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mutter/clutter/clutter-flow-layout.c
Bastian Winkler 55ec9f57db flow-layout: Add :snap-to-grid property 
Add a :snap-to-grid property to FlowLayout to prevent the layout from
assigning it's children a position based on the size of the largest
child.

https://bugzilla.gnome.org/show_bug.cgi?id=648873
2013-05-11 11:04:40 -04:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Copyright (C) 2009 Intel Corporation.
*
* 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.
*
* This library is distributed in the hope that 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 library. If not, see <http://www.gnu.org/licenses/>.
*
* Author:
* Emmanuele Bassi <ebassi@linux.intel.com>
*/
/**
* SECTION:clutter-flow-layout
* @short_description: A reflowing layout manager
*
* #ClutterFlowLayout is a layout manager which implements the following
* policy:
*
* <itemizedlist>
* <listitem><para>the preferred natural size depends on the value
* of the #ClutterFlowLayout:orientation property; the layout will try
* to maintain all its children on a single row or
* column;</para></listitem>
* <listitem><para>if either the width or the height allocated are
* smaller than the preferred ones, the layout will wrap; in this case,
* the preferred height or width, respectively, will take into account
* the amount of columns and rows;</para></listitem>
* <listitem><para>each line (either column or row) in reflowing will
* have the size of the biggest cell on that line; if the
* #ClutterFlowLayout:homogeneous property is set to %FALSE the actor
* will be allocated within that area, and if set to %TRUE instead the
* actor will be given exactly that area;</para></listitem>
* <listitem><para>the size of the columns or rows can be controlled
* for both minimum and maximum; the spacing can also be controlled
* in both columns and rows.</para></listitem>
* </itemizedlist>
*
* <figure id="flow-layout-image">
* <title>Horizontal flow layout</title>
* <para>The image shows a #ClutterFlowLayout with the
* #ClutterFlowLayout:orientation propert set to
* %CLUTTER_FLOW_HORIZONTAL.</para>
* <graphic fileref="flow-layout.png" format="PNG"/>
* </figure>
*
* <informalexample>
* <programlisting>
* <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../examples/flow-layout.c">
* <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
* </xi:include>
* </programlisting>
* </informalexample>
*
* #ClutterFlowLayout is available since Clutter 1.2
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include "clutter-actor.h"
#include "clutter-animatable.h"
#include "clutter-child-meta.h"
#include "clutter-container.h"
#include "clutter-debug.h"
#include "clutter-enum-types.h"
#include "clutter-flow-layout.h"
#include "clutter-layout-meta.h"
#include "clutter-private.h"
#define CLUTTER_FLOW_LAYOUT_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_FLOW_LAYOUT, ClutterFlowLayoutPrivate))
struct _ClutterFlowLayoutPrivate
{
ClutterContainer *container;
ClutterFlowOrientation orientation;
gfloat col_spacing;
gfloat row_spacing;
gfloat min_col_width;
gfloat max_col_width;
gfloat col_width;
gfloat min_row_height;
gfloat max_row_height;
gfloat row_height;
/* per-line size */
GArray *line_min;
GArray *line_natural;
gfloat req_width;
gfloat req_height;
guint line_count;
guint is_homogeneous : 1;
guint snap_to_grid : 1;
};
enum
{
PROP_0,
PROP_ORIENTATION,
PROP_HOMOGENEOUS,
PROP_COLUMN_SPACING,
PROP_ROW_SPACING,
PROP_MIN_COLUMN_WIDTH,
PROP_MAX_COLUMN_WIDTH,
PROP_MIN_ROW_HEGHT,
PROP_MAX_ROW_HEIGHT,
PROP_SNAP_TO_GRID,
N_PROPERTIES
};
static GParamSpec *flow_properties[N_PROPERTIES] = { NULL, };
G_DEFINE_TYPE (ClutterFlowLayout,
clutter_flow_layout,
CLUTTER_TYPE_LAYOUT_MANAGER);
static gint
get_columns (ClutterFlowLayout *self,
gfloat for_width)
{
ClutterFlowLayoutPrivate *priv = self->priv;
gint n_columns;
if (for_width < 0)
return 1;
if (priv->col_width == 0)
return 1;
n_columns = (gint) (for_width + priv->col_spacing)
/ (priv->col_width + priv->col_spacing);
if (n_columns == 0)
return 1;
return n_columns;
}
static gint
get_rows (ClutterFlowLayout *self,
gfloat for_height)
{
ClutterFlowLayoutPrivate *priv = self->priv;
gint n_rows;
if (for_height < 0)
return 1;
if (priv->row_height == 0)
return 1;
n_rows = (gint) (for_height + priv->row_spacing)
/ (priv->row_height + priv->row_spacing);
if (n_rows == 0)
return 1;
return n_rows;
}
static gint
compute_lines (ClutterFlowLayout *self,
gfloat avail_width,
gfloat avail_height)
{
ClutterFlowLayoutPrivate *priv = self->priv;
if (priv->orientation == CLUTTER_FLOW_HORIZONTAL)
return get_columns (self, avail_width);
else
return get_rows (self, avail_height);
}
static void
clutter_flow_layout_get_preferred_width (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_height,
gfloat *min_width_p,
gfloat *nat_width_p)
{
ClutterFlowLayoutPrivate *priv = CLUTTER_FLOW_LAYOUT (manager)->priv;
gint n_rows, line_item_count, line_count;
gfloat total_min_width, total_natural_width;
gfloat line_min_width, line_natural_width;
gfloat max_min_width, max_natural_width;
ClutterActor *actor, *child;
ClutterActorIter iter;
gfloat item_y;
n_rows = get_rows (CLUTTER_FLOW_LAYOUT (manager), for_height);
total_min_width = 0;
total_natural_width = 0;
line_min_width = 0;
line_natural_width = 0;
line_item_count = 0;
line_count = 0;
item_y = 0;
actor = CLUTTER_ACTOR (container);
/* clear the line width arrays */
if (priv->line_min != NULL)
g_array_free (priv->line_min, TRUE);
if (priv->line_natural != NULL)
g_array_free (priv->line_natural, TRUE);
priv->line_min = g_array_sized_new (FALSE, FALSE,
sizeof (gfloat),
16);
priv->line_natural = g_array_sized_new (FALSE, FALSE,
sizeof (gfloat),
16);
if (clutter_actor_get_n_children (actor) != 0)
line_count = 1;
max_min_width = max_natural_width = 0;
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_next (&iter, &child))
{
gfloat child_min, child_natural;
gfloat new_y, item_height;
if (!CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
if (priv->orientation == CLUTTER_FLOW_VERTICAL && for_height > 0)
{
clutter_actor_get_preferred_height (child, -1,
&child_min,
&child_natural);
if ((priv->snap_to_grid && line_item_count == n_rows) ||
(!priv->snap_to_grid && item_y + child_natural > for_height))
{
total_min_width += line_min_width;
total_natural_width += line_natural_width;
g_array_append_val (priv->line_min,
line_min_width);
g_array_append_val (priv->line_natural,
line_natural_width);
line_min_width = line_natural_width = 0;
line_item_count = 0;
line_count += 1;
item_y = 0;
}
if (priv->snap_to_grid)
{
new_y = ((line_item_count + 1) * (for_height + priv->row_spacing))
/ n_rows;
item_height = new_y - item_y - priv->row_spacing;
}
else
{
new_y = item_y + child_natural + priv->row_spacing;
item_height = child_natural;
}
clutter_actor_get_preferred_width (child, item_height,
&child_min,
&child_natural);
line_min_width = MAX (line_min_width, child_min);
line_natural_width = MAX (line_natural_width, child_natural);
item_y = new_y;
line_item_count += 1;
max_min_width = MAX (max_min_width, line_min_width);
max_natural_width = MAX (max_natural_width, line_natural_width);
}
else
{
clutter_actor_get_preferred_width (child, for_height,
&child_min,
&child_natural);
max_min_width = MAX (max_min_width, child_min);
max_natural_width = MAX (max_natural_width, child_natural);
total_min_width += max_min_width;
total_natural_width += max_natural_width;
line_count += 1;
}
}
priv->col_width = max_natural_width;
if (priv->max_col_width > 0 && priv->col_width > priv->max_col_width)
priv->col_width = MAX (priv->max_col_width, max_min_width);
if (priv->col_width < priv->min_col_width)
priv->col_width = priv->min_col_width;
if (priv->orientation == CLUTTER_FLOW_VERTICAL && for_height > 0)
{
/* if we have a non-full row we need to add it */
if (line_item_count > 0)
{
total_min_width += line_min_width;
total_natural_width += line_natural_width;
g_array_append_val (priv->line_min,
line_min_width);
g_array_append_val (priv->line_natural,
line_natural_width);
}
priv->line_count = line_count;
if (priv->line_count > 0)
{
gfloat total_spacing;
total_spacing = priv->col_spacing * (priv->line_count - 1);
total_min_width += total_spacing;
total_natural_width += total_spacing;
}
}
else
{
g_array_append_val (priv->line_min, line_min_width);
g_array_append_val (priv->line_natural, line_natural_width);
priv->line_count = line_count;
if (priv->line_count > 0)
{
gfloat total_spacing;
total_spacing = priv->col_spacing * (priv->line_count - 1);
total_min_width += total_spacing;
total_natural_width += total_spacing;
}
}
CLUTTER_NOTE (LAYOUT,
"Flow[w]: %d lines (%d per line): w [ %.2f, %.2f ] for h %.2f",
n_rows, priv->line_count,
total_min_width,
total_natural_width,
for_height);
priv->req_height = for_height;
if (min_width_p)
*min_width_p = max_min_width;
if (nat_width_p)
*nat_width_p = total_natural_width;
}
static void
clutter_flow_layout_get_preferred_height (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_width,
gfloat *min_height_p,
gfloat *nat_height_p)
{
ClutterFlowLayoutPrivate *priv = CLUTTER_FLOW_LAYOUT (manager)->priv;
gint n_columns, line_item_count, line_count;
gfloat total_min_height, total_natural_height;
gfloat line_min_height, line_natural_height;
gfloat max_min_height, max_natural_height;
ClutterActor *actor, *child;
ClutterActorIter iter;
gfloat item_x;
n_columns = get_columns (CLUTTER_FLOW_LAYOUT (manager), for_width);
total_min_height = 0;
total_natural_height = 0;
line_min_height = 0;
line_natural_height = 0;
line_item_count = 0;
line_count = 0;
item_x = 0;
actor = CLUTTER_ACTOR (container);
/* clear the line height arrays */
if (priv->line_min != NULL)
g_array_free (priv->line_min, TRUE);
if (priv->line_natural != NULL)
g_array_free (priv->line_natural, TRUE);
priv->line_min = g_array_sized_new (FALSE, FALSE,
sizeof (gfloat),
16);
priv->line_natural = g_array_sized_new (FALSE, FALSE,
sizeof (gfloat),
16);
if (clutter_actor_get_n_children (actor) != 0)
line_count = 1;
max_min_height = max_natural_height = 0;
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_next (&iter, &child))
{
gfloat child_min, child_natural;
gfloat new_x, item_width;
if (!CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
if (priv->orientation == CLUTTER_FLOW_HORIZONTAL && for_width > 0)
{
clutter_actor_get_preferred_width (child, -1,
&child_min,
&child_natural);
if ((priv->snap_to_grid && line_item_count == n_columns) ||
(!priv->snap_to_grid && item_x + child_natural > for_width))
{
total_min_height += line_min_height;
total_natural_height += line_natural_height;
g_array_append_val (priv->line_min,
line_min_height);
g_array_append_val (priv->line_natural,
line_natural_height);
line_min_height = line_natural_height = 0;
line_item_count = 0;
line_count += 1;
item_x = 0;
}
if (priv->snap_to_grid)
{
new_x = ((line_item_count + 1) * (for_width + priv->col_spacing))
/ n_columns;
item_width = new_x - item_x - priv->col_spacing;
}
else
{
new_x = item_x + child_natural + priv->col_spacing;
item_width = child_natural;
}
clutter_actor_get_preferred_height (child, item_width,
&child_min,
&child_natural);
line_min_height = MAX (line_min_height, child_min);
line_natural_height = MAX (line_natural_height, child_natural);
item_x = new_x;
line_item_count += 1;
max_min_height = MAX (max_min_height, line_min_height);
max_natural_height = MAX (max_natural_height, line_natural_height);
}
else
{
clutter_actor_get_preferred_height (child, for_width,
&child_min,
&child_natural);
max_min_height = MAX (max_min_height, child_min);
max_natural_height = MAX (max_natural_height, child_natural);
total_min_height += max_min_height;
total_natural_height += max_natural_height;
line_count += 1;
}
}
priv->row_height = max_natural_height;
if (priv->max_row_height > 0 && priv->row_height > priv->max_row_height)
priv->row_height = MAX (priv->max_row_height, max_min_height);
if (priv->row_height < priv->min_row_height)
priv->row_height = priv->min_row_height;
if (priv->orientation == CLUTTER_FLOW_HORIZONTAL && for_width > 0)
{
/* if we have a non-full row we need to add it */
if (line_item_count > 0)
{
total_min_height += line_min_height;
total_natural_height += line_natural_height;
g_array_append_val (priv->line_min,
line_min_height);
g_array_append_val (priv->line_natural,
line_natural_height);
}
priv->line_count = line_count;
if (priv->line_count > 0)
{
gfloat total_spacing;
total_spacing = priv->row_spacing * (priv->line_count - 1);
total_min_height += total_spacing;
total_natural_height += total_spacing;
}
}
else
{
g_array_append_val (priv->line_min, line_min_height);
g_array_append_val (priv->line_natural, line_natural_height);
priv->line_count = line_count;
if (priv->line_count > 0)
{
gfloat total_spacing;
total_spacing = priv->col_spacing * priv->line_count;
total_min_height += total_spacing;
total_natural_height += total_spacing;
}
}
CLUTTER_NOTE (LAYOUT,
"Flow[h]: %d lines (%d per line): w [ %.2f, %.2f ] for h %.2f",
n_columns, priv->line_count,
total_min_height,
total_natural_height,
for_width);
priv->req_width = for_width;
if (min_height_p)
*min_height_p = max_min_height;
if (nat_height_p)
*nat_height_p = total_natural_height;
}
static void
clutter_flow_layout_allocate (ClutterLayoutManager *manager,
ClutterContainer *container,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags)
{
ClutterFlowLayoutPrivate *priv = CLUTTER_FLOW_LAYOUT (manager)->priv;
ClutterActor *actor, *child;
ClutterActorIter iter;
gfloat x_off, y_off;
gfloat avail_width, avail_height;
gfloat item_x, item_y;
gint line_item_count;
gint items_per_line;
gint line_index;
actor = CLUTTER_ACTOR (container);
if (clutter_actor_get_n_children (actor) == 0)
return;
clutter_actor_box_get_origin (allocation, &x_off, &y_off);
clutter_actor_box_get_size (allocation, &avail_width, &avail_height);
/* blow the cached preferred size and re-compute with the given
* available size in case the FlowLayout wasn't given the exact
* size it requested
*/
if ((priv->req_width >= 0 && avail_width != priv->req_width) ||
(priv->req_height >= 0 && avail_height != priv->req_height))
{
clutter_flow_layout_get_preferred_width (manager, container,
avail_height,
NULL, NULL);
clutter_flow_layout_get_preferred_height (manager, container,
avail_width,
NULL, NULL);
}
items_per_line = compute_lines (CLUTTER_FLOW_LAYOUT (manager),
avail_width, avail_height);
item_x = x_off;
item_y = y_off;
line_item_count = 0;
line_index = 0;
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_next (&iter, &child))
{
ClutterActorBox child_alloc;
gfloat item_width, item_height;
gfloat new_x, new_y;
gfloat child_min, child_natural;
if (!CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
new_x = new_y = 0;
if (!priv->snap_to_grid)
clutter_actor_get_preferred_size (child,
NULL, NULL,
&item_width,
&item_height);
if (priv->orientation == CLUTTER_FLOW_HORIZONTAL)
{
if ((priv->snap_to_grid &&
line_item_count == items_per_line && line_item_count > 0) ||
(!priv->snap_to_grid && item_x + item_width > avail_width))
{
item_y += g_array_index (priv->line_natural,
gfloat,
line_index);
if (line_index >= 0)
item_y += priv->row_spacing;
line_item_count = 0;
line_index += 1;
item_x = x_off;
}
if (priv->snap_to_grid)
{
new_x = x_off + ((line_item_count + 1) * (avail_width + priv->col_spacing))
/ items_per_line;
item_width = new_x - item_x - priv->col_spacing;
}
else
{
new_x = item_x + item_width + priv->col_spacing;
}
item_height = g_array_index (priv->line_natural,
gfloat,
line_index);
}
else
{
if ((priv->snap_to_grid &&
line_item_count == items_per_line && line_item_count > 0) ||
(!priv->snap_to_grid && item_y + item_height > avail_height))
{
item_x += g_array_index (priv->line_natural,
gfloat,
line_index);
if (line_index >= 0)
item_x += priv->col_spacing;
line_item_count = 0;
line_index += 1;
item_y = y_off;
}
if (priv->snap_to_grid)
{
new_y = y_off + ((line_item_count + 1) * (avail_height + priv->row_spacing))
/ items_per_line;
item_height = new_y - item_y - priv->row_spacing;
}
else
{
new_y = item_y + item_height + priv->row_spacing;
}
item_width = g_array_index (priv->line_natural,
gfloat,
line_index);
}
if (!priv->is_homogeneous &&
!clutter_actor_needs_expand (child,
CLUTTER_ORIENTATION_HORIZONTAL))
{
clutter_actor_get_preferred_width (child, item_height,
&child_min,
&child_natural);
item_width = MIN (item_width, child_natural);
}
if (!priv->is_homogeneous &&
!clutter_actor_needs_expand (child,
CLUTTER_ORIENTATION_VERTICAL))
{
clutter_actor_get_preferred_height (child, item_width,
&child_min,
&child_natural);
item_height = MIN (item_height, child_natural);
}
CLUTTER_NOTE (LAYOUT,
"flow[line:%d, item:%d/%d] ="
"{ %.2f, %.2f, %.2f, %.2f }",
line_index, line_item_count + 1, items_per_line,
item_x, item_y, item_width, item_height);
child_alloc.x1 = ceil (item_x);
child_alloc.y1 = ceil (item_y);
child_alloc.x2 = ceil (child_alloc.x1 + item_width);
child_alloc.y2 = ceil (child_alloc.y1 + item_height);
clutter_actor_allocate (child, &child_alloc, flags);
if (priv->orientation == CLUTTER_FLOW_HORIZONTAL)
item_x = new_x;
else
item_y = new_y;
line_item_count += 1;
}
}
static void
clutter_flow_layout_set_container (ClutterLayoutManager *manager,
ClutterContainer *container)
{
ClutterFlowLayoutPrivate *priv = CLUTTER_FLOW_LAYOUT (manager)->priv;
ClutterLayoutManagerClass *parent_class;
priv->container = container;
if (priv->container != NULL)
{
ClutterRequestMode request_mode;
/* we need to change the :request-mode of the container
* to match the orientation
*/
request_mode = (priv->orientation == CLUTTER_FLOW_HORIZONTAL)
? CLUTTER_REQUEST_HEIGHT_FOR_WIDTH
: CLUTTER_REQUEST_WIDTH_FOR_HEIGHT;
clutter_actor_set_request_mode (CLUTTER_ACTOR (priv->container),
request_mode);
}
parent_class = CLUTTER_LAYOUT_MANAGER_CLASS (clutter_flow_layout_parent_class);
parent_class->set_container (manager, container);
}
static void
clutter_flow_layout_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterFlowLayout *self = CLUTTER_FLOW_LAYOUT (gobject);
switch (prop_id)
{
case PROP_ORIENTATION:
clutter_flow_layout_set_orientation (self, g_value_get_enum (value));
break;
case PROP_HOMOGENEOUS:
clutter_flow_layout_set_homogeneous (self, g_value_get_boolean (value));
break;
case PROP_COLUMN_SPACING:
clutter_flow_layout_set_column_spacing (self, g_value_get_float (value));
break;
case PROP_ROW_SPACING:
clutter_flow_layout_set_row_spacing (self, g_value_get_float (value));
break;
case PROP_MIN_COLUMN_WIDTH:
clutter_flow_layout_set_column_width (self,
g_value_get_float (value),
self->priv->max_col_width);
break;
case PROP_MAX_COLUMN_WIDTH:
clutter_flow_layout_set_column_width (self,
self->priv->min_col_width,
g_value_get_float (value));
break;
case PROP_MIN_ROW_HEGHT:
clutter_flow_layout_set_row_height (self,
g_value_get_float (value),
self->priv->max_row_height);
break;
case PROP_MAX_ROW_HEIGHT:
clutter_flow_layout_set_row_height (self,
self->priv->min_row_height,
g_value_get_float (value));
break;
case PROP_SNAP_TO_GRID:
clutter_flow_layout_set_snap_to_grid (self,
g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_flow_layout_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterFlowLayoutPrivate *priv = CLUTTER_FLOW_LAYOUT (gobject)->priv;
switch (prop_id)
{
case PROP_ORIENTATION:
g_value_set_enum (value, priv->orientation);
break;
case PROP_HOMOGENEOUS:
g_value_set_boolean (value, priv->is_homogeneous);
break;
case PROP_COLUMN_SPACING:
g_value_set_float (value, priv->col_spacing);
break;
case PROP_ROW_SPACING:
g_value_set_float (value, priv->row_spacing);
break;
case PROP_MIN_COLUMN_WIDTH:
g_value_set_float (value, priv->min_col_width);
break;
case PROP_MAX_COLUMN_WIDTH:
g_value_set_float (value, priv->max_col_width);
break;
case PROP_MIN_ROW_HEGHT:
g_value_set_float (value, priv->min_row_height);
break;
case PROP_MAX_ROW_HEIGHT:
g_value_set_float (value, priv->max_row_height);
break;
case PROP_SNAP_TO_GRID:
g_value_set_boolean (value, priv->snap_to_grid);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_flow_layout_finalize (GObject *gobject)
{
ClutterFlowLayoutPrivate *priv = CLUTTER_FLOW_LAYOUT (gobject)->priv;
if (priv->line_min != NULL)
g_array_free (priv->line_min, TRUE);
if (priv->line_natural != NULL)
g_array_free (priv->line_natural, TRUE);
G_OBJECT_CLASS (clutter_flow_layout_parent_class)->finalize (gobject);
}
static void
clutter_flow_layout_class_init (ClutterFlowLayoutClass *klass)
{
GObjectClass *gobject_class;
ClutterLayoutManagerClass *layout_class;
g_type_class_add_private (klass, sizeof (ClutterFlowLayoutPrivate));
gobject_class = G_OBJECT_CLASS (klass);
layout_class = CLUTTER_LAYOUT_MANAGER_CLASS (klass);
layout_class->get_preferred_width =
clutter_flow_layout_get_preferred_width;
layout_class->get_preferred_height =
clutter_flow_layout_get_preferred_height;
layout_class->allocate = clutter_flow_layout_allocate;
layout_class->set_container = clutter_flow_layout_set_container;
/**
* ClutterFlowLayout:orientation:
*
* The orientation of the #ClutterFlowLayout. The children
* of the layout will be layed out following the orientation.
*
* This property also controls the overflowing directions
*
*
*/
flow_properties[PROP_ORIENTATION] =
g_param_spec_enum ("orientation",
P_("Orientation"),
P_("The orientation of the layout"),
CLUTTER_TYPE_FLOW_ORIENTATION,
CLUTTER_FLOW_HORIZONTAL,
CLUTTER_PARAM_READWRITE | G_PARAM_CONSTRUCT);
/**
* ClutterFlowLayout:homogeneous:
*
* Whether each child inside the #ClutterFlowLayout should receive
* the same allocation
*
*
*/
flow_properties[PROP_HOMOGENEOUS] =
g_param_spec_boolean ("homogeneous",
P_("Homogeneous"),
P_("Whether each item should receive the same allocation"),
FALSE,
CLUTTER_PARAM_READWRITE);
/**
* ClutterFlowLayout:column-spacing:
*
* The spacing between columns, in pixels; the value of this
* property is honoured by horizontal non-overflowing layouts
* and by vertical overflowing layouts
*
*
*/
flow_properties[PROP_COLUMN_SPACING] =
g_param_spec_float ("column-spacing",
P_("Column Spacing"),
P_("The spacing between columns"),
0.0, G_MAXFLOAT,
0.0,
CLUTTER_PARAM_READWRITE);
/**
* ClutterFlowLayout:row-spacing:
*
* The spacing between rows, in pixels; the value of this
* property is honoured by vertical non-overflowing layouts and
* by horizontal overflowing layouts
*
*
*/
flow_properties[PROP_ROW_SPACING] =
g_param_spec_float ("row-spacing",
P_("Row Spacing"),
P_("The spacing between rows"),
0.0, G_MAXFLOAT,
0.0,
CLUTTER_PARAM_READWRITE);
/**
* ClutterFlowLayout:min-column-width:
*
* Minimum width for each column in the layout, in pixels
*
*
*/
flow_properties[PROP_MIN_COLUMN_WIDTH] =
g_param_spec_float ("min-column-width",
P_("Minimum Column Width"),
P_("Minimum width for each column"),
0.0, G_MAXFLOAT,
0.0,
CLUTTER_PARAM_READWRITE);
/**
* ClutterFlowLayout:max-column-width:
*
* Maximum width for each column in the layout, in pixels. If
* set to -1 the width will be the maximum child width
*
*
*/
flow_properties[PROP_MAX_COLUMN_WIDTH] =
g_param_spec_float ("max-column-width",
P_("Maximum Column Width"),
P_("Maximum width for each column"),
-1.0, G_MAXFLOAT,
-1.0,
CLUTTER_PARAM_READWRITE);
/**
* ClutterFlowLayout:min-row-height:
*
* Minimum height for each row in the layout, in pixels
*
*
*/
flow_properties[PROP_MIN_ROW_HEGHT] =
g_param_spec_float ("min-row-height",
P_("Minimum Row Height"),
P_("Minimum height for each row"),
0.0, G_MAXFLOAT,
0.0,
CLUTTER_PARAM_READWRITE);
/**
* ClutterFlowLayout:max-row-height:
*
* Maximum height for each row in the layout, in pixels. If
* set to -1 the width will be the maximum child height
*
*
*/
flow_properties[PROP_MAX_ROW_HEIGHT] =
g_param_spec_float ("max-row-height",
P_("Maximum Row Height"),
P_("Maximum height for each row"),
-1.0, G_MAXFLOAT,
-1.0,
CLUTTER_PARAM_READWRITE);
/**
* ClutterFlowLayout:snap-to-grid:
*
* Whether the #ClutterFlowLayout should arrange its children
* on a grid
*
* Since: 1.16
*/
flow_properties[PROP_SNAP_TO_GRID] =
g_param_spec_boolean ("snap-to-grid",
P_("Snap to grid"),
P_("Snap to grid"),
TRUE,
CLUTTER_PARAM_READWRITE);
gobject_class->finalize = clutter_flow_layout_finalize;
gobject_class->set_property = clutter_flow_layout_set_property;
gobject_class->get_property = clutter_flow_layout_get_property;
g_object_class_install_properties (gobject_class,
N_PROPERTIES,
flow_properties);
}
static void
clutter_flow_layout_init (ClutterFlowLayout *self)
{
ClutterFlowLayoutPrivate *priv;
self->priv = priv = CLUTTER_FLOW_LAYOUT_GET_PRIVATE (self);
priv->orientation = CLUTTER_FLOW_HORIZONTAL;
priv->col_spacing = 0;
priv->row_spacing = 0;
priv->min_col_width = priv->min_row_height = 0;
priv->max_col_width = priv->max_row_height = -1;
priv->line_min = NULL;
priv->line_natural = NULL;
priv->snap_to_grid = TRUE;
}
/**
* clutter_flow_layout_new:
* @orientation: the orientation of the flow layout
*
* Creates a new #ClutterFlowLayout with the given @orientation
*
* Return value: the newly created #ClutterFlowLayout
*
*
*/
ClutterLayoutManager *
clutter_flow_layout_new (ClutterFlowOrientation orientation)
{
return g_object_new (CLUTTER_TYPE_FLOW_LAYOUT,
"orientation", orientation,
NULL);
}
/**
* clutter_flow_layout_set_orientation:
* @layout: a #ClutterFlowLayout
* @orientation: the orientation of the layout
*
* Sets the orientation of the flow layout
*
* The orientation controls the direction used to allocate
* the children: either horizontally or vertically. The
* orientation also controls the direction of the overflowing
*
*
*/
void
clutter_flow_layout_set_orientation (ClutterFlowLayout *layout,
ClutterFlowOrientation orientation)
{
ClutterFlowLayoutPrivate *priv;
g_return_if_fail (CLUTTER_IS_FLOW_LAYOUT (layout));
priv = layout->priv;
if (priv->orientation != orientation)
{
ClutterLayoutManager *manager;
priv->orientation = orientation;
if (priv->container != NULL)
{
ClutterRequestMode request_mode;
/* we need to change the :request-mode of the container
* to match the orientation
*/
request_mode = (priv->orientation == CLUTTER_FLOW_HORIZONTAL)
? CLUTTER_REQUEST_HEIGHT_FOR_WIDTH
: CLUTTER_REQUEST_WIDTH_FOR_HEIGHT;
clutter_actor_set_request_mode (CLUTTER_ACTOR (priv->container),
request_mode);
}
manager = CLUTTER_LAYOUT_MANAGER (layout);
clutter_layout_manager_layout_changed (manager);
g_object_notify_by_pspec (G_OBJECT (layout),
flow_properties[PROP_ORIENTATION]);
}
}
/**
* clutter_flow_layout_get_orientation:
* @layout: a #ClutterFlowLayout
*
* Retrieves the orientation of the @layout
*
* Return value: the orientation of the #ClutterFlowLayout
*
*
*/
ClutterFlowOrientation
clutter_flow_layout_get_orientation (ClutterFlowLayout *layout)
{
g_return_val_if_fail (CLUTTER_IS_FLOW_LAYOUT (layout),
CLUTTER_FLOW_HORIZONTAL);
return layout->priv->orientation;
}
/**
* clutter_flow_layout_set_homogeneous:
* @layout: a #ClutterFlowLayout
* @homogeneous: whether the layout should be homogeneous or not
*
* Sets whether the @layout should allocate the same space for
* each child
*
*
*/
void
clutter_flow_layout_set_homogeneous (ClutterFlowLayout *layout,
gboolean homogeneous)
{
ClutterFlowLayoutPrivate *priv;
g_return_if_fail (CLUTTER_IS_FLOW_LAYOUT (layout));
priv = layout->priv;
if (priv->is_homogeneous != homogeneous)
{
ClutterLayoutManager *manager;
priv->is_homogeneous = homogeneous;
manager = CLUTTER_LAYOUT_MANAGER (layout);
clutter_layout_manager_layout_changed (manager);
g_object_notify_by_pspec (G_OBJECT (layout),
flow_properties[PROP_HOMOGENEOUS]);
}
}
/**
* clutter_flow_layout_get_homogeneous:
* @layout: a #ClutterFlowLayout
*
* Retrieves whether the @layout is homogeneous
*
* Return value: %TRUE if the #ClutterFlowLayout is homogeneous
*
*
*/
gboolean
clutter_flow_layout_get_homogeneous (ClutterFlowLayout *layout)
{
g_return_val_if_fail (CLUTTER_IS_FLOW_LAYOUT (layout), FALSE);
return layout->priv->is_homogeneous;
}
/**
* clutter_flow_layout_set_column_spacing:
* @layout: a #ClutterFlowLayout
* @spacing: the space between columns
*
* Sets the space between columns, in pixels
*
*
*/
void
clutter_flow_layout_set_column_spacing (ClutterFlowLayout *layout,
gfloat spacing)
{
ClutterFlowLayoutPrivate *priv;
g_return_if_fail (CLUTTER_IS_FLOW_LAYOUT (layout));
priv = layout->priv;
if (priv->col_spacing != spacing)
{
ClutterLayoutManager *manager;
priv->col_spacing = spacing;
manager = CLUTTER_LAYOUT_MANAGER (layout);
clutter_layout_manager_layout_changed (manager);
g_object_notify_by_pspec (G_OBJECT (layout),
flow_properties[PROP_COLUMN_SPACING]);
}
}
/**
* clutter_flow_layout_get_column_spacing:
* @layout: a #ClutterFlowLayout
*
* Retrieves the spacing between columns
*
* Return value: the spacing between columns of the #ClutterFlowLayout,
* in pixels
*
*
*/
gfloat
clutter_flow_layout_get_column_spacing (ClutterFlowLayout *layout)
{
g_return_val_if_fail (CLUTTER_IS_FLOW_LAYOUT (layout), 0.0);
return layout->priv->col_spacing;
}
/**
* clutter_flow_layout_set_row_spacing:
* @layout: a #ClutterFlowLayout
* @spacing: the space between rows
*
* Sets the spacing between rows, in pixels
*
*
*/
void
clutter_flow_layout_set_row_spacing (ClutterFlowLayout *layout,
gfloat spacing)
{
ClutterFlowLayoutPrivate *priv;
g_return_if_fail (CLUTTER_IS_FLOW_LAYOUT (layout));
priv = layout->priv;
if (priv->row_spacing != spacing)
{
ClutterLayoutManager *manager;
priv->row_spacing = spacing;
manager = CLUTTER_LAYOUT_MANAGER (layout);
clutter_layout_manager_layout_changed (manager);
g_object_notify_by_pspec (G_OBJECT (layout),
flow_properties[PROP_ROW_SPACING]);
}
}
/**
* clutter_flow_layout_get_row_spacing:
* @layout: a #ClutterFlowLayout
*
* Retrieves the spacing between rows
*
* Return value: the spacing between rows of the #ClutterFlowLayout,
* in pixels
*
*
*/
gfloat
clutter_flow_layout_get_row_spacing (ClutterFlowLayout *layout)
{
g_return_val_if_fail (CLUTTER_IS_FLOW_LAYOUT (layout), 0.0);
return layout->priv->row_spacing;
}
/**
* clutter_flow_layout_set_column_width:
* @layout: a #ClutterFlowLayout
* @min_width: minimum width of a column
* @max_width: maximum width of a column
*
* Sets the minimum and maximum widths that a column can have
*
*
*/
void
clutter_flow_layout_set_column_width (ClutterFlowLayout *layout,
gfloat min_width,
gfloat max_width)
{
ClutterFlowLayoutPrivate *priv;
gboolean notify_min = FALSE, notify_max = FALSE;
g_return_if_fail (CLUTTER_IS_FLOW_LAYOUT (layout));
priv = layout->priv;
if (priv->min_col_width != min_width)
{
priv->min_col_width = min_width;
notify_min = TRUE;
}
if (priv->max_col_width != max_width)
{
priv->max_col_width = max_width;
notify_max = TRUE;
}
g_object_freeze_notify (G_OBJECT (layout));
if (notify_min || notify_max)
{
ClutterLayoutManager *manager = CLUTTER_LAYOUT_MANAGER (layout);
clutter_layout_manager_layout_changed (manager);
}
if (notify_min)
g_object_notify_by_pspec (G_OBJECT (layout),
flow_properties[PROP_MIN_COLUMN_WIDTH]);
if (notify_max)
g_object_notify_by_pspec (G_OBJECT (layout),
flow_properties[PROP_MAX_COLUMN_WIDTH]);
g_object_thaw_notify (G_OBJECT (layout));
}
/**
* clutter_flow_layout_get_column_width:
* @layout: a #ClutterFlowLayout
* @min_width: (out): return location for the minimum column width, or %NULL
* @max_width: (out): return location for the maximum column width, or %NULL
*
* Retrieves the minimum and maximum column widths
*
*
*/
void
clutter_flow_layout_get_column_width (ClutterFlowLayout *layout,
gfloat *min_width,
gfloat *max_width)
{
g_return_if_fail (CLUTTER_IS_FLOW_LAYOUT (layout));
if (min_width)
*min_width = layout->priv->min_col_width;
if (max_width)
*max_width = layout->priv->max_col_width;
}
/**
* clutter_flow_layout_set_row_height:
* @layout: a #ClutterFlowLayout
* @min_height: the minimum height of a row
* @max_height: the maximum height of a row
*
* Sets the minimum and maximum heights that a row can have
*
*
*/
void
clutter_flow_layout_set_row_height (ClutterFlowLayout *layout,
gfloat min_height,
gfloat max_height)
{
ClutterFlowLayoutPrivate *priv;
gboolean notify_min = FALSE, notify_max = FALSE;
g_return_if_fail (CLUTTER_IS_FLOW_LAYOUT (layout));
priv = layout->priv;
if (priv->min_row_height != min_height)
{
priv->min_row_height = min_height;
notify_min = TRUE;
}
if (priv->max_row_height != max_height)
{
priv->max_row_height = max_height;
notify_max = TRUE;
}
g_object_freeze_notify (G_OBJECT (layout));
if (notify_min || notify_max)
{
ClutterLayoutManager *manager = CLUTTER_LAYOUT_MANAGER (layout);
clutter_layout_manager_layout_changed (manager);
}
if (notify_min)
g_object_notify_by_pspec (G_OBJECT (layout),
flow_properties[PROP_MIN_ROW_HEGHT]);
if (notify_max)
g_object_notify_by_pspec (G_OBJECT (layout),
flow_properties[PROP_MAX_ROW_HEIGHT]);
g_object_thaw_notify (G_OBJECT (layout));
}
/**
* clutter_flow_layout_get_row_height:
* @layout: a #ClutterFlowLayout
* @min_height: (out): return location for the minimum row height, or %NULL
* @max_height: (out): return location for the maximum row height, or %NULL
*
* Retrieves the minimum and maximum row heights
*
*
*/
void
clutter_flow_layout_get_row_height (ClutterFlowLayout *layout,
gfloat *min_height,
gfloat *max_height)
{
g_return_if_fail (CLUTTER_IS_FLOW_LAYOUT (layout));
if (min_height)
*min_height = layout->priv->min_row_height;
if (max_height)
*max_height = layout->priv->max_row_height;
}
/**
* clutter_flow_layout_set_snap_to_grid:
* @layout: a #ClutterFlowLayout
* @snap_to_grid: %TRUE if @layout should place its children on a grid
*
* Whether the @layout should place its children on a grid.
*
* Since: 1.16
*/
void
clutter_flow_layout_set_snap_to_grid (ClutterFlowLayout *layout,
gboolean snap_to_grid)
{
ClutterFlowLayoutPrivate *priv;
g_return_if_fail (CLUTTER_IS_FLOW_LAYOUT (layout));
priv = layout->priv;
if (priv->snap_to_grid != snap_to_grid)
{
priv->snap_to_grid = snap_to_grid;
clutter_layout_manager_layout_changed (CLUTTER_LAYOUT_MANAGER (layout));
g_object_notify_by_pspec (G_OBJECT (layout),
flow_properties[PROP_SNAP_TO_GRID]);
}
}
/**
* clutter_flow_layout_get_snap_to_grid:
* @layout: a #ClutterFlowLayout
*
* Retrieves the value of #ClutterFlowLayout:snap-to-grid property
*
* Return value: %TRUE if the @layout is placing its children on a grid
*
* Since: 1.16
*/
gboolean
clutter_flow_layout_get_snap_to_grid (ClutterFlowLayout *layout)
{
g_return_val_if_fail (CLUTTER_IS_FLOW_LAYOUT (layout), FALSE);
return layout->priv->snap_to_grid;
}
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