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mutter-performance-source/clutter/clutter-align-constraint.c
Neil Roberts 8d51617979 Conditionally use g_object_notify_by_pspec 
This adds a wrapper macro to clutter-private that will use
g_object_notify_by_pspec if it's compiled against a version of GLib
that is sufficiently new. Otherwise it will notify by the property
name as before by extracting the name from the pspec. The objects can
then store a static array of GParamSpecs and notify using those as
suggested in the documentation for g_object_notify_by_pspec.

Note that the name of the variable used for storing the array of
GParamSpecs is obj_props instead of properties as used in the
documentation because some places in Clutter uses 'properties' as the
name of a local variable.

Mose of the classes in Clutter have been converted using the script in
the bug report. Some classes have not been modified even though the
script picked them up as described here:

json-generator:

 We probably don't want to modify the internal copy of JSON

behaviour-depth:
rectangle:
score:
stage-manager:

 These aren't using the separate GParamSpec* variable style.

blur-effect:
win32/device-manager:

 Don't actually define any properties even though it has the enum.

box-layout:
flow-layout:

  Have some per-child properties that don't work automatically with
  the script.

clutter-model:

  The script gets confused with ClutterModelIter

stage:

  Script gets confused because PROP_USER_RESIZE doesn't match
  "user-resizable"

test-layout:

  Don't really want to modify the tests

http://bugzilla.clutter-project.org/show_bug.cgi?id=2150
2010-08-10 17:12:06 +01:00

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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-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,
PROP_LAST
};
static GParamSpec *obj_props[PROP_LAST];
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;
gfloat source_x, source_y;
gfloat new_position;
ClutterActor *actor;
if (align->source == NULL)
return;
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;
clutter_actor_get_position (align->source, &source_x, &source_y);
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:
new_position = ((source_width - actor_width) * align->factor)
+ source_x;
clutter_actor_set_x (actor, new_position);
break;
case CLUTTER_ALIGN_Y_AXIS:
new_position = ((source_height - actor_height) * align->factor)
+ source_y;
clutter_actor_set_y (actor, new_position);
break;
}
}
static void
source_position_changed (ClutterActor *actor,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags,
ClutterAlignConstraint *align)
{
update_actor_position (align);
}
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:
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);
GParamSpec *pspec;
gobject_class->set_property = clutter_align_constraint_set_property;
gobject_class->get_property = clutter_align_constraint_get_property;
/**
* ClutterAlignConstraint:source:
*
* The #ClutterActor used as the source for the alignment
*
* Since: 1.4
*/
pspec = g_param_spec_object ("source",
P_("Source"),
P_("The source of the alignment"),
CLUTTER_TYPE_ACTOR,
CLUTTER_PARAM_READWRITE |
G_PARAM_CONSTRUCT);
obj_props[PROP_SOURCE] = pspec;
g_object_class_install_property (gobject_class, PROP_SOURCE, pspec);
/**
* ClutterAlignConstraint:align-axis:
*
* The axis to be used to compute the alignment
*
* Since: 1.4
*/
pspec = 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);
obj_props[PROP_ALIGN_AXIS] = pspec;
g_object_class_install_property (gobject_class, PROP_ALIGN_AXIS, pspec);
/**
* 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
*/
pspec = 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);
obj_props[PROP_FACTOR] = pspec;
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;
}
/**
* 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;
g_return_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align));
g_return_if_fail (source == NULL || CLUTTER_IS_ACTOR (source));
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;
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);
update_actor_position (align);
}
_clutter_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;
update_actor_position (align);
_clutter_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);
update_actor_position (align);
_clutter_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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