[gtk/wip/otte/listview: 302/327] gtk: Add a GtkListView skeleton

[Benjamin Otte <otte src gnome org>]

commit 3485a4582cedf4bce0b1f68ecaf4459450d5b37b
Author: Benjamin Otte <otte redhat com>
Date:   Sun Sep 16 20:52:06 2018 +0200

    gtk: Add a GtkListView skeleton

 docs/reference/gtk/gtk4-docs.xml     |   1 +
 docs/reference/gtk/gtk4-sections.txt |  18 +++
 gtk/gtk.h                            |   1 +
 gtk/gtklistview.c                    | 260 +++++++++++++++++++++++++++++++++++
 gtk/gtklistview.h                    |  48 +++++++
 gtk/meson.build                      |   2 +
 6 files changed, 330 insertions(+)
---
diff --git a/docs/reference/gtk/gtk4-docs.xml b/docs/reference/gtk/gtk4-docs.xml
index a07512291e..b6fbcc5ecb 100644
--- a/docs/reference/gtk/gtk4-docs.xml
+++ b/docs/reference/gtk/gtk4-docs.xml
@@ -83,6 +83,7 @@
       <xi:include href="xml/gtkrevealer.xml" />
       <xi:include href="xml/gtklistbox.xml" />
       <xi:include href="xml/gtkflowbox.xml" />
+      <xi:include href="xml/gtklistview.xml" />
       <xi:include href="xml/gtkstack.xml" />
       <xi:include href="xml/gtkstackswitcher.xml" />
       <xi:include href="xml/gtkstacksidebar.xml" />
diff --git a/docs/reference/gtk/gtk4-sections.txt b/docs/reference/gtk/gtk4-sections.txt
index 2e24ff6f3d..05f42cc711 100644
--- a/docs/reference/gtk/gtk4-sections.txt
+++ b/docs/reference/gtk/gtk4-sections.txt
@@ -442,6 +442,24 @@ gtk_list_box_get_type
 gtk_list_box_row_get_type
 </SECTION>
 
+<SECTION>
+<FILE>gtklistview</FILE>
+<TITLE>GtkListView</TITLE>
+GtkListView
+gtk_list_view_new
+gtk_list_view_set_model
+gtk_list_view_get_model
+<SUBSECTION Standard>
+GTK_LIST_VIEW
+GTK_LIST_VIEW_CLASS
+GTK_LIST_VIEW_GET_CLASS
+GTK_IS_LIST_VIEW
+GTK_IS_LIST_VIEW_CLASS
+GTK_TYPE_LIST_VIEW
+<SUBSECTION Private>
+gtk_list_view_get_type
+</SECTION>
+
 <SECTION>
 <FILE>gtkbuildable</FILE>
 GtkBuildable
diff --git a/gtk/gtk.h b/gtk/gtk.h
index cf89eca9ab..27508d7688 100644
--- a/gtk/gtk.h
+++ b/gtk/gtk.h
@@ -140,6 +140,7 @@
 #include <gtk/gtklinkbutton.h>
 #include <gtk/gtklistbox.h>
 #include <gtk/gtkliststore.h>
+#include <gtk/gtklistview.h>
 #include <gtk/gtklockbutton.h>
 #include <gtk/gtkmain.h>
 #include <gtk/gtkmaplistmodel.h>
diff --git a/gtk/gtklistview.c b/gtk/gtklistview.c
new file mode 100644
index 0000000000..a4d8f1ad83
--- /dev/null
+++ b/gtk/gtklistview.c
@@ -0,0 +1,260 @@
+/*
+ * 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 "gtklistview.h"
+
+#include "gtkintl.h"
+#include "gtkprivate.h"
+
+/**
+ * SECTION:gtklistview
+ * @title: GtkListView
+ * @short_description: A widget for displaying lists
+ * @see_also: #GListModel
+ *
+ * GtkListView is a widget to present a view into a large dynamic list of items.
+ */
+
+struct _GtkListView
+{
+  GtkWidget parent_instance;
+
+  GListModel *model;
+};
+
+enum
+{
+  PROP_0,
+  PROP_MODEL,
+
+  N_PROPS
+};
+
+G_DEFINE_TYPE (GtkListView, gtk_list_view, GTK_TYPE_WIDGET)
+
+static GParamSpec *properties[N_PROPS] = { NULL, };
+
+static gboolean
+gtk_list_view_is_empty (GtkListView *self)
+{
+  return self->model == NULL;
+}
+
+static void
+gtk_list_view_measure (GtkWidget      *widget,
+                       GtkOrientation  orientation,
+                       int             for_size,
+                       int            *minimum,
+                       int            *natural,
+                       int            *minimum_baseline,
+                       int            *natural_baseline)
+{
+  GtkListView *self = GTK_LIST_VIEW (widget);
+
+  if (gtk_list_view_is_empty (self))
+    {
+      *minimum = 0;
+      *natural = 0;
+      return;
+    }
+
+  *minimum = 0;
+  *natural = 0;
+  return;
+}
+
+static void
+gtk_list_view_size_allocate (GtkWidget           *widget,
+                             const GtkAllocation *allocation,
+                             int                  baseline)
+{
+  //GtkListView *self = GTK_LIST_VIEW (widget);
+}
+
+static void
+gtk_list_view_model_items_changed_cb (GListModel  *model,
+                                      guint        position,
+                                      guint        removed,
+                                      guint        added,
+                                      GtkListView *self)
+{
+}
+
+static void
+gtk_list_view_clear_model (GtkListView *self)
+{
+  if (self->model == NULL)
+    return;
+
+  g_signal_handlers_disconnect_by_func (self->model, gtk_list_view_model_items_changed_cb, self);
+  g_clear_object (&self->model);
+}
+
+static void
+gtk_list_view_dispose (GObject *object)
+{
+  GtkListView *self = GTK_LIST_VIEW (object);
+
+  gtk_list_view_clear_model (self);
+
+  G_OBJECT_CLASS (gtk_list_view_parent_class)->dispose (object);
+}
+
+static void
+gtk_list_view_get_property (GObject    *object,
+                            guint       property_id,
+                            GValue     *value,
+                            GParamSpec *pspec)
+{
+  GtkListView *self = GTK_LIST_VIEW (object);
+
+  switch (property_id)
+    {
+    case PROP_MODEL:
+      g_value_set_object (value, self->model);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gtk_list_view_set_property (GObject      *object,
+                            guint         property_id,
+                            const GValue *value,
+                            GParamSpec   *pspec)
+{
+  GtkListView *self = GTK_LIST_VIEW (object);
+
+  switch (property_id)
+    {
+    case PROP_MODEL:
+      gtk_list_view_set_model (self, g_value_get_object (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gtk_list_view_class_init (GtkListViewClass *klass)
+{
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+
+  widget_class->measure = gtk_list_view_measure;
+  widget_class->size_allocate = gtk_list_view_size_allocate;
+
+  gobject_class->dispose = gtk_list_view_dispose;
+  gobject_class->get_property = gtk_list_view_get_property;
+  gobject_class->set_property = gtk_list_view_set_property;
+
+  /**
+   * GtkListView:model:
+   *
+   * Model for the items displayed
+   */
+  properties[PROP_MODEL] =
+    g_param_spec_object ("model",
+                         P_("Model"),
+                         P_("Model for the items displayed"),
+                         G_TYPE_LIST_MODEL,
+                         G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
+
+  g_object_class_install_properties (gobject_class, N_PROPS, properties);
+
+  gtk_widget_class_set_css_name (widget_class, I_("list"));
+}
+
+static void
+gtk_list_view_init (GtkListView *self)
+{
+  gtk_widget_set_has_surface (GTK_WIDGET (self), FALSE);
+}
+
+/**
+ * gtk_list_view_new:
+ *
+ * Creates a new empty #GtkListView.
+ *
+ * You most likely want to call gtk_list_view_set_model() to set
+ * a model and then set up a way to map its items to widgets next.
+ *
+ * Returns: a new #GtkListView
+ **/
+GtkWidget *
+gtk_list_view_new (void)
+{
+  return g_object_new (GTK_TYPE_LIST_VIEW, NULL);
+}
+
+/**
+ * gtk_list_view_get_model:
+ * @self: a #GtkListView
+ *
+ * Gets the model that's currently used to read the items displayed.
+ *
+ * Returns: (nullable) (transfer none): The model in use
+ **/
+GListModel *
+gtk_list_view_get_model (GtkListView *self)
+{
+  g_return_val_if_fail (GTK_IS_LIST_VIEW (self), NULL);
+
+  return self->model;
+}
+
+/**
+ * gtk_list_view_set_model:
+ * @self: a #GtkListView
+ * @file: (allow-none) (transfer none): the model to use or %NULL for none
+ *
+ * Sets the #GListModel to use for
+ **/
+void
+gtk_list_view_set_model (GtkListView *self,
+                         GListModel  *model)
+{
+  g_return_if_fail (GTK_IS_LIST_VIEW (self));
+  g_return_if_fail (model == NULL || G_IS_LIST_MODEL (model));
+
+  if (self->model == model)
+    return;
+
+  gtk_list_view_clear_model (self);
+
+  if (model)
+    {
+      self->model = g_object_ref (model);
+
+      g_signal_connect (model,
+                        "items-changed", 
+                        G_CALLBACK (gtk_list_view_model_items_changed_cb),
+                        self);
+    }
+
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MODEL]);
+}
+
diff --git a/gtk/gtklistview.h b/gtk/gtklistview.h
new file mode 100644
index 0000000000..9329e21d75
--- /dev/null
+++ b/gtk/gtklistview.h
@@ -0,0 +1,48 @@
+/*
+ * 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_VIEW_H__
+#define __GTK_LIST_VIEW_H__
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gtk/gtkwidget.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_LIST_VIEW         (gtk_list_view_get_type ())
+
+GDK_AVAILABLE_IN_ALL
+G_DECLARE_FINAL_TYPE (GtkListView, gtk_list_view, GTK, LIST_VIEW, GtkWidget)
+
+GDK_AVAILABLE_IN_ALL
+GtkWidget *     gtk_list_view_new                               (void);
+
+GDK_AVAILABLE_IN_ALL
+GListModel *    gtk_list_view_get_model                         (GtkListView            *self);
+GDK_AVAILABLE_IN_ALL
+void            gtk_list_view_set_model                         (GtkListView            *self,
+                                                                 GListModel             *model);
+
+
+G_END_DECLS
+
+#endif  /* __GTK_LIST_VIEW_H__ */
diff --git a/gtk/meson.build b/gtk/meson.build
index cc021d7fea..0c4122d110 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -268,6 +268,7 @@ gtk_public_sources = files([
   'gtklistbox.c',
   'gtklistlistmodel.c',
   'gtkliststore.c',
+  'gtklistview.c',
   'gtklockbutton.c',
   'gtkmain.c',
   'gtkmaplistmodel.c',
@@ -514,6 +515,7 @@ gtk_public_headers = files([
   'gtklinkbutton.h',
   'gtklistbox.h',
   'gtkliststore.h',
+  'gtklistview.h',
   'gtklockbutton.h',
   'gtkmain.h',
   'gtkmaplistmodel.h',