Merge from trunk

(bzr r8254.1.53)

1 files changed, 651 insertions, 0 deletions

diff --git a/src/ui/tool/node-tool.cpp b/src/ui/tool/node-tool.cpp
new file mode 100644
index 000000000..443e7f258
--- /dev/null
+++ b/src/ui/tool/node-tool.cpp
@@ -0,0 +1,651 @@
+/** @file
+ * @brief New node tool - implementation
+ */
+/* Authors:
+ *   Krzysztof Kosiński <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->_multipath->showHandles(value->getBool(true));
+    } 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 */
+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:
+            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;
+        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 :