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mutter/clutter/clutter-align-constraint.c
Emmanuele Bassi 77ec8774a0 WARNING: Massive revert commit 
Revert all the work that happened on the master branch.

Sadly, this is the only way to merge the current development branch back
into master.

It is now abundantly clear that I merged the 1.99 branch far too soon,
and that Clutter 2.0 won't happen any time soon, if at all.

Since having the development happen on a separate branch throws a lot of
people into confusion, let's undo the clutter-1.99 → master merge, and
move back the development of Clutter to the master branch.

In order to do so, we need to do some surgery to the Git repository.

First, we do a massive revert in a single commit of all that happened
since the switch to 1.99 and the API version bump done with the
89a2862b05 commit. The history is too long
to be reverted commit by commit without being extremely messy.
2015-01-03 20:34:20 +00:00

543 lines
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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Copyright (C) 2010 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Author:
* Emmanuele Bassi <ebassi@linux.intel.com>
*/
/**
* SECTION:clutter-align-constraint
* @Title: ClutterAlignConstraint
* @Short_Description: A constraint aligning the position of an actor
*
* #ClutterAlignConstraint is a #ClutterConstraint that aligns the position
* of the #ClutterActor to which it is applied to the size of another
* #ClutterActor using an alignment factor
*
* #ClutterAlignConstraint is available since Clutter 1.4
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-align-constraint.h"
#include "clutter-actor-meta-private.h"
#include "clutter-actor-private.h"
#include "clutter-constraint.h"
#include "clutter-debug.h"
#include "clutter-enum-types.h"
#include "clutter-private.h"
#include <math.h>
#define CLUTTER_ALIGN_CONSTRAINT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_ALIGN_CONSTRAINT, ClutterAlignConstraintClass))
#define CLUTTER_IS_ALIGN_CONSTRAINT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_ALIGN_CONSTRAINT))
#define CLUTTER_ALIGN_CONSTRAINT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_ALIGN_CONSTRAINT, ClutterAlignConstraintClass))
struct _ClutterAlignConstraint
{
ClutterConstraint parent_instance;
ClutterActor *actor;
ClutterActor *source;
ClutterAlignAxis align_axis;
gfloat factor;
};
struct _ClutterAlignConstraintClass
{
ClutterConstraintClass parent_class;
};
enum
{
PROP_0,
PROP_SOURCE,
PROP_ALIGN_AXIS,
PROP_FACTOR,
PROP_LAST
};
static GParamSpec *obj_props[PROP_LAST];
G_DEFINE_TYPE (ClutterAlignConstraint,
clutter_align_constraint,
CLUTTER_TYPE_CONSTRAINT);
static void
source_position_changed (ClutterActor *actor,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags,
ClutterAlignConstraint *align)
{
if (align->actor != NULL)
clutter_actor_queue_relayout (align->actor);
}
static void
source_destroyed (ClutterActor *actor,
ClutterAlignConstraint *align)
{
align->source = NULL;
}
static void
clutter_align_constraint_set_actor (ClutterActorMeta *meta,
ClutterActor *new_actor)
{
ClutterAlignConstraint *align = CLUTTER_ALIGN_CONSTRAINT (meta);
ClutterActorMetaClass *parent;
if (new_actor != NULL &&
align->source != NULL &&
clutter_actor_contains (new_actor, align->source))
{
g_warning (G_STRLOC ": The source actor '%s' is contained "
"by the actor '%s' associated to the constraint "
"'%s'",
_clutter_actor_get_debug_name (align->source),
_clutter_actor_get_debug_name (new_actor),
_clutter_actor_meta_get_debug_name (meta));
return;
}
/* store the pointer to the actor, for later use */
align->actor = new_actor;
parent = CLUTTER_ACTOR_META_CLASS (clutter_align_constraint_parent_class);
parent->set_actor (meta, new_actor);
}
static void
clutter_align_constraint_update_allocation (ClutterConstraint *constraint,
ClutterActor *actor,
ClutterActorBox *allocation)
{
ClutterAlignConstraint *align = CLUTTER_ALIGN_CONSTRAINT (constraint);
gfloat source_width, source_height;
gfloat actor_width, actor_height;
gfloat source_x, source_y;
if (align->source == NULL)
return;
clutter_actor_box_get_size (allocation, &actor_width, &actor_height);
clutter_actor_get_position (align->source, &source_x, &source_y);
clutter_actor_get_size (align->source, &source_width, &source_height);
switch (align->align_axis)
{
case CLUTTER_ALIGN_X_AXIS:
allocation->x1 = ((source_width - actor_width) * align->factor)
+ source_x;
allocation->x2 = allocation->x1 + actor_width;
break;
case CLUTTER_ALIGN_Y_AXIS:
allocation->y1 = ((source_height - actor_height) * align->factor)
+ source_y;
allocation->y2 = allocation->y1 + actor_height;
break;
case CLUTTER_ALIGN_BOTH:
allocation->x1 = ((source_width - actor_width) * align->factor)
+ source_x;
allocation->y1 = ((source_height - actor_height) * align->factor)
+ source_y;
allocation->x2 = allocation->x1 + actor_width;
allocation->y2 = allocation->y1 + actor_height;
break;
default:
g_assert_not_reached ();
break;
}
clutter_actor_box_clamp_to_pixel (allocation);
}
static void
clutter_align_constraint_dispose (GObject *gobject)
{
ClutterAlignConstraint *align = CLUTTER_ALIGN_CONSTRAINT (gobject);
if (align->source != NULL)
{
g_signal_handlers_disconnect_by_func (align->source,
G_CALLBACK (source_destroyed),
align);
g_signal_handlers_disconnect_by_func (align->source,
G_CALLBACK (source_position_changed),
align);
align->source = NULL;
}
G_OBJECT_CLASS (clutter_align_constraint_parent_class)->dispose (gobject);
}
static void
clutter_align_constraint_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterAlignConstraint *align = CLUTTER_ALIGN_CONSTRAINT (gobject);
switch (prop_id)
{
case PROP_SOURCE:
clutter_align_constraint_set_source (align, g_value_get_object (value));
break;
case PROP_ALIGN_AXIS:
clutter_align_constraint_set_align_axis (align, g_value_get_enum (value));
break;
case PROP_FACTOR:
clutter_align_constraint_set_factor (align, g_value_get_float (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_align_constraint_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterAlignConstraint *align = CLUTTER_ALIGN_CONSTRAINT (gobject);
switch (prop_id)
{
case PROP_SOURCE:
g_value_set_object (value, align->source);
break;
case PROP_ALIGN_AXIS:
g_value_set_enum (value, align->align_axis);
break;
case PROP_FACTOR:
g_value_set_float (value, align->factor);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_align_constraint_class_init (ClutterAlignConstraintClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterActorMetaClass *meta_class = CLUTTER_ACTOR_META_CLASS (klass);
ClutterConstraintClass *constraint_class = CLUTTER_CONSTRAINT_CLASS (klass);
meta_class->set_actor = clutter_align_constraint_set_actor;
constraint_class->update_allocation = clutter_align_constraint_update_allocation;
/**
* ClutterAlignConstraint:source:
*
* The #ClutterActor used as the source for the alignment.
*
* The #ClutterActor must not be a child or a grandchild of the actor
* using the constraint.
*
* Since: 1.4
*/
obj_props[PROP_SOURCE] =
g_param_spec_object ("source",
P_("Source"),
P_("The source of the alignment"),
CLUTTER_TYPE_ACTOR,
CLUTTER_PARAM_READWRITE | G_PARAM_CONSTRUCT);
/**
* ClutterAlignConstraint:align-axis:
*
* The axis to be used to compute the alignment
*
* Since: 1.4
*/
obj_props[PROP_ALIGN_AXIS] =
g_param_spec_enum ("align-axis",
P_("Align Axis"),
P_("The axis to align the position to"),
CLUTTER_TYPE_ALIGN_AXIS,
CLUTTER_ALIGN_X_AXIS,
CLUTTER_PARAM_READWRITE | G_PARAM_CONSTRUCT);
/**
* ClutterAlignConstraint:factor:
*
* The alignment factor, as a normalized value between 0.0 and 1.0
*
* The factor depends on the #ClutterAlignConstraint:align-axis property:
* with an align-axis value of %CLUTTER_ALIGN_X_AXIS, 0.0 means left and
* 1.0 means right; with a value of %CLUTTER_ALIGN_Y_AXIS, 0.0 means top
* and 1.0 means bottom.
*
* Since: 1.4
*/
obj_props[PROP_FACTOR] =
g_param_spec_float ("factor",
P_("Factor"),
P_("The alignment factor, between 0.0 and 1.0"),
0.0, 1.0,
0.0,
CLUTTER_PARAM_READWRITE | G_PARAM_CONSTRUCT);
gobject_class->dispose = clutter_align_constraint_dispose;
gobject_class->set_property = clutter_align_constraint_set_property;
gobject_class->get_property = clutter_align_constraint_get_property;
g_object_class_install_properties (gobject_class, PROP_LAST, obj_props);
}
static void
clutter_align_constraint_init (ClutterAlignConstraint *self)
{
self->actor = NULL;
self->source = NULL;
self->align_axis = CLUTTER_ALIGN_X_AXIS;
self->factor = 0.0f;
}
/**
* clutter_align_constraint_new:
* @source: (allow-none): the #ClutterActor to use as the source of the
* alignment, or %NULL
* @axis: the axis to be used to compute the alignment
* @factor: the alignment factor, between 0.0 and 1.0
*
* Creates a new constraint, aligning a #ClutterActor's position with
* regards of the size of the actor to @source, with the given
* alignment @factor
*
* Return value: the newly created #ClutterAlignConstraint
*
* Since: 1.4
*/
ClutterConstraint *
clutter_align_constraint_new (ClutterActor *source,
ClutterAlignAxis axis,
gfloat factor)
{
g_return_val_if_fail (source == NULL || CLUTTER_IS_ACTOR (source), NULL);
return g_object_new (CLUTTER_TYPE_ALIGN_CONSTRAINT,
"source", source,
"align-axis", axis,
"factor", factor,
NULL);
}
/**
* clutter_align_constraint_set_source:
* @align: a #ClutterAlignConstraint
* @source: (allow-none): a #ClutterActor, or %NULL to unset the source
*
* Sets the source of the alignment constraint
*
* Since: 1.4
*/
void
clutter_align_constraint_set_source (ClutterAlignConstraint *align,
ClutterActor *source)
{
ClutterActor *old_source, *actor;
ClutterActorMeta *meta;
g_return_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align));
g_return_if_fail (source == NULL || CLUTTER_IS_ACTOR (source));
if (align->source == source)
return;
meta = CLUTTER_ACTOR_META (align);
actor = clutter_actor_meta_get_actor (meta);
if (actor != NULL && source != NULL)
{
if (clutter_actor_contains (actor, source))
{
g_warning (G_STRLOC ": The source actor '%s' is contained "
"by the actor '%s' associated to the constraint "
"'%s'",
_clutter_actor_get_debug_name (source),
_clutter_actor_get_debug_name (actor),
_clutter_actor_meta_get_debug_name (meta));
return;
}
}
old_source = align->source;
if (old_source != NULL)
{
g_signal_handlers_disconnect_by_func (old_source,
G_CALLBACK (source_destroyed),
align);
g_signal_handlers_disconnect_by_func (old_source,
G_CALLBACK (source_position_changed),
align);
}
align->source = source;
if (align->source != NULL)
{
g_signal_connect (align->source, "allocation-changed",
G_CALLBACK (source_position_changed),
align);
g_signal_connect (align->source, "destroy",
G_CALLBACK (source_destroyed),
align);
if (align->actor != NULL)
clutter_actor_queue_relayout (align->actor);
}
g_object_notify_by_pspec (G_OBJECT (align), obj_props[PROP_SOURCE]);
}
/**
* clutter_align_constraint_get_source:
* @align: a #ClutterAlignConstraint
*
* Retrieves the source of the alignment
*
* Return value: (transfer none): the #ClutterActor used as the source
* of the alignment
*
* Since: 1.4
*/
ClutterActor *
clutter_align_constraint_get_source (ClutterAlignConstraint *align)
{
g_return_val_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align), NULL);
return align->source;
}
/**
* clutter_align_constraint_set_align_axis:
* @align: a #ClutterAlignConstraint
* @axis: the axis to which the alignment refers to
*
* Sets the axis to which the alignment refers to
*
* Since: 1.4
*/
void
clutter_align_constraint_set_align_axis (ClutterAlignConstraint *align,
ClutterAlignAxis axis)
{
g_return_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align));
if (align->align_axis == axis)
return;
align->align_axis = axis;
if (align->actor != NULL)
clutter_actor_queue_relayout (align->actor);
g_object_notify_by_pspec (G_OBJECT (align), obj_props[PROP_ALIGN_AXIS]);
}
/**
* clutter_align_constraint_get_align_axis:
* @align: a #ClutterAlignConstraint
*
* Retrieves the value set using clutter_align_constraint_set_align_axis()
*
* Return value: the alignment axis
*
* Since: 1.4
*/
ClutterAlignAxis
clutter_align_constraint_get_align_axis (ClutterAlignConstraint *align)
{
g_return_val_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align),
CLUTTER_ALIGN_X_AXIS);
return align->align_axis;
}
/**
* clutter_align_constraint_set_factor:
* @align: a #ClutterAlignConstraint
* @factor: the alignment factor, between 0.0 and 1.0
*
* Sets the alignment factor of the constraint
*
* The factor depends on the #ClutterAlignConstraint:align-axis property
* and it is a value between 0.0 (meaning left, when
* #ClutterAlignConstraint:align-axis is set to %CLUTTER_ALIGN_X_AXIS; or
* meaning top, when #ClutterAlignConstraint:align-axis is set to
* %CLUTTER_ALIGN_Y_AXIS) and 1.0 (meaning right, when
* #ClutterAlignConstraint:align-axis is set to %CLUTTER_ALIGN_X_AXIS; or
* meaning bottom, when #ClutterAlignConstraint:align-axis is set to
* %CLUTTER_ALIGN_Y_AXIS). A value of 0.5 aligns in the middle in either
* cases
*
* Since: 1.4
*/
void
clutter_align_constraint_set_factor (ClutterAlignConstraint *align,
gfloat factor)
{
g_return_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align));
align->factor = CLAMP (factor, 0.0, 1.0);
if (align->actor != NULL)
clutter_actor_queue_relayout (align->actor);
g_object_notify_by_pspec (G_OBJECT (align), obj_props[PROP_FACTOR]);
}
/**
* clutter_align_constraint_get_factor:
* @align: a #ClutterAlignConstraint
*
* Retrieves the factor set using clutter_align_constraint_set_factor()
*
* Return value: the alignment factor
*
* Since: 1.4
*/
gfloat
clutter_align_constraint_get_factor (ClutterAlignConstraint *align)
{
g_return_val_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align), 0.0);
return align->factor;
}
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