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/* SPDX-FileCopyrightText: 2022 - Sébastien Wilmet <swilmet@gnome.org>
* SPDX-License-Identifier: LGPL-3.0-or-later
*/
#include "tepl-stack-helper.h"
#include "tepl-signal-group.h"
/*
* #TeplStackHelper adds convenience API to #GtkStack.
*/
/* Another nice benefit is that unit tests can be written. For a #GtkStack
* switcher widget, only interactive tests are possible.
*/
struct _TeplStackHelperPrivate
{
TeplSignalGroup *stack_signal_group;
};
enum
{
SIGNAL_CHANGED,
N_SIGNALS
};
static guint signals[N_SIGNALS];
G_DEFINE_TYPE_WITH_PRIVATE (TeplStackHelper, _tepl_stack_helper, G_TYPE_OBJECT)
static void
_tepl_stack_helper_dispose (GObject *object)
{
TeplStackHelper *helper = TEPL_STACK_HELPER (object);
tepl_signal_group_clear (&helper->priv->stack_signal_group);
G_OBJECT_CLASS (_tepl_stack_helper_parent_class)->dispose (object);
}
static void
_tepl_stack_helper_class_init (TeplStackHelperClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = _tepl_stack_helper_dispose;
/*
* TeplStackHelper::changed:
* @helper: the #TeplStackHelper emitting the signal.
*
* ::changed is a convenience signal that is emitted whenever the
* content of a #GtkStack switcher potentially needs to be re-created.
*
* There are two possible approaches to implement a #GtkStack switcher:
* 1. Listen to this signal and re-create each time the whole content of
* the switcher.
* 2. Don't use this class, and listen instead to the individual
* finer-grained signals (listed below) and update the minimum of the
* switcher content. This approach is more difficult (and
* error-prone), but has normally better performances.
*
* This signal is emitted on these finer-grained signals:
* - #GtkContainer::add
* - #GtkContainer::remove
* - #GObject::notify for the #GtkStack:visible-child property.
* - For all children part of the container:
* - #GtkWidget::child-notify
* - #GObject::notify for the #GtkWidget:visible property.
*/
signals[SIGNAL_CHANGED] =
g_signal_new ("changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
0, NULL, NULL, NULL,
G_TYPE_NONE, 0);
}
static void
_tepl_stack_helper_init (TeplStackHelper *helper)
{
helper->priv = _tepl_stack_helper_get_instance_private (helper);
}
static void
emit_changed (TeplStackHelper *helper)
{
g_signal_emit (helper, signals[SIGNAL_CHANGED], 0);
}
static void
child_notify_cb (GtkWidget *stack_child,
GParamSpec *child_property,
TeplStackHelper *helper)
{
emit_changed (helper);
}
static void
visible_notify_cb (GtkWidget *stack_child,
GParamSpec *pspec,
TeplStackHelper *helper)
{
emit_changed (helper);
}
static void
connect_child (TeplStackHelper *helper,
GtkWidget *stack_child)
{
g_signal_connect (stack_child,
"child-notify",
G_CALLBACK (child_notify_cb),
helper);
g_signal_connect (stack_child,
"notify::visible",
G_CALLBACK (visible_notify_cb),
helper);
}
static void
disconnect_child (TeplStackHelper *helper,
GtkWidget *stack_child)
{
g_signal_handlers_disconnect_by_func (stack_child, child_notify_cb, helper);
g_signal_handlers_disconnect_by_func (stack_child, visible_notify_cb, helper);
}
static void
connect_all_children (TeplStackHelper *helper,
GtkStack *stack)
{
GList *children;
GList *l;
children = gtk_container_get_children (GTK_CONTAINER (stack));
for (l = children; l != NULL; l = l->next)
{
GtkWidget *stack_child = GTK_WIDGET (l->data);
connect_child (helper, stack_child);
}
g_list_free (children);
}
static void
add_cb (GtkStack *stack,
GtkWidget *stack_child,
TeplStackHelper *helper)
{
connect_child (helper, stack_child);
emit_changed (helper);
}
static void
remove_cb (GtkStack *stack,
GtkWidget *stack_child,
TeplStackHelper *helper)
{
disconnect_child (helper, stack_child);
emit_changed (helper);
}
static void
visible_child_notify_cb (GtkStack *stack,
GParamSpec *pspec,
TeplStackHelper *helper)
{
emit_changed (helper);
}
/* Doesn't hold a reference to @stack. */
TeplStackHelper *
_tepl_stack_helper_new (GtkStack *stack)
{
TeplStackHelper *helper;
g_return_val_if_fail (GTK_IS_STACK (stack), NULL);
/* In an ideal world, a :stack construct-only property should be added
* instead of doing the work in new().
*/
helper = g_object_new (TEPL_TYPE_STACK_HELPER, NULL);
connect_all_children (helper, stack);
helper->priv->stack_signal_group = tepl_signal_group_new (G_OBJECT (stack));
tepl_signal_group_add (helper->priv->stack_signal_group,
g_signal_connect (stack,
"add",
G_CALLBACK (add_cb),
helper));
tepl_signal_group_add (helper->priv->stack_signal_group,
g_signal_connect (stack,
"remove",
G_CALLBACK (remove_cb),
helper));
tepl_signal_group_add (helper->priv->stack_signal_group,
g_signal_connect (stack,
"notify::visible-child",
G_CALLBACK (visible_child_notify_cb),
helper));
return helper;
}
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