Adding upstream version 1.0.2.upstream/1.0.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 888 insertions, 0 deletions

diff --git a/src/ui/tool/multi-path-manipulator.cpp b/src/ui/tool/multi-path-manipulator.cpp
new file mode 100644
index 0000000..bd84cc1
--- /dev/null
+++ b/src/ui/tool/multi-path-manipulator.cpp
@@ -0,0 +1,888 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * @file
+ * Multi path manipulator - implementation.
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <unordered_set>
+
+#include <gdk/gdkkeysyms.h>
+#include <glibmm/i18n.h>
+
+#include "desktop.h"
+#include "document.h"
+#include "document-undo.h"
+#include "message-stack.h"
+#include "node.h"
+#include "verbs.h"
+
+#include "live_effects/lpeobject.h"
+
+#include "object/sp-path.h"
+
+#include "ui/tool/control-point-selection.h"
+#include "ui/tool/event-utils.h"
+#include "ui/tool/multi-path-manipulator.h"
+#include "ui/tool/path-manipulator.h"
+
+
+namespace Inkscape {
+namespace UI {
+
+namespace {
+
+struct hash_nodelist_iterator
+    : public std::unary_function<NodeList::iterator, std::size_t>
+{
+    std::size_t operator()(NodeList::iterator i) const {
+        return std::hash<NodeList::iterator::pointer>()(&*i);
+    }
+};
+
+typedef std::pair<NodeList::iterator, NodeList::iterator> IterPair;
+typedef std::vector<IterPair> IterPairList;
+typedef std::unordered_set<NodeList::iterator, hash_nodelist_iterator> IterSet;
+typedef std::multimap<double, IterPair> DistanceMap;
+typedef std::pair<double, IterPair> DistanceMapItem;
+
+/** Find pairs of selected endnodes suitable for joining. */
+void find_join_iterators(ControlPointSelection &sel, IterPairList &pairs)
+{
+    IterSet join_iters;
+
+    // find all endnodes in selection
+    for (auto i : sel) {
+        Node *node = dynamic_cast<Node*>(i);
+        if (!node) continue;
+        NodeList::iterator iter = NodeList::get_iterator(node);
+        if (!iter.next() || !iter.prev()) join_iters.insert(iter);
+    }
+
+    if (join_iters.size() < 2) return;
+
+    // Below we find the closest pairs. The algorithm is O(N^3).
+    // We can go down to O(N^2 log N) by using O(N^2) memory, by putting all pairs
+    // with their distances in a multimap (not worth it IMO).
+    while (join_iters.size() >= 2) {
+        double closest = DBL_MAX;
+        IterPair closest_pair;
+        for (IterSet::iterator i = join_iters.begin(); i != join_iters.end(); ++i) {
+            for (IterSet::iterator j = join_iters.begin(); j != i; ++j) {
+                double dist = Geom::distance(**i, **j);
+                if (dist < closest) {
+                    closest = dist;
+                    closest_pair = std::make_pair(*i, *j);
+                }
+            }
+        }
+        pairs.push_back(closest_pair);
+        join_iters.erase(closest_pair.first);
+        join_iters.erase(closest_pair.second);
+    }
+}
+
+/** After this function, first should be at the end of path and second at the beginnning.
+ * @returns True if the nodes are in the same subpath */
+bool prepare_join(IterPair &join_iters)
+{
+    if (&NodeList::get(join_iters.first) == &NodeList::get(join_iters.second)) {
+        if (join_iters.first.next()) // if first is begin, swap the iterators
+            std::swap(join_iters.first, join_iters.second);
+        return true;
+    }
+
+    NodeList &sp_first = NodeList::get(join_iters.first);
+    NodeList &sp_second = NodeList::get(join_iters.second);
+    if (join_iters.first.next()) { // first is begin
+        if (join_iters.second.next()) { // second is begin
+            sp_first.reverse();
+        } else { // second is end
+            std::swap(join_iters.first, join_iters.second);
+        }
+    } else { // first is end
+        if (join_iters.second.next()) { // second is begin
+            // do nothing
+        } else { // second is end
+            sp_second.reverse();
+        }
+    }
+    return false;
+}
+} // anonymous namespace
+
+
+MultiPathManipulator::MultiPathManipulator(PathSharedData &data, sigc::connection &chg)
+    : PointManipulator(data.node_data.desktop, *data.node_data.selection)
+    , _path_data(data)
+    , _changed(chg)
+{
+    _selection.signal_commit.connect(
+        sigc::mem_fun(*this, &MultiPathManipulator::_commit));
+    _selection.signal_selection_changed.connect(
+        sigc::hide( sigc::hide(
+            signal_coords_changed.make_slot())));
+}
+
+MultiPathManipulator::~MultiPathManipulator()
+{
+    _mmap.clear();
+}
+
+/** Remove empty manipulators. */
+void MultiPathManipulator::cleanup()
+{
+    for (MapType::iterator i = _mmap.begin(); i != _mmap.end(); ) {
+        if (i->second->empty()) i = _mmap.erase(i);
+        else ++i;
+    }
+}
+
+/**
+ * Change the set of items to edit.
+ *
+ * This method attempts to preserve as much of the state as possible.
+ */
+void MultiPathManipulator::setItems(std::set<ShapeRecord> const &s)
+{
+    std::set<ShapeRecord> shapes(s);
+
+    // iterate over currently edited items, modifying / removing them as necessary
+    for (MapType::iterator i = _mmap.begin(); i != _mmap.end();) {
+        std::set<ShapeRecord>::iterator si = shapes.find(i->first);
+        if (si == shapes.end()) {
+            // This item is no longer supposed to be edited - remove its manipulator
+            i = _mmap.erase(i);
+        } else {
+            ShapeRecord const &sr = i->first;
+            ShapeRecord const &sr_new = *si;
+            // if the shape record differs, replace the key only and modify other values
+            if (sr.edit_transform != sr_new.edit_transform ||
+                sr.role != sr_new.role)
+            {
+                std::shared_ptr<PathManipulator> hold(i->second);
+                if (sr.edit_transform != sr_new.edit_transform)
+                    hold->setControlsTransform(sr_new.edit_transform);
+                if (sr.role != sr_new.role) {
+                    //hold->setOutlineColor(_getOutlineColor(sr_new.role));
+                }
+                i = _mmap.erase(i);
+                _mmap.insert(std::make_pair(sr_new, hold));
+            } else {
+                ++i;
+            }
+            shapes.erase(si); // remove the processed record
+        }
+    }
+
+    // add newly selected items
+    for (const auto & r : shapes) {
+        LivePathEffectObject *lpobj = dynamic_cast<LivePathEffectObject *>(r.object);
+        if (!SP_IS_PATH(r.object) && !lpobj) continue;
+        std::shared_ptr<PathManipulator> newpm(new PathManipulator(*this, (SPPath*) r.object,
+            r.edit_transform, _getOutlineColor(r.role, r.object), r.lpe_key));
+        newpm->showHandles(_show_handles);
+        // always show outlines for clips and masks
+        newpm->showOutline(_show_outline || r.role != SHAPE_ROLE_NORMAL);
+        newpm->showPathDirection(_show_path_direction);
+        newpm->setLiveOutline(_live_outline);
+        newpm->setLiveObjects(_live_objects);
+        _mmap.insert(std::make_pair(r, newpm));
+    }
+}
+
+void MultiPathManipulator::selectSubpaths()
+{
+    if (_selection.empty()) {
+        _selection.selectAll();
+    } else {
+        invokeForAll(&PathManipulator::selectSubpaths);
+    }
+}
+
+void MultiPathManipulator::shiftSelection(int dir)
+{
+    if (empty()) return;
+
+    // 1. find last selected node
+    // 2. select the next node; if the last node or nothing is selected,
+    //    select first node
+    MapType::iterator last_i;
+    SubpathList::iterator last_j;
+    NodeList::iterator last_k;
+    bool anything_found = false;
+    bool anynode_found = false;
+
+    for (MapType::iterator i = _mmap.begin(); i != _mmap.end(); ++i) {
+        SubpathList &sp = i->second->subpathList();
+        for (SubpathList::iterator j = sp.begin(); j != sp.end(); ++j) {
+            anynode_found = true;
+            for (NodeList::iterator k = (*j)->begin(); k != (*j)->end(); ++k) {
+                if (k->selected()) {
+                    last_i = i;
+                    last_j = j;
+                    last_k = k;
+                    anything_found = true;
+                    // when tabbing backwards, we want the first node
+                    if (dir == -1) goto exit_loop;
+                }
+            }
+        }
+    }
+    exit_loop:
+
+    // NOTE: we should not assume the _selection contains only nodes
+    // in future it might also contain handles and other types of control points
+    // this is why we use a flag instead in the loop above, instead of calling
+    // selection.empty()
+    if (!anything_found) {
+        // select first / last node
+        // this should never fail because there must be at least 1 non-empty manipulator
+        if (anynode_found) {
+          if (dir == 1) {
+            _selection.insert((*_mmap.begin()->second->subpathList().begin())->begin().ptr());
+          } else {
+            _selection.insert((--(*--(--_mmap.end())->second->subpathList().end())->end()).ptr());
+          }
+        }
+        return;
+    }
+
+    // three levels deep - w00t!
+    if (dir == 1) {
+        if (++last_k == (*last_j)->end()) {
+            // here, last_k points to the node to be selected
+            ++last_j;
+            if (last_j == last_i->second->subpathList().end()) {
+                ++last_i;
+                if (last_i == _mmap.end()) {
+                    last_i = _mmap.begin();
+                }
+                last_j = last_i->second->subpathList().begin();
+            }
+            last_k = (*last_j)->begin();
+        }
+    } else {
+        if (!last_k || last_k == (*last_j)->begin()) {
+            if (last_j == last_i->second->subpathList().begin()) {
+                if (last_i == _mmap.begin()) {
+                    last_i = _mmap.end();
+                }
+                --last_i;
+                last_j = last_i->second->subpathList().end();
+            }
+            --last_j;
+            last_k = (*last_j)->end();
+        }
+        --last_k;
+    }
+    _selection.clear();
+    _selection.insert(last_k.ptr());
+}
+
+void MultiPathManipulator::invertSelectionInSubpaths()
+{
+    invokeForAll(&PathManipulator::invertSelectionInSubpaths);
+}
+
+void MultiPathManipulator::setNodeType(NodeType type)
+{
+    if (_selection.empty()) return;
+
+    // When all selected nodes are already cusp, retract their handles
+    bool retract_handles = (type == NODE_CUSP);
+
+    for (auto i : _selection) {
+        Node *node = dynamic_cast<Node*>(i);
+        if (node) {
+            retract_handles &= (node->type() == NODE_CUSP);
+            node->setType(type);
+        }
+    }
+
+    if (retract_handles) {
+        for (auto i : _selection) {
+            Node *node = dynamic_cast<Node*>(i);
+            if (node) {
+                node->front()->retract();
+                node->back()->retract();
+            }
+        }
+    }
+
+    _done(retract_handles ? _("Retract handles") : _("Change node type"));
+}
+
+void MultiPathManipulator::setSegmentType(SegmentType type)
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::setSegmentType, type);
+    if (type == SEGMENT_STRAIGHT) {
+        _done(_("Straighten segments"));
+    } else {
+        _done(_("Make segments curves"));
+    }
+}
+
+void MultiPathManipulator::insertNodes()
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::insertNodes);
+    _done(_("Add nodes"));
+}
+void MultiPathManipulator::insertNodesAtExtrema(ExtremumType extremum)
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::insertNodeAtExtremum, extremum);
+    _done(_("Add extremum nodes"));
+}
+
+void MultiPathManipulator::insertNode(Geom::Point pt)
+{
+    // When double clicking to insert nodes, we might not have a selection of nodes (and we don't need one)
+    // so don't check for "_selection.empty()" here, contrary to the other methods above and below this one
+    invokeForAll(&PathManipulator::insertNode, pt);
+    _done(_("Add nodes"));
+}
+
+void MultiPathManipulator::duplicateNodes()
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::duplicateNodes);
+    _done(_("Duplicate nodes"));
+}
+
+void MultiPathManipulator::joinNodes()
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::hideDragPoint);
+    // Node join has two parts. In the first one we join two subpaths by fusing endpoints
+    // into one. In the second we fuse nodes in each subpath.
+    IterPairList joins;
+    NodeList::iterator preserve_pos;
+    Node *mouseover_node = dynamic_cast<Node*>(ControlPoint::mouseovered_point);
+    if (mouseover_node) {
+        preserve_pos = NodeList::get_iterator(mouseover_node);
+    }
+    find_join_iterators(_selection, joins);
+
+    for (auto & join : joins) {
+        bool same_path = prepare_join(join);
+        NodeList &sp_first = NodeList::get(join.first);
+        NodeList &sp_second = NodeList::get(join.second);
+        join.first->setType(NODE_CUSP, false);
+
+        Geom::Point joined_pos, pos_handle_front, pos_handle_back;
+        pos_handle_front = *join.second->front();
+        pos_handle_back = *join.first->back();
+
+        // When we encounter the mouseover node, we unset the iterator - it will be invalidated
+        if (join.first == preserve_pos) {
+            joined_pos = *join.first;
+            preserve_pos = NodeList::iterator();
+        } else if (join.second == preserve_pos) {
+            joined_pos = *join.second;
+            preserve_pos = NodeList::iterator();
+        } else {
+            joined_pos = Geom::middle_point(*join.first, *join.second);
+        }
+
+        // if the handles aren't degenerate, don't move them
+        join.first->move(joined_pos);
+        Node *joined_node = join.first.ptr();
+        if (!join.second->front()->isDegenerate()) {
+            joined_node->front()->setPosition(pos_handle_front);
+        }
+        if (!join.first->back()->isDegenerate()) {
+            joined_node->back()->setPosition(pos_handle_back);
+        }
+        sp_second.erase(join.second);
+
+        if (same_path) {
+            sp_first.setClosed(true);
+        } else {
+            sp_first.splice(sp_first.end(), sp_second);
+            sp_second.kill();
+        }
+        _selection.insert(join.first.ptr());
+    }
+
+    if (joins.empty()) {
+        // Second part replaces contiguous selections of nodes with single nodes
+        invokeForAll(&PathManipulator::weldNodes, preserve_pos);
+    }
+
+    _doneWithCleanup(_("Join nodes"), true);
+}
+
+void MultiPathManipulator::breakNodes()
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::breakNodes);
+    _done(_("Break nodes"), true);
+}
+
+void MultiPathManipulator::deleteNodes(bool keep_shape)
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::deleteNodes, keep_shape);
+    _doneWithCleanup(_("Delete nodes"), true);
+}
+
+/** Join selected endpoints to create segments. */
+void MultiPathManipulator::joinSegments()
+{
+    if (_selection.empty()) return;
+    IterPairList joins;
+    find_join_iterators(_selection, joins);
+
+    for (auto & join : joins) {
+        bool same_path = prepare_join(join);
+        NodeList &sp_first = NodeList::get(join.first);
+        NodeList &sp_second = NodeList::get(join.second);
+        join.first->setType(NODE_CUSP, false);
+        join.second->setType(NODE_CUSP, false);
+        if (same_path) {
+            sp_first.setClosed(true);
+        } else {
+            sp_first.splice(sp_first.end(), sp_second);
+            sp_second.kill();
+        }
+    }
+
+    if (joins.empty()) {
+        invokeForAll(&PathManipulator::weldSegments);
+    }
+    _doneWithCleanup("Join segments", true);
+}
+
+void MultiPathManipulator::deleteSegments()
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::deleteSegments);
+    _doneWithCleanup("Delete segments", true);
+}
+
+void MultiPathManipulator::alignNodes(Geom::Dim2 d)
+{
+    if (_selection.empty()) return;
+    _selection.align(d);
+    if (d == Geom::X) {
+        _done("Align nodes to a horizontal line");
+    } else {
+        _done("Align nodes to a vertical line");
+    }
+}
+
+void MultiPathManipulator::distributeNodes(Geom::Dim2 d)
+{
+    if (_selection.empty()) return;
+    _selection.distribute(d);
+    if (d == Geom::X) {
+        _done("Distribute nodes horizontally");
+    } else {
+        _done("Distribute nodes vertically");
+    }
+}
+
+void MultiPathManipulator::reverseSubpaths()
+{
+    if (_selection.empty()) {
+        invokeForAll(&PathManipulator::reverseSubpaths, false);
+        _done("Reverse subpaths");
+    } else {
+        invokeForAll(&PathManipulator::reverseSubpaths, true);
+        _done("Reverse selected subpaths");
+    }
+}
+
+void MultiPathManipulator::move(Geom::Point const &delta)
+{
+    if (_selection.empty()) return;
+    _selection.transform(Geom::Translate(delta));
+    _done("Move nodes");
+}
+
+void MultiPathManipulator::showOutline(bool show)
+{
+    for (auto & i : _mmap) {
+        // always show outlines for clipping paths and masks
+        i.second->showOutline(show || i.first.role != SHAPE_ROLE_NORMAL);
+    }
+    _show_outline = show;
+}
+
+void MultiPathManipulator::showHandles(bool show)
+{
+    invokeForAll(&PathManipulator::showHandles, show);
+    _show_handles = show;
+}
+
+void MultiPathManipulator::showPathDirection(bool show)
+{
+    invokeForAll(&PathManipulator::showPathDirection, show);
+    _show_path_direction = show;
+}
+
+/**
+ * Set live outline update status.
+ * When set to true, outline will be updated continuously when dragging
+ * or transforming nodes. Otherwise it will only update when changes are committed
+ * to XML.
+ */
+void MultiPathManipulator::setLiveOutline(bool set)
+{
+    invokeForAll(&PathManipulator::setLiveOutline, set);
+    _live_outline = set;
+}
+
+/**
+ * Set live object update status.
+ * When set to true, objects will be updated continuously when dragging
+ * or transforming nodes. Otherwise they will only update when changes are committed
+ * to XML.
+ */
+void MultiPathManipulator::setLiveObjects(bool set)
+{
+    invokeForAll(&PathManipulator::setLiveObjects, set);
+    _live_objects = set;
+}
+
+void MultiPathManipulator::updateOutlineColors()
+{
+    //for (MapType::iterator i = _mmap.begin(); i != _mmap.end(); ++i) {
+    //    i->second->setOutlineColor(_getOutlineColor(i->first.role));
+    //}
+}
+
+void MultiPathManipulator::updateHandles()
+{
+    invokeForAll(&PathManipulator::updateHandles);
+}
+
+bool MultiPathManipulator::event(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event)
+{
+    _tracker.event(event);
+    guint key = 0;
+    if (event->type == GDK_KEY_PRESS) {
+        key = shortcut_key(event->key);
+    }
+
+    // Single handle adjustments go here.
+    if (_selection.size() == 1 && event->type == GDK_KEY_PRESS) {
+        do {
+            Node *n = dynamic_cast<Node *>(*_selection.begin());
+            if (!n) break;
+
+            PathManipulator &pm = n->nodeList().subpathList().pm();
+
+            int which = 0;
+            if (_tracker.rightAlt() || _tracker.rightControl()) {
+                which = 1;
+            }
+            if (_tracker.leftAlt() || _tracker.leftControl()) {
+                if (which != 0) break; // ambiguous
+                which = -1;
+            }
+            if (which == 0) break; // no handle chosen
+            bool one_pixel = _tracker.leftAlt() || _tracker.rightAlt();
+            bool handled = true;
+
+            switch (key) {
+            // single handle functions
+            // rotation
+            case GDK_KEY_bracketleft:
+            case GDK_KEY_braceleft:
+                pm.rotateHandle(n, which, -_desktop->yaxisdir(), one_pixel);
+                break;
+            case GDK_KEY_bracketright:
+            case GDK_KEY_braceright:
+                pm.rotateHandle(n, which, _desktop->yaxisdir(), one_pixel);
+                break;
+            // adjust length
+            case GDK_KEY_period:
+            case GDK_KEY_greater:
+                pm.scaleHandle(n, which, 1, one_pixel);
+                break;
+            case GDK_KEY_comma:
+            case GDK_KEY_less:
+                pm.scaleHandle(n, which, -1, one_pixel);
+                break;
+            default:
+                handled = false;
+                break;
+            }
+
+            if (handled) return true;
+        } while(false);
+    }
+
+
+    switch (event->type) {
+    case GDK_KEY_PRESS:
+        switch (key) {
+        case GDK_KEY_Insert:
+        case GDK_KEY_KP_Insert:
+            // Insert - insert nodes in the middle of selected segments
+            insertNodes();
+            return true;
+        case GDK_KEY_i:
+        case GDK_KEY_I:
+            if (held_only_shift(event->key)) {
+                // Shift+I - insert nodes (alternate keybinding for Mac keyboards
+                //           that don't have the Insert key)
+                insertNodes();
+                return true;
+            }
+            break;
+        case GDK_KEY_d:
+        case GDK_KEY_D:
+            if (held_only_shift(event->key)) {
+                duplicateNodes();
+                return true;
+            }
+        case GDK_KEY_j:
+        case GDK_KEY_J:
+            if (held_only_shift(event->key)) {
+                // Shift+J - join nodes
+                joinNodes();
+                return true;
+            }
+            if (held_only_alt(event->key)) {
+                // Alt+J - join segments
+                joinSegments();
+                return true;
+            }
+            break;
+        case GDK_KEY_b:
+        case GDK_KEY_B:
+            if (held_only_shift(event->key)) {
+                // Shift+B - break nodes
+                breakNodes();
+                return true;
+            }
+            break;
+        case GDK_KEY_Delete:
+        case GDK_KEY_KP_Delete:
+        case GDK_KEY_BackSpace:
+            if (held_shift(event->key)) break;
+            if (held_alt(event->key)) {
+                // Alt+Delete - delete segments
+                deleteSegments();
+            } else {
+                Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+                bool del_preserves_shape = prefs->getBool("/tools/nodes/delete_preserves_shape", true);
+                // pass keep_shape = true when:
+                // a) del preserves shape, and control is not pressed
+                // b) ctrl+del preserves shape (del_preserves_shape is false), and control is pressed
+                // Hence xor
+                guint mode = prefs->getInt("/tools/freehand/pen/freehand-mode", 0);
+
+                //if the trace is bspline ( mode 2)
+                if(mode==2){
+                    //  is this correct ?
+                    if(del_preserves_shape ^ held_control(event->key)){
+                        deleteNodes(false);
+                    } else {
+                        deleteNodes(true);
+                    }
+                } else {
+                    deleteNodes(del_preserves_shape ^ held_control(event->key));
+                }
+
+                // Delete any selected gradient nodes as well
+                event_context->deleteSelectedDrag(held_control(event->key));
+            }
+            return true;
+        case GDK_KEY_c:
+        case GDK_KEY_C:
+            if (held_only_shift(event->key)) {
+                // Shift+C - make nodes cusp
+                setNodeType(NODE_CUSP);
+                return true;
+            }
+            break;
+        case GDK_KEY_s:
+        case GDK_KEY_S:
+            if (held_only_shift(event->key)) {
+                // Shift+S - make nodes smooth
+                setNodeType(NODE_SMOOTH);
+                return true;
+            }
+            break;
+        case GDK_KEY_a:
+        case GDK_KEY_A:
+            if (held_only_shift(event->key)) {
+                // Shift+A - make nodes auto-smooth
+                setNodeType(NODE_AUTO);
+                return true;
+            }
+            break;
+        case GDK_KEY_y:
+        case GDK_KEY_Y:
+            if (held_only_shift(event->key)) {
+                // Shift+Y - make nodes symmetric
+                setNodeType(NODE_SYMMETRIC);
+                return true;
+            }
+            break;
+        case GDK_KEY_r:
+        case GDK_KEY_R:
+            if (held_only_shift(event->key)) {
+                // Shift+R - reverse subpaths
+                reverseSubpaths();
+                return true;
+            }
+            break;
+        case GDK_KEY_l:
+        case GDK_KEY_L:
+            if (held_only_shift(event->key)) {
+                // Shift+L - make segments linear
+                setSegmentType(SEGMENT_STRAIGHT);
+                return true;
+            }
+        case GDK_KEY_u:
+        case GDK_KEY_U:
+            if (held_only_shift(event->key)) {
+                // Shift+U - make segments curves
+                setSegmentType(SEGMENT_CUBIC_BEZIER);
+                return true;
+            }
+        default:
+            break;
+        }
+        break;
+    case GDK_MOTION_NOTIFY:
+        combine_motion_events(_desktop->canvas, event->motion, 0);
+        for (auto & i : _mmap) {
+            if (i.second->event(event_context, event)) return true;
+        }
+        break;
+    default: break;
+    }
+
+    return false;
+}
+
+/** Commit changes to XML and add undo stack entry based on the action that was done. Invoked
+ * by sub-manipulators, for example TransformHandleSet and ControlPointSelection. */
+void MultiPathManipulator::_commit(CommitEvent cps)
+{
+    gchar const *reason = nullptr;
+    gchar const *key = nullptr;
+    switch(cps) {
+    case COMMIT_MOUSE_MOVE:
+        reason = _("Move nodes");
+        break;
+    case COMMIT_KEYBOARD_MOVE_X:
+        reason = _("Move nodes horizontally");
+        key = "node:move:x";
+        break;
+    case COMMIT_KEYBOARD_MOVE_Y:
+        reason = _("Move nodes vertically");
+        key = "node:move:y";
+        break;
+    case COMMIT_MOUSE_ROTATE:
+        reason = _("Rotate nodes");
+        break;
+    case COMMIT_KEYBOARD_ROTATE:
+        reason = _("Rotate nodes");
+        key = "node:rotate";
+        break;
+    case COMMIT_MOUSE_SCALE_UNIFORM:
+        reason = _("Scale nodes uniformly");
+        break;
+    case COMMIT_MOUSE_SCALE:
+        reason = _("Scale nodes");
+        break;
+    case COMMIT_KEYBOARD_SCALE_UNIFORM:
+        reason = _("Scale nodes uniformly");
+        key = "node:scale:uniform";
+        break;
+    case COMMIT_KEYBOARD_SCALE_X:
+        reason = _("Scale nodes horizontally");
+        key = "node:scale:x";
+        break;
+    case COMMIT_KEYBOARD_SCALE_Y:
+        reason = _("Scale nodes vertically");
+        key = "node:scale:y";
+        break;
+    case COMMIT_MOUSE_SKEW_X:
+        reason = _("Skew nodes horizontally");
+        key = "node:skew:x";
+        break;
+    case COMMIT_MOUSE_SKEW_Y:
+        reason = _("Skew nodes vertically");
+        key = "node:skew:y";
+        break;
+    case COMMIT_FLIP_X:
+        reason = _("Flip nodes horizontally");
+        break;
+    case COMMIT_FLIP_Y:
+        reason = _("Flip nodes vertically");
+        break;
+    default: return;
+    }
+
+    _selection.signal_update.emit();
+    invokeForAll(&PathManipulator::writeXML);
+    if (key) {
+        DocumentUndo::maybeDone(_desktop->getDocument(), key, SP_VERB_CONTEXT_NODE, reason);
+    } else {
+        DocumentUndo::done(_desktop->getDocument(), SP_VERB_CONTEXT_NODE, reason);
+    }
+    signal_coords_changed.emit();
+}
+
+/** Commits changes to XML and adds undo stack entry. */
+void MultiPathManipulator::_done(gchar const *reason, bool alert_LPE) {
+    invokeForAll(&PathManipulator::update, alert_LPE);
+    invokeForAll(&PathManipulator::writeXML);
+    DocumentUndo::done(_desktop->getDocument(), SP_VERB_CONTEXT_NODE, reason);
+    signal_coords_changed.emit();
+}
+
+/** Commits changes to XML, adds undo stack entry and removes empty manipulators. */
+void MultiPathManipulator::_doneWithCleanup(gchar const *reason, bool alert_LPE) {
+    _changed.block();
+    _done(reason, alert_LPE);
+    cleanup();
+    _changed.unblock();
+}
+
+/** Get an outline color based on the shape's role (normal, mask, LPE parameter, etc.). */
+guint32 MultiPathManipulator::_getOutlineColor(ShapeRole role, SPObject *object)
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    switch(role) {
+    case SHAPE_ROLE_CLIPPING_PATH:
+        return prefs->getColor("/tools/nodes/clipping_path_color", 0x00ff00ff);
+    case SHAPE_ROLE_MASK:
+        return prefs->getColor("/tools/nodes/mask_color", 0x0000ffff);
+    case SHAPE_ROLE_LPE_PARAM:
+        return prefs->getColor("/tools/nodes/lpe_param_color", 0x009000ff);
+    case SHAPE_ROLE_NORMAL:
+    default:
+        return SP_ITEM(object)->highlight_color();
+    }
+}
+
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  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 :