IO_METHOD(IoClutterActor, getFixedPosition) {
return IOBOOL(self, clutter_actor_get_fixed_position_set(IOCACTOR(self)));
}
static void
st_box_layout_allocate (ClutterActor *actor,
const ClutterActorBox *box,
ClutterAllocationFlags flags)
{
StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (actor)->priv;
StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (actor));
ClutterActorBox content_box;
gfloat avail_width, avail_height, min_width, natural_width, min_height, natural_height;
gfloat position, next_position;
GList *l, *children;
gint n_expand_children = 0, i;
gfloat expand_amount, shrink_amount;
BoxChildShrink *shrinks = NULL;
gboolean flip = (st_widget_get_direction (ST_WIDGET (actor)) == ST_TEXT_DIRECTION_RTL)
&& (!priv->is_vertical);
CLUTTER_ACTOR_CLASS (st_box_layout_parent_class)->allocate (actor, box,
flags);
children = st_container_get_children_list (ST_CONTAINER (actor));
if (children == NULL)
return;
st_theme_node_get_content_box (theme_node, box, &content_box);
avail_width = content_box.x2 - content_box.x1;
avail_height = content_box.y2 - content_box.y1;
get_content_preferred_width (ST_BOX_LAYOUT (actor), avail_height,
&min_width, &natural_width);
get_content_preferred_height (ST_BOX_LAYOUT (actor), MAX (avail_width, min_width),
&min_height, &natural_height);
/* update adjustments for scrolling */
if (priv->vadjustment)
{
gdouble prev_value;
g_object_set (G_OBJECT (priv->vadjustment),
"lower", 0.0,
"upper", MAX (min_height, avail_height),
"page-size", avail_height,
"step-increment", avail_height / 6,
"page-increment", avail_height - avail_height / 6,
NULL);
prev_value = st_adjustment_get_value (priv->vadjustment);
st_adjustment_set_value (priv->vadjustment, prev_value);
}
if (priv->hadjustment)
{
gdouble prev_value;
g_object_set (G_OBJECT (priv->hadjustment),
"lower", 0.0,
"upper", MAX (min_width, avail_width),
"page-size", avail_width,
"step-increment", avail_width / 6,
"page-increment", avail_width - avail_width / 6,
NULL);
prev_value = st_adjustment_get_value (priv->hadjustment);
st_adjustment_set_value (priv->hadjustment, prev_value);
}
if (avail_height < min_height)
{
avail_height = min_height;
content_box.y2 = content_box.y1 + avail_height;
}
if (avail_width < min_width)
{
avail_width = min_width;
content_box.x2 = content_box.x1 + avail_width;
}
if (priv->is_vertical)
{
expand_amount = MAX (0, avail_height - natural_height);
shrink_amount = MAX (0, natural_height - avail_height);
}
else
{
expand_amount = MAX (0, avail_width - natural_width);
shrink_amount = MAX (0, natural_width - avail_width);
}
if (expand_amount > 0)
{
/* count the number of children with expand set to TRUE */
n_expand_children = 0;
for (l = children; l; l = l->next)
{
ClutterActor *child = l->data;
gboolean expand;
if (!CLUTTER_ACTOR_IS_VISIBLE (child) ||
clutter_actor_get_fixed_position_set (child))
continue;
clutter_container_child_get ((ClutterContainer *) actor,
child,
"expand", &expand,
NULL);
if (expand)
n_expand_children++;
}
if (n_expand_children == 0)
expand_amount = 0;
}
else if (shrink_amount > 0)
{
shrinks = compute_shrinks (ST_BOX_LAYOUT (actor),
priv->is_vertical ? avail_width : avail_height,
shrink_amount);
}
if (priv->is_vertical)
position = content_box.y1;
else if (flip)
position = content_box.x2;
else
position = content_box.x1;
if (priv->is_pack_start)
{
l = g_list_last (children);
i = g_list_length (children);
}
else
{
l = children;
i = 0;
}
gboolean firstchild = TRUE;
gfloat init_padding = (avail_width/2) - (natural_width/2);
while (l)
{
ClutterActor *child = (ClutterActor*) l->data;
ClutterActorBox child_box;
gfloat child_min, child_nat, child_allocated;
gboolean xfill, yfill, expand, fixed;
StAlign xalign, yalign;
if (!CLUTTER_ACTOR_IS_VISIBLE (child))
goto next_child;
fixed = clutter_actor_get_fixed_position_set (child);
if (fixed)
{
clutter_actor_allocate_preferred_size (child, flags);
goto next_child;
}
clutter_container_child_get ((ClutterContainer*) actor, child,
"x-fill", &xfill,
"y-fill", &yfill,
"x-align", &xalign,
"y-align", &yalign,
"expand", &expand,
NULL);
if (priv->is_vertical)
{
_st_actor_get_preferred_height (child, avail_width, xfill,
&child_min, &child_nat);
}
else
{
_st_actor_get_preferred_width (child, avail_height, yfill,
&child_min, &child_nat);
}
child_allocated = child_nat;
if (expand_amount > 0 && expand)
child_allocated += expand_amount / n_expand_children;
else if (shrink_amount > 0)
child_allocated -= shrinks[i].shrink_amount;
if (flip) {
next_position = position - child_allocated;
if (xalign == ST_ALIGN_CENTER_SPECIAL && next_position < content_box.x1)
next_position = content_box.x1;
}
else {
next_position = position + child_allocated;
if (xalign == ST_ALIGN_CENTER_SPECIAL && next_position > content_box.x2)
next_position = content_box.x2;
}
if (priv->is_vertical)
{
child_box.y1 = (int)(0.5 + position);
child_box.y2 = (int)(0.5 + next_position);
child_box.x1 = content_box.x1;
child_box.x2 = content_box.x2;
_st_allocate_fill (ST_WIDGET (actor), child, &child_box,
xalign, yalign, xfill, yfill);
clutter_actor_allocate (child, &child_box, flags);
}
else
{
if (flip)
{
if (firstchild && xalign == ST_ALIGN_CENTER_SPECIAL)
{
position -= init_padding;
next_position = position - child_allocated;
firstchild = FALSE;
}
if (xalign == ST_ALIGN_CENTER_SPECIAL && position > content_box.x2) {
position = content_box.x2;
}
child_box.x1 = (int)(0.5 + next_position);
child_box.x2 = (int)(0.5 + position);
}
else
{
if (firstchild && xalign == ST_ALIGN_CENTER_SPECIAL)
{
position += init_padding;
if (position < content_box.x1) {
position = content_box.x1;
}
next_position = position + child_allocated;
firstchild = FALSE;
}
if (xalign == ST_ALIGN_CENTER_SPECIAL && position < content_box.x1) {
position = content_box.x1;
}
child_box.x1 = (int)(0.5 + position);
child_box.x2 = (int)(0.5 + next_position);
}
child_box.y1 = content_box.y1;
child_box.y2 = content_box.y2;
_st_allocate_fill (ST_WIDGET (actor), child, &child_box,
xalign, yalign, xfill, yfill);
clutter_actor_allocate (child, &child_box, flags);
}
if (flip)
position = next_position - priv->spacing;
else
position = next_position + priv->spacing;
next_child:
if (priv->is_pack_start)
{
l = l->prev;
i--;
}
else
{
l = l->next;
i++;
}
}
if (shrinks)
g_free (shrinks);
}
static void
get_content_preferred_height (StBoxLayout *self,
gfloat for_width,
gfloat *min_height_p,
gfloat *natural_height_p)
{
StBoxLayoutPrivate *priv = self->priv;
gint n_children = 0;
gint n_fixed = 0;
gfloat min_height, natural_height;
GList *l, *children;
min_height = 0;
natural_height = 0;
children = st_container_get_children_list (ST_CONTAINER (self));
for (l = children; l; l = g_list_next (l))
{
ClutterActor *child = l->data;
gfloat child_min = 0, child_nat = 0;
gboolean child_fill = FALSE;
if (!CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
n_children++;
if (clutter_actor_get_fixed_position_set (child))
{
n_fixed++;
continue;
}
if (priv->is_vertical)
{
clutter_container_child_get ((ClutterContainer*) self, child,
"x-fill", &child_fill,
NULL);
}
_st_actor_get_preferred_height (child,
(priv->is_vertical) ? for_width : -1,
child_fill,
&child_min,
&child_nat);
if (!priv->is_vertical)
{
min_height = MAX (child_min, min_height);
natural_height = MAX (child_nat, natural_height);
}
else
{
min_height += child_min;
natural_height += child_nat;
}
}
if (priv->is_vertical && (n_children - n_fixed) > 1)
{
min_height += priv->spacing * (n_children - n_fixed - 1);
natural_height += priv->spacing * (n_children - n_fixed - 1);
}
if (min_height_p)
*min_height_p = min_height;
if (natural_height_p)
*natural_height_p = natural_height;
}
static BoxChildShrink *
compute_shrinks (StBoxLayout *self,
gfloat for_length,
gfloat total_shrink)
{
StBoxLayoutPrivate *priv = self->priv;
GList *children = st_container_get_children_list (ST_CONTAINER (self));
int n_children = g_list_length (children);
BoxChildShrink *shrinks = g_new0 (BoxChildShrink, n_children);
gfloat shrink_so_far;
gfloat base_shrink = 0; /* the "= 0" is just to make gcc happy */
int n_shrink_children;
GList *l;
int i;
/* The effect that we want is that all the children get an equal chance
* to expand from their minimum size up to the natural size. Or to put
* it a different way, we want to start by shrinking only the child that
* can shrink most, then shrink that and the next most shrinkable child,
* to the point where we are shrinking everything.
*/
/* Find the amount of possible shrink for each child */
int n_possible_shrink_children = 0;
for (l = children, i = 0; l; l = l->next, i++)
{
ClutterActor *child;
gfloat child_min, child_nat;
gboolean child_fill;
gboolean fixed;
child = (ClutterActor*) l->data;
fixed = clutter_actor_get_fixed_position_set (child);
shrinks[i].child_index = i;
if (CLUTTER_ACTOR_IS_VISIBLE (child) && !fixed)
{
if (priv->is_vertical)
{
clutter_container_child_get ((ClutterContainer*) self, child,
"x-fill", &child_fill,
NULL);
_st_actor_get_preferred_height (child,
for_length, child_fill,
&child_min, &child_nat);
}
else
{
clutter_container_child_get ((ClutterContainer*) self, child,
"y-fill", &child_fill,
NULL);
_st_actor_get_preferred_width (child,
for_length, child_fill,
&child_min, &child_nat);
}
shrinks[i].shrink_amount = MAX (0., child_nat - child_min);
n_possible_shrink_children++;
}
else
{
shrinks[i].shrink_amount = -1.;
}
}
/* We want to process children starting from the child with the maximum available
* shrink, so sort in this order; !visible children end up at the end */
qsort (shrinks, n_children, sizeof (BoxChildShrink), compare_by_shrink_amount);
/* +--+
* | |
* | | +--
* | | | |
* | | | | +-+
* --+--+-+-+-+-+----------
* | | | | | | +-+ +-+
* | | | | | | | | | |
* --+--+-+-+-+-+-+-+------
*
* We are trying to find the correct position for the upper line the "water mark"
* so that total of the portion of the bars above the line is equal to the total
* amount we want to shrink.
*/
/* Start by moving the line downward, top-of-bar by top-of-bar */
shrink_so_far = 0;
for (n_shrink_children = 1; n_shrink_children <= n_possible_shrink_children; n_shrink_children++)
{
if (n_shrink_children < n_possible_shrink_children)
base_shrink = shrinks[n_shrink_children].shrink_amount;
else
base_shrink = 0;
shrink_so_far += n_shrink_children * (shrinks[n_shrink_children - 1].shrink_amount - base_shrink);
if (shrink_so_far >= total_shrink || n_shrink_children == n_possible_shrink_children)
break;
}
/* OK, we found enough shrinkage, move it back upwards to the right position */
base_shrink += (shrink_so_far - total_shrink) / n_shrink_children;
if (base_shrink < 0) /* can't shrink that much, probably round-off error */
base_shrink = 0;
/* Assign the portion above the base shrink line to the shrink_amount */
for (i = 0; i < n_shrink_children; i++)
shrinks[i].shrink_amount -= base_shrink;
for (; i < n_children; i++)
shrinks[i].shrink_amount = 0;
/* And sort back to their original order */
qsort (shrinks, n_children, sizeof (BoxChildShrink), compare_by_child_index);
return shrinks;
}
static void
get_content_preferred_width (StBoxLayout *self,
gfloat for_height,
gfloat *min_width_p,
gfloat *natural_width_p)
{
StBoxLayoutPrivate *priv = self->priv;
gint n_children = 0;
gint n_fixed = 0;
gfloat min_width, natural_width;
ClutterActor *child;
min_width = 0;
natural_width = 0;
for (child = clutter_actor_get_first_child (CLUTTER_ACTOR (self));
child != NULL;
child = clutter_actor_get_next_sibling (child))
{
gfloat child_min = 0, child_nat = 0;
gboolean child_fill;
if (!CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
n_children++;
if (clutter_actor_get_fixed_position_set (child))
{
n_fixed++;
continue;
}
if (priv->is_vertical)
{
_st_actor_get_preferred_width (child, -1, FALSE,
&child_min, &child_nat);
min_width = MAX (child_min, min_width);
natural_width = MAX (child_nat, natural_width);
}
else
{
clutter_container_child_get (CLUTTER_CONTAINER (self), child,
"y-fill", &child_fill,
NULL);
_st_actor_get_preferred_width (child, for_height, child_fill,
&child_min, &child_nat);
min_width += child_min;
natural_width += child_nat;
}
}
if (!priv->is_vertical && (n_children - n_fixed) > 1)
{
min_width += priv->spacing * (n_children - n_fixed - 1);
natural_width += priv->spacing * (n_children - n_fixed - 1);
}
if (min_width_p)
*min_width_p = min_width;
if (natural_width_p)
*natural_width_p = natural_width;
}
