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Diffstat (limited to 'src/object/sp-tref.cpp')
| -rw-r--r-- | src/object/sp-tref.cpp | 530 |
1 files changed, 530 insertions, 0 deletions
diff --git a/src/object/sp-tref.cpp b/src/object/sp-tref.cpp new file mode 100644 index 0000000..54503ee --- /dev/null +++ b/src/object/sp-tref.cpp @@ -0,0 +1,530 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** \file + * SVG <tref> implementation - All character data within the referenced + * element, including character data enclosed within additional markup, + * will be rendered. + * + * This file was created based on skeleton.cpp + */ +/* + * Authors: + * Gail Banaszkiewicz <Gail.Banaszkiewicz@gmail.com> + * Jon A. Cruz <jon@joncruz.org> + * Abhishek Sharma + * + * Copyright (C) 2007 Gail Banaszkiewicz + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include "sp-tref.h" + +#include <glibmm/i18n.h> + +#include "bad-uri-exception.h" +#include "attributes.h" +#include "document.h" +#include "sp-factory.h" +#include "sp-text.h" +#include "style.h" +#include "text-editing.h" + +//#define DEBUG_TREF +#ifdef DEBUG_TREF +# define debug(f, a...) { g_message("%s(%d) %s:", \ + __FILE__,__LINE__,__FUNCTION__); \ + g_message(f, ## a); \ + g_message("\n"); \ + } +#else +# define debug(f, a...) /**/ +#endif + + +static void build_string_from_root(Inkscape::XML::Node *root, Glib::ustring *retString); + +/* TRef base class */ +static void sp_tref_href_changed(SPObject *old_ref, SPObject *ref, SPTRef *tref); +static void sp_tref_delete_self(SPObject *deleted, SPTRef *self); + +SPTRef::SPTRef() : SPItem() { + this->stringChild = nullptr; + + this->href = nullptr; + this->uriOriginalRef = new SPTRefReference(this); + + this->_changed_connection = + this->uriOriginalRef->changedSignal().connect(sigc::bind(sigc::ptr_fun(sp_tref_href_changed), this)); +} + +SPTRef::~SPTRef() { + delete this->uriOriginalRef; +} + +void SPTRef::build(SPDocument *document, Inkscape::XML::Node *repr) { + SPItem::build(document, repr); + + this->readAttr(SPAttr::XLINK_HREF); + this->readAttr(SPAttr::X); + this->readAttr(SPAttr::Y); + this->readAttr(SPAttr::DX); + this->readAttr(SPAttr::DY); + this->readAttr(SPAttr::ROTATE); +} + +void SPTRef::release() { + //this->attributes.~TextTagAttributes(); + + this->_delete_connection.disconnect(); + this->_changed_connection.disconnect(); + + g_free(this->href); + this->href = nullptr; + + this->uriOriginalRef->detach(); + + SPItem::release(); +} + +void SPTRef::set(SPAttr key, const gchar* value) { + debug("0x%p %s(%u): '%s'",this, + sp_attribute_name(key),key,value ? value : "<no value>"); + + if (this->attributes.readSingleAttribute(key, value, style, &viewport)) { // x, y, dx, dy, rotate + this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + } else if (key == SPAttr::XLINK_HREF) { // xlink:href + if ( !value ) { + // No value + g_free(this->href); + this->href = nullptr; + this->uriOriginalRef->detach(); + } else if ((this->href && strcmp(value, this->href) != 0) || (!this->href)) { + // Value has changed + + if ( this->href ) { + g_free(this->href); + this->href = nullptr; + } + + this->href = g_strdup(value); + + try { + this->uriOriginalRef->attach(Inkscape::URI(value)); + this->uriOriginalRef->updateObserver(); + } catch ( Inkscape::BadURIException &e ) { + g_warning("%s", e.what()); + this->uriOriginalRef->detach(); + } + + // No matter what happened, an update should be in order + this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + } + } else { // default + SPItem::set(key, value); + } +} + +void SPTRef::update(SPCtx *ctx, guint flags) { + debug("0x%p",this); + + unsigned childflags = flags; + if (flags & SP_OBJECT_MODIFIED_FLAG) { + childflags |= SP_OBJECT_PARENT_MODIFIED_FLAG; + } + childflags &= SP_OBJECT_MODIFIED_CASCADE; + + SPObject *child = this->stringChild; + + if (child) { + if ( childflags || ( child->uflags & SP_OBJECT_MODIFIED_FLAG )) { + child->updateDisplay(ctx, childflags); + } + } + + SPItem::update(ctx, flags); +} + +void SPTRef::modified(unsigned int flags) { + if (flags & SP_OBJECT_MODIFIED_FLAG) { + flags |= SP_OBJECT_PARENT_MODIFIED_FLAG; + } + + flags &= SP_OBJECT_MODIFIED_CASCADE; + + SPObject *child = this->stringChild; + + if (child) { + sp_object_ref(child); + + if (flags || (child->mflags & SP_OBJECT_MODIFIED_FLAG)) { + child->emitModified(flags); + } + + sp_object_unref(child); + } +} + +Inkscape::XML::Node* SPTRef::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) { + debug("0x%p",this); + + if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) { + repr = xml_doc->createElement("svg:tref"); + } + + this->attributes.writeTo(repr); + + if (this->uriOriginalRef->getURI()) { + auto uri = this->uriOriginalRef->getURI()->str(); + auto uri_string = uri.c_str(); + debug("uri_string=%s", uri_string); + repr->setAttribute("xlink:href", uri_string); + } + + SPItem::write(xml_doc, repr, flags); + + return repr; +} + +Geom::OptRect SPTRef::bbox(Geom::Affine const &transform, SPItem::BBoxType type) const { + Geom::OptRect bbox; + // find out the ancestor text which holds our layout + SPObject const *parent_text = this; + + while ( parent_text && !SP_IS_TEXT(parent_text) ) { + parent_text = parent_text->parent; + } + + if (parent_text == nullptr) { + return bbox; + } + + // get the bbox of our portion of the layout + return SP_TEXT(parent_text)->layout.bounds(transform, + type == SPItem::VISUAL_BBOX, + sp_text_get_length_upto(parent_text, this), + sp_text_get_length_upto(this, nullptr) - 1); +} + +const char* SPTRef::typeName() const { + return "text-data"; +} + +const char* SPTRef::displayName() const { + return _("Cloned Character Data"); +} + +gchar* SPTRef::description() const { + SPObject const *referred = this->getObjectReferredTo(); + + if (referred) { + char *child_desc; + + if (SP_IS_ITEM(referred)) { + child_desc = SP_ITEM(referred)->detailedDescription(); + } else { + child_desc = g_strdup(""); + } + + char *ret = g_strdup_printf("%s%s", + (SP_IS_ITEM(referred) ? _(" from ") : ""), child_desc); + g_free(child_desc); + + return ret; + } + + return g_strdup(_("[orphaned]")); +} + + +/* For the sigc::connection changes (i.e. when the object being referred to changes) */ +static void +sp_tref_href_changed(SPObject */*old_ref*/, SPObject */*ref*/, SPTRef *tref) +{ + if (tref) + { + // Save a pointer to the original object being referred to + SPObject *refRoot = tref->getObjectReferredTo(); + + tref->_delete_connection.disconnect(); + + if (tref->stringChild) { + tref->detach(tref->stringChild); + tref->stringChild = nullptr; + } + + // Ensure that we are referring to a legitimate object + if (tref->href && refRoot && sp_tref_reference_allowed(tref, refRoot)) { + + // Update the text being referred to (will create a new string child) + sp_tref_update_text(tref); + + // Restore the delete connection now that we're done messing with stuff + tref->_delete_connection = refRoot->connectDelete(sigc::bind(sigc::ptr_fun(&sp_tref_delete_self), tref)); + } + + } +} + + +/** + * Delete the tref object + */ +static void +sp_tref_delete_self(SPObject */*deleted*/, SPTRef *self) +{ + self->deleteObject(); +} + +/** + * Return the object referred to via the URI reference + */ +SPObject * SPTRef::getObjectReferredTo() +{ + SPObject *referredObject = nullptr; + + if (uriOriginalRef) { + referredObject = uriOriginalRef->getObject(); + } + + return referredObject; +} + +/** + * Return the object referred to via the URI reference + */ +SPObject const *SPTRef::getObjectReferredTo() const { + SPObject *referredObject = nullptr; + + if (uriOriginalRef) { + referredObject = uriOriginalRef->getObject(); + } + + return referredObject; +} + + +/** + * Returns true when the given tref is allowed to refer to a particular object + */ +bool +sp_tref_reference_allowed(SPTRef *tref, SPObject *possible_ref) +{ + bool allowed = false; + + if (tref && possible_ref) { + if (tref != possible_ref) { + bool ancestor = false; + for (SPObject *obj = tref; obj; obj = obj->parent) { + if (possible_ref == obj) { + ancestor = true; + break; + } + } + allowed = !ancestor; + } + } + + return allowed; +} + + +/** + * Returns true if a tref is fully contained in the confines of the given + * iterators and layout (or if there is no tref). + */ +bool +sp_tref_fully_contained(SPObject *start_item, Glib::ustring::iterator &start, + SPObject *end_item, Glib::ustring::iterator &end) +{ + bool fully_contained = false; + + if (start_item && end_item) { + + // If neither the beginning or the end is a tref then we return true (whether there + // is a tref in the innards or not, because if there is one then it must be totally + // contained) + if (!(SP_IS_STRING(start_item) && SP_IS_TREF(start_item->parent)) + && !(SP_IS_STRING(end_item) && SP_IS_TREF(end_item->parent))) { + fully_contained = true; + } + + // Both the beginning and end are trefs; but in this case, the string iterators + // must be at the right places + else if ((SP_IS_STRING(start_item) && SP_IS_TREF(start_item->parent)) + && (SP_IS_STRING(end_item) && SP_IS_TREF(end_item->parent))) { + if (start == SP_STRING(start_item)->string.begin() + && end == SP_STRING(start_item)->string.end()) { + fully_contained = true; + } + } + + // If the beginning is a string that is a child of a tref, the iterator has to be + // at the beginning of the item + else if ((SP_IS_STRING(start_item) && SP_IS_TREF(start_item->parent)) + && !(SP_IS_STRING(end_item) && SP_IS_TREF(end_item->parent))) { + if (start == SP_STRING(start_item)->string.begin()) { + fully_contained = true; + } + } + + // Same, but the for the end + else if (!(SP_IS_STRING(start_item) && SP_IS_TREF(start_item->parent)) + && (SP_IS_STRING(end_item) && SP_IS_TREF(end_item->parent))) { + if (end == SP_STRING(start_item)->string.end()) { + fully_contained = true; + } + } + } + + return fully_contained; +} + + +void sp_tref_update_text(SPTRef *tref) +{ + if (tref) { + // Get the character data that will be used with this tref + Glib::ustring charData = ""; + build_string_from_root(tref->getObjectReferredTo()->getRepr(), &charData); + + if (tref->stringChild) { + tref->detach(tref->stringChild); + tref->stringChild = nullptr; + } + + // Create the node and SPString to be the tref's child + Inkscape::XML::Document *xml_doc = tref->document->getReprDoc(); + + Inkscape::XML::Node *newStringRepr = xml_doc->createTextNode(charData.c_str()); + tref->stringChild = SPFactory::createObject(NodeTraits::get_type_string(*newStringRepr)); + + // Add this SPString as a child of the tref + tref->attach(tref->stringChild, tref->lastChild()); + sp_object_unref(tref->stringChild, nullptr); + (tref->stringChild)->invoke_build(tref->document, newStringRepr, TRUE); + + Inkscape::GC::release(newStringRepr); + } +} + + + +/** + * Using depth-first search, build up a string by concatenating all SPStrings + * found in the tree starting at the root + */ +static void +build_string_from_root(Inkscape::XML::Node *root, Glib::ustring *retString) +{ + if (root && retString) { + + // Stop and concatenate when a SPString is found + if (root->type() == Inkscape::XML::NodeType::TEXT_NODE) { + *retString += (root->content()); + + debug("%s", retString->c_str()); + + // Otherwise, continue searching down the tree (with the assumption that no children nodes + // of a SPString are actually legal) + } else { + Inkscape::XML::Node *childNode; + for (childNode = root->firstChild(); childNode; childNode = childNode->next()) { + build_string_from_root(childNode, retString); + } + } + } +} + +/** + * This function will create a new tspan element with the same attributes as + * the tref had and add the same text as a child. The tref is replaced in the + * tree with the new tspan. + * The code is based partially on sp_use_unlink + */ +SPObject * +sp_tref_convert_to_tspan(SPObject *obj) +{ + SPObject * new_tspan = nullptr; + + //////////////////// + // BASE CASE + //////////////////// + if (SP_IS_TREF(obj)) { + + SPTRef *tref = SP_TREF(obj); + + if (tref && tref->stringChild) { + Inkscape::XML::Node *tref_repr = tref->getRepr(); + Inkscape::XML::Node *tref_parent = tref_repr->parent(); + + SPDocument *document = tref->document; + Inkscape::XML::Document *xml_doc = document->getReprDoc(); + + Inkscape::XML::Node *new_tspan_repr = xml_doc->createElement("svg:tspan"); + + // Add the new tspan element just after the current tref + tref_parent->addChild(new_tspan_repr, tref_repr); + Inkscape::GC::release(new_tspan_repr); + + new_tspan = document->getObjectByRepr(new_tspan_repr); + + // Create a new string child for the tspan + Inkscape::XML::Node *new_string_repr = tref->stringChild->getRepr()->duplicate(xml_doc); + new_tspan_repr->addChild(new_string_repr, nullptr); + + //SPObject * new_string_child = document->getObjectByRepr(new_string_repr); + + // Merge style from the tref + new_tspan->style->merge( tref->style ); + new_tspan->style->cascade( new_tspan->parent->style ); + new_tspan->updateRepr(); + + // Hold onto our SPObject and repr for now. + sp_object_ref(tref); + Inkscape::GC::anchor(tref_repr); + + // Remove ourselves, not propagating delete events to avoid a + // chain-reaction with other elements that might reference us. + tref->deleteObject(false); + + // Give the copy our old id and let go of our old repr. + new_tspan_repr->setAttribute("id", tref_repr->attribute("id")); + Inkscape::GC::release(tref_repr); + + // Establish the succession and let go of our object. + tref->setSuccessor(new_tspan); + sp_object_unref(tref); + } + } + //////////////////// + // RECURSIVE CASE + //////////////////// + else { + std::vector<SPObject *> l; + for (auto& child: obj->children) { + sp_object_ref(&child, obj); + l.push_back(&child); + } + for(auto child:l) { + // Note that there may be more than one conversion happening here, so if it's not a + // tref being passed into this function, the returned value can't be specifically known + new_tspan = sp_tref_convert_to_tspan(child); + + sp_object_unref(child, obj); + } + } + + return new_tspan; +} + + +/* + 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 : |