forked from AuroraMiddleware/gtk
124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
/* gtkbinlayout.c: Layout manager for bin-like widgets
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* Copyright 2019 GNOME Foundation
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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 Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser 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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/**
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* GtkBinLayout:
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*
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* `GtkBinLayout` is a `GtkLayoutManager` subclass useful for create "bins" of
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* widgets.
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*
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* `GtkBinLayout` will stack each child of a widget on top of each other,
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* using the [property@Gtk.Widget:hexpand], [property@Gtk.Widget:vexpand],
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* [property@Gtk.Widget:halign], and [property@Gtk.Widget:valign] properties
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* of each child to determine where they should be positioned.
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*/
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#include "config.h"
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#include "gtkbinlayout.h"
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#include "gtkwidgetprivate.h"
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struct _GtkBinLayout
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{
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GtkLayoutManager parent_instance;
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};
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G_DEFINE_TYPE (GtkBinLayout, gtk_bin_layout, GTK_TYPE_LAYOUT_MANAGER)
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static void
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gtk_bin_layout_measure (GtkLayoutManager *layout_manager,
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GtkWidget *widget,
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GtkOrientation orientation,
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int for_size,
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int *minimum,
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int *natural,
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int *minimum_baseline,
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int *natural_baseline)
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{
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GtkWidget *child;
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for (child = _gtk_widget_get_first_child (widget);
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child != NULL;
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child = _gtk_widget_get_next_sibling (child))
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{
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if (gtk_widget_should_layout (child))
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{
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int child_min = 0;
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int child_nat = 0;
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int child_min_baseline = -1;
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int child_nat_baseline = -1;
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gtk_widget_measure (child, orientation, for_size,
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&child_min, &child_nat,
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&child_min_baseline, &child_nat_baseline);
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*minimum = MAX (*minimum, child_min);
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*natural = MAX (*natural, child_nat);
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if (child_min_baseline > -1)
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*minimum_baseline = MAX (*minimum_baseline, child_min_baseline);
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if (child_nat_baseline > -1)
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*natural_baseline = MAX (*natural_baseline, child_nat_baseline);
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}
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}
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}
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static void
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gtk_bin_layout_allocate (GtkLayoutManager *layout_manager,
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GtkWidget *widget,
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int width,
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int height,
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int baseline)
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{
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GtkWidget *child;
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for (child = _gtk_widget_get_first_child (widget);
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child != NULL;
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child = _gtk_widget_get_next_sibling (child))
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{
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if (child && gtk_widget_should_layout (child))
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gtk_widget_allocate (child, width, height, baseline, NULL);
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}
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}
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static void
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gtk_bin_layout_class_init (GtkBinLayoutClass *klass)
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{
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GtkLayoutManagerClass *layout_manager_class = GTK_LAYOUT_MANAGER_CLASS (klass);
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layout_manager_class->measure = gtk_bin_layout_measure;
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layout_manager_class->allocate = gtk_bin_layout_allocate;
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}
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static void
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gtk_bin_layout_init (GtkBinLayout *self)
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{
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}
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/**
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* gtk_bin_layout_new:
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*
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* Creates a new `GtkBinLayout` instance.
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*
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* Returns: the newly created `GtkBinLayout`
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*/
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GtkLayoutManager *
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gtk_bin_layout_new (void)
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{
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return g_object_new (GTK_TYPE_BIN_LAYOUT, NULL);
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}
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