+++ /dev/null
-/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
-/*
- * st-overflow-box.c: A vertical box which paints as many actors as it can fit
- *
- * Copyright 2009, 2010 Red Hat, Inc.
- * Copyright 2009 Intel Corporation.
- *
- * 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/>.
- */
-
-/**
- * SECTION:st-overflow-box
- * @short_description: A vertical box which paints as many actors as it can fit
- *
- * This is a "flexible" box which will paint as many actors as it can within
- * its given allocation; its minimum height request will be the sum of the
- * mimimum size for the #StOverflowBox:min-children property, which is
- * by default 0.
- *
- * Every child will be allocated the full width of the box, and always be
- * given its preferred height. Even if not actually painted, every child
- * is counted for overall preferred width/height.
- */
-
-#include <stdlib.h>
-
-#include "st-overflow-box.h"
-
-#include "st-private.h"
-#include "st-box-layout-child.h"
-
-G_DEFINE_TYPE (StOverflowBox, st_overflow_box, ST_TYPE_CONTAINER)
-
-#define OVERFLOW_BOX_LAYOUT_PRIVATE(o) \
- (G_TYPE_INSTANCE_GET_PRIVATE ((o), ST_TYPE_OVERFLOW_BOX, StOverflowBoxPrivate))
-
-enum {
- PROP_0,
-
- PROP_MIN_CHILDREN
-};
-
-struct _StOverflowBoxPrivate
-{
- guint min_children;
- guint n_visible;
-
- guint spacing;
-};
-
-
-static void
-st_overflow_box_get_property (GObject *object,
- guint property_id,
- GValue *value,
- GParamSpec *pspec)
-{
- StOverflowBoxPrivate *priv = ST_OVERFLOW_BOX (object)->priv;
-
- switch (property_id)
- {
- case PROP_MIN_CHILDREN:
- g_value_set_uint (value, priv->min_children);
- break;
-
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
- }
-}
-
-static void
-st_overflow_box_set_property (GObject *object,
- guint property_id,
- const GValue *value,
- GParamSpec *pspec)
-{
- StOverflowBox *box = ST_OVERFLOW_BOX (object);
-
- switch (property_id)
- {
- case PROP_MIN_CHILDREN:
- st_overflow_box_set_min_children (box, g_value_get_uint (value));
- break;
-
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
- }
-}
-
-static void
-get_content_preferred_width (StOverflowBox *self,
- gfloat for_height,
- gfloat *min_width_p,
- gfloat *natural_width_p)
-{
- StOverflowBoxPrivate *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;
-
- if (!CLUTTER_ACTOR_IS_VISIBLE (child))
- continue;
-
- n_children++;
-
- if (clutter_actor_get_fixed_position_set (child))
- {
- n_fixed++;
- continue;
- }
-
- clutter_actor_get_preferred_width (child,
- -1,
- &child_min,
- &child_nat);
-
- min_width = MAX (child_min, min_width);
- natural_width = MAX (child_nat, natural_width);
- }
-
- if ((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_overflow_box_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_OVERFLOW_BOX (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 (StOverflowBox *self,
- gfloat for_width,
- gfloat *min_height_p,
- gfloat *natural_height_p)
-{
- StOverflowBoxPrivate *priv = self->priv;
- gint n_min_children = 0;
- 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;
-
- if (!CLUTTER_ACTOR_IS_VISIBLE (child))
- continue;
-
- n_children++;
-
- if (clutter_actor_get_fixed_position_set (child))
- {
- n_fixed++;
- continue;
- }
-
- clutter_actor_get_preferred_height (child,
- for_width,
- &child_min,
- &child_nat);
-
- if (n_children < priv->min_children)
- {
- n_min_children++;
- min_height += child_min;
- }
- natural_height += child_nat;
- }
-
- min_height += priv->spacing * MAX(0, n_min_children - 1);
- natural_height += priv->spacing * MAX(0, 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_overflow_box_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));
-
- st_theme_node_adjust_for_width (theme_node, &for_width);
-
- get_content_preferred_height (ST_OVERFLOW_BOX (actor), for_width,
- min_height_p, natural_height_p);
-
- st_theme_node_adjust_preferred_height (theme_node,
- min_height_p, natural_height_p);
-}
-
-static void
-st_overflow_box_allocate (ClutterActor *actor,
- const ClutterActorBox *box,
- ClutterAllocationFlags flags)
-{
- StOverflowBoxPrivate *priv = ST_OVERFLOW_BOX (actor)->priv;
- StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (actor));
- ClutterActorBox content_box;
- gfloat position;
- float avail_width;
- GList *l, *children;
- int i;
- gboolean done_non_fixed;
-
- CLUTTER_ACTOR_CLASS (st_overflow_box_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;
-
- position = content_box.y1;
- priv->n_visible = 0;
-
- done_non_fixed = FALSE;
- for (l = children, i = 0; l; l = l->next, i++)
- {
- ClutterActor *child = (ClutterActor*) l->data;
- ClutterActorBox child_box;
- gfloat child_min, child_nat;
- gboolean fixed;
-
- if (!CLUTTER_ACTOR_IS_VISIBLE (child))
- continue;
-
- fixed = clutter_actor_get_fixed_position_set (child);
- if (fixed)
- {
- clutter_actor_allocate_preferred_size (child, flags);
- continue;
- }
- else if (done_non_fixed)
- continue;
-
- clutter_actor_get_preferred_height (child, avail_width,
- &child_min, &child_nat);
-
- if (position + child_nat > content_box.y2)
- {
- done_non_fixed = TRUE; /* Continue iterating on non fixed */
- continue;
- }
-
- priv->n_visible++;
- child_box.y1 = (int)(0.5 + position);
- child_box.y2 = child_box.y1 + (int)(0.5 + child_nat);
- child_box.x1 = content_box.x1;
- child_box.x2 = content_box.x2;
-
- position += child_nat + priv->spacing;
-
- clutter_actor_allocate (child, &child_box, flags);
- }
-}
-
-static void
-visible_children_iter_init (StOverflowBox *box,
- GList **iter,
- int *n)
-{
- *iter = st_container_get_children_list (ST_CONTAINER (box));
- *n = 0;
-}
-
-static ClutterActor *
-visible_children_iter (StOverflowBox *box,
- GList **iter,
- int *n)
-{
- StOverflowBoxPrivate *priv = box->priv;
- GList *l;
-
- for (l = *iter; *n < priv->n_visible && l; l = l->next)
- {
- ClutterActor *child = (ClutterActor*) l->data;
-
- if (!CLUTTER_ACTOR_IS_VISIBLE (child))
- continue;
- if (!clutter_actor_get_fixed_position_set (child))
- (*n)++;
-
- *iter = l->next;
- return child;
- }
-
- for (; l; l = l->next)
- {
- ClutterActor *child = (ClutterActor*) l->data;
-
- if (!CLUTTER_ACTOR_IS_VISIBLE (child))
- continue;
-
- if (clutter_actor_get_fixed_position_set (child))
- {
- *iter = l->next;
- return child;
- }
- }
-
- return NULL;
-}
-
-static void
-st_overflow_box_internal_paint (StOverflowBox *box)
-{
- ClutterActor *child;
- GList *children;
- int n;
-
- visible_children_iter_init (box, &children, &n);
- while ((child = visible_children_iter (box, &children, &n)))
- clutter_actor_paint (child);
-}
-
-static void
-st_overflow_box_paint (ClutterActor *actor)
-{
- CLUTTER_ACTOR_CLASS (st_overflow_box_parent_class)->paint (actor);
-
- st_overflow_box_internal_paint (ST_OVERFLOW_BOX (actor));
-}
-
-static void
-st_overflow_box_pick (ClutterActor *actor,
- const ClutterColor *color)
-{
- CLUTTER_ACTOR_CLASS (st_overflow_box_parent_class)->pick (actor, color);
-
- st_overflow_box_internal_paint (ST_OVERFLOW_BOX (actor));
-}
-
-static void
-st_overflow_box_style_changed (StWidget *self)
-{
- StOverflowBoxPrivate *priv = ST_OVERFLOW_BOX (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_overflow_box_parent_class)->style_changed (self);
-}
-
-static GList *
-st_overflow_box_get_focus_chain (StContainer *container)
-{
- StOverflowBox *box = ST_OVERFLOW_BOX (container);
- ClutterActor *child;
- GList *children, *focus_chain;
- int n;
-
- focus_chain = NULL;
- visible_children_iter_init (box, &children, &n);
- while ((child = visible_children_iter (box, &children, &n)))
- focus_chain = g_list_prepend (focus_chain, child);
-
- return g_list_reverse (focus_chain);
-}
-
-static void
-st_overflow_box_class_init (StOverflowBoxClass *klass)
-{
- GObjectClass *object_class = G_OBJECT_CLASS (klass);
- ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
- StWidgetClass *widget_class = ST_WIDGET_CLASS (klass);
- StContainerClass *container_class = ST_CONTAINER_CLASS (klass);
- GParamSpec *pspec;
-
- g_type_class_add_private (klass, sizeof (StOverflowBoxPrivate));
-
- object_class->get_property = st_overflow_box_get_property;
- object_class->set_property = st_overflow_box_set_property;
-
- actor_class->allocate = st_overflow_box_allocate;
- actor_class->get_preferred_width = st_overflow_box_get_preferred_width;
- actor_class->get_preferred_height = st_overflow_box_get_preferred_height;
- actor_class->paint = st_overflow_box_paint;
- actor_class->pick = st_overflow_box_pick;
-
- widget_class->style_changed = st_overflow_box_style_changed;
-
- container_class->get_focus_chain = st_overflow_box_get_focus_chain;
-
- pspec = g_param_spec_uint ("min-children",
- "Min Children",
- "The actor will request a minimum size large enough to include this many children",
- 0, G_MAXUINT, 0,
- ST_PARAM_READWRITE);
- g_object_class_install_property (object_class, PROP_MIN_CHILDREN, pspec);
-}
-
-static void
-st_overflow_box_init (StOverflowBox *self)
-{
- self->priv = OVERFLOW_BOX_LAYOUT_PRIVATE (self);
-}
-
-/**
- * st_overflow_box_get_min_children:
- * @box: A #StOverflowBox
- *
- * Get the value of the #StOverflowBox::pack-start property.
- *
- * Returns: %TRUE if pack-start is enabled
- */
-gboolean
-st_overflow_box_get_min_children (StOverflowBox *box)
-{
- g_return_val_if_fail (ST_IS_OVERFLOW_BOX (box), FALSE);
-
- return box->priv->min_children;
-}
-
-/**
- * st_box_layout_set_min_children:
- * @box: A #StOverflowBox
- * @min_children: Minimum children value
- *
- * Set the minimum number of children to be visible.
- */
-void
-st_overflow_box_set_min_children (StOverflowBox *box,
- guint min_children)
-{
- g_return_if_fail (ST_IS_OVERFLOW_BOX (box));
-
- if (box->priv->min_children != min_children)
- {
- box->priv->min_children = min_children;
- clutter_actor_queue_relayout ((ClutterActor*) box);
-
- g_object_notify (G_OBJECT (box), "min-children");
- }
-}
-
-/**
- * st_overflow_box_get_n_children:
- * @box: a #StOverflowBox
- *
- * Returns the number of children in this box.
- */
-guint
-st_overflow_box_get_n_children (StOverflowBox *self)
-{
- GList *children = st_container_get_children_list (ST_CONTAINER (self));
- return g_list_length (children);
-}
-
-/**
- * st_overflow_box_get_n_visible:
- * @box: a #StOverflowBox
- *
- * Returns the number of children we will paint. Only valid
- * after the actor has been allocated.
- */
-guint
-st_overflow_box_get_n_visible (StOverflowBox *self)
-{
- return self->priv->n_visible;
-}
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