1 /*
2 * SVG <switch> implementation
3 *
4 * Authors:
5 * Andrius R. <knutux@gmail.com>
6 * MenTaLguY <mental@rydia.net>
7 * Jon A. Cruz <jon@joncruz.org>
8 * Abhishek Sharma
9 *
10 * Copyright (C) 2006 authors
11 *
12 * Released under GNU GPL, read the file 'COPYING' for more information
13 */
15 #ifdef HAVE_CONFIG_H
16 # include "config.h"
17 #endif
19 #include <glibmm/i18n.h>
21 #include "sp-switch.h"
22 #include "display/nr-arena-group.h"
23 #include "conditions.h"
25 #include <sigc++/functors/ptr_fun.h>
26 #include <sigc++/adaptors/bind.h>
28 static void sp_switch_class_init (SPSwitchClass *klass);
29 static void sp_switch_init (SPSwitch *group);
31 static SPGroupClass * parent_class;
33 GType CSwitch::getType (void)
34 {
35 static GType switch_type = 0;
36 if (!switch_type) {
37 GTypeInfo switch_info = {
38 sizeof (SPSwitchClass),
39 NULL, /* base_init */
40 NULL, /* base_finalize */
41 (GClassInitFunc) sp_switch_class_init,
42 NULL, /* class_finalize */
43 NULL, /* class_data */
44 sizeof (SPSwitch),
45 16, /* n_preallocs */
46 (GInstanceInitFunc) sp_switch_init,
47 NULL, /* value_table */
48 };
49 switch_type = g_type_register_static (SP_TYPE_GROUP, "SPSwitch", &switch_info, (GTypeFlags)0);
50 }
51 return switch_type;
52 }
54 static void
55 sp_switch_class_init (SPSwitchClass *) {
56 parent_class = (SPGroupClass *)g_type_class_ref (SP_TYPE_GROUP);
57 }
59 static void sp_switch_init (SPSwitch *group)
60 {
61 if (group->group)
62 delete group->group;
64 group->group = new CSwitch(group);
65 }
67 CSwitch::CSwitch(SPGroup *group) : CGroup(group), _cached_item(NULL) {
68 }
70 CSwitch::~CSwitch() {
71 _releaseLastItem(_cached_item);
72 }
74 SPObject *CSwitch::_evaluateFirst() {
75 SPObject *first = 0;
76 for (SPObject *child = _group->firstChild() ; child && !first ; child = child->getNext() ) {
77 if (SP_IS_ITEM(child) && sp_item_evaluate(SP_ITEM(child))) {
78 first = child;
79 }
80 }
81 return first;
82 }
84 GSList *CSwitch::_childList(bool add_ref, SPObject::Action action) {
85 if ( action != SPObject::ActionGeneral ) {
86 return _group->childList(add_ref, action);
87 }
89 SPObject *child = _evaluateFirst();
90 if (NULL == child)
91 return NULL;
93 if (add_ref)
94 g_object_ref (G_OBJECT (child));
96 return g_slist_prepend (NULL, child);
97 }
99 gchar *CSwitch::getDescription() {
100 gint len = getItemCount();
101 return g_strdup_printf(
102 ngettext("<b>Conditional group</b> of <b>%d</b> object",
103 "<b>Conditional group</b> of <b>%d</b> objects",
104 len), len);
105 }
107 void CSwitch::onChildAdded(Inkscape::XML::Node *) {
108 _reevaluate(true);
109 }
111 void CSwitch::onChildRemoved(Inkscape::XML::Node *) {
112 _reevaluate();
113 }
115 void CSwitch::onOrderChanged (Inkscape::XML::Node *, Inkscape::XML::Node *, Inkscape::XML::Node *)
116 {
117 _reevaluate();
118 }
120 void CSwitch::_reevaluate(bool /*add_to_arena*/) {
121 SPObject *evaluated_child = _evaluateFirst();
122 if (!evaluated_child || _cached_item == evaluated_child) {
123 return;
124 }
126 _releaseLastItem(_cached_item);
128 SPItem * child;
129 for ( GSList *l = _childList(false, SPObject::ActionShow);
130 NULL != l ; l = g_slist_remove (l, l->data))
131 {
132 SPObject *o = SP_OBJECT (l->data);
133 if ( !SP_IS_ITEM (o) ) {
134 continue;
135 }
137 child = SP_ITEM (o);
138 child->setEvaluated(o == evaluated_child);
139 }
141 _cached_item = evaluated_child;
142 _release_connection = evaluated_child->connectRelease(sigc::bind(sigc::ptr_fun(&CSwitch::_releaseItem), this));
144 _group->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
145 }
147 void CSwitch::_releaseItem(SPObject *obj, CSwitch *selection)
148 {
149 selection->_releaseLastItem(obj);
150 }
152 void CSwitch::_releaseLastItem(SPObject *obj)
153 {
154 if (NULL == _cached_item || _cached_item != obj)
155 return;
157 _release_connection.disconnect();
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, SPObject::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 = child->invoke_show (arena, key, flags);
174 if (ac) {
175 nr_arena_item_add_child (ai, ac, ar);
176 ar = ac;
177 }
178 }
179 l = g_slist_remove (l, o);
180 }
181 }
183 /*
184 Local Variables:
185 mode:c++
186 c-file-style:"stroustrup"
187 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
188 indent-tabs-mode:nil
189 fill-column:99
190 End:
191 */
192 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :