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[gtk/wip/otte/listview: 13/155] Add GtkMultiSorter

commit c713295dbe32f0fcf6d31d4d0e674368bcfabf1a
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Dec 8 13:54:57 2019 -0500

    Add GtkMultiSorter
    
    This is a sorter that tries multiple sorters in turn.

 docs/reference/gtk/gtk4-docs.xml     |   1 +
 docs/reference/gtk/gtk4-sections.txt |  17 ++
 docs/reference/gtk/gtk4.types.in     |   1 +
 gtk/gtk.h                            |   1 +
 gtk/gtkmultisorter.c                 | 310 +++++++++++++++++++++++++++++++++++
 gtk/gtkmultisorter.h                 |  49 ++++++
 gtk/meson.build                      |   2 +
 7 files changed, 381 insertions(+)
---
diff --git a/docs/reference/gtk/gtk4-docs.xml b/docs/reference/gtk/gtk4-docs.xml
index ed057fe19e..ab30f17937 100644
--- a/docs/reference/gtk/gtk4-docs.xml
+++ b/docs/reference/gtk/gtk4-docs.xml
@@ -60,6 +60,7 @@
         <xi:include href="xml/gtksorter.xml" />
         <xi:include href="xml/gtkcustomsorter.xml" />
         <xi:include href="xml/gtkstringsorter.xml" />
+        <xi:include href="xml/gtkmultisorter.xml" />
       </section>
       <xi:include href="xml/gtkselectionmodel.xml" />
       <xi:include href="xml/gtknoselection.xml" />
diff --git a/docs/reference/gtk/gtk4-sections.txt b/docs/reference/gtk/gtk4-sections.txt
index 6bc7493049..199bd54f4f 100644
--- a/docs/reference/gtk/gtk4-sections.txt
+++ b/docs/reference/gtk/gtk4-sections.txt
@@ -2612,6 +2612,23 @@ GTK_CUSTOM_SORTER_GET_CLASS
 gtk_custom_sorter_get_type
 </SECTION>
 
+<SECTION>
+<FILE>gtkmultisorter</FILE>
+<TITLE>GtkMultiSorter</TITLE>
+GtkMultiSorter
+gtk_multi_sorter_new
+gtk_multi_sorter_append
+gtk_multi_sorter_remove
+<SUBSECTION Standard>
+GTK_MULTI_SORTER
+GTK_IS_MULTI_SORTER
+GTK_TYPE_MULTI_SORTER
+GTK_IS_MULTI_SORTER_CLASS
+GTK_MULTI_SORTER_GET_CLASS
+<SUBSECTION Private>
+gtk_multi_sorter_get_type
+</SECTION>
+
 <SECTION>
 <FILE>gtksortlistmodel</FILE>
 <TITLE>GtkSortListModel</TITLE>
diff --git a/docs/reference/gtk/gtk4.types.in b/docs/reference/gtk/gtk4.types.in
index ccf155c50b..81e5dd9373 100644
--- a/docs/reference/gtk/gtk4.types.in
+++ b/docs/reference/gtk/gtk4.types.in
@@ -132,6 +132,7 @@ gtk_menu_tool_button_get_type
 gtk_message_dialog_get_type
 gtk_mount_operation_get_type
 gtk_multi_filter_get_type
+gtk_multi_sorter_get_type
 gtk_native_get_type
 gtk_no_selection_get_type
 gtk_notebook_get_type
diff --git a/gtk/gtk.h b/gtk/gtk.h
index 258cb84c85..2eee2c826a 100644
--- a/gtk/gtk.h
+++ b/gtk/gtk.h
@@ -165,6 +165,7 @@
 #include <gtk/gtkmessagedialog.h>
 #include <gtk/gtkmountoperation.h>
 #include <gtk/gtkmultifilter.h>
+#include <gtk/gtkmultisorter.h>
 #include <gtk/gtknative.h>
 #include <gtk/gtknativedialog.h>
 #include <gtk/gtknoselection.h>
diff --git a/gtk/gtkmultisorter.c b/gtk/gtkmultisorter.c
new file mode 100644
index 0000000000..66400c50a2
--- /dev/null
+++ b/gtk/gtkmultisorter.c
@@ -0,0 +1,310 @@
+/*
+ * Copyright © 2019 Matthias Clasen
+ *
+ * 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: Matthias Clasen <mclasen redhat com>
+ */
+
+#include "config.h"
+
+#include "gtkmultisorter.h"
+
+#include "gtkbuildable.h"
+#include "gtkintl.h"
+#include "gtktypebuiltins.h"
+
+/**
+ * SECTION:gtkmultisorter
+ * @Title: GtkMultiSorter
+ * @Short_description: Combining multiple sorters
+ *
+ * GtkMultiSorter combines multiple sorters by trying them
+ * in turn. If the first sorter compares two items as equal,
+ * the second is tried next, and so on.
+ */
+struct _GtkMultiSorter
+{
+  GtkSorter parent_instance;
+
+  GSequence *sorters;
+};
+
+static GType
+gtk_multi_sorter_get_item_type (GListModel *list)
+{
+  return GTK_TYPE_SORTER;
+}
+
+static guint
+gtk_multi_sorter_get_n_items (GListModel *list)
+{
+  GtkMultiSorter *self = GTK_MULTI_SORTER (list);
+
+  return g_sequence_get_length (self->sorters);
+}
+
+static gpointer
+gtk_multi_sorter_get_item (GListModel *list,
+                           guint       position)
+{
+  GtkMultiSorter *self = GTK_MULTI_SORTER (list);
+  GSequenceIter *iter;
+
+  iter = g_sequence_get_iter_at_pos (self->sorters, position);
+
+  if (g_sequence_iter_is_end (iter))
+    return NULL;
+  else
+    return g_object_ref (g_sequence_get (iter));
+}
+
+static void
+gtk_multi_sorter_list_model_init (GListModelInterface *iface)
+{
+  iface->get_item_type = gtk_multi_sorter_get_item_type;
+  iface->get_n_items = gtk_multi_sorter_get_n_items;
+  iface->get_item = gtk_multi_sorter_get_item;
+}
+
+static GtkBuildableIface *parent_buildable_iface;
+
+static void
+gtk_multi_sorter_buildable_add_child (GtkBuildable *buildable,
+                                      GtkBuilder   *builder,
+                                      GObject      *child,
+                                      const gchar  *type)
+{
+  if (GTK_IS_SORTER (child))
+    gtk_multi_sorter_append (GTK_MULTI_SORTER (buildable), g_object_ref (GTK_SORTER (child)));
+  else
+    parent_buildable_iface->add_child (buildable, builder, child, type);
+}
+
+static void
+gtk_multi_sorter_buildable_init (GtkBuildableIface *iface)
+{
+  parent_buildable_iface = g_type_interface_peek_parent (iface);
+
+  iface->add_child = gtk_multi_sorter_buildable_add_child;
+}
+
+G_DEFINE_TYPE_WITH_CODE (GtkMultiSorter, gtk_multi_sorter, GTK_TYPE_SORTER,
+                         G_IMPLEMENT_INTERFACE (G_TYPE_LIST_MODEL, gtk_multi_sorter_list_model_init)
+                         G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE, gtk_multi_sorter_buildable_init))
+
+static GtkOrdering
+gtk_multi_sorter_compare (GtkSorter *sorter,
+                          gpointer   item1,
+                          gpointer   item2)
+{
+  GtkMultiSorter *self = GTK_MULTI_SORTER (sorter);
+  GtkOrdering result = GTK_ORDERING_EQUAL;
+  GSequenceIter *iter;
+
+  for (iter = g_sequence_get_begin_iter (self->sorters);
+       !g_sequence_iter_is_end (iter);
+       iter = g_sequence_iter_next (iter))
+    {
+      GtkSorter *child = g_sequence_get (iter);
+
+      result = gtk_sorter_compare (child, item1, item2);
+      if (result != GTK_ORDERING_EQUAL)
+        break;
+    }
+
+  return result;
+}
+
+static GtkSorterOrder
+gtk_multi_sorter_get_order (GtkSorter *sorter)
+{
+  GtkMultiSorter *self = GTK_MULTI_SORTER (sorter);
+  GtkSorterOrder result = GTK_SORTER_ORDER_NONE;
+  GSequenceIter *iter;
+
+  for (iter = g_sequence_get_begin_iter (self->sorters);
+       !g_sequence_iter_is_end (iter);
+       iter = g_sequence_iter_next (iter))
+    {
+      GtkSorter *child = g_sequence_get (iter);
+      GtkSorterOrder child_order;
+
+      child_order = gtk_sorter_get_order (child);
+      switch (child_order)
+        {
+          case GTK_SORTER_ORDER_PARTIAL:
+            result = GTK_SORTER_ORDER_PARTIAL;
+            break;
+          case GTK_SORTER_ORDER_NONE:
+            break;
+          case GTK_SORTER_ORDER_TOTAL:
+            return GTK_SORTER_ORDER_TOTAL;
+          default:
+            g_assert_not_reached ();
+            break;
+        }
+    }
+
+  return result;
+}
+
+static void
+gtk_multi_sorter_changed_cb (GtkSorter       *sorter,
+                             GtkSorterChange  change,
+                             GtkMultiSorter  *self)
+{
+  /* Using an enum on purpose, so gcc complains about this case if
+   * new values are added to the enum */
+  switch (change)
+  {
+    case GTK_SORTER_CHANGE_INVERTED:
+      /* This could do a lot better with change handling, in particular in cases where self->n_sorters == 1
+       * or if sorter == self->sorters[0] */
+      change = GTK_SORTER_CHANGE_DIFFERENT;
+      break;
+
+    case GTK_SORTER_CHANGE_DIFFERENT:
+    case GTK_SORTER_CHANGE_LESS_STRICT:
+    case GTK_SORTER_CHANGE_MORE_STRICT:
+      break;
+
+    default:
+      g_assert_not_reached ();
+      change = GTK_SORTER_CHANGE_DIFFERENT;
+  }
+  gtk_sorter_changed (GTK_SORTER (self), change);
+}
+
+static void
+gtk_multi_sorter_remove_iter (GtkMultiSorter *self,
+                              GSequenceIter  *iter)
+{
+  GtkSorter *sorter;
+
+  sorter = g_sequence_get (iter);
+  g_signal_handlers_disconnect_by_func (sorter, gtk_multi_sorter_changed_cb, self);
+  g_object_unref (sorter);
+  g_sequence_remove (iter);
+}
+
+static void
+gtk_multi_sorter_dispose (GObject *object)
+{
+  GtkMultiSorter *self = GTK_MULTI_SORTER (object);
+
+  while (!g_sequence_is_empty (self->sorters))
+    gtk_multi_sorter_remove_iter (self, g_sequence_get_begin_iter (self->sorters));
+
+  G_OBJECT_CLASS (gtk_multi_sorter_parent_class)->dispose (object);
+}
+
+static void
+gtk_multi_sorter_finalize (GObject *object)
+{
+  GtkMultiSorter *self = GTK_MULTI_SORTER (object);
+
+  g_sequence_free (self->sorters);
+
+  G_OBJECT_CLASS (gtk_multi_sorter_parent_class)->finalize (object);
+}
+
+static void
+gtk_multi_sorter_class_init (GtkMultiSorterClass *class)
+{
+  GtkSorterClass *sorter_class = GTK_SORTER_CLASS (class);
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  sorter_class->compare = gtk_multi_sorter_compare;
+  sorter_class->get_order = gtk_multi_sorter_get_order;
+
+  object_class->dispose = gtk_multi_sorter_dispose;
+  object_class->finalize = gtk_multi_sorter_finalize;
+}
+
+static void
+gtk_multi_sorter_init (GtkMultiSorter *self)
+{
+  self->sorters = g_sequence_new (NULL);
+}
+
+/**
+ * gtk_multi_sorter_new:
+ *
+ * Creates a new multi sorter.
+ *
+ * This sorter compares items by trying each of the sorters
+ * in turn, until one returns non-zero. In particular, if
+ * no sorter has been added to it, it will always compare
+ * items as equal.
+ *
+ * Returns: a new #GtkSorter
+ */
+GtkSorter *
+gtk_multi_sorter_new (void)
+{
+  return g_object_new (GTK_TYPE_MULTI_SORTER, NULL);
+}
+
+/**
+ * gtk_multi_sorter_append:
+ * @self: a #GtkMultiSorter
+ * @sorter: (transfer full): a sorter to add
+ *
+ * Add @sorter to @self to use for sorting at the end. @self
+ * will consult all existing sorters before it will sort with
+ * the given @sorter.
+ */
+void
+gtk_multi_sorter_append (GtkMultiSorter *self,
+                         GtkSorter      *sorter)
+{
+  g_return_if_fail (GTK_IS_MULTI_SORTER (self));
+  g_return_if_fail (GTK_IS_SORTER (sorter));
+
+  g_signal_connect (sorter, "changed", G_CALLBACK (gtk_multi_sorter_changed_cb), self);
+  g_sequence_append (self->sorters, sorter);
+
+  gtk_sorter_changed (GTK_SORTER (self), GTK_SORTER_CHANGE_MORE_STRICT);
+}
+
+/**
+ * gtk_multi_sorter_remove:
+ * @self: a #GtkMultiSorter
+ * @position: position of sorter to remove
+ *
+ * Removes the sorter at the given @position from the list of sorter
+ * used by @self.
+ *
+ * If @position is larger than the number of sorters, nothing happens.
+ */
+void
+gtk_multi_sorter_remove (GtkMultiSorter *self,
+                         guint           position)
+{
+  GSequenceIter *iter;
+  guint length;
+
+  g_return_if_fail (GTK_IS_MULTI_SORTER (self));
+
+  length = g_sequence_get_length (self->sorters);
+  if (position >= length)
+    return;
+
+  iter = g_sequence_get_iter_at_pos (self->sorters, position);
+  gtk_multi_sorter_remove_iter (self, iter);
+
+  gtk_sorter_changed (GTK_SORTER (self), GTK_SORTER_CHANGE_LESS_STRICT);
+}
+
diff --git a/gtk/gtkmultisorter.h b/gtk/gtkmultisorter.h
new file mode 100644
index 0000000000..4f265bf6a2
--- /dev/null
+++ b/gtk/gtkmultisorter.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright © 2019 Matthias Clasen
+ *
+ * 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: Matthias Clasen <mclasen redhat com>
+ */
+
+#ifndef __GTK_MULTI_SORTER_H__
+#define __GTK_MULTI_SORTER_H__
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gtk/gtkexpression.h>
+#include <gtk/gtksorter.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_MULTI_SORTER             (gtk_multi_sorter_get_type ())
+GDK_AVAILABLE_IN_ALL
+G_DECLARE_FINAL_TYPE (GtkMultiSorter, gtk_multi_sorter, GTK, MULTI_SORTER, GtkSorter)
+
+GDK_AVAILABLE_IN_ALL
+GtkSorter *             gtk_multi_sorter_new                    (void);
+
+GDK_AVAILABLE_IN_ALL
+void                    gtk_multi_sorter_append                 (GtkMultiSorter         *self,
+                                                                 GtkSorter              *sorter);
+
+GDK_AVAILABLE_IN_ALL
+void                    gtk_multi_sorter_remove                 (GtkMultiSorter         *self,
+                                                                 guint                   position);
+
+G_END_DECLS
+
+#endif /* __GTK_MULTI_SORTER_H__ */
diff --git a/gtk/meson.build b/gtk/meson.build
index d13982d433..234d0801a7 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -290,6 +290,7 @@ gtk_public_sources = files([
   'gtkmodules.c',
   'gtkmountoperation.c',
   'gtkmultifilter.c',
+  'gtkmultisorter.c',
   'gtknativedialog.c',
   'gtknomediafile.c',
   'gtknoselection.c',
@@ -550,6 +551,7 @@ gtk_public_headers = files([
   'gtkmessagedialog.h',
   'gtkmountoperation.h',
   'gtkmultifilter.h',
+  'gtkmultisorter.h',
   'gtknative.h',
   'gtknativedialog.h',
   'gtknoselection.h',
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