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/* gtkbinlayout.c: Layout manager for bin-like widgets
* Copyright 2019 GNOME Foundation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* SECTION:gtkbinlayout
* @Title: GtkBinLayout
* @Short_description: A layout manager for bin-like widgets
* @Include: gtk/gtk.h
*
* GtkBinLayout is a #GtkLayoutManager subclass useful for create "bins" of
* widgets. GtkBinLayout will stack each child of a widget on top of each
* other, using the #GtkWidget:hexpand, #GtkWidget:vexpand, #GtkWidget:halign,
* and #GtkWidget:valign properties of each child to determine where they
* should be positioned.
*/
#include "config.h"
#include "gtkbinlayout.h"
#include "gtkwidgetprivate.h"
struct _GtkBinLayout
{
GtkLayoutManager parent_instance;
};
G_DEFINE_TYPE (GtkBinLayout, gtk_bin_layout, GTK_TYPE_LAYOUT_MANAGER)
static void
gtk_bin_layout_measure (GtkLayoutManager *layout_manager,
GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkWidget *child;
for (child = _gtk_widget_get_first_child (widget);
child != NULL;
child = _gtk_widget_get_next_sibling (child))
{
if (gtk_widget_should_layout (child))
{
int child_min = 0;
int child_nat = 0;
int child_min_baseline = -1;
int child_nat_baseline = -1;
gtk_widget_measure (child, orientation, for_size,
&child_min, &child_nat,
&child_min_baseline, &child_nat_baseline);
*minimum = MAX (*minimum, child_min);
*natural = MAX (*natural, child_nat);
if (child_min_baseline > -1)
*minimum_baseline = MAX (*minimum_baseline, child_min_baseline);
if (child_nat_baseline > -1)
*natural_baseline = MAX (*natural_baseline, child_nat_baseline);
}
}
}
static void
gtk_bin_layout_allocate (GtkLayoutManager *layout_manager,
GtkWidget *widget,
int width,
int height,
int baseline)
{
GtkWidget *child;
for (child = _gtk_widget_get_first_child (widget);
child != NULL;
child = _gtk_widget_get_next_sibling (child))
{
if (child && gtk_widget_should_layout (child))
gtk_widget_allocate (child, width, height, baseline, NULL);
}
}
static void
gtk_bin_layout_class_init (GtkBinLayoutClass *klass)
{
GtkLayoutManagerClass *layout_manager_class = GTK_LAYOUT_MANAGER_CLASS (klass);
layout_manager_class->measure = gtk_bin_layout_measure;
layout_manager_class->allocate = gtk_bin_layout_allocate;
}
static void
gtk_bin_layout_init (GtkBinLayout *self)
{
}
/**
* gtk_bin_layout_new:
*
* Creates a new #GtkBinLayout instance.
*
* Returns: the newly created #GtkBinLayout
*/
GtkLayoutManager *
gtk_bin_layout_new (void)
{
return g_object_new (GTK_TYPE_BIN_LAYOUT, NULL);
}
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