1 #define __SP_SWITCH_CPP__
3 /*
4 * SVG <switch> implementation
5 *
6 * Authors:
7 * Andrius R. <knutux@gmail.com>
8 *
9 * Copyright (C) 2006 authors
10 *
11 * Released under GNU GPL, read the file 'COPYING' for more information
12 */
14 #ifdef HAVE_CONFIG_H
15 # include "config.h"
16 #endif
18 #if defined(WIN32) || defined(__APPLE__)
19 # include <glibmm/i18n.h>
20 #endif
22 #include "sp-switch.h"
23 #include "display/nr-arena-group.h"
24 #include "conditions.h"
26 static void sp_switch_class_init (SPSwitchClass *klass);
27 static void sp_switch_init (SPSwitch *group);
29 static SPGroupClass * parent_class;
31 GType CSwitch::getType (void)
32 {
33 static GType switch_type = 0;
34 if (!switch_type) {
35 GTypeInfo switch_info = {
36 sizeof (SPSwitchClass),
37 NULL, /* base_init */
38 NULL, /* base_finalize */
39 (GClassInitFunc) sp_switch_class_init,
40 NULL, /* class_finalize */
41 NULL, /* class_data */
42 sizeof (SPSwitch),
43 16, /* n_preallocs */
44 (GInstanceInitFunc) sp_switch_init,
45 NULL, /* value_table */
46 };
47 switch_type = g_type_register_static (SP_TYPE_GROUP, "SPSwitch", &switch_info, (GTypeFlags)0);
48 }
49 return switch_type;
50 }
52 static void
53 sp_switch_class_init (SPSwitchClass *) {
54 parent_class = (SPGroupClass *)g_type_class_ref (SP_TYPE_GROUP);
55 }
57 static void sp_switch_init (SPSwitch *group)
58 {
59 if (group->group)
60 delete group->group;
62 group->group = new CSwitch(group);
63 }
65 CSwitch::CSwitch(SPGroup *group) : CGroup(group), _cached_item(NULL), _release_handler_id(0) {
66 }
68 CSwitch::~CSwitch() {
69 _releaseLastItem(_cached_item);
70 }
72 SPObject *CSwitch::_evaluateFirst() {
73 for (SPObject *child = sp_object_first_child(_group) ; child != NULL ; child = SP_OBJECT_NEXT(child) ) {
74 if (SP_IS_ITEM(child) && sp_item_evaluate(SP_ITEM(child)))
75 return child;
76 }
77 return NULL;
78 }
80 GSList *CSwitch::_childList(bool add_ref, Action action) {
81 if ( ActionGeneral != action ) {
82 return CGroup::_childList(add_ref, action);
83 }
85 SPObject *child = _evaluateFirst();
86 if (NULL == child)
87 return NULL;
89 if (add_ref)
90 g_object_ref (G_OBJECT (child));
92 return g_slist_prepend (NULL, child);
93 }
95 gchar *CSwitch::getDescription() {
96 gint len = getItemCount();
97 return g_strdup_printf(
98 ngettext("<b>Conditional group</b> of <b>%d</b> object",
99 "<b>Conditional group</b> of <b>%d</b> objects",
100 len), len);
101 }
103 void CSwitch::onChildAdded(Inkscape::XML::Node *) {
104 _reevaluate(true);
105 }
107 void CSwitch::onChildRemoved(Inkscape::XML::Node *) {
108 _reevaluate();
109 }
111 void CSwitch::onOrderChanged (Inkscape::XML::Node *, Inkscape::XML::Node *, Inkscape::XML::Node *)
112 {
113 _reevaluate();
114 }
116 void CSwitch::_reevaluate(bool add_to_arena) {
117 SPObject *evaluated_child = _evaluateFirst();
118 if (!evaluated_child || _cached_item == evaluated_child) {
119 return;
120 }
122 _releaseLastItem(_cached_item);
124 SPItem * child;
125 for ( GSList *l = _childList(false, ActionShow);
126 NULL != l ; l = g_slist_remove (l, l->data))
127 {
128 SPObject *o = SP_OBJECT (l->data);
129 if ( !SP_IS_ITEM (o) ) {
130 continue;
131 }
133 child = SP_ITEM (o);
134 child->setEvaluated(o == evaluated_child);
135 }
137 _cached_item = evaluated_child;
138 _release_handler_id = g_signal_connect(
139 G_OBJECT(evaluated_child), "release",
140 G_CALLBACK(&CSwitch::_releaseItem),
141 this);
143 _group->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
144 }
146 void CSwitch::_releaseItem(SPObject *obj, CSwitch *selection)
147 {
148 selection->_releaseLastItem(obj);
149 }
151 void CSwitch::_releaseLastItem(SPObject *obj)
152 {
153 if (NULL == _cached_item || _cached_item != obj)
154 return;
156 g_signal_handler_disconnect(G_OBJECT(_cached_item), _release_handler_id);
157 _release_handler_id = 0;
158 _cached_item = NULL;
159 }
161 void CSwitch::_showChildren (NRArena *arena, NRArenaItem *ai, unsigned int key, unsigned int flags) {
162 SPObject *evaluated_child = _evaluateFirst();
164 NRArenaItem *ac = NULL;
165 NRArenaItem *ar = NULL;
166 SPItem * child;
167 GSList *l = _childList(false, ActionShow);
168 while (l) {
169 SPObject *o = SP_OBJECT (l->data);
170 if (SP_IS_ITEM (o)) {
171 child = SP_ITEM (o);
172 child->setEvaluated(o == evaluated_child);
173 ac = sp_item_invoke_show (child, arena, key, flags);
174 if (ac) {
175 nr_arena_item_add_child (ai, ac, ar);
176 ar = ac;
177 nr_arena_item_unref (ac);
178 }
179 }
180 l = g_slist_remove (l, o);
181 }
182 }