forked from AuroraMiddleware/gtk
824 lines
27 KiB
C
824 lines
27 KiB
C
/* gtksizerequest.c
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* Copyright (C) 2007-2010 Openismus GmbH
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*
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* Authors:
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* Mathias Hasselmann <mathias@openismus.com>
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* Tristan Van Berkom <tristan.van.berkom@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <config.h>
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#include "gtksizerequest.h"
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#include "gtkdebug.h"
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#include "gtkintl.h"
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#include "gtkprivate.h"
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#include "gtksizegroup-private.h"
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#include "gtkwidgetprivate.h"
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#include "deprecated/gtkstyle.h"
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#ifndef G_DISABLE_CHECKS
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static GQuark recursion_check_quark = 0;
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#endif /* G_DISABLE_CHECKS */
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static void
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push_recursion_check (GtkWidget *widget,
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GtkSizeGroupMode orientation,
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gint for_size)
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{
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#ifndef G_DISABLE_CHECKS
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const char *previous_method;
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const char *method;
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if (recursion_check_quark == 0)
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recursion_check_quark = g_quark_from_static_string ("gtk-size-request-in-progress");
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previous_method = g_object_get_qdata (G_OBJECT (widget), recursion_check_quark);
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if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
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{
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method = for_size < 0 ? "get_width" : "get_width_for_height";
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}
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else
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{
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method = for_size < 0 ? "get_height" : "get_height_for_width";
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}
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if (previous_method != NULL)
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{
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g_warning ("%s %p: widget tried to gtk_widget_%s inside "
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" GtkWidget ::%s implementation. "
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"Should just invoke GTK_WIDGET_GET_CLASS(widget)->%s "
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"directly rather than using gtk_widget_%s",
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G_OBJECT_TYPE_NAME (widget), widget,
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method, previous_method,
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method, method);
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}
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g_object_set_qdata (G_OBJECT (widget), recursion_check_quark, (char*) method);
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#endif /* G_DISABLE_CHECKS */
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}
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static void
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pop_recursion_check (GtkWidget *widget,
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GtkSizeGroupMode orientation)
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{
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#ifndef G_DISABLE_CHECKS
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g_object_set_qdata (G_OBJECT (widget), recursion_check_quark, NULL);
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#endif
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}
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static void
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clear_cache (SizeRequestCache *cache,
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GtkSizeGroupMode orientation)
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{
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SizeRequest **sizes;
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gint i;
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if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
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{
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sizes = cache->widths;
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cache->widths = NULL;
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cache->cached_widths = 0;
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cache->last_cached_width = 0;
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cache->cached_base_width = FALSE;
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}
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else
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{
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sizes = cache->heights;
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cache->heights = NULL;
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cache->cached_heights = 0;
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cache->last_cached_height = 0;
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cache->cached_base_height = FALSE;
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}
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if (sizes)
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{
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for (i = 0; i < GTK_SIZE_REQUEST_CACHED_SIZES && sizes[i] != NULL; i++)
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g_slice_free (SizeRequest, sizes[i]);
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g_slice_free1 (sizeof (SizeRequest *) * GTK_SIZE_REQUEST_CACHED_SIZES, sizes);
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}
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}
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void
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_gtk_widget_free_cached_sizes (GtkWidget *widget)
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{
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SizeRequestCache *cache;
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cache = _gtk_widget_peek_request_cache (widget);
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clear_cache (cache, GTK_SIZE_GROUP_HORIZONTAL);
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clear_cache (cache, GTK_SIZE_GROUP_VERTICAL);
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}
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/* This function checks if 'request_needed' flag is present
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* and resets the cache state if a request is needed for
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* a given orientation.
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*/
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static SizeRequestCache *
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init_cache (GtkWidget *widget)
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{
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SizeRequestCache *cache;
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cache = _gtk_widget_peek_request_cache (widget);
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if (_gtk_widget_get_width_request_needed (widget))
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clear_cache (cache, GTK_SIZE_GROUP_HORIZONTAL);
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if (_gtk_widget_get_height_request_needed (widget))
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clear_cache (cache, GTK_SIZE_GROUP_VERTICAL);
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return cache;
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}
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/* looks for a cached size request for this for_size. If not
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* found, returns the oldest entry so it can be overwritten
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*
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* Note that this caching code was originally derived from
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* the Clutter toolkit but has evolved for other GTK+ requirements.
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*/
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static gboolean
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get_cached_size (GtkWidget *widget,
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GtkSizeGroupMode orientation,
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gint for_size,
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CachedSize **result)
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{
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SizeRequestCache *cache;
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SizeRequest **cached_sizes;
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guint i, n_sizes;
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cache = init_cache (widget);
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if (for_size < 0)
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{
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if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
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{
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*result = &cache->cached_width;
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return cache->cached_base_width;
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}
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else
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{
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*result = &cache->cached_height;
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return cache->cached_base_height;
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}
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}
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if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
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{
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cached_sizes = cache->widths;
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n_sizes = cache->cached_widths;
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}
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else
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{
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cached_sizes = cache->heights;
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n_sizes = cache->cached_heights;
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}
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/* Search for an already cached size */
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for (i = 0; i < n_sizes; i++)
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{
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if (cached_sizes[i]->lower_for_size <= for_size &&
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cached_sizes[i]->upper_for_size >= for_size)
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{
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*result = &cached_sizes[i]->cached_size;
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return TRUE;
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}
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}
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return FALSE;
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}
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static void
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commit_cached_size (GtkWidget *widget,
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GtkSizeGroupMode orientation,
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gint for_size,
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gint minimum_size,
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gint natural_size)
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{
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SizeRequestCache *cache;
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SizeRequest **cached_sizes;
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guint i, n_sizes;
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cache = _gtk_widget_peek_request_cache (widget);
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/* First handle caching of the base requests */
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if (for_size < 0)
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{
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if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
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{
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cache->cached_width.minimum_size = minimum_size;
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cache->cached_width.natural_size = natural_size;
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cache->cached_base_width = TRUE;
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}
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else
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{
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cache->cached_height.minimum_size = minimum_size;
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cache->cached_height.natural_size = natural_size;
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cache->cached_base_height = TRUE;
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}
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return;
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}
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/* Check if the minimum_size and natural_size is already
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* in the cache and if this result can be used to extend
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* that cache entry
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*/
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if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
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{
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cached_sizes = cache->widths;
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n_sizes = cache->cached_widths;
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}
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else
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{
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cached_sizes = cache->heights;
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n_sizes = cache->cached_heights;
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}
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for (i = 0; i < n_sizes; i++)
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{
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if (cached_sizes[i]->cached_size.minimum_size == minimum_size &&
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cached_sizes[i]->cached_size.natural_size == natural_size)
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{
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cached_sizes[i]->lower_for_size = MIN (cached_sizes[i]->lower_for_size, for_size);
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cached_sizes[i]->upper_for_size = MAX (cached_sizes[i]->upper_for_size, for_size);
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return;
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}
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}
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/* If not found, pull a new size from the cache, the returned size cache
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* will immediately be used to cache the new computed size so we go ahead
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* and increment the last_cached_width/height right away */
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if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
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{
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if (cache->cached_widths < GTK_SIZE_REQUEST_CACHED_SIZES)
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{
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cache->cached_widths++;
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cache->last_cached_width = cache->cached_widths - 1;
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}
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else
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{
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if (++cache->last_cached_width == GTK_SIZE_REQUEST_CACHED_SIZES)
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cache->last_cached_width = 0;
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}
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if (!cache->widths)
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cache->widths = g_slice_alloc0 (sizeof (SizeRequest *) * GTK_SIZE_REQUEST_CACHED_SIZES);
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if (!cache->widths[cache->last_cached_width])
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cache->widths[cache->last_cached_width] = g_slice_new (SizeRequest);
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cache->widths[cache->last_cached_width]->lower_for_size = for_size;
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cache->widths[cache->last_cached_width]->upper_for_size = for_size;
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cache->widths[cache->last_cached_width]->cached_size.minimum_size = minimum_size;
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cache->widths[cache->last_cached_width]->cached_size.natural_size = natural_size;
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}
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else /* GTK_SIZE_GROUP_VERTICAL */
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{
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if (cache->cached_heights < GTK_SIZE_REQUEST_CACHED_SIZES)
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{
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cache->cached_heights++;
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cache->last_cached_height = cache->cached_heights - 1;
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}
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else
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{
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if (++cache->last_cached_height == GTK_SIZE_REQUEST_CACHED_SIZES)
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cache->last_cached_height = 0;
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}
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if (!cache->heights)
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cache->heights = g_slice_alloc0 (sizeof (SizeRequest *) * GTK_SIZE_REQUEST_CACHED_SIZES);
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if (!cache->heights[cache->last_cached_height])
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cache->heights[cache->last_cached_height] = g_slice_new (SizeRequest);
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cache->heights[cache->last_cached_height]->lower_for_size = for_size;
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cache->heights[cache->last_cached_height]->upper_for_size = for_size;
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cache->heights[cache->last_cached_height]->cached_size.minimum_size = minimum_size;
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cache->heights[cache->last_cached_height]->cached_size.natural_size = natural_size;
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}
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}
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/* This is the main function that checks for a cached size and
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* possibly queries the widget class to compute the size if it's
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* not cached. If the for_size here is -1, then get_preferred_width()
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* or get_preferred_height() will be used.
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*/
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static void
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compute_size_for_orientation (GtkWidget *widget,
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GtkSizeGroupMode orientation,
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gint for_size,
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gint *minimum_size,
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gint *natural_size)
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{
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CachedSize *cached_size;
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gboolean found_in_cache = FALSE;
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gint min_size = 0;
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gint nat_size = 0;
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found_in_cache = get_cached_size (widget, orientation, for_size, &cached_size);
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if (!found_in_cache)
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{
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gint adjusted_min, adjusted_natural, adjusted_for_size = for_size;
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gtk_widget_ensure_style (widget);
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if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
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{
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if (for_size < 0)
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{
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push_recursion_check (widget, orientation, for_size);
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GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget, &min_size, &nat_size);
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pop_recursion_check (widget, orientation);
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}
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else
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{
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gint ignored_position = 0;
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gint minimum_height;
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gint natural_height;
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/* Pull the base natural height from the cache as it's needed to adjust
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* the proposed 'for_size' */
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gtk_widget_get_preferred_height (widget, &minimum_height, &natural_height);
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/* convert for_size to unadjusted height (for_size is a proposed allocation) */
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GTK_WIDGET_GET_CLASS (widget)->adjust_size_allocation (widget,
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GTK_ORIENTATION_VERTICAL,
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&minimum_height,
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&natural_height,
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&ignored_position,
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&adjusted_for_size);
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push_recursion_check (widget, orientation, for_size);
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GTK_WIDGET_GET_CLASS (widget)->get_preferred_width_for_height (widget,
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MAX (adjusted_for_size, minimum_height),
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&min_size, &nat_size);
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pop_recursion_check (widget, orientation);
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}
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}
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else
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{
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if (for_size < 0)
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{
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push_recursion_check (widget, orientation, for_size);
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GTK_WIDGET_GET_CLASS (widget)->get_preferred_height (widget, &min_size, &nat_size);
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pop_recursion_check (widget, orientation);
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}
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else
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{
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gint ignored_position = 0;
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gint minimum_width;
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gint natural_width;
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/* Pull the base natural width from the cache as it's needed to adjust
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* the proposed 'for_size' */
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gtk_widget_get_preferred_width (widget, &minimum_width, &natural_width);
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/* convert for_size to unadjusted width (for_size is a proposed allocation) */
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GTK_WIDGET_GET_CLASS (widget)->adjust_size_allocation (widget,
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GTK_ORIENTATION_HORIZONTAL,
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&minimum_width,
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&natural_width,
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&ignored_position,
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&adjusted_for_size);
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push_recursion_check (widget, orientation, for_size);
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GTK_WIDGET_GET_CLASS (widget)->get_preferred_height_for_width (widget,
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MAX (adjusted_for_size, minimum_width),
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&min_size, &nat_size);
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pop_recursion_check (widget, orientation);
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}
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}
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if (min_size > nat_size)
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{
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g_warning ("%s %p reported min size %d and natural size %d; natural size must be >= min size",
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G_OBJECT_TYPE_NAME (widget), widget, min_size, nat_size);
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}
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if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
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_gtk_widget_set_width_request_needed (widget, FALSE);
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else
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_gtk_widget_set_height_request_needed (widget, FALSE);
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adjusted_min = min_size;
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adjusted_natural = nat_size;
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GTK_WIDGET_GET_CLASS (widget)->adjust_size_request (widget,
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orientation == GTK_SIZE_GROUP_HORIZONTAL ?
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GTK_ORIENTATION_HORIZONTAL :
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GTK_ORIENTATION_VERTICAL,
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&adjusted_min,
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&adjusted_natural);
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if (adjusted_min < min_size ||
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adjusted_natural < nat_size)
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{
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g_warning ("%s %p adjusted size %s min %d natural %d must not decrease below min %d natural %d",
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G_OBJECT_TYPE_NAME (widget), widget,
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orientation == GTK_SIZE_GROUP_VERTICAL ? "vertical" : "horizontal",
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adjusted_min, adjusted_natural,
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min_size, nat_size);
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/* don't use the adjustment */
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}
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else if (adjusted_min > adjusted_natural)
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{
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g_warning ("%s %p adjusted size %s min %d natural %d original min %d natural %d has min greater than natural",
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G_OBJECT_TYPE_NAME (widget), widget,
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orientation == GTK_SIZE_GROUP_VERTICAL ? "vertical" : "horizontal",
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adjusted_min, adjusted_natural,
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min_size, nat_size);
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/* don't use the adjustment */
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}
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else
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{
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/* adjustment looks good */
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min_size = adjusted_min;
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nat_size = adjusted_natural;
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}
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/* Update size-groups with our request and update our cached requests
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* with the size-group values in a single pass.
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*/
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_gtk_size_group_bump_requisition (widget,
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orientation,
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&min_size,
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&nat_size);
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commit_cached_size (widget, orientation, for_size, min_size, nat_size);
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}
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else
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{
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min_size = cached_size->minimum_size;
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nat_size = cached_size->natural_size;
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}
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if (minimum_size)
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*minimum_size = min_size;
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if (natural_size)
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*natural_size = nat_size;
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g_assert (min_size <= nat_size);
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GTK_NOTE (SIZE_REQUEST,
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g_print ("[%p] %s\t%s: %d is minimum %d and natural: %d (hit cache: %s)\n",
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widget, G_OBJECT_TYPE_NAME (widget),
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orientation == GTK_SIZE_GROUP_HORIZONTAL ?
|
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"width for height" : "height for width" ,
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for_size, min_size, nat_size,
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found_in_cache ? "yes" : "no"));
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}
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/**
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* gtk_widget_get_request_mode:
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* @widget: a #GtkWidget instance
|
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*
|
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* Gets whether the widget prefers a height-for-width layout
|
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* or a width-for-height layout.
|
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*
|
|
* <note><para>#GtkBin widgets generally propagate the preference of
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* their child, container widgets need to request something either in
|
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* context of their children or in context of their allocation
|
|
* capabilities.</para></note>
|
|
*
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|
* Returns: The #GtkSizeRequestMode preferred by @widget.
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*
|
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* Since: 3.0
|
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*/
|
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GtkSizeRequestMode
|
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gtk_widget_get_request_mode (GtkWidget *widget)
|
|
{
|
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g_return_val_if_fail (GTK_IS_WIDGET (widget), GTK_SIZE_REQUEST_CONSTANT_SIZE);
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|
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return GTK_WIDGET_GET_CLASS (widget)->get_request_mode (widget);
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|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
g_return_if_fail (GTK_IS_WIDGET (widget));
|
|
g_return_if_fail (minimum_width != NULL || natural_width != NULL);
|
|
|
|
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)
|
|
{
|
|
g_return_if_fail (GTK_IS_WIDGET (widget));
|
|
g_return_if_fail (minimum_height != NULL || natural_height != NULL);
|
|
|
|
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)
|
|
{
|
|
g_return_if_fail (GTK_IS_WIDGET (widget));
|
|
g_return_if_fail (minimum_width != NULL || natural_width != NULL);
|
|
g_return_if_fail (height >= 0);
|
|
|
|
if (GTK_WIDGET_GET_CLASS (widget)->get_request_mode (widget) == GTK_SIZE_REQUEST_CONSTANT_SIZE)
|
|
compute_size_for_orientation (widget, GTK_SIZE_GROUP_HORIZONTAL,
|
|
-1, minimum_width, natural_width);
|
|
else
|
|
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)
|
|
{
|
|
g_return_if_fail (GTK_IS_WIDGET (widget));
|
|
g_return_if_fail (minimum_height != NULL || natural_height != NULL);
|
|
g_return_if_fail (width >= 0);
|
|
|
|
if (GTK_WIDGET_GET_CLASS (widget)->get_request_mode (widget) == GTK_SIZE_REQUEST_CONSTANT_SIZE)
|
|
compute_size_for_orientation (widget, GTK_SIZE_GROUP_VERTICAL,
|
|
-1, minimum_height, natural_height);
|
|
else
|
|
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 or CONSTANT_SIZE */
|
|
{
|
|
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;
|
|
}
|