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Diffstat (limited to 'src/shell-stack.c')
| -rw-r--r-- | src/shell-stack.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/src/shell-stack.c b/src/shell-stack.c new file mode 100644 index 0000000..79841e0 --- /dev/null +++ b/src/shell-stack.c @@ -0,0 +1,196 @@ +/* -*- 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) +{ +} |