[gtk/wip/otte/listview: 324/327] gtk: Add GtkSelectionModel
- From: Benjamin Otte <otte src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk/wip/otte/listview: 324/327] gtk: Add GtkSelectionModel
- Date: Fri, 4 Jan 2019 23:37:52 +0000 (UTC)
commit ec0483bdfe579301e3f78cf04a4bb7c6b04a3984
Author: Benjamin Otte <otte redhat com>
Date: Wed Oct 3 18:49:48 2018 +0200
gtk: Add GtkSelectionModel
The selection model is a list model interface that takes care of
selections and is to be used by the list model widgets to manage their
selections.
docs/reference/gtk/gtk4-sections.txt | 24 ++++
gtk/gtk.h | 1 +
gtk/gtkselectionmodel.c | 264 +++++++++++++++++++++++++++++++++++
gtk/gtkselectionmodel.h | 117 ++++++++++++++++
gtk/meson.build | 2 +
5 files changed, 408 insertions(+)
---
diff --git a/docs/reference/gtk/gtk4-sections.txt b/docs/reference/gtk/gtk4-sections.txt
index 00cba2b9a6..ce2a3c73d5 100644
--- a/docs/reference/gtk/gtk4-sections.txt
+++ b/docs/reference/gtk/gtk4-sections.txt
@@ -442,6 +442,30 @@ gtk_list_box_get_type
gtk_list_box_row_get_type
</SECTION>
+<SECTION>
+<FILE>gtkselectionmodel</FILE>
+<TITLE>GtkSelectionModel</TITLE>
+GtkSelectionModel
+gtk_selection_model_is_selected
+gtk_selection_model_select_item
+gtk_selection_model_unselect_item
+gtk_selection_model_select_range
+gtk_selection_model_unselect_range
+gtk_selection_model_select_all
+gtk_selection_model_unselect_all
+<SUBSECTION>
+gtk_selection_model_selection_changed
+<SUBSECTION Standard>
+GTK_SELECTION_MODEL
+GTK_SELECTION_MODEL_CLASS
+GTK_SELECTION_MODEL_GET_CLASS
+GTK_IS_SELECTION_MODEL
+GTK_IS_SELECTION_MODEL_CLASS
+GTK_TYPE_SELECTION_MODEL
+<SUBSECTION Private>
+gtk_selection_model_get_type
+</SECTION>
+
<SECTION>
<FILE>gtklistitem</FILE>
<TITLE>GtkListItem</TITLE>
diff --git a/gtk/gtk.h b/gtk/gtk.h
index 75207a17b7..d225841217 100644
--- a/gtk/gtk.h
+++ b/gtk/gtk.h
@@ -188,6 +188,7 @@
#include <gtk/gtksearchbar.h>
#include <gtk/gtksearchentry.h>
#include <gtk/gtkselection.h>
+#include <gtk/gtkselectionmodel.h>
#include <gtk/gtkseparator.h>
#include <gtk/gtkseparatormenuitem.h>
#include <gtk/gtkseparatortoolitem.h>
diff --git a/gtk/gtkselectionmodel.c b/gtk/gtkselectionmodel.c
new file mode 100644
index 0000000000..7075402e11
--- /dev/null
+++ b/gtk/gtkselectionmodel.c
@@ -0,0 +1,264 @@
+/*
+ * 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 "gtkselectionmodel.h"
+
+#include "gtkmarshalers.h"
+
+/**
+ * SECTION:gtkselectionmodel
+ * @Title: GtkSelectionModel
+ * @Short_description: An extension of the list model interface that handles selections
+ * @See_also: #GListModel, #GtkSingleSelection
+ *
+ * #GtkSelectionModel is an interface that extends the #GListModel interface by adding
+ * support for selections. This support is then used by widgets using list models to add
+ * the ability to select and unselect various items.
+ *
+ * GTK provides default implementations of the mode common selection modes such as
+ * #GtkSingleSelection, so you will only need to implement this interface if you want
+ * detailed control about how selections should be handled.
+ *
+ * A #GtkSelectionModel supports a single boolean per row indicating if a row is selected
+ * or not. This can be queried via gtk_selection_model_is_selected(). When the selected
+ * state of one or more rows changes, the model will emit the
+ * GtkSelectionModel::selection-changed signal by calling the
+ * gtk_selection_model_selection_changed() function. The positions given in that signal
+ * may have their selection state changed, though that is not a requirement.
+ * If new items added to the model via the #GListModel::items-changed signal are selected
+ * or not is up to the implementation.
+ *
+ * Additionally, the interface can expose functionality to select and unselect items.
+ * If these functions are implemented, GTK's list widgets will allow users to select and
+ * unselect items. However, #GtkSelectionModels are free to only implement them
+ * partially or not at all. In that case the widgets will not support the unimplemented
+ * operations.
+ *
+ * When selecting or unselecting is supported by a model, the return values of the
+ * selection functions do NOT indicate if selection or unselection happened. They are
+ * only meant to indicate complete failure, like when this mode of selecting is not
+ * supported by the model.
+ * Selections may happen asynchronously, so the only reliable way to find out when an
+ * item was selected is to listen to the signals that indicate selection.
+ */
+
+G_DEFINE_INTERFACE (GtkSelectionModel, gtk_selection_model, G_TYPE_LIST_MODEL)
+
+enum {
+ SELECTION_CHANGED,
+ LAST_SIGNAL
+};
+
+static guint signals[LAST_SIGNAL] = { 0 };
+
+static gboolean
+gtk_selection_model_default_is_selected (GtkSelectionModel *model,
+ guint position)
+{
+ return FALSE;
+}
+
+static gboolean
+gtk_selection_model_default_select_item (GtkSelectionModel *model,
+ guint position,
+ gboolean exclusive)
+{
+ return FALSE;
+}
+static gboolean
+gtk_selection_model_default_unselect_item (GtkSelectionModel *model,
+ guint position)
+{
+ return FALSE;
+}
+
+static gboolean
+gtk_selection_model_default_select_range (GtkSelectionModel *model,
+ guint position,
+ guint n_items,
+ gboolean exclusive)
+{
+ return FALSE;
+}
+
+static gboolean
+gtk_selection_model_default_unselect_range (GtkSelectionModel *model,
+ guint position,
+ guint n_items)
+{
+ return FALSE;
+}
+
+static gboolean
+gtk_selection_model_default_select_all (GtkSelectionModel *model)
+{
+ return gtk_selection_model_select_range (model, 0, g_list_model_get_n_items (G_LIST_MODEL (model)), FALSE);
+}
+
+static gboolean
+gtk_selection_model_default_unselect_all (GtkSelectionModel *model)
+{
+ return gtk_selection_model_unselect_range (model, 0, g_list_model_get_n_items (G_LIST_MODEL (model)));;
+}
+
+static void
+gtk_selection_model_default_init (GtkSelectionModelInterface *iface)
+{
+ iface->is_selected = gtk_selection_model_default_is_selected;
+ iface->select_item = gtk_selection_model_default_select_item;
+ iface->unselect_item = gtk_selection_model_default_unselect_item;
+ iface->select_range = gtk_selection_model_default_select_range;
+ iface->unselect_range = gtk_selection_model_default_unselect_range;
+ iface->select_all = gtk_selection_model_default_select_all;
+ iface->unselect_all = gtk_selection_model_default_unselect_all;
+
+ /**
+ * GtkSelectionModel::selection-changed
+ * @model: a #GtkSelectionModel
+ * @position: The first item that may have changed
+ * @n_items: number of items with changes
+ *
+ * Emitted when the selection state of some of the items in @model changes.
+ *
+ * Note that this signal does not specify the new selection state of the items,
+ * they need to be queried manually.
+ * It is also not necessary for a model to change the selection state of any of
+ * the items in the selection model, though it would be rather useless to emit
+ * such a signal.
+ */
+ signals[SELECTION_CHANGED] =
+ g_signal_new ("selection-changed",
+ GTK_TYPE_SELECTION_MODEL,
+ G_SIGNAL_RUN_LAST,
+ 0,
+ NULL, NULL,
+ _gtk_marshal_VOID__UINT_UINT,
+ G_TYPE_NONE, 2, G_TYPE_UINT, G_TYPE_UINT);
+ g_signal_set_va_marshaller (signals[SELECTION_CHANGED],
+ GTK_TYPE_SELECTION_MODEL,
+ _gtk_marshal_VOID__UINT_UINTv);
+}
+
+/**
+ * gtk_selection_model_is_selected:
+ * @model: a #GtkSelectionModel
+ * @position: the position of the item to query
+ *
+ * Checks if the given item is selected.
+ *
+ * Returns: %TRUE if the item is selected
+ **/
+gboolean
+gtk_selection_model_is_selected (GtkSelectionModel *model,
+ guint position)
+{
+ GtkSelectionModelInterface *iface;
+
+ g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), 0);
+
+ iface = GTK_SELECTION_MODEL_GET_IFACE (model);
+ return iface->is_selected (model, position);
+}
+
+gboolean
+gtk_selection_model_select_item (GtkSelectionModel *model,
+ guint position,
+ gboolean exclusive)
+{
+ GtkSelectionModelInterface *iface;
+
+ g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), 0);
+
+ iface = GTK_SELECTION_MODEL_GET_IFACE (model);
+ return iface->select_item (model, position, exclusive);
+}
+
+gboolean
+gtk_selection_model_unselect_item (GtkSelectionModel *model,
+ guint position)
+{
+ GtkSelectionModelInterface *iface;
+
+ g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), 0);
+
+ iface = GTK_SELECTION_MODEL_GET_IFACE (model);
+ return iface->unselect_item (model, position);
+}
+
+gboolean
+gtk_selection_model_select_range (GtkSelectionModel *model,
+ guint position,
+ guint n_items,
+ gboolean exclusive)
+{
+ GtkSelectionModelInterface *iface;
+
+ g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), 0);
+
+ iface = GTK_SELECTION_MODEL_GET_IFACE (model);
+ return iface->select_range (model, position, n_items, exclusive);
+}
+
+gboolean
+gtk_selection_model_unselect_range (GtkSelectionModel *model,
+ guint position,
+ guint n_items)
+{
+ GtkSelectionModelInterface *iface;
+
+ g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), 0);
+
+ iface = GTK_SELECTION_MODEL_GET_IFACE (model);
+ return iface->unselect_range (model, position, n_items);
+}
+
+gboolean
+gtk_selection_model_select_all (GtkSelectionModel *model)
+{
+ GtkSelectionModelInterface *iface;
+
+ g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), 0);
+
+ iface = GTK_SELECTION_MODEL_GET_IFACE (model);
+ return iface->select_all (model);
+}
+
+gboolean
+gtk_selection_model_unselect_all (GtkSelectionModel *model)
+{
+ GtkSelectionModelInterface *iface;
+
+ g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), 0);
+
+ iface = GTK_SELECTION_MODEL_GET_IFACE (model);
+ return iface->unselect_all (model);
+}
+
+void
+gtk_selection_model_selection_changed (GtkSelectionModel *model,
+ guint position,
+ guint n_items)
+{
+ g_return_if_fail (GTK_IS_SELECTION_MODEL (model));
+
+ g_signal_emit (model, signals[SELECTION_CHANGED], 0, position, n_items);
+}
+
diff --git a/gtk/gtkselectionmodel.h b/gtk/gtkselectionmodel.h
new file mode 100644
index 0000000000..9904888d82
--- /dev/null
+++ b/gtk/gtkselectionmodel.h
@@ -0,0 +1,117 @@
+/*
+ * 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_SELECTION_MODEL_H__
+#define __GTK_SELECTION_MODEL_H__
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gdk/gdk.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_SELECTION_MODEL (gtk_selection_model_get_type ())
+
+GDK_AVAILABLE_IN_ALL
+G_DECLARE_INTERFACE (GtkSelectionModel, gtk_selection_model, GTK, SELECTION_MODEL, GListModel)
+
+/**
+ * GtkSelectionModelInterface:
+ * @is_selected: Return if the item at the given position is selected.
+ * @select_item: Select the item in the given position. If the operation
+ * is known to fail, return %FALSE.
+ * @unselect_item: Unselect the item in the given position. If the
+ * operation is known to fail, return %FALSE.
+ * @select_range: Select all items in the given range. If the operation
+ * is unsupported or known to fail for all items, return %FALSE.
+ * @unselect_range: Unselect all items in the given range. If the
+ * operation is unsupported or known to fail for all items, return
+ * %FALSE.
+ * @select_all: Select all items in the model. If the operation is
+ * unsupported or known to fail for all items, return %FALSE.
+ * @unselect_all: Unselect all items in the model. If the operation is
+ * unsupported or known to fail for all items, return %FALSE.
+ *
+ * The list of virtual functions for the #GtkSelectionModel interface.
+ * All getter functions are mandatory to implement, but the model does
+ * not need to implement any functions to support selecting or unselecting
+ * items. Of course, if the model does not do that, it means that users
+ * cannot select or unselect items in a list widgets using the model.
+ */
+struct _GtkSelectionModelInterface
+{
+ /*< private >*/
+ GTypeInterface g_iface;
+
+ /*< public >*/
+ gboolean (* is_selected) (GtkSelectionModel *model,
+ guint position);
+
+ gboolean (* select_item) (GtkSelectionModel *model,
+ guint position,
+ gboolean exclusive);
+ gboolean (* unselect_item) (GtkSelectionModel *model,
+ guint position);
+ gboolean (* select_range) (GtkSelectionModel *model,
+ guint position,
+ guint n_items,
+ gboolean exclusive);
+ gboolean (* unselect_range) (GtkSelectionModel *model,
+ guint position,
+ guint n_items);
+ gboolean (* select_all) (GtkSelectionModel *model);
+ gboolean (* unselect_all) (GtkSelectionModel *model);
+};
+
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_selection_model_is_selected (GtkSelectionModel *model,
+ guint position);
+
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_selection_model_select_item (GtkSelectionModel *model,
+ guint position,
+ gboolean exclusive);
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_selection_model_unselect_item (GtkSelectionModel *model,
+ guint position);
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_selection_model_select_range (GtkSelectionModel *model,
+ guint position,
+ guint n_items,
+ gboolean exclusive);
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_selection_model_unselect_range (GtkSelectionModel *model,
+ guint position,
+ guint n_items);
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_selection_model_select_all (GtkSelectionModel *model);
+GDK_AVAILABLE_IN_ALL
+gboolean gtk_selection_model_unselect_all (GtkSelectionModel *model);
+
+/* for implementations only */
+GDK_AVAILABLE_IN_ALL
+void gtk_selection_model_selection_changed (GtkSelectionModel *model,
+ guint position,
+ guint n_items);
+
+G_END_DECLS
+
+#endif /* __GTK_SELECTION_MODEL_H__ */
diff --git a/gtk/meson.build b/gtk/meson.build
index eb05b6acdc..3e86924bca 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -328,6 +328,7 @@ gtk_public_sources = files([
'gtksearchbar.c',
'gtksearchentry.c',
'gtkselection.c',
+ 'gtkselectionmodel.c',
'gtkseparator.c',
'gtkseparatormenuitem.c',
'gtkseparatortoolitem.c',
@@ -566,6 +567,7 @@ gtk_public_headers = files([
'gtksearchbar.h',
'gtksearchentry.h',
'gtkselection.h',
+ 'gtkselectionmodel.h',
'gtkseparator.h',
'gtkseparatormenuitem.h',
'gtkseparatortoolitem.h',
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