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node-tool.cpp

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/** @file
 * @brief New node tool - implementation
 */
/* Authors:
 *   Krzysztof KosiƄski <tweenk@gmail.com>
 *
 * Copyright (C) 2009 Authors
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#include <glib.h>
#include <glib/gi18n.h>
#include "desktop.h"
#include "desktop-handles.h"
#include "display/canvas-bpath.h"
#include "display/curve.h"
#include "display/sp-canvas.h"
#include "document.h"
#include "live_effects/lpeobject.h"
#include "message-context.h"
#include "selection.h"
#include "shape-editor.h" // temporary!
#include "sp-clippath.h"
#include "sp-item-group.h"
#include "sp-mask.h"
#include "sp-object-group.h"
#include "sp-path.h"
#include "ui/tool/node-tool.h"
#include "ui/tool/control-point-selection.h"
#include "ui/tool/curve-drag-point.h"
#include "ui/tool/event-utils.h"
#include "ui/tool/manipulator.h"
#include "ui/tool/multi-path-manipulator.h"
#include "ui/tool/path-manipulator.h"
#include "ui/tool/selector.h"
#include "ui/tool/shape-record.h"

#include "pixmaps/cursor-node.xpm"
#include "pixmaps/cursor-node-d.xpm"

/** @struct InkNodeTool
 *
 * Node tool event context.
 *
 * @par Architectural overview of the tool
 * @par
 * Here's a breakdown of what each object does.
 * - Handle: shows a handle and keeps the node type constraint (smooth / symmetric) by updating
 *   the other handle's position when dragged. Its move() method cannot violate the constraints.
 * - Node: keeps node type constraints for auto nodes and smooth nodes at ends of linear segments.
 *   Its move() method cannot violate constraints. Handles linear grow and dispatches spatial grow
 *   to MultiPathManipulator. Keeps a reference to its NodeList.
 * - NodeList: exposes an iterator-based interface to nodes. It is possible to obtain an iterator
 *   to a node from the node. Keeps a reference to its SubpathList.
 * - SubpathList: list of NodeLists that represents an editable pathvector. Keeps a reference
 *   to its PathManipulator.
 * - PathManipulator: performs most of the single-path actions like reverse subpaths,
 *   delete segment, shift selection, etc. Keeps a reference to MultiPathManipulator.
 * - MultiPathManipulator: performs additional operations for actions that are not per-path,
 *   for example node joins and segment joins. Tracks the control transforms for PMs that edit
 *   clipping paths and masks. It is more or less equivalent to ShapeEditor and in the future
 *   it might handle all shapes. Handles XML commit of actions that affect all paths or
 *   the node selection and removes PathManipulators that have no nodes left after e.g. node
 *   deletes.
 * - ControlPointSelection: keeps track of node selection and a set of nodes that can potentially
 *   be selected. There can be more than one selection. Performs actions that require no
 *   knowledge about the path, only about the nodes, like dragging and transforms. It is not
 *   specific to nodes and can accomodate any control point derived from SelectableControlPoint.
 *   Transforms nodes in response to transform handle events.
 * - TransformHandleSet: displays nodeset transform handles and emits transform events. The aim
 *   is to eventually use a common class for object and control point transforms.
 * - SelectableControlPoint: base for any type of selectable point. It can belong to only one
 *   selection.
 * 
 * @par Plans for the future
 * @par
 * - MultiPathManipulator should become a generic shape editor that manages all active manipulator,
 *   more or less like the old ShapeEditor.
 * - Knotholder should be rewritten into one manipulator class per shape, using the control point
 *   classes. Interesting features like dragging rectangle sides could be added along the way.
 * - Better handling of clip and mask editing, particularly in response to undo.
 * - High level refactoring of the event context hierarchy. All aspects of tools, like toolbox
 *   controls, icons, event handling should be collected in one class, though each aspect
 *   of a tool might be in an separate class for better modularity. The long term goal is to allow
 *   tools to be defined in extensions or shared library plugins.
 */

namespace {
SPCanvasGroup *create_control_group(SPDesktop *d);
void ink_node_tool_class_init(InkNodeToolClass *klass);
void ink_node_tool_init(InkNodeTool *node_context);
void ink_node_tool_dispose(GObject *object);

void ink_node_tool_setup(SPEventContext *ec);
gint ink_node_tool_root_handler(SPEventContext *event_context, GdkEvent *event);
gint ink_node_tool_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
void ink_node_tool_set(SPEventContext *ec, Inkscape::Preferences::Entry *value);

void ink_node_tool_update_tip(InkNodeTool *nt, GdkEvent *event);
void ink_node_tool_selection_changed(InkNodeTool *nt, Inkscape::Selection *sel);
void ink_node_tool_select_area(InkNodeTool *nt, Geom::Rect const &, GdkEventButton *);
void ink_node_tool_select_point(InkNodeTool *nt, Geom::Point const &, GdkEventButton *);
void ink_node_tool_mouseover_changed(InkNodeTool *nt, Inkscape::UI::ControlPoint *p);
} // anonymous namespace

GType ink_node_tool_get_type()
{
    static GType type = 0;
    if (!type) {
        GTypeInfo info = {
            sizeof(InkNodeToolClass),
            NULL, NULL,
            (GClassInitFunc) ink_node_tool_class_init,
            NULL, NULL,
            sizeof(InkNodeTool),
            4,
            (GInstanceInitFunc) ink_node_tool_init,
            NULL,    /* value_table */
        };
        type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "InkNodeTool", &info, (GTypeFlags)0);
    }
    return type;
}

namespace {

SPCanvasGroup *create_control_group(SPDesktop *d)
{
    return reinterpret_cast<SPCanvasGroup*>(sp_canvas_item_new(
        sp_desktop_controls(d), SP_TYPE_CANVAS_GROUP, NULL));
}

void destroy_group(SPCanvasGroup *g)
{
    gtk_object_destroy(GTK_OBJECT(g));
}

void ink_node_tool_class_init(InkNodeToolClass *klass)
{
    GObjectClass *object_class = (GObjectClass *) klass;
    SPEventContextClass *event_context_class = (SPEventContextClass *) klass;

    object_class->dispose = ink_node_tool_dispose;

    event_context_class->setup = ink_node_tool_setup;
    event_context_class->set = ink_node_tool_set;
    event_context_class->root_handler = ink_node_tool_root_handler;
    event_context_class->item_handler = ink_node_tool_item_handler;
}

void ink_node_tool_init(InkNodeTool *nt)
{
    SPEventContext *event_context = SP_EVENT_CONTEXT(nt);

    event_context->cursor_shape = cursor_node_xpm;
    event_context->hot_x = 1;
    event_context->hot_y = 1;

    new (&nt->_selection_changed_connection) sigc::connection();
    new (&nt->_selection_modified_connection) sigc::connection();
    new (&nt->_mouseover_changed_connection) sigc::connection();
    //new (&nt->_mgroup) Inkscape::UI::ManipulatorGroup(nt->desktop);
    new (&nt->_selected_nodes) CSelPtr();
    new (&nt->_multipath) MultiPathPtr();
    new (&nt->_selector) SelectorPtr();
    new (&nt->_path_data) PathSharedDataPtr();
}

void ink_node_tool_dispose(GObject *object)
{
    InkNodeTool *nt = INK_NODE_TOOL(object);

    nt->enableGrDrag(false);

    nt->_selection_changed_connection.disconnect();
    nt->_selection_modified_connection.disconnect();
    nt->_mouseover_changed_connection.disconnect();
    nt->_multipath.~MultiPathPtr();
    nt->_selected_nodes.~CSelPtr();
    nt->_selector.~SelectorPtr();
    
    Inkscape::UI::PathSharedData &data = *nt->_path_data;
    destroy_group(data.node_data.node_group);
    destroy_group(data.node_data.handle_group);
    destroy_group(data.node_data.handle_line_group);
    destroy_group(data.outline_group);
    destroy_group(data.dragpoint_group);
    destroy_group(nt->_transform_handle_group);
    
    nt->_path_data.~PathSharedDataPtr();
    nt->_selection_changed_connection.~connection();
    nt->_selection_modified_connection.~connection();
    nt->_mouseover_changed_connection.~connection();

    if (nt->_node_message_context) {
        delete nt->_node_message_context;
    }
    if (nt->shape_editor) {
        nt->shape_editor->unset_item(SH_KNOTHOLDER);
        delete nt->shape_editor;
    }

    G_OBJECT_CLASS(g_type_class_peek(g_type_parent(INK_TYPE_NODE_TOOL)))->dispose(object);
}

void ink_node_tool_setup(SPEventContext *ec)
{
    InkNodeTool *nt = INK_NODE_TOOL(ec);

    SPEventContextClass *parent = (SPEventContextClass *) g_type_class_peek(g_type_parent(INK_TYPE_NODE_TOOL));
    if (parent->setup) parent->setup(ec);

    nt->_node_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());

    nt->_path_data.reset(new Inkscape::UI::PathSharedData());
    Inkscape::UI::PathSharedData &data = *nt->_path_data;
    data.node_data.desktop = nt->desktop;

    // selector has to be created here, so that its hidden control point is on the bottom
    nt->_selector.reset(new Inkscape::UI::Selector(nt->desktop));

    // Prepare canvas groups for controls. This guarantees correct z-order, so that
    // for example a dragpoint won't obscure a node
    data.outline_group = create_control_group(nt->desktop);
    data.node_data.handle_line_group = create_control_group(nt->desktop);
    data.dragpoint_group = create_control_group(nt->desktop);
    nt->_transform_handle_group = create_control_group(nt->desktop);
    data.node_data.node_group = create_control_group(nt->desktop);
    data.node_data.handle_group = create_control_group(nt->desktop);

    Inkscape::Selection *selection = sp_desktop_selection (ec->desktop);
    nt->_selection_changed_connection.disconnect();
    nt->_selection_changed_connection =
        selection->connectChanged(
            sigc::bind<0>(
                sigc::ptr_fun(&ink_node_tool_selection_changed),
                nt));
    /*nt->_selection_modified_connection.disconnect();
    nt->_selection_modified_connection =
        selection->connectModified(
            sigc::hide(sigc::bind<0>(
                sigc::ptr_fun(&ink_node_tool_selection_modified),
                nt)));*/
    nt->_mouseover_changed_connection.disconnect();
    nt->_mouseover_changed_connection = 
        Inkscape::UI::ControlPoint::signal_mouseover_change.connect(
            sigc::bind<0>(
                sigc::ptr_fun(&ink_node_tool_mouseover_changed),
                nt));
    
    nt->_selected_nodes.reset(
        new Inkscape::UI::ControlPointSelection(nt->desktop, nt->_transform_handle_group));
    data.node_data.selection = nt->_selected_nodes.get();
    nt->_multipath.reset(new Inkscape::UI::MultiPathManipulator(data,
        nt->_selection_changed_connection));

    nt->_selector->signal_point.connect(
        sigc::bind<0>(
            sigc::ptr_fun(&ink_node_tool_select_point),
            nt));
    nt->_selector->signal_area.connect(
        sigc::bind<0>(
            sigc::ptr_fun(&ink_node_tool_select_area),
            nt));

    nt->_multipath->signal_coords_changed.connect(
        sigc::bind(
            sigc::mem_fun(*nt->desktop, &SPDesktop::emitToolSubselectionChanged),
            (void*) 0));
    nt->_selected_nodes->signal_point_changed.connect(
        sigc::hide( sigc::hide(
            sigc::bind(
                sigc::bind(
                    sigc::ptr_fun(ink_node_tool_update_tip),
                    (GdkEvent*)0),
                nt))));

    nt->cursor_drag = false;
    nt->show_transform_handles = true;
    nt->single_node_transform_handles = false;
    nt->flash_tempitem = NULL;
    nt->flashed_item = NULL;
    nt->_last_over = NULL;
    // TODO long term, fold ShapeEditor into MultiPathManipulator and rename MPM
    // to something better
    nt->shape_editor = new ShapeEditor(nt->desktop);

    // read prefs before adding items to selection to prevent momentarily showing the outline
    sp_event_context_read(nt, "show_handles");
    sp_event_context_read(nt, "show_outline");
    sp_event_context_read(nt, "live_outline");
    sp_event_context_read(nt, "live_objects");
    sp_event_context_read(nt, "show_path_direction");
    sp_event_context_read(nt, "show_transform_handles");
    sp_event_context_read(nt, "single_node_transform_handles");
    sp_event_context_read(nt, "edit_clipping_paths");
    sp_event_context_read(nt, "edit_masks");

    ink_node_tool_selection_changed(nt, selection);
    ink_node_tool_update_tip(nt, NULL);

    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    if (prefs->getBool("/tools/nodes/selcue")) {
        ec->enableSelectionCue();
    }
    if (prefs->getBool("/tools/nodes/gradientdrag")) {
        ec->enableGrDrag();
    }

    nt->desktop->emitToolSubselectionChanged(NULL); // sets the coord entry fields to inactive
}

void ink_node_tool_set(SPEventContext *ec, Inkscape::Preferences::Entry *value)
{
    InkNodeTool *nt = INK_NODE_TOOL(ec);
    Glib::ustring entry_name = value->getEntryName();

    if (entry_name == "show_handles") {
        nt->show_handles = value->getBool(true);
        nt->_multipath->showHandles(nt->show_handles);
    } else if (entry_name == "show_outline") {
        nt->show_outline = value->getBool();
        nt->_multipath->showOutline(nt->show_outline);
    } else if (entry_name == "live_outline") {
        nt->live_outline = value->getBool();
        nt->_multipath->setLiveOutline(nt->live_outline);
    } else if (entry_name == "live_objects") {
        nt->live_objects = value->getBool();
        nt->_multipath->setLiveObjects(nt->live_objects);
    } else if (entry_name == "show_path_direction") {
        nt->show_path_direction = value->getBool();
        nt->_multipath->showPathDirection(nt->show_path_direction);
    } else if (entry_name == "show_transform_handles") {
        nt->show_transform_handles = value->getBool(true);
        nt->_selected_nodes->showTransformHandles(
            nt->show_transform_handles, nt->single_node_transform_handles);
    } else if (entry_name == "single_node_transform_handles") {
        nt->single_node_transform_handles = value->getBool();
        nt->_selected_nodes->showTransformHandles(
            nt->show_transform_handles, nt->single_node_transform_handles);
    } else if (entry_name == "edit_clipping_paths") {
        nt->edit_clipping_paths = value->getBool();
        ink_node_tool_selection_changed(nt, nt->desktop->selection);
    } else if (entry_name == "edit_masks") {
        nt->edit_masks = value->getBool();
        ink_node_tool_selection_changed(nt, nt->desktop->selection);
    } else {
        SPEventContextClass *parent_class =
            (SPEventContextClass *) g_type_class_peek(g_type_parent(INK_TYPE_NODE_TOOL));
        if (parent_class->set)
            parent_class->set(ec, value);
    }
}

/** Recursively collect ShapeRecords */
00356 void gather_items(InkNodeTool *nt, SPItem *base, SPObject *obj, Inkscape::UI::ShapeRole role,
    std::set<Inkscape::UI::ShapeRecord> &s)
{
    using namespace Inkscape::UI;
    if (!obj) return;

    if (SP_IS_PATH(obj) && obj->repr->attribute("inkscape:original-d") != NULL) {
        ShapeRecord r;
        r.item = static_cast<SPItem*>(obj);
        r.edit_transform = Geom::identity(); // TODO wrong?
        r.role = role;
        s.insert(r);
    } else if (role != SHAPE_ROLE_NORMAL && (SP_IS_GROUP(obj) || SP_IS_OBJECTGROUP(obj))) {
        for (SPObject *c = obj->children; c; c = c->next) {
            gather_items(nt, base, c, role, s);
        }
    } else if (SP_IS_ITEM(obj)) {
        SPItem *item = static_cast<SPItem*>(obj);
        ShapeRecord r;
        r.item = item;
        // TODO add support for objectBoundingBox
        r.edit_transform = base ? sp_item_i2doc_affine(base) : Geom::identity();
        r.role = role;
        if (s.insert(r).second) {
            // this item was encountered the first time
            if (nt->edit_clipping_paths && item->clip_ref) {
                gather_items(nt, item, item->clip_ref->getObject(), SHAPE_ROLE_CLIPPING_PATH, s);
            }
            if (nt->edit_masks && item->mask_ref) {
                gather_items(nt, item, item->mask_ref->getObject(), SHAPE_ROLE_MASK, s);
            }
        }
    }
}

void ink_node_tool_selection_changed(InkNodeTool *nt, Inkscape::Selection *sel)
{
    using namespace Inkscape::UI;

    std::set<ShapeRecord> shapes;

    GSList const *ilist = sel->itemList();

    for (GSList *i = const_cast<GSList*>(ilist); i; i = i->next) {
        SPObject *obj = static_cast<SPObject*>(i->data);
        if (SP_IS_ITEM(obj)) {
            gather_items(nt, NULL, static_cast<SPItem*>(obj), SHAPE_ROLE_NORMAL, shapes);
        }
    }

    // ugly hack: set the first editable non-path item for knotholder
    // maybe use multiple ShapeEditors for now, to allow editing many shapes at once?
    bool something_set = false;
    for (std::set<ShapeRecord>::iterator i = shapes.begin(); i != shapes.end(); ++i) {
        ShapeRecord const &r = *i;
        if (SP_IS_SHAPE(r.item) ||
            (SP_IS_PATH(r.item) && r.item->repr->attribute("inkscape:original-d") != NULL))
        {
            nt->shape_editor->set_item(r.item, SH_KNOTHOLDER);
            something_set = true;
            break;
        }
    }
    if (!something_set) {
        nt->shape_editor->unset_item(SH_KNOTHOLDER);
    }

    nt->_multipath->setItems(shapes);
    ink_node_tool_update_tip(nt, NULL);
    nt->desktop->updateNow();
}

gint ink_node_tool_root_handler(SPEventContext *event_context, GdkEvent *event)
{
    /* things to handle here:
     * 1. selection of items
     * 2. passing events to manipulators
     * 3. some keybindings
     */
    using namespace Inkscape::UI; // pull in event helpers
    
    SPDesktop *desktop = event_context->desktop;
    Inkscape::Selection *selection = desktop->selection;
    InkNodeTool *nt = static_cast<InkNodeTool*>(event_context);
    static Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    
    if (nt->_multipath->event(event)) return true;
    if (nt->_selector->event(event)) return true;
    if (nt->_selected_nodes->event(event)) return true;

    switch (event->type)
    {
    case GDK_MOTION_NOTIFY: {
        combine_motion_events(desktop->canvas, event->motion, 0);
        SPItem *over_item = sp_event_context_find_item (desktop, event_point(event->button),
                FALSE, TRUE);
        if (over_item != nt->_last_over) {
            nt->_last_over = over_item;
            ink_node_tool_update_tip(nt, event);
        }

        // create pathflash outline
        if (prefs->getBool("/tools/nodes/pathflash_enabled")) {
            if (over_item == nt->flashed_item) break;
            if (!prefs->getBool("/tools/nodes/pathflash_selected") && selection->includes(over_item)) break;
            if (nt->flash_tempitem) {
                desktop->remove_temporary_canvasitem(nt->flash_tempitem);
                nt->flash_tempitem = NULL;
                nt->flashed_item = NULL;
            }
            if (!SP_IS_PATH(over_item)) break; // for now, handle only paths

            nt->flashed_item = over_item;
            SPCurve *c = sp_path_get_curve_for_edit(SP_PATH(over_item));
            c->transform(sp_item_i2d_affine(over_item));
            SPCanvasItem *flash = sp_canvas_bpath_new(sp_desktop_tempgroup(desktop), c);
            sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(flash),
                prefs->getInt("/tools/nodes/highlight_color", 0xff0000ff), 1.0,
                SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
            sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(flash), 0, SP_WIND_RULE_NONZERO);
            nt->flash_tempitem = desktop->add_temporary_canvasitem(flash,
                prefs->getInt("/tools/nodes/pathflash_timeout", 500));
            c->unref();
        }
        } break; // do not return true, because we need to pass this event to the parent context
        // otherwise some features cease to work

    case GDK_KEY_PRESS:
        switch (get_group0_keyval(&event->key))
        {
        case GDK_Escape: // deselect everything
            if (nt->_selected_nodes->empty()) {
                selection->clear();
            } else {
                nt->_selected_nodes->clear();
            }
            ink_node_tool_update_tip(nt, event);
            return TRUE;
        case GDK_a:
        case GDK_A:
            if (held_control(event->key) && held_alt(event->key)) {
                nt->_selected_nodes->selectAll();
                // Ctrl+A is handled in selection-chemistry.cpp via verb
                ink_node_tool_update_tip(nt, event);
                return TRUE;
            }
            break;
        case GDK_h:
        case GDK_H:
            if (held_only_control(event->key)) {
                Inkscape::Preferences *prefs = Inkscape::Preferences::get();
                prefs->setBool("/tools/nodes/show_handles", !nt->show_handles);
                return TRUE;
            }
            break;
        default:
            break;
        }
        ink_node_tool_update_tip(nt, event);
        break;
    case GDK_KEY_RELEASE:
        ink_node_tool_update_tip(nt, event);
        break;
    default: break;
    }
    
    SPEventContextClass *parent_class = (SPEventContextClass *) g_type_class_peek(g_type_parent(INK_TYPE_NODE_TOOL));
    if (parent_class->root_handler)
        return parent_class->root_handler(event_context, event);
    return FALSE;
}

void ink_node_tool_update_tip(InkNodeTool *nt, GdkEvent *event)
{
    using namespace Inkscape::UI;
    if (event && (event->type == GDK_KEY_PRESS || event->type == GDK_KEY_RELEASE)) {
        unsigned new_state = state_after_event(event);
        if (new_state == event->key.state) return;
        if (state_held_shift(new_state)) {
            if (nt->_last_over) {
                nt->_node_message_context->set(Inkscape::NORMAL_MESSAGE,
                    C_("Node tool tip", "<b>Shift</b>: drag to add nodes to the selection, "
                    "click to toggle object selection"));
            } else {
                nt->_node_message_context->set(Inkscape::NORMAL_MESSAGE,
                    C_("Node tool tip", "<b>Shift</b>: drag to add nodes to the selection"));
            }
            return;
        }
    }
    unsigned sz = nt->_selected_nodes->size();
    unsigned total = nt->_selected_nodes->allPoints().size();
    if (sz != 0) {
        if (nt->_last_over) {
            char *dyntip = g_strdup_printf(C_("Node tool tip",
                "<b>%u of %u nodes</b> selected. "
                "Drag to select nodes, click to edit only this object (more: Shift)"), sz, total);
            nt->_node_message_context->set(Inkscape::NORMAL_MESSAGE, dyntip);
            g_free(dyntip);
        } else {
            char *dyntip = g_strdup_printf(C_("Node tool tip",
                "<b>%u of %u nodes</b> selected. "
                "Drag to select nodes, click clear the selection"), sz, total);
            nt->_node_message_context->set(Inkscape::NORMAL_MESSAGE, dyntip);
            g_free(dyntip);
        }
    } else if (!nt->_multipath->empty()) {
        if (nt->_last_over) {
            nt->_node_message_context->set(Inkscape::NORMAL_MESSAGE, C_("Node tool tip",
                "Drag to select nodes, click to edit only this object"));
        } else {
            nt->_node_message_context->set(Inkscape::NORMAL_MESSAGE, C_("Node tool tip",
                "Drag to select nodes, click to clear the selection"));
        }
    } else {
        if (nt->_last_over) {
            nt->_node_message_context->set(Inkscape::NORMAL_MESSAGE, C_("Node tool tip",
                "Drag to select objects to edit, click to edit this object (more: Shift)"));
        } else {
            nt->_node_message_context->set(Inkscape::NORMAL_MESSAGE, C_("Node tool tip",
                "Drag to select objects to edit"));
        }
    }
}

gint ink_node_tool_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
{
    SPEventContextClass *parent_class =
        (SPEventContextClass *) g_type_class_peek(g_type_parent(INK_TYPE_NODE_TOOL));
    if (parent_class->item_handler)
        return parent_class->item_handler(event_context, item, event);
    return FALSE;
}

void ink_node_tool_select_area(InkNodeTool *nt, Geom::Rect const &sel, GdkEventButton *event)
{
    using namespace Inkscape::UI;
    if (nt->_multipath->empty()) {
        // if multipath is empty, select rubberbanded items rather than nodes
        Inkscape::Selection *selection = nt->desktop->selection;
        GSList *items = sp_document_items_in_box(
            sp_desktop_document(nt->desktop), nt->desktop->dkey, sel);
        selection->setList(items);
        g_slist_free(items);
    } else {
        if (!held_shift(*event)) nt->_selected_nodes->clear();
        nt->_selected_nodes->selectArea(sel);
    }
}
void ink_node_tool_select_point(InkNodeTool *nt, Geom::Point const &/*sel*/, GdkEventButton *event)
{
    using namespace Inkscape::UI; // pull in event helpers
    if (!event) return;
    if (event->button != 1) return;

    Inkscape::Selection *selection = nt->desktop->selection;

    SPItem *item_clicked = sp_event_context_find_item (nt->desktop, event_point(*event),
                    (event->state & GDK_MOD1_MASK) && !(event->state & GDK_CONTROL_MASK), TRUE);

    if (item_clicked == NULL) { // nothing under cursor
        // if no Shift, deselect
        if (!(event->state & GDK_SHIFT_MASK)) {
            selection->clear();
        }
    } else {
        if (held_shift(*event)) {
            selection->toggle(item_clicked);
        } else {
            selection->set(item_clicked);
        }
        nt->desktop->updateNow();
    }
}

void ink_node_tool_mouseover_changed(InkNodeTool *nt, Inkscape::UI::ControlPoint *p)
{
    using Inkscape::UI::CurveDragPoint;
    CurveDragPoint *cdp = dynamic_cast<CurveDragPoint*>(p);
    if (cdp && !nt->cursor_drag) {
        nt->cursor_shape = cursor_node_d_xpm;
        nt->hot_x = 1;
        nt->hot_y = 1;
        sp_event_context_update_cursor(nt);
        nt->cursor_drag = true;
    } else if (!cdp && nt->cursor_drag) {
        nt->cursor_shape = cursor_node_xpm;
        nt->hot_x = 1;
        nt->hot_y = 1;
        sp_event_context_update_cursor(nt);
        nt->cursor_drag = false;
    }
}

} // anonymous namespace

/*
  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 :

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