static void
st_bin_get_preferred_height (ClutterActor *self,
gfloat for_width,
gfloat *min_height_p,
gfloat *natural_height_p)
{
StBinPrivate *priv = ST_BIN (self)->priv;
StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (self));
st_theme_node_adjust_for_width (theme_node, &for_width);
if (priv->child == NULL)
{
if (min_height_p)
*min_height_p = 0;
if (natural_height_p)
*natural_height_p = 0;
}
else
{
_st_actor_get_preferred_height (priv->child, for_width, priv->x_fill,
min_height_p,
natural_height_p);
}
st_theme_node_adjust_preferred_height (theme_node, min_height_p, natural_height_p);
}
static void
shell_slicer_get_preferred_height (ClutterActor *self,
gfloat for_width,
gfloat *min_height_p,
gfloat *natural_height_p)
{
ClutterActor *child = st_bin_get_child (ST_BIN (self));
StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (self));
st_theme_node_adjust_for_width (theme_node, &for_width);
if (min_height_p)
*min_height_p = 0;
if (child == NULL)
{
if (natural_height_p)
*natural_height_p = 0;
}
else
{
_st_actor_get_preferred_height (child, for_width, FALSE,
NULL,
natural_height_p);
}
st_theme_node_adjust_preferred_height (theme_node, min_height_p, natural_height_p);
}
static void
st_scroll_bar_get_preferred_height (ClutterActor *self,
gfloat for_width,
gfloat *min_height_p,
gfloat *natural_height_p)
{
StScrollBar *bar = ST_SCROLL_BAR (self);
StScrollBarPrivate *priv = bar->priv;
StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (self));
gfloat trough_min_height, trough_natural_height;
gfloat handle_min_height, handle_natural_height;
st_theme_node_adjust_for_width (theme_node, &for_width);
_st_actor_get_preferred_height (priv->trough, for_width, TRUE,
&trough_min_height, &trough_natural_height);
_st_actor_get_preferred_height (priv->handle, for_width, TRUE,
&handle_min_height, &handle_natural_height);
if (priv->vertical)
{
if (min_height_p)
*min_height_p = trough_min_height + handle_min_height;
if (natural_height_p)
*natural_height_p = trough_natural_height + handle_natural_height;
}
else
{
if (min_height_p)
*min_height_p = MAX (trough_min_height, handle_min_height);
if (natural_height_p)
*natural_height_p = MAX (trough_natural_height, handle_natural_height);
}
st_theme_node_adjust_preferred_height (theme_node, min_height_p, natural_height_p);
}
static void
st_table_get_preferred_height (ClutterActor *self,
gfloat for_width,
gfloat *min_height_p,
gfloat *natural_height_p)
{
gint *min_heights, *pref_heights;
gfloat total_min_height, total_pref_height;
StTablePrivate *priv = ST_TABLE (self)->priv;
StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (self));
gint i;
gint *min_widths;
ClutterActor *child;
/* We only support height-for-width allocation. So if we are called
* width-for-height, calculate heights based on our natural width
*/
if (for_width < 0)
{
float natural_width;
clutter_actor_get_preferred_width (self, -1, NULL, &natural_width);
for_width = natural_width;
}
if (priv->n_rows < 1)
{
*min_height_p = 0;
*natural_height_p = 0;
return;
}
st_theme_node_adjust_for_width (theme_node, &for_width);
/* Setting size to zero and then what we want it to be causes a clear if
* clear flag is set (which it should be.)
*/
g_array_set_size (priv->min_heights, 0);
g_array_set_size (priv->pref_heights, 0);
g_array_set_size (priv->min_heights, priv->n_rows);
g_array_set_size (priv->pref_heights, priv->n_rows);
/* use min_widths to help allocation of height-for-width widgets */
min_widths = st_table_calculate_col_widths (ST_TABLE (self), for_width);
min_heights = (gint *) priv->min_heights->data;
pref_heights = (gint *) priv->pref_heights->data;
/* calculate minimum row heights */
for (child = clutter_actor_get_first_child (self);
child != NULL;
child = clutter_actor_get_next_sibling (child))
{
gint row, col, col_span, cell_width, row_span;
gfloat min, pref;
StTableChild *meta;
meta = (StTableChild *) clutter_container_get_child_meta (CLUTTER_CONTAINER (self), child);
if (!meta->allocate_hidden && !CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
/* get child properties */
row = meta->row;
col = meta->col;
col_span = meta->col_span;
row_span = meta->row_span;
cell_width = 0;
for (i = 0; i < col_span && col + i < priv->n_cols; i++)
cell_width += min_widths[col + i];
_st_actor_get_preferred_height (child, (float) cell_width, meta->x_fill,
&min, &pref);
if (row_span == 1 && min > min_heights[row])
min_heights[row] = min;
if (row_span == 1 && pref > pref_heights[row])
pref_heights[row] = pref;
}
/* start off with row spacing */
total_min_height = (priv->n_rows - 1) * (float) (priv->row_spacing);
total_pref_height = total_min_height;
for (i = 0; i < priv->n_rows; i++)
{
total_min_height += min_heights[i];
total_pref_height += pref_heights[i];
}
if (min_height_p)
*min_height_p = total_min_height;
if (natural_height_p)
*natural_height_p = total_pref_height;
st_theme_node_adjust_preferred_height (theme_node, min_height_p, natural_height_p);
}
static gint *
st_table_calculate_row_heights (StTable *table,
gint for_height,
gint * col_widths)
{
StTablePrivate *priv = ST_TABLE (table)->priv;
gint *is_expand_row, *min_heights, *pref_heights, *row_heights, extra_row_height;
gint i, total_min_height;
gint expanded_rows = 0;
gint n_expanded_rows = 0;
ClutterActor *child;
g_array_set_size (priv->row_heights, 0);
g_array_set_size (priv->row_heights, priv->n_rows);
row_heights = (gboolean *) priv->row_heights->data;
g_array_set_size (priv->is_expand_row, 0);
g_array_set_size (priv->is_expand_row, priv->n_rows);
is_expand_row = (gboolean *) priv->is_expand_row->data;
g_array_set_size (priv->min_heights, 0);
g_array_set_size (priv->min_heights, priv->n_rows);
min_heights = (gboolean *) priv->min_heights->data;
g_array_set_size (priv->pref_heights, 0);
g_array_set_size (priv->pref_heights, priv->n_rows);
pref_heights = (gboolean *) priv->pref_heights->data;
for (child = clutter_actor_get_first_child (CLUTTER_ACTOR (table));
child != NULL;
child = clutter_actor_get_next_sibling (child))
{
gint row, col, cell_width;
gfloat h_min, h_pref;
gboolean y_expand;
StTableChild *meta;
gint col_span, row_span;
meta = (StTableChild *) clutter_container_get_child_meta (CLUTTER_CONTAINER (table), child);
if (!meta->allocate_hidden && !CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
/* get child properties */
col = meta->col;
row = meta->row;
y_expand = meta->y_expand;
col_span = meta->col_span;
row_span = meta->row_span;
if (y_expand)
is_expand_row[row] = TRUE;
/* calculate the cell width by including any spanned columns */
cell_width = 0;
for (i = 0; i < col_span && col + i < priv->n_cols; i++)
cell_width += (float)(col_widths[col + i]);
if (!meta->x_fill)
{
gfloat width;
_st_actor_get_preferred_width (child, -1, meta->y_fill, NULL, &width);
cell_width = MIN (cell_width, width);
}
_st_actor_get_preferred_height (child, cell_width, meta->x_fill,
&h_min, &h_pref);
if (row_span == 1 && h_pref > pref_heights[row])
{
pref_heights[row] = (int)(h_pref);
}
if (row_span == 1 && h_min > min_heights[row])
{
min_heights[row] = (int)(h_min);
}
}
total_min_height = 0; // priv->row_spacing * (priv->n_rows - 1);
for (i = 0; i < priv->n_rows; i++)
total_min_height += pref_heights[i];
/* calculate the remaining space and distribute it evenly onto all rows/cols
* with the x/y expand property set. */
for (i = 0; i < priv->n_rows; i++)
if (is_expand_row[i])
{
expanded_rows += pref_heights[i];
n_expanded_rows++;
}
/* extra row height = for height - row spacings - total_min_height */
for_height -= (priv->row_spacing * (priv->n_rows - 1));
extra_row_height = for_height - total_min_height;
if (extra_row_height < 0)
{
gint *skip = g_slice_alloc0 (sizeof (gint) * priv->n_rows);
gint total_shrink_height;
/* If we need to shrink rows, we need to do multiple passes.
*
* We start by assuming all rows can shrink. All rows are sized
* proportional to their height in the total table size. If a row would be
* sized smaller than its minimum size, we mark it as non-shrinkable, and
* reduce extra_row_height by the amount it has been shrunk. The amount
* it has been shrunk by is the difference between the preferred and
* minimum height, since all rows start at their preferred height. We
* also then reduce the total table size (stored in total_shrink_height) by the height
* of the row we are going to be skipping.
*
*/
/* We start by assuming all rows can shrink */
total_shrink_height = total_min_height;
for (i = 0; i < priv->n_rows; i++)
{
if (!skip[i])
{
gint tmp;
/* Calculate the height of the row by starting with the preferred
* height and taking away the extra row height proportional to
* the preferred row height over the rows that are being shrunk
*/
tmp = pref_heights[i]
+ (extra_row_height * (pref_heights[i] / (float) total_shrink_height));
if (tmp < min_heights[i])
{
/* This was a row we *were* set to shrink, but we now find it would have
* been shrunk too much. We remove it from the list of rows to shrink and
* adjust extra_row_height and total_shrink_height appropriately */
skip[i] = TRUE;
row_heights[i] = min_heights[i];
/* Reduce extra_row_height by the amount we have reduced this
* actor by */
extra_row_height += (pref_heights[i] - min_heights[i]);
/* now take off the row from the total shrink height */
total_shrink_height -= pref_heights[i];
/* restart the loop */
i = -1;
}
else
{
skip[i] = FALSE;
row_heights[i] = tmp;
}
}
}
g_slice_free1 (sizeof (gint) * priv->n_rows, skip);
}
else
{
for (i = 0; i < priv->n_rows; i++)
{
if (is_expand_row[i])
row_heights[i] = pref_heights[i] + (extra_row_height / n_expanded_rows);
else
row_heights[i] = pref_heights[i];
}
}
return row_heights;
}
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 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_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 void
st_table_calculate_row_heights (StTable *table,
gint for_height)
{
StTablePrivate *priv = ST_TABLE (table)->priv;
GList *list, *children;
gint i;
DimensionData *rows, *columns;
g_array_set_size (priv->rows, 0);
g_array_set_size (priv->rows, priv->n_rows);
rows = &g_array_index (priv->rows, DimensionData, 0);
columns = &g_array_index (priv->columns, DimensionData, 0);
/* Reset the visible rows */
priv->visible_rows = 0;
for (i = 0; i < priv->n_rows; i++)
rows[i].is_visible = FALSE;
/* STAGE ONE: calculate row heights for non-spanned children */
children = st_container_get_children_list (ST_CONTAINER (table));
for (list = children; list; list = list->next)
{
StTableChild *meta;
ClutterActor *child;
DimensionData *row;
gfloat c_min, c_pref;
child = CLUTTER_ACTOR (list->data);
meta = (StTableChild *)
clutter_container_get_child_meta (CLUTTER_CONTAINER (table), child);
if (!meta->allocate_hidden && !CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
if (meta->row_span > 1)
continue;
row = &rows[meta->row];
/* If this child is visible, then its row is visible */
if (!row->is_visible)
{
row->is_visible = TRUE;
priv->visible_rows++;
}
_st_actor_get_preferred_height (child, columns[meta->col].final_size,
meta->x_fill, &c_min, &c_pref);
row->min_size = MAX (row->min_size, c_min);
row->final_size = row->pref_size = MAX (row->pref_size, c_pref);
row->expand = MAX (row->expand, meta->y_expand);
}
/* STAGE TWO: take spanning children into account */
for (list = children; list; list = list->next)
{
StTableChild *meta;
ClutterActor *child;
gfloat c_min, c_pref;
gfloat min_height, pref_height;
gint start_row, end_row;
gint n_expand;
child = CLUTTER_ACTOR (list->data);
meta = (StTableChild *)
clutter_container_get_child_meta (CLUTTER_CONTAINER (table), child);
if (!meta->allocate_hidden && !CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
if (meta->row_span < 2)
continue;
start_row = meta->row;
end_row = meta->row + meta->row_span - 1;
_st_actor_get_preferred_height (child, columns[meta->col].final_size,
meta->x_fill, &c_min, &c_pref);
/* check there is enough room for this actor */
min_height = 0;
pref_height = 0;
n_expand = 0;
for (i = start_row; i <= end_row; i++)
{
min_height += rows[i].min_size;
pref_height += rows[i].pref_size;
if (rows[i].expand)
{
n_expand++;
}
/* If this actor is visible, then all the rows is spans are visible */
if (!rows[i].is_visible)
{
rows[i].is_visible = TRUE;
priv->visible_rows++;
}
rows[i].expand = MAX (rows[i].expand, meta->y_expand);
}
min_height += priv->row_spacing * (meta->row_span - 1);
pref_height += priv->row_spacing * (meta->row_span - 1);
/* 1) If the minimum height of the rows spanned is less than the minimum
* height of the child that is spanning them, then we must increase the
* minimum height of the rows spanned.
*
* 2) If the preferred height of the spanned rows is more that the minimum
* height of the spanning child, then we can start at this size and
* decrease each row evenly.
*
* 3) If the preferred height of the rows is more than the minimum height
* of the spanned child, then we can start at the preferred height and
* expand.
*/
/* (1) */
if (c_min > min_height)
{
/* (2) */
/* we can start from preferred height and decrease */
if (pref_height > c_min)
{
for (i = start_row; i <= end_row; i++)
{
rows[i].final_size = rows[i].pref_size;
}
while (pref_height > c_min)
{
for (i = start_row; i <= end_row; i++)
{
if (rows[i].final_size > rows[i].min_size)
{
rows[i].final_size--;
pref_height--;
}
}
}
for (i = start_row; i <= end_row; i++)
{
rows[i].min_size = rows[i].final_size;
}
}
else
{
/* (3) */
/* we can expand from preferred size */
gfloat expand_by;
expand_by = c_pref - pref_height;
for (i = start_row; i <= end_row; i++)
{
if (n_expand)
{
if (rows[i].expand)
rows[i].min_size =
rows[i].pref_size + expand_by / n_expand;
}
else
{
rows[i].min_size =
rows[i].pref_size + expand_by / meta->row_span;
}
}
}
}
}
/* calculate final heights */
if (for_height >= 0)
{
gfloat min_height, pref_height;
gint n_expand;
min_height = 0;
pref_height = 0;
n_expand = 0;
for (i = 0; i < priv->n_rows; i++)
{
pref_height += rows[i].pref_size;
min_height += rows[i].min_size;
if (rows[i].expand)
n_expand++;
}
pref_height += priv->row_spacing * (priv->n_rows - 1);
min_height += priv->row_spacing * (priv->n_rows - 1);
if (for_height <= min_height)
{
/* erk, we can't shrink this! */
for (i = 0; i < priv->n_rows; i++)
{
rows[i].final_size = rows[i].min_size;
}
return;
}
if (for_height == pref_height)
{
/* perfect! */
for (i = 0; i < priv->n_rows; i++)
{
rows[i].final_size = rows[i].pref_size;
}
return;
}
/* for_height is between min_height and pref_height */
if (for_height < pref_height && for_height > min_height)
{
gfloat height;
/* shrink rows until they reach min_height */
/* start with all rows at preferred size */
for (i = 0; i < priv->n_rows; i++)
{
rows[i].final_size = rows[i].pref_size;
}
height = pref_height;
while (height > for_height)
{
for (i = 0; i < priv->n_rows; i++)
{
if (rows[i].final_size > rows[i].min_size)
{
rows[i].final_size--;
height--;
}
}
}
return;
}
/* expand rows */
if (for_height > pref_height)
{
gfloat extra_height = for_height - pref_height;
gint remaining;
if (n_expand)
remaining = (gint) extra_height % n_expand;
else
remaining = (gint) extra_height % priv->n_rows;
for (i = 0; i < priv->n_rows; i++)
{
if (rows[i].expand)
rows[i].final_size =
rows[i].pref_size + (extra_height / n_expand);
else if (!n_expand)
rows[i].final_size =
rows[i].pref_size + (extra_height / priv->n_rows);
else
rows[i].final_size = rows[i].pref_size;
}
/* distribute the remainder among children */
i = 0;
while (remaining)
{
if (rows[i].expand || !n_expand)
{
rows[i].final_size++;
remaining--;
}
i++;
}
}
}
}
