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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Inkscape::SelectionDescriber - shows messages describing selection
*
* Authors:
* MenTaLguY <mental@rydia.net>
* Jon A. Cruz <jon@joncruz.org>
*
* Copyright (C) 2004 MenTaLguY
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "document.h"
#include "layer-fns.h"
#include "object/sp-item-group.h"
#include "util/find-last-if.h"
#include "xml/repr.h"
// TODO move the documentation comments into the .h file
namespace Inkscape {
namespace {
static 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
*/
static SPObject *next_sibling_layer(SPObject *layer) {
if (layer->parent == nullptr) {
return nullptr;
}
SPObject::ChildrenList &list = layer->parent->children;
auto l = std::find_if(++list.iterator_to(*layer), list.end(), &is_layer);
return l != list.end() ? &*l : nullptr;
}
/** Finds the previous sibling layer for a \a layer
*
* @returns NULL if there are no further layers under a parent
*/
static SPObject *previous_sibling_layer(SPObject *layer) {
using Inkscape::Algorithms::find_last_if;
SPObject::ChildrenList &list = layer->parent->children;
auto l = find_last_if(list.begin(), list.iterator_to(*layer), &is_layer);
return l != list.iterator_to(*layer) ? &*(l) : nullptr;
}
/** Finds the first child of a \a layer
*
* @returns the layer itself if layer has no sublayers
*/
static SPObject *first_descendant_layer(SPObject *layer) {
while (true) {
auto first_descendant = std::find_if(layer->children.begin(), layer->children.end(), &is_layer);
if (first_descendant == layer->children.end()) {
break;
}
layer = &*first_descendant;
}
return layer;
}
/** Finds the last (topmost) child of a \a layer
*
* @returns NULL if layer has no sublayers
*/
static SPObject *last_child_layer(SPObject *layer) {
using Inkscape::Algorithms::find_last_if;
auto l = find_last_if(layer->children.begin(), layer->children.end(), &is_layer);
return l != layer->children.end() ? &*l : nullptr;
}
static SPObject *last_elder_layer(SPObject *root, SPObject *layer) {
using Inkscape::Algorithms::find_last_if;
SPObject *result = nullptr;
while ( layer != root ) {
SPObject *sibling(previous_sibling_layer(layer));
if (sibling) {
result = sibling;
break;
}
layer = layer->parent;
}
return result;
}
}
/** 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
*/
SPObject *next_layer(SPObject *root, SPObject *layer) {
g_return_val_if_fail(layer != nullptr, NULL);
SPObject *result = nullptr;
SPObject *sibling = next_sibling_layer(layer);
if (sibling) {
result = first_descendant_layer(sibling);
} else if ( layer->parent != root ) {
result = layer->parent;
}
return result;
}
/** 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.
*/
SPObject *previous_layer(SPObject *root, SPObject *layer) {
using Inkscape::Algorithms::find_last_if;
g_return_val_if_fail(layer != nullptr, NULL);
SPObject *result = nullptr;
SPObject *child = last_child_layer(layer);
if (child) {
result = child;
} else if ( layer != root ) {
SPObject *sibling = previous_sibling_layer(layer);
if (sibling) {
result = sibling;
} else {
result = last_elder_layer(root, layer->parent);
}
}
return result;
}
/**
* 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
*/
SPObject *create_layer(SPObject *root, SPObject *layer, LayerRelativePosition position) {
SPDocument *document = root->document;
static int layer_suffix=1;
gchar *id=nullptr;
do {
g_free(id);
id = g_strdup_printf("layer%d", layer_suffix++);
} while (document->getObjectById(id));
Inkscape::XML::Document *xml_doc = document->getReprDoc();
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 ( nullptr != child_layer ) {
layer = child_layer;
}
}
if ( root == layer ) {
root->getRepr()->appendChild(repr);
} else {
Inkscape::XML::Node *layer_repr = layer->getRepr();
layer_repr->parent()->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:fileencoding=utf-8:textwidth=99 :
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