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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/**
* SECTION:shell-stack
* @short_description: Pure "Z-axis" container class
*
* A #ShellStack draws its children on top of each other,
* aligned to the top left. It will be sized in width/height
* according to the largest such dimension of its children, and
* all children will be allocated that size. This differs
* from #ClutterGroup which allocates its children their natural
* size, even if that would overflow the size allocated to the stack.
*/
#include "config.h"
#include "shell-stack.h"
struct _ShellStack
{
StWidget parent;
};
G_DEFINE_TYPE (ShellStack, shell_stack, ST_TYPE_WIDGET);
static void
shell_stack_allocate (ClutterActor *self,
const ClutterActorBox *box)
{
StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (self));
ClutterActorBox content_box;
ClutterActor *child;
clutter_actor_set_allocation (self, box);
st_theme_node_get_content_box (theme_node, box, &content_box);
for (child = clutter_actor_get_first_child (self);
child != NULL;
child = clutter_actor_get_next_sibling (child))
{
ClutterActorBox child_box = content_box;
clutter_actor_allocate (child, &child_box);
}
}
static void
shell_stack_get_preferred_height (ClutterActor *actor,
gfloat for_width,
gfloat *min_height_p,
gfloat *natural_height_p)
{
StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (actor));
gboolean first = TRUE;
float min = 0, natural = 0;
ClutterActor *child;
st_theme_node_adjust_for_width (theme_node, &for_width);
for (child = clutter_actor_get_first_child (actor);
child != NULL;
child = clutter_actor_get_next_sibling (child))
{
float child_min, child_natural;
clutter_actor_get_preferred_height (child,
for_width,
&child_min,
&child_natural);
if (first)
{
first = FALSE;
min = child_min;
natural = child_natural;
}
else
{
if (child_min > min)
min = child_min;
if (child_natural > natural)
natural = child_natural;
}
}
if (min_height_p)
*min_height_p = min;
if (natural_height_p)
*natural_height_p = natural;
st_theme_node_adjust_preferred_height (theme_node, min_height_p, natural_height_p);
}
static void
shell_stack_get_preferred_width (ClutterActor *actor,
gfloat for_height,
gfloat *min_width_p,
gfloat *natural_width_p)
{
StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (actor));
gboolean first = TRUE;
float min = 0, natural = 0;
ClutterActor *child;
st_theme_node_adjust_for_height (theme_node, &for_height);
for (child = clutter_actor_get_first_child (actor);
child != NULL;
child = clutter_actor_get_next_sibling (child))
{
float child_min, child_natural;
clutter_actor_get_preferred_width (child,
for_height,
&child_min,
&child_natural);
if (first)
{
first = FALSE;
min = child_min;
natural = child_natural;
}
else
{
if (child_min > min)
min = child_min;
if (child_natural > natural)
natural = child_natural;
}
}
if (min_width_p)
*min_width_p = min;
if (natural_width_p)
*natural_width_p = natural;
st_theme_node_adjust_preferred_width (theme_node, min_width_p, natural_width_p);
}
static gboolean
shell_stack_navigate_focus (StWidget *widget,
ClutterActor *from,
StDirectionType direction)
{
ClutterActor *top_actor;
/* If the stack is itself focusable, then focus into or out of
* it, as appropriate.
*/
if (st_widget_get_can_focus (widget))
{
if (from && clutter_actor_contains (CLUTTER_ACTOR (widget), from))
return FALSE;
if (clutter_actor_is_mapped (CLUTTER_ACTOR (widget)))
{
clutter_actor_grab_key_focus (CLUTTER_ACTOR (widget));
return TRUE;
}
else
{
return FALSE;
}
}
top_actor = clutter_actor_get_last_child (CLUTTER_ACTOR (widget));
while (top_actor && !clutter_actor_is_visible (top_actor))
top_actor = clutter_actor_get_previous_sibling (top_actor);
if (ST_IS_WIDGET (top_actor))
return st_widget_navigate_focus (ST_WIDGET (top_actor), from, direction, FALSE);
else
return FALSE;
}
static void
shell_stack_class_init (ShellStackClass *klass)
{
ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
StWidgetClass *widget_class = ST_WIDGET_CLASS (klass);
actor_class->get_preferred_width = shell_stack_get_preferred_width;
actor_class->get_preferred_height = shell_stack_get_preferred_height;
actor_class->allocate = shell_stack_allocate;
widget_class->navigate_focus = shell_stack_navigate_focus;
}
static void
shell_stack_init (ShellStack *actor)
{
}
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