1 /*
2 * The reference corresponding to the inkscape:live-effect attribute
3 *
4 * Copyright (C) 2007 Johan Engelen
5 *
6 * Released under GNU GPL, read the file 'COPYING' for more information.
7 */
9 #include <string.h>
11 #include "enums.h"
12 #include "live_effects/lpeobject-reference.h"
13 #include "live_effects/lpeobject.h"
15 #include "prefs-utils.h"
16 #include "uri.h"
18 namespace Inkscape {
20 namespace LivePathEffect {
22 static void lpeobjectreference_href_changed(SPObject *old_ref, SPObject *ref, LPEObjectReference *lpeobjref);
23 static void lpeobjectreference_delete_self(SPObject *deleted, LPEObjectReference *lpeobjref);
24 static void lpeobjectreference_source_modified(SPObject *iSource, guint flags, LPEObjectReference *lpeobjref);
26 LPEObjectReference::LPEObjectReference(SPObject* i_owner) : URIReference(i_owner)
27 {
28 owner=i_owner;
29 lpeobject_href = NULL;
30 lpeobject_repr = NULL;
31 lpeobject = NULL;
32 _changed_connection = changedSignal().connect(sigc::bind(sigc::ptr_fun(lpeobjectreference_href_changed), this)); // listening to myself, this should be virtual instead
34 user_unlink = NULL;
35 }
37 LPEObjectReference::~LPEObjectReference(void)
38 {
39 _changed_connection.disconnect(); // to do before unlinking
41 quit_listening();
42 unlink();
43 }
45 bool LPEObjectReference::_acceptObject(SPObject * const obj) const
46 {
47 if (IS_LIVEPATHEFFECT(obj)) {
48 SPObject * const owner = getOwner();
49 /* Refuse references to us or to an ancestor. */
50 for ( SPObject *iter = owner ; iter ; iter = SP_OBJECT_PARENT(iter) ) {
51 if ( iter == obj ) {
52 return false;
53 }
54 }
55 return true;
56 } else {
57 return false;
58 }
59 }
61 void
62 LPEObjectReference::link(const char *to)
63 {
64 if ( to == NULL ) {
65 quit_listening();
66 unlink();
67 } else {
68 if ( !lpeobject_href || ( strcmp(to, lpeobject_href) != 0 ) ) {
69 g_free(lpeobject_href);
70 lpeobject_href = g_strdup(to);
71 try {
72 attach(Inkscape::URI(to));
73 } catch (Inkscape::BadURIException &e) {
74 /* TODO: Proper error handling as per
75 * http://www.w3.org/TR/SVG11/implnote.html#ErrorProcessing.
76 */
77 g_warning("%s", e.what());
78 detach();
79 }
80 }
81 }
82 }
84 void
85 LPEObjectReference::unlink(void)
86 {
87 g_free(lpeobject_href);
88 lpeobject_href = NULL;
89 detach();
90 }
92 void
93 LPEObjectReference::start_listening(LivePathEffectObject* to)
94 {
95 if ( to == NULL ) {
96 return;
97 }
98 lpeobject = to;
99 lpeobject_repr = SP_OBJECT_REPR(to);
100 _delete_connection = to->connectDelete(sigc::bind(sigc::ptr_fun(&lpeobjectreference_delete_self), this));
101 _modified_connection = to->connectModified(sigc::bind<2>(sigc::ptr_fun(&lpeobjectreference_source_modified), this));
102 }
104 void
105 LPEObjectReference::quit_listening(void)
106 {
107 if ( lpeobject == NULL ) {
108 return;
109 }
110 _modified_connection.disconnect();
111 _delete_connection.disconnect();
112 lpeobject_repr = NULL;
113 lpeobject = NULL;
114 }
116 static void
117 lpeobjectreference_href_changed(SPObject */*old_ref*/, SPObject */*ref*/, LPEObjectReference *lpeobjref)
118 {
119 lpeobjref->quit_listening();
120 LivePathEffectObject *refobj = LIVEPATHEFFECT( lpeobjref->getObject() );
121 if ( refobj ) {
122 lpeobjref->start_listening(refobj);
123 }
125 lpeobjref->owner->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
126 }
128 static void
129 lpeobjectreference_delete_self(SPObject */*deleted*/, LPEObjectReference *lpeobjref)
130 {
131 guint const mode = prefs_get_int_attribute("options.cloneorphans", "value", SP_CLONE_ORPHANS_UNLINK);
133 if (mode == SP_CLONE_ORPHANS_UNLINK) {
134 // leave it be. just forget about the source
135 lpeobjref->quit_listening();
136 lpeobjref->unlink();
137 if (lpeobjref->user_unlink)
138 lpeobjref->user_unlink(lpeobjref->owner);
139 } else if (mode == SP_CLONE_ORPHANS_DELETE) {
140 lpeobjref->owner->deleteObject();
141 }
142 }
144 static void
145 lpeobjectreference_source_modified(SPObject */*iSource*/, guint /*flags*/, LPEObjectReference *lpeobjref)
146 {
147 lpeobjref->owner->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
148 }
150 } //namespace LivePathEffect
152 } // namespace inkscape
154 /*
155 Local Variables:
156 mode:c++
157 c-file-style:"stroustrup"
158 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
159 indent-tabs-mode:nil
160 fill-column:99
161 End:
162 */
163 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :