443 lines
12 KiB
C
443 lines
12 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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*
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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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* Emmanuele Bassi <ebassi@linux.intel.com>
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*/
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/**
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* SECTION:clutter-align-constraint
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* @Title: ClutterAlignConstraint
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* @Short_Description: A constraint aligning the position of an actor
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*
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* #ClutterAlignConstraint is a #ClutterConstraint that aligns the position
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* of the #ClutterActor to which it is applied to the size of another
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* #ClutterActor using an alignment factor
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*
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* #ClutterAlignConstraint is available since Clutter 1.4
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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-align-constraint.h"
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#include "clutter-constraint.h"
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#include "clutter-debug.h"
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#include "clutter-enum-types.h"
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#include "clutter-private.h"
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#define CLUTTER_ALIGN_CONSTRAINT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_ALIGN_CONSTRAINT, ClutterAlignConstraintClass))
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#define CLUTTER_IS_ALIGN_CONSTRAINT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_ALIGN_CONSTRAINT))
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#define CLUTTER_ALIGN_CONSTRAINT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_ALIGN_CONSTRAINT, ClutterAlignConstraintClass))
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typedef struct _ClutterAlignConstraintClass ClutterAlignConstraintClass;
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struct _ClutterAlignConstraint
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{
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ClutterConstraint parent_instance;
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ClutterActor *source;
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ClutterAlignAxis align_axis;
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gfloat factor;
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};
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struct _ClutterAlignConstraintClass
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{
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ClutterConstraintClass parent_class;
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};
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enum
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{
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PROP_0,
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PROP_SOURCE,
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PROP_ALIGN_AXIS,
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PROP_FACTOR
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};
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G_DEFINE_TYPE (ClutterAlignConstraint,
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clutter_align_constraint,
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CLUTTER_TYPE_CONSTRAINT);
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static void
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update_actor_position (ClutterAlignConstraint *align)
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{
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gfloat source_width, source_height;
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gfloat actor_width, actor_height;
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ClutterActor *actor;
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if (!clutter_actor_meta_get_enabled (CLUTTER_ACTOR_META (align)))
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return;
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actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (align));
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if (actor == NULL)
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return;
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if (align->source == NULL)
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return;
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clutter_actor_get_size (align->source, &source_width, &source_height);
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clutter_actor_get_size (actor, &actor_width, &actor_height);
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switch (align->align_axis)
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{
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case CLUTTER_ALIGN_X_AXIS:
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clutter_actor_set_x (actor, (source_width - actor_width) * align->factor);
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break;
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case CLUTTER_ALIGN_Y_AXIS:
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clutter_actor_set_y (actor, (source_height - actor_height) * align->factor);
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break;
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}
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}
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static void
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source_position_changed (GObject *gobject,
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GParamSpec *pspec,
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ClutterAlignConstraint *align)
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{
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if (strcmp (pspec->name, "width") == 0 ||
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strcmp (pspec->name, "height") == 0)
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{
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update_actor_position (align);
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}
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}
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static void
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source_destroyed (ClutterActor *actor,
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ClutterAlignConstraint *align)
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{
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align->source = NULL;
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}
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static void
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clutter_align_constraint_set_property (GObject *gobject,
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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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ClutterAlignConstraint *align = CLUTTER_ALIGN_CONSTRAINT (gobject);
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switch (prop_id)
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{
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case PROP_SOURCE:
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clutter_align_constraint_set_source (align, g_value_get_object (value));
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break;
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case PROP_ALIGN_AXIS:
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clutter_align_constraint_set_align_axis (align, g_value_get_enum (value));
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break;
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case PROP_FACTOR:
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clutter_align_constraint_set_factor (align, g_value_get_float (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, 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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clutter_align_constraint_get_property (GObject *gobject,
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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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ClutterAlignConstraint *align = CLUTTER_ALIGN_CONSTRAINT (gobject);
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switch (prop_id)
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{
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case PROP_SOURCE:
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g_value_set_object (value, align->source);
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break;
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case PROP_ALIGN_AXIS:
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g_value_set_enum (value, align->align_axis);
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break;
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case PROP_FACTOR:
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g_value_set_float (value, align->factor);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, 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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clutter_align_constraint_class_init (ClutterAlignConstraintClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GParamSpec *pspec;
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gobject_class->set_property = clutter_align_constraint_set_property;
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gobject_class->get_property = clutter_align_constraint_get_property;
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/**
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* ClutterAlignConstraint:source:
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*
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* The #ClutterActor used as the source for the alignment
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*
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* Since: 1.4
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*/
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pspec = g_param_spec_object ("source",
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"Source",
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"The source of the alignment",
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CLUTTER_TYPE_ACTOR,
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CLUTTER_PARAM_READWRITE |
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G_PARAM_CONSTRUCT);
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g_object_class_install_property (gobject_class, PROP_SOURCE, pspec);
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/**
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* ClutterAlignConstraint:align-axis:
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*
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* The axis to be used to compute the alignment
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*
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* Since: 1.4
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*/
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pspec = g_param_spec_enum ("align-axis",
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"Align Axis",
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"The axis to align the position to",
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CLUTTER_TYPE_ALIGN_AXIS,
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CLUTTER_ALIGN_X_AXIS,
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CLUTTER_PARAM_READWRITE |
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G_PARAM_CONSTRUCT);
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g_object_class_install_property (gobject_class, PROP_ALIGN_AXIS, pspec);
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/**
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* ClutterAlignConstraint:factor:
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*
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* The alignment factor, as a normalized value between 0.0 and 1.0
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*
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* The #ClutterAlignConstraint:factor depends on the
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* #ClutterAlignConstraint:align-axis value: with %CLUTTER_ALIGN_X_AXIS,
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* 0.0 means left and 1.0 means right; with %CLUTTER_ALIGN_Y_AXIS, 0.0
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* means top and 1.0 means bottom
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*
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* Since: 1.4
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*/
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pspec = g_param_spec_float ("factor",
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"Factor",
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"The alignment factor, between 0.0 and 1.0",
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0.0, 1.0,
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0.0,
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CLUTTER_PARAM_READWRITE |
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G_PARAM_CONSTRUCT);
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g_object_class_install_property (gobject_class, PROP_FACTOR, pspec);
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}
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static void
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clutter_align_constraint_init (ClutterAlignConstraint *self)
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{
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self->source = NULL;
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self->align_axis = CLUTTER_ALIGN_X_AXIS;
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self->factor = 0.0f;
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}
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/**
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* clutter_align_constraint_new:
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* @source: the #ClutterActor to use as the source of the alignment
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* @axis: the axis to be used to compute the alignment
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* @factor: the alignment factor, between 0.0 and 1.0
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*
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* Creates a new constraint, aligning a #ClutterActor's position with
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* regards of the size of the actor to @source, with the given alignment
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* @factor
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*
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* Return value: the newly created #ClutterAlignConstraint
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*
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* Since: 1.4
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*/
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ClutterConstraint *
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clutter_align_constraint_new (ClutterActor *source,
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ClutterAlignAxis axis,
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gfloat factor)
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{
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g_return_val_if_fail (CLUTTER_IS_ACTOR (source), NULL);
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return g_object_new (CLUTTER_TYPE_ALIGN_CONSTRAINT,
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"source", source,
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"align-axis", axis,
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"factor", factor,
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NULL);
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}
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/**
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* clutter_align_constraint_set_source:
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* @align: a #ClutterAlignConstraint
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* @source: a #ClutterActor
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*
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* Sets the source of the alignment constraint
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*
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* Since: 1.4
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*/
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void
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clutter_align_constraint_set_source (ClutterAlignConstraint *align,
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ClutterActor *source)
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{
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ClutterActor *old_source;
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g_return_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align));
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g_return_if_fail (CLUTTER_IS_ACTOR (source));
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if (align->source == source)
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return;
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old_source = align->source;
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if (old_source != NULL)
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{
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g_signal_handlers_disconnect_by_func (old_source,
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G_CALLBACK (source_destroyed),
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align);
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g_signal_handlers_disconnect_by_func (old_source,
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G_CALLBACK (source_position_changed),
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align);
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}
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align->source = source;
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g_signal_connect (align->source, "notify",
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G_CALLBACK (source_position_changed),
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align);
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g_signal_connect (align->source, "destroy",
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G_CALLBACK (source_destroyed),
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align);
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update_actor_position (align);
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g_object_notify (G_OBJECT (align), "source");
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}
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/**
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* clutter_align_constraint_get_source:
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* @align: a #ClutterAlignConstraint
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*
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* Retrieves the source of the alignment
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*
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* Return value: (transfer none): the #ClutterActor used as the source
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* of the alignment
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*
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* Since: 1.4
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*/
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ClutterActor *
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clutter_align_constraint_get_source (ClutterAlignConstraint *align)
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{
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g_return_val_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align), NULL);
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return align->source;
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}
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/**
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* clutter_align_constraint_set_align_axis:
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* @align: a #ClutterAlignConstraint
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* @axis: the axis to which the alignment refers to
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*
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* Sets the axis to which the alignment refers to
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*
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* Since: 1.4
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*/
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void
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clutter_align_constraint_set_align_axis (ClutterAlignConstraint *align,
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ClutterAlignAxis axis)
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{
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g_return_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align));
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if (align->align_axis == axis)
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return;
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align->align_axis = axis;
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update_actor_position (align);
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g_object_notify (G_OBJECT (align), "align-axis");
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}
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/**
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* clutter_align_constraint_get_align_axis:
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* @align: a #ClutterAlignConstraint
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*
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* Retrieves the value set using clutter_align_constraint_set_align_axis()
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*
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* Return value: the alignment axis
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*
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* Since: 1.4
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*/
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ClutterAlignAxis
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clutter_align_constraint_get_align_axis (ClutterAlignConstraint *align)
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{
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g_return_val_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align),
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CLUTTER_ALIGN_X_AXIS);
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return align->align_axis;
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}
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/**
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* clutter_align_constraint_set_factor:
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* @align: a #ClutterAlignConstraint
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* @factor: the alignment factor, between 0.0 and 1.0
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*
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* Sets the alignment factor of the constraint
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*
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* The factor depends on the #ClutterAlignConstraint:align-axis property
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* and it is a value between 0.0 (meaning left, when
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* #ClutterAlignConstraint:align-axis is set to %CLUTTER_ALIGN_X_AXIS; or
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* meaning top, when #ClutterAlignConstraint:align-axis is set to
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* %CLUTTER_ALIGN_Y_AXIS) and 1.0 (meaning right, when
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* #ClutterAlignConstraint:align-axis is set to %CLUTTER_ALIGN_X_AXIS; or
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* meaning bottom, when #ClutterAlignConstraint:align-axis is set to
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* %CLUTTER_ALIGN_Y_AXIS). A value of 0.5 aligns in the middle in either
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* cases
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*
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* Since: 1.4
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*/
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void
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clutter_align_constraint_set_factor (ClutterAlignConstraint *align,
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gfloat factor)
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{
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g_return_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align));
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align->factor = CLAMP (factor, 0.0, 1.0);
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update_actor_position (align);
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g_object_notify (G_OBJECT (align), "factor");
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}
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/**
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* clutter_align_constraint_get_factor:
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* @align: a #ClutterAlignConstraint
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*
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* Retrieves the factor set using clutter_align_constraint_set_factor()
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*
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* Return value: the alignment factor
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*
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* Since: 1.4
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*/
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gfloat
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clutter_align_constraint_get_factor (ClutterAlignConstraint *align)
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{
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g_return_val_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align), 0.0);
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return align->factor;
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}
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