forked from AuroraMiddleware/gtk
c2da2f7ecd
When the position is 0, we can't check for unchanged elements below with gtk_bitset_size_in_range. And we don't need to, either. And be careful when translating [start,length] intervals to [first,last] ones. Off-by-one errors lurk everywhere.
374 lines
11 KiB
C
374 lines
11 KiB
C
/*
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* Copyright © 2020 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authors: Matthias Clasen
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*/
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#include "config.h"
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#include "gtkselectionfiltermodel.h"
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#include "gtkbitset.h"
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#include "gtkintl.h"
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#include "gtkprivate.h"
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/**
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* SECTION:gtkselectionfiltermodel
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* @title: GtkSelectionFilterModel
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* @short_description: A list model that turns a selection in a model
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* @see_also: #GtkSelectionModel
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*
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* #GtkSelectionFilterModel is a list model that presents the
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* selected items in a #GtkSelectionModel as its own list model.
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*/
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enum {
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PROP_0,
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PROP_ITEM_TYPE,
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PROP_MODEL,
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NUM_PROPERTIES
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};
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struct _GtkSelectionFilterModel
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{
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GObject parent_instance;
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GType item_type;
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GtkSelectionModel *model;
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GtkBitset *selection;
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};
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struct _GtkSelectionFilterModelClass
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{
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GObjectClass parent_class;
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};
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static GParamSpec *properties[NUM_PROPERTIES] = { NULL, };
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static GType
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gtk_selection_filter_model_get_item_type (GListModel *list)
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{
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GtkSelectionFilterModel *self = GTK_SELECTION_FILTER_MODEL (list);
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return self->item_type;
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}
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static guint
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gtk_selection_filter_model_get_n_items (GListModel *list)
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{
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GtkSelectionFilterModel *self = GTK_SELECTION_FILTER_MODEL (list);
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if (self->selection)
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return gtk_bitset_get_size (self->selection);
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return 0;
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}
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static gpointer
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gtk_selection_filter_model_get_item (GListModel *list,
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guint position)
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{
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GtkSelectionFilterModel *self = GTK_SELECTION_FILTER_MODEL (list);
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position = gtk_bitset_get_nth (self->selection, position);
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return g_list_model_get_item (G_LIST_MODEL (self->model), position);
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}
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static void
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gtk_selection_filter_model_list_model_init (GListModelInterface *iface)
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{
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iface->get_item_type = gtk_selection_filter_model_get_item_type;
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iface->get_n_items = gtk_selection_filter_model_get_n_items;
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iface->get_item = gtk_selection_filter_model_get_item;
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}
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G_DEFINE_TYPE_WITH_CODE (GtkSelectionFilterModel, gtk_selection_filter_model, G_TYPE_OBJECT,
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G_IMPLEMENT_INTERFACE (G_TYPE_LIST_MODEL, gtk_selection_filter_model_list_model_init))
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static void
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selection_filter_model_items_changed (GtkSelectionFilterModel *self,
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guint position,
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guint removed,
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guint added)
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{
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GtkBitset *selection;
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guint sel_position = 0;
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guint sel_removed = 0;
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guint sel_added = 0;
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selection = gtk_selection_model_get_selection (self->model);
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if (position > 0)
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sel_position = gtk_bitset_get_size_in_range (self->selection, 0, position - 1);
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if (removed > 0)
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sel_removed = gtk_bitset_get_size_in_range (self->selection, position, position + removed - 1);
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if (added > 0)
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sel_added = gtk_bitset_get_size_in_range (selection, position, position + added - 1);
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gtk_bitset_unref (self->selection);
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self->selection = gtk_bitset_copy (selection);
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gtk_bitset_unref (selection);
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if (sel_removed > 0 || sel_added > 0)
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g_list_model_items_changed (G_LIST_MODEL (self), sel_position, sel_removed, sel_added);
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}
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static void
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gtk_selection_filter_model_items_changed_cb (GListModel *model,
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guint position,
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guint removed,
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guint added,
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GtkSelectionFilterModel *self)
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{
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selection_filter_model_items_changed (self, position, removed, added);
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}
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static void
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gtk_selection_filter_model_selection_changed_cb (GListModel *model,
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guint position,
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guint n_items,
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GtkSelectionFilterModel *self)
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{
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selection_filter_model_items_changed (self, position, n_items, n_items);
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}
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static void
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gtk_selection_filter_model_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GtkSelectionFilterModel *self = GTK_SELECTION_FILTER_MODEL (object);
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switch (prop_id)
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{
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case PROP_ITEM_TYPE:
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self->item_type = g_value_get_gtype (value);
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break;
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case PROP_MODEL:
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gtk_selection_filter_model_set_model (self, g_value_get_object (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gtk_selection_filter_model_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GtkSelectionFilterModel *self = GTK_SELECTION_FILTER_MODEL (object);
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switch (prop_id)
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{
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case PROP_ITEM_TYPE:
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g_value_set_gtype (value, self->item_type);
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break;
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case PROP_MODEL:
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g_value_set_object (value, self->model);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gtk_selection_filter_model_clear_model (GtkSelectionFilterModel *self)
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{
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if (self->model == NULL)
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return;
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g_signal_handlers_disconnect_by_func (self->model, gtk_selection_filter_model_items_changed_cb, self);
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g_signal_handlers_disconnect_by_func (self->model, gtk_selection_filter_model_selection_changed_cb, self);
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g_clear_object (&self->model);
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g_clear_pointer (&self->selection, gtk_bitset_unref);
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}
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static void
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gtk_selection_filter_model_dispose (GObject *object)
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{
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GtkSelectionFilterModel *self = GTK_SELECTION_FILTER_MODEL (object);
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gtk_selection_filter_model_clear_model (self);
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G_OBJECT_CLASS (gtk_selection_filter_model_parent_class)->dispose (object);
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}
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static void
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gtk_selection_filter_model_class_init (GtkSelectionFilterModelClass *class)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (class);
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gobject_class->set_property = gtk_selection_filter_model_set_property;
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gobject_class->get_property = gtk_selection_filter_model_get_property;
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gobject_class->dispose = gtk_selection_filter_model_dispose;
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/**
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* GtkSelectionFilterModel:item-type:
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*
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* The #GType for elements of this object
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*/
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properties[PROP_ITEM_TYPE] =
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g_param_spec_gtype ("item-type",
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P_("Item type"),
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P_("The type of elements of this object"),
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G_TYPE_OBJECT,
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GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_EXPLICIT_NOTIFY);
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/**
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* GtkSelectionFilterModel:model:
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*
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* The model being filtered
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*/
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properties[PROP_MODEL] =
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g_param_spec_object ("model",
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P_("Model"),
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P_("The model being filtered"),
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GTK_TYPE_SELECTION_MODEL,
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GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
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g_object_class_install_properties (gobject_class, NUM_PROPERTIES, properties);
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}
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static void
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gtk_selection_filter_model_init (GtkSelectionFilterModel *self)
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{
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}
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/**
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* gtk_selection_filter_model_new:
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* @model: the selection model to filter
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*
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* Creates a new #GtkSelectionFilterModel that will include the
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* selected items from the underlying selection model.
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*
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* Returns: a new #GtkSelectionFilterModel
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**/
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GtkSelectionFilterModel *
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gtk_selection_filter_model_new (GtkSelectionModel *model)
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{
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GtkSelectionFilterModel *result;
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g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), NULL);
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result = g_object_new (GTK_TYPE_SELECTION_FILTER_MODEL,
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"item-type", g_list_model_get_item_type (G_LIST_MODEL (model)),
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"model", model,
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NULL);
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return result;
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}
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/**
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* gtk_selection_filter_model_new_for_type:
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* @item_type: the type of the items that will be returned
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*
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* Creates a new empty selection filter model set up to return items
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* of type @item_type. It is up to the application to set a proper
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* selection model to ensure the item type is matched.
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*
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* Returns: a new #GtkSelectionFilterModel
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**/
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GtkSelectionFilterModel *
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gtk_selection_filter_model_new_for_type (GType item_type)
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{
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g_return_val_if_fail (g_type_is_a (item_type, G_TYPE_OBJECT), NULL);
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return g_object_new (GTK_TYPE_SELECTION_FILTER_MODEL,
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"item-type", item_type,
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NULL);
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}
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/**
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* gtk_selection_filter_model_set_model:
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* @self: a #GtkSelectionFilterModel
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* @model: (allow-none): The model to be filtered
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*
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* Sets the model to be filtered.
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*
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* Note that GTK makes no effort to ensure that @model conforms to
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* the item type of @self. It assumes that the caller knows what they
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* are doing and have set up an appropriate filter to ensure that item
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* types match.
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**/
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void
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gtk_selection_filter_model_set_model (GtkSelectionFilterModel *self,
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GtkSelectionModel *model)
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{
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guint removed, added;
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g_return_if_fail (GTK_IS_SELECTION_FILTER_MODEL (self));
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g_return_if_fail (model == NULL || GTK_IS_SELECTION_MODEL (model));
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g_return_if_fail (model == NULL || g_type_is_a (g_list_model_get_item_type (G_LIST_MODEL (model)),
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self->item_type));
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if (self->model == model)
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return;
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removed = g_list_model_get_n_items (G_LIST_MODEL (self));
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gtk_selection_filter_model_clear_model (self);
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if (model)
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{
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GtkBitset *selection;
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self->model = g_object_ref (model);
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selection = gtk_selection_model_get_selection (self->model);
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self->selection = gtk_bitset_copy (selection);
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gtk_bitset_unref (selection);
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g_signal_connect (model, "items-changed", G_CALLBACK (gtk_selection_filter_model_items_changed_cb), self);
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g_signal_connect (model, "selection-changed", G_CALLBACK (gtk_selection_filter_model_selection_changed_cb), self);
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}
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added = g_list_model_get_n_items (G_LIST_MODEL (self));
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if (removed > 0 || added > 0)
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g_list_model_items_changed (G_LIST_MODEL (self), 0, removed, added);
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g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MODEL]);
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}
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/**
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* gtk_selection_filter_model_get_model:
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* @self: a #GtkSelectionFilterModel
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*
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* Gets the model currently filtered or %NULL if none.
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*
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* Returns: (nullable) (transfer none): The model that gets filtered
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**/
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GtkSelectionModel *
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gtk_selection_filter_model_get_model (GtkSelectionFilterModel *self)
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{
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g_return_val_if_fail (GTK_IS_SELECTION_FILTER_MODEL (self), NULL);
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return self->model;
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}
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