1 files changed, 164 insertions, 0 deletions
diff --git a/src/object/sp-switch.cpp b/src/object/sp-switch.cpp
new file mode 100644
index 0000000..6d7c812
--- /dev/null
+++ b/src/object/sp-switch.cpp
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SVG <switch> implementation
+ *
+ * Authors:
+ *   Andrius R. <knutux@gmail.com>
+ *   MenTaLguY  <mental@rydia.net>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 2006 authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <glibmm/i18n.h>
+
+#include "sp-switch.h"
+#include "display/drawing-group.h"
+#include "conditions.h"
+
+#include <sigc++/adaptors/bind.h>
+
+SPSwitch::SPSwitch() : SPGroup() {
+    this->_cached_item = nullptr;
+}
+
+SPSwitch::~SPSwitch() {
+    _releaseLastItem(_cached_item);
+}
+
+SPObject *SPSwitch::_evaluateFirst() {
+    SPObject *first = nullptr;
+
+    for (auto& child: children) {
+        if (SP_IS_ITEM(&child) && sp_item_evaluate(SP_ITEM(&child))) {
+        	first = &child;
+            break;
+        }
+    }
+
+    return first;
+}
+
+std::vector<SPObject*> SPSwitch::_childList(bool add_ref, SPObject::Action action) {
+    if ( action != SPObject::ActionGeneral ) {
+        return this->childList(add_ref, action);
+    }
+
+    SPObject *child = _evaluateFirst();
+    std::vector<SPObject*> x;
+    if (nullptr == child)
+        return x;
+
+    if (add_ref) {
+        //g_object_ref (G_OBJECT (child));
+    	sp_object_ref(child);
+    }
+    x.push_back(child);
+    return x;
+}
+
+const char *SPSwitch::typeName() const {
+    return "switch";
+}
+
+const char *SPSwitch::displayName() const {
+    return _("Conditional Group");
+}
+
+gchar *SPSwitch::description() const {
+    gint len = this->getItemCount();
+    return g_strdup_printf(
+        ngettext(_("of <b>%d</b> object"), _("of <b>%d</b> objects"), len), len);
+}
+
+void SPSwitch::child_added(Inkscape::XML::Node* child, Inkscape::XML::Node* ref) {
+    SPGroup::child_added(child, ref);
+
+    this->_reevaluate(true);
+}
+
+void SPSwitch::remove_child(Inkscape::XML::Node *child) {
+    SPGroup::remove_child(child);
+
+    this->_reevaluate();
+}
+
+void SPSwitch::order_changed (Inkscape::XML::Node *child, Inkscape::XML::Node *old_ref, Inkscape::XML::Node *new_ref)
+{
+    SPGroup::order_changed(child, old_ref, new_ref);
+
+	this->_reevaluate();
+}
+
+void SPSwitch::_reevaluate(bool /*add_to_drawing*/) {
+    SPObject *evaluated_child = _evaluateFirst();
+    if (!evaluated_child || _cached_item == evaluated_child) {
+        return;
+    }
+
+    _releaseLastItem(_cached_item);
+
+    std::vector<SPObject*> item_list = _childList(false, SPObject::ActionShow);
+    for ( std::vector<SPObject*>::const_reverse_iterator iter=item_list.rbegin();iter!=item_list.rend();++iter) {
+        SPObject *o = *iter;
+        if ( !SP_IS_ITEM (o) ) {
+            continue;
+        }
+
+        SPItem * child = SP_ITEM(o);
+        child->setEvaluated(o == evaluated_child);
+    }
+
+    _cached_item = evaluated_child;
+    _release_connection = evaluated_child->connectRelease(sigc::bind(sigc::ptr_fun(&SPSwitch::_releaseItem), this));
+
+    this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
+}
+
+void SPSwitch::_releaseItem(SPObject *obj, SPSwitch *selection)
+{
+    selection->_releaseLastItem(obj);
+}
+
+void SPSwitch::_releaseLastItem(SPObject *obj)
+{
+    if (nullptr == this->_cached_item || this->_cached_item != obj)
+        return;
+
+    this->_release_connection.disconnect();
+    this->_cached_item = nullptr;
+}
+
+void SPSwitch::_showChildren (Inkscape::Drawing &drawing, Inkscape::DrawingItem *ai, unsigned int key, unsigned int flags) {
+    SPObject *evaluated_child = this->_evaluateFirst();
+
+    std::vector<SPObject*> l = this->_childList(false, SPObject::ActionShow);
+
+    for ( std::vector<SPObject*>::const_reverse_iterator iter=l.rbegin();iter!=l.rend();++iter) {
+        SPObject *o = *iter;
+
+        if (SP_IS_ITEM (o)) {
+            SPItem * child = SP_ITEM(o);
+            child->setEvaluated(o == evaluated_child);
+            Inkscape::DrawingItem *ac = child->invoke_show (drawing, key, flags);
+
+            if (ac) {
+                ai->appendChild(ac);
+            }
+        }
+    }
+}
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :