gtk2/gtk/gtksizegroup.c
2021-03-11 16:37:38 +00:00

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/* GTK - The GIMP Toolkit
* gtksizegroup.c:
* Copyright (C) 2001 Red Hat Software
*
* 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 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/>.
*/
#include "config.h"
#include <string.h>
#include "gtkbuildable.h"
#include "gtkbuilderprivate.h"
#include "gtkwidget.h"
#include "gtkintl.h"
#include "gtktypebuiltins.h"
#include "gtkprivate.h"
#include "gtksizegroup-private.h"
#include "gtkwidgetprivate.h"
/**
* GtkSizeGroup
*
* `GtkSizeGroup` groups widgets together so they all request the same size.
*
* This is typically useful when you want a column of widgets to have the
* same size, but you cant use a `GtkGrid`.
*
* In detail, the size requested for each widget in a `GtkSizeGroup` is
* the maximum of the sizes that would have been requested for each
* widget in the size group if they were not in the size group. The mode
* of the size group (see [method@Gtk.SizeGroup.set_mode]) determines whether
* this applies to the horizontal size, the vertical size, or both sizes.
*
* Note that size groups only affect the amount of space requested, not
* the size that the widgets finally receive. If you want the widgets in
* a `GtkSizeGroup` to actually be the same size, you need to pack them in
* such a way that they get the size they request and not more.
*
* `GtkSizeGroup` objects are referenced by each widget in the size group,
* so once you have added all widgets to a `GtkSizeGroup`, you can drop
* the initial reference to the size group with g_object_unref(). If the
* widgets in the size group are subsequently destroyed, then they will
* be removed from the size group and drop their references on the size
* group; when all widgets have been removed, the size group will be
* freed.
*
* Widgets can be part of multiple size groups; GTK will compute the
* horizontal size of a widget from the horizontal requisition of all
* widgets that can be reached from the widget by a chain of size groups
* of type %GTK_SIZE_GROUP_HORIZONTAL or %GTK_SIZE_GROUP_BOTH, and the
* vertical size from the vertical requisition of all widgets that can be
* reached from the widget by a chain of size groups of type
* %GTK_SIZE_GROUP_VERTICAL or %GTK_SIZE_GROUP_BOTH.
*
* Note that only non-contextual sizes of every widget are ever consulted
* by size groups (since size groups have no knowledge of what size a widget
* will be allocated in one dimension, it cannot derive how much height
* a widget will receive for a given width). When grouping widgets that
* trade height for width in mode %GTK_SIZE_GROUP_VERTICAL or %GTK_SIZE_GROUP_BOTH:
* the height for the minimum width will be the requested height for all
* widgets in the group. The same is of course true when horizontally grouping
* width for height widgets.
*
* Widgets that trade height-for-width should set a reasonably large minimum
* width by way of [property@Gtk.Label:width-chars] for instance. Widgets with
* static sizes as well as widgets that grow (such as ellipsizing text) need no
* such considerations.
*
* # GtkSizeGroup as GtkBuildable
*
* Size groups can be specified in a UI definition by placing an <object>
* element with `class="GtkSizeGroup"` somewhere in the UI definition. The
* widgets that belong to the size group are specified by a <widgets> element
* that may contain multiple <widget> elements, one for each member of the
* size group. The ”name” attribute gives the id of the widget.
*
* An example of a UI definition fragment with `GtkSizeGroup`:
* ```xml
* <object class="GtkSizeGroup">
* <property name="mode">horizontal</property>
* <widgets>
* <widget name="radio1"/>
* <widget name="radio2"/>
* </widgets>
* </object>
* ```
*/
typedef struct _GtkSizeGroupClass GtkSizeGroupClass;
typedef struct _GtkSizeGroupPrivate GtkSizeGroupPrivate;
struct _GtkSizeGroupClass
{
GObjectClass parent_class;
};
struct _GtkSizeGroupPrivate
{
GSList *widgets;
guint8 mode;
};
enum {
PROP_0,
PROP_MODE
};
static void gtk_size_group_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_size_group_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
/* GtkBuildable */
static void gtk_size_group_buildable_init (GtkBuildableIface *iface);
static gboolean gtk_size_group_buildable_custom_tag_start (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const char *tagname,
GtkBuildableParser *parser,
gpointer *data);
static void gtk_size_group_buildable_custom_finished (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const char *tagname,
gpointer user_data);
G_STATIC_ASSERT (GTK_SIZE_GROUP_HORIZONTAL == (1 << GTK_ORIENTATION_HORIZONTAL));
G_STATIC_ASSERT (GTK_SIZE_GROUP_VERTICAL == (1 << GTK_ORIENTATION_VERTICAL));
G_STATIC_ASSERT (GTK_SIZE_GROUP_BOTH == (GTK_SIZE_GROUP_HORIZONTAL | GTK_SIZE_GROUP_VERTICAL));
G_DEFINE_TYPE_WITH_CODE (GtkSizeGroup, gtk_size_group, G_TYPE_OBJECT,
G_ADD_PRIVATE (GtkSizeGroup)
G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
gtk_size_group_buildable_init))
static void
add_widget_to_closure (GHashTable *widgets,
GHashTable *groups,
GtkWidget *widget,
int orientation)
{
GSList *tmp_groups, *tmp_widgets;
if (g_hash_table_lookup (widgets, widget))
return;
g_hash_table_add (widgets, widget);
for (tmp_groups = _gtk_widget_get_sizegroups (widget); tmp_groups; tmp_groups = tmp_groups->next)
{
GtkSizeGroup *tmp_group = tmp_groups->data;
GtkSizeGroupPrivate *tmp_priv = gtk_size_group_get_instance_private (tmp_group);
if (g_hash_table_lookup (groups, tmp_group))
continue;
if (orientation >= 0 && !(tmp_priv->mode & (1 << orientation)))
continue;
g_hash_table_add (groups, tmp_group);
for (tmp_widgets = tmp_priv->widgets; tmp_widgets; tmp_widgets = tmp_widgets->next)
add_widget_to_closure (widgets, groups, tmp_widgets->data, orientation);
}
}
GHashTable *
_gtk_size_group_get_widget_peers (GtkWidget *for_widget,
GtkOrientation orientation)
{
GHashTable *widgets, *groups;
widgets = g_hash_table_new (NULL, NULL);
groups = g_hash_table_new (NULL, NULL);
add_widget_to_closure (widgets, groups, for_widget, orientation);
g_hash_table_unref (groups);
return widgets;
}
static void
queue_resize_on_group (GtkSizeGroup *size_group)
{
GtkSizeGroupPrivate *priv = gtk_size_group_get_instance_private (size_group);
GSList *list;
for (list = priv->widgets; list; list = list->next)
{
gtk_widget_queue_resize (list->data);
}
}
static void
gtk_size_group_class_init (GtkSizeGroupClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gtk_size_group_set_property;
gobject_class->get_property = gtk_size_group_get_property;
/**
* GtkSizeGroup:mode: (attributes org.gtk.Property.get=gtk_size_group_get_mode org.gtk.Property.set=gtk_size_group_set_mode)
*
* The direction in which the size group affects requested sizes.
*/
g_object_class_install_property (gobject_class,
PROP_MODE,
g_param_spec_enum ("mode",
P_("Mode"),
P_("The directions in which the size group affects the requested sizes"
" of its component widgets"),
GTK_TYPE_SIZE_GROUP_MODE,
GTK_SIZE_GROUP_HORIZONTAL,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
}
static void
gtk_size_group_init (GtkSizeGroup *size_group)
{
GtkSizeGroupPrivate *priv;
priv = gtk_size_group_get_instance_private (size_group);
priv->widgets = NULL;
priv->mode = GTK_SIZE_GROUP_HORIZONTAL;
}
static void
gtk_size_group_buildable_init (GtkBuildableIface *iface)
{
iface->custom_tag_start = gtk_size_group_buildable_custom_tag_start;
iface->custom_finished = gtk_size_group_buildable_custom_finished;
}
static void
gtk_size_group_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkSizeGroup *size_group = GTK_SIZE_GROUP (object);
switch (prop_id)
{
case PROP_MODE:
gtk_size_group_set_mode (size_group, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_size_group_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkSizeGroup *size_group = GTK_SIZE_GROUP (object);
GtkSizeGroupPrivate *priv = gtk_size_group_get_instance_private (size_group);
switch (prop_id)
{
case PROP_MODE:
g_value_set_enum (value, priv->mode);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gtk_size_group_new:
* @mode: the mode for the new size group.
*
* Create a new `GtkSizeGroup`.
*
* Returns: a newly created `GtkSizeGroup`
*/
GtkSizeGroup *
gtk_size_group_new (GtkSizeGroupMode mode)
{
GtkSizeGroup *size_group = g_object_new (GTK_TYPE_SIZE_GROUP, NULL);
GtkSizeGroupPrivate *priv = gtk_size_group_get_instance_private (size_group);
priv->mode = mode;
return size_group;
}
/**
* gtk_size_group_set_mode: (attributes org.gtk.Method.set_property=mode)
* @size_group: a `GtkSizeGroup`
* @mode: the mode to set for the size group.
*
* Sets the `GtkSizeGroupMode` of the size group.
*
* The mode of the size group determines whether the widgets in the
* size group should all have the same horizontal requisition
* (%GTK_SIZE_GROUP_HORIZONTAL) all have the same vertical requisition
* (%GTK_SIZE_GROUP_VERTICAL), or should all have the same requisition
* in both directions (%GTK_SIZE_GROUP_BOTH).
*/
void
gtk_size_group_set_mode (GtkSizeGroup *size_group,
GtkSizeGroupMode mode)
{
GtkSizeGroupPrivate *priv = gtk_size_group_get_instance_private (size_group);
g_return_if_fail (GTK_IS_SIZE_GROUP (size_group));
if (priv->mode != mode)
{
if (priv->mode != GTK_SIZE_GROUP_NONE)
queue_resize_on_group (size_group);
priv->mode = mode;
if (priv->mode != GTK_SIZE_GROUP_NONE)
queue_resize_on_group (size_group);
g_object_notify (G_OBJECT (size_group), "mode");
}
}
/**
* gtk_size_group_get_mode: (attributes org.gtk.Method.get_property=mode)
* @size_group: a `GtkSizeGroup`
*
* Gets the current mode of the size group.
*
* Returns: the current mode of the size group.
*/
GtkSizeGroupMode
gtk_size_group_get_mode (GtkSizeGroup *size_group)
{
GtkSizeGroupPrivate *priv = gtk_size_group_get_instance_private (size_group);
g_return_val_if_fail (GTK_IS_SIZE_GROUP (size_group), GTK_SIZE_GROUP_BOTH);
return priv->mode;
}
/**
* gtk_size_group_add_widget:
* @size_group: a `GtkSizeGroup`
* @widget: the `GtkWidget` to add
*
* Adds a widget to a `GtkSizeGroup`.
*
* In the future, the requisition
* of the widget will be determined as the maximum of its requisition
* and the requisition of the other widgets in the size group.
* Whether this applies horizontally, vertically, or in both directions
* depends on the mode of the size group.
* See [method@Gtk.SizeGroup.set_mode].
*
* When the widget is destroyed or no longer referenced elsewhere, it
* will be removed from the size group.
*/
void
gtk_size_group_add_widget (GtkSizeGroup *size_group,
GtkWidget *widget)
{
GtkSizeGroupPrivate *priv = gtk_size_group_get_instance_private (size_group);
GSList *groups;
g_return_if_fail (GTK_IS_SIZE_GROUP (size_group));
g_return_if_fail (GTK_IS_WIDGET (widget));
groups = _gtk_widget_get_sizegroups (widget);
if (!g_slist_find (groups, size_group))
{
_gtk_widget_add_sizegroup (widget, size_group);
priv->widgets = g_slist_prepend (priv->widgets, widget);
g_object_ref (size_group);
}
queue_resize_on_group (size_group);
}
/**
* gtk_size_group_remove_widget:
* @size_group: a `GtkSizeGroup`
* @widget: the `GtkWidget` to remove
*
* Removes a widget from a `GtkSizeGroup`.
*/
void
gtk_size_group_remove_widget (GtkSizeGroup *size_group,
GtkWidget *widget)
{
GtkSizeGroupPrivate *priv = gtk_size_group_get_instance_private (size_group);
g_return_if_fail (GTK_IS_SIZE_GROUP (size_group));
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (g_slist_find (priv->widgets, widget));
_gtk_widget_remove_sizegroup (widget, size_group);
priv->widgets = g_slist_remove (priv->widgets, widget);
queue_resize_on_group (size_group);
gtk_widget_queue_resize (widget);
g_object_unref (size_group);
}
/**
* gtk_size_group_get_widgets:
* @size_group: a `GtkSizeGroup`
*
* Returns the list of widgets associated with @size_group.
*
* Returns: (element-type GtkWidget) (transfer none): a `GSList` of
* widgets. The list is owned by GTK and should not be modified.
*/
GSList *
gtk_size_group_get_widgets (GtkSizeGroup *size_group)
{
GtkSizeGroupPrivate *priv = gtk_size_group_get_instance_private (size_group);
return priv->widgets;
}
typedef struct {
char *name;
int line;
int col;
} ItemData;
static void
item_data_free (gpointer data)
{
ItemData *item_data = data;
g_free (item_data->name);
g_free (item_data);
}
typedef struct {
GObject *object;
GtkBuilder *builder;
GSList *items;
} GSListSubParserData;
static void
size_group_start_element (GtkBuildableParseContext *context,
const char *element_name,
const char **names,
const char **values,
gpointer user_data,
GError **error)
{
GSListSubParserData *data = (GSListSubParserData*)user_data;
if (strcmp (element_name, "widget") == 0)
{
const char *name;
ItemData *item_data;
if (!_gtk_builder_check_parent (data->builder, context, "widgets", error))
return;
if (!g_markup_collect_attributes (element_name, names, values, error,
G_MARKUP_COLLECT_STRING, "name", &name,
G_MARKUP_COLLECT_INVALID))
{
_gtk_builder_prefix_error (data->builder, context, error);
return;
}
item_data = g_new (ItemData, 1);
item_data->name = g_strdup (name);
gtk_buildable_parse_context_get_position (context, &item_data->line, &item_data->col);
data->items = g_slist_prepend (data->items, item_data);
}
else if (strcmp (element_name, "widgets") == 0)
{
if (!_gtk_builder_check_parent (data->builder, context, "object", error))
return;
if (!g_markup_collect_attributes (element_name, names, values, error,
G_MARKUP_COLLECT_INVALID, NULL, NULL,
G_MARKUP_COLLECT_INVALID))
_gtk_builder_prefix_error (data->builder, context, error);
}
else
{
_gtk_builder_error_unhandled_tag (data->builder, context,
"GtkSizeGroup", element_name,
error);
}
}
static const GtkBuildableParser size_group_parser =
{
size_group_start_element
};
static gboolean
gtk_size_group_buildable_custom_tag_start (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const char *tagname,
GtkBuildableParser *parser,
gpointer *parser_data)
{
GSListSubParserData *data;
if (child)
return FALSE;
if (strcmp (tagname, "widgets") == 0)
{
data = g_slice_new0 (GSListSubParserData);
data->items = NULL;
data->object = G_OBJECT (buildable);
data->builder = builder;
*parser = size_group_parser;
*parser_data = data;
return TRUE;
}
return FALSE;
}
static void
gtk_size_group_buildable_custom_finished (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const char *tagname,
gpointer user_data)
{
GSList *l;
GSListSubParserData *data;
GObject *object;
if (strcmp (tagname, "widgets") != 0)
return;
data = (GSListSubParserData*)user_data;
data->items = g_slist_reverse (data->items);
for (l = data->items; l; l = l->next)
{
ItemData *item_data = l->data;
object = _gtk_builder_lookup_object (builder, item_data->name, item_data->line, item_data->col);
if (!object)
continue;
gtk_size_group_add_widget (GTK_SIZE_GROUP (data->object), GTK_WIDGET (object));
}
g_slist_free_full (data->items, item_data_free);
g_slice_free (GSListSubParserData, data);
}