[gtk/wip/otte/listview: 886/1040] Add GtkMultiFilter, GtkAnyFilter, GtkEveryFilter

[Benjamin Otte <otte src gnome org>]

commit b3ade5cec39dee62054c615187a4537ed974b762
Author: Benjamin Otte <otte redhat com>
Date:   Wed Dec 11 21:28:38 2019 +0100

    Add GtkMultiFilter, GtkAnyFilter, GtkEveryFilter
    
    GtkMultiFilter is the abstract base class for managing multiple child
    filter.
    GtkAnyFilter and GtkEveryFilter are the actual implementations.

 docs/reference/gtk/gtk4-docs.xml     |   1 +
 docs/reference/gtk/gtk4-sections.txt |  23 ++
 docs/reference/gtk/gtk4.types.in     |   3 +
 gtk/gtk.h                            |   1 +
 gtk/gtkmultifilter.c                 | 430 +++++++++++++++++++++++++++++++++++
 gtk/gtkmultifilter.h                 |  58 +++++
 gtk/meson.build                      |   2 +
 7 files changed, 518 insertions(+)
---
diff --git a/docs/reference/gtk/gtk4-docs.xml b/docs/reference/gtk/gtk4-docs.xml
index d148e28efd..4e1fa87c31 100644
--- a/docs/reference/gtk/gtk4-docs.xml
+++ b/docs/reference/gtk/gtk4-docs.xml
@@ -50,6 +50,7 @@
         <xi:include href="xml/gtkfilter.xml" />
         <xi:include href="xml/gtkcustomfilter.xml" />
         <xi:include href="xml/gtkstringfilter.xml" />
+        <xi:include href="xml/gtkmultifilter.xml" />
       </section>
       <xi:include href="xml/gtkflattenlistmodel.xml" />
       <xi:include href="xml/gtkmaplistmodel.xml" />
diff --git a/docs/reference/gtk/gtk4-sections.txt b/docs/reference/gtk/gtk4-sections.txt
index 289ac80a15..b735a6e83d 100644
--- a/docs/reference/gtk/gtk4-sections.txt
+++ b/docs/reference/gtk/gtk4-sections.txt
@@ -1372,6 +1372,29 @@ GTK_CUSTOM_FILTER_GET_CLASS
 gtk_custom_filter_get_type
 </SECTION>
 
+<SECTION>
+<FILE>gtkmultifilter</FILE>
+<TITLE>GtkMultiFilter</TITLE>
+GtkMultiFilter
+gtk_multi_filter_append
+gtk_multi_filter_remove
+<SUBSECTION>
+GtkAnyFilter
+gtk_any_filter_new
+<SUBSECTION>
+GtkEveryFilter
+gtk_every_filter_new
+<SUBSECTION Standard>
+GTK_CUSTOM_FILTER
+GTK_IS_CUSTOM_FILTER
+GTK_TYPE_CUSTOM_FILTER
+GTK_CUSTOM_FILTER_CLASS
+GTK_IS_CUSTOM_FILTER_CLASS
+GTK_CUSTOM_FILTER_GET_CLASS
+<SUBSECTION Private>
+gtk_custom_filter_get_type
+</SECTION>
+
 <SECTION>
 <FILE>gtkfilterlistmodel</FILE>
 <TITLE>GtkFilterListModel</TITLE>
diff --git a/docs/reference/gtk/gtk4.types.in b/docs/reference/gtk/gtk4.types.in
index cbf2bcc42e..bef7f2d16c 100644
--- a/docs/reference/gtk/gtk4.types.in
+++ b/docs/reference/gtk/gtk4.types.in
@@ -9,6 +9,7 @@ gtk_accessible_get_type
 gtk_actionable_get_type
 gtk_action_bar_get_type
 gtk_adjustment_get_type
+gtk_any_filter_get_type
 gtk_app_chooser_get_type
 gtk_app_chooser_button_get_type
 gtk_app_chooser_dialog_get_type
@@ -72,6 +73,7 @@ gtk_event_controller_key_get_type
 gtk_event_controller_legacy_get_type
 gtk_event_controller_motion_get_type
 gtk_event_controller_scroll_get_type
+gtk_every_filter_get_type
 gtk_expander_get_type
 gtk_file_chooser_button_get_type
 gtk_file_chooser_dialog_get_type
@@ -128,6 +130,7 @@ gtk_menu_button_get_type
 gtk_menu_tool_button_get_type
 gtk_message_dialog_get_type
 gtk_mount_operation_get_type
+gtk_multi_filter_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 e69f48883e..09360a2bbf 100644
--- a/gtk/gtk.h
+++ b/gtk/gtk.h
@@ -163,6 +163,7 @@
 #include <gtk/gtkmenutoolbutton.h>
 #include <gtk/gtkmessagedialog.h>
 #include <gtk/gtkmountoperation.h>
+#include <gtk/gtkmultifilter.h>
 #include <gtk/gtknative.h>
 #include <gtk/gtknativedialog.h>
 #include <gtk/gtknoselection.h>
diff --git a/gtk/gtkmultifilter.c b/gtk/gtkmultifilter.c
new file mode 100644
index 0000000000..ae20939b34
--- /dev/null
+++ b/gtk/gtkmultifilter.c
@@ -0,0 +1,430 @@
+/*
+ * Copyright © 2019 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 "gtkmultifilter.h"
+
+#include "gtkbuildable.h"
+#include "gtkintl.h"
+#include "gtktypebuiltins.h"
+
+/*** MULTI FILTER ***/
+
+/**
+ * SECTION:gtkmultifilter
+ * @Title: GtkMultiFilter
+ * @Short_description: Combining multiple filter 
+ *
+ * GtkMultiFilter is the base type that implements support for handling
+ * multiple filter.
+ *
+ * GtkAnyFilter is an implementation of GtkMultiFilter that matches an item
+ * when at least one of its filter matches.
+ *
+ * GtkEveryFilter is an implementation of GtkMultiFilter that matches an item
+ * when each of its child filter matches.
+ */
+struct _GtkMultiFilter
+{
+  GtkFilter parent_instance;
+
+  GSequence *filters;
+};
+
+struct _GtkMultiFilterClass
+{
+  GtkFilterClass parent_class;
+
+  GtkFilterChange addition_change;
+  GtkFilterChange removal_change;
+};
+
+static GType
+gtk_multi_filter_get_item_type (GListModel *list)
+{
+  return GTK_TYPE_FILTER;
+}
+
+static guint
+gtk_multi_filter_get_n_items (GListModel *list)
+{
+  GtkMultiFilter *self = GTK_MULTI_FILTER (list);
+
+  return g_sequence_get_length (self->filters);
+}
+
+static gpointer
+gtk_multi_filter_get_item (GListModel *list,
+                           guint       position)
+{
+  GtkMultiFilter *self = GTK_MULTI_FILTER (list);
+  GSequenceIter *iter;
+
+  iter = g_sequence_get_iter_at_pos (self->filters, position);
+
+  if (g_sequence_iter_is_end (iter))
+    return NULL;
+  else
+    return g_object_ref (g_sequence_get (iter));
+}
+
+static void
+gtk_multi_filter_list_model_init (GListModelInterface *iface)
+{
+  iface->get_item_type = gtk_multi_filter_get_item_type;
+  iface->get_n_items = gtk_multi_filter_get_n_items;
+  iface->get_item = gtk_multi_filter_get_item;
+}
+
+static GtkBuildableIface *parent_buildable_iface;
+
+static void
+gtk_multi_filter_buildable_add_child (GtkBuildable *buildable,
+                                      GtkBuilder   *builder,
+                                      GObject      *child,
+                                      const gchar  *type)
+{
+  if (GTK_IS_FILTER (child))
+    gtk_multi_filter_append (GTK_MULTI_FILTER (buildable), g_object_ref (GTK_FILTER (child)));
+  else
+    parent_buildable_iface->add_child (buildable, builder, child, type);
+}
+
+static void
+gtk_multi_filter_buildable_init (GtkBuildableIface *iface)
+{
+  parent_buildable_iface = g_type_interface_peek_parent (iface);
+
+  iface->add_child = gtk_multi_filter_buildable_add_child;
+}
+
+G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GtkMultiFilter, gtk_multi_filter, GTK_TYPE_FILTER,
+                                  G_IMPLEMENT_INTERFACE (G_TYPE_LIST_MODEL, gtk_multi_filter_list_model_init)
+                                  G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE, 
gtk_multi_filter_buildable_init))
+
+static void
+gtk_multi_filter_changed_cb (GtkFilter       *filter,
+                             GtkFilterChange  change,
+                             GtkMultiFilter  *self)
+{
+  gtk_filter_changed (GTK_FILTER (self), change);
+}
+
+static void
+gtk_multi_filter_remove_iter (GtkMultiFilter *self,
+                              GSequenceIter  *iter)
+{
+  GtkFilter *filter;
+
+  filter = g_sequence_get (iter);
+  g_signal_handlers_disconnect_by_func (filter, gtk_multi_filter_changed_cb, self);
+  g_object_unref (filter);
+  g_sequence_remove (iter);
+}
+
+static void
+gtk_multi_filter_dispose (GObject *object)
+{
+  GtkMultiFilter *self = GTK_MULTI_FILTER (object);
+
+  while (!g_sequence_is_empty (self->filters))
+    gtk_multi_filter_remove_iter (self, g_sequence_get_begin_iter (self->filters));
+
+  G_OBJECT_CLASS (gtk_multi_filter_parent_class)->dispose (object);
+}
+
+static void
+gtk_multi_filter_finalize (GObject *object)
+{
+  GtkMultiFilter *self = GTK_MULTI_FILTER (object);
+
+  g_sequence_free (self->filters);
+
+  G_OBJECT_CLASS (gtk_multi_filter_parent_class)->finalize (object);
+}
+
+static void
+gtk_multi_filter_class_init (GtkMultiFilterClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  object_class->dispose = gtk_multi_filter_dispose;
+  object_class->finalize = gtk_multi_filter_finalize;
+}
+
+static void
+gtk_multi_filter_init (GtkMultiFilter *self)
+{
+  self->filters = g_sequence_new (NULL);
+}
+
+/**
+ * gtk_multi_filter_append:
+ * @self: a #GtkMultiFilter
+ * @filter: (transfer none): A new filter to use
+ *
+ * Adds a @filter to @self to use for matching.
+ **/
+void
+gtk_multi_filter_append (GtkMultiFilter *self,
+                         GtkFilter    *filter)
+{
+  g_return_if_fail (GTK_IS_MULTI_FILTER (self));
+  g_return_if_fail (GTK_IS_FILTER (filter));
+
+  g_signal_connect (filter, "changed", G_CALLBACK (gtk_multi_filter_changed_cb), self);
+  g_sequence_append (self->filters, g_object_ref (filter));
+
+  gtk_filter_changed (GTK_FILTER (self),
+                      GTK_MULTI_FILTER_GET_CLASS (self)->addition_change);
+}
+
+/**
+ * gtk_multi_filter_remove:
+ * @self: a #GtkMultiFilter
+ * @position: position of filter to remove
+ *
+ * Removes the filter at the given @position from the list of filters used
+ * by @self.
+ * If @position is larger than the number of filters, nothing happens and
+ * the function returns.
+ **/
+void
+gtk_multi_filter_remove (GtkMultiFilter *self,
+                         guint           position)
+{
+  GSequenceIter *iter;
+  guint length;
+
+  length = g_sequence_get_length (self->filters);
+  if (position >= length)
+    return;
+
+  iter = g_sequence_get_iter_at_pos (self->filters, position);
+  gtk_multi_filter_remove_iter (self, iter);
+
+  gtk_filter_changed (GTK_FILTER (self),
+                      GTK_MULTI_FILTER_GET_CLASS (self)->removal_change);
+}
+
+/*** ANY FILTER ***/
+
+struct _GtkAnyFilter
+{
+  GtkMultiFilter parent_instance;
+};
+
+struct _GtkAnyFilterClass
+{
+  GtkMultiFilterClass parent_class;
+};
+
+G_DEFINE_TYPE (GtkAnyFilter, gtk_any_filter, GTK_TYPE_MULTI_FILTER)
+
+static gboolean
+gtk_any_filter_match (GtkFilter *filter,
+                      gpointer   item)
+{
+  GtkMultiFilter *self = GTK_MULTI_FILTER (filter);
+  GSequenceIter *iter;
+
+  for (iter = g_sequence_get_begin_iter (self->filters);
+       !g_sequence_iter_is_end (iter);
+       iter = g_sequence_iter_next (iter))
+    {
+      GtkFilter *child = g_sequence_get (iter);
+
+      if (gtk_filter_match (child, item))
+        return TRUE;
+    }
+
+  return FALSE;
+}
+
+static GtkFilterMatch
+gtk_any_filter_get_strictness (GtkFilter *filter)
+{
+  GtkMultiFilter *multi = GTK_MULTI_FILTER (filter);
+  GSequenceIter *iter;
+  GtkFilterMatch result = GTK_FILTER_MATCH_NONE;
+
+  for (iter = g_sequence_get_begin_iter (multi->filters);
+       !g_sequence_iter_is_end (iter);
+       iter = g_sequence_iter_next (iter))
+    {
+      GtkFilter *child = g_sequence_get (iter);
+
+      switch (gtk_filter_get_strictness (child))
+      {
+        case GTK_FILTER_MATCH_SOME:
+          result = GTK_FILTER_MATCH_SOME;
+          break;
+        case GTK_FILTER_MATCH_NONE:
+          break;
+        case GTK_FILTER_MATCH_ALL:
+          return GTK_FILTER_MATCH_ALL;
+        default:
+          g_return_val_if_reached (GTK_FILTER_MATCH_NONE);
+          break;
+      }
+    }
+
+  return result;
+}
+
+static void
+gtk_any_filter_class_init (GtkAnyFilterClass *class)
+{
+  GtkMultiFilterClass *multi_filter_class = GTK_MULTI_FILTER_CLASS (class);
+  GtkFilterClass *filter_class = GTK_FILTER_CLASS (class);
+
+  multi_filter_class->addition_change = GTK_FILTER_CHANGE_LESS_STRICT;
+  multi_filter_class->removal_change = GTK_FILTER_CHANGE_MORE_STRICT;
+
+  filter_class->match = gtk_any_filter_match;
+  filter_class->get_strictness = gtk_any_filter_get_strictness;
+}
+
+static void
+gtk_any_filter_init (GtkAnyFilter *self)
+{
+}
+
+/**
+ * gtk_any_filter_new:
+ *
+ * Creates a new empty "any" filter.  
+ * Use gtk_multi_filter_append() to add filters to it.
+ *
+ * This filter matches an item if any of the filters added to it
+ * matches the item.
+ * In particular, this means that if no filter has been added to
+ * it, the filter matches no item.
+ *
+ * Returns: a new #GtkFilter
+ **/
+GtkFilter *
+gtk_any_filter_new (void)
+{
+  return g_object_new (GTK_TYPE_ANY_FILTER, NULL);
+}
+
+/*** EVERY FILTER ***/
+
+struct _GtkEveryFilter
+{
+  GtkMultiFilter parent_instance;
+};
+
+struct _GtkEveryFilterClass
+{
+  GtkMultiFilterClass parent_class;
+};
+
+G_DEFINE_TYPE (GtkEveryFilter, gtk_every_filter, GTK_TYPE_MULTI_FILTER)
+
+static gboolean
+gtk_every_filter_match (GtkFilter *filter,
+                        gpointer   item)
+{
+  GtkMultiFilter *self = GTK_MULTI_FILTER (filter);
+  GSequenceIter *iter;
+
+  for (iter = g_sequence_get_begin_iter (self->filters);
+       !g_sequence_iter_is_end (iter);
+       iter = g_sequence_iter_next (iter))
+    {
+      GtkFilter *child = g_sequence_get (iter);
+
+      if (!gtk_filter_match (child, item))
+        return FALSE;
+    }
+
+  return TRUE;
+}
+
+static GtkFilterMatch
+gtk_every_filter_get_strictness (GtkFilter *filter)
+{
+  GtkMultiFilter *multi = GTK_MULTI_FILTER (filter);
+  GSequenceIter *iter;
+  GtkFilterMatch result = GTK_FILTER_MATCH_ALL;
+
+  for (iter = g_sequence_get_begin_iter (multi->filters);
+       !g_sequence_iter_is_end (iter);
+       iter = g_sequence_iter_next (iter))
+    {
+      GtkFilter *child = g_sequence_get (iter);
+
+      switch (gtk_filter_get_strictness (child))
+      {
+        case GTK_FILTER_MATCH_SOME:
+          result = GTK_FILTER_MATCH_SOME;
+          break;
+        case GTK_FILTER_MATCH_NONE:
+          return GTK_FILTER_MATCH_NONE;
+        case GTK_FILTER_MATCH_ALL:
+          break;
+        default:
+          g_return_val_if_reached (GTK_FILTER_MATCH_NONE);
+          break;
+      }
+    }
+
+  return result;
+}
+
+static void
+gtk_every_filter_class_init (GtkEveryFilterClass *class)
+{
+  GtkMultiFilterClass *multi_filter_class = GTK_MULTI_FILTER_CLASS (class);
+  GtkFilterClass *filter_class = GTK_FILTER_CLASS (class);
+
+  multi_filter_class->addition_change = GTK_FILTER_CHANGE_MORE_STRICT;
+  multi_filter_class->removal_change = GTK_FILTER_CHANGE_LESS_STRICT;
+
+  filter_class->match = gtk_every_filter_match;
+  filter_class->get_strictness = gtk_every_filter_get_strictness;
+}
+
+static void
+gtk_every_filter_init (GtkEveryFilter *self)
+{
+}
+
+/**
+ * gtk_every_filter_new:
+ *
+ * Creates a new empty "every" filter.  
+ * Use gtk_multi_filter_append() to add filters to it.
+ *
+ * This filter matches an item if every of the filters added to it
+ * matches the item.
+ * In particular, this means that if no filter has been added to
+ * it, the filter matches every item.
+ *
+ * Returns: a new #GtkFilter
+ **/
+GtkFilter *
+gtk_every_filter_new (void)
+{
+  return g_object_new (GTK_TYPE_EVERY_FILTER, NULL);
+}
+
diff --git a/gtk/gtkmultifilter.h b/gtk/gtkmultifilter.h
new file mode 100644
index 0000000000..eafa56e1d0
--- /dev/null
+++ b/gtk/gtkmultifilter.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright © 2019 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_MULTI_FILTER_H__
+#define __GTK_MULTI_FILTER_H__
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gtk/gtkfilter.h>
+#include <gtk/gtktypes.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_MULTI_FILTER             (gtk_multi_filter_get_type ())
+GDK_AVAILABLE_IN_ALL
+GDK_DECLARE_EXPORTED_TYPE (GtkMultiFilter, gtk_multi_filter, GTK, MULTI_FILTER)
+
+GDK_AVAILABLE_IN_ALL
+void                    gtk_multi_filter_append                 (GtkMultiFilter         *self,
+                                                                 GtkFilter              *filter);
+GDK_AVAILABLE_IN_ALL
+void                    gtk_multi_filter_remove                 (GtkMultiFilter         *self,
+                                                                 guint                   position);
+
+#define GTK_TYPE_ANY_FILTER             (gtk_any_filter_get_type ())
+GDK_AVAILABLE_IN_ALL
+GDK_DECLARE_EXPORTED_TYPE (GtkAnyFilter, gtk_any_filter, GTK, ANY_FILTER)
+GDK_AVAILABLE_IN_ALL
+GtkFilter *             gtk_any_filter_new                      (void);
+
+#define GTK_TYPE_EVERY_FILTER             (gtk_every_filter_get_type ())
+GDK_AVAILABLE_IN_ALL
+GDK_DECLARE_EXPORTED_TYPE (GtkEveryFilter, gtk_every_filter, GTK, EVERY_FILTER)
+GDK_AVAILABLE_IN_ALL
+GtkFilter *             gtk_every_filter_new                    (void);
+
+
+G_END_DECLS
+
+#endif /* __GTK_MULTI_FILTER_H__ */
diff --git a/gtk/meson.build b/gtk/meson.build
index cbb149aac4..9d4c337131 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -288,6 +288,7 @@ gtk_public_sources = files([
   'gtkmodelbutton.c',
   'gtkmodules.c',
   'gtkmountoperation.c',
+  'gtkmultifilter.c',
   'gtknativedialog.c',
   'gtknomediafile.c',
   'gtknoselection.c',
@@ -544,6 +545,7 @@ gtk_public_headers = files([
   'gtkmenutoolbutton.h',
   'gtkmessagedialog.h',
   'gtkmountoperation.h',
+  'gtkmultifilter.h',
   'gtknative.h',
   'gtknativedialog.h',
   'gtknoselection.h',