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[layout] Add initial implementation of LayoutManager

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The LayoutManager class is an abstract proxy for the size requesition
and size allocation process in ClutterActor.

A ClutterLayoutManager sub-class must implement get_preferred_width(),
get_preferred_height() and allocate(); a ClutterContainer using the
LayoutManager API will then proxy the corresponding Actor virtual
functions to the LayoutManager instance. This allows having a generic
"blank" ClutterActor sub-class, implementing the ClutterContainer
interface, which leaves only the layout management implementation to
the application developers.
This commit is contained in:
Emmanuele Bassi 2009-09-01 16:34:28 +01:00
parent 4f2bfc003a
commit d6183e95e5
4 changed files with 275 additions and 0 deletions
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2
clutter/Makefile.am
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@ -78,6 +78,7 @@ source_h = \
$(srcdir)/clutter-group.h \
$(srcdir)/clutter-interval.h \
$(srcdir)/clutter-keysyms.h \
$(srcdir)/clutter-layout-manager.h \
$(srcdir)/clutter-list-model.h \
$(srcdir)/clutter-main.h \
$(srcdir)/clutter-media.h \
@ -142,6 +143,7 @@ source_c = \
$(srcdir)/clutter-group.c \
$(srcdir)/clutter-id-pool.c \
$(srcdir)/clutter-interval.c \
$(srcdir)/clutter-layout-manager.c \
$(srcdir)/clutter-list-model.c \
$(srcdir)/clutter-main.c \
clutter-marshal.c \

180
clutter/clutter-layout-manager.c Normal file
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@ -0,0 +1,180 @@
/**
* SECTION:clutter-layout-manager
* @short_description: Layout managers base class
*
* #ClutterLayoutManager is FIXME
*
* #ClutterLayoutManager is available since Clutter 1.2
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-debug.h"
#include "clutter-layout-manager.h"
#include "clutter-marshal.h"
#include "clutter-private.h"
#define LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED(m,method) G_STMT_START { \
GObject *_obj = G_OBJECT (m); \
g_warning ("Layout managers of type %s do not implement " \
"the ClutterLayoutManager::%s method", \
G_OBJECT_TYPE_NAME (_obj), \
(method)); } G_STMT_END
G_DEFINE_ABSTRACT_TYPE (ClutterLayoutManager, clutter_layout_manager, G_TYPE_OBJECT);
static void
layout_manager_real_get_preferred_width (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_height,
gfloat *min_width_p,
gfloat *nat_width_p)
{
LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "get_preferred_width");
if (min_width_p)
*min_width_p = 0.0;
if (nat_width_p)
*nat_width_p = 0.0;
}
static void
layout_manager_real_get_preferred_height (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_width,
gfloat *min_height_p,
gfloat *nat_height_p)
{
LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "get_preferred_height");
if (min_height_p)
*min_height_p = 0.0;
if (nat_height_p)
*nat_height_p = 0.0;
}
static void
layout_manager_real_allocate (ClutterLayoutManager *manager,
ClutterContainer *container,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags)
{
LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "allocate");
}
static void
clutter_layout_manager_class_init (ClutterLayoutManagerClass *klass)
{
klass->get_preferred_width = layout_manager_real_get_preferred_width;
klass->get_preferred_height = layout_manager_real_get_preferred_height;
klass->allocate = layout_manager_real_allocate;
}
static void
clutter_layout_manager_init (ClutterLayoutManager *manager)
{
}
/**
* clutter_layout_manager_get_preferred_width:
* @manager: a #ClutterLayoutManager
* @container: the #ClutterContainer using @manager
* @for_height: the height for which the width should be computed, or -1
* @min_width_p: (out) (allow-none): return location for the minimum width
* of the layout, or %NULL
* @nat_width_p: (out) (allow-none): return location for the natural width
* of the layout, or %NULL
*
* Computes the minimum and natural widths of the @container according
* to @manager.
*
* See also clutter_actor_get_preferred_width()
*
* Since: 1.2
*/
void
clutter_layout_manager_get_preferred_width (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_height,
gfloat *min_width_p,
gfloat *nat_width_p)
{
ClutterLayoutManagerClass *klass;
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
klass->get_preferred_width (manager, container, for_height,
min_width_p,
nat_width_p);
}
/**
* clutter_layout_manager_get_preferred_height:
* @manager: a #ClutterLayoutManager
* @container: the #ClutterContainer using @manager
* @for_width: the width for which the height should be computed, or -1
* @min_height_p: (out) (allow-none): return location for the minimum height
* of the layout, or %NULL
* @nat_height_p: (out) (allow-none): return location for the natural height
* of the layout, or %NULL
*
* Computes the minimum and natural heights of the @container according
* to @manager.
*
* See also clutter_actor_get_preferred_height()
*
* Since: 1.2
*/
void
clutter_layout_manager_get_preferred_height (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_width,
gfloat *min_height_p,
gfloat *nat_height_p)
{
ClutterLayoutManagerClass *klass;
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
klass->get_preferred_height (manager, container, for_width,
min_height_p,
nat_height_p);
}
/**
* clutter_layout_manager_allocate:
* @manager: a #ClutterLayoutManager
* @container: the #ClutterContainer using @manager
* @allocation: the #ClutterActorBox containing the allocated area
* of @container
* @flags: the allocation flags
*
* Allocates the children of @container given an area
*
* See also clutter_actor_allocate()
*
* Since: 1.2
*/
void
clutter_layout_manager_allocate (ClutterLayoutManager *manager,
ClutterContainer *container,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags)
{
ClutterLayoutManagerClass *klass;
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (allocation != NULL);
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
klass->allocate (manager, container, allocation, flags);
}

92
clutter/clutter-layout-manager.h Normal file
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@ -0,0 +1,92 @@
#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
#error "Only <clutter/clutter.h> can be included directly."
#endif
#ifndef __CLUTTER_LAYOUT_MANAGER_H__
#define __CLUTTER_LAYOUT_MANAGER_H__
#include <clutter/clutter-actor.h>
#include <clutter/clutter-container.h>
G_BEGIN_DECLS
#define CLUTTER_TYPE_LAYOUT_MANAGER (clutter_layout_manager_get_type ())
#define CLUTTER_LAYOUT_MANAGER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_LAYOUT_MANAGER, ClutterLayoutManager))
#define CLUTTER_IS_LAYOUT_MANAGER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_LAYOUT_MANAGER))
#define CLUTTER_LAYOUT_MANAGER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_LAYOUT_MANAGER, ClutterLayoutManagerClass))
#define CLUTTER_IS_LAYOUT_MANAGER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_LAYOUT_MANAGER))
#define CLUTTER_LAYOUT_MANAGER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_LAYOUT_MANAGER, ClutterLayoutManagerClass))
typedef struct _ClutterLayoutManager ClutterLayoutManager;
typedef struct _ClutterLayoutManagerClass ClutterLayoutManagerClass;
/**
* ClutterLayoutManager:
*
* The #ClutterLayoutManager structure contains only private data
* and should be accessed using the provided API
*
* Since: 1.2
*/
struct _ClutterLayoutManager
{
GObject parent_instance;
};
/**
* ClutterLayoutManagerClass:
*
* The #ClutterLayoutManagerClass structure contains only private
* data and should be accessed using the provided API
*
* Since: 1.2
*/
struct _ClutterLayoutManagerClass
{
GObjectClass parent_class;
void (* get_preferred_width) (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_height,
gfloat *minimum_width_p,
gfloat *natural_width_p);
void (* get_preferred_height) (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_width,
gfloat *minimum_height_p,
gfloat *natural_height_p);
void (* allocate) (ClutterLayoutManager *manager,
ClutterContainer *container,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags);
void (* _clutter_padding_1) (void);
void (* _clutter_padding_2) (void);
void (* _clutter_padding_3) (void);
void (* _clutter_padding_4) (void);
void (* _clutter_padding_5) (void);
void (* _clutter_padding_6) (void);
void (* _clutter_padding_7) (void);
void (* _clutter_padding_8) (void);
};
GType clutter_layout_manager_get_type (void) G_GNUC_CONST;
void clutter_layout_manager_get_preferred_width (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_height,
gfloat *min_width_p,
gfloat *nat_width_p);
void clutter_layout_manager_get_preferred_height (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_width,
gfloat *min_height_p,
gfloat *nat_height_p);
void clutter_layout_manager_allocate (ClutterLayoutManager *manager,
ClutterContainer *container,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags);
G_END_DECLS
#endif /* __CLUTTER_LAYOUT_MANAGER_H__ */

1
clutter/clutter.h
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@ -54,6 +54,7 @@
#include "clutter-group.h"
#include "clutter-interval.h"
#include "clutter-keysyms.h"
#include "clutter-layout-manager.h"
#include "clutter-list-model.h"
#include "clutter-main.h"
#include "clutter-media.h"