/* * Inkscape::SelectionDescriber - shows messages describing selection * * Authors: * MenTaLguY <mental@rydia.net> * * Copyright (C) 2004 MenTaLguY * * Released under GNU GPL, read the file 'COPYING' for more information */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include "document.h" #include "sp-item-group.h" #include "xml/repr.h" #include "util/find-last-if.h" #include "layer-fns.h" namespace Inkscape { namespace { bool is_layer(SPObject &object) { return SP_IS_GROUP(&object) && SP_GROUP(&object)->layerMode() == SPGroup::LAYER; } /** Finds the next sibling layer for a \a layer * * @returns NULL if there are no further layers under a parent */ 00035 SPObject *next_sibling_layer(SPObject *layer) { using std::find_if; return find_if<SPObject::SiblingIterator>( SP_OBJECT_NEXT(layer), NULL, &is_layer ); } /** Finds the previous sibling layer for a \a layer * * @returns NULL if there are no further layers under a parent */ 00047 SPObject *previous_sibling_layer(SPObject *layer) { using Inkscape::Algorithms::find_last_if; SPObject *sibling(find_last_if<SPObject::SiblingIterator>( SP_OBJECT_PARENT(layer)->firstChild(), layer, &is_layer )); return ( sibling != layer ) ? sibling : NULL; } /** Finds the first child of a \a layer * * @returns NULL if layer has no sublayers */ 00061 SPObject *first_descendant_layer(SPObject *layer) { using std::find_if; SPObject *first_descendant=NULL; while (layer) { layer = find_if<SPObject::SiblingIterator>( layer->firstChild(), NULL, &is_layer ); if (layer) { first_descendant = layer; } } return first_descendant; } /** Finds the last (topmost) child of a \a layer * * @returns NULL if layer has no sublayers */ 00081 SPObject *last_child_layer(SPObject *layer) { using Inkscape::Algorithms::find_last_if; return find_last_if<SPObject::SiblingIterator>( layer->firstChild(), NULL, &is_layer ); } SPObject *last_elder_layer(SPObject *root, SPObject *layer) { using Inkscape::Algorithms::find_last_if; while ( layer != root ) { SPObject *sibling(previous_sibling_layer(layer)); if (sibling) { return sibling; } layer = SP_OBJECT_PARENT(layer); } return NULL; } } /** Finds the next layer under \a root, relative to \a layer in * depth-first order. * * @returns NULL if there are no further layers under \a root */ 00110 SPObject *next_layer(SPObject *root, SPObject *layer) { using std::find_if; g_return_val_if_fail(layer != NULL, NULL); SPObject *sibling(next_sibling_layer(layer)); if (sibling) { SPObject *descendant(first_descendant_layer(sibling)); if (descendant) { return descendant; } else { return sibling; } } else { SPObject *parent=SP_OBJECT_PARENT(layer); if ( parent != root ) { return parent; } else { return NULL; } } } /** Finds the previous layer under \a root, relative to \a layer in * depth-first order. * * @returns NULL if there are no prior layers under \a root. */ 00139 SPObject *previous_layer(SPObject *root, SPObject *layer) { using Inkscape::Algorithms::find_last_if; g_return_val_if_fail(layer != NULL, NULL); SPObject *child(last_child_layer(layer)); if (child) { return child; } else if ( layer != root ) { SPObject *sibling(previous_sibling_layer(layer)); if (sibling) { return sibling; } else { return last_elder_layer(root, SP_OBJECT_PARENT(layer)); } } return NULL; } /** * Creates a new layer. Advances to the next layer id indicated * by the string "layerNN", then creates a new group object of * that id with attribute inkscape:groupmode='layer', and finally * appends the new group object to \a root after object \a layer. * * \pre \a root should be either \a layer or an ancestor of it */ 00167 SPObject *create_layer(SPObject *root, SPObject *layer, LayerRelativePosition position) { SPDocument *document=SP_OBJECT_DOCUMENT(root); static int layer_suffix=1; gchar *id=NULL; do { g_free(id); id = g_strdup_printf("layer%d", layer_suffix++); } while (document->getObjectById(id)); Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document); Inkscape::XML::Node *repr = xml_doc->createElement("svg:g"); repr->setAttribute("inkscape:groupmode", "layer"); repr->setAttribute("id", id); g_free(id); if ( LPOS_CHILD == position ) { root = layer; SPObject *child_layer = Inkscape::last_child_layer(layer); if ( NULL != child_layer ) { layer = child_layer; } } if ( root == layer ) { SP_OBJECT_REPR(root)->appendChild(repr); } else { Inkscape::XML::Node *layer_repr=SP_OBJECT_REPR(layer); sp_repr_parent(layer_repr)->addChild(repr, layer_repr); if ( LPOS_BELOW == position ) { SP_ITEM(document->getObjectByRepr(repr))->lowerOne(); } } return document->getObjectByRepr(repr); } } /* 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:encoding=utf-8:textwidth=99 :