d096a3c791
If a sub-class of LayoutManager wishes to implement a parametrized layout policy it also needs a way to notify the container using the layout manager that the layout has changed. We cannot do it directly and automatically from the LayoutManager because a) it has no back link to the actor that it is using it and b) it can be attached to multiple actors. This is a job for <cue raising dramatic music> signals! By adding ClutterLayoutManager::layout-changed (and its relative emitted function) we can notify actors using the layout manager that the layout parameters have been changed, and thus they should queue a relayout.
137 lines
5.8 KiB
C
137 lines
5.8 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Copyright (C) 2009 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Author:
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* Emmanuele Bassi <ebassi@linux.intel.com>
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*/
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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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/*< private >*/
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GInitiallyUnowned parent_instance;
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};
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/**
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* ClutterLayoutManagerClass:
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* @get_preferred_width: virtual function; override to provide a preferred
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* width for the layout manager. See also the get_preferred_width()
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* virtual function in #ClutterActor
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* @get_preferred_height: virtual function; override to provide a preferred
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* height for the layout manager. See also the get_preferred_height()
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* virtual function in #ClutterActor
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* @allocate: virtual function; override to allocate the children of the
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* layout manager. See also the allocate() virtual function in
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* #ClutterActor
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* @layout_changed: class handler for the #ClutterLayoutManager::layout-changed
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* signal
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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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/*< private >*/
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GInitiallyUnownedClass parent_class;
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/*< public >*/
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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 (* layout_changed) (ClutterLayoutManager *manager);
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/*< private >*/
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/* padding for future expansion */
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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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void clutter_layout_manager_layout_changed (ClutterLayoutManager *manager);
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G_END_DECLS
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#endif /* __CLUTTER_LAYOUT_MANAGER_H__ */
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