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mutter/clutter/clutter-align-constraint.c

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docs: Document BindConstraint and AlignConstraint Add the missing gtk-doc annotations for BindConstraint and AlignConstraint, plus the licensing blurb.
2010-05-19 13:46:02 +00:00
/*
* 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>
*/
/**
Miscellaneous documentation fixes
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* SECTION:clutter-align-constraint
docs: Document BindConstraint and AlignConstraint Add the missing gtk-doc annotations for BindConstraint and AlignConstraint, plus the licensing blurb.
2010-05-19 13:46:02 +00:00
* @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
*/
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-align-constraint.h"
#include "clutter-constraint.h"
#include "clutter-debug.h"
#include "clutter-enum-types.h"
#include "clutter-private.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))
typedef struct _ClutterAlignConstraintClass ClutterAlignConstraintClass;
struct _ClutterAlignConstraint
{
ClutterConstraint parent_instance;
ClutterActor *source;
ClutterAlignAxis align_axis;
gfloat factor;
};
struct _ClutterAlignConstraintClass
{
ClutterConstraintClass parent_class;
};
enum
{
PROP_0,
PROP_SOURCE,
PROP_ALIGN_AXIS,
PROP_FACTOR
};
G_DEFINE_TYPE (ClutterAlignConstraint,
clutter_align_constraint,
CLUTTER_TYPE_CONSTRAINT);
static void
update_actor_position (ClutterAlignConstraint *align)
{
gfloat source_width, source_height;
gfloat actor_width, actor_height;
align-constraint: Follow the position of the source The AlignConstraint update is using only the width/height of the source, but it should also take into account the position. Also, instead of using the ::notify signal, it should follow the BindConstraint, and switch to the ::allocation-changed signal, since it's less expensive (one emission instead of four notifications, one for each property we use).
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gfloat source_x, source_y;
gfloat new_position;
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
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ClutterActor *actor;
align-constraint: Follow the position of the source The AlignConstraint update is using only the width/height of the source, but it should also take into account the position. Also, instead of using the ::notify signal, it should follow the BindConstraint, and switch to the ::allocation-changed signal, since it's less expensive (one emission instead of four notifications, one for each property we use).
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if (align->source == NULL)
return;
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
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if (!clutter_actor_meta_get_enabled (CLUTTER_ACTOR_META (align)))
return;
actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (align));
if (actor == NULL)
return;
align-constraint: Follow the position of the source The AlignConstraint update is using only the width/height of the source, but it should also take into account the position. Also, instead of using the ::notify signal, it should follow the BindConstraint, and switch to the ::allocation-changed signal, since it's less expensive (one emission instead of four notifications, one for each property we use).
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clutter_actor_get_position (align->source, &source_x, &source_y);
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
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clutter_actor_get_size (align->source, &source_width, &source_height);
clutter_actor_get_size (actor, &actor_width, &actor_height);
switch (align->align_axis)
{
case CLUTTER_ALIGN_X_AXIS:
align-constraint: Offset the position after the alignment factor Instead of aligning (pos + size), align on size alone, and then offset by pos. http://bugzilla.clutter-project.org/show_bug.cgi?id=2168
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new_position = ((source_width - actor_width) * align->factor)
+ source_x;
align-constraint: Follow the position of the source The AlignConstraint update is using only the width/height of the source, but it should also take into account the position. Also, instead of using the ::notify signal, it should follow the BindConstraint, and switch to the ::allocation-changed signal, since it's less expensive (one emission instead of four notifications, one for each property we use).
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clutter_actor_set_x (actor, new_position);
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
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break;
case CLUTTER_ALIGN_Y_AXIS:
align-constraint: Offset the position after the alignment factor Instead of aligning (pos + size), align on size alone, and then offset by pos. http://bugzilla.clutter-project.org/show_bug.cgi?id=2168
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new_position = ((source_height - actor_height) * align->factor)
+ source_y;
align-constraint: Follow the position of the source The AlignConstraint update is using only the width/height of the source, but it should also take into account the position. Also, instead of using the ::notify signal, it should follow the BindConstraint, and switch to the ::allocation-changed signal, since it's less expensive (one emission instead of four notifications, one for each property we use).
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clutter_actor_set_y (actor, new_position);
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
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break;
}
}
static void
align-constraint: Follow the position of the source The AlignConstraint update is using only the width/height of the source, but it should also take into account the position. Also, instead of using the ::notify signal, it should follow the BindConstraint, and switch to the ::allocation-changed signal, since it's less expensive (one emission instead of four notifications, one for each property we use).
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source_position_changed (ClutterActor *actor,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags,
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
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ClutterAlignConstraint *align)
{
align-constraint: Follow the position of the source The AlignConstraint update is using only the width/height of the source, but it should also take into account the position. Also, instead of using the ::notify signal, it should follow the BindConstraint, and switch to the ::allocation-changed signal, since it's less expensive (one emission instead of four notifications, one for each property we use).
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update_actor_position (align);
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
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}
static void
source_destroyed (ClutterActor *actor,
ClutterAlignConstraint *align)
{
align->source = NULL;
}
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:
align-constraint: Publish the properties accessors The accessor methods for the AlignConstraint properties should be public.
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clutter_align_constraint_set_source (align, g_value_get_object (value));
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
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break;
case PROP_ALIGN_AXIS:
align-constraint: Publish the properties accessors The accessor methods for the AlignConstraint properties should be public.
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clutter_align_constraint_set_align_axis (align, g_value_get_enum (value));
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
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break;
case PROP_FACTOR:
align-constraint: Publish the properties accessors The accessor methods for the AlignConstraint properties should be public.
2010-06-16 11:47:56 +00:00
clutter_align_constraint_set_factor (align, g_value_get_float (value));
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
2010-05-19 12:02:43 +00:00
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);
GParamSpec *pspec;
gobject_class->set_property = clutter_align_constraint_set_property;
gobject_class->get_property = clutter_align_constraint_get_property;
docs: Document BindConstraint and AlignConstraint Add the missing gtk-doc annotations for BindConstraint and AlignConstraint, plus the licensing blurb.
2010-05-19 13:46:02 +00:00
/**
* ClutterAlignConstraint:source:
*
* The #ClutterActor used as the source for the alignment
*
* Since: 1.4
*/
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
2010-05-19 12:02:43 +00:00
pspec = g_param_spec_object ("source",
"Source",
docs: Document BindConstraint and AlignConstraint Add the missing gtk-doc annotations for BindConstraint and AlignConstraint, plus the licensing blurb.
2010-05-19 13:46:02 +00:00
"The source of the alignment",
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
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CLUTTER_TYPE_ACTOR,
CLUTTER_PARAM_READWRITE |
G_PARAM_CONSTRUCT);
g_object_class_install_property (gobject_class, PROP_SOURCE, pspec);
docs: Document BindConstraint and AlignConstraint Add the missing gtk-doc annotations for BindConstraint and AlignConstraint, plus the licensing blurb.
2010-05-19 13:46:02 +00:00
/**
* ClutterAlignConstraint:align-axis:
*
* The axis to be used to compute the alignment
*
* Since: 1.4
*/
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
2010-05-19 12:02:43 +00:00
pspec = g_param_spec_enum ("align-axis",
"Align Axis",
"The axis to align the position to",
CLUTTER_TYPE_ALIGN_AXIS,
CLUTTER_ALIGN_X_AXIS,
CLUTTER_PARAM_READWRITE |
G_PARAM_CONSTRUCT);
g_object_class_install_property (gobject_class, PROP_ALIGN_AXIS, pspec);
docs: Document BindConstraint and AlignConstraint Add the missing gtk-doc annotations for BindConstraint and AlignConstraint, plus the licensing blurb.
2010-05-19 13:46:02 +00:00
/**
* ClutterAlignConstraint:factor:
*
* The alignment factor, as a normalized value between 0.0 and 1.0
*
docs: Avoid warnings from the g-ir-scanner The scanner has some issues when parsing valid gtk-doc annotations; we should make its (and, in return, ours) life easier. We still get warnings for code declared in <programlisting> sections, unfortunately.
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* 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.
docs: Document BindConstraint and AlignConstraint Add the missing gtk-doc annotations for BindConstraint and AlignConstraint, plus the licensing blurb.
2010-05-19 13:46:02 +00:00
*
* Since: 1.4
*/
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
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pspec = g_param_spec_float ("factor",
"Factor",
"The alignment factor, between 0.0 and 1.0",
0.0, 1.0,
0.0,
CLUTTER_PARAM_READWRITE |
G_PARAM_CONSTRUCT);
g_object_class_install_property (gobject_class, PROP_FACTOR, pspec);
}
static void
clutter_align_constraint_init (ClutterAlignConstraint *self)
{
self->source = NULL;
self->align_axis = CLUTTER_ALIGN_X_AXIS;
self->factor = 0.0f;
}
docs: Document BindConstraint and AlignConstraint Add the missing gtk-doc annotations for BindConstraint and AlignConstraint, plus the licensing blurb.
2010-05-19 13:46:02 +00:00
/**
* clutter_align_constraint_new:
constraints: Allow Align and Bind sources to be NULL Since constructing AlignConstraint and BindConstraint instances could be deferred (think ClutterScript) we need to make their :source properties setters accept NULL. This does not break the constraints because they need to handle that condition in case they actor to which they are applied is destroyed and somebody is holding a reference on them anyway.
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* @source: (allow-none): the #ClutterActor to use as the source of the
* alignment, or %NULL
docs: Document BindConstraint and AlignConstraint Add the missing gtk-doc annotations for BindConstraint and AlignConstraint, plus the licensing blurb.
2010-05-19 13:46:02 +00:00
* @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
docs: Avoid warnings from the g-ir-scanner The scanner has some issues when parsing valid gtk-doc annotations; we should make its (and, in return, ours) life easier. We still get warnings for code declared in <programlisting> sections, unfortunately.
2010-06-30 13:58:47 +00:00
* regards of the size of the actor to @source, with the given
* alignment @factor
docs: Document BindConstraint and AlignConstraint Add the missing gtk-doc annotations for BindConstraint and AlignConstraint, plus the licensing blurb.
2010-05-19 13:46:02 +00:00
*
* Return value: the newly created #ClutterAlignConstraint
*
* Since: 1.4
*/
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
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ClutterConstraint *
clutter_align_constraint_new (ClutterActor *source,
ClutterAlignAxis axis,
gfloat factor)
{
constraints: Allow Align and Bind sources to be NULL Since constructing AlignConstraint and BindConstraint instances could be deferred (think ClutterScript) we need to make their :source properties setters accept NULL. This does not break the constraints because they need to handle that condition in case they actor to which they are applied is destroyed and somebody is holding a reference on them anyway.
2010-06-17 16:33:10 +00:00
g_return_val_if_fail (source == NULL || CLUTTER_IS_ACTOR (source), NULL);
constraints: Add AlignConstraint AlignConstraint is a simple constraint that keeps an actor's position aligned to the width or height of another actor, multiplied by an alignment factor.
2010-05-19 12:02:43 +00:00
return g_object_new (CLUTTER_TYPE_ALIGN_CONSTRAINT,
"source", source,
"align-axis", axis,
"factor", factor,
NULL);
}
align-constraint: Publish the properties accessors The accessor methods for the AlignConstraint properties should be public.
2010-06-16 11:47:56 +00:00
/**
* clutter_align_constraint_set_source:
* @align: a #ClutterAlignConstraint
constraints: Allow Align and Bind sources to be NULL Since constructing AlignConstraint and BindConstraint instances could be deferred (think ClutterScript) we need to make their :source properties setters accept NULL. This does not break the constraints because they need to handle that condition in case they actor to which they are applied is destroyed and somebody is holding a reference on them anyway.
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* @source: (allow-none): a #ClutterActor, or %NULL to unset the source
align-constraint: Publish the properties accessors The accessor methods for the AlignConstraint properties should be public.
2010-06-16 11:47:56 +00:00
*
* Sets the source of the alignment constraint
*
* Since: 1.4
*/
void
clutter_align_constraint_set_source (ClutterAlignConstraint *align,
ClutterActor *source)
{
ClutterActor *old_source;
g_return_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align));
constraints: Allow Align and Bind sources to be NULL Since constructing AlignConstraint and BindConstraint instances could be deferred (think ClutterScript) we need to make their :source properties setters accept NULL. This does not break the constraints because they need to handle that condition in case they actor to which they are applied is destroyed and somebody is holding a reference on them anyway.
2010-06-17 16:33:10 +00:00
g_return_if_fail (source == NULL || CLUTTER_IS_ACTOR (source));
align-constraint: Publish the properties accessors The accessor methods for the AlignConstraint properties should be public.
2010-06-16 11:47:56 +00:00
if (align->source == source)
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;
constraints: Allow Align and Bind sources to be NULL Since constructing AlignConstraint and BindConstraint instances could be deferred (think ClutterScript) we need to make their :source properties setters accept NULL. This does not break the constraints because they need to handle that condition in case they actor to which they are applied is destroyed and somebody is holding a reference on them anyway.
2010-06-17 16:33:10 +00:00
if (align->source != NULL)
{
align-constraint: Follow the position of the source The AlignConstraint update is using only the width/height of the source, but it should also take into account the position. Also, instead of using the ::notify signal, it should follow the BindConstraint, and switch to the ::allocation-changed signal, since it's less expensive (one emission instead of four notifications, one for each property we use).
2010-07-01 13:09:37 +00:00
g_signal_connect (align->source, "allocation-changed",
constraints: Allow Align and Bind sources to be NULL Since constructing AlignConstraint and BindConstraint instances could be deferred (think ClutterScript) we need to make their :source properties setters accept NULL. This does not break the constraints because they need to handle that condition in case they actor to which they are applied is destroyed and somebody is holding a reference on them anyway.
2010-06-17 16:33:10 +00:00
G_CALLBACK (source_position_changed),
align);
g_signal_connect (align->source, "destroy",
G_CALLBACK (source_destroyed),
align);
update_actor_position (align);
}
align-constraint: Publish the properties accessors The accessor methods for the AlignConstraint properties should be public.
2010-06-16 11:47:56 +00:00
g_object_notify (G_OBJECT (align), "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;
update_actor_position (align);
g_object_notify (G_OBJECT (align), "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);
update_actor_position (align);
g_object_notify (G_OBJECT (align), "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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