[layout] Add initial implementation of LayoutManager
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
parent
4f2bfc003a
commit
d6183e95e5
@ -78,6 +78,7 @@ source_h = \
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$(srcdir)/clutter-group.h \
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$(srcdir)/clutter-interval.h \
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$(srcdir)/clutter-keysyms.h \
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$(srcdir)/clutter-layout-manager.h \
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$(srcdir)/clutter-list-model.h \
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$(srcdir)/clutter-main.h \
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$(srcdir)/clutter-media.h \
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@ -142,6 +143,7 @@ source_c = \
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$(srcdir)/clutter-group.c \
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$(srcdir)/clutter-id-pool.c \
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$(srcdir)/clutter-interval.c \
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$(srcdir)/clutter-layout-manager.c \
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$(srcdir)/clutter-list-model.c \
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$(srcdir)/clutter-main.c \
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clutter-marshal.c \
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180
clutter/clutter-layout-manager.c
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180
clutter/clutter-layout-manager.c
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@ -0,0 +1,180 @@
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/**
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* SECTION:clutter-layout-manager
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* @short_description: Layout managers base class
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*
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* #ClutterLayoutManager is FIXME
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*
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* #ClutterLayoutManager is available since Clutter 1.2
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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-debug.h"
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#include "clutter-layout-manager.h"
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#include "clutter-marshal.h"
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#include "clutter-private.h"
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#define LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED(m,method) G_STMT_START { \
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GObject *_obj = G_OBJECT (m); \
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g_warning ("Layout managers of type %s do not implement " \
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"the ClutterLayoutManager::%s method", \
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G_OBJECT_TYPE_NAME (_obj), \
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(method)); } G_STMT_END
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G_DEFINE_ABSTRACT_TYPE (ClutterLayoutManager, clutter_layout_manager, G_TYPE_OBJECT);
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static void
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layout_manager_real_get_preferred_width (ClutterLayoutManager *manager,
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ClutterContainer *container,
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gfloat for_height,
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gfloat *min_width_p,
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gfloat *nat_width_p)
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{
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LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "get_preferred_width");
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if (min_width_p)
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*min_width_p = 0.0;
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if (nat_width_p)
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*nat_width_p = 0.0;
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}
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static void
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layout_manager_real_get_preferred_height (ClutterLayoutManager *manager,
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ClutterContainer *container,
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gfloat for_width,
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gfloat *min_height_p,
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gfloat *nat_height_p)
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{
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LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "get_preferred_height");
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if (min_height_p)
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*min_height_p = 0.0;
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if (nat_height_p)
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*nat_height_p = 0.0;
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}
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static void
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layout_manager_real_allocate (ClutterLayoutManager *manager,
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ClutterContainer *container,
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const ClutterActorBox *allocation,
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ClutterAllocationFlags flags)
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{
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LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "allocate");
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}
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static void
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clutter_layout_manager_class_init (ClutterLayoutManagerClass *klass)
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{
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klass->get_preferred_width = layout_manager_real_get_preferred_width;
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klass->get_preferred_height = layout_manager_real_get_preferred_height;
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klass->allocate = layout_manager_real_allocate;
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}
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static void
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clutter_layout_manager_init (ClutterLayoutManager *manager)
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{
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}
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/**
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* clutter_layout_manager_get_preferred_width:
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* @manager: a #ClutterLayoutManager
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* @container: the #ClutterContainer using @manager
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* @for_height: the height for which the width should be computed, or -1
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* @min_width_p: (out) (allow-none): return location for the minimum width
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* of the layout, or %NULL
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* @nat_width_p: (out) (allow-none): return location for the natural width
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* of the layout, or %NULL
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*
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* Computes the minimum and natural widths of the @container according
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* to @manager.
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*
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* See also clutter_actor_get_preferred_width()
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*
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* Since: 1.2
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*/
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void
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clutter_layout_manager_get_preferred_width (ClutterLayoutManager *manager,
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ClutterContainer *container,
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gfloat for_height,
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gfloat *min_width_p,
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gfloat *nat_width_p)
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{
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ClutterLayoutManagerClass *klass;
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g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
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g_return_if_fail (CLUTTER_IS_CONTAINER (container));
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klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
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klass->get_preferred_width (manager, container, for_height,
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min_width_p,
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nat_width_p);
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}
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/**
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* clutter_layout_manager_get_preferred_height:
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* @manager: a #ClutterLayoutManager
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* @container: the #ClutterContainer using @manager
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* @for_width: the width for which the height should be computed, or -1
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* @min_height_p: (out) (allow-none): return location for the minimum height
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* of the layout, or %NULL
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* @nat_height_p: (out) (allow-none): return location for the natural height
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* of the layout, or %NULL
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*
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* Computes the minimum and natural heights of the @container according
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* to @manager.
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*
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* See also clutter_actor_get_preferred_height()
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*
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* Since: 1.2
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*/
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void
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clutter_layout_manager_get_preferred_height (ClutterLayoutManager *manager,
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ClutterContainer *container,
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gfloat for_width,
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gfloat *min_height_p,
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gfloat *nat_height_p)
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{
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ClutterLayoutManagerClass *klass;
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g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
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g_return_if_fail (CLUTTER_IS_CONTAINER (container));
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klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
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klass->get_preferred_height (manager, container, for_width,
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min_height_p,
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nat_height_p);
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}
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/**
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* clutter_layout_manager_allocate:
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* @manager: a #ClutterLayoutManager
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* @container: the #ClutterContainer using @manager
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* @allocation: the #ClutterActorBox containing the allocated area
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* of @container
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* @flags: the allocation flags
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*
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* Allocates the children of @container given an area
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*
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* See also clutter_actor_allocate()
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*
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* Since: 1.2
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*/
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void
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clutter_layout_manager_allocate (ClutterLayoutManager *manager,
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ClutterContainer *container,
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const ClutterActorBox *allocation,
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ClutterAllocationFlags flags)
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{
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ClutterLayoutManagerClass *klass;
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g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
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g_return_if_fail (CLUTTER_IS_CONTAINER (container));
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g_return_if_fail (allocation != NULL);
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klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
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klass->allocate (manager, container, allocation, flags);
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}
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92
clutter/clutter-layout-manager.h
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92
clutter/clutter-layout-manager.h
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@ -0,0 +1,92 @@
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#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
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#error "Only <clutter/clutter.h> can be included directly."
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#endif
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#ifndef __CLUTTER_LAYOUT_MANAGER_H__
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#define __CLUTTER_LAYOUT_MANAGER_H__
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#include <clutter/clutter-actor.h>
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#include <clutter/clutter-container.h>
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G_BEGIN_DECLS
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#define CLUTTER_TYPE_LAYOUT_MANAGER (clutter_layout_manager_get_type ())
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#define CLUTTER_LAYOUT_MANAGER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_LAYOUT_MANAGER, ClutterLayoutManager))
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#define CLUTTER_IS_LAYOUT_MANAGER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_LAYOUT_MANAGER))
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#define CLUTTER_LAYOUT_MANAGER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_LAYOUT_MANAGER, ClutterLayoutManagerClass))
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#define CLUTTER_IS_LAYOUT_MANAGER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_LAYOUT_MANAGER))
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#define CLUTTER_LAYOUT_MANAGER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_LAYOUT_MANAGER, ClutterLayoutManagerClass))
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typedef struct _ClutterLayoutManager ClutterLayoutManager;
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typedef struct _ClutterLayoutManagerClass ClutterLayoutManagerClass;
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/**
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* ClutterLayoutManager:
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*
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* The #ClutterLayoutManager structure contains only private data
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* and should be accessed using the provided API
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*
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* Since: 1.2
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*/
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struct _ClutterLayoutManager
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{
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GObject parent_instance;
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};
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/**
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* ClutterLayoutManagerClass:
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*
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* The #ClutterLayoutManagerClass structure contains only private
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* data and should be accessed using the provided API
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*
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* Since: 1.2
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*/
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struct _ClutterLayoutManagerClass
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{
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GObjectClass parent_class;
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void (* get_preferred_width) (ClutterLayoutManager *manager,
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ClutterContainer *container,
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gfloat for_height,
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gfloat *minimum_width_p,
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gfloat *natural_width_p);
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void (* get_preferred_height) (ClutterLayoutManager *manager,
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ClutterContainer *container,
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gfloat for_width,
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gfloat *minimum_height_p,
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gfloat *natural_height_p);
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void (* allocate) (ClutterLayoutManager *manager,
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ClutterContainer *container,
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const ClutterActorBox *allocation,
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ClutterAllocationFlags flags);
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void (* _clutter_padding_1) (void);
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void (* _clutter_padding_2) (void);
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void (* _clutter_padding_3) (void);
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void (* _clutter_padding_4) (void);
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void (* _clutter_padding_5) (void);
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void (* _clutter_padding_6) (void);
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void (* _clutter_padding_7) (void);
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void (* _clutter_padding_8) (void);
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};
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GType clutter_layout_manager_get_type (void) G_GNUC_CONST;
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void clutter_layout_manager_get_preferred_width (ClutterLayoutManager *manager,
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ClutterContainer *container,
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gfloat for_height,
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gfloat *min_width_p,
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gfloat *nat_width_p);
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void clutter_layout_manager_get_preferred_height (ClutterLayoutManager *manager,
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ClutterContainer *container,
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gfloat for_width,
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gfloat *min_height_p,
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gfloat *nat_height_p);
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void clutter_layout_manager_allocate (ClutterLayoutManager *manager,
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ClutterContainer *container,
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const ClutterActorBox *allocation,
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ClutterAllocationFlags flags);
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G_END_DECLS
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#endif /* __CLUTTER_LAYOUT_MANAGER_H__ */
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@ -54,6 +54,7 @@
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#include "clutter-group.h"
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#include "clutter-interval.h"
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#include "clutter-keysyms.h"
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#include "clutter-layout-manager.h"
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#include "clutter-list-model.h"
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#include "clutter-main.h"
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#include "clutter-media.h"
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