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Add horizontal and vertical expand flags, compute_expand() to GtkWidget

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GtkWidget now has flags for horizontal and vertical expand, and
a compute_expand() method. compute_expand() is used by containers
to set a default expand flag. (If a widget has expand set explicitly,
it always overrides the results of compute_expand.)

GtkContainer has a default implementation of compute_expand which
simply walks over all child widgets and sets expand=TRUE
if any child is expanding.

The overall effect is that you only have to set expand on
leaf nodes in the widget tree, while previously you had to
set expand all the way up the tree as you packed every
container. Also, now containers need not have their own child
properties for expand.

For old containers which do have "expand" child properties,
they should override compute_expand and include the child
properties in whether the container is expand=TRUE.
Also, the old container should use
"child_prop_expand || gtk_widget_compute_expand()" everywhere
it previously used simply "child_prop_expand"

https://bugzilla.gnome.org/show_bug.cgi?id=628902
This commit is contained in:
Havoc Pennington 2010-09-06 12:26:32 -04:00 committed by Matthias Clasen
parent 7d5a85c3ad
commit 031856eb33
3 changed files with 678 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
gtk/gtkcontainer.c
View File

@ -302,6 +302,9 @@ static void gtk_container_add_unimplemented (GtkContainer *container
static void gtk_container_remove_unimplemented (GtkContainer *container,
GtkWidget *widget);
static void gtk_container_real_check_resize (GtkContainer *container);
static void gtk_container_compute_expand (GtkWidget *widget,
gboolean *hexpand_p,
gboolean *vexpand_p);
static gboolean gtk_container_focus (GtkWidget *widget,
GtkDirectionType direction);
static void gtk_container_real_set_focus_child (GtkContainer *container,
@ -443,6 +446,7 @@ gtk_container_class_init (GtkContainerClass *class)
gobject_class->get_property = gtk_container_get_property;
widget_class->destroy = gtk_container_destroy;
widget_class->compute_expand = gtk_container_compute_expand;
widget_class->show_all = gtk_container_show_all;
widget_class->hide_all = gtk_container_hide_all;
widget_class->draw = gtk_container_draw;
@ -2069,6 +2073,53 @@ _gtk_container_child_composite_name (GtkContainer *container,
return NULL;
}
typedef struct {
gboolean hexpand;
gboolean vexpand;
} ComputeExpandData;
static void
gtk_container_compute_expand_callback (GtkWidget *widget,
gpointer client_data)
{
ComputeExpandData *data = client_data;
/* note that we don't get_expand on the child if we already know we
* have to expand, so we only recurse into children until we find
* one that expands and then we basically don't do any more
* work. This means that we can leave some children in a
* need_compute_expand state, which is fine, as long as GtkWidget
* doesn't rely on an invariant that "if a child has
* need_compute_expand, its parents also do"
*
* gtk_widget_compute_expand() always returns FALSE if the
* child is !visible so that's taken care of.
*/
data->hexpand = data->hexpand ||
gtk_widget_compute_expand (widget, GTK_ORIENTATION_HORIZONTAL);
data->vexpand = data->vexpand ||
gtk_widget_compute_expand (widget, GTK_ORIENTATION_VERTICAL);
}
static void
gtk_container_compute_expand (GtkWidget *widget,
gboolean *hexpand_p,
gboolean *vexpand_p)
{
ComputeExpandData data;
data.hexpand = FALSE;
data.vexpand = FALSE;
gtk_container_forall (GTK_CONTAINER (widget),
gtk_container_compute_expand_callback,
&data);
*hexpand_p = data.hexpand;
*vexpand_p = data.vexpand;
}
static void
gtk_container_real_set_focus_child (GtkContainer *container,
GtkWidget *child)

605
gtk/gtkwidget.c
View File

@ -272,6 +272,15 @@ struct _GtkWidgetPrivate
guint width_request_needed : 1;
guint height_request_needed : 1;
/* Expand-related flags */
guint need_compute_expand : 1; /* Need to recompute computed_[hv]_expand */
guint computed_hexpand : 1; /* computed results (composite of child flags) */
guint computed_vexpand : 1;
guint hexpand : 1; /* application-forced expand */
guint vexpand : 1;
guint hexpand_set : 1; /* whether to use application-forced */
guint vexpand_set : 1; /* instead of computing from children */
/* The widget's name. If the widget does not have a name
* (the name is NULL), then its name (as returned by
* "gtk_widget_get_name") is its class's name.
@ -410,7 +419,12 @@ enum {
PROP_MARGIN_RIGHT,
PROP_MARGIN_TOP,
PROP_MARGIN_BOTTOM,
PROP_MARGIN
PROP_MARGIN,
PROP_HEXPAND,
PROP_VEXPAND,
PROP_HEXPAND_SET,
PROP_VEXPAND_SET,
PROP_EXPAND
};
typedef struct _GtkStateData GtkStateData;
@ -1179,6 +1193,81 @@ gtk_widget_class_init (GtkWidgetClass *klass)
_gtk_marshal_VOID__VOID,
G_TYPE_NONE, 0);
/**
* GtkWidget:hexpand
*
* Whether to expand horizontally. See gtk_widget_set_hexpand().
*
* Since: 3.0
*/
g_object_class_install_property (gobject_class,
PROP_HEXPAND,
g_param_spec_boolean ("hexpand",
P_("Horizontal Expand"),
P_("Whether widget wants more horizontal space"),
FALSE,
GTK_PARAM_READWRITE));
/**
* GtkWidget:hexpand-set
*
* Whether to use the GtkWidget:hexpand property. See gtk_widget_get_hexpand_set().
*
* Since: 3.0
*/
g_object_class_install_property (gobject_class,
PROP_HEXPAND_SET,
g_param_spec_boolean ("hexpand-set",
P_("Horizontal Expand Set"),
P_("Whether to use the hexpand property"),
FALSE,
GTK_PARAM_READWRITE));
/**
* GtkWidget:vexpand
*
* Whether to expand vertically. See gtk_widget_set_vexpand().
*
* Since: 3.0
*/
g_object_class_install_property (gobject_class,
PROP_VEXPAND,
g_param_spec_boolean ("vexpand",
P_("Vertical Expand"),
P_("Whether widget wants more vertical space"),
FALSE,
GTK_PARAM_READWRITE));
/**
* GtkWidget:vexpand-set
*
* Whether to use the GtkWidget:vexpand property. See gtk_widget_get_vexpand_set().
*
* Since: 3.0
*/
g_object_class_install_property (gobject_class,
PROP_VEXPAND_SET,
g_param_spec_boolean ("vexpand-set",
P_("Vertical Expand Set"),
P_("Whether to use the vexpand property"),
FALSE,
GTK_PARAM_READWRITE));
/**
* GtkWidget:expand
*
* Whether to expand in both directions. Setting this sets both GtkWidget:hexpand and GtkWidget:vexpand
*
* Since: 3.0
*/
g_object_class_install_property (gobject_class,
PROP_EXPAND,
g_param_spec_boolean ("expand",
P_("Expand Both"),
P_("Whether widget wants to expand in both directions"),
FALSE,
GTK_PARAM_READWRITE));
/**
* GtkWidget::show:
* @widget: the object which received the signal.
@ -3146,6 +3235,24 @@ gtk_widget_set_property (GObject *object,
gtk_widget_set_margin_bottom (widget, g_value_get_int (value));
g_object_thaw_notify (G_OBJECT (widget));
break;
case PROP_HEXPAND:
gtk_widget_set_hexpand (widget, g_value_get_boolean (value));
break;
case PROP_HEXPAND_SET:
gtk_widget_set_hexpand_set (widget, g_value_get_boolean (value));
break;
case PROP_VEXPAND:
gtk_widget_set_vexpand (widget, g_value_get_boolean (value));
break;
case PROP_VEXPAND_SET:
gtk_widget_set_vexpand_set (widget, g_value_get_boolean (value));
break;
case PROP_EXPAND:
g_object_freeze_notify (G_OBJECT (widget));
gtk_widget_set_hexpand (widget, g_value_get_boolean (value));
gtk_widget_set_vexpand (widget, g_value_get_boolean (value));
g_object_thaw_notify (G_OBJECT (widget));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -3290,6 +3397,23 @@ gtk_widget_get_property (GObject *object,
}
}
break;
case PROP_HEXPAND:
g_value_set_boolean (value, gtk_widget_get_hexpand (widget));
break;
case PROP_HEXPAND_SET:
g_value_set_boolean (value, gtk_widget_get_hexpand_set (widget));
break;
case PROP_VEXPAND:
g_value_set_boolean (value, gtk_widget_get_vexpand (widget));
break;
case PROP_VEXPAND_SET:
g_value_set_boolean (value, gtk_widget_get_vexpand_set (widget));
break;
case PROP_EXPAND:
g_value_set_boolean (value,
gtk_widget_get_hexpand (widget) &&
gtk_widget_get_vexpand (widget));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -3326,6 +3450,15 @@ gtk_widget_init (GtkWidget *widget)
priv->height_request_needed = TRUE;
priv->alloc_needed = TRUE;
/* this will be set to TRUE if the widget gets a child or if the
* expand flag is set on the widget, but until one of those happen
* we know the expand is already properly FALSE.
*
* We really want to default FALSE here to avoid computing expand
* all over the place while initially building a widget tree.
*/
priv->need_compute_expand = FALSE;
priv->style = gtk_widget_get_default_style ();
g_object_ref (priv->style);
}
@ -3559,13 +3692,26 @@ gtk_widget_unparent (GtkWidget *widget)
old_parent = priv->parent;
priv->parent = NULL;
gtk_widget_set_parent_window (widget, NULL);
/* parent may no longer expand if the removed
* child was expand=TRUE and could therefore
* be forcing it to.
*/
if (gtk_widget_get_visible (widget) &&
(priv->need_compute_expand ||
priv->computed_hexpand ||
priv->computed_vexpand))
{
gtk_widget_queue_compute_expand (old_parent);
}
g_signal_emit (widget, widget_signals[PARENT_SET], 0, old_parent);
if (toplevel)
{
_gtk_widget_propagate_hierarchy_changed (widget, toplevel);
g_object_unref (toplevel);
}
g_object_notify (G_OBJECT (widget), "parent");
g_object_thaw_notify (G_OBJECT (widget));
if (!priv->parent)
@ -3654,6 +3800,17 @@ gtk_widget_show (GtkWidget *widget)
g_object_ref (widget);
if (!gtk_widget_is_toplevel (widget))
gtk_widget_queue_resize (widget);
/* see comment in set_parent() for why this should and can be
* conditional
*/
if (widget->priv->need_compute_expand ||
widget->priv->computed_hexpand ||
widget->priv->computed_vexpand)
{
gtk_widget_queue_compute_expand (widget);
}
g_signal_emit (widget, widget_signals[SHOW], 0);
g_object_notify (G_OBJECT (widget), "visible");
g_object_unref (widget);
@ -3740,6 +3897,14 @@ gtk_widget_hide (GtkWidget *widget)
if (toplevel != widget && gtk_widget_is_toplevel (toplevel))
_gtk_window_unset_focus_and_default (GTK_WINDOW (toplevel), widget);
/* a parent may now be expand=FALSE since we're hidden. */
if (widget->priv->need_compute_expand ||
widget->priv->computed_hexpand ||
widget->priv->computed_vexpand)
{
gtk_widget_queue_compute_expand (widget);
}
g_signal_emit (widget, widget_signals[HIDE], 0);
if (!gtk_widget_is_toplevel (widget))
gtk_widget_queue_resize (widget);
@ -7201,6 +7366,24 @@ gtk_widget_set_parent (GtkWidget *widget,
gtk_widget_queue_resize (widget);
}
/* child may cause parent's expand to change, if the child is
* expanded. If child is not expanded, then it can't modify the
* parent's expand. If the child becomes expanded later then it will
* queue compute_expand then. This optimization plus defaulting
* newly-constructed widgets to need_compute_expand=FALSE should
* mean that initially building a widget tree doesn't have to keep
* walking up setting need_compute_expand on parents over and over.
*
* We can't change a parent to need to expand unless we're visible.
*/
if (gtk_widget_get_visible (widget) &&
(priv->need_compute_expand ||
priv->computed_hexpand ||
priv->computed_vexpand))
{
gtk_widget_queue_compute_expand (parent);
}
}
/**
@ -10989,6 +11172,424 @@ gtk_widget_ref_accessible (AtkImplementor *implementor)
return accessible;
}
/*
* Expand flag management
*/
static void
gtk_widget_update_computed_expand (GtkWidget *widget)
{
GtkWidgetPrivate *priv;
priv = widget->priv;
if (priv->need_compute_expand)
{
gboolean h, v;
if (priv->hexpand_set)
h = priv->hexpand;
else
h = FALSE;
if (priv->vexpand_set)
v = priv->vexpand;
else
v = FALSE;
/* we don't need to use compute_expand if both expands are
* forced by the app
*/
if (!(priv->hexpand_set && priv->vexpand_set))
{
if (GTK_WIDGET_GET_CLASS (widget)->compute_expand != NULL)
{
gboolean ignored;
GTK_WIDGET_GET_CLASS (widget)->compute_expand (widget,
priv->hexpand_set ? &ignored : &h,
priv->vexpand_set ? &ignored : &v);
}
}
priv->need_compute_expand = FALSE;
priv->computed_hexpand = h != FALSE;
priv->computed_vexpand = v != FALSE;
}
}
void
gtk_widget_queue_compute_expand (GtkWidget *widget)
{
GtkWidget *parent;
gboolean changed_anything;
if (widget->priv->need_compute_expand)
return;
changed_anything = FALSE;
parent = widget;
while (parent != NULL)
{
if (!parent->priv->need_compute_expand)
{
parent->priv->need_compute_expand = TRUE;
changed_anything = TRUE;
}
/* Note: if we had an invariant that "if a child needs to
* compute expand, its parents also do" then we could stop going
* up when we got to a parent that already needed to
* compute. However, in general we compute expand lazily (as
* soon as we see something in a subtree that is expand, we know
* we're expanding) and so this invariant does not hold and we
* have to always walk all the way up in case some ancestor
* is not currently need_compute_expand.
*/
parent = parent->priv->parent;
}
/* recomputing expand always requires
* a relayout as well
*/
if (changed_anything)
gtk_widget_queue_resize (widget);
}
/**
* gtk_widget_compute_expand:
* @widget: the widget
* @orientation: expand direction
*
* Computes whether a container should give this widget extra space
* when possible. Containers should check this, rather than
* looking at gtk_widget_get_hexpand() or gtk_widget_get_vexpand().
*
* This function already checks whether the widget is visible, so
* visibility does not need to be checked separately. Non-visible
* widgets are not expanded.
*
* The computed expand value uses either the expand setting explicitly
* set on the widget itself, or, if none has been explicitly set,
* the widget may expand if some of its children do.
*
* Return value: whether widget tree rooted here should be expanded
*/
gboolean
gtk_widget_compute_expand (GtkWidget *widget,
GtkOrientation orientation)
{
g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
/* We never make a widget expand if not even showing. */
if (!gtk_widget_get_visible (widget))
return FALSE;
gtk_widget_update_computed_expand (widget);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
return widget->priv->computed_hexpand;
}
else
{
return widget->priv->computed_vexpand;
}
}
static void
gtk_widget_set_expand (GtkWidget *widget,
GtkOrientation orientation,
gboolean expand)
{
const char *expand_prop;
const char *expand_set_prop;
gboolean was_both;
GtkWidgetPrivate *priv;
g_return_if_fail (GTK_IS_WIDGET (widget));
priv = widget->priv;
expand = expand != FALSE;
was_both = priv->hexpand && priv->vexpand;
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
if (priv->hexpand_set &&
priv->hexpand == expand)
return;
priv->hexpand_set = TRUE;
priv->hexpand = expand;
expand_prop = "hexpand";
expand_set_prop = "hexpand-set";
}
else
{
if (priv->vexpand_set &&
priv->vexpand == expand)
return;
priv->vexpand_set = TRUE;
priv->vexpand = expand;
expand_prop = "vexpand";
expand_set_prop = "vexpand-set";
}
gtk_widget_queue_compute_expand (widget);
g_object_freeze_notify (G_OBJECT (widget));
g_object_notify (G_OBJECT (widget), expand_prop);
g_object_notify (G_OBJECT (widget), expand_set_prop);
if (was_both != (priv->hexpand && priv->vexpand))
g_object_notify (G_OBJECT (widget), "expand");
g_object_thaw_notify (G_OBJECT (widget));
}
static void
gtk_widget_set_expand_set (GtkWidget *widget,
GtkOrientation orientation,
gboolean set)
{
GtkWidgetPrivate *priv;
const char *prop;
priv = widget->priv;
set = set != FALSE;
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
if (set == priv->hexpand_set)
return;
priv->hexpand_set = set;
prop = "hexpand-set";
}
else
{
if (set == priv->vexpand_set)
return;
priv->vexpand_set = set;
prop = "vexpand-set";
}
gtk_widget_queue_compute_expand (widget);
g_object_notify (G_OBJECT (widget), prop);
}
/**
* gtk_widget_get_hexpand:
* @widget: the widget
*
* Gets whether the widget would like any available extra horizontal
* space. When a user resizes a #GtkWindow, widgets with expand=TRUE
* generally receive the extra space. For example, a list or
* scrollable area or document in your window would often be set to
* expand.
*
* Containers should use gtk_widget_compute_expand() rather than
* this function, to see whether a widget, or any of its children,
* has the expand flag set. If any child of a widget wants to
* expand, the parent may ask to expand also.
*
* This function only looks at the widget's own hexpand flag, rather
* than computing whether the entire widget tree rooted at this widget
* wants to expand.
*
* Return value: whether hexpand flag is set
*/
gboolean
gtk_widget_get_hexpand (GtkWidget *widget)
{
g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
return widget->priv->hexpand;
}
/**
* gtk_widget_set_hexpand:
* @widget: the widget
* @expand: whether to expand
*
* Sets whether the widget would like any available extra horizontal
* space. When a user resizes a #GtkWindow, widgets with expand=TRUE
* generally receive the extra space. For example, a list or
* scrollable area or document in your window would often be set to
* expand.
*
* Call this function to set the expand flag if you would like your
* widget to become larger horizontally when the window has extra
* room.
*
* By default, widgets automatically expand if any of their children
* want to expand. (To see if a widget will automatically expand given
* its current children and state, call gtk_widget_compute_expand(). A
* container can decide how the expandability of children affects the
* expansion of the container by overriding the compute_expand virtual
* method on #GtkWidget.).
*
* Setting hexpand explicitly with this function will override the
* automatic expand behavior.
*
* This function forces the widget to expand or not to expand,
* regardless of children. The override occurs because
* gtk_widget_set_hexpand() sets the hexpand-set property (see
* gtk_widget_set_hexpand_set()) which causes the widget's hexpand
* value to be used, rather than looking at children and widget state.
*/
void
gtk_widget_set_hexpand (GtkWidget *widget,
gboolean expand)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
gtk_widget_set_expand (widget, GTK_ORIENTATION_HORIZONTAL, expand);
}
/**
* gtk_widget_get_hexpand_set:
* @widget: the widget
*
* Gets whether gtk_widget_set_hexpand() has been used to
* explicitly set the expand flag on this widget.
*
* If hexpand is set, then it overrides any computed
* expand value based on child widgets. If hexpand is not
* set, then the expand value depends on whether any
* children of the widget would like to expand.
*
* There are few reasons to use this function, but it's here
* for completeness and consistency.
*
* Return value: whether hexpand has been explicitly set
*/
gboolean
gtk_widget_get_hexpand_set (GtkWidget *widget)
{
g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
return widget->priv->hexpand_set;
}
/**
* gtk_widget_set_hexpand_set:
* @widget: the widget
* @set: value for hexpand-set property
*
* Sets whether the hexpand flag (see gtk_widget_get_hexpand()) will
* be used.
*
* The hexpand-set property will be set automatically when you call
* gtk_widget_set_hexpand() to set hexpand, so the most likely
* reason to use this function would be to unset an explicit expand
* flag.
*
* If hexpand is set, then it overrides any computed
* expand value based on child widgets. If hexpand is not
* set, then the expand value depends on whether any
* children of the widget would like to expand.
*
* There are few reasons to use this function, but it's here
* for completeness and consistency.
*
* Return value: whether hexpand has been explicitly set
*/
void
gtk_widget_set_hexpand_set (GtkWidget *widget,
gboolean set)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
gtk_widget_set_expand_set (widget, GTK_ORIENTATION_HORIZONTAL, set);
}
/**
* gtk_widget_get_vexpand:
* @widget: the widget
*
* Gets whether the widget would like any available extra vertical
* space.
*
* See gtk_widget_get_hexpand() for more detail.
*
* Return value: whether vexpand flag is set
*/
gboolean
gtk_widget_get_vexpand (GtkWidget *widget)
{
g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
return widget->priv->vexpand;
}
/**
* gtk_widget_set_vexpand:
* @widget: the widget
* @expand: whether to expand
*
* Sets whether the widget would like any available extra vertical
* space.
*
* See gtk_widget_set_hexpand() for more detail.
*/
void
gtk_widget_set_vexpand (GtkWidget *widget,
gboolean expand)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
gtk_widget_set_expand (widget, GTK_ORIENTATION_VERTICAL, expand);
}
/**
* gtk_widget_get_vexpand_set:
* @widget: the widget
*
* Gets whether gtk_widget_set_vexpand() has been used to
* explicitly set the expand flag on this widget.
*
* See gtk_widget_get_hexpand_set() for more detail.
*
* Return value: whether vexpand has been explicitly set
*/
gboolean
gtk_widget_get_vexpand_set (GtkWidget *widget)
{
g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
return widget->priv->vexpand_set;
}
/**
* gtk_widget_set_vexpand_set:
* @widget: the widget
* @set: value for vexpand-set property
*
* Sets whether the vexpand flag (see gtk_widget_get_vexpand()) will
* be used.
*
* See gtk_widget_set_hexpand_set() for more detail.
*
* Return value: whether vexpand has been explicitly set
*/
void
gtk_widget_set_vexpand_set (GtkWidget *widget,
gboolean set)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
gtk_widget_set_expand_set (widget, GTK_ORIENTATION_VERTICAL, set);
}
/*
* GtkBuildable implementation
*/

24
gtk/gtkwidget.h
View File

@ -366,6 +366,11 @@ struct _GtkWidgetClass
gboolean keyboard_tooltip,
GtkTooltip *tooltip);
/*< public >*/
void (* compute_expand) (GtkWidget *widget,
gboolean *hexpand_p,
gboolean *vexpand_p);
void (* adjust_size_request) (GtkWidget *widget,
GtkOrientation orientation,
gint for_size,
@ -642,6 +647,25 @@ GtkSettings* gtk_widget_get_settings (GtkWidget *widget);
GtkClipboard *gtk_widget_get_clipboard (GtkWidget *widget,
GdkAtom selection);
/* Expand flags and related support */
gboolean gtk_widget_get_hexpand (GtkWidget *widget);
void gtk_widget_set_hexpand (GtkWidget *widget,
gboolean expand);
gboolean gtk_widget_get_hexpand_set (GtkWidget *widget);
void gtk_widget_set_hexpand_set (GtkWidget *widget,
gboolean set);
gboolean gtk_widget_get_vexpand (GtkWidget *widget);
void gtk_widget_set_vexpand (GtkWidget *widget,
gboolean expand);
gboolean gtk_widget_get_vexpand_set (GtkWidget *widget);
void gtk_widget_set_vexpand_set (GtkWidget *widget,
gboolean set);
void gtk_widget_queue_compute_expand (GtkWidget *widget);
gboolean gtk_widget_compute_expand (GtkWidget *widget,
GtkOrientation orientation);
/* Multidevice support */
gboolean gtk_widget_get_support_multidevice (GtkWidget *widget);
void gtk_widget_set_support_multidevice (GtkWidget *widget,