gtk2/gtk/gtkcenterbox.c

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/*
* Copyright (c) 2017 Timm Bäder <mail@baedert.org>
*
* This program 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 of the License, or (at your
* option) any later version.
*
* This program 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 program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author: Timm Bäder <mail@baedert.org>
*/
/**
* SECTION:gtkcenterbox
* @Short_description: A centering container
* @Title: GtkCenterBox
* @See_also: #GtkBox
*
* The GtkCenterBox widget arranges three children in a horizontal
* or vertical arrangement, keeping the middle child centered as well
* as possible.
*
* To add children to GtkCenterBox, use gtk_center_box_set_start_widget(),
* gtk_center_box_set_center_widget() and gtk_center_box_set_end_widget().
*
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* The sizing and positioning of children can be influenced with the
* align and expand properties of the children.
*
* # GtkCenterBox as GtkBuildable
*
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* The GtkCenterBox implementation of the #GtkBuildable interface supports
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* placing children in the 3 positions by specifying start, center or
* end as the type attribute of a <child> element.
*
* # CSS nodes
*
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* GtkCenterBox uses a single CSS node with the name box,
*
* The first child of the #GtkCenterBox will be allocated depending on the
* text direction, i.e. in left-to-right layouts it will be allocated on the
* left and in right-to-left layouts on the right.
*
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* In vertical orientation, the nodes of the children are arranged from top to
* bottom.
*/
#include "config.h"
#include "gtkcenterbox.h"
#include "gtkcenterlayout.h"
#include "gtkcssnodeprivate.h"
#include "gtkwidgetprivate.h"
#include "gtkorientable.h"
#include "gtkorientableprivate.h"
#include "gtkbuildable.h"
#include "gtksizerequest.h"
#include "gtktypebuiltins.h"
#include "gtkprivate.h"
#include "gtkintl.h"
struct _GtkCenterBox
{
GtkWidget parent_instance;
GtkWidget *start_widget;
GtkWidget *center_widget;
GtkWidget *end_widget;
};
struct _GtkCenterBoxClass
{
GtkWidgetClass parent_class;
};
enum {
PROP_0,
PROP_BASELINE_POSITION,
PROP_ORIENTATION
};
static GtkBuildableIface *parent_buildable_iface;
static void gtk_center_box_buildable_init (GtkBuildableIface *iface);
G_DEFINE_TYPE_WITH_CODE (GtkCenterBox, gtk_center_box, GTK_TYPE_WIDGET,
G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL)
G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE, gtk_center_box_buildable_init))
static void
gtk_center_box_buildable_add_child (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *type)
{
if (g_strcmp0 (type, "start") == 0)
gtk_center_box_set_start_widget (GTK_CENTER_BOX (buildable), GTK_WIDGET (child));
else if (g_strcmp0 (type, "center") == 0)
gtk_center_box_set_center_widget (GTK_CENTER_BOX (buildable), GTK_WIDGET (child));
else if (g_strcmp0 (type, "end") == 0)
gtk_center_box_set_end_widget (GTK_CENTER_BOX (buildable), GTK_WIDGET (child));
else
parent_buildable_iface->add_child (buildable, builder, child, type);
}
static void
gtk_center_box_buildable_init (GtkBuildableIface *iface)
{
parent_buildable_iface = g_type_interface_peek_parent (iface);
iface->add_child = gtk_center_box_buildable_add_child;
}
static void
gtk_center_box_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkCenterBox *self = GTK_CENTER_BOX (object);
GtkLayoutManager *layout = gtk_widget_get_layout_manager (GTK_WIDGET (object));
switch (prop_id)
{
case PROP_BASELINE_POSITION:
gtk_center_box_set_baseline_position (self, g_value_get_enum (value));
break;
case PROP_ORIENTATION:
{
GtkOrientation orientation = g_value_get_enum (value);
GtkOrientation current = gtk_center_layout_get_orientation (GTK_CENTER_LAYOUT (layout));
if (current != orientation)
{
gtk_center_layout_set_orientation (GTK_CENTER_LAYOUT (layout), orientation);
_gtk_orientable_set_style_classes (GTK_ORIENTABLE (self));
gtk_widget_queue_resize (GTK_WIDGET (self));
g_object_notify (object, "orientation");
}
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_center_box_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkLayoutManager *layout = gtk_widget_get_layout_manager (GTK_WIDGET (object));
switch (prop_id)
{
case PROP_BASELINE_POSITION:
g_value_set_enum (value, gtk_center_layout_get_baseline_position (GTK_CENTER_LAYOUT (layout)));
break;
case PROP_ORIENTATION:
g_value_set_enum (value, gtk_center_layout_get_orientation (GTK_CENTER_LAYOUT (layout)));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
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static void
gtk_center_box_dispose (GObject *object)
{
GtkCenterBox *self = GTK_CENTER_BOX (object);
g_clear_pointer (&self->start_widget, gtk_widget_unparent);
g_clear_pointer (&self->center_widget, gtk_widget_unparent);
g_clear_pointer (&self->end_widget, gtk_widget_unparent);
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G_OBJECT_CLASS (gtk_center_box_parent_class)->dispose (object);
}
static void
gtk_center_box_class_init (GtkCenterBoxClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
object_class->set_property = gtk_center_box_set_property;
object_class->get_property = gtk_center_box_get_property;
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object_class->dispose = gtk_center_box_dispose;
g_object_class_override_property (object_class, PROP_ORIENTATION, "orientation");
g_object_class_install_property (object_class, PROP_BASELINE_POSITION,
g_param_spec_enum ("baseline-position",
P_("Baseline position"),
P_("The position of the baseline aligned widgets if extra space is available"),
GTK_TYPE_BASELINE_POSITION,
GTK_BASELINE_POSITION_CENTER,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_FILLER);
gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_CENTER_LAYOUT);
gtk_widget_class_set_css_name (widget_class, I_("box"));
}
static void
gtk_center_box_init (GtkCenterBox *self)
{
self->start_widget = NULL;
self->center_widget = NULL;
self->end_widget = NULL;
}
/**
* gtk_center_box_new:
*
* Creates a new #GtkCenterBox.
*
* Returns: the new #GtkCenterBox.
*/
GtkWidget *
gtk_center_box_new (void)
{
return GTK_WIDGET (g_object_new (GTK_TYPE_CENTER_BOX, NULL));
}
/**
* gtk_center_box_set_start_widget:
* @self: a #GtkCenterBox
* @child: (nullable): the new start widget, or %NULL
*
* Sets the start widget. To remove the existing start widget, pass %NULL.
*/
void
gtk_center_box_set_start_widget (GtkCenterBox *self,
GtkWidget *child)
{
GtkLayoutManager *layout_manager;
if (self->start_widget)
gtk_widget_unparent (self->start_widget);
self->start_widget = child;
if (child)
gtk_widget_insert_after (child, GTK_WIDGET (self), NULL);
layout_manager = gtk_widget_get_layout_manager (GTK_WIDGET (self));
gtk_center_layout_set_start_widget (GTK_CENTER_LAYOUT (layout_manager), child);
}
/**
* gtk_center_box_set_center_widget:
* @self: a #GtkCenterBox
* @child: (nullable): the new center widget, or %NULL
*
* Sets the center widget. To remove the existing center widget, pas %NULL.
*/
void
gtk_center_box_set_center_widget (GtkCenterBox *self,
GtkWidget *child)
{
GtkLayoutManager *layout_manager;
if (self->center_widget)
gtk_widget_unparent (self->center_widget);
self->center_widget = child;
if (child)
gtk_widget_insert_after (child, GTK_WIDGET (self), self->start_widget);
layout_manager = gtk_widget_get_layout_manager (GTK_WIDGET (self));
gtk_center_layout_set_center_widget (GTK_CENTER_LAYOUT (layout_manager), child);
}
/**
* gtk_center_box_set_end_widget:
* @self: a #GtkCenterBox
* @child: (nullable): the new end widget, or %NULL
*
* Sets the end widget. To remove the existing end widget, pass %NULL.
*/
void
gtk_center_box_set_end_widget (GtkCenterBox *self,
GtkWidget *child)
{
GtkLayoutManager *layout_manager;
if (self->end_widget)
gtk_widget_unparent (self->end_widget);
self->end_widget = child;
if (child)
gtk_widget_insert_before (child, GTK_WIDGET (self), NULL);
layout_manager = gtk_widget_get_layout_manager (GTK_WIDGET (self));
gtk_center_layout_set_end_widget (GTK_CENTER_LAYOUT (layout_manager), child);
}
/**
* gtk_center_box_get_start_widget:
* @self: a #GtkCenterBox
*
* Gets the start widget, or %NULL if there is none.
*
* Returns: (transfer none) (nullable): the start widget.
*/
GtkWidget *
gtk_center_box_get_start_widget (GtkCenterBox *self)
{
return self->start_widget;
}
/**
* gtk_center_box_get_center_widget:
* @self: a #GtkCenterBox
*
* Gets the center widget, or %NULL if there is none.
*
* Returns: (transfer none) (nullable): the center widget.
*/
GtkWidget *
gtk_center_box_get_center_widget (GtkCenterBox *self)
{
return self->center_widget;
}
/**
* gtk_center_box_get_end_widget:
* @self: a #GtkCenterBox
*
* Gets the end widget, or %NULL if there is none.
*
* Returns: (transfer none) (nullable): the end widget.
*/
GtkWidget *
gtk_center_box_get_end_widget (GtkCenterBox *self)
{
return self->end_widget;
}
/**
* gtk_center_box_set_baseline_position:
* @self: a #GtkCenterBox
* @position: a #GtkBaselinePosition
*
* Sets the baseline position of a center box.
*
* This affects only horizontal boxes with at least one baseline
* aligned child. If there is more vertical space available than
* requested, and the baseline is not allocated by the parent then
* @position is used to allocate the baseline wrt. the extra space
* available.
*/
void
gtk_center_box_set_baseline_position (GtkCenterBox *self,
GtkBaselinePosition position)
{
GtkBaselinePosition current_position;
GtkLayoutManager *layout;
g_return_if_fail (GTK_IS_CENTER_BOX (self));
layout = gtk_widget_get_layout_manager (GTK_WIDGET (self));
current_position = gtk_center_layout_get_baseline_position (GTK_CENTER_LAYOUT (layout));
if (current_position != position)
{
gtk_center_layout_set_baseline_position (GTK_CENTER_LAYOUT (layout), position);
g_object_notify (G_OBJECT (self), "baseline-position");
gtk_widget_queue_resize (GTK_WIDGET (self));
}
}
/**
* gtk_center_box_get_baseline_position:
* @self: a #GtkCenterBox
*
* Gets the value set by gtk_center_box_set_baseline_position().
*
* Returns: the baseline position
*/
GtkBaselinePosition
gtk_center_box_get_baseline_position (GtkCenterBox *self)
{
GtkLayoutManager *layout;
g_return_val_if_fail (GTK_IS_CENTER_BOX (self), GTK_BASELINE_POSITION_CENTER);
layout = gtk_widget_get_layout_manager (GTK_WIDGET (self));
return gtk_center_layout_get_baseline_position (GTK_CENTER_LAYOUT (layout));
}