[gtk/wip/otte/listview: 2/3] listview: Introduce GtkListItemFactory

[Benjamin Otte <otte src gnome org>]

commit ee08eda38232c4181eb9188a82231d6beb69c8f4
Author: Benjamin Otte <otte redhat com>
Date:   Mon Sep 17 07:29:50 2018 +0200

    listview: Introduce GtkListItemFactory
    
    Thisis the abstraction I intend to use for creating widgets and binding
    them to the item out of the listview.
    
    For now this is a very dumb wrapper around the functions that exist in
    the API.
    
    But it leaves the freedom to turn this into public API, make an
    interface out of it and most of all write different implementations, in
    particular one that uses GtkBuilder.

 gtk/gtklistitemfactory.c        | 105 ++++++++++++++++++++++++++++++++++++++++
 gtk/gtklistitemfactoryprivate.h |  54 +++++++++++++++++++++
 gtk/gtklistview.c               |  22 ++++++++-
 gtk/gtklistview.h               |  37 +++++++++++++-
 gtk/meson.build                 |   1 +
 5 files changed, 217 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtklistitemfactory.c b/gtk/gtklistitemfactory.c
new file mode 100644
index 0000000000..cc69210aeb
--- /dev/null
+++ b/gtk/gtklistitemfactory.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright © 2018 Benjamin Otte
+ *
+ * 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 2.1 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/>.
+ *
+ * Authors: Benjamin Otte <otte gnome org>
+ */
+
+#include "config.h"
+
+#include "gtklistitemfactoryprivate.h"
+
+struct _GtkListItemFactory
+{
+  GObject parent_instance;
+
+  GtkListCreateWidgetFunc create_func;
+  GtkListBindWidgetFunc bind_func;
+  gpointer user_data;
+  GDestroyNotify user_destroy;
+};
+
+struct _GtkListItemFactoryClass
+{
+  GObjectClass parent_class;
+};
+
+G_DEFINE_TYPE (GtkListItemFactory, gtk_list_item_factory, G_TYPE_OBJECT)
+
+static void
+gtk_list_item_factory_finalize (GObject *object)
+{
+  GtkListItemFactory *self = GTK_LIST_ITEM_FACTORY (object);
+
+  if (self->user_destroy)
+    self->user_destroy (self->user_data);
+
+  G_OBJECT_CLASS (gtk_list_item_factory_parent_class)->finalize (object);
+}
+
+static void
+gtk_list_item_factory_class_init (GtkListItemFactoryClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->finalize = gtk_list_item_factory_finalize;
+}
+
+static void
+gtk_list_item_factory_init (GtkListItemFactory *self)
+{
+}
+
+GtkListItemFactory *
+gtk_list_item_factory_new (GtkListCreateWidgetFunc create_func,
+                           GtkListBindWidgetFunc   bind_func,
+                           gpointer                user_data,
+                           GDestroyNotify          user_destroy)
+{
+  GtkListItemFactory *self;
+
+  g_return_val_if_fail (create_func, NULL);
+  g_return_val_if_fail (bind_func, NULL);
+  g_return_val_if_fail (user_data != NULL || user_destroy == NULL, NULL);
+
+  self = g_object_new (GTK_TYPE_LIST_ITEM_FACTORY, NULL);
+
+  self->create_func = create_func;
+  self->bind_func = bind_func;
+  self->user_data = user_data;
+  self->user_destroy = user_destroy;
+
+  return self;
+}
+
+GtkWidget *
+gtk_list_item_factory_create (GtkListItemFactory *self)
+{
+  g_return_val_if_fail (GTK_IS_LIST_ITEM_FACTORY (self), NULL);
+
+  return self->create_func (self->user_data);
+}
+
+void
+gtk_list_item_factory_bind (GtkListItemFactory *self,
+                            GtkWidget          *widget,
+                            gpointer            item)
+{
+  g_return_if_fail (GTK_IS_LIST_ITEM_FACTORY (self));
+  g_return_if_fail (GTK_IS_WIDGET (widget));
+
+  self->bind_func (widget, item, self->user_data);
+}
+
diff --git a/gtk/gtklistitemfactoryprivate.h b/gtk/gtklistitemfactoryprivate.h
new file mode 100644
index 0000000000..28ae55b4aa
--- /dev/null
+++ b/gtk/gtklistitemfactoryprivate.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright © 2018 Benjamin Otte
+ *
+ * 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 2.1 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/>.
+ *
+ * Authors: Benjamin Otte <otte gnome org>
+ */
+
+
+#ifndef __GTK_LIST_ITEM_FACTORY_H__
+#define __GTK_LIST_ITEM_FACTORY_H__
+
+#include <gtk/gtklistview.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_LIST_ITEM_FACTORY         (gtk_list_item_factory_get_type ())
+#define GTK_LIST_ITEM_FACTORY(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_LIST_ITEM_FACTORY, 
GtkListItemFactory))
+#define GTK_LIST_ITEM_FACTORY_CLASS(k)     (G_TYPE_CHECK_CLASS_CAST ((k), GTK_TYPE_LIST_ITEM_FACTORY, 
GtkListItemFactoryClass))
+#define GTK_IS_LIST_ITEM_FACTORY(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), GTK_TYPE_LIST_ITEM_FACTORY))
+#define GTK_IS_LIST_ITEM_FACTORY_CLASS(k)  (G_TYPE_CHECK_CLASS_TYPE ((k), GTK_TYPE_LIST_ITEM_FACTORY))
+#define GTK_LIST_ITEM_FACTORY_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), GTK_TYPE_LIST_ITEM_FACTORY, 
GtkListItemFactoryClass))
+
+typedef struct _GtkListItemFactory GtkListItemFactory;
+typedef struct _GtkListItemFactoryClass GtkListItemFactoryClass;
+
+GType                   gtk_list_item_factory_get_type          (void) G_GNUC_CONST;
+
+GtkListItemFactory *    gtk_list_item_factory_new               (GtkListCreateWidgetFunc create_func,
+                                                                 GtkListBindWidgetFunc   bind_func,
+                                                                 gpointer                user_data,
+                                                                 GDestroyNotify          user_destroy);
+
+GtkWidget *             gtk_list_item_factory_create            (GtkListItemFactory     *self);
+
+void                    gtk_list_item_factory_bind              (GtkListItemFactory     *self,
+                                                                 GtkWidget              *widget,
+                                                                 gpointer                item);
+
+
+G_END_DECLS
+
+#endif /* __GTK_LIST_ITEM_FACTORY_H__ */
diff --git a/gtk/gtklistview.c b/gtk/gtklistview.c
index a4d8f1ad83..648711d987 100644
--- a/gtk/gtklistview.c
+++ b/gtk/gtklistview.c
@@ -22,7 +22,7 @@
 #include "gtklistview.h"
 
 #include "gtkintl.h"
-#include "gtkprivate.h"
+#include "gtklistitemfactoryprivate.h"
 
 /**
  * SECTION:gtklistview
@@ -38,6 +38,7 @@ struct _GtkListView
   GtkWidget parent_instance;
 
   GListModel *model;
+  GtkListItemFactory *item_factory;
 };
 
 enum
@@ -115,6 +116,8 @@ gtk_list_view_dispose (GObject *object)
 
   gtk_list_view_clear_model (self);
 
+  g_clear_object (&self->item_factory);
+
   G_OBJECT_CLASS (gtk_list_view_parent_class)->dispose (object);
 }
 
@@ -258,3 +261,20 @@ gtk_list_view_set_model (GtkListView *self,
   g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MODEL]);
 }
 
+void
+gtk_list_view_set_functions (GtkListView            *self,
+                             GtkListCreateWidgetFunc create_func,
+                             GtkListBindWidgetFunc   bind_func,
+                             gpointer                user_data,
+                             GDestroyNotify          user_destroy)
+{
+  g_return_if_fail (GTK_IS_LIST_VIEW (self));
+  g_return_if_fail (create_func);
+  g_return_if_fail (bind_func);
+  g_return_if_fail (user_data != NULL || user_destroy == NULL);
+
+  g_clear_object (&self->item_factory);
+
+  self->item_factory = gtk_list_item_factory_new (create_func, bind_func, user_data, user_destroy);
+}
+
diff --git a/gtk/gtklistview.h b/gtk/gtklistview.h
index 62d77dc99b..951219852a 100644
--- a/gtk/gtklistview.h
+++ b/gtk/gtklistview.h
@@ -24,6 +24,36 @@
 
 G_BEGIN_DECLS
 
+/**
+ * GtkListCreateWidgetFunc:
+ * @user_data: (closure): user data
+ *
+ * Called whenever a new widget needs to be created for managing a row in
+ * the list.
+ *
+ * The widget will later be bound to an item via the #GtkListBindWidgetFunc.
+ *
+ * Returns: (transfer full): a #GtkWidget
+ */
+typedef GtkWidget * (* GtkListCreateWidgetFunc) (gpointer user_data);
+
+/**
+ * GtkListBindWidgetFunc:
+ * @widget: The #GtkWidget to bind
+ * @item: (type GObject) (allow-none): item to bind or %NULL to unbind
+ *     the widget.
+ * @user_data: (closure): user data
+ *
+ * Binds a widget previously created via a #GtkListCreateWidgetFunc to
+ * an @item.
+ *
+ * Rebinding a @widget to different @items is supported as well as
+ * unbinding it by setting @item to %NULL.
+ */
+typedef void (* GtkListBindWidgetFunc) (GtkWidget *widget,
+                                        gpointer   item,
+                                        gpointer   user_data);
+
 #define GTK_TYPE_LIST_VIEW         (gtk_list_view_get_type ())
 
 GDK_AVAILABLE_IN_ALL
@@ -37,7 +67,12 @@ GListModel *    gtk_list_view_get_model                         (GtkListView
 GDK_AVAILABLE_IN_ALL
 void            gtk_list_view_set_model                         (GtkListView            *self,
                                                                  GListModel             *model);
-
+GDK_AVAILABLE_IN_ALL
+void            gtk_list_view_set_functions                     (GtkListView            *self,
+                                                                 GtkListCreateWidgetFunc create_func,
+                                                                 GtkListBindWidgetFunc   bind_func,
+                                                                 gpointer                user_data,
+                                                                 GDestroyNotify          user_destroy);
 
 G_END_DECLS
 
diff --git a/gtk/meson.build b/gtk/meson.build
index e0000a294c..8979c85889 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -267,6 +267,7 @@ gtk_public_sources = files([
   'gtklevelbar.c',
   'gtklinkbutton.c',
   'gtklistbox.c',
+  'gtklistitemfactory.c',
   'gtklistlistmodel.c',
   'gtkliststore.c',
   'gtklistview.c',