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[gtk/wip/otte/listview: 48/155] gtk: Add a GtkGridView skeleton

commit d9d2b7ff086716bbb08dcfa4fbb65609f50d37c9
Author: Benjamin Otte <otte redhat com>
Date:   Sun Jan 27 20:15:23 2019 +0100

    gtk: Add a GtkGridView skeleton

 docs/reference/gtk/gtk4-docs.xml     |   1 +
 docs/reference/gtk/gtk4-sections.txt |  18 +++
 docs/reference/gtk/gtk4.types.in     |   1 +
 gtk/gtk.h                            |   1 +
 gtk/gtkgridview.c                    | 260 +++++++++++++++++++++++++++++++++++
 gtk/gtkgridview.h                    |  48 +++++++
 gtk/meson.build                      |   2 +
 7 files changed, 331 insertions(+)
---
diff --git a/docs/reference/gtk/gtk4-docs.xml b/docs/reference/gtk/gtk4-docs.xml
index ba1325fd192..55170a1ff2f 100644
--- a/docs/reference/gtk/gtk4-docs.xml
+++ b/docs/reference/gtk/gtk4-docs.xml
@@ -109,6 +109,7 @@
       <xi:include href="xml/gtklistbox.xml" />
       <xi:include href="xml/gtkflowbox.xml" />
       <xi:include href="xml/gtklistview.xml" />
+      <xi:include href="xml/gtkgridview.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 fa3c03c5abc..5fb26081089 100644
--- a/docs/reference/gtk/gtk4-sections.txt
+++ b/docs/reference/gtk/gtk4-sections.txt
@@ -545,6 +545,24 @@ GTK_TYPE_LIST_VIEW
 gtk_list_view_get_type
 </SECTION>
 
+<SECTION>
+<FILE>gtkgridview</FILE>
+<TITLE>GtkGridView</TITLE>
+GtkGridView
+gtk_grid_view_new
+gtk_grid_view_set_model
+gtk_grid_view_get_model
+<SUBSECTION Standard>
+GTK_GRID_VIEW
+GTK_GRID_VIEW_CLASS
+GTK_GRID_VIEW_GET_CLASS
+GTK_IS_GRID_VIEW
+GTK_IS_GRID_VIEW_CLASS
+GTK_TYPE_GRID_VIEW
+<SUBSECTION Private>
+gtk_grid_view_get_type
+</SECTION>
+
 <SECTION>
 <FILE>gtkbuildable</FILE>
 GtkBuildable
diff --git a/docs/reference/gtk/gtk4.types.in b/docs/reference/gtk/gtk4.types.in
index f17ef61afed..2a34d2b4331 100644
--- a/docs/reference/gtk/gtk4.types.in
+++ b/docs/reference/gtk/gtk4.types.in
@@ -107,6 +107,7 @@ gtk_gl_area_get_type
 gtk_grid_get_type
 gtk_grid_layout_child_get_type
 gtk_grid_layout_get_type
+gtk_grid_view_get_type
 gtk_header_bar_get_type
 gtk_icon_theme_get_type
 gtk_icon_view_get_type
diff --git a/gtk/gtk.h b/gtk/gtk.h
index d66d658d892..88449f9e614 100644
--- a/gtk/gtk.h
+++ b/gtk/gtk.h
@@ -139,6 +139,7 @@
 #include <gtk/gtkglarea.h>
 #include <gtk/gtkgrid.h>
 #include <gtk/gtkgridlayout.h>
+#include <gtk/gtkgridview.h>
 #include <gtk/gtkheaderbar.h>
 #include <gtk/gtkicontheme.h>
 #include <gtk/gtkiconview.h>
diff --git a/gtk/gtkgridview.c b/gtk/gtkgridview.c
new file mode 100644
index 00000000000..9c37c6eefb1
--- /dev/null
+++ b/gtk/gtkgridview.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 "gtkgridview.h"
+
+#include "gtkintl.h"
+#include "gtkprivate.h"
+
+/**
+ * SECTION:gtkgridview
+ * @title: GtkGridView
+ * @short_description: A widget for displaying lists in a grid
+ * @see_also: #GListModel
+ *
+ * GtkGridView is a widget to present a view into a large dynamic list of items.
+ */
+
+struct _GtkGridView
+{
+  GtkWidget parent_instance;
+
+  GListModel *model;
+};
+
+enum
+{
+  PROP_0,
+  PROP_MODEL,
+
+  N_PROPS
+};
+
+G_DEFINE_TYPE (GtkGridView, gtk_grid_view, GTK_TYPE_WIDGET)
+
+static GParamSpec *properties[N_PROPS] = { NULL, };
+
+static gboolean
+gtk_grid_view_is_empty (GtkGridView *self)
+{
+  return self->model == NULL;
+}
+
+static void
+gtk_grid_view_measure (GtkWidget      *widget,
+                       GtkOrientation  orientation,
+                       int             for_size,
+                       int            *minimum,
+                       int            *natural,
+                       int            *minimum_baseline,
+                       int            *natural_baseline)
+{
+  GtkGridView *self = GTK_GRID_VIEW (widget);
+
+  if (gtk_grid_view_is_empty (self))
+    {
+      *minimum = 0;
+      *natural = 0;
+      return;
+    }
+
+  *minimum = 0;
+  *natural = 0;
+  return;
+}
+
+static void
+gtk_grid_view_size_allocate (GtkWidget *widget,
+                             int        width,
+                             int        height,
+                             int        baseline)
+{
+  //GtkGridView *self = GTK_GRID_VIEW (widget);
+}
+
+static void
+gtk_grid_view_model_items_changed_cb (GListModel  *model,
+                                      guint        position,
+                                      guint        removed,
+                                      guint        added,
+                                      GtkGridView *self)
+{
+}
+
+static void
+gtk_grid_view_clear_model (GtkGridView *self)
+{
+  if (self->model == NULL)
+    return;
+
+  g_signal_handlers_disconnect_by_func (self->model, gtk_grid_view_model_items_changed_cb, self);
+  g_clear_object (&self->model);
+}
+
+static void
+gtk_grid_view_dispose (GObject *object)
+{
+  GtkGridView *self = GTK_GRID_VIEW (object);
+
+  gtk_grid_view_clear_model (self);
+
+  G_OBJECT_CLASS (gtk_grid_view_parent_class)->dispose (object);
+}
+
+static void
+gtk_grid_view_get_property (GObject    *object,
+                            guint       property_id,
+                            GValue     *value,
+                            GParamSpec *pspec)
+{
+  GtkGridView *self = GTK_GRID_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_grid_view_set_property (GObject      *object,
+                            guint         property_id,
+                            const GValue *value,
+                            GParamSpec   *pspec)
+{
+  GtkGridView *self = GTK_GRID_VIEW (object);
+
+  switch (property_id)
+    {
+    case PROP_MODEL:
+      gtk_grid_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_grid_view_class_init (GtkGridViewClass *klass)
+{
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+
+  widget_class->measure = gtk_grid_view_measure;
+  widget_class->size_allocate = gtk_grid_view_size_allocate;
+
+  gobject_class->dispose = gtk_grid_view_dispose;
+  gobject_class->get_property = gtk_grid_view_get_property;
+  gobject_class->set_property = gtk_grid_view_set_property;
+
+  /**
+   * GtkGridView: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_grid_view_init (GtkGridView *self)
+{
+}
+
+/**
+ * gtk_grid_view_new:
+ *
+ * Creates a new empty #GtkGridView.
+ *
+ * You most likely want to call gtk_grid_view_set_model() to set
+ * a model and then set up a way to map its items to widgets next.
+ *
+ * Returns: a new #GtkGridView
+ **/
+GtkWidget *
+gtk_grid_view_new (void)
+{
+  return g_object_new (GTK_TYPE_GRID_VIEW, NULL);
+}
+
+/**
+ * gtk_grid_view_get_model:
+ * @self: a #GtkGridView
+ *
+ * Gets the model that's currently used to read the items displayed.
+ *
+ * Returns: (nullable) (transfer none): The model in use
+ **/
+GListModel *
+gtk_grid_view_get_model (GtkGridView *self)
+{
+  g_return_val_if_fail (GTK_IS_GRID_VIEW (self), NULL);
+
+  return self->model;
+}
+
+/**
+ * gtk_grid_view_set_model:
+ * @self: a #GtkGridView
+ * @model: (allow-none) (transfer none): the model to use or %NULL for none
+ *
+ * Sets the #GListModel to use for
+ **/
+void
+gtk_grid_view_set_model (GtkGridView *self,
+                         GListModel  *model)
+{
+  g_return_if_fail (GTK_IS_GRID_VIEW (self));
+  g_return_if_fail (model == NULL || G_IS_LIST_MODEL (model));
+
+  if (self->model == model)
+    return;
+
+  gtk_grid_view_clear_model (self);
+
+  if (model)
+    {
+      self->model = g_object_ref (model);
+
+      g_signal_connect (model,
+                        "items-changed", 
+                        G_CALLBACK (gtk_grid_view_model_items_changed_cb),
+                        self);
+    }
+
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MODEL]);
+}
+
diff --git a/gtk/gtkgridview.h b/gtk/gtkgridview.h
new file mode 100644
index 00000000000..0462c960ce6
--- /dev/null
+++ b/gtk/gtkgridview.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_GRID_VIEW_H__
+#define __GTK_GRID_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_GRID_VIEW         (gtk_grid_view_get_type ())
+
+GDK_AVAILABLE_IN_ALL
+G_DECLARE_FINAL_TYPE (GtkGridView, gtk_grid_view, GTK, GRID_VIEW, GtkWidget)
+
+GDK_AVAILABLE_IN_ALL
+GtkWidget *     gtk_grid_view_new                               (void);
+
+GDK_AVAILABLE_IN_ALL
+GListModel *    gtk_grid_view_get_model                         (GtkGridView            *self);
+GDK_AVAILABLE_IN_ALL
+void            gtk_grid_view_set_model                         (GtkGridView            *self,
+                                                                 GListModel             *model);
+
+
+G_END_DECLS
+
+#endif  /* __GTK_GRID_VIEW_H__ */
diff --git a/gtk/meson.build b/gtk/meson.build
index faf6df82d37..06b1b2808ec 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -259,6 +259,7 @@ gtk_public_sources = files([
   'gtkglarea.c',
   'gtkgrid.c',
   'gtkgridlayout.c',
+  'gtkgridview.c',
   'gtkheaderbar.c',
   'gtkicontheme.c',
   'gtkiconview.c',
@@ -529,6 +530,7 @@ gtk_public_headers = files([
   'gtkglarea.h',
   'gtkgrid.h',
   'gtkgridlayout.h',
+  'gtkgridview.h',
   'gtkheaderbar.h',
   'gtkicontheme.h',
   'gtkiconview.h',
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