137 lines
5.5 KiB
C
137 lines
5.5 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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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2006 OpenedHand
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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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* ClutterLayout: interface to be implemented by actors providing
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* extended layouts.
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*
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* Author: Emmanuele Bassi <ebassi@openedhand.com>
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*/
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#ifndef __CLUTTER_LAYOUT_H__
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#define __CLUTTER_LAYOUT_H__
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#include <clutter/clutter-actor.h>
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G_BEGIN_DECLS
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#define CLUTTER_TYPE_LAYOUT (clutter_layout_get_type ())
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#define CLUTTER_LAYOUT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_LAYOUT, ClutterLayout))
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#define CLUTTER_IS_LAYOUT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_LAYOUT))
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#define CLUTTER_LAYOUT_GET_IFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), CLUTTER_TYPE_LAYOUT, ClutterLayoutIface))
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/**
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* ClutterLayoutFlags
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* @CLUTTER_LAYOUT_NONE: No layout (default behaviour)
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* @CLUTTER_LAYOUT_WIDTH_FOR_HEIGHT: Width-for-height
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* @CLUTTER_LAYOUT_HEIGHT_FOR_WIDTH: Height-for-width
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* @CLUTTER_LAYOUT_NATURAL: Natural size request
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* @CLUTTER_LAYOUT_TUNABLE: Tunable size request
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*
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* Type of layouts supported by an actor.
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*
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* Since: 0.4
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*/
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typedef enum {
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CLUTTER_LAYOUT_NONE = 0,
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CLUTTER_LAYOUT_WIDTH_FOR_HEIGHT = 1 << 0,
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CLUTTER_LAYOUT_HEIGHT_FOR_WIDTH = 1 << 1,
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CLUTTER_LAYOUT_NATURAL = 1 << 2,
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CLUTTER_LAYOUT_TUNABLE = 1 << 3
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} ClutterLayoutFlags;
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typedef struct _ClutterLayout ClutterLayout; /* dummy */
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typedef struct _ClutterLayoutIface ClutterLayoutIface;
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/**
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* ClutterLayoutIface:
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* @get_layout_flags: Retrieve the layout mode used by the actor
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* @width_for_height: Compute width for a given height
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* @height_for_width: Compute height for a given width
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* @natural_request: Natural size of an actor
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* @tune_request: Iterative size allocation
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*
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* Interface for extended layout support in actors.
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*
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* Since: 0.4
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*/
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struct _ClutterLayoutIface
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{
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/*< private >*/
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GTypeInterface g_iface;
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/*< public >*/
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/* Retrieve the layout mode used by the actor */
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ClutterLayoutFlags (* get_layout_flags) (ClutterLayout *layout);
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/* Width-for-Height and Height-for-Width: one size is known
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* and the other is queried. useful for labels and unidirectional
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* containers, like vertical and horizontal boxes.
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*/
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void (* width_for_height) (ClutterLayout *layout,
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ClutterUnit *width,
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ClutterUnit height);
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void (* height_for_width) (ClutterLayout *layout,
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ClutterUnit width,
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ClutterUnit *height);
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/* Natural size request: the actor is queried for its natural
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* size and the container can decide to either scale the actor
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* or to resize itself to make it fit. useful for textures
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* or shapes.
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*/
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void (* natural_request) (ClutterLayout *layout,
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ClutterUnit *width,
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ClutterUnit *height);
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/* Iterative allocation: the actor is iteratively queried
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* for its size, until it finds it.
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*/
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gboolean (* tune_request) (ClutterLayout *layout,
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ClutterUnit given_width,
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ClutterUnit given_height,
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ClutterUnit *width,
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ClutterUnit *height);
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};
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GType clutter_layout_get_type (void) G_GNUC_CONST;
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ClutterLayoutFlags clutter_layout_get_layout_flags (ClutterLayout *layout);
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void clutter_layout_width_for_height (ClutterLayout *layout,
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gint *width,
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gint height);
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void clutter_layout_height_for_width (ClutterLayout *layout,
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gint width,
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gint *height);
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void clutter_layout_natural_request (ClutterLayout *layout,
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gint *width,
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gint *height);
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void clutter_layout_tune_request (ClutterLayout *layout,
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gint given_width,
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gint given_height,
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gint *width,
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gint *height);
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G_END_DECLS
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#endif /* __CLUTTER_LAYOUT_H__ */
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