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gnome-shell/src/st/st-box-layout.c
Ray Strode 4e9e6e75d3 st-box-layout: Document insertion apis 
This commit just adds some brief doc comments
to st_box_layout_insert_actor() and
st_box_layout_insert_before()

https://bugzilla.gnome.org/show_bug.cgi?id=657082
2011-08-27 15:25:01 -04:00

1249 lines
36 KiB
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* st-box-layout.h: box layout actor
*
* Copyright 2009 Intel Corporation.
* Copyright 2009 Abderrahim Kitouni
* Copyright 2009, 2010 Red Hat, Inc.
* Copyright 2010 Florian Muellner
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU Lesser General Public License,
* version 2.1, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Portions copied from Clutter:
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*/
/**
* SECTION:st-box-layout
* @short_description: a layout container arranging children in a single line
*
* The #StBoxLayout arranges its children along a single line, where each
* child can be allocated either its preferred size or larger if the expand
* option is set. If the fill option is set, the actor will be allocated more
* than its requested size. If the fill option is not set, but the expand option
* is enabled, then the position of the actor within the available space can
* be determined by the alignment child property.
*
*/
#include <stdlib.h>
#include "st-box-layout.h"
#include "st-private.h"
#include "st-scrollable.h"
#include "st-box-layout-child.h"
static void st_box_container_iface_init (ClutterContainerIface *iface);
static void st_box_scrollable_interface_init (StScrollableInterface *iface);
G_DEFINE_TYPE_WITH_CODE (StBoxLayout, st_box_layout, ST_TYPE_CONTAINER,
G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_CONTAINER,
st_box_container_iface_init)
G_IMPLEMENT_INTERFACE (ST_TYPE_SCROLLABLE,
st_box_scrollable_interface_init));
#define BOX_LAYOUT_PRIVATE(o) \
(G_TYPE_INSTANCE_GET_PRIVATE ((o), ST_TYPE_BOX_LAYOUT, StBoxLayoutPrivate))
enum {
PROP_0,
PROP_VERTICAL,
PROP_PACK_START,
PROP_HADJUST,
PROP_VADJUST
};
struct _StBoxLayoutPrivate
{
guint spacing;
guint is_vertical : 1;
guint is_pack_start : 1;
StAdjustment *hadjustment;
StAdjustment *vadjustment;
};
/*
* ClutterContainer Interface Implementation
*/
static void
st_box_sort_depth_order (ClutterContainer *container)
{
/* The parent class' implementation would mess up the
* left-to-right order of the children - do nothing instead
*/
}
/*
* StScrollable Interface Implementation
*/
static void
adjustment_value_notify_cb (StAdjustment *adjustment,
GParamSpec *pspec,
StBoxLayout *box)
{
clutter_actor_queue_redraw (CLUTTER_ACTOR (box));
}
static void
scrollable_set_adjustments (StScrollable *scrollable,
StAdjustment *hadjustment,
StAdjustment *vadjustment)
{
StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (scrollable)->priv;
g_object_freeze_notify (G_OBJECT (scrollable));
if (hadjustment != priv->hadjustment)
{
if (priv->hadjustment)
{
g_signal_handlers_disconnect_by_func (priv->hadjustment,
adjustment_value_notify_cb,
scrollable);
g_object_unref (priv->hadjustment);
}
if (hadjustment)
{
g_object_ref (hadjustment);
g_signal_connect (hadjustment, "notify::value",
G_CALLBACK (adjustment_value_notify_cb),
scrollable);
}
priv->hadjustment = hadjustment;
g_object_notify (G_OBJECT (scrollable), "hadjustment");
}
if (vadjustment != priv->vadjustment)
{
if (priv->vadjustment)
{
g_signal_handlers_disconnect_by_func (priv->vadjustment,
adjustment_value_notify_cb,
scrollable);
g_object_unref (priv->vadjustment);
}
if (vadjustment)
{
g_object_ref (vadjustment);
g_signal_connect (vadjustment, "notify::value",
G_CALLBACK (adjustment_value_notify_cb),
scrollable);
}
priv->vadjustment = vadjustment;
g_object_notify (G_OBJECT (scrollable), "vadjustment");
}
g_object_thaw_notify (G_OBJECT (scrollable));
}
static void
scrollable_get_adjustments (StScrollable *scrollable,
StAdjustment **hadjustment,
StAdjustment **vadjustment)
{
StBoxLayoutPrivate *priv;
priv = (ST_BOX_LAYOUT (scrollable))->priv;
if (hadjustment)
*hadjustment = priv->hadjustment;
if (vadjustment)
*vadjustment = priv->vadjustment;
}
static void
st_box_scrollable_interface_init (StScrollableInterface *iface)
{
iface->set_adjustments = scrollable_set_adjustments;
iface->get_adjustments = scrollable_get_adjustments;
}
static void
st_box_container_iface_init (ClutterContainerIface *iface)
{
iface->sort_depth_order = st_box_sort_depth_order;
iface->child_meta_type = ST_TYPE_BOX_LAYOUT_CHILD;
}
static void
st_box_layout_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (object)->priv;
StAdjustment *adjustment;
switch (property_id)
{
case PROP_VERTICAL:
g_value_set_boolean (value, priv->is_vertical);
break;
case PROP_PACK_START:
g_value_set_boolean (value, priv->is_pack_start);
break;
case PROP_HADJUST:
scrollable_get_adjustments (ST_SCROLLABLE (object), &adjustment, NULL);
g_value_set_object (value, adjustment);
break;
case PROP_VADJUST:
scrollable_get_adjustments (ST_SCROLLABLE (object), NULL, &adjustment);
g_value_set_object (value, adjustment);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
st_box_layout_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
StBoxLayout *box = ST_BOX_LAYOUT (object);
switch (property_id)
{
case PROP_VERTICAL:
st_box_layout_set_vertical (box, g_value_get_boolean (value));
break;
case PROP_PACK_START:
st_box_layout_set_pack_start (box, g_value_get_boolean (value));
break;
case PROP_HADJUST:
scrollable_set_adjustments (ST_SCROLLABLE (object),
g_value_get_object (value),
box->priv->vadjustment);
break;
case PROP_VADJUST:
scrollable_set_adjustments (ST_SCROLLABLE (object),
box->priv->hadjustment,
g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
st_box_layout_dispose (GObject *object)
{
StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (object)->priv;
if (priv->hadjustment)
{
g_object_unref (priv->hadjustment);
priv->hadjustment = NULL;
}
if (priv->vadjustment)
{
g_object_unref (priv->vadjustment);
priv->vadjustment = NULL;
}
G_OBJECT_CLASS (st_box_layout_parent_class)->dispose (object);
}
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;
GList *l, *children;
min_width = 0;
natural_width = 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;
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;
}
static void
st_box_layout_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));
st_theme_node_adjust_for_height (theme_node, &for_height);
get_content_preferred_width (ST_BOX_LAYOUT (actor), for_height,
min_width_p, natural_width_p);
st_theme_node_adjust_preferred_width (theme_node,
min_width_p, natural_width_p);
}
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_box_layout_get_preferred_height (ClutterActor *actor,
gfloat for_width,
gfloat *min_height_p,
gfloat *natural_height_p)
{
StBoxLayout *self = ST_BOX_LAYOUT (actor);
StBoxLayoutPrivate *priv = self->priv;
StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (actor));
st_theme_node_adjust_for_width (theme_node, &for_width);
if (priv->hadjustment)
{
/* If we're scrolled, the parent calls us with the width that
* we'll actually get, which can be smaller than the minimum
* width that we give our contents.
*/
gfloat min_width;
get_content_preferred_width (self, -1, &min_width, NULL);
for_width = MAX (for_width, min_width);
}
get_content_preferred_height (self, for_width,
min_height_p, natural_height_p);
st_theme_node_adjust_preferred_height (theme_node,
min_height_p, natural_height_p);
}
typedef struct {
int child_index;
gfloat shrink_amount;
} BoxChildShrink;
/* Sort with the greatest shrink amount first */
static int
compare_by_shrink_amount (const void *a,
const void *b)
{
float diff = ((const BoxChildShrink *)a)->shrink_amount - ((const BoxChildShrink *)b)->shrink_amount;
return diff < 0 ? 1 : (diff == 0 ? 0 : -1);
}
/* Sort in ascending order by child index */
static int
compare_by_child_index (const void *a,
const void *b)
{
return ((const BoxChildShrink *)a)->child_index - ((const BoxChildShrink *)b)->child_index;
}
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 = l->data;
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
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;
}
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;
else
next_position = position + child_allocated;
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)
{
child_box.x1 = (int)(0.5 + next_position);
child_box.x2 = (int)(0.5 + position);
}
else
{
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
st_box_layout_apply_transform (ClutterActor *a,
CoglMatrix *m)
{
StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (a)->priv;
gdouble x, y;
CLUTTER_ACTOR_CLASS (st_box_layout_parent_class)->apply_transform (a, m);
if (priv->hadjustment)
x = st_adjustment_get_value (priv->hadjustment);
else
x = 0;
if (priv->vadjustment)
y = st_adjustment_get_value (priv->vadjustment);
else
y = 0;
cogl_matrix_translate (m, (int) -x, (int) -y, 0);
}
/* If we are translated, then we need to translate back before chaining
* up or the background and borders will be drawn in the wrong place */
static void
get_border_paint_offsets (StBoxLayout *self,
double *x,
double *y)
{
StBoxLayoutPrivate *priv = self->priv;
if (priv->hadjustment)
*x = st_adjustment_get_value (priv->hadjustment);
else
*x = 0;
if (priv->vadjustment)
*y = st_adjustment_get_value (priv->vadjustment);
else
*y = 0;
}
static void
st_box_layout_paint (ClutterActor *actor)
{
StBoxLayout *self = ST_BOX_LAYOUT (actor);
StBoxLayoutPrivate *priv = self->priv;
StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (actor));
GList *l, *children;
gdouble x, y;
ClutterActorBox allocation_box;
ClutterActorBox content_box;
get_border_paint_offsets (self, &x, &y);
if (x != 0 || y != 0)
{
cogl_push_matrix ();
cogl_translate ((int)x, (int)y, 0);
}
CLUTTER_ACTOR_CLASS (st_box_layout_parent_class)->paint (actor);
if (x != 0 || y != 0)
{
cogl_pop_matrix ();
}
children = st_container_get_children_list (ST_CONTAINER (actor));
if (children == NULL)
return;
clutter_actor_get_allocation_box (actor, &allocation_box);
st_theme_node_get_content_box (theme_node, &allocation_box, &content_box);
content_box.x1 += x;
content_box.y1 += y;
content_box.x2 += x;
content_box.y2 += y;
/* The content area forms the viewport into the scrolled contents, while
* the borders and background stay in place; after drawing the borders and
* background, we clip to the content area */
if (priv->hadjustment || priv->vadjustment)
cogl_clip_push_rectangle ((int)content_box.x1,
(int)content_box.y1,
(int)content_box.x2,
(int)content_box.y2);
for (l = children; l; l = g_list_next (l))
{
ClutterActor *child = (ClutterActor*) l->data;
if (CLUTTER_ACTOR_IS_VISIBLE (child))
clutter_actor_paint (child);
}
if (priv->hadjustment || priv->vadjustment)
cogl_clip_pop ();
}
static void
st_box_layout_pick (ClutterActor *actor,
const ClutterColor *color)
{
StBoxLayout *self = ST_BOX_LAYOUT (actor);
StBoxLayoutPrivate *priv = self->priv;
StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (actor));
GList *l, *children;
gdouble x, y;
ClutterActorBox allocation_box;
ClutterActorBox content_box;
get_border_paint_offsets (self, &x, &y);
if (x != 0 || y != 0)
{
cogl_push_matrix ();
cogl_translate ((int)x, (int)y, 0);
}
CLUTTER_ACTOR_CLASS (st_box_layout_parent_class)->pick (actor, color);
if (x != 0 || y != 0)
{
cogl_pop_matrix ();
}
children = st_container_get_children_list (ST_CONTAINER (actor));
if (children == NULL)
return;
clutter_actor_get_allocation_box (actor, &allocation_box);
st_theme_node_get_content_box (theme_node, &allocation_box, &content_box);
content_box.x1 += x;
content_box.y1 += y;
content_box.x2 += x;
content_box.y2 += y;
if (priv->hadjustment || priv->vadjustment)
cogl_clip_push_rectangle ((int)content_box.x1,
(int)content_box.y1,
(int)content_box.x2,
(int)content_box.y2);
for (l = children; l; l = g_list_next (l))
{
ClutterActor *child = (ClutterActor*) l->data;
if (CLUTTER_ACTOR_IS_VISIBLE (child))
clutter_actor_paint (child);
}
if (priv->hadjustment || priv->vadjustment)
cogl_clip_pop ();
}
static gboolean
st_box_layout_get_paint_volume (ClutterActor *actor,
ClutterPaintVolume *volume)
{
StBoxLayout *self = ST_BOX_LAYOUT (actor);
gdouble x, y;
if (!CLUTTER_ACTOR_CLASS (st_box_layout_parent_class)->get_paint_volume (actor, volume))
return FALSE;
/* When scrolled, st_box_layout_apply_transform() includes the scroll offset
* and affects paint volumes. This is right for our children, but our paint volume
* is determined by our allocation and borders and doesn't scroll, so we need
* to reverse-compensate here, the same as we do when painting.
*/
get_border_paint_offsets (self, &x, &y);
if (x != 0 || y != 0)
{
ClutterVertex origin;
clutter_paint_volume_get_origin (volume, &origin);
origin.x += x;
origin.y += y;
clutter_paint_volume_set_origin (volume, &origin);
}
return TRUE;
}
static void
st_box_layout_style_changed (StWidget *self)
{
StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (self)->priv;
StThemeNode *theme_node = st_widget_get_theme_node (self);
int old_spacing = priv->spacing;
double spacing;
spacing = st_theme_node_get_length (theme_node, "spacing");
priv->spacing = (int)(spacing + 0.5);
if (priv->spacing != old_spacing)
clutter_actor_queue_relayout (CLUTTER_ACTOR (self));
ST_WIDGET_CLASS (st_box_layout_parent_class)->style_changed (self);
}
static void
st_box_layout_class_init (StBoxLayoutClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
StWidgetClass *widget_class = ST_WIDGET_CLASS (klass);
GParamSpec *pspec;
g_type_class_add_private (klass, sizeof (StBoxLayoutPrivate));
object_class->get_property = st_box_layout_get_property;
object_class->set_property = st_box_layout_set_property;
object_class->dispose = st_box_layout_dispose;
actor_class->allocate = st_box_layout_allocate;
actor_class->get_preferred_width = st_box_layout_get_preferred_width;
actor_class->get_preferred_height = st_box_layout_get_preferred_height;
actor_class->apply_transform = st_box_layout_apply_transform;
actor_class->paint = st_box_layout_paint;
actor_class->get_paint_volume = st_box_layout_get_paint_volume;
actor_class->pick = st_box_layout_pick;
widget_class->style_changed = st_box_layout_style_changed;
pspec = g_param_spec_boolean ("vertical",
"Vertical",
"Whether the layout should be vertical, rather"
"than horizontal",
FALSE,
ST_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_VERTICAL, pspec);
pspec = g_param_spec_boolean ("pack-start",
"Pack Start",
"Whether to pack items at the start of the box",
FALSE,
ST_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_PACK_START, pspec);
/* StScrollable properties */
g_object_class_override_property (object_class,
PROP_HADJUST,
"hadjustment");
g_object_class_override_property (object_class,
PROP_VADJUST,
"vadjustment");
}
static void
st_box_layout_init (StBoxLayout *self)
{
self->priv = BOX_LAYOUT_PRIVATE (self);
}
/**
* st_box_layout_new:
*
* Create a new #StBoxLayout.
*
* Returns: a newly allocated #StBoxLayout
*/
StWidget *
st_box_layout_new (void)
{
return g_object_new (ST_TYPE_BOX_LAYOUT, NULL);
}
/**
* st_box_layout_set_vertical:
* @box: A #StBoxLayout
* @vertical: %TRUE if the layout should be vertical
*
* Set the value of the #StBoxLayout::vertical property
*
*/
void
st_box_layout_set_vertical (StBoxLayout *box,
gboolean vertical)
{
g_return_if_fail (ST_IS_BOX_LAYOUT (box));
if (box->priv->is_vertical != vertical)
{
box->priv->is_vertical = vertical;
clutter_actor_queue_relayout ((ClutterActor*) box);
g_object_notify (G_OBJECT (box), "vertical");
}
}
/**
* st_box_layout_get_vertical:
* @box: A #StBoxLayout
*
* Get the value of the #StBoxLayout::vertical property.
*
* Returns: %TRUE if the layout is vertical
*/
gboolean
st_box_layout_get_vertical (StBoxLayout *box)
{
g_return_val_if_fail (ST_IS_BOX_LAYOUT (box), FALSE);
return box->priv->is_vertical;
}
/**
* st_box_layout_set_pack_start:
* @box: A #StBoxLayout
* @pack_start: %TRUE if the layout should use pack-start
*
* Set the value of the #StBoxLayout::pack-start property.
*
*/
void
st_box_layout_set_pack_start (StBoxLayout *box,
gboolean pack_start)
{
g_return_if_fail (ST_IS_BOX_LAYOUT (box));
if (box->priv->is_pack_start != pack_start)
{
box->priv->is_pack_start = pack_start;
clutter_actor_queue_relayout ((ClutterActor*) box);
g_object_notify (G_OBJECT (box), "pack-start");
}
}
/**
* st_box_layout_get_pack_start:
* @box: A #StBoxLayout
*
* Get the value of the #StBoxLayout::pack-start property.
*
* Returns: %TRUE if pack-start is enabled
*/
gboolean
st_box_layout_get_pack_start (StBoxLayout *box)
{
g_return_val_if_fail (ST_IS_BOX_LAYOUT (box), FALSE);
return box->priv->is_pack_start;
}
/**
* st_box_layout_insert_actor:
* @self: A #StBoxLayout
* @actor: A #ClutterActor
* @pos: position to insert actor
*
* Adds @actor to @self at position @pos. If @pos is
* negative or larger than the number of elements in the
* list then @actor is added after all the others previously
* added.
*/
void
st_box_layout_insert_actor (StBoxLayout *self,
ClutterActor *actor,
int pos)
{
clutter_container_add_actor((ClutterContainer*) self, actor);
st_container_move_child (ST_CONTAINER (self), actor, pos);
}
/**
* st_box_layout_insert_before:
* @self: A #StBoxLayout
* @actor: A #ClutterActor
* @sibling: A previously added #ClutterActor
*
* Adds @actor to @self at the position before @sibling.
* @sibling cannot be %NULL and must be already a child
* of @self.
*/
void
st_box_layout_insert_before (StBoxLayout *self,
ClutterActor *actor,
ClutterActor *sibling)
{
g_return_if_fail (ST_IS_BOX_LAYOUT (self));
clutter_container_add_actor(CLUTTER_CONTAINER (self), actor);
st_container_move_before (ST_CONTAINER (self), actor, sibling);
}
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