals[GESTURE_CANCEL], 0, actor);
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}
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static gboolean
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stage_captured_event_cb (ClutterActor *stage,
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ClutterEvent *event,
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ClutterGestureAction *action)
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{
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ClutterGestureActionPrivate *priv = action->priv;
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ClutterActor *actor;
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gboolean return_value;
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actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (action));
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switch (clutter_event_type (event))
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{
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case CLUTTER_MOTION:
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{
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ClutterModifierType mods = clutter_event_get_state (event);
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/* we might miss a button-release event in case of grabs,
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* so we need to check whether the button is still down
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* during a motion event
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*/
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if (!(mods & CLUTTER_BUTTON1_MASK))
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{
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cancel_gesture (action);
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return FALSE;
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}
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clutter_event_get_coords (event, &priv->last_motion_x,
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&priv->last_motion_y);
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if (!clutter_actor_transform_stage_point (actor,
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priv->last_motion_x,
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priv->last_motion_y,
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NULL, NULL))
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return FALSE;
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if (!priv->in_drag)
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{
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gint drag_threshold;
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ClutterSettings *settings = clutter_settings_get_default ();
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g_object_get (settings,
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"dnd-drag-threshold", &drag_threshold,
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NULL);
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if ((ABS (priv->press_y - priv->last_motion_y) >= drag_threshold) ||
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(ABS (priv->press_x - priv->last_motion_x) >= drag_threshold))
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{
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priv->in_drag = TRUE;
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g_signal_emit (action, gesture_signals[GESTURE_BEGIN], 0, actor,
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&return_value);
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if (!return_value)
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{
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cancel_gesture (action);
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return FALSE;
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}
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}
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else
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return FALSE;
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}
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g_signal_emit (action, gesture_signals[GESTURE_PROGRESS], 0, actor,
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&return_value);
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if (!return_value)
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{
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cancel_gesture (action);
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return FALSE;
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}
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}
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break;
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case CLUTTER_BUTTON_RELEASE:
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{
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clutter_event_get_coords (event, &priv->release_x, &priv->release_y);
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g_signal_handler_disconnect (priv->stage, priv->stage_capture_id);
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priv->stage_capture_id = 0;
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if (priv->in_drag)
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{
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priv->in_drag = FALSE;
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g_signal_emit (action, gesture_signals[GESTURE_END], 0, actor);
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}
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}
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break;
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default:
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break;
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}
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return FALSE;
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}
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static gboolean
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actor_captured_event_cb (ClutterActor *actor,
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ClutterEvent *event,
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ClutterGestureAction *action)
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{
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ClutterGestureActionPrivate *priv = action->priv;
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if (clutter_event_type (event) != CLUTTER_BUTTON_PRESS)
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return FALSE;
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if (!clutter_actor_meta_get_enabled (CLUTTER_ACTOR_META (action)))
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return FALSE;
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clutter_event_get_coords (event, &priv->press_x, &priv->press_y);
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if (priv->stage == NULL)
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priv->stage = clutter_actor_get_stage (actor);
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priv->stage_capture_id =
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g_signal_connect_after (priv->stage, "captured-event",
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G_CALLBACK (stage_captured_event_cb),
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action);
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return FALSE;
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}
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static void
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clutter_gesture_action_set_actor (ClutterActorMeta *meta,
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ClutterActor *actor)
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{
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ClutterGestureActionPrivate *priv = CLUTTER_GESTURE_ACTION (meta)->priv;
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ClutterActorMetaClass *meta_class =
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CLUTTER_ACTOR_META_CLASS (clutter_gesture_action_parent_class);
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if (priv->actor_capture_id != 0)
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{
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ClutterActor *old_actor = clutter_actor_meta_get_actor (meta);
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g_signal_handler_disconnect (old_actor, priv->actor_capture_id);
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priv->actor_capture_id = 0;
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}
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if (priv->stage_capture_id != 0)
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{
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g_signal_handler_disconnect (priv->stage, priv->stage_capture_id);
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priv->stage_capture_id = 0;
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priv->stage = NULL;
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}
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if (actor != NULL)
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{
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priv->actor_capture_id =
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g_signal_connect (actor, "captured-event",
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G_CALLBACK (actor_captured_event_cb),
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meta);
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}
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meta_class->set_actor (meta, actor);
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}
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static gboolean
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default_event_handler (ClutterGestureAction *action,
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ClutterActor *actor)
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{
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return TRUE;
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}
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static void
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clutter_gesture_action_class_init (ClutterGestureActionClass *klass)
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{
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ClutterActorMetaClass *meta_class = CLUTTER_ACTOR_META_CLASS (klass);
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g_type_class_add_private (klass, sizeof (ClutterGestureActionPrivate));
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meta_class->set_actor = clutter_gesture_action_set_actor;
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klass->gesture_begin = default_event_handler;
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klass->gesture_progress = default_event_handler;
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/**
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* ClutterGestureAction::gesture-begin:
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* @action: the #ClutterGestureAction that emitted the signal
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* @actor: the #ClutterActor attached to the @action
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*
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* The ::gesture_begin signal is emitted when the #ClutterActor to which
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* a #ClutterGestureAction has been applied starts receiving a gesture.
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*
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* Return value: %TRUE if the gesture should start, and %FALSE if
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* the gesture should be ignored.
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*
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* Since: 1.8
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*/
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gesture_signals[GESTURE_BEGIN] =
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g_signal_new (I_("gesture-begin"),
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (ClutterGestureActionClass, gesture_begin),
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signal_accumulator, NULL,
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_clutter_marshal_BOOLEAN__OBJECT,
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G_TYPE_BOOLEAN, 1,
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CLUTTER_TYPE_ACTOR);
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/**
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* ClutterGestureAction::gesture-progress:
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* @action: the #ClutterGestureAction that emitted the signal
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* @actor: the #ClutterActor attached to the @action
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*
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* The ::gesture-progress signal is emitted for each motion event after
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* the #ClutterGestureAction::gesture-begin signal has been emitted.
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*
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* Return value: %TRUE if the gesture should continue, and %FALSE if
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* the gesture should be cancelled.
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*
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* Since: 1.8
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*/
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gesture_signals[GESTURE_PROGRESS] =
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g_signal_new (I_("gesture-progress"),
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (ClutterGestureActionClass, gesture_progress),
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signal_accumulator, NULL,
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_clutter_marshal_BOOLEAN__OBJECT,
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G_TYPE_BOOLEAN, 1,
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CLUTTER_TYPE_ACTOR);
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/**
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* ClutterGestureAction::gesture-end:
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* @action: the #ClutterGestureAction that emitted the signal
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* @actor: the #ClutterActor attached to the @action
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*
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* The ::gesture-end signal is emitted at the end of the gesture gesture,
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* when the pointer's button is released
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*
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* This signal is emitted if and only if the #ClutterGestureAction::gesture-begin
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* signal has been emitted first.
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*
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* Since: 1.8
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*/
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gesture_signals[GESTURE_END] =
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g_signal_new (I_("gesture-end"),
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (ClutterGestureActionClass, gesture_end),
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NULL, NULL,
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_clutter_marshal_VOID__OBJECT,
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G_TYPE_NONE, 1,
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CLUTTER_TYPE_ACTOR);
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/**
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* ClutterGestureAction::gesture-cancel:
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* @action: the #ClutterGestureAction that emitted the signal
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* @actor: the #ClutterActor attached to the @action
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*
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* The ::gesture-cancel signal is emitted when the ongoing gesture gets
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* cancelled from the #ClutterGestureAction::gesture-progress signal handler.
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*
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* This signal is emitted if and only if the #ClutterGestureAction::gesture-begin
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* signal has been emitted first.
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*
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* Since: 1.8
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*/
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gesture_signals[GESTURE_CANCEL] =
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g_signal_new (I_("gesture-cancel"),
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (ClutterGestureActionClass, gesture_cancel),
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NULL, NULL,
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_clutter_marshal_VOID__OBJECT,
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G_TYPE_NONE, 1,
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CLUTTER_TYPE_ACTOR);
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}
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static void
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clutter_gesture_action_init (ClutterGestureAction *self)
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{
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self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, CLUTTER_TYPE_GESTURE_ACTION,
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ClutterGestureActionPrivate);
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self->priv->press_x = self->priv->press_y = 0.f;
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self->priv->last_motion_x = self->priv->last_motion_y = 0.f;
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self->priv->release_x = self->priv->release_y = 0.f;
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}
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/**
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* clutter_gesture_action_new:
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*
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* Creates a new #ClutterGestureAction instance.
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*
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* Return value: the newly created #ClutterGestureAction
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*
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* Since: 1.8
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*/
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ClutterAction *
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clutter_gesture_action_new (void)
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{
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return g_object_new (CLUTTER_TYPE_GESTURE_ACTION, NULL);
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}
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/**
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* clutter_gesture_action_get_press_coords:
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* @action: a #ClutterGestureAction
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* @device: currently unused, set to 0
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* @press_x: (out): return location for the press event's X coordinate
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* @press_y: (out): return location for the press event's Y coordinate
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*
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* Retrieves the coordinates, in stage space, of the press event
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* that started the dragging for an specific pointer device
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*
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* Since: 1.8
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*/
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void
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clutter_gesture_action_get_press_coords (ClutterGestureAction *action,
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guint device,
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gfloat *press_x,
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gfloat *press_y)
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{
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g_return_if_fail (CLUTTER_IS_GESTURE_ACTION (action));
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if (device != 0)
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g_warning ("Multi-device support not yet implemented");
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if (press_x)
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*press_x = action->priv->press_x;
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if (press_y)
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*press_y = action->priv->press_y;
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}
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/**
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* clutter_gesture_action_get_motion_coords:
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* @action: a #ClutterGestureAction
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* @device: currently unused, set to 0
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* @motion_x: (out): return location for the latest motion
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* event's X coordinate
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* @motion_y: (out): return location for the latest motion
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* event's Y coordinate
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*
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* Retrieves the coordinates, in stage space, of the latest motion
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* event during the dragging
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*
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* Since: 1.8
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*/
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void
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clutter_gesture_action_get_motion_coords (ClutterGestureAction *action,
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guint device,
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gfloat *motion_x,
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gfloat *motion_y)
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{
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g_return_if_fail (CLUTTER_IS_GESTURE_ACTION (action));
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if (device != 0)
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g_warning ("Multi-device support not yet implemented");
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if (motion_x)
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*motion_x = action->priv->last_motion_x;
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if (motion_y)
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*motion_y = action->priv->last_motion_y;
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}
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/**
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* clutter_gesture_action_get_release_coords:
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* @action: a #ClutterGestureAction
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* @device: currently unused, set to 0
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* @release_x: (out): return location for the X coordinate of the last release
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* @release_y: (out): return location for the Y coordinate of the last release
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*
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* Retrieves the coordinates, in stage space, of the point where the pointer
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* device was last released.
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*
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* Since: 1.8
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*/
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void
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clutter_gesture_action_get_release_coords (ClutterGestureAction *action,
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guint device,
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gfloat *release_x,
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gfloat *release_y)
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{
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g_return_if_fail (CLUTTER_IS_GESTURE_ACTION (action));
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if (device != 0)
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g_warning ("Multi-device support not yet implemented");
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if (release_x)
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*release_x = action->priv->release_x;
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if (release_y)
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*release_y = action->priv->release_y;
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}
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