forked from AuroraMiddleware/gtk
445 lines
15 KiB
C
445 lines
15 KiB
C
/*
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* Copyright © 2018 Benjamin Otte
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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: Benjamin Otte <otte@gnome.org>
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*/
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#include "config.h"
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#include "gtkselectionmodel.h"
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#include "gtkintl.h"
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#include "gtkmarshalers.h"
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/**
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* SECTION:gtkselectionmodel
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* @Title: GtkSelectionModel
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* @Short_description: An extension of the list model interface that handles selections
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* @See_also: #GListModel, #GtkSingleSelection
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*
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* #GtkSelectionModel is an interface that extends the #GListModel interface by adding
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* support for selections. This support is then used by widgets using list models to add
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* the ability to select and unselect various items.
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*
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* GTK provides default implementations of the mode common selection modes such as
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* #GtkSingleSelection, so you will only need to implement this interface if you want
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* detailed control about how selections should be handled.
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*
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* A #GtkSelectionModel supports a single boolean per item indicating if an item is selected
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* or not. This can be queried via gtk_selection_model_is_selected(). When the selected
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* state of one or more items changes, the model will emit the
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* #GtkSelectionModel::selection-changed signal by calling the
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* gtk_selection_model_selection_changed() function. The positions given in that signal
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* may have their selection state changed, though that is not a requirement.
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* If new items added to the model via the #GListModel::items-changed signal are selected
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* or not is up to the implementation.
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*
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* Note that items added via #GListModel::items-changed may already be selected
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* and no #GtkSelectionModel::selection-changed will be emitted for them. So to
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* track which items are selected, it is necessary to listen to both signals.
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*
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* Additionally, the interface can expose functionality to select and unselect items.
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* If these functions are implemented, GTK's list widgets will allow users to select and
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* unselect items. However, #GtkSelectionModels are free to only implement them
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* partially or not at all. In that case the widgets will not support the unimplemented
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* operations.
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*
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* When selecting or unselecting is supported by a model, the return values of the
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* selection functions do NOT indicate if selection or unselection happened. They are
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* only meant to indicate complete failure, like when this mode of selecting is not
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* supported by the model.
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*
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* Selections may happen asynchronously, so the only reliable way to find out when an
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* item was selected is to listen to the signals that indicate selection.
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*/
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G_DEFINE_INTERFACE (GtkSelectionModel, gtk_selection_model, G_TYPE_LIST_MODEL)
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enum {
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SELECTION_CHANGED,
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LAST_SIGNAL
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};
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static guint signals[LAST_SIGNAL] = { 0 };
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static gboolean
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gtk_selection_model_default_is_selected (GtkSelectionModel *model,
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guint position)
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{
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return FALSE;
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}
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static gboolean
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gtk_selection_model_default_select_item (GtkSelectionModel *model,
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guint position,
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gboolean exclusive)
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{
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return FALSE;
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}
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static gboolean
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gtk_selection_model_default_unselect_item (GtkSelectionModel *model,
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guint position)
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{
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return FALSE;
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}
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static gboolean
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gtk_selection_model_default_select_range (GtkSelectionModel *model,
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guint position,
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guint n_items,
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gboolean exclusive)
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{
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return FALSE;
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}
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static gboolean
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gtk_selection_model_default_unselect_range (GtkSelectionModel *model,
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guint position,
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guint n_items)
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{
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return FALSE;
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}
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static gboolean
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gtk_selection_model_default_select_callback (GtkSelectionModel *model,
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GtkSelectionCallback callback,
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gpointer data)
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{
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return FALSE;
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}
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static gboolean
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gtk_selection_model_default_unselect_callback (GtkSelectionModel *model,
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GtkSelectionCallback callback,
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gpointer data)
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{
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return FALSE;
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}
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static gboolean
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gtk_selection_model_default_select_all (GtkSelectionModel *model)
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{
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return gtk_selection_model_select_range (model, 0, g_list_model_get_n_items (G_LIST_MODEL (model)), FALSE);
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}
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static gboolean
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gtk_selection_model_default_unselect_all (GtkSelectionModel *model)
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{
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return gtk_selection_model_unselect_range (model, 0, g_list_model_get_n_items (G_LIST_MODEL (model)));
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}
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static void
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gtk_selection_model_default_query_range (GtkSelectionModel *model,
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guint position,
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guint *start_range,
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guint *n_items,
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gboolean *selected)
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{
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*start_range = position;
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if (position >= g_list_model_get_n_items (G_LIST_MODEL (model)))
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{
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*n_items = 0;
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*selected = FALSE;
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}
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else
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{
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*n_items = 1;
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*selected = gtk_selection_model_is_selected (model, position);
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}
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}
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static void
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gtk_selection_model_default_init (GtkSelectionModelInterface *iface)
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{
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iface->is_selected = gtk_selection_model_default_is_selected;
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iface->select_item = gtk_selection_model_default_select_item;
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iface->unselect_item = gtk_selection_model_default_unselect_item;
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iface->select_range = gtk_selection_model_default_select_range;
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iface->unselect_range = gtk_selection_model_default_unselect_range;
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iface->select_all = gtk_selection_model_default_select_all;
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iface->unselect_all = gtk_selection_model_default_unselect_all;
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iface->select_callback = gtk_selection_model_default_select_callback;
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iface->unselect_callback = gtk_selection_model_default_unselect_callback;
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iface->query_range = gtk_selection_model_default_query_range;
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/**
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* GtkSelectionModel::selection-changed
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* @model: a #GtkSelectionModel
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* @position: The first item that may have changed
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* @n_items: number of items with changes
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*
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* Emitted when the selection state of some of the items in @model changes.
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*
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* Note that this signal does not specify the new selection state of the items,
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* they need to be queried manually.
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* It is also not necessary for a model to change the selection state of any of
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* the items in the selection model, though it would be rather useless to emit
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* such a signal.
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*/
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signals[SELECTION_CHANGED] =
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g_signal_new ("selection-changed",
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GTK_TYPE_SELECTION_MODEL,
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G_SIGNAL_RUN_LAST,
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0,
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NULL, NULL,
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_gtk_marshal_VOID__UINT_UINT,
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G_TYPE_NONE, 2, G_TYPE_UINT, G_TYPE_UINT);
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g_signal_set_va_marshaller (signals[SELECTION_CHANGED],
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GTK_TYPE_SELECTION_MODEL,
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_gtk_marshal_VOID__UINT_UINTv);
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}
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/**
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* gtk_selection_model_is_selected:
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* @model: a #GtkSelectionModel
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* @position: the position of the item to query
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*
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* Checks if the given item is selected.
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*
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* Returns: %TRUE if the item is selected
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**/
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gboolean
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gtk_selection_model_is_selected (GtkSelectionModel *model,
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guint position)
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{
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GtkSelectionModelInterface *iface;
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g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), 0);
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iface = GTK_SELECTION_MODEL_GET_IFACE (model);
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return iface->is_selected (model, position);
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}
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/**
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* gtk_selection_model_select_item:
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* @model: a #GtkSelectionModel
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* @position: the position of the item to select
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* @exclusive: whether previously selected items should be unselected
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*
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* Requests to select an item in the model.
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*/
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gboolean
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gtk_selection_model_select_item (GtkSelectionModel *model,
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guint position,
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gboolean exclusive)
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{
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GtkSelectionModelInterface *iface;
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g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), 0);
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iface = GTK_SELECTION_MODEL_GET_IFACE (model);
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return iface->select_item (model, position, exclusive);
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}
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/**
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* gtk_selection_model_unselect_item:
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* @model: a #GtkSelectionModel
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* @position: the position of the item to unselect
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*
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* Requests to unselect an item in the model.
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*/
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gboolean
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gtk_selection_model_unselect_item (GtkSelectionModel *model,
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guint position)
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{
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GtkSelectionModelInterface *iface;
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g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), 0);
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iface = GTK_SELECTION_MODEL_GET_IFACE (model);
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return iface->unselect_item (model, position);
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}
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/**
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* gtk_selection_model_select_range:
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* @model: a #GtkSelectionModel
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* @position: the first item to select
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* @n_items: the number of items to select
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* @exclusive: whether previously selected items should be unselected
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*
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* Requests to select a range of items in the model.
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*/
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gboolean
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gtk_selection_model_select_range (GtkSelectionModel *model,
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guint position,
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guint n_items,
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gboolean exclusive)
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{
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GtkSelectionModelInterface *iface;
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g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), 0);
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iface = GTK_SELECTION_MODEL_GET_IFACE (model);
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return iface->select_range (model, position, n_items, exclusive);
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}
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/**
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* gtk_selection_model_unselect_range:
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* @model: a #GtkSelectionModel
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* @position: the first item to unselect
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* @n_items: the number of items to unselect
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*
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* Requests to unselect a range of items in the model.
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*/
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gboolean
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gtk_selection_model_unselect_range (GtkSelectionModel *model,
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guint position,
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guint n_items)
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{
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GtkSelectionModelInterface *iface;
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g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), 0);
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iface = GTK_SELECTION_MODEL_GET_IFACE (model);
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return iface->unselect_range (model, position, n_items);
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}
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/**
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* gtk_selection_model_select_all:
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* @model: a #GtkSelectionModel
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*
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* Requests to select all items in the model.
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*/
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gboolean
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gtk_selection_model_select_all (GtkSelectionModel *model)
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{
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GtkSelectionModelInterface *iface;
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g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), 0);
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iface = GTK_SELECTION_MODEL_GET_IFACE (model);
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return iface->select_all (model);
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}
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/**
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* gtk_selection_model_unselect_all:
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* @model: a #GtkSelectionModel
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*
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* Requests to unselect all items in the model.
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*/
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gboolean
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gtk_selection_model_unselect_all (GtkSelectionModel *model)
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{
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GtkSelectionModelInterface *iface;
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g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), 0);
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iface = GTK_SELECTION_MODEL_GET_IFACE (model);
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return iface->unselect_all (model);
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}
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/**
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* gtk_selection_model_select_callback:
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* @model: a #GtkSelectionModel
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* @callback: a #GtkSelectionCallback to determine items to select
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* @data: data to pass to @callback
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*
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* Requests to select all items for which @callback returns
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* @selected as TRUE.
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*/
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gboolean
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gtk_selection_model_select_callback (GtkSelectionModel *model,
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GtkSelectionCallback callback,
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gpointer data)
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{
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g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), FALSE);
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return GTK_SELECTION_MODEL_GET_IFACE (model)->select_callback (model, callback, data);
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}
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/**
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* gtk_selection_model_unselect_callback:
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* @model: a #GtkSelectionModel
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* @callback: a #GtkSelectionCallback to determine items to select
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* @data: data to pass to @callback
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*
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* Requests to unselect all items for which @callback returns
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* @selected as TRUE.
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*/
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gboolean
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gtk_selection_model_unselect_callback (GtkSelectionModel *model,
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GtkSelectionCallback callback,
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gpointer data)
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{
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g_return_val_if_fail (GTK_IS_SELECTION_MODEL (model), FALSE);
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return GTK_SELECTION_MODEL_GET_IFACE (model)->unselect_callback (model, callback, data);
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}
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/**
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* gtk_selection_model_query_range:
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* @model: a #GtkSelectionModel
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* @position: the position inside the range
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* @start_range: (out): returns the position of the first element of the range
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* @n_items: (out): returns the size of the range
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* @selected: (out): returns whether items in @range are selected
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*
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* This function allows to query the selection status of multiple elements at once.
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* It is passed a position and returns a range of elements of uniform selection status.
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*
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* If @position is greater than the number of items in @model, @n_items is set to 0.
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* Otherwise the returned range is guaranteed to include the passed-in position, so
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* @n_items will be >= 1.
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*
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* Positions directly adjacent to the returned range may have the same selection
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* status as the returned range.
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*
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* This is an optimization function to make iterating over a model faster when few
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* items are selected. However, it is valid behavior for implementations to use a
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* naive implementation that only ever returns a single element.
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*/
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void
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gtk_selection_model_query_range (GtkSelectionModel *model,
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guint position,
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guint *start_range,
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guint *n_items,
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gboolean *selected)
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{
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GtkSelectionModelInterface *iface;
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g_return_if_fail (GTK_IS_SELECTION_MODEL (model));
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g_return_if_fail (start_range != NULL);
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g_return_if_fail (n_items != NULL);
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g_return_if_fail (selected != NULL);
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iface = GTK_SELECTION_MODEL_GET_IFACE (model);
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return iface->query_range (model, position, start_range, n_items, selected);
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}
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/**
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* gtk_selection_model_selection_changed:
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* @model: a #GtkSelectionModel
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* @position: the first changed item
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* @n_items: the number of changed items
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*
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* Helper function for implementations of #GtkSelectionModel.
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* Call this when a the selection changes to emit the ::selection-changed
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* signal.
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*/
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void
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gtk_selection_model_selection_changed (GtkSelectionModel *model,
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guint position,
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guint n_items)
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{
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g_return_if_fail (GTK_IS_SELECTION_MODEL (model));
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g_return_if_fail (n_items > 0);
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g_return_if_fail (position + n_items <= g_list_model_get_n_items (G_LIST_MODEL (model)));
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g_signal_emit (model, signals[SELECTION_CHANGED], 0, position, n_items);
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}
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