forked from AuroraMiddleware/gtk
ccac404f28
Before this commit, adding GtkWidgetAction to class private data would require copying the actions to each subclass as they were built or modified. This was convenient in that it is a sort of "copy on write" semantic. However, due to the way that GTypeInstance works with base _init() functions, the "g_class" pointer in GTypeInstance is updated as each _init() function is called. That means you cannot access the subclasses class private data, but only the parent class private data. If instead we use a singly linked list of GtkWidgetAction, each subclass has their own "head" yet all subclasses share the tail of the GtkWidgetAction chain. This creates one bit of complexity though. You need a stable way to know which "bit" is the "enabled" bit of the action so we can track enabled GAction state. That is easily solved by calculating the distance to the end of the chain for a given action so that base classes sort ahead of subclasses. Since the parent class always knows its parent's actions, the position is stable. A new dynamic bitarray helper also helps us avoid allocations in all the current cases (up to 64 actions per widget) and dynamically switches to malloc if that is to ever be exceeded.
95 lines
4.3 KiB
C
95 lines
4.3 KiB
C
/*
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* Copyright © 2011 Canonical Limited
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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 of the licence, 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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* Author: Ryan Lortie <desrt@desrt.ca>
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*/
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#ifndef __GTK_ACTION_MUXER_H__
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#define __GTK_ACTION_MUXER_H__
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#include <gio/gio.h>
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#include "gtkwidget.h"
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G_BEGIN_DECLS
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#define GTK_TYPE_ACTION_MUXER (gtk_action_muxer_get_type ())
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#define GTK_ACTION_MUXER(inst) (G_TYPE_CHECK_INSTANCE_CAST ((inst), \
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GTK_TYPE_ACTION_MUXER, GtkActionMuxer))
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#define GTK_IS_ACTION_MUXER(inst) (G_TYPE_CHECK_INSTANCE_TYPE ((inst), \
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GTK_TYPE_ACTION_MUXER))
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typedef struct _GtkWidgetAction GtkWidgetAction;
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typedef struct _GtkActionMuxer GtkActionMuxer;
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struct _GtkWidgetAction
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{
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GtkWidgetAction *next;
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char *name;
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GType owner;
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const GVariantType *parameter_type;
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GtkWidgetActionActivateFunc activate;
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const GVariantType *state_type;
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GParamSpec *pspec;
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};
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GType gtk_action_muxer_get_type (void);
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GtkActionMuxer * gtk_action_muxer_new (GtkWidget *widget);
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void gtk_action_muxer_insert (GtkActionMuxer *muxer,
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const gchar *prefix,
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GActionGroup *action_group);
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void gtk_action_muxer_remove (GtkActionMuxer *muxer,
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const gchar *prefix);
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GActionGroup * gtk_action_muxer_find (GtkActionMuxer *muxer,
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const char *action_name,
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const char **unprefixed_name);
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GtkActionMuxer * gtk_action_muxer_get_parent (GtkActionMuxer *muxer);
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void gtk_action_muxer_set_parent (GtkActionMuxer *muxer,
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GtkActionMuxer *parent);
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void gtk_action_muxer_set_primary_accel (GtkActionMuxer *muxer,
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const gchar *action_and_target,
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const gchar *primary_accel);
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const gchar * gtk_action_muxer_get_primary_accel (GtkActionMuxer *muxer,
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const gchar *action_and_target);
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void
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gtk_action_muxer_action_enabled_changed (GtkActionMuxer *muxer,
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const char *action_name,
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gboolean enabled);
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void
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gtk_action_muxer_action_state_changed (GtkActionMuxer *muxer,
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const gchar *action_name,
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GVariant *state);
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/* No better place for these... */
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gchar * gtk_print_action_and_target (const gchar *action_namespace,
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const gchar *action_name,
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GVariant *target);
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gchar * gtk_normalise_detailed_action_name (const gchar *detailed_action_name);
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G_END_DECLS
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#endif /* __GTK_ACTION_MUXER_H__ */
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