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actor: Add basic automatic expand flags

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The :x-expand and :y-expand flags on ClutterActor are used to signal
that an actor should expand horizontally and/or vertically - i.e. that
its parent's layout management policy should try to assign extra space
to the actor when allocating it.

The expand flags are automatic: when set on a leaf node in the actor
tree, they will bubble up through the parent and grandparents up to the
top level actor; during allocation, the actors with children will lazily
compute whether their children needs to expand.
This commit is contained in:
Emmanuele Bassi 2012-03-27 14:53:27 +01:00
parent 217c4e7ba0
commit 90032e0019
4 changed files with 444 additions and 7 deletions
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14
clutter/clutter-actor-private.h
View File

@ -147,15 +147,14 @@ struct _SizeRequest
/*< private >
* ClutterLayoutInfo:
* @fixed_x: the fixed position of the actor, set using clutter_actor_set_x()
* @fixed_y: the fixed position of the actor, set using clutter_actor_set_y()
* @fixed_pos: the fixed position of the actor
* @margin: the composed margin of the actor
* @x_align: the horizontal alignment, if the actor expands horizontally
* @y_align: the vertical alignment, if the actor expands vertically
* @min_width: the minimum width, set using clutter_actor_set_min_width()
* @min_height: the minimum height, set using clutter_actor_set_min_height()
* @natural_width: the natural width, set using clutter_actor_set_natural_width()
* @natural_height: the natural height, set using clutter_actor_set_natural_height()
* @x_expand: whether the actor should expand horizontally
* @y_expand: whether the actor should expand vertically
* @minimum: the fixed minimum size
* @natural: the fixed natural size
*
* Ancillary layout information for an actor.
*/
@ -169,6 +168,9 @@ struct _ClutterLayoutInfo
guint x_align : 4;
guint y_align : 4;
guint x_expand : 1;
guint y_expand : 1;
ClutterSize minimum;
ClutterSize natural;
};

417
clutter/clutter-actor.c
View File

@ -771,6 +771,11 @@ struct _ClutterActorPrivate
guint is_dirty : 1;
guint bg_color_set : 1;
guint content_box_valid : 1;
guint x_expand_set : 1;
guint y_expand_set : 1;
guint needs_compute_expand : 1;
guint needs_x_expand : 1;
guint needs_y_expand : 1;
};
enum
@ -864,6 +869,8 @@ enum
PROP_LAYOUT_MANAGER,
PROP_X_EXPAND,
PROP_Y_EXPAND,
PROP_X_ALIGN,
PROP_Y_ALIGN,
PROP_MARGIN_TOP,
@ -982,6 +989,8 @@ static inline void clutter_actor_set_background_color_internal (ClutterActor *se
static void on_layout_manager_changed (ClutterLayoutManager *manager,
ClutterActor *self);
static inline void clutter_actor_queue_compute_expand (ClutterActor *self);
/* Helper macro which translates by the anchor coord, applies the
given transformation and then translates back */
#define TRANSFORM_ABOUT_ANCHOR_COORD(a,m,c,_transform) G_STMT_START { \
@ -1606,6 +1615,17 @@ clutter_actor_show (ClutterActor *self)
set_show_on_set_parent (self, TRUE);
/* if we're showing a child that needs to expand, or may
* expand, then we need to recompute the expand flags for
* its parent as well
*/
if (priv->needs_compute_expand ||
priv->needs_x_expand ||
priv->needs_y_expand)
{
clutter_actor_queue_compute_expand (self);
}
g_signal_emit (self, actor_signals[SHOW], 0);
g_object_notify_by_pspec (G_OBJECT (self), obj_props[PROP_VISIBLE]);
@ -1701,6 +1721,17 @@ clutter_actor_hide (ClutterActor *self)
set_show_on_set_parent (self, FALSE);
/* if we're hiding a child that needs to expand, or may
* expand, then we need to recompute the expand flags for
* its parent as well
*/
if (priv->needs_compute_expand ||
priv->needs_x_expand ||
priv->needs_y_expand)
{
clutter_actor_queue_compute_expand (self);
}
g_signal_emit (self, actor_signals[HIDE], 0);
g_object_notify_by_pspec (G_OBJECT (self), obj_props[PROP_VISIBLE]);
@ -3901,6 +3932,19 @@ clutter_actor_remove_child_internal (ClutterActor *self,
self->priv->age += 1;
/* if the child that got removed was visible and set to
* expand then we want to reset the parent's state in
* case the child was the only thing that was making it
* expand.
*/
if (CLUTTER_ACTOR_IS_VISIBLE (child) &&
(child->priv->needs_compute_expand ||
child->priv->needs_x_expand ||
child->priv->needs_y_expand))
{
clutter_actor_queue_compute_expand (self);
}
/* clutter_actor_reparent() will emit ::parent-set for us */
if (emit_parent_set && !CLUTTER_ACTOR_IN_REPARENT (child))
g_signal_emit (child, actor_signals[PARENT_SET], 0, self);
@ -4581,6 +4625,14 @@ clutter_actor_set_property (GObject *object,
clutter_actor_set_layout_manager (actor, g_value_get_object (value));
break;
case PROP_X_EXPAND:
clutter_actor_set_x_expand (actor, g_value_get_boolean (value));
break;
case PROP_Y_EXPAND:
clutter_actor_set_y_expand (actor, g_value_get_boolean (value));
break;
case PROP_X_ALIGN:
clutter_actor_set_x_align (actor, g_value_get_enum (value));
break;
@ -4979,6 +5031,24 @@ clutter_actor_get_property (GObject *object,
g_value_set_object (value, priv->layout_manager);
break;
case PROP_X_EXPAND:
{
const ClutterLayoutInfo *info;
info = _clutter_actor_get_layout_info_or_defaults (actor);
g_value_set_boolean (value, info->x_expand);
}
break;
case PROP_Y_EXPAND:
{
const ClutterLayoutInfo *info;
info = _clutter_actor_get_layout_info_or_defaults (actor);
g_value_set_boolean (value, info->y_expand);
}
break;
case PROP_X_ALIGN:
{
const ClutterLayoutInfo *info;
@ -6367,12 +6437,44 @@ clutter_actor_class_init (ClutterActorClass *klass)
CLUTTER_TYPE_LAYOUT_MANAGER,
CLUTTER_PARAM_READWRITE);
/**
* ClutterActor:x-expand:
*
* Whether a layout manager should assign more space to the actor on
* the X axis.
*
* Since: 1.12
*/
obj_props[PROP_X_EXPAND] =
g_param_spec_boolean ("x-expand",
P_("X Expand"),
P_("Whether extra horizontal space should be assigned to the actor"),
FALSE,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS);
/**
* ClutterActor:y-expand:
*
* Whether a layout manager should assign more space to the actor on
* the Y axis.
*
* Since: 1.12
*/
obj_props[PROP_Y_EXPAND] =
g_param_spec_boolean ("y-expand",
P_("Y Expand"),
P_("Whether extra vertical space should be assigned to the actor"),
FALSE,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS);
/**
* ClutterActor:x-align:
*
* The alignment of an actor on the X axis, if the actor has been given
* extra space for its allocation.
* extra space for its allocation. See also the #ClutterActor:x-expand
* property.
*
* Since: 1.10
*/
@ -7218,6 +7320,15 @@ clutter_actor_init (ClutterActor *self)
priv->content_gravity = CLUTTER_CONTENT_GRAVITY_RESIZE_FILL;
priv->min_filter = CLUTTER_SCALING_FILTER_LINEAR;
priv->mag_filter = CLUTTER_SCALING_FILTER_LINEAR;
/* this flag will be set to TRUE if the actor gets a child
* or if the [xy]-expand flags are explicitly set; until
* then, the actor does not need to expand.
*
* this also allows us to avoid computing the expand flag
* when building up a scene.
*/
priv->needs_compute_expand = FALSE;
}
/**
@ -11255,6 +11366,23 @@ clutter_actor_add_child_internal (ClutterActor *self,
if (self->priv->internal_child)
CLUTTER_SET_PRIVATE_FLAGS (child, CLUTTER_INTERNAL_CHILD);
/* children may cause their parent to expand, if they are set
* to expand; if a child is not expanded then it cannot change
* its parent's state. any further change later on will queue
* an expand state check.
*
* this check, with the initial state of the needs_compute_expand
* flag set to FALSE, should avoid recomputing the expand flags
* state while building the actor tree.
*/
if (CLUTTER_ACTOR_IS_VISIBLE (child) &&
(child->priv->needs_compute_expand ||
child->priv->needs_x_expand ||
child->priv->needs_y_expand))
{
clutter_actor_queue_compute_expand (self);
}
/* clutter_actor_reparent() will emit ::parent-set for us */
if (emit_parent_set && !CLUTTER_ACTOR_IN_REPARENT (child))
g_signal_emit (child, actor_signals[PARENT_SET], 0, NULL);
@ -16028,6 +16156,7 @@ static const ClutterLayoutInfo default_layout_info = {
{ 0, 0, 0, 0 }, /* margin */
CLUTTER_ACTOR_ALIGN_FILL, /* x-align */
CLUTTER_ACTOR_ALIGN_FILL, /* y-align */
FALSE, FALSE, /* expand */
CLUTTER_SIZE_INIT_ZERO, /* minimum */
CLUTTER_SIZE_INIT_ZERO, /* natural */
};
@ -18092,3 +18221,289 @@ clutter_actor_get_content_scaling_filters (ClutterActor *self,
if (mag_filter != NULL)
*mag_filter = self->priv->mag_filter;
}
/*
* clutter_actor_queue_compute_expand:
* @self: a #ClutterActor
*
* Invalidates the needs_x_expand and needs_y_expand flags on @self
* and its parents up to the top-level actor.
*
* This function also queues a relayout if anything changed.
*/
static inline void
clutter_actor_queue_compute_expand (ClutterActor *self)
{
ClutterActor *parent;
gboolean changed;
if (self->priv->needs_compute_expand)
return;
changed = FALSE;
parent = self;
while (parent != NULL)
{
if (!parent->priv->needs_compute_expand)
{
parent->priv->needs_compute_expand = TRUE;
changed = TRUE;
}
parent = parent->priv->parent;
}
if (changed)
clutter_actor_queue_relayout (self);
}
/**
* clutter_actor_set_x_expand:
* @self: a #ClutterActor
* @expand: whether the actor should expand horizontally
*
* Sets whether a #ClutterActor should expand horizontally; this means
* that layout manager should allocate extra space for the actor, if
* possible.
*
* Setting an actor to expand will also make all its parent expand, so
* that it's possible to build an actor tree and only set this flag on
* its leaves and not on every single actor.
*
* Since: 1.12
*/
void
clutter_actor_set_x_expand (ClutterActor *self,
gboolean expand)
{
ClutterLayoutInfo *info;
g_return_if_fail (CLUTTER_IS_ACTOR (self));
expand = !!expand;
info = _clutter_actor_get_layout_info (self);
if (info->x_expand != expand)
{
info->x_expand = expand;
self->priv->x_expand_set = TRUE;
clutter_actor_queue_compute_expand (self);
g_object_notify_by_pspec (G_OBJECT (self),
obj_props[PROP_X_EXPAND]);
}
}
/**
* clutter_actor_get_x_expand:
* @self: a #ClutterActor
*
* Retrieves the value set with clutter_actor_set_x_expand().
*
* See also: clutter_actor_needs_x_expand()
*
* Return value: %TRUE if the actor has been set to expand
*
* Since: 1.12
*/
gboolean
clutter_actor_get_x_expand (ClutterActor *self)
{
g_return_val_if_fail (CLUTTER_IS_ACTOR (self), FALSE);
return _clutter_actor_get_layout_info_or_defaults (self)->x_expand;
}
/**
* clutter_actor_set_y_expand:
* @self: a #ClutterActor
* @expand: whether the actor should expand vertically
*
* Sets whether a #ClutterActor should expand horizontally; this means
* that layout manager should allocate extra space for the actor, if
* possible.
*
* Setting an actor to expand will also make all its parent expand, so
* that it's possible to build an actor tree and only set this flag on
* its leaves and not on every single actor.
*
* Since: 1.12
*/
void
clutter_actor_set_y_expand (ClutterActor *self,
gboolean expand)
{
ClutterLayoutInfo *info;
g_return_if_fail (CLUTTER_IS_ACTOR (self));
expand = !!expand;
info = _clutter_actor_get_layout_info (self);
if (info->y_expand != expand)
{
info->y_expand = expand;
self->priv->y_expand_set = TRUE;
clutter_actor_queue_compute_expand (self);
g_object_notify_by_pspec (G_OBJECT (self),
obj_props[PROP_Y_EXPAND]);
}
}
/**
* clutter_actor_get_y_expand:
* @self: a #ClutterActor
*
* Retrieves the value set with clutter_actor_set_y_expand().
*
* See also: clutter_actor_needs_y_expand()
*
* Return value: %TRUE if the actor has been set to expand
*
* Since: 1.12
*/
gboolean
clutter_actor_get_y_expand (ClutterActor *self)
{
g_return_val_if_fail (CLUTTER_IS_ACTOR (self), FALSE);
return _clutter_actor_get_layout_info_or_defaults (self)->y_expand;
}
static void
clutter_actor_compute_expand_recursive (ClutterActor *self,
gboolean *x_expand_p,
gboolean *y_expand_p)
{
ClutterActorIter iter;
ClutterActor *child;
gboolean x_expand, y_expand;
x_expand = y_expand = FALSE;
clutter_actor_iter_init (&iter, self);
while (clutter_actor_iter_next (&iter, &child))
{
x_expand = x_expand || clutter_actor_needs_x_expand (child);
y_expand = y_expand || clutter_actor_needs_y_expand (child);
}
*x_expand_p = x_expand;
*y_expand_p = y_expand;
}
static void
clutter_actor_compute_expand (ClutterActor *self)
{
if (self->priv->needs_compute_expand)
{
const ClutterLayoutInfo *info;
gboolean x_expand, y_expand;
info = _clutter_actor_get_layout_info_or_defaults (self);
if (self->priv->x_expand_set)
x_expand = info->x_expand;
else
x_expand = FALSE;
if (self->priv->y_expand_set)
y_expand = info->y_expand;
else
y_expand = FALSE;
/* we don't need to recurse down to the children if the
* actor has been forcibly set to expand
*/
if (!(self->priv->x_expand_set && self->priv->y_expand_set))
{
if (self->priv->n_children != 0)
{
gboolean *x_expand_p, *y_expand_p;
gboolean ignored = FALSE;
x_expand_p = self->priv->x_expand_set ? &ignored : &x_expand;
y_expand_p = self->priv->y_expand_set ? &ignored : &y_expand;
clutter_actor_compute_expand_recursive (self,
x_expand_p,
y_expand_p);
}
}
self->priv->needs_compute_expand = FALSE;
self->priv->needs_x_expand = (x_expand != FALSE);
self->priv->needs_y_expand = (y_expand != FALSE);
}
}
/**
* clutter_actor_needs_x_expand:
* @self: a #ClutterActor
*
* Checks whether an actor, or any of its children, is set to expand
* horizontally.
*
* This function should only be called by layout managers that can
* assign extra space to their children.
*
* If you want to know whether the actor was explicitly set to expand,
* use clutter_actor_get_y_expand().
*
* Return value: %TRUE if the actor should expand
*
* Since: 1.12
*/
gboolean
clutter_actor_needs_x_expand (ClutterActor *self)
{
g_return_val_if_fail (CLUTTER_IS_ACTOR (self), FALSE);
if (!CLUTTER_ACTOR_IS_VISIBLE (self))
return FALSE;
if (CLUTTER_ACTOR_IN_DESTRUCTION (self))
return FALSE;
clutter_actor_compute_expand (self);
return self->priv->needs_x_expand;
}
/**
* clutter_actor_needs_y_expand:
* @self: a #ClutterActor
*
* Checks whether an actor, or any of its children, is set to expand
* vertically.
*
* This function should only be called by layout managers that can
* assign extra space to their children.
*
* If you want to know whether the actor was explicitly set to expand,
* use clutter_actor_get_y_expand().
*
* Return value: %TRUE if the actor should expand
*
* Since: 1.12
*/
gboolean
clutter_actor_needs_y_expand (ClutterActor *self)
{
g_return_val_if_fail (CLUTTER_IS_ACTOR (self), FALSE);
if (!CLUTTER_ACTOR_IS_VISIBLE (self))
return FALSE;
if (CLUTTER_ACTOR_IN_DESTRUCTION (self))
return FALSE;
clutter_actor_compute_expand (self);
return self->priv->needs_x_expand;
}

14
clutter/clutter-actor.h
View File

@ -439,6 +439,20 @@ void clutter_actor_set_margin
CLUTTER_AVAILABLE_IN_1_10
void clutter_actor_get_margin (ClutterActor *self,
ClutterMargin *margin);
CLUTTER_AVAILABLE_IN_1_12
void clutter_actor_set_x_expand (ClutterActor *self,
gboolean expand);
CLUTTER_AVAILABLE_IN_1_12
gboolean clutter_actor_get_x_expand (ClutterActor *self);
CLUTTER_AVAILABLE_IN_1_12
void clutter_actor_set_y_expand (ClutterActor *self,
gboolean expand);
CLUTTER_AVAILABLE_IN_1_12
gboolean clutter_actor_get_y_expand (ClutterActor *self);
CLUTTER_AVAILABLE_IN_1_12
gboolean clutter_actor_needs_x_expand (ClutterActor *self);
CLUTTER_AVAILABLE_IN_1_12
gboolean clutter_actor_needs_y_expand (ClutterActor *self);
/* Paint */
void clutter_actor_set_clip (ClutterActor *self,

6
clutter/clutter.symbols
View File

@ -152,8 +152,10 @@ clutter_actor_get_transition
clutter_actor_get_type
clutter_actor_get_width
clutter_actor_get_x_align
clutter_actor_get_x_expand
clutter_actor_get_x
clutter_actor_get_y_align
clutter_actor_get_y_expand
clutter_actor_get_y
clutter_actor_get_z_rotation_gravity
clutter_actor_grab_key_focus
@ -190,6 +192,8 @@ clutter_actor_meta_set_name
clutter_actor_move_anchor_point
clutter_actor_move_anchor_point_from_gravity
clutter_actor_move_by
clutter_actor_needs_x_expand
clutter_actor_needs_y_expand
clutter_actor_new
clutter_actor_paint
clutter_actor_pop_internal
@ -260,8 +264,10 @@ clutter_actor_set_size
clutter_actor_set_text_direction
clutter_actor_set_width
clutter_actor_set_x_align
clutter_actor_set_x_expand
clutter_actor_set_x
clutter_actor_set_y_align
clutter_actor_set_y_expand
clutter_actor_set_y
clutter_actor_set_z_rotation_from_gravity
clutter_actor_should_pick_paint