forked from AuroraMiddleware/gtk
230 lines
6.8 KiB
C
230 lines
6.8 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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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 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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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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/**
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* SECTION:gtkbin
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* @Short_description: A container with just one child
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* @Title: GtkBin
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*
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* The #GtkBin widget is a container with just one child.
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* It is not very useful itself, but it is useful for deriving subclasses,
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* since it provides common code needed for handling a single child widget.
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*
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* Many GTK+ widgets are subclasses of #GtkBin, including #GtkWindow,
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* #GtkButton, #GtkFrame or #GtkScrolledWindow.
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*/
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#include "config.h"
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#include "gtkbin.h"
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#include "gtksizerequest.h"
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#include "gtkintl.h"
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struct _GtkBinPrivate
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{
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GtkWidget *child;
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};
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static void gtk_bin_add (GtkContainer *container,
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GtkWidget *widget);
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static void gtk_bin_remove (GtkContainer *container,
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GtkWidget *widget);
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static void gtk_bin_forall (GtkContainer *container,
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GtkCallback callback,
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gpointer callback_data);
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static GType gtk_bin_child_type (GtkContainer *container);
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static void gtk_bin_measure (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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static void gtk_bin_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation);
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G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GtkBin, gtk_bin, GTK_TYPE_CONTAINER)
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static void
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gtk_bin_class_init (GtkBinClass *class)
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{
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GtkWidgetClass *widget_class = (GtkWidgetClass*) class;
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GtkContainerClass *container_class = (GtkContainerClass*) class;
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widget_class->measure = gtk_bin_measure;
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widget_class->size_allocate = gtk_bin_size_allocate;
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container_class->add = gtk_bin_add;
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container_class->remove = gtk_bin_remove;
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container_class->forall = gtk_bin_forall;
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container_class->child_type = gtk_bin_child_type;
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}
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static void
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gtk_bin_init (GtkBin *bin)
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{
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bin->priv = gtk_bin_get_instance_private (bin);
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gtk_widget_set_has_window (GTK_WIDGET (bin), FALSE);
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}
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static GType
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gtk_bin_child_type (GtkContainer *container)
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{
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GtkBinPrivate *priv = GTK_BIN (container)->priv;
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if (!priv->child)
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return GTK_TYPE_WIDGET;
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else
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return G_TYPE_NONE;
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}
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static void
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gtk_bin_add (GtkContainer *container,
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GtkWidget *child)
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{
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GtkBin *bin = GTK_BIN (container);
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GtkBinPrivate *priv = bin->priv;
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if (priv->child != NULL)
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{
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g_warning ("Attempting to add a widget with type %s to a %s, "
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"but as a GtkBin subclass a %s can only contain one widget at a time; "
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"it already contains a widget of type %s",
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g_type_name (G_OBJECT_TYPE (child)),
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g_type_name (G_OBJECT_TYPE (bin)),
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g_type_name (G_OBJECT_TYPE (bin)),
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g_type_name (G_OBJECT_TYPE (priv->child)));
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return;
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}
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gtk_widget_set_parent (child, GTK_WIDGET (bin));
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priv->child = child;
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}
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static void
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gtk_bin_remove (GtkContainer *container,
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GtkWidget *child)
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{
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GtkBin *bin = GTK_BIN (container);
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GtkBinPrivate *priv = bin->priv;
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gboolean widget_was_visible;
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g_return_if_fail (priv->child == child);
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widget_was_visible = gtk_widget_get_visible (child);
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gtk_widget_unparent (child);
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priv->child = NULL;
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/* queue resize regardless of gtk_widget_get_visible (container),
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* since that's what is needed by toplevels, which derive from GtkBin.
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*/
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if (widget_was_visible)
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gtk_widget_queue_resize (GTK_WIDGET (container));
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}
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static void
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gtk_bin_forall (GtkContainer *container,
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GtkCallback callback,
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gpointer callback_data)
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{
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GtkBin *bin = GTK_BIN (container);
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GtkBinPrivate *priv = bin->priv;
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if (priv->child)
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(* callback) (priv->child, callback_data);
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}
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static void
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gtk_bin_measure (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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GtkBinPrivate *priv = gtk_bin_get_instance_private (GTK_BIN (widget));
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if (priv->child != NULL && gtk_widget_get_visible (priv->child))
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{
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gtk_widget_measure (priv->child,
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orientation,
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for_size,
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minimum, natural,
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minimum_baseline, natural_baseline);
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}
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else
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{
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*minimum = 0;
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*natural = 0;
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}
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}
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static void
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gtk_bin_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation)
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{
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GtkBin *bin = GTK_BIN (widget);
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GtkBinPrivate *priv = bin->priv;
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if (priv->child && gtk_widget_get_visible (priv->child))
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{
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GtkAllocation clip = *allocation;
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gtk_widget_size_allocate (priv->child, allocation);
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gtk_widget_get_clip (priv->child, &clip);
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gtk_widget_set_clip (widget, &clip);
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}
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}
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/**
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* gtk_bin_get_child:
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* @bin: a #GtkBin
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*
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* Gets the child of the #GtkBin, or %NULL if the bin contains
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* no child widget. The returned widget does not have a reference
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* added, so you do not need to unref it.
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*
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* Returns: (transfer none): pointer to child of the #GtkBin
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**/
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GtkWidget*
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gtk_bin_get_child (GtkBin *bin)
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{
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g_return_val_if_fail (GTK_IS_BIN (bin), NULL);
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return bin->priv->child;
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}
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void
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_gtk_bin_set_child (GtkBin *bin,
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GtkWidget *widget)
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{
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bin->priv->child = widget;
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}
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