forked from AuroraMiddleware/gtk
3563d11fc6
Implement get_preferred_width, get_preferred_height, and size_allocate. This allows GtkBin subclasses to be quick and easy, without the author doing the subclassing to have to do much work.
351 lines
12 KiB
C
351 lines
12 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, #GtkHandleBox 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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gboolean include_internals,
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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_get_preferred_width (GtkWidget *widget,
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gint *minimum_width,
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gint *natural_width);
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static void gtk_bin_get_preferred_height (GtkWidget *widget,
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gint *minimum_height,
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gint *natural_height);
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static void gtk_bin_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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static void gtk_bin_get_preferred_height_for_width (GtkWidget *widget,
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gint width,
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gint *minimum_height,
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gint *natural_height);
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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 (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->get_preferred_width = gtk_bin_get_preferred_width;
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widget_class->get_preferred_height = gtk_bin_get_preferred_height;
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widget_class->get_preferred_width_for_height = gtk_bin_get_preferred_width_for_height;
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widget_class->get_preferred_height_for_width = gtk_bin_get_preferred_height_for_width;
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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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g_type_class_add_private (class, sizeof (GtkBinPrivate));
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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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GtkBinPrivate *priv;
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bin->priv = G_TYPE_INSTANCE_GET_PRIVATE (bin,
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GTK_TYPE_BIN,
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GtkBinPrivate);
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priv = bin->priv;
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gtk_widget_set_has_window (GTK_WIDGET (bin), FALSE);
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priv->child = NULL;
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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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gboolean include_internals,
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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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/* GtkBin widgets define the padding and borders independantly so
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* we cannot provide a generic get_size() for the same reason
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* we never implemented size_request() here.
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*
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* But for cases where the GtkBin class's padding is constant and
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* does not vary based on allocation (most cases), we can at least
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* deduce a common code path for the get_width_for_height()/get_height_for_width()
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* cases by using the delta of the base size requsts.
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*/
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static void
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get_child_padding_delta (GtkBin *bin,
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gint *delta_h,
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gint *delta_v)
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{
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GtkBinPrivate *priv = bin->priv;
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gint hmin, vmin, hnat, vnat, child_hmin, child_vmin;
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/* we can't use gtk_widget_get_preferred_width() wrapper
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* because we want our "original" request, not any external
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* adjustments from set_size_request() or whatever. we have
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* to ask for natural also because NULL isn't allowed for the
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* direct vfuncs
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*/
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GTK_WIDGET_GET_CLASS (bin)->get_preferred_width (GTK_WIDGET (bin), &hmin, &hnat);
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GTK_WIDGET_GET_CLASS (bin)->adjust_size_request (GTK_WIDGET (bin),
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GTK_ORIENTATION_HORIZONTAL, &hmin, &hnat);
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GTK_WIDGET_GET_CLASS (bin)->get_preferred_height (GTK_WIDGET (bin), &vmin, &vnat);
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GTK_WIDGET_GET_CLASS (bin)->adjust_size_request (GTK_WIDGET (bin),
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GTK_ORIENTATION_VERTICAL, &vmin, &vnat);
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gtk_widget_get_preferred_width (priv->child, &child_hmin, NULL);
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gtk_widget_get_preferred_height (priv->child, &child_vmin, NULL);
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*delta_h = hmin - child_hmin;
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*delta_v = vmin - child_vmin;
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}
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static void
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gtk_bin_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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GtkBin *bin = GTK_BIN (widget);
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GtkBinPrivate *priv = bin->priv;
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if (priv->child)
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{
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gint child_min, child_nat;
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gtk_widget_get_preferred_width (priv->child,
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&child_min, &child_nat);
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*minimum_width = child_min;
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*natural_width = child_nat;
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}
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}
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static void
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gtk_bin_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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GtkBin *bin = GTK_BIN (widget);
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GtkBinPrivate *priv = bin->priv;
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if (priv->child)
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{
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gint child_min, child_nat;
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gtk_widget_get_preferred_height (priv->child,
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&child_min, &child_nat);
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*minimum_height = child_min;
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*natural_height = child_nat;
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}
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}
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static void
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gtk_bin_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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GtkBin *bin = GTK_BIN (widget);
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GtkBinPrivate *priv = bin->priv;
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gint hdelta, vdelta, child_min, child_nat;
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if (priv->child)
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{
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get_child_padding_delta (bin, &hdelta, &vdelta);
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gtk_widget_get_preferred_width_for_height (priv->child,
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height - vdelta,
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&child_min, &child_nat);
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if (minimum_width)
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*minimum_width = child_min + hdelta;
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if (natural_width)
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*natural_width = child_nat + hdelta;
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}
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else
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GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget, minimum_width, natural_width);
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}
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static void
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gtk_bin_get_preferred_height_for_width (GtkWidget *widget,
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gint width,
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gint *minimum_height,
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gint *natural_height)
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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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gint hdelta, vdelta, child_min, child_nat;
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if (priv->child)
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{
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get_child_padding_delta (bin, &hdelta, &vdelta);
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gtk_widget_get_preferred_height_for_width (priv->child,
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width - hdelta,
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&child_min, &child_nat);
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if (minimum_height)
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*minimum_height = child_min + vdelta;
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if (natural_height)
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*natural_height = child_nat + vdelta;
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}
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else
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GTK_WIDGET_GET_CLASS (widget)->get_preferred_height (widget, minimum_height, natural_height);
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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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gtk_widget_set_allocation (widget, allocation);
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if (priv->child)
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gtk_widget_size_allocate (priv->child, allocation);
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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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* Return value: (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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