305 lines
9.1 KiB
C
305 lines
9.1 KiB
C
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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#include "shell-overflow-list.h"
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G_DEFINE_TYPE (ShellOverflowList,
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shell_overflow_list,
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CLUTTER_TYPE_GROUP);
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enum {
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PROP_0,
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PROP_SPACING,
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PROP_ITEM_HEIGHT,
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PROP_PAGE,
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PROP_N_PAGES
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};
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struct _ShellOverflowListPrivate {
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guint item_height;
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guint spacing;
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guint page;
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guint n_pages;
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guint items_per_page;
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};
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static void
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shell_overflow_list_set_property(GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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ShellOverflowList *self = SHELL_OVERFLOW_LIST (object);
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ShellOverflowListPrivate *priv = self->priv;
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switch (prop_id)
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{
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case PROP_SPACING:
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priv->spacing = g_value_get_float (value);
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clutter_actor_queue_relayout (CLUTTER_ACTOR (self));
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break;
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case PROP_ITEM_HEIGHT:
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priv->item_height = g_value_get_float (value);
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clutter_actor_queue_relayout (CLUTTER_ACTOR (self));
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break;
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case PROP_PAGE:
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priv->page = g_value_get_uint (value);
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clutter_actor_queue_redraw (CLUTTER_ACTOR (self));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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shell_overflow_list_get_property(GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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ShellOverflowList *self = SHELL_OVERFLOW_LIST (object);
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ShellOverflowListPrivate *priv = self->priv;
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switch (prop_id)
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{
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case PROP_SPACING:
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g_value_set_float (value, priv->spacing);
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break;
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case PROP_ITEM_HEIGHT:
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g_value_set_float (value, priv->spacing);
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break;
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case PROP_PAGE:
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g_value_set_uint (value, priv->page);
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break;
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case PROP_N_PAGES:
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g_value_set_uint (value, priv->n_pages);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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shell_overflow_list_allocate (ClutterActor *actor,
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const ClutterActorBox *box,
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ClutterAllocationFlags flags)
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{
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ShellOverflowList *self = SHELL_OVERFLOW_LIST (actor);
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ShellOverflowListPrivate *priv = self->priv;
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GList *children, *iter;
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int n_pages;
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int n_children;
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int n_fits;
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float width;
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float curheight;
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float avail_height;
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gboolean overflow;
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/* chain up to set actor->allocation */
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(CLUTTER_ACTOR_CLASS (g_type_class_peek (clutter_actor_get_type ())))->allocate (actor, box, flags);
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width = box->x2 - box->x1;
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curheight = 0;
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avail_height = box->y2 - box->y1;
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children = clutter_container_get_children (CLUTTER_CONTAINER (self));
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n_children = g_list_length (children);
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n_fits = 0;
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n_pages = 1;
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overflow = FALSE;
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for (iter = children; iter; iter = iter->next)
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{
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ClutterActor *actor = CLUTTER_ACTOR (iter->data);
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ClutterActorBox child_box;
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if ((curheight + priv->item_height) > avail_height)
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{
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overflow = TRUE;
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curheight = 0;
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n_pages++;
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}
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else if (!overflow)
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n_fits++;
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child_box.x1 = 0;
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child_box.x2 = width;
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child_box.y1 = curheight;
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child_box.y2 = child_box.y1 + priv->item_height;
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clutter_actor_allocate (actor, &child_box, flags);
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curheight += priv->item_height;
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if (iter != children)
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curheight += priv->spacing;
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}
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priv->items_per_page = n_fits;
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if (n_pages != priv->n_pages)
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{
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priv->n_pages = n_pages;
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g_object_notify (G_OBJECT (self), "n-pages");
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}
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g_list_free (children);
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}
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void
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shell_overflow_list_paint (ClutterActor *actor)
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{
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ShellOverflowList *self = SHELL_OVERFLOW_LIST (actor);
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ShellOverflowListPrivate *priv = self->priv;
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GList *children, *iter;
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int i;
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children = clutter_container_get_children (CLUTTER_CONTAINER (self));
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if (children == NULL)
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return;
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iter = g_list_nth (children, (priv->page) * priv->items_per_page);
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i = 0;
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for (;iter && i < priv->items_per_page; iter = iter->next, i++)
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{
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ClutterActor *actor = CLUTTER_ACTOR (iter->data);
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clutter_actor_paint (actor);
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}
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g_list_free (children);
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}
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static void
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shell_overflow_list_get_preferred_height (ClutterActor *actor,
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gfloat for_width,
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gfloat *min_height_p,
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gfloat *natural_height_p)
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{
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ShellOverflowList *self = SHELL_OVERFLOW_LIST (actor);
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ShellOverflowListPrivate *priv = self->priv;
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GList *children;
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if (min_height_p)
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*min_height_p = 0;
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if (natural_height_p)
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{
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int n_children;
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children = clutter_container_get_children (CLUTTER_CONTAINER (self));
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n_children = g_list_length (children);
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if (n_children == 0)
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*natural_height_p = 0;
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else
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*natural_height_p = (n_children - 1) * (priv->item_height + priv->spacing) + priv->item_height;
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g_list_free (children);
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}
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}
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static void
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shell_overflow_list_get_preferred_width (ClutterActor *actor,
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gfloat for_height,
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gfloat *min_width_p,
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gfloat *natural_width_p)
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{
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ShellOverflowList *self = SHELL_OVERFLOW_LIST (actor);
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gboolean first = TRUE;
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float min = 0, natural = 0;
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GList *iter;
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GList *children;
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children = clutter_container_get_children (CLUTTER_CONTAINER (self));
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for (iter = children; iter; iter = iter->next)
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{
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ClutterActor *child = iter->data;
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float child_min, child_natural;
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clutter_actor_get_preferred_width (child,
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for_height,
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&child_min,
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&child_natural);
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if (first)
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{
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first = FALSE;
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min = child_min;
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natural = child_natural;
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}
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else
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{
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if (child_min > min)
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min = child_min;
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if (child_natural > natural)
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natural = child_natural;
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}
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}
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if (min_width_p)
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*min_width_p = min;
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if (natural_width_p)
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*natural_width_p = natural;
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g_list_free (children);
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}
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static void
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shell_overflow_list_class_init (ShellOverflowListClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
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gobject_class->get_property = shell_overflow_list_get_property;
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gobject_class->set_property = shell_overflow_list_set_property;
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actor_class->get_preferred_width = shell_overflow_list_get_preferred_width;
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actor_class->get_preferred_height = shell_overflow_list_get_preferred_height;
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actor_class->allocate = shell_overflow_list_allocate;
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actor_class->paint = shell_overflow_list_paint;
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g_object_class_install_property (gobject_class,
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PROP_SPACING,
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g_param_spec_float ("spacing",
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"Spacing",
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"Space between items",
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0.0, G_MAXFLOAT, 0.0,
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G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_ITEM_HEIGHT,
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g_param_spec_float ("item-height",
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"Item height",
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"Fixed item height value",
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0.0, G_MAXFLOAT, 0.0,
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G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_PAGE,
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g_param_spec_uint ("page",
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"Page number",
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"Page number",
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0, G_MAXUINT, 0,
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G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_N_PAGES,
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g_param_spec_uint ("n-pages",
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"Number of pages",
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"Number of pagest",
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0, G_MAXUINT, 0,
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G_PARAM_READABLE));
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g_type_class_add_private (gobject_class, sizeof (ShellOverflowListPrivate));
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}
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static void
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shell_overflow_list_init (ShellOverflowList *self)
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{
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self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
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SHELL_TYPE_OVERFLOW_LIST,
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ShellOverflowListPrivate);
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self->priv->n_pages = 1;
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self->priv->page = 0;
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}
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