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[layout] Add Fixed layout manager
The FixedLayout layout manager object implements the same layout policy of ClutterGroup.
This commit is contained in:
Emmanuele Bassi
parent
141a155690
commit
6d4cc13f7c
@ -75,6 +75,7 @@ source_h = \
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$(srcdir)/clutter-event.h \
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$(srcdir)/clutter-feature.h \
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$(srcdir)/clutter-fixed.h \
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$(srcdir)/clutter-fixed-layout.h \
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$(srcdir)/clutter-frame-source.h \
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$(srcdir)/clutter-group.h \
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$(srcdir)/clutter-interval.h \
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@ -141,6 +142,7 @@ source_c = \
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$(srcdir)/clutter-event.c \
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$(srcdir)/clutter-feature.c \
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$(srcdir)/clutter-fixed.c \
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$(srcdir)/clutter-fixed-layout.c \
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$(srcdir)/clutter-frame-source.c \
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$(srcdir)/clutter-group.c \
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$(srcdir)/clutter-id-pool.c \
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217
clutter/clutter-fixed-layout.c
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217
clutter/clutter-fixed-layout.c
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@ -0,0 +1,217 @@
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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-fixed-layout.h"
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#include "clutter-private.h"
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G_DEFINE_TYPE (ClutterFixedLayout,
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clutter_fixed_layout,
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CLUTTER_TYPE_LAYOUT_MANAGER);
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static void
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clutter_fixed_layout_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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GList *children, *l;
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gdouble min_left, min_right;
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gdouble natural_left, natural_right;
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min_left = 0;
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min_right = 0;
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natural_left = 0;
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natural_right = 0;
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children = clutter_container_get_children (container);
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for (l = children; l != NULL; l = l->next)
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{
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ClutterActor *child = l->data;
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gfloat child_x, child_min, child_natural;
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child_x = clutter_actor_get_x (child);
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clutter_actor_get_preferred_size (child,
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&child_min, NULL,
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&child_natural, NULL);
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if (l == children)
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{
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/* First child */
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min_left = child_x;
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natural_left = child_x;
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min_right = min_left + child_min;
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natural_right = natural_left + child_natural;
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}
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else
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{
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/* Union of extents with previous children */
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if (child_x < min_left)
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min_left = child_x;
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if (child_x < natural_left)
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natural_left = child_x;
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if (child_x + child_min > min_right)
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min_right = child_x + child_min;
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if (child_x + child_natural > natural_right)
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natural_right = child_x + child_natural;
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}
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}
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g_list_free (children);
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/* The preferred size is defined as the width and height we want starting
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* from our origin, since our allocation will set the origin; so we now
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* need to remove any part of the request that is to the left of the origin.
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*/
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if (min_left < 0)
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min_left = 0;
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if (natural_left < 0)
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natural_left = 0;
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if (min_right < 0)
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min_right = 0;
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if (natural_right < 0)
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natural_right = 0;
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g_assert (min_right >= min_left);
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g_assert (natural_right >= natural_left);
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if (min_width_p)
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*min_width_p = min_right - min_left;
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if (nat_width_p)
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*nat_width_p = natural_right - min_left;
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}
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static void
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clutter_fixed_layout_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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GList *children, *l;
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gdouble min_top, min_bottom;
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gdouble natural_top, natural_bottom;
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min_top = 0;
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min_bottom = 0;
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natural_top = 0;
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natural_bottom = 0;
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children = clutter_container_get_children (container);
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for (l = children; l != NULL; l = l->next)
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{
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ClutterActor *child = l->data;
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gfloat child_y, child_min, child_natural;
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child_y = clutter_actor_get_y (child);
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clutter_actor_get_preferred_size (child,
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NULL, &child_min,
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NULL, &child_natural);
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if (l == children)
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{
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/* First child */
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min_top = child_y;
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natural_top = child_y;
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min_bottom = min_top + child_min;
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natural_bottom = natural_top + child_natural;
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}
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else
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{
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/* Union of extents with previous children */
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if (child_y < min_top)
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min_top = child_y;
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if (child_y < natural_top)
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natural_top = child_y;
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if (child_y + child_min > min_bottom)
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min_bottom = child_y + child_min;
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if (child_y + child_natural > natural_bottom)
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natural_bottom = child_y + child_natural;
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}
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}
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g_list_free (children);
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/* The preferred size is defined as the width and height we want starting
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* from our origin, since our allocation will set the origin; so we now
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* need to remove any part of the request that is above the origin.
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*/
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if (min_top < 0)
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min_top = 0;
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if (natural_top < 0)
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natural_top = 0;
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if (min_bottom < 0)
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min_bottom = 0;
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if (natural_bottom < 0)
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natural_bottom = 0;
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g_assert (min_bottom >= min_top);
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g_assert (natural_bottom >= natural_top);
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if (min_height_p)
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*min_height_p = min_bottom - min_top;
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if (nat_height_p)
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*nat_height_p = natural_bottom - min_top;
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}
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static void
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clutter_fixed_layout_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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GList *children, *l;
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children = clutter_container_get_children (container);
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for (l = children; l != NULL; l = l->next)
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{
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ClutterActor *child = l->data;
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clutter_actor_allocate_preferred_size (child, flags);
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}
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g_list_free (children);
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}
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static void
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clutter_fixed_layout_class_init (ClutterFixedLayoutClass *klass)
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{
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ClutterLayoutManagerClass *manager_class =
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CLUTTER_LAYOUT_MANAGER_CLASS (klass);
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manager_class->get_preferred_width =
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clutter_fixed_layout_get_preferred_width;
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manager_class->get_preferred_height =
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clutter_fixed_layout_get_preferred_height;
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manager_class->allocate = clutter_fixed_layout_allocate;
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}
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static void
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clutter_fixed_layout_init (ClutterFixedLayout *self)
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{
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}
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ClutterLayoutManager *
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clutter_fixed_layout_new (void)
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{
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return g_object_new (CLUTTER_TYPE_FIXED_LAYOUT, NULL);
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}
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38
clutter/clutter-fixed-layout.h
Normal file
38
clutter/clutter-fixed-layout.h
Normal file
@ -0,0 +1,38 @@
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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_FIXED_LAYOUT_H__
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#define __CLUTTER_FIXED_LAYOUT_H__
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#include <clutter/clutter-layout-manager.h>
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G_BEGIN_DECLS
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#define CLUTTER_TYPE_FIXED_LAYOUT (clutter_fixed_layout_get_type ())
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#define CLUTTER_FIXED_LAYOUT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_FIXED_LAYOUT, ClutterFixedLayout))
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#define CLUTTER_IS_FIXED_LAYOUT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_FIXED_LAYOUT))
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#define CLUTTER_FIXED_LAYOUT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_FIXED_LAYOUT, ClutterFixedLayoutClass))
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#define CLUTTER_IS_FIXED_LAYOUT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_FIXED_LAYOUT))
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#define CLUTTER_FIXED_LAYOUT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_FIXED_LAYOUT, ClutterFixedLayoutClass))
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typedef struct _ClutterFixedLayout ClutterFixedLayout;
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typedef struct _ClutterFixedLayoutClass ClutterFixedLayoutClass;
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struct _ClutterFixedLayout
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{
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ClutterLayoutManager parent_instance;
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};
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struct _ClutterFixedLayoutClass
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{
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ClutterLayoutManagerClass parent_class;
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};
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GType clutter_fixed_layout_get_type (void) G_GNUC_CONST;
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ClutterLayoutManager *clutter_fixed_layout_new (void);
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G_END_DECLS
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#endif /* __CLUTTER_FIXED_LAYOUT_H__ */
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@ -51,6 +51,7 @@
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#include "clutter-container.h"
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#include "clutter-event.h"
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#include "clutter-feature.h"
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#include "clutter-fixed-layout.h"
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#include "clutter-frame-source.h"
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#include "clutter-group.h"
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#include "clutter-interval.h"
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