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gtk2/gtk/gtksizerequest.c
Murray Cumming ce815afece GtkWidget/GtkContainer: Slight fixes to geometry-management docs. 
Replace it's with its in several places.
Replace some , with .
Replace some ; with .
Fix some plurals.
Other minor corrections.
2010-11-05 22:19:50 +09:00

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/* gtksizerequest.c
* Copyright (C) 2007-2010 Openismus GmbH
*
* Authors:
* Mathias Hasselmann <mathias@openismus.com>
* Tristan Van Berkom <tristan.van.berkom@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include "gtksizerequest.h"
#include "gtkdebug.h"
#include "gtkintl.h"
#include "gtkprivate.h"
#include "gtksizegroup-private.h"
#include "gtkwidgetprivate.h"
/* looks for a cached size request for this for_size. If not
* found, returns the oldest entry so it can be overwritten
*
* Note that this caching code was directly derived from
* the Clutter toolkit.
*/
static gboolean
get_cached_size (SizeRequestCache *cache,
GtkSizeGroupMode orientation,
gint for_size,
SizeRequest **result)
{
guint i, n_sizes;
SizeRequest *cached_sizes;
if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
{
cached_sizes = cache->widths;
n_sizes = cache->cached_widths;
}
else
{
cached_sizes = cache->heights;
n_sizes = cache->cached_widths;
}
/* Search for an already cached size */
for (i = 0; i < n_sizes; i++)
{
if (cached_sizes[i].for_size == for_size)
{
*result = &cached_sizes[i];
return TRUE;
}
}
/* If not found, pull a new size from the cache, the returned size cache
* will immediately be used to cache the new computed size so we go ahead
* and increment the last_cached_width/height right away */
if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
{
if (cache->cached_widths < GTK_SIZE_REQUEST_CACHED_SIZES)
{
cache->cached_widths++;
cache->last_cached_width = cache->cached_widths - 1;
}
else
{
if (++cache->last_cached_width == GTK_SIZE_REQUEST_CACHED_SIZES)
cache->last_cached_width = 0;
}
*result = &cache->widths[cache->last_cached_width];
}
else /* GTK_SIZE_GROUP_VERTICAL */
{
if (cache->cached_heights < GTK_SIZE_REQUEST_CACHED_SIZES)
{
cache->cached_heights++;
cache->last_cached_height = cache->cached_heights - 1;
}
else
{
if (++cache->last_cached_height == GTK_SIZE_REQUEST_CACHED_SIZES)
cache->last_cached_height = 0;
}
*result = &cache->heights[cache->last_cached_height];
}
return FALSE;
}
extern guint _size_request_signal_id;
static void
do_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GtkWidgetClass *widget_class = g_type_class_peek (GTK_TYPE_WIDGET);
if (GTK_WIDGET_GET_CLASS (widget)->size_request != widget_class->size_request)
g_warning ("%s implements GtkWidgetClass::size_request which is deprecated and "
"will be removed in the next release",
G_OBJECT_TYPE_NAME (widget));
if (g_signal_has_handler_pending (widget, _size_request_signal_id, 0, TRUE))
g_warning ("A %s (%p) has handler(s) connected to the GtkWidgetClass::size-request signal which is "
"deprecated and will be removed in the next release",
G_OBJECT_TYPE_NAME (widget), widget);
/* Now we dont bother caching the deprecated "size-request" returns,
* just unconditionally invoke here just in case we run into legacy stuff */
gtk_widget_ensure_style (widget);
g_signal_emit_by_name (widget, "size-request", requisition);
}
#ifndef G_DISABLE_CHECKS
static GQuark recursion_check_quark = 0;
#endif /* G_DISABLE_CHECKS */
static void
push_recursion_check (GtkWidget *widget,
GtkSizeGroupMode orientation,
gint for_size)
{
#ifndef G_DISABLE_CHECKS
const char *previous_method;
const char *method;
if (recursion_check_quark == 0)
recursion_check_quark = g_quark_from_static_string ("gtk-size-request-in-progress");
previous_method = g_object_get_qdata (G_OBJECT (widget), recursion_check_quark);
if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
{
method = for_size < 0 ? "get_width" : "get_width_for_height";
}
else
{
method = for_size < 0 ? "get_height" : "get_height_for_width";
}
if (previous_method != NULL)
{
g_warning ("%s %p: widget tried to gtk_widget_%s inside "
" GtkWidget ::%s implementation. "
"Should just invoke GTK_WIDGET_GET_CLASS(widget)->%s "
"directly rather than using gtk_widget_%s",
G_OBJECT_TYPE_NAME (widget), widget,
method, previous_method,
method, method);
}
g_object_set_qdata (G_OBJECT (widget), recursion_check_quark, (char*) method);
#endif /* G_DISABLE_CHECKS */
}
static void
pop_recursion_check (GtkWidget *widget,
GtkSizeGroupMode orientation)
{
#ifndef G_DISABLE_CHECKS
g_object_set_qdata (G_OBJECT (widget), recursion_check_quark, NULL);
#endif
}
static void
compute_size_for_orientation (GtkWidget *widget,
GtkSizeGroupMode orientation,
gint for_size,
gint *minimum_size,
gint *natural_size)
{
SizeRequestCache *cache;
SizeRequest *cached_size;
gboolean found_in_cache = FALSE;
int adjusted_min, adjusted_natural;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (minimum_size != NULL || natural_size != NULL);
cache = _gtk_widget_peek_request_cache (widget);
if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
{
cached_size = &cache->widths[0];
if (!_gtk_widget_get_width_request_needed (widget))
found_in_cache = get_cached_size (cache, orientation, for_size, &cached_size);
else
{
memset (cache->widths, 0, GTK_SIZE_REQUEST_CACHED_SIZES * sizeof (SizeRequest));
cache->cached_widths = 1;
cache->last_cached_width = 0;
}
}
else
{
cached_size = &cache->heights[0];
if (!_gtk_widget_get_height_request_needed (widget))
found_in_cache = get_cached_size (cache, orientation, for_size, &cached_size);
else
{
memset (cache->heights, 0, GTK_SIZE_REQUEST_CACHED_SIZES * sizeof (SizeRequest));
cache->cached_heights = 1;
cache->last_cached_height = 0;
}
}
if (!found_in_cache)
{
GtkRequisition requisition = { 0, 0 };
gint min_size = 0, nat_size = 0;
gint requisition_size;
/* Unconditional size request runs but is often unhandled. */
do_size_request (widget, &requisition);
if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
{
requisition_size = requisition.width;
if (for_size < 0)
{
push_recursion_check (widget, orientation, for_size);
GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget, &min_size, &nat_size);
pop_recursion_check (widget, orientation);
}
else
{
int ignored_position = 0;
int natural_height;
/* Pull the base natural height from the cache as it's needed to adjust
* the proposed 'for_size' */
gtk_widget_get_preferred_height (widget, NULL, &natural_height);
/* convert for_size to unadjusted height (for_size is a proposed allocation) */
GTK_WIDGET_GET_CLASS (widget)->adjust_size_allocation (widget,
GTK_ORIENTATION_VERTICAL,
&natural_height,
&ignored_position,
&for_size);
push_recursion_check (widget, orientation, for_size);
GTK_WIDGET_GET_CLASS (widget)->get_preferred_width_for_height (widget, for_size,
&min_size, &nat_size);
pop_recursion_check (widget, orientation);
}
}
else
{
requisition_size = requisition.height;
if (for_size < 0)
{
push_recursion_check (widget, orientation, for_size);
GTK_WIDGET_GET_CLASS (widget)->get_preferred_height (widget, &min_size, &nat_size);
pop_recursion_check (widget, orientation);
}
else
{
int ignored_position = 0;
int natural_width;
/* Pull the base natural width from the cache as it's needed to adjust
* the proposed 'for_size' */
gtk_widget_get_preferred_width (widget, NULL, &natural_width);
/* convert for_size to unadjusted width (for_size is a proposed allocation) */
GTK_WIDGET_GET_CLASS (widget)->adjust_size_allocation (widget,
GTK_ORIENTATION_HORIZONTAL,
&natural_width,
&ignored_position,
&for_size);
push_recursion_check (widget, orientation, for_size);
GTK_WIDGET_GET_CLASS (widget)->get_preferred_height_for_width (widget, for_size,
&min_size, &nat_size);
pop_recursion_check (widget, orientation);
}
}
if (min_size > nat_size)
{
g_warning ("%s %p reported min size %d and natural size %d; natural size must be >= min size",
G_OBJECT_TYPE_NAME (widget), widget, min_size, nat_size);
}
/* Support for dangling "size-request" signal implementations on
* legacy widgets
*/
min_size = MAX (min_size, requisition_size);
nat_size = MAX (nat_size, requisition_size);
cached_size->minimum_size = min_size;
cached_size->natural_size = nat_size;
cached_size->for_size = for_size;
if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
_gtk_widget_set_width_request_needed (widget, FALSE);
else
_gtk_widget_set_height_request_needed (widget, FALSE);
adjusted_min = cached_size->minimum_size;
adjusted_natural = cached_size->natural_size;
GTK_WIDGET_GET_CLASS (widget)->adjust_size_request (widget,
orientation == GTK_SIZE_GROUP_HORIZONTAL ?
GTK_ORIENTATION_HORIZONTAL :
GTK_ORIENTATION_VERTICAL,
&adjusted_min,
&adjusted_natural);
if (adjusted_min < cached_size->minimum_size ||
adjusted_natural < cached_size->natural_size)
{
g_warning ("%s %p adjusted size %s min %d natural %d must not decrease below min %d natural %d",
G_OBJECT_TYPE_NAME (widget), widget,
orientation == GTK_SIZE_GROUP_VERTICAL ? "vertical" : "horizontal",
adjusted_min, adjusted_natural,
cached_size->minimum_size, cached_size->natural_size);
/* don't use the adjustment */
}
else if (adjusted_min > adjusted_natural)
{
g_warning ("%s %p adjusted size %s min %d natural %d original min %d natural %d has min greater than natural",
G_OBJECT_TYPE_NAME (widget), widget,
orientation == GTK_SIZE_GROUP_VERTICAL ? "vertical" : "horizontal",
adjusted_min, adjusted_natural,
cached_size->minimum_size, cached_size->natural_size);
/* don't use the adjustment */
}
else
{
/* adjustment looks good */
cached_size->minimum_size = adjusted_min;
cached_size->natural_size = adjusted_natural;
}
/* Update size-groups with our request and update our cached requests
* with the size-group values in a single pass.
*/
_gtk_size_group_bump_requisition (widget,
orientation,
&cached_size->minimum_size,
&cached_size->natural_size);
}
if (minimum_size)
*minimum_size = cached_size->minimum_size;
if (natural_size)
*natural_size = cached_size->natural_size;
g_assert (cached_size->minimum_size <= cached_size->natural_size);
GTK_NOTE (SIZE_REQUEST,
g_print ("[%p] %s\t%s: %d is minimum %d and natural: %d (hit cache: %s)\n",
widget, G_OBJECT_TYPE_NAME (widget),
orientation == GTK_SIZE_GROUP_HORIZONTAL ?
"width for height" : "height for width" ,
for_size,
cached_size->minimum_size,
cached_size->natural_size,
found_in_cache ? "yes" : "no"));
}
/**
* gtk_widget_get_request_mode:
* @widget: a #GtkWidget instance
*
* Gets whether the widget prefers a height-for-width layout
* or a width-for-height layout.
*
* <note><para>#GtkBin widgets generally propagate the preference of
* their child, container widgets need to request something either in
* context of their children or in context of their allocation
* capabilities.</para></note>
*
* Returns: The #GtkSizeRequestMode preferred by @widget.
*
* Since: 3.0
*/
GtkSizeRequestMode
gtk_widget_get_request_mode (GtkWidget *widget)
{
GtkWidgetClass *klass;
g_return_val_if_fail (GTK_IS_WIDGET (widget), GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH);
klass = GTK_WIDGET_GET_CLASS (widget);
if (klass->get_request_mode)
return klass->get_request_mode (widget);
/* By default widgets are height-for-width. */
return GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH;
}
/**
* gtk_widget_get_preferred_width:
* @widget: a #GtkWidget instance
* @minimum_width: (out) (allow-none): location to store the minimum width, or %NULL
* @natural_width: (out) (allow-none): location to store the natural width, or %NULL
*
* Retrieves a widget's initial minimum and natural width.
*
* <note><para>This call is specific to height-for-width
* requests.</para></note>
*
* The returned request will be modified by the
* GtkWidgetClass::adjust_size_request virtual method and by any
* #GtkSizeGroup<!-- -->s that have been applied. That is, the returned request
* is the one that should be used for layout, not necessarily the one
* returned by the widget itself.
*
* Since: 3.0
*/
void
gtk_widget_get_preferred_width (GtkWidget *widget,
gint *minimum_width,
gint *natural_width)
{
compute_size_for_orientation (widget, GTK_SIZE_GROUP_HORIZONTAL,
-1, minimum_width, natural_width);
}
/**
* gtk_widget_get_preferred_height:
* @widget: a #GtkWidget instance
* @minimum_height: (out) (allow-none): location to store the minimum height, or %NULL
* @natural_height: (out) (allow-none): location to store the natural height, or %NULL
*
* Retrieves a widget's initial minimum and natural height.
*
* <note><para>This call is specific to width-for-height requests.</para></note>
*
* The returned request will be modified by the
* GtkWidgetClass::adjust_size_request virtual method and by any
* #GtkSizeGroup<!-- -->s that have been applied. That is, the returned request
* is the one that should be used for layout, not necessarily the one
* returned by the widget itself.
*
* Since: 3.0
*/
void
gtk_widget_get_preferred_height (GtkWidget *widget,
gint *minimum_height,
gint *natural_height)
{
compute_size_for_orientation (widget, GTK_SIZE_GROUP_VERTICAL,
-1, minimum_height, natural_height);
}
/**
* gtk_widget_get_preferred_width_for_height:
* @widget: a #GtkWidget instance
* @height: the height which is available for allocation
* @minimum_width: (out) (allow-none): location for storing the minimum width, or %NULL
* @natural_width: (out) (allow-none): location for storing the natural width, or %NULL
*
* Retrieves a widget's minimum and natural width if it would be given
* the specified @height.
*
* The returned request will be modified by the
* GtkWidgetClass::adjust_size_request virtual method and by any
* #GtkSizeGroup<!-- -->s that have been applied. That is, the returned request
* is the one that should be used for layout, not necessarily the one
* returned by the widget itself.
*
* Since: 3.0
*/
void
gtk_widget_get_preferred_width_for_height (GtkWidget *widget,
gint height,
gint *minimum_width,
gint *natural_width)
{
compute_size_for_orientation (widget, GTK_SIZE_GROUP_HORIZONTAL,
height, minimum_width, natural_width);
}
/**
* gtk_widget_get_preferred_height_for_width:
* @widget: a #GtkWidget instance
* @width: the width which is available for allocation
* @minimum_height: (out) (allow-none): location for storing the minimum height, or %NULL
* @natural_height: (out) (allow-none): location for storing the natural height, or %NULL
*
* Retrieves a widget's minimum and natural height if it would be given
* the specified @width.
*
* The returned request will be modified by the
* GtkWidgetClass::adjust_size_request virtual method and by any
* #GtkSizeGroup<!-- -->s that have been applied. That is, the returned request
* is the one that should be used for layout, not necessarily the one
* returned by the widget itself.
*
* Since: 3.0
*/
void
gtk_widget_get_preferred_height_for_width (GtkWidget *widget,
gint width,
gint *minimum_height,
gint *natural_height)
{
compute_size_for_orientation (widget, GTK_SIZE_GROUP_VERTICAL,
width, minimum_height, natural_height);
}
/**
* gtk_widget_get_preferred_size:
* @widget: a #GtkWidget instance
* @minimum_size: (out) (allow-none): location for storing the minimum size, or %NULL
* @natural_size: (out) (allow-none): location for storing the natural size, or %NULL
*
* Retrieves the minimum and natural size of a widget, taking
* into account the widget's preference for height-for-width management.
*
* This is used to retrieve a suitable size by container widgets which do
* not impose any restrictions on the child placement. It can be used
* to deduce toplevel window and menu sizes as well as child widgets in
* free-form containers such as GtkLayout.
*
* <note><para>Handle with care. Note that the natural height of a height-for-width
* widget will generally be a smaller size than the minimum height, since the required
* height for the natural width is generally smaller than the required height for
* the minimum width.</para></note>
*
* Since: 3.0
*/
void
gtk_widget_get_preferred_size (GtkWidget *widget,
GtkRequisition *minimum_size,
GtkRequisition *natural_size)
{
gint min_width, nat_width;
gint min_height, nat_height;
g_return_if_fail (GTK_IS_WIDGET (widget));
if (gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
{
gtk_widget_get_preferred_width (widget, &min_width, &nat_width);
if (minimum_size)
{
minimum_size->width = min_width;
gtk_widget_get_preferred_height_for_width (widget, min_width,
&minimum_size->height, NULL);
}
if (natural_size)
{
natural_size->width = nat_width;
gtk_widget_get_preferred_height_for_width (widget, nat_width,
NULL, &natural_size->height);
}
}
else /* GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT */
{
gtk_widget_get_preferred_height (widget, &min_height, &nat_height);
if (minimum_size)
{
minimum_size->height = min_height;
gtk_widget_get_preferred_width_for_height (widget, min_height,
&minimum_size->width, NULL);
}
if (natural_size)
{
natural_size->height = nat_height;
gtk_widget_get_preferred_width_for_height (widget, nat_height,
NULL, &natural_size->width);
}
}
}
static gint
compare_gap (gconstpointer p1,
gconstpointer p2,
gpointer data)
{
GtkRequestedSize *sizes = data;
const guint *c1 = p1;
const guint *c2 = p2;
const gint d1 = MAX (sizes[*c1].natural_size -
sizes[*c1].minimum_size,
0);
const gint d2 = MAX (sizes[*c2].natural_size -
sizes[*c2].minimum_size,
0);
gint delta = (d2 - d1);
if (0 == delta)
delta = (*c2 - *c1);
return delta;
}
/**
* gtk_distribute_natural_allocation:
* @extra_space: Extra space to redistribute among children after subtracting
* minimum sizes and any child padding from the overall allocation
* @n_requested_sizes: Number of requests to fit into the allocation
* @sizes: An array of structs with a client pointer and a minimum/natural size
* in the orientation of the allocation.
*
* Distributes @extra_space to child @sizes by bringing smaller
* children up to natural size first.
*
* The remaining space will be added to the @minimum_size member of the
* GtkRequestedSize struct. If all sizes reach their natural size then
* the remaining space is returned.
*
* Returns: The remainder of @extra_space after redistributing space
* to @sizes.
*/
gint
gtk_distribute_natural_allocation (gint extra_space,
guint n_requested_sizes,
GtkRequestedSize *sizes)
{
guint *spreading;
gint i;
g_return_val_if_fail (extra_space >= 0, 0);
spreading = g_newa (guint, n_requested_sizes);
for (i = 0; i < n_requested_sizes; i++)
spreading[i] = i;
/* Distribute the container's extra space c_gap. We want to assign
* this space such that the sum of extra space assigned to children
* (c^i_gap) is equal to c_cap. The case that there's not enough
* space for all children to take their natural size needs some
* attention. The goals we want to achieve are:
*
* a) Maximize number of children taking their natural size.
* b) The allocated size of children should be a continuous
* function of c_gap. That is, increasing the container size by
* one pixel should never make drastic changes in the distribution.
* c) If child i takes its natural size and child j doesn't,
* child j should have received at least as much gap as child i.
*
* The following code distributes the additional space by following
* these rules.
*/
/* Sort descending by gap and position. */
g_qsort_with_data (spreading,
n_requested_sizes, sizeof (guint),
compare_gap, sizes);
/* Distribute available space.
* This master piece of a loop was conceived by Behdad Esfahbod.
*/
for (i = n_requested_sizes - 1; extra_space > 0 && i >= 0; --i)
{
/* Divide remaining space by number of remaining children.
* Sort order and reducing remaining space by assigned space
* ensures that space is distributed equally.
*/
gint glue = (extra_space + i) / (i + 1);
gint gap = sizes[(spreading[i])].natural_size
- sizes[(spreading[i])].minimum_size;
gint extra = MIN (glue, gap);
sizes[spreading[i]].minimum_size += extra;
extra_space -= extra;
}
return extra_space;
}
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