src/connector-context.cpp

   1 /*
   2  * Connector creation tool
   3  *
   4  * Authors:
   5  *   Michael Wybrow <mjwybrow@users.sourceforge.net>
   6  *
   7  * Copyright (C) 2005-2008  Michael Wybrow
   8  * Copyright (C) 2009  Monash University
   9  *
  10  * Released under GNU GPL, read the file 'COPYING' for more information
  11  *
  12  * TODO:
  13  *  o  Show a visual indicator for objects with the 'avoid' property set.
  14  *  o  Allow user to change a object between a path and connector through
  15  *     the interface.
  16  *  o  Create an interface for setting markers (arrow heads).
  17  *  o  Better distinguish between paths and connectors to prevent problems
  18  *     in the node tool and paths accidentally being turned into connectors
  19  *     in the connector tool.  Perhaps have a way to convert between.
  20  *  o  Only call libavoid's updateEndPoint as required.  Currently we do it
  21  *     for both endpoints, even if only one is moving.
  22  *  o  Allow user-placeable connection points.
  23  *  o  Deal sanely with connectors with both endpoints attached to the
  24  *     same connection point, and drawing of connectors attaching
  25  *     overlapping shapes (currently tries to adjust connector to be
  26  *     outside both bounding boxes).
  27  *  o  Fix many special cases related to connectors updating,
  28  *     e.g., copying a couple of shapes and a connector that are
  29  *           attached to each other.
  30  *     e.g., detach connector when it is moved or transformed in
  31  *           one of the other contexts.
  32  *  o  Cope with shapes whose ids change when they have attached
  33  *     connectors.
  34  *  o  During dragging motion, gobble up to and use the final motion event.
  35  *     Gobbling away all duplicates after the current can occasionally result
  36  *     in the path lagging behind the mouse cursor if it is no longer being
  37  *     dragged.
  38  *  o  Fix up libavoid's representation after undo actions.  It doesn't see
  39  *     any transform signals and hence doesn't know shapes have moved back to
  40  *     there earlier positions.
  41  *  o  Decide whether drawing/editing mode should be an Inkscape preference
  42  *     or the connector tool should always start in drawing mode.
  43  *  o  Correct the problem with switching to the select tool when pressing
  44  *     space bar (there are moments when it refuses to do so).
  45  *
  46  * ----------------------------------------------------------------------------
  47  *
  48  * mjwybrow's observations on acracan's Summer of Code connector work:
  49  *
  50  *  -  GUI comments:
  51  *
  52  *      -  Buttons for adding and removing user-specified connection
  53  *      points should probably have "+" and "-" symbols on them so they
  54  *      are consistent with the similar buttons for the node tool.
  55  *      -  Controls on the connector tool be should be reordered logically,
  56  *      possibly as follows:
  57  *
  58  *      *Connector*: [Polyline-radio-button] [Orthgonal-radio-button]
  59  *        [Curvature-control] | *Shape*: [Avoid-button] [Dont-avoid-button]
  60  *        [Spacing-control] | *Connection pts*: [Edit-mode] [Add-pt] [Rm-pt]
  61  *
  62  *      I think that the network layout controls be moved to the
  63  *      Align and Distribute dialog (there is already the layout button
  64  *      there, but no options are exposed).
  65  *
  66  *      I think that the style change between polyline and orthogonal
  67  *      would be much clearer with two buttons (radio behaviour -- just
  68  *      one is true).
  69  *
  70  *      The other tools show a label change from "New:" to "Change:"
  71  *      depending on whether an object is selected.  We could consider
  72  *      this but there may not be space.
  73  *
  74  *      The Add-pt and Rm-pt buttons should be greyed out (inactive) if
  75  *      we are not in connection point editing mode.  And probably also
  76  *      if there is no shape selected, i.e. at the times they have no
  77  *      effect when clicked.
  78  *
  79  *      Likewise for the avoid/ignore shapes buttons.  These should be
  80  *      inactive when a shape is not selected in the connector context.
  81  *
  82  *  -  When creating/editing connection points:
  83  *
  84  *      -  Strange things can happen if you have connectors selected, or
  85  *      try rerouting connectors by dragging their endpoints when in
  86  *      connection point editing mode.
  87  *
  88  *      -  Possibly the selected shape's connection points should always
  89  *      be shown (i.e., have knots) when in editing mode.
  90  *
  91  *      -  It is a little strange to be able to place connection points
  92  *      competely outside shapes.  Especially when you later can't draw
  93  *      connectors to them since the knots are only visible when you
  94  *      are over the shape.  I think that you should only be able to
  95  *      place connection points inside or on the boundary of the shape
  96  *      itself.
  97  *
  98  *      -  The intended ability to place a new point at the current cursor
  99  *      position by pressing RETURN does not seem to work.
 100  *
 101  *      -  The Status bar tooltip should change to reflect editing mode
 102  *      and tell the user about RETURN and how to use the tool.
 103  *
 104  *  -  Connection points general:
 105  *
 106  *      -  Connection points that were inside the shape can end up outside
 107  *      after a rotation is applied to the shape in the select tool.
 108  *      It doesn't seem like the correct transform is being applied to
 109  *      these, or it is being applied at the wrong time.  I'd expect
 110  *      connection points to rotate with the shape, and stay at the
 111  *      same position "on the shape"
 112  *
 113  *      -  I was able to make the connectors attached to a shape fall off
 114  *      the shape after scaling it.  Not sure the exact cause, but may
 115  *      require more investigation/debugging.
 116  *
 117  *      -  The user-defined connection points should be either absolute
 118  *      (as the current ones are) or defined as a percentage of the
 119  *      shape.  These would be based on a toggle setting on the
 120  *      toolbar, and they would be placed in exactly the same way by
 121  *      the user.  The only difference would be that they would be
 122  *      store as percentage positions in the SVG connection-points
 123  *      property and that they would update/move automatically if the
 124  *      object was resized or scaled.
 125  *
 126  *      -  Thinking more, I think you always want to store and think about
 127  *      the positions of connection points to be pre-transform, but
 128  *      obviously the shape transform is applied to them.  That way,
 129  *      they will rotate and scale automatically with the shape, when
 130  *      the shape transform is altered.  The Percentage version would
 131  *      compute their position from the pre-transform dimensions and
 132  *      then have the transform applied to them, for example.
 133  *
 134  *      -  The connection points in the test_connection_points.svg file
 135  *      seem to follow the shape when it is moved, but connection
 136  *      points I add to new shapes, do not follow the shape, either
 137  *      when the shape is just moved or transformed.  There is
 138  *      something wrong here.  What exactly should the behaviour be
 139  *      currently?
 140  *
 141  *      -  I see that connection points are specified at absolute canvas
 142  *      positions.  I really think that they should be specified in
 143  *      shape coordinated relative to the shapes.  There may be
 144  *      transforms applied to layers and the canvas which would make
 145  *      specifying them quite difficult.  I'd expect a position of 0, 0
 146  *      to be on the shape in question or very close to it, for example.
 147  *
 148  */
 149
 150
 151
 152 #include <gdk/gdkkeysyms.h>
 153 #include <string>
 154 #include <cstring>
 155
 156 #include "connector-context.h"
 157 #include "pixmaps/cursor-connector.xpm"
 158 #include "pixmaps/cursor-node.xpm"
 159 //#include "pixmaps/cursor-node-m.xpm"
 160 //#include "pixmaps/cursor-node-d.xpm"
 161 #include "xml/node-event-vector.h"
 162 #include "xml/repr.h"
 163 #include "svg/svg.h"
 164 #include "desktop.h"
 165 #include "desktop-style.h"
 166 #include "desktop-handles.h"
 167 #include "document.h"
 168 #include "message-context.h"
 169 #include "message-stack.h"
 170 #include "selection.h"
 171 #include "inkscape.h"
 172 #include "preferences.h"
 173 #include "sp-path.h"
 174 #include "display/canvas-bpath.h"
 175 #include "display/sodipodi-ctrl.h"
 176 #include <glibmm/i18n.h>
 177 #include <glibmm/stringutils.h>
 178 #include "snap.h"
 179 #include "knot.h"
 180 #include "sp-conn-end.h"
 181 #include "sp-conn-end-pair.h"
 182 #include "conn-avoid-ref.h"
 183 #include "libavoid/vertices.h"
 184 #include "libavoid/router.h"
 185 #include "context-fns.h"
 186 #include "sp-namedview.h"
 187 #include "sp-text.h"
 188 #include "sp-flowtext.h"
 189 #include "display/curve.h"
 190
 191 static void sp_connector_context_class_init(SPConnectorContextClass *klass);
 192 static void sp_connector_context_init(SPConnectorContext *conn_context);
 193 static void sp_connector_context_dispose(GObject *object);
 194
 195 static void sp_connector_context_setup(SPEventContext *ec);
 196 static void sp_connector_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val);
 197 static void sp_connector_context_finish(SPEventContext *ec);
 198 static gint sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event);
 199 static gint sp_connector_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
 200
 201 // Stuff borrowed from DrawContext
 202 static void spcc_connector_set_initial_point(SPConnectorContext *cc, Geom::Point const p);
 203 static void spcc_connector_set_subsequent_point(SPConnectorContext *cc, Geom::Point const p);
 204 static void spcc_connector_finish_segment(SPConnectorContext *cc, Geom::Point p);
 205 static void spcc_reset_colors(SPConnectorContext *cc);
 206 static void spcc_connector_finish(SPConnectorContext *cc);
 207 static void spcc_concat_colors_and_flush(SPConnectorContext *cc);
 208 static void spcc_flush_white(SPConnectorContext *cc, SPCurve *gc);
 209
 210 // Context event handlers
 211 static gint connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent);
 212 static gint connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent);
 213 static gint connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent);
 214 static gint connector_handle_key_press(SPConnectorContext *const cc, guint const keyval);
 215
 216 static void cc_active_shape_add_knot(SPDesktop* desktop, SPItem* item, ConnectionPointMap &cphandles, ConnectionPoint& cp);
 217 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item);
 218 static void cc_clear_active_shape(SPConnectorContext *cc);
 219 static void cc_set_active_conn(SPConnectorContext *cc, SPItem *item);
 220 static void cc_clear_active_conn(SPConnectorContext *cc);
 221 static gchar *conn_pt_handle_test(SPConnectorContext *cc, Geom::Point& w);
 222 static void cc_select_handle(SPKnot* knot);
 223 static void cc_deselect_handle(SPKnot* knot);
 224 static bool cc_item_is_shape(SPItem *item);
 225 static void cc_selection_changed(Inkscape::Selection *selection, gpointer data);
 226 static void cc_connector_rerouting_finish(SPConnectorContext *const cc,
 227         Geom::Point *const p);
 228
 229 static void shape_event_attr_deleted(Inkscape::XML::Node *repr,
 230         Inkscape::XML::Node *child, Inkscape::XML::Node *ref, gpointer data);
 231 static void shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
 232         gchar const *old_value, gchar const *new_value, bool is_interactive,
 233         gpointer data);
 234
 235
 236 /*static Geom::Point connector_drag_origin_w(0, 0);
 237 static bool connector_within_tolerance = false;*/
 238 static SPEventContextClass *parent_class;
 239
 240
 241 static Inkscape::XML::NodeEventVector shape_repr_events = {
 242     NULL, /* child_added */
 243     NULL, /* child_added */
 244     shape_event_attr_changed,
 245     NULL, /* content_changed */
 246     NULL  /* order_changed */
 247 };
 248
 249 static Inkscape::XML::NodeEventVector layer_repr_events = {
 250     NULL, /* child_added */
 251     shape_event_attr_deleted,
 252     NULL, /* child_added */
 253     NULL, /* content_changed */
 254     NULL  /* order_changed */
 255 };
 256
 257
 258 GType
 259 sp_connector_context_get_type(void)
 260 {
 261     static GType type = 0;
 262     if (!type) {
 263         GTypeInfo info = {
 264             sizeof(SPConnectorContextClass),
 265             NULL, NULL,
 266             (GClassInitFunc) sp_connector_context_class_init,
 267             NULL, NULL,
 268             sizeof(SPConnectorContext),
 269             4,
 270             (GInstanceInitFunc) sp_connector_context_init,
 271             NULL,   /* value_table */
 272         };
 273         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPConnectorContext", &info, (GTypeFlags)0);
 274     }
 275     return type;
 276 }
 277
 278 static void
 279 sp_connector_context_class_init(SPConnectorContextClass *klass)
 280 {
 281     GObjectClass *object_class;
 282     SPEventContextClass *event_context_class;
 283
 284     object_class = (GObjectClass *) klass;
 285     event_context_class = (SPEventContextClass *) klass;
 286
 287     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 288
 289     object_class->dispose = sp_connector_context_dispose;
 290
 291     event_context_class->setup = sp_connector_context_setup;
 292     event_context_class->set = sp_connector_context_set;
 293     event_context_class->finish = sp_connector_context_finish;
 294     event_context_class->root_handler = sp_connector_context_root_handler;
 295     event_context_class->item_handler = sp_connector_context_item_handler;
 296 }
 297
 298
 299 static void
 300 sp_connector_context_init(SPConnectorContext *cc)
 301 {
 302     SPEventContext *ec = SP_EVENT_CONTEXT(cc);
 303
 304     ec->cursor_shape = cursor_connector_xpm;
 305     ec->hot_x = 1;
 306     ec->hot_y = 1;
 307     ec->xp = 0;
 308     ec->yp = 0;
 309
 310     cc->mode = SP_CONNECTOR_CONTEXT_DRAWING_MODE;
 311     cc->knot_tip = 0;
 312
 313     cc->red_color = 0xff00007f;
 314
 315     cc->newconn = NULL;
 316     cc->newConnRef = NULL;
 317     cc->curvature = 0.0;
 318
 319     cc->sel_changed_connection = sigc::connection();
 320
 321     cc->active_shape = NULL;
 322     cc->active_shape_repr = NULL;
 323     cc->active_shape_layer_repr = NULL;
 324
 325     cc->active_conn = NULL;
 326     cc->active_conn_repr = NULL;
 327
 328     cc->active_handle = NULL;
 329
 330     cc->selected_handle = NULL;
 331
 332     cc->clickeditem = NULL;
 333     cc->clickedhandle = NULL;
 334
 335     new (&cc->connpthandles) ConnectionPointMap();
 336
 337     for (int i = 0; i < 2; ++i) {
 338         cc->endpt_handle[i] = NULL;
 339         cc->endpt_handler_id[i] = 0;
 340     }
 341     cc->sid = NULL;
 342     cc->eid = NULL;
 343     cc->npoints = 0;
 344     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 345 }
 346
 347
 348 static void
 349 sp_connector_context_dispose(GObject *object)
 350 {
 351     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(object);
 352
 353     cc->sel_changed_connection.disconnect();
 354
 355     if (!cc->connpthandles.empty()) {
 356         for (ConnectionPointMap::iterator it = cc->connpthandles.begin();
 357                 it != cc->connpthandles.end(); ++it) {
 358             g_object_unref(it->first);
 359         }
 360         cc->connpthandles.clear();
 361     }
 362     cc->connpthandles.~ConnectionPointMap();
 363     for (int i = 0; i < 2; ++i) {
 364         if (cc->endpt_handle[1]) {
 365             g_object_unref(cc->endpt_handle[i]);
 366             cc->endpt_handle[i] = NULL;
 367         }
 368     }
 369     if (cc->sid) {
 370         g_free(cc->sid);
 371         cc->sid = NULL;
 372     }
 373     if (cc->eid) {
 374         g_free(cc->eid);
 375         cc->eid = NULL;
 376     }
 377     g_assert( cc->newConnRef == NULL );
 378
 379     G_OBJECT_CLASS(parent_class)->dispose(object);
 380 }
 381
 382
 383 static void
 384 sp_connector_context_setup(SPEventContext *ec)
 385 {
 386     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 387     SPDesktop *dt = ec->desktop;
 388
 389     if (((SPEventContextClass *) parent_class)->setup) {
 390         ((SPEventContextClass *) parent_class)->setup(ec);
 391     }
 392
 393     cc->selection = sp_desktop_selection(dt);
 394
 395     cc->sel_changed_connection.disconnect();
 396     cc->sel_changed_connection = cc->selection->connectChanged(
 397             sigc::bind(sigc::ptr_fun(&cc_selection_changed),
 398             (gpointer) cc));
 399
 400     /* Create red bpath */
 401     cc->red_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 402     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cc->red_bpath), cc->red_color,
 403             1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 404     sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cc->red_bpath), 0x00000000,
 405             SP_WIND_RULE_NONZERO);
 406     /* Create red curve */
 407     cc->red_curve = new SPCurve();
 408
 409     /* Create green curve */
 410     cc->green_curve = new SPCurve();
 411
 412     // Notice the initial selection.
 413     cc_selection_changed(cc->selection, (gpointer) cc);
 414
 415     cc->within_tolerance = false;
 416
 417     sp_event_context_read(ec, "curvature");
 418     sp_event_context_read(ec, "orthogonal");
 419     sp_event_context_read(ec, "mode");
 420     cc->knot_tip = cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE ? cc_knot_tips[0] : cc_knot_tips[1];
 421     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 422     if (prefs->getBool("/tools/connector/selcue", 0)) {
 423         ec->enableSelectionCue();
 424     }
 425
 426     // Make sure we see all enter events for canvas items,
 427     // even if a mouse button is depressed.
 428     dt->canvas->gen_all_enter_events = true;
 429 }
 430
 431
 432 static void
 433 sp_connector_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val)
 434 {
 435     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 436
 437     /* fixme: Proper error handling for non-numeric data.  Use a locale-independent function like
 438      * g_ascii_strtod (or a thin wrapper that does the right thing for invalid values inf/nan). */
 439     Glib::ustring name = val->getEntryName();
 440     if ( name == "curvature" ) {
 441         cc->curvature = val->getDoubleLimited(); // prevents NaN and +/-Inf from messing up
 442     }
 443     else if ( name == "orthogonal" ) {
 444         cc->isOrthogonal = val->getBool();
 445     }
 446     else if ( name == "mode")
 447     {
 448         sp_connector_context_switch_mode(ec, val->getBool() ? SP_CONNECTOR_CONTEXT_EDITING_MODE : SP_CONNECTOR_CONTEXT_DRAWING_MODE);
 449     }
 450 }
 451
 452 void sp_connector_context_switch_mode(SPEventContext* ec, unsigned int newMode)
 453 {
 454     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 455
 456     cc->mode = newMode;
 457     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
 458     {
 459         ec->cursor_shape = cursor_connector_xpm;
 460         cc->knot_tip = cc_knot_tips[0];
 461         if (cc->selected_handle)
 462             cc_deselect_handle( cc->selected_handle );
 463         cc->selected_handle = NULL;
 464         // Show all default connection points
 465
 466     }
 467     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
 468     {
 469         ec->cursor_shape = cursor_node_xpm;
 470         cc->knot_tip = cc_knot_tips[1];
 471 /*            if (cc->active_shape)
 472         {
 473             cc->selection->set( SP_OBJECT( cc->active_shape ) );
 474         }
 475         else
 476         {
 477             SPItem* item = cc->selection->singleItem();
 478             if ( item )
 479             {
 480                 cc_set_active_shape(cc, item);
 481                 cc->selection->set( SP_OBJECT( item ) );
 482             }
 483         }*/
 484     }
 485     sp_event_context_update_cursor(ec);
 486
 487 }
 488
 489
 490 static void
 491 sp_connector_context_finish(SPEventContext *ec)
 492 {
 493     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 494
 495     spcc_connector_finish(cc);
 496     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 497
 498     if (((SPEventContextClass *) parent_class)->finish) {
 499         ((SPEventContextClass *) parent_class)->finish(ec);
 500     }
 501
 502     if (cc->selection) {
 503         cc->selection = NULL;
 504     }
 505     cc_clear_active_shape(cc);
 506     cc_clear_active_conn(cc);
 507
 508     // Restore the default event generating behaviour.
 509     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(ec);
 510     desktop->canvas->gen_all_enter_events = false;
 511 }
 512
 513
 514 //-----------------------------------------------------------------------------
 515
 516
 517 static void
 518 cc_clear_active_shape(SPConnectorContext *cc)
 519 {
 520     if (cc->active_shape == NULL) {
 521         return;
 522     }
 523     g_assert( cc->active_shape_repr );
 524     g_assert( cc->active_shape_layer_repr );
 525
 526     cc->active_shape = NULL;
 527
 528     if (cc->active_shape_repr) {
 529         sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
 530         Inkscape::GC::release(cc->active_shape_repr);
 531         cc->active_shape_repr = NULL;
 532
 533         sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
 534         Inkscape::GC::release(cc->active_shape_layer_repr);
 535         cc->active_shape_layer_repr = NULL;
 536     }
 537
 538     // Hide the connection points if they exist.
 539     if (cc->connpthandles.size()) {
 540         for (ConnectionPointMap::iterator it = cc->connpthandles.begin();
 541                 it != cc->connpthandles.end(); ++it) {
 542             sp_knot_hide(it->first);
 543         }
 544     }
 545 }
 546
 547
 548 static void
 549 cc_clear_active_conn(SPConnectorContext *cc)
 550 {
 551     if (cc->active_conn == NULL) {
 552         return;
 553     }
 554     g_assert( cc->active_conn_repr );
 555
 556     cc->active_conn = NULL;
 557
 558     if (cc->active_conn_repr) {
 559         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
 560         Inkscape::GC::release(cc->active_conn_repr);
 561         cc->active_conn_repr = NULL;
 562     }
 563
 564     // Hide the endpoint handles.
 565     for (int i = 0; i < 2; ++i) {
 566         if (cc->endpt_handle[i]) {
 567             sp_knot_hide(cc->endpt_handle[i]);
 568         }
 569     }
 570 }
 571
 572
 573 static gchar *
 574 conn_pt_handle_test(SPConnectorContext *cc, Geom::Point& p)
 575 {
 576     // TODO: this will need to change when there are more connection
 577     //       points available for each shape.
 578
 579     if (cc->active_handle && (cc->connpthandles.find(cc->active_handle) != cc->connpthandles.end()))
 580     {
 581         p = cc->active_handle->pos;
 582         const ConnectionPoint& cp = cc->connpthandles[cc->active_handle];
 583         return g_strdup_printf("#%s_%c_%d", SP_OBJECT_ID(cc->active_shape),
 584                                cp.type == ConnPointDefault ? 'd' : 'u' , cp.id);
 585     }
 586     return NULL;
 587 }
 588
 589 static void
 590 cc_select_handle(SPKnot* knot)
 591 {
 592     knot->setShape(SP_KNOT_SHAPE_SQUARE);
 593     knot->setSize(10);
 594     knot->setAnchor(GTK_ANCHOR_CENTER);
 595     knot->setFill(0x0000ffff, 0x0000ffff, 0x0000ffff);
 596     sp_knot_update_ctrl(knot);
 597 }
 598
 599 static void
 600 cc_deselect_handle(SPKnot* knot)
 601 {
 602     knot->setShape(SP_KNOT_SHAPE_SQUARE);
 603     knot->setSize(8);
 604     knot->setAnchor(GTK_ANCHOR_CENTER);
 605     knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
 606     sp_knot_update_ctrl(knot);
 607 }
 608
 609 static gint
 610 sp_connector_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 611 {
 612     gint ret = FALSE;
 613
 614     SPDesktop *desktop = event_context->desktop;
 615
 616     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(event_context);
 617
 618     Geom::Point p(event->button.x, event->button.y);
 619
 620     switch (event->type) {
 621         case GDK_BUTTON_RELEASE:
 622             if (event->button.button == 1 && !event_context->space_panning) {
 623                 if ((cc->state == SP_CONNECTOR_CONTEXT_DRAGGING) &&
 624                         (event_context->within_tolerance))
 625                 {
 626                     spcc_reset_colors(cc);
 627                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 628                 }
 629                 if (cc->state != SP_CONNECTOR_CONTEXT_IDLE) {
 630                     // Doing something else like rerouting.
 631                     break;
 632                 }
 633                 // find out clicked item, honoring Alt
 634                 SPItem *item = sp_event_context_find_item(desktop,
 635                         p, event->button.state & GDK_MOD1_MASK, FALSE);
 636
 637                 if (event->button.state & GDK_SHIFT_MASK) {
 638                     cc->selection->toggle(item);
 639                 } else {
 640                     cc->selection->set(item);
 641                     if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE && cc->selected_handle )
 642                     {
 643                         cc_deselect_handle( cc->selected_handle );
 644                         cc->selected_handle = NULL;
 645                     }
 646                     /* When selecting a new item,
 647                        do not allow showing connection points
 648                        on connectors. (yet?)
 649                     */
 650                     if ( item != cc->active_shape && !cc_item_is_connector( item ) )
 651                         cc_set_active_shape( cc, item );
 652                 }
 653                 ret = TRUE;
 654
 655             }
 656             break;
 657         case GDK_ENTER_NOTIFY:
 658         {
 659             if (cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE || (cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE && !cc->selected_handle))
 660             {
 661                 if (cc_item_is_shape(item)) {
 662
 663                     // I don't really understand what the above does,
 664                     // so I commented it.
 665                     // This is a shape, so show connection point(s).
 666     /*                if (!(cc->active_shape)
 667                             // Don't show handle for another handle.
 668     //                         || (cc->connpthandles.find((SPKnot*) item) != cc->connpthandles.end())
 669                         )
 670                     {
 671                         cc_set_active_shape(cc, item);
 672                     }*/
 673                     cc_set_active_shape(cc, item);
 674                 }
 675                 ret = TRUE;
 676             }
 677             break;
 678         }
 679         default:
 680             break;
 681     }
 682
 683     return ret;
 684 }
 685
 686
 687 gint
 688 sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event)
 689 {
 690     SPConnectorContext *const cc = SP_CONNECTOR_CONTEXT(ec);
 691
 692     gint ret = FALSE;
 693
 694     switch (event->type) {
 695         case GDK_BUTTON_PRESS:
 696             ret = connector_handle_button_press(cc, event->button);
 697             break;
 698
 699         case GDK_MOTION_NOTIFY:
 700             ret = connector_handle_motion_notify(cc, event->motion);
 701             break;
 702
 703         case GDK_BUTTON_RELEASE:
 704             ret = connector_handle_button_release(cc, event->button);
 705             break;
 706         case GDK_KEY_PRESS:
 707             ret = connector_handle_key_press(cc, get_group0_keyval (&event->key));
 708             break;
 709
 710         default:
 711             break;
 712     }
 713
 714     if (!ret) {
 715         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 716             = ((SPEventContextClass *) parent_class)->root_handler;
 717         if (parent_root_handler) {
 718             ret = parent_root_handler(ec, event);
 719         }
 720     }
 721
 722     return ret;
 723 }
 724
 725
 726 static gint
 727 connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent)
 728 {
 729     Geom::Point const event_w(bevent.x, bevent.y);
 730     /* Find desktop coordinates */
 731     Geom::Point p = cc->desktop->w2d(event_w);
 732     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 733
 734     gint ret = FALSE;
 735     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
 736     {
 737         if ( bevent.button == 1 && !event_context->space_panning ) {
 738
 739             SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 740
 741             if (Inkscape::have_viable_layer(desktop, cc->_message_context) == false) {
 742                 return TRUE;
 743             }
 744
 745             Geom::Point const event_w(bevent.x,
 746                                     bevent.y);
 747 //             connector_drag_origin_w = event_w;
 748             cc->xp = bevent.x;
 749             cc->yp = bevent.y;
 750             cc->within_tolerance = true;
 751
 752             Geom::Point const event_dt = cc->desktop->w2d(event_w);
 753
 754             SnapManager &m = cc->desktop->namedview->snap_manager;
 755             m.setup(cc->desktop);
 756
 757             switch (cc->state) {
 758                 case SP_CONNECTOR_CONTEXT_STOP:
 759                     /* This is allowed, if we just canceled curve */
 760                 case SP_CONNECTOR_CONTEXT_IDLE:
 761                 {
 762                     if ( cc->npoints == 0 ) {
 763                         cc_clear_active_conn(cc);
 764
 765                         SP_EVENT_CONTEXT_DESKTOP(cc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new connector"));
 766
 767                         /* Set start anchor */
 768                         /* Create green anchor */
 769                         Geom::Point p = event_dt;
 770
 771                         // Test whether we clicked on a connection point
 772                         cc->sid = conn_pt_handle_test(cc, p);
 773
 774                         if (!cc->sid) {
 775                             // This is the first point, so just snap it to the grid
 776                             // as there's no other points to go off.
 777                             m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 778                         }
 779                         spcc_connector_set_initial_point(cc, p);
 780
 781                     }
 782                     cc->state = SP_CONNECTOR_CONTEXT_DRAGGING;
 783                     ret = TRUE;
 784                     break;
 785                 }
 786                 case SP_CONNECTOR_CONTEXT_DRAGGING:
 787                 {
 788                     // This is the second click of a connector creation.
 789                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 790
 791                     spcc_connector_set_subsequent_point(cc, p);
 792                     spcc_connector_finish_segment(cc, p);
 793                     // Test whether we clicked on a connection point
 794                     cc->eid = conn_pt_handle_test(cc, p);
 795                     if (cc->npoints != 0) {
 796                         spcc_connector_finish(cc);
 797                     }
 798                     cc_set_active_conn(cc, cc->newconn);
 799                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 800                     ret = TRUE;
 801                     break;
 802                 }
 803                 case SP_CONNECTOR_CONTEXT_CLOSE:
 804                 {
 805                     g_warning("Button down in CLOSE state");
 806                     break;
 807                 }
 808                 default:
 809                     break;
 810             }
 811         } else if (bevent.button == 3) {
 812             if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
 813                 // A context menu is going to be triggered here,
 814                 // so end the rerouting operation.
 815                 cc_connector_rerouting_finish(cc, &p);
 816
 817                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 818
 819                 // Don't set ret to TRUE, so we drop through to the
 820                 // parent handler which will open the context menu.
 821             }
 822             else if (cc->npoints != 0) {
 823                 spcc_connector_finish(cc);
 824                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 825                 ret = TRUE;
 826             }
 827         }
 828     }
 829     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
 830     {
 831         if ( bevent.button == 1 && !event_context->space_panning )
 832         {
 833             // Initialize variables in case of dragging
 834
 835             SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 836
 837             if (Inkscape::have_viable_layer(desktop, cc->_message_context) == false) {
 838                 return TRUE;
 839             }
 840
 841             cc->xp = bevent.x;
 842             cc->yp = bevent.y;
 843             cc->within_tolerance = true;
 844
 845             ConnectionPointMap::iterator const& active_knot_it = cc->connpthandles.find( cc->active_handle );
 846
 847             switch (cc->state)
 848             {
 849                 case SP_CONNECTOR_CONTEXT_IDLE:
 850                     if ( active_knot_it != cc->connpthandles.end() )
 851                     {
 852                         // We do not allow selecting and, thereby, moving default knots
 853                         if ( active_knot_it->second.type != ConnPointDefault)
 854                         {
 855                             if (cc->selected_handle != cc->active_handle)
 856                             {
 857                                 if ( cc->selected_handle )
 858                                     cc_deselect_handle( cc->selected_handle );
 859                                 cc->selected_handle = cc->active_handle;
 860                                 cc_select_handle( cc->selected_handle );
 861                             }
 862                         }
 863                         else
 864                             // Just ignore the default connection point
 865                             return FALSE;
 866                     }
 867                     else
 868                         if ( cc->selected_handle )
 869                         {
 870                             cc_deselect_handle( cc->selected_handle );
 871                             cc->selected_handle = NULL;
 872                         }
 873
 874                     if ( cc->selected_handle )
 875                     {
 876                         cc->state = SP_CONNECTOR_CONTEXT_DRAGGING;
 877                         cc->selection->set( SP_OBJECT( cc->active_shape ) );
 878                     }
 879
 880                     ret = TRUE;
 881                     break;
 882                 // Dragging valid because of the way we create
 883                 // new connection points.
 884                 case SP_CONNECTOR_CONTEXT_DRAGGING:
 885                     // Do nothing.
 886                     ret = TRUE;
 887                     break;
 888             }
 889         }
 890     }
 891     return ret;
 892 }
 893
 894
 895 static gint
 896 connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent)
 897 {
 898     gint ret = FALSE;
 899     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 900     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 901
 902     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 903         // allow middle-button scrolling
 904         return FALSE;
 905     }
 906
 907     Geom::Point const event_w(mevent.x, mevent.y);
 908
 909     if (cc->within_tolerance) {
 910         cc->tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 911         if ( ( abs( (gint) mevent.x - cc->xp ) < cc->tolerance ) &&
 912              ( abs( (gint) mevent.y - cc->yp ) < cc->tolerance ) ) {
 913             return FALSE;   // Do not drag if we're within tolerance from origin.
 914         }
 915     }
 916     // Once the user has moved farther than tolerance from the original location
 917     // (indicating they intend to move the object, not click), then always process
 918     // the motion notify coordinates as given (no snapping back to origin)
 919     cc->within_tolerance = false;
 920
 921     SPDesktop *const dt = cc->desktop;
 922
 923     /* Find desktop coordinates */
 924     Geom::Point p = dt->w2d(event_w);
 925
 926     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
 927     {
 928         SnapManager &m = dt->namedview->snap_manager;
 929         m.setup(dt);
 930
 931         switch (cc->state) {
 932             case SP_CONNECTOR_CONTEXT_DRAGGING:
 933             {
 934                 gobble_motion_events(mevent.state);
 935                 // This is movement during a connector creation.
 936                 if ( cc->npoints > 0 ) {
 937                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 938                     cc->selection->clear();
 939                     spcc_connector_set_subsequent_point(cc, p);
 940                     ret = TRUE;
 941                 }
 942                 break;
 943             }
 944             case SP_CONNECTOR_CONTEXT_REROUTING:
 945             {
 946                 gobble_motion_events(GDK_BUTTON1_MASK);
 947                 g_assert( SP_IS_PATH(cc->clickeditem));
 948
 949                 m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 950
 951                 // Update the hidden path
 952                 Geom::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
 953                 Geom::Matrix d2i = i2d.inverse();
 954                 SPPath *path = SP_PATH(cc->clickeditem);
 955                 SPCurve *curve = path->original_curve ? path->original_curve : path->curve;
 956                 if (cc->clickedhandle == cc->endpt_handle[0]) {
 957                     Geom::Point o = cc->endpt_handle[1]->pos;
 958                     curve->stretch_endpoints(p * d2i, o * d2i);
 959                 }
 960                 else {
 961                     Geom::Point o = cc->endpt_handle[0]->pos;
 962                     curve->stretch_endpoints(o * d2i, p * d2i);
 963                 }
 964                 sp_conn_reroute_path_immediate(path);
 965
 966                 // Copy this to the temporary visible path
 967                 cc->red_curve = path->original_curve ?
 968                         path->original_curve->copy() : path->curve->copy();
 969                 cc->red_curve->transform(i2d);
 970
 971                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 972                 ret = TRUE;
 973                 break;
 974             }
 975             case SP_CONNECTOR_CONTEXT_STOP:
 976                 /* This is perfectly valid */
 977                 break;
 978             default:
 979                 if (!sp_event_context_knot_mouseover(cc)) {
 980                     m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_OTHER_HANDLE));
 981                 }
 982                 break;
 983         }
 984     }
 985     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
 986     {
 987         switch ( cc->state )
 988         {
 989             case SP_CONNECTOR_CONTEXT_DRAGGING:
 990                 sp_knot_set_position(cc->selected_handle, p, 0);
 991                 ret = TRUE;
 992                 break;
 993             case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
 994                 sp_knot_set_position(cc->selected_handle, p, 0);
 995                 ret = TRUE;
 996                 break;
 997         }
 998     }
 999
1000     return ret;
1001 }
1002
1003
1004 static gint
1005 connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent)
1006 {
1007     gint ret = FALSE;
1008     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
1009     if ( revent.button == 1 && !event_context->space_panning ) {
1010
1011         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1012         SPDocument *doc = sp_desktop_document(desktop);
1013
1014         SnapManager &m = desktop->namedview->snap_manager;
1015         m.setup(desktop);
1016
1017         Geom::Point const event_w(revent.x, revent.y);
1018
1019         /* Find desktop coordinates */
1020         Geom::Point p = cc->desktop->w2d(event_w);
1021         if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
1022         {
1023             switch (cc->state) {
1024                 //case SP_CONNECTOR_CONTEXT_POINT:
1025                 case SP_CONNECTOR_CONTEXT_DRAGGING:
1026                 {
1027                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1028
1029                     if (cc->within_tolerance)
1030                     {
1031                         spcc_connector_finish_segment(cc, p);
1032                         return TRUE;
1033                     }
1034                     // Connector has been created via a drag, end it now.
1035                     spcc_connector_set_subsequent_point(cc, p);
1036                     spcc_connector_finish_segment(cc, p);
1037                     // Test whether we clicked on a connection point
1038                     cc->eid = conn_pt_handle_test(cc, p);
1039                     if (cc->npoints != 0) {
1040                         spcc_connector_finish(cc);
1041                     }
1042                     cc_set_active_conn(cc, cc->newconn);
1043                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1044                     break;
1045                 }
1046                 case SP_CONNECTOR_CONTEXT_REROUTING:
1047                 {
1048                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1049                     cc_connector_rerouting_finish(cc, &p);
1050
1051                     sp_document_ensure_up_to_date(doc);
1052                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1053                     return TRUE;
1054                     break;
1055                 }
1056                 case SP_CONNECTOR_CONTEXT_STOP:
1057                     /* This is allowed, if we just cancelled curve */
1058                     break;
1059                 default:
1060                     break;
1061             }
1062             ret = TRUE;
1063         }
1064         else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
1065         {
1066             switch ( cc->state )
1067             {
1068                 case SP_CONNECTOR_CONTEXT_DRAGGING:
1069
1070                     if (!cc->within_tolerance)
1071                     {
1072                         m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1073                         sp_knot_set_position(cc->selected_handle, p, 0);
1074                         ConnectionPoint& cp = cc->connpthandles[cc->selected_handle];
1075                         cp.pos = p * sp_item_dt2i_affine(cc->active_shape);
1076                         cc->active_shape->avoidRef->updateConnectionPoint(cp);
1077                     }
1078
1079                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1080                     ret = TRUE;
1081                     break;
1082
1083
1084                 case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
1085                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1086
1087                     sp_knot_set_position(cc->selected_handle, p, 0);
1088
1089                     ConnectionPoint cp;
1090                     cp.type = ConnPointUserDefined;
1091                     cp.pos = p * sp_item_dt2i_affine(cc->active_shape);
1092                     cp.dir = Avoid::ConnDirAll;
1093                     g_object_unref(cc->selected_handle);
1094                     cc->active_shape->avoidRef->addConnectionPoint(cp);
1095                     sp_document_ensure_up_to_date(doc);
1096                     for (ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end(); ++it)
1097                         if (it->second.type == ConnPointUserDefined && it->second.id == cp.id)
1098                         {
1099                             cc->selected_handle = it->first;
1100                             break;
1101                         }
1102                     cc_select_handle( cc->selected_handle );
1103                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1104                     ret = TRUE;
1105                     break;
1106             }
1107         }
1108     }
1109
1110
1111     return ret;
1112 }
1113
1114
1115 static gint
1116 connector_handle_key_press(SPConnectorContext *const cc, guint const keyval)
1117 {
1118     gint ret = FALSE;
1119     /* fixme: */
1120     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
1121     {
1122         switch (keyval) {
1123             case GDK_Return:
1124             case GDK_KP_Enter:
1125                 if (cc->npoints != 0) {
1126                     spcc_connector_finish(cc);
1127                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1128                     ret = TRUE;
1129                 }
1130                 break;
1131             case GDK_Escape:
1132                 if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
1133
1134                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1135                     SPDocument *doc = sp_desktop_document(desktop);
1136
1137                     cc_connector_rerouting_finish(cc, NULL);
1138
1139                     sp_document_undo(doc);
1140
1141                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1142                     desktop->messageStack()->flash( Inkscape::NORMAL_MESSAGE,
1143                             _("Connector endpoint drag cancelled."));
1144                     ret = TRUE;
1145                 }
1146                 else if (cc->npoints != 0) {
1147                     // if drawing, cancel, otherwise pass it up for deselecting
1148                     cc->state = SP_CONNECTOR_CONTEXT_STOP;
1149                     spcc_reset_colors(cc);
1150                     ret = TRUE;
1151                 }
1152                 break;
1153             default:
1154                 break;
1155         }
1156     }
1157     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
1158     {
1159         switch ( cc->state )
1160         {
1161             case SP_CONNECTOR_CONTEXT_DRAGGING:
1162                 if ( keyval == GDK_Escape )
1163                 {
1164                     // Cancel connection point dragging
1165
1166                     // Obtain original position
1167                     ConnectionPoint const& cp = cc->connpthandles[cc->selected_handle];
1168                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1169                     const Geom::Matrix& i2doc = sp_item_i2doc_affine(cc->active_shape);
1170                     sp_knot_set_position(cc->selected_handle, cp.pos * i2doc * desktop->doc2dt(), 0);
1171                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1172                     desktop->messageStack()->flash( Inkscape::NORMAL_MESSAGE,
1173                         _("Connection point drag cancelled."));
1174                     ret = TRUE;
1175                 }
1176                 else if ( keyval == GDK_Return || keyval == GDK_KP_Enter )
1177                 {
1178                     // Put connection point at current position
1179
1180                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1181                     SnapManager &m = desktop->namedview->snap_manager;
1182                     m.setup(desktop);
1183                     Geom::Point p = cc->selected_handle->pos;
1184 //                     SPEventContext* event_context = SP_EVENT_CONTEXT( cc );
1185
1186                     if (!cc->within_tolerance)
1187                     {
1188                         m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1189                         sp_knot_set_position(cc->selected_handle, p, 0);
1190                         ConnectionPoint& cp = cc->connpthandles[cc->selected_handle];
1191                         cp.pos = p * sp_item_dt2i_affine(cc->active_shape);
1192                         cc->active_shape->avoidRef->updateConnectionPoint(cp);
1193                     }
1194
1195                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1196                     ret = TRUE;
1197                 }
1198                 break;
1199             case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
1200                 if ( keyval == GDK_Escape )
1201                 {
1202                     // Just destroy the knot
1203                     g_object_unref( cc->selected_handle );
1204                     cc->selected_handle = NULL;
1205                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1206                     ret = TRUE;
1207                 }
1208                 else if ( keyval == GDK_Return || keyval == GDK_KP_Enter )
1209                 {
1210                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1211                     SPDocument *doc = sp_desktop_document(desktop);
1212                     SnapManager &m = desktop->namedview->snap_manager;
1213                     m.setup(desktop);
1214                     Geom::Point p = cc->selected_handle->pos;
1215
1216                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1217
1218                     sp_knot_set_position(cc->selected_handle, p, 0);
1219
1220                     ConnectionPoint cp;
1221                     cp.type = ConnPointUserDefined;
1222                     cp.pos = p * sp_item_dt2i_affine(cc->active_shape);
1223                     cp.dir = Avoid::ConnDirAll;
1224                     g_object_unref(cc->selected_handle);
1225                     cc->active_shape->avoidRef->addConnectionPoint(cp);
1226                     sp_document_ensure_up_to_date(doc);
1227                     for (ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end(); ++it)
1228                         if (it->second.type == ConnPointUserDefined && it->second.id == cp.id)
1229                         {
1230                             cc->selected_handle = it->first;
1231                             break;
1232                         }
1233                     cc_select_handle( cc->selected_handle );
1234                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1235                     ret = TRUE;
1236                 }
1237
1238                 break;
1239             case SP_CONNECTOR_CONTEXT_IDLE:
1240                 if ( keyval == GDK_Delete && cc->selected_handle )
1241                 {
1242                     cc->active_shape->avoidRef->deleteConnectionPoint(cc->connpthandles[cc->selected_handle]);
1243                     cc->selected_handle = NULL;
1244                     ret = TRUE;
1245                 }
1246
1247                 break;
1248         }
1249     }
1250
1251     return ret;
1252 }
1253
1254
1255 static void
1256 cc_connector_rerouting_finish(SPConnectorContext *const cc, Geom::Point *const p)
1257 {
1258     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1259     SPDocument *doc = sp_desktop_document(desktop);
1260
1261     // Clear the temporary path:
1262     cc->red_curve->reset();
1263     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1264
1265     if (p != NULL)
1266     {
1267         // Test whether we clicked on a connection point
1268         gchar *shape_label = conn_pt_handle_test(cc, *p);
1269
1270         if (shape_label) {
1271             if (cc->clickedhandle == cc->endpt_handle[0]) {
1272                 sp_object_setAttribute(cc->clickeditem,
1273                         "inkscape:connection-start",shape_label, false);
1274             }
1275             else {
1276                 sp_object_setAttribute(cc->clickeditem,
1277                         "inkscape:connection-end",shape_label, false);
1278             }
1279             g_free(shape_label);
1280         }
1281     }
1282     cc->clickeditem->setHidden(false);
1283     sp_conn_reroute_path_immediate(SP_PATH(cc->clickeditem));
1284     cc->clickeditem->updateRepr();
1285     sp_document_done(doc, SP_VERB_CONTEXT_CONNECTOR,
1286                      _("Reroute connector"));
1287     cc_set_active_conn(cc, cc->clickeditem);
1288 }
1289
1290
1291 static void
1292 spcc_reset_colors(SPConnectorContext *cc)
1293 {
1294     /* Red */
1295     cc->red_curve->reset();
1296     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1297
1298     cc->green_curve->reset();
1299     cc->npoints = 0;
1300 }
1301
1302
1303 static void
1304 spcc_connector_set_initial_point(SPConnectorContext *const cc, Geom::Point const p)
1305 {
1306     g_assert( cc->npoints == 0 );
1307
1308     cc->p[0] = p;
1309     cc->p[1] = p;
1310     cc->npoints = 2;
1311     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1312 }
1313
1314
1315 static void
1316 spcc_connector_set_subsequent_point(SPConnectorContext *const cc, Geom::Point const p)
1317 {
1318     g_assert( cc->npoints != 0 );
1319
1320     SPDesktop *dt = cc->desktop;
1321     Geom::Point o = dt->dt2doc(cc->p[0]);
1322     Geom::Point d = dt->dt2doc(p);
1323     Avoid::Point src(o[Geom::X], o[Geom::Y]);
1324     Avoid::Point dst(d[Geom::X], d[Geom::Y]);
1325
1326     if (!cc->newConnRef) {
1327         Avoid::Router *router = sp_desktop_document(dt)->router;
1328         cc->newConnRef = new Avoid::ConnRef(router);
1329         cc->newConnRef->setEndpoint(Avoid::VertID::src, src);
1330         if (cc->isOrthogonal)
1331             cc->newConnRef->setRoutingType(Avoid::ConnType_Orthogonal);
1332         else
1333             cc->newConnRef->setRoutingType(Avoid::ConnType_PolyLine);
1334     }
1335     // Set new endpoint.
1336     cc->newConnRef->setEndpoint(Avoid::VertID::tar, dst);
1337     // Immediately generate new routes for connector.
1338     cc->newConnRef->makePathInvalid();
1339     cc->newConnRef->router()->processTransaction();
1340     // Recreate curve from libavoid route.
1341     recreateCurve( cc->red_curve, cc->newConnRef, cc->curvature );
1342     cc->red_curve->transform(dt->doc2dt());
1343     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
1344 }
1345
1346
1347 /**
1348  * Concats red, blue and green.
1349  * If any anchors are defined, process these, optionally removing curves from white list
1350  * Invoke _flush_white to write result back to object.
1351  */
1352 static void
1353 spcc_concat_colors_and_flush(SPConnectorContext *cc)
1354 {
1355     SPCurve *c = cc->green_curve;
1356     cc->green_curve = new SPCurve();
1357
1358     cc->red_curve->reset();
1359     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1360
1361     if (c->is_empty()) {
1362         c->unref();
1363         return;
1364     }
1365
1366     spcc_flush_white(cc, c);
1367
1368     c->unref();
1369 }
1370
1371
1372 /*
1373  * Flushes white curve(s) and additional curve into object
1374  *
1375  * No cleaning of colored curves - this has to be done by caller
1376  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
1377  *
1378  */
1379
1380 static void
1381 spcc_flush_white(SPConnectorContext *cc, SPCurve *gc)
1382 {
1383     SPCurve *c;
1384
1385     if (gc) {
1386         c = gc;
1387         c->ref();
1388     } else {
1389         return;
1390     }
1391
1392     /* Now we have to go back to item coordinates at last */
1393     c->transform(SP_EVENT_CONTEXT_DESKTOP(cc)->dt2doc());
1394
1395     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1396     SPDocument *doc = sp_desktop_document(desktop);
1397     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
1398
1399     if ( c && !c->is_empty() ) {
1400         /* We actually have something to write */
1401
1402         Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
1403         /* Set style */
1404         sp_desktop_apply_style_tool(desktop, repr, "/tools/connector", false);
1405
1406         gchar *str = sp_svg_write_path( c->get_pathvector() );
1407         g_assert( str != NULL );
1408         repr->setAttribute("d", str);
1409         g_free(str);
1410
1411         /* Attach repr */
1412         cc->newconn = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
1413         cc->newconn->transform = sp_item_i2doc_affine(SP_ITEM(desktop->currentLayer())).inverse();
1414
1415         bool connection = false;
1416         sp_object_setAttribute(cc->newconn, "inkscape:connector-type",
1417                 cc->isOrthogonal ? "orthogonal" : "polyline", false);
1418         sp_object_setAttribute(cc->newconn, "inkscape:connector-curvature",
1419                 Glib::Ascii::dtostr(cc->curvature).c_str(), false);
1420         if (cc->sid)
1421         {
1422             sp_object_setAttribute(cc->newconn, "inkscape:connection-start",
1423                     cc->sid, false);
1424             connection = true;
1425         }
1426
1427         if (cc->eid)
1428         {
1429             sp_object_setAttribute(cc->newconn, "inkscape:connection-end",
1430                     cc->eid, false);
1431             connection = true;
1432         }
1433         // Process pending updates.
1434         cc->newconn->updateRepr();
1435         sp_document_ensure_up_to_date(doc);
1436
1437         if (connection) {
1438             // Adjust endpoints to shape edge.
1439             sp_conn_reroute_path_immediate(SP_PATH(cc->newconn));
1440             cc->newconn->updateRepr();
1441         }
1442
1443         // Only set the selection after we are finished with creating the attributes of
1444         // the connector.  Otherwise, the selection change may alter the defaults for
1445         // values like curvature in the connector context, preventing subsequent lookup
1446         // of their original values.
1447         cc->selection->set(repr);
1448         Inkscape::GC::release(repr);
1449     }
1450
1451     c->unref();
1452
1453     sp_document_done(doc, SP_VERB_CONTEXT_CONNECTOR, _("Create connector"));
1454 }
1455
1456
1457 static void
1458 spcc_connector_finish_segment(SPConnectorContext *const cc, Geom::Point const /*p*/)
1459 {
1460     if (!cc->red_curve->is_empty()) {
1461         cc->green_curve->append_continuous(cc->red_curve, 0.0625);
1462
1463         cc->p[0] = cc->p[3];
1464         cc->p[1] = cc->p[4];
1465         cc->npoints = 2;
1466
1467         cc->red_curve->reset();
1468     }
1469 }
1470
1471
1472 static void
1473 spcc_connector_finish(SPConnectorContext *const cc)
1474 {
1475     SPDesktop *const desktop = cc->desktop;
1476     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Finishing connector"));
1477
1478     cc->red_curve->reset();
1479     spcc_concat_colors_and_flush(cc);
1480
1481     cc->npoints = 0;
1482
1483     if (cc->newConnRef) {
1484         cc->newConnRef->removeFromGraph();
1485         delete cc->newConnRef;
1486         cc->newConnRef = NULL;
1487     }
1488 }
1489
1490
1491 static gboolean
1492 cc_generic_knot_handler(SPCanvasItem *, GdkEvent *event, SPKnot *knot)
1493 {
1494     g_assert (knot != NULL);
1495
1496     g_object_ref(knot);
1497
1498     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(
1499             knot->desktop->event_context);
1500
1501     gboolean consumed = FALSE;
1502
1503     gchar* knot_tip = knot->tip ? knot->tip : cc->knot_tip;
1504     switch (event->type) {
1505         case GDK_ENTER_NOTIFY:
1506             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, TRUE);
1507
1508             cc->active_handle = knot;
1509             if (knot_tip)
1510             {
1511                 knot->desktop->event_context->defaultMessageContext()->set(
1512                         Inkscape::NORMAL_MESSAGE, knot_tip);
1513             }
1514
1515             consumed = TRUE;
1516             break;
1517         case GDK_LEAVE_NOTIFY:
1518             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, FALSE);
1519
1520             cc->active_handle = NULL;
1521
1522             if (knot_tip) {
1523                 knot->desktop->event_context->defaultMessageContext()->clear();
1524             }
1525
1526             consumed = TRUE;
1527             break;
1528         default:
1529             break;
1530     }
1531
1532     g_object_unref(knot);
1533
1534     return consumed;
1535 }
1536
1537
1538 static gboolean
1539 endpt_handler(SPKnot */*knot*/, GdkEvent *event, SPConnectorContext *cc)
1540 {
1541     g_assert( SP_IS_CONNECTOR_CONTEXT(cc) );
1542
1543     gboolean consumed = FALSE;
1544
1545     switch (event->type) {
1546         case GDK_BUTTON_PRESS:
1547             g_assert( (cc->active_handle == cc->endpt_handle[0]) ||
1548                       (cc->active_handle == cc->endpt_handle[1]) );
1549             if (cc->state == SP_CONNECTOR_CONTEXT_IDLE) {
1550                 cc->clickeditem = cc->active_conn;
1551                 cc->clickedhandle = cc->active_handle;
1552                 cc_clear_active_conn(cc);
1553                 cc->state = SP_CONNECTOR_CONTEXT_REROUTING;
1554
1555                 // Disconnect from attached shape
1556                 unsigned ind = (cc->active_handle == cc->endpt_handle[0]) ? 0 : 1;
1557                 sp_conn_end_detach(cc->clickeditem, ind);
1558
1559                 Geom::Point origin;
1560                 if (cc->clickedhandle == cc->endpt_handle[0]) {
1561                     origin = cc->endpt_handle[1]->pos;
1562                 }
1563                 else {
1564                     origin = cc->endpt_handle[0]->pos;
1565                 }
1566
1567                 // Show the red path for dragging.
1568                 cc->red_curve = SP_PATH(cc->clickeditem)->original_curve ? SP_PATH(cc->clickeditem)->original_curve->copy() : SP_PATH(cc->clickeditem)->curve->copy();
1569                 Geom::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
1570                 cc->red_curve->transform(i2d);
1571                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
1572
1573                 cc->clickeditem->setHidden(true);
1574
1575                 // The rest of the interaction rerouting the connector is
1576                 // handled by the context root handler.
1577                 consumed = TRUE;
1578             }
1579             break;
1580         default:
1581             break;
1582     }
1583
1584     return consumed;
1585 }
1586
1587 static void cc_active_shape_add_knot(SPDesktop* desktop, SPItem* item, ConnectionPointMap &cphandles, ConnectionPoint& cp)
1588 {
1589         SPKnot *knot = sp_knot_new(desktop, 0);
1590
1591         knot->setShape(SP_KNOT_SHAPE_SQUARE);
1592         knot->setSize(8);
1593         knot->setAnchor(GTK_ANCHOR_CENTER);
1594         knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1595         sp_knot_update_ctrl(knot);
1596
1597         // We don't want to use the standard knot handler.
1598         g_signal_handler_disconnect(G_OBJECT(knot->item),
1599                 knot->_event_handler_id);
1600         knot->_event_handler_id = 0;
1601
1602         gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1603                 GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1604         sp_knot_set_position(knot, item->avoidRef->getConnectionPointPos(cp.type, cp.id) * desktop->doc2dt(), 0);
1605         sp_knot_show(knot);
1606         cphandles[knot] = cp;
1607 }
1608
1609 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item)
1610 {
1611     g_assert(item != NULL );
1612
1613     std::map<int, ConnectionPoint>* connpts = &item->avoidRef->connection_points;
1614
1615     if (cc->active_shape != item)
1616     {
1617         // The active shape has changed
1618         // Rebuild everything
1619         cc->active_shape = item;
1620         // Remove existing active shape listeners
1621         if (cc->active_shape_repr) {
1622             sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
1623             Inkscape::GC::release(cc->active_shape_repr);
1624
1625             sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
1626             Inkscape::GC::release(cc->active_shape_layer_repr);
1627         }
1628
1629         // Listen in case the active shape changes
1630         cc->active_shape_repr = SP_OBJECT_REPR(item);
1631         if (cc->active_shape_repr) {
1632             Inkscape::GC::anchor(cc->active_shape_repr);
1633             sp_repr_add_listener(cc->active_shape_repr, &shape_repr_events, cc);
1634
1635             cc->active_shape_layer_repr = cc->active_shape_repr->parent();
1636             Inkscape::GC::anchor(cc->active_shape_layer_repr);
1637             sp_repr_add_listener(cc->active_shape_layer_repr, &layer_repr_events, cc);
1638         }
1639
1640
1641         // Set the connection points.
1642         if ( cc->connpthandles.size() )
1643             // destroy the old list
1644             while (! cc->connpthandles.empty() )
1645             {
1646                 g_object_unref(cc->connpthandles.begin()->first);
1647                 cc->connpthandles.erase(cc->connpthandles.begin());
1648             }
1649         // build the new one
1650         if ( connpts->size() )
1651         for (std::map<int, ConnectionPoint>::iterator it = connpts->begin(); it != connpts->end(); ++it)
1652             cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, it->second);
1653
1654         // Also add default connection points
1655         // For now, only centre default connection point will
1656         // be available
1657         ConnectionPoint centre;
1658         centre.type = ConnPointDefault;
1659         centre.id = ConnPointPosCC;
1660         cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, centre);
1661     }
1662     else
1663     {
1664         // The active shape didn't change
1665         // Update only the connection point knots
1666
1667         // Ensure the item's connection_points map
1668         // has been updated
1669         sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
1670
1671         std::set<int> seen;
1672         for  ( ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end() ;)
1673         {
1674             bool removed = false;
1675             if ( it->second.type == ConnPointUserDefined )
1676             {
1677                 std::map<int, ConnectionPoint>::iterator p = connpts->find(it->second.id);
1678                 if (p != connpts->end())
1679                 {
1680                     if ( it->second != p->second )
1681                         // Connection point position has changed
1682                         // Update knot position
1683                         sp_knot_set_position(it->first,
1684                                              item->avoidRef->getConnectionPointPos(it->second.type, it->second.id) * cc->desktop->doc2dt(), 0);
1685                     seen.insert(it->second.id);
1686                     sp_knot_show(it->first);
1687                 }
1688                 else
1689                 {
1690                     // This connection point does no longer exist,
1691                     // remove the knot
1692                     ConnectionPointMap::iterator curr = it;
1693                     ++it;
1694                     g_object_unref( curr->first );
1695                     cc->connpthandles.erase(curr);
1696                     removed = true;
1697                 }
1698             }
1699             else
1700             {
1701                 // It's a default connection point
1702                 // Just make sure it's position is correct
1703                 sp_knot_set_position(it->first,
1704                                      item->avoidRef->getConnectionPointPos(it->second.type, it->second.id) * cc->desktop->doc2dt(), 0);
1705                 sp_knot_show(it->first);
1706
1707             }
1708             if ( !removed )
1709                 ++it;
1710         }
1711         // Add knots for new connection points.
1712         if (connpts->size())
1713             for ( std::map<int, ConnectionPoint>::iterator it = connpts->begin(); it != connpts->end(); ++it )
1714                 if ( seen.find(it->first) == seen.end() )
1715                     // A new connection point has been added
1716                     // to the shape. Add a knot for it.
1717                     cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, it->second);
1718     }
1719 }
1720
1721
1722 static void
1723 cc_set_active_conn(SPConnectorContext *cc, SPItem *item)
1724 {
1725     g_assert( SP_IS_PATH(item) );
1726
1727     SPCurve *curve = SP_PATH(item)->original_curve ? SP_PATH(item)->original_curve : SP_PATH(item)->curve;
1728     Geom::Matrix i2d = sp_item_i2d_affine(item);
1729
1730     if (cc->active_conn == item)
1731     {
1732         // Just adjust handle positions.
1733         Geom::Point startpt = *(curve->first_point()) * i2d;
1734         sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1735
1736         Geom::Point endpt = *(curve->last_point()) * i2d;
1737         sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1738
1739         return;
1740     }
1741
1742     cc->active_conn = item;
1743
1744     // Remove existing active conn listeners
1745     if (cc->active_conn_repr) {
1746         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
1747         Inkscape::GC::release(cc->active_conn_repr);
1748         cc->active_conn_repr = NULL;
1749     }
1750
1751     // Listen in case the active conn changes
1752     cc->active_conn_repr = SP_OBJECT_REPR(item);
1753     if (cc->active_conn_repr) {
1754         Inkscape::GC::anchor(cc->active_conn_repr);
1755         sp_repr_add_listener(cc->active_conn_repr, &shape_repr_events, cc);
1756     }
1757
1758     for (int i = 0; i < 2; ++i) {
1759
1760         // Create the handle if it doesn't exist
1761         if ( cc->endpt_handle[i] == NULL ) {
1762             SPKnot *knot = sp_knot_new(cc->desktop,
1763                     _("<b>Connector endpoint</b>: drag to reroute or connect to new shapes"));
1764
1765             knot->setShape(SP_KNOT_SHAPE_SQUARE);
1766             knot->setSize(7);
1767             knot->setAnchor(GTK_ANCHOR_CENTER);
1768             knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1769             knot->setStroke(0x000000ff, 0x000000ff, 0x000000ff);
1770             sp_knot_update_ctrl(knot);
1771
1772             // We don't want to use the standard knot handler,
1773             // since we don't want this knot to be draggable.
1774             g_signal_handler_disconnect(G_OBJECT(knot->item),
1775                     knot->_event_handler_id);
1776             knot->_event_handler_id = 0;
1777
1778             gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1779                     GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1780
1781             cc->endpt_handle[i] = knot;
1782         }
1783
1784         // Remove any existing handlers
1785         if (cc->endpt_handler_id[i]) {
1786             g_signal_handlers_disconnect_by_func(
1787                     G_OBJECT(cc->endpt_handle[i]->item),
1788                     (void*)G_CALLBACK(endpt_handler), (gpointer) cc );
1789             cc->endpt_handler_id[i] = 0;
1790         }
1791
1792         // Setup handlers for connector endpoints, this is
1793         // is as 'after' so that cc_generic_knot_handler is
1794         // triggered first for any endpoint.
1795         cc->endpt_handler_id[i] = g_signal_connect_after(
1796                 G_OBJECT(cc->endpt_handle[i]->item), "event",
1797                 G_CALLBACK(endpt_handler), cc);
1798     }
1799
1800     Geom::Point startpt = *(curve->first_point()) * i2d;
1801     sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1802
1803     Geom::Point endpt = *(curve->last_point()) * i2d;
1804     sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1805
1806     sp_knot_show(cc->endpt_handle[0]);
1807     sp_knot_show(cc->endpt_handle[1]);
1808 }
1809
1810 void cc_create_connection_point(SPConnectorContext* cc)
1811 {
1812     if (cc->active_shape && cc->state == SP_CONNECTOR_CONTEXT_IDLE)
1813     {
1814         if (cc->selected_handle)
1815         {
1816             cc_deselect_handle( cc->selected_handle );
1817         }
1818         SPKnot *knot = sp_knot_new(cc->desktop, 0);
1819         // We do not process events on this knot.
1820         g_signal_handler_disconnect(G_OBJECT(knot->item),
1821                                     knot->_event_handler_id);
1822         knot->_event_handler_id = 0;
1823
1824         cc_select_handle( knot );
1825         cc->selected_handle = knot;
1826         sp_knot_show(cc->selected_handle);
1827         cc->state = SP_CONNECTOR_CONTEXT_NEWCONNPOINT;
1828     }
1829 }
1830
1831 void cc_remove_connection_point(SPConnectorContext* cc)
1832 {
1833     if (cc->selected_handle && cc->state == SP_CONNECTOR_CONTEXT_IDLE )
1834     {
1835         cc->active_shape->avoidRef->deleteConnectionPoint(cc->connpthandles[cc->selected_handle]);
1836         cc->selected_handle = NULL;
1837     }
1838 }
1839
1840 static bool cc_item_is_shape(SPItem *item)
1841 {
1842     if (SP_IS_PATH(item)) {
1843         SPCurve *curve = (SP_SHAPE(item))->curve;
1844         if ( curve && !(curve->is_closed()) ) {
1845             // Open paths are connectors.
1846             return false;
1847         }
1848     }
1849     else if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
1850         Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1851         if (prefs->getBool("/tools/connector/ignoretext", true)) {
1852             // Don't count text as a shape we can connect connector to.
1853             return false;
1854         }
1855     }
1856     return true;
1857 }
1858
1859
1860 bool cc_item_is_connector(SPItem *item)
1861 {
1862     if (SP_IS_PATH(item)) {
1863         if (SP_PATH(item)->connEndPair.isAutoRoutingConn()) {
1864             g_assert( SP_PATH(item)->original_curve ? !(SP_PATH(item)->original_curve->is_closed()) : !(SP_PATH(item)->curve->is_closed()) );
1865             return true;
1866         }
1867     }
1868     return false;
1869 }
1870
1871
1872 void cc_selection_set_avoid(bool const set_avoid)
1873 {
1874     SPDesktop *desktop = inkscape_active_desktop();
1875     if (desktop == NULL) {
1876         return;
1877     }
1878
1879     SPDocument *document = sp_desktop_document(desktop);
1880
1881     Inkscape::Selection *selection = sp_desktop_selection(desktop);
1882
1883     GSList *l = (GSList *) selection->itemList();
1884
1885     int changes = 0;
1886
1887     while (l) {
1888         SPItem *item = (SPItem *) l->data;
1889
1890         char const *value = (set_avoid) ? "true" : NULL;
1891
1892         if (cc_item_is_shape(item)) {
1893             sp_object_setAttribute(item, "inkscape:connector-avoid",
1894                     value, false);
1895             item->avoidRef->handleSettingChange();
1896             changes++;
1897         }
1898
1899         l = l->next;
1900     }
1901
1902     if (changes == 0) {
1903         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE,
1904                 _("Select <b>at least one non-connector object</b>."));
1905         return;
1906     }
1907
1908     char *event_desc = (set_avoid) ?
1909             _("Make connectors avoid selected objects") :
1910             _("Make connectors ignore selected objects");
1911     sp_document_done(document, SP_VERB_CONTEXT_CONNECTOR, event_desc);
1912 }
1913
1914
1915 static void
1916 cc_selection_changed(Inkscape::Selection *selection, gpointer data)
1917 {
1918     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1919     //SPEventContext *ec = SP_EVENT_CONTEXT(cc);
1920
1921     SPItem *item = selection->singleItem();
1922
1923     if (cc->active_conn == item)
1924     {
1925         // Nothing to change.
1926         return;
1927     }
1928     if (item == NULL)
1929     {
1930         cc_clear_active_conn(cc);
1931         return;
1932     }
1933
1934     if (cc_item_is_connector(item)) {
1935         cc_set_active_conn(cc, item);
1936     }
1937 }
1938
1939
1940 static void
1941 shape_event_attr_deleted(Inkscape::XML::Node */*repr*/, Inkscape::XML::Node *child,
1942                          Inkscape::XML::Node */*ref*/, gpointer data)
1943 {
1944     g_assert(data);
1945     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1946
1947     if (child == cc->active_shape_repr) {
1948         // The active shape has been deleted.  Clear active shape.
1949         cc_clear_active_shape(cc);
1950     }
1951 }
1952
1953
1954 static void
1955 shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
1956                          gchar const */*old_value*/, gchar const */*new_value*/,
1957                          bool /*is_interactive*/, gpointer data)
1958 {
1959     g_assert(data);
1960     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1961
1962     // Look for changes that result in onscreen movement.
1963     if (!strcmp(name, "d") || !strcmp(name, "x") || !strcmp(name, "y") ||
1964             !strcmp(name, "width") || !strcmp(name, "height") ||
1965             !strcmp(name, "transform"))
1966     {
1967         if (repr == cc->active_shape_repr) {
1968             // Active shape has moved. Clear active shape.
1969             cc_clear_active_shape(cc);
1970         }
1971         else if (repr == cc->active_conn_repr) {
1972             // The active conn has been moved.
1973             // Set it again, which just sets new handle positions.
1974             cc_set_active_conn(cc, cc->active_conn);
1975         }
1976     }
1977     else
1978         if ( !strcmp(name, "inkscape:connection-points") )
1979             if (repr == cc->active_shape_repr)
1980                 // The connection points of the active shape
1981                 // have changed. Update them.
1982                 cc_set_active_shape(cc, cc->active_shape);
1983 }
1984
1985
1986 /*
1987   Local Variables:
1988   mode:c++
1989   c-file-style:"stroustrup"
1990   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1991   indent-tabs-mode:nil
1992   fill-column:99
1993   End:
1994 */
1995 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :