forked from AuroraMiddleware/gtk
871 lines
31 KiB
C
871 lines
31 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, see <http://www.gnu.org/licenses/>.
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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 "gtksizerequestcacheprivate.h"
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#include "gtkwidgetprivate.h"
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#ifdef G_ENABLE_CONSISTENCY_CHECKS
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static GQuark recursion_check_quark = 0;
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static void
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push_recursion_check (GtkWidget *widget,
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GtkOrientation orientation,
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gint for_size)
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{
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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_ORIENTATION_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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}
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static void
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pop_recursion_check (GtkWidget *widget,
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GtkOrientation orientation)
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{
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g_object_set_qdata (G_OBJECT (widget), recursion_check_quark, NULL);
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}
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#else
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#define push_recursion_check(widget, orientation, for_size)
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#define pop_recursion_check(widget, orientation)
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#endif /* G_ENABLE_CONSISTENCY_CHECKS */
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static const char *
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get_vfunc_name (GtkOrientation orientation,
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gint for_size)
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{
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if (orientation == GTK_ORIENTATION_HORIZONTAL)
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return for_size < 0 ? "get_preferred_width" : "get_preferred_width_for_height";
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else
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return for_size < 0 ? "get_preferred_height" : "get_preferred_height_for_width";
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}
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static void
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gtk_widget_query_size_for_orientation (GtkWidget *widget,
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GtkOrientation 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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gint *minimum_baseline,
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gint *natural_baseline)
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{
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SizeRequestCache *cache;
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GtkWidgetClass *widget_class;
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gint min_size = 0;
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gint nat_size = 0;
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gint min_baseline = -1;
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gint nat_baseline = -1;
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gboolean found_in_cache;
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gtk_widget_ensure_resize (widget);
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if (gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_CONSTANT_SIZE)
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for_size = -1;
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cache = _gtk_widget_peek_request_cache (widget);
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found_in_cache = _gtk_size_request_cache_lookup (cache,
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orientation,
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for_size,
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&min_size,
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&nat_size,
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&min_baseline,
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&nat_baseline);
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widget_class = GTK_WIDGET_GET_CLASS (widget);
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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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if (orientation == GTK_ORIENTATION_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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widget_class->measure (widget, GTK_ORIENTATION_HORIZONTAL, -1,
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&min_size, &nat_size, NULL, NULL);
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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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widget_class->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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widget_class->measure (widget,
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GTK_ORIENTATION_HORIZONTAL,
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MAX (adjusted_for_size, minimum_height),
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&min_size, &nat_size,
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NULL, NULL);
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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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widget_class->measure (widget,
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GTK_ORIENTATION_VERTICAL,
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-1,
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&min_size, &nat_size,
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&min_baseline, &nat_baseline);
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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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widget_class->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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widget_class->measure (widget,
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GTK_ORIENTATION_VERTICAL,
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MAX (adjusted_for_size, minimum_width),
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&min_size, &nat_size,
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&min_baseline, &nat_baseline);
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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 in %s(); natural size must be >= min size",
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G_OBJECT_TYPE_NAME (widget), widget, min_size, nat_size, get_vfunc_name (orientation, for_size));
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}
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adjusted_min = min_size;
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adjusted_natural = nat_size;
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widget_class->adjust_size_request (widget,
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orientation,
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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_ORIENTATION_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_ORIENTATION_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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if (min_baseline != -1 || nat_baseline != -1)
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{
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if (orientation == GTK_ORIENTATION_HORIZONTAL)
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{
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g_warning ("%s %p reported a horizontal baseline",
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G_OBJECT_TYPE_NAME (widget), widget);
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min_baseline = -1;
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nat_baseline = -1;
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}
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else if (min_baseline == -1 || nat_baseline == -1)
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{
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g_warning ("%s %p reported baseline for only one of min/natural (min: %d, natural: %d)",
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G_OBJECT_TYPE_NAME (widget), widget,
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min_baseline, nat_baseline);
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min_baseline = -1;
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nat_baseline = -1;
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}
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else if (gtk_widget_get_valign_with_baseline (widget) != GTK_ALIGN_BASELINE)
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{
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/* Ignore requested baseline for non-aligned widgets */
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min_baseline = -1;
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nat_baseline = -1;
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}
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else
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widget_class->adjust_baseline_request (widget,
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&min_baseline,
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&nat_baseline);
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}
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_gtk_size_request_cache_commit (cache,
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orientation,
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for_size,
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min_size,
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nat_size,
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min_baseline,
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nat_baseline);
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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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if (minimum_baseline)
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*minimum_baseline = min_baseline;
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if (natural_baseline)
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*natural_baseline = nat_baseline;
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g_assert (min_size <= nat_size);
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GTK_NOTE (SIZE_REQUEST, {
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GString *s;
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s = g_string_new ("");
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g_string_append_printf (s, "[%p] %s\t%s: %d is minimum %d and natural: %d",
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widget, G_OBJECT_TYPE_NAME (widget),
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orientation == GTK_ORIENTATION_HORIZONTAL
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? "width for height"
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: "height for width",
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for_size, min_size, nat_size);
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if (min_baseline != -1 || nat_baseline != -1)
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{
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g_string_append_printf (s, ", baseline %d/%d",
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min_baseline, nat_baseline);
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}
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g_string_append_printf (s, " (hit cache: %s)\n",
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found_in_cache ? "yes" : "no");
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g_message ("%s", s->str);
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g_string_free (s, TRUE);
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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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gtk_widget_compute_size_for_orientation (GtkWidget *widget,
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GtkOrientation orientation,
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gint for_size,
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gint *minimum,
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gint *natural,
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gint *minimum_baseline,
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gint *natural_baseline)
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{
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GHashTable *widgets;
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GHashTableIter iter;
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gpointer key;
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gint min_result = 0, nat_result = 0;
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if (!_gtk_widget_get_visible (widget) && !_gtk_widget_is_toplevel (widget))
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{
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if (minimum)
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*minimum = 0;
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if (natural)
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*natural = 0;
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if (minimum_baseline)
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*minimum_baseline = -1;
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if (natural_baseline)
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*natural_baseline = -1;
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return;
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}
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if (G_LIKELY (!_gtk_widget_get_sizegroups (widget)))
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{
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gtk_widget_query_size_for_orientation (widget, orientation, for_size, minimum, natural,
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minimum_baseline, natural_baseline);
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return;
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}
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widgets = _gtk_size_group_get_widget_peers (widget, orientation);
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g_hash_table_iter_init (&iter, widgets);
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while (g_hash_table_iter_next (&iter, &key, NULL))
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{
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GtkWidget *tmp_widget = key;
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gint min_dimension, nat_dimension;
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gtk_widget_query_size_for_orientation (tmp_widget, orientation, for_size, &min_dimension, &nat_dimension, NULL, NULL);
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min_result = MAX (min_result, min_dimension);
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nat_result = MAX (nat_result, nat_dimension);
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}
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g_hash_table_destroy (widgets);
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/* Baselines make no sense with sizegroups really */
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if (minimum_baseline)
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*minimum_baseline = -1;
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if (natural_baseline)
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*natural_baseline = -1;
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if (minimum)
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*minimum = min_result;
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if (natural)
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*natural = nat_result;
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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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*
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* #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
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* capabilities.
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*
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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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{
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SizeRequestCache *cache;
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cache = _gtk_widget_peek_request_cache (widget);
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if (G_UNLIKELY (!cache->request_mode_valid))
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{
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cache->request_mode = GTK_WIDGET_GET_CLASS (widget)->get_request_mode (widget);
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cache->request_mode_valid = TRUE;
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}
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return cache->request_mode;
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}
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/**
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* gtk_widget_get_preferred_width:
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* @widget: a #GtkWidget instance
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* @minimum_width: (out) (allow-none): location to store the minimum width, or %NULL
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* @natural_width: (out) (allow-none): location to store the natural width, or %NULL
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*
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* Retrieves a widget’s initial minimum and natural width.
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*
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* This call is specific to height-for-width requests.
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*
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* The returned request will be modified by the
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* GtkWidgetClass::adjust_size_request virtual method and by any
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* #GtkSizeGroups that have been applied. That is, the returned request
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* is the one that should be used for layout, not necessarily the one
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* returned by the widget itself.
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*
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* Since: 3.0
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*/
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void
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gtk_widget_get_preferred_width (GtkWidget *widget,
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gint *minimum_width,
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gint *natural_width)
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{
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g_return_if_fail (GTK_IS_WIDGET (widget));
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g_return_if_fail (minimum_width != NULL || natural_width != NULL);
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gtk_widget_compute_size_for_orientation (widget,
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GTK_ORIENTATION_HORIZONTAL,
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-1,
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minimum_width,
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natural_width,
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NULL, NULL);
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}
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/**
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* gtk_widget_get_preferred_height:
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* @widget: a #GtkWidget instance
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* @minimum_height: (out) (allow-none): location to store the minimum height, or %NULL
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* @natural_height: (out) (allow-none): location to store the natural height, or %NULL
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*
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* Retrieves a widget’s initial minimum and natural height.
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*
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* This call is specific to width-for-height requests.
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*
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* The returned request will be modified by the
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* GtkWidgetClass::adjust_size_request virtual method and by any
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* #GtkSizeGroups that have been applied. That is, the returned request
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* is the one that should be used for layout, not necessarily the one
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* returned by the widget itself.
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*
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* Since: 3.0
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*/
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void
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gtk_widget_get_preferred_height (GtkWidget *widget,
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gint *minimum_height,
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gint *natural_height)
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{
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g_return_if_fail (GTK_IS_WIDGET (widget));
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g_return_if_fail (minimum_height != NULL || natural_height != NULL);
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gtk_widget_compute_size_for_orientation (widget,
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GTK_ORIENTATION_VERTICAL,
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-1,
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minimum_height,
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natural_height,
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NULL, NULL);
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}
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/**
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* gtk_widget_get_preferred_width_for_height:
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* @widget: a #GtkWidget instance
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* @height: the height which is available for allocation
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* @minimum_width: (out) (allow-none): location for storing the minimum width, or %NULL
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* @natural_width: (out) (allow-none): location for storing the natural width, or %NULL
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*
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* Retrieves a widget’s minimum and natural width if it would be given
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* the specified @height.
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*
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* The returned request will be modified by the
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* GtkWidgetClass::adjust_size_request virtual method and by any
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* #GtkSizeGroups that have been applied. That is, the returned request
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* is the one that should be used for layout, not necessarily the one
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* returned by the widget itself.
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*
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* Since: 3.0
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*/
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void
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gtk_widget_get_preferred_width_for_height (GtkWidget *widget,
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gint height,
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gint *minimum_width,
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gint *natural_width)
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{
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g_return_if_fail (GTK_IS_WIDGET (widget));
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g_return_if_fail (minimum_width != NULL || natural_width != NULL);
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g_return_if_fail (height >= 0);
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gtk_widget_compute_size_for_orientation (widget,
|
||
GTK_ORIENTATION_HORIZONTAL,
|
||
height,
|
||
minimum_width,
|
||
natural_width,
|
||
NULL, NULL);
|
||
}
|
||
|
||
/**
|
||
* 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
|
||
* #GtkSizeGroups 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);
|
||
|
||
gtk_widget_compute_size_for_orientation (widget,
|
||
GTK_ORIENTATION_VERTICAL,
|
||
width,
|
||
minimum_height,
|
||
natural_height,
|
||
NULL, NULL);
|
||
}
|
||
|
||
/**
|
||
* gtk_widget_get_preferred_height_and_baseline_for_width:
|
||
* @widget: a #GtkWidget instance
|
||
* @width: the width which is available for allocation, or -1 if none
|
||
* @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
|
||
* @minimum_baseline: (out) (allow-none): location for storing the baseline for the minimum height, or %NULL
|
||
* @natural_baseline: (out) (allow-none): location for storing the baseline for the natural height, or %NULL
|
||
*
|
||
* Retrieves a widget’s minimum and natural height and the corresponding baselines if it would be given
|
||
* the specified @width, or the default height if @width is -1. The baselines may be -1 which means
|
||
* that no baseline is requested for this widget.
|
||
*
|
||
* The returned request will be modified by the
|
||
* GtkWidgetClass::adjust_size_request and GtkWidgetClass::adjust_baseline_request virtual methods
|
||
* and by any #GtkSizeGroups 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: 3.10
|
||
*/
|
||
void
|
||
gtk_widget_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
|
||
gint width,
|
||
gint *minimum_height,
|
||
gint *natural_height,
|
||
gint *minimum_baseline,
|
||
gint *natural_baseline)
|
||
{
|
||
g_return_if_fail (GTK_IS_WIDGET (widget));
|
||
g_return_if_fail (minimum_height != NULL || natural_height != NULL);
|
||
g_return_if_fail (width >= -1);
|
||
|
||
gtk_widget_compute_size_for_orientation (widget,
|
||
GTK_ORIENTATION_VERTICAL,
|
||
width,
|
||
minimum_height,
|
||
natural_height,
|
||
minimum_baseline,
|
||
natural_baseline);
|
||
}
|
||
|
||
/*
|
||
* _gtk_widget_get_preferred_size_and_baseline:
|
||
* @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 and the corresponding baselines of a widget, taking
|
||
* into account the widget’s preference for height-for-width management. The baselines may
|
||
* be -1 which means that no baseline is requested for this widget.
|
||
*
|
||
* 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.
|
||
*
|
||
* 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.
|
||
*/
|
||
void
|
||
_gtk_widget_get_preferred_size_and_baseline (GtkWidget *widget,
|
||
GtkRequisition *minimum_size,
|
||
GtkRequisition *natural_size,
|
||
gint *minimum_baseline,
|
||
gint *natural_baseline)
|
||
{
|
||
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_and_baseline_for_width (widget, min_width,
|
||
&minimum_size->height, NULL, minimum_baseline, NULL);
|
||
}
|
||
|
||
if (natural_size)
|
||
{
|
||
natural_size->width = nat_width;
|
||
gtk_widget_get_preferred_height_and_baseline_for_width (widget, nat_width,
|
||
NULL, &natural_size->height, NULL, natural_baseline);
|
||
}
|
||
}
|
||
else /* GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT or CONSTANT_SIZE */
|
||
{
|
||
gtk_widget_get_preferred_height_and_baseline_for_width (widget, -1, &min_height, &nat_height, minimum_baseline, natural_baseline);
|
||
|
||
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);
|
||
}
|
||
}
|
||
}
|
||
|
||
/**
|
||
* 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.
|
||
*
|
||
* 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.
|
||
*
|
||
* Use gtk_widget_get_preferred_height_and_baseline_for_width() if you want to support
|
||
* baseline alignment.
|
||
*
|
||
* Since: 3.0
|
||
*/
|
||
void
|
||
gtk_widget_get_preferred_size (GtkWidget *widget,
|
||
GtkRequisition *minimum_size,
|
||
GtkRequisition *natural_size)
|
||
{
|
||
_gtk_widget_get_preferred_size_and_baseline (widget, minimum_size, natural_size,
|
||
NULL, NULL);
|
||
}
|
||
|
||
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;
|
||
}
|
||
|
||
/**
|
||
* gtk_widget_measure:
|
||
* @widget: A #GtkWidget instance
|
||
* @orientation: the orientation to measure
|
||
* @for_size: Size for the opposite of @orientation, i.e.
|
||
* if @orientation is %GTK_ORIENTATION_HORIZONTAL, this is
|
||
* the height the widget should be measured with. The %GTK_ORIENTATION_VERTICAL
|
||
* case is analogous. This way, both height-for-width and width-for-height
|
||
* requests can be implemented. If no size is known, -1 can be passed.
|
||
* @minimum: (out) (optional): location to store the minimum size, or %NULL
|
||
* @natural: (out) (optional): location to store the natural size, or %NULL
|
||
* @minimum_baseline: (out) (optional): location to store the baseline
|
||
* position for the minimum size, or %NULL
|
||
* @natural_baseline: (out) (optional): location to store the baseline
|
||
* position for the natural size, or %NULL
|
||
*
|
||
* Measures @widget in the orientation @orientation and for the given @for_size.
|
||
* As an example, if @orientation is GTK_ORIENTATION_HORIZONTAL and @for_size is 300,
|
||
* this functions will compute the minimum and natural width of @widget if
|
||
* it is allocated at a height of 300 pixels.
|
||
*
|
||
* Since: 3.90
|
||
*/
|
||
void
|
||
gtk_widget_measure (GtkWidget *widget,
|
||
GtkOrientation orientation,
|
||
int for_size,
|
||
int *minimum,
|
||
int *natural,
|
||
int *minimum_baseline,
|
||
int *natural_baseline)
|
||
{
|
||
g_return_if_fail (GTK_IS_WIDGET (widget));
|
||
g_return_if_fail (for_size >= -1);
|
||
g_return_if_fail (orientation == GTK_ORIENTATION_HORIZONTAL ||
|
||
orientation == GTK_ORIENTATION_VERTICAL);
|
||
|
||
if (orientation == GTK_ORIENTATION_HORIZONTAL)
|
||
{
|
||
if (for_size < 0)
|
||
gtk_widget_get_preferred_width (widget, minimum, natural);
|
||
else
|
||
gtk_widget_get_preferred_width_for_height (widget, for_size, minimum, natural);
|
||
|
||
if (minimum_baseline)
|
||
*minimum_baseline = -1;
|
||
if (natural_baseline)
|
||
*natural_baseline = -1;
|
||
}
|
||
else
|
||
{
|
||
gtk_widget_get_preferred_height_and_baseline_for_width (widget,
|
||
for_size,
|
||
minimum,
|
||
natural,
|
||
minimum_baseline,
|
||
natural_baseline);
|
||
}
|
||
}
|
||
|