src/connector-context.cpp

   1 /*
   2  * Connector creation tool
   3  *
   4  * Authors:
   5  *   Michael Wybrow <mjwybrow@users.sourceforge.net>
   6  *
   7  * Copyright (C) 2005 Michael Wybrow
   8  *
   9  * Released under GNU GPL, read the file 'COPYING' for more information
  10  *
  11  * TODO:
  12  *  o  Have shapes avoid coonvex hulls of objects, rather than their
  13  *     bounding box.  Possibly implement the unfinished ConvexHull
  14  *     class in libnr.
  15  *     (HOWEVER, using the convex hull C of a shape S does the wrong thing if a
  16  *     connector starts outside of S but inside C, or if the best route around
  17  *     an object involves going inside C but without entering S.)
  18  *  o  Draw connectors to shape edges rather than bounding box.
  19  *  o  Show a visual indicator for objects with the 'avoid' property set.
  20  *  o  Allow user to change a object between a path and connector through
  21  *     the interface.
  22  *  o  Create an interface for setting markers (arrow heads).
  23  *  o  Better distinguish between paths and connectors to prevent problems
  24  *     in the node tool and paths accidently being turned into connectors
  25  *     in the connector tool.  Perhaps have a way to convert between.
  26  *  o  Only call libavoid's updateEndPoint as required.  Currently we do it
  27  *     for both endpoints, even if only one is moving.
  28  *  o  Allow user-placeable connection points.
  29  *  o  Deal sanely with connectors with both endpoints attached to the
  30  *     same connection point, and drawing of connectors attaching
  31  *     overlaping shapes (currently tries to adjust connector to be
  32  *     outside both bounding boxes).
  33  *  o  Fix many special cases related to connectors updating,
  34  *     e.g., copying a couple of shapes and a connector that are
  35  *           attached to each other.
  36  *     e.g., detach connector when it is moved or transformed in
  37  *           one of the other contexts.
  38  *  o  Cope with shapes whose ids change when they have attached
  39  *     connectors.
  40  *  o  gobble_motion_events(GDK_BUTTON1_MASK)?;
  41  *
  42  */
  43
  44 #include <gdk/gdkkeysyms.h>
  45
  46 #include "connector-context.h"
  47 #include "pixmaps/cursor-connector.xpm"
  48 #include "pixmaps/cursor-connector.pixbuf"
  49 #include "xml/node-event-vector.h"
  50 #include "xml/repr.h"
  51 #include "svg/svg.h"
  52 #include "desktop.h"
  53 #include "desktop-style.h"
  54 #include "desktop-affine.h"
  55 #include "desktop-handles.h"
  56 #include "document.h"
  57 #include "message-context.h"
  58 #include "message-stack.h"
  59 #include "selection.h"
  60 #include "inkscape.h"
  61 #include "prefs-utils.h"
  62 #include "sp-path.h"
  63 #include "display/canvas-bpath.h"
  64 #include "display/sodipodi-ctrl.h"
  65 #include <glibmm/i18n.h>
  66 #include "snap.h"
  67 #include "knot.h"
  68 #include "sp-conn-end.h"
  69 #include "conn-avoid-ref.h"
  70 #include "libavoid/vertices.h"
  71 #include "context-fns.h"
  72 #include "sp-namedview.h"
  73 #include "sp-text.h"
  74 #include "sp-flowtext.h"
  75
  76
  77 static void sp_connector_context_class_init(SPConnectorContextClass *klass);
  78 static void sp_connector_context_init(SPConnectorContext *conn_context);
  79 static void sp_connector_context_dispose(GObject *object);
  80
  81 static void sp_connector_context_setup(SPEventContext *ec);
  82 static void sp_connector_context_finish(SPEventContext *ec);
  83 static gint sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event);
  84 static gint sp_connector_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  85
  86 // Stuff borrowed from DrawContext
  87 static void spcc_connector_set_initial_point(SPConnectorContext *cc, NR::Point const p);
  88 static void spcc_connector_set_subsequent_point(SPConnectorContext *cc, NR::Point const p);
  89 static void spcc_connector_finish_segment(SPConnectorContext *cc, NR::Point p);
  90 static void spcc_reset_colors(SPConnectorContext *cc);
  91 static void spcc_connector_finish(SPConnectorContext *cc);
  92 static void spcc_concat_colors_and_flush(SPConnectorContext *cc);
  93 static void spcc_flush_white(SPConnectorContext *cc, SPCurve *gc);
  94
  95 // Context event handlers
  96 static gint connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent);
  97 static gint connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent);
  98 static gint connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent);
  99 static gint connector_handle_key_press(SPConnectorContext *const cc, guint const keyval);
 100
 101 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item);
 102 static void cc_clear_active_shape(SPConnectorContext *cc);
 103 static void cc_set_active_conn(SPConnectorContext *cc, SPItem *item);
 104 static void cc_clear_active_conn(SPConnectorContext *cc);
 105 static gchar *conn_pt_handle_test(SPConnectorContext *cc, NR::Point& w);
 106 static bool cc_item_is_shape(SPItem *item);
 107 static void cc_selection_changed(Inkscape::Selection *selection, gpointer data);
 108
 109 static void shape_event_attr_deleted(Inkscape::XML::Node *repr,
 110         Inkscape::XML::Node *child, Inkscape::XML::Node *ref, gpointer data);
 111 static void shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
 112         gchar const *old_value, gchar const *new_value, bool is_interactive,
 113         gpointer data);
 114
 115
 116 static NR::Point connector_drag_origin_w(0, 0);
 117 static bool connector_within_tolerance = false;
 118 static SPEventContextClass *parent_class;
 119
 120
 121 static Inkscape::XML::NodeEventVector shape_repr_events = {
 122     NULL, /* child_added */
 123     NULL, /* child_added */
 124     shape_event_attr_changed,
 125     NULL, /* content_changed */
 126     NULL  /* order_changed */
 127 };
 128
 129 static Inkscape::XML::NodeEventVector layer_repr_events = {
 130     NULL, /* child_added */
 131     shape_event_attr_deleted,
 132     NULL, /* child_added */
 133     NULL, /* content_changed */
 134     NULL  /* order_changed */
 135 };
 136
 137
 138 GType
 139 sp_connector_context_get_type(void)
 140 {
 141     static GType type = 0;
 142     if (!type) {
 143         GTypeInfo info = {
 144             sizeof(SPConnectorContextClass),
 145             NULL, NULL,
 146             (GClassInitFunc) sp_connector_context_class_init,
 147             NULL, NULL,
 148             sizeof(SPConnectorContext),
 149             4,
 150             (GInstanceInitFunc) sp_connector_context_init,
 151             NULL,   /* value_table */
 152         };
 153         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPConnectorContext", &info, (GTypeFlags)0);
 154     }
 155     return type;
 156 }
 157
 158 static void
 159 sp_connector_context_class_init(SPConnectorContextClass *klass)
 160 {
 161     GObjectClass *object_class;
 162     SPEventContextClass *event_context_class;
 163
 164     object_class = (GObjectClass *) klass;
 165     event_context_class = (SPEventContextClass *) klass;
 166
 167     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 168
 169     object_class->dispose = sp_connector_context_dispose;
 170
 171     event_context_class->setup = sp_connector_context_setup;
 172     event_context_class->finish = sp_connector_context_finish;
 173     event_context_class->root_handler = sp_connector_context_root_handler;
 174     event_context_class->item_handler = sp_connector_context_item_handler;
 175 }
 176
 177
 178 static void
 179 sp_connector_context_init(SPConnectorContext *cc)
 180 {
 181     SPEventContext *ec = SP_EVENT_CONTEXT(cc);
 182
 183     ec->cursor_shape = cursor_connector_xpm;
 184     ec->cursor_pixbuf = gdk_pixbuf_new_from_inline(
 185             -1,
 186             cursor_connector_pixbuf,
 187             FALSE,
 188             NULL);
 189     ec->hot_x = 1;
 190     ec->hot_y = 1;
 191     ec->xp = 0;
 192     ec->yp = 0;
 193
 194     cc->red_color = 0xff00007f;
 195
 196     cc->newconn = NULL;
 197     cc->newConnRef = NULL;
 198
 199     cc->sel_changed_connection = sigc::connection();
 200
 201     cc->active_shape = NULL;
 202     cc->active_shape_repr = NULL;
 203     cc->active_shape_layer_repr = NULL;
 204
 205     cc->active_conn = NULL;
 206     cc->active_conn_repr = NULL;
 207
 208     cc->active_handle = NULL;
 209
 210     cc->clickeditem = NULL;
 211     cc->clickedhandle = NULL;
 212
 213     cc->connpthandle = NULL;
 214     for (int i = 0; i < 2; ++i) {
 215         cc->endpt_handle[i] = NULL;
 216         cc->endpt_handler_id[i] = 0;
 217     }
 218     cc->sid = NULL;
 219     cc->eid = NULL;
 220     cc->npoints = 0;
 221     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 222 }
 223
 224
 225 static void
 226 sp_connector_context_dispose(GObject *object)
 227 {
 228     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(object);
 229
 230     cc->sel_changed_connection.disconnect();
 231
 232     if (cc->connpthandle) {
 233         g_object_unref(cc->connpthandle);
 234         cc->connpthandle = NULL;
 235     }
 236     for (int i = 0; i < 2; ++i) {
 237         if (cc->endpt_handle[1]) {
 238             g_object_unref(cc->endpt_handle[i]);
 239             cc->endpt_handle[i] = NULL;
 240         }
 241     }
 242     if (cc->sid) {
 243         g_free(cc->sid);
 244         cc->sid = NULL;
 245     }
 246     if (cc->eid) {
 247         g_free(cc->eid);
 248         cc->eid = NULL;
 249     }
 250     g_assert( cc->newConnRef == NULL );
 251
 252     G_OBJECT_CLASS(parent_class)->dispose(object);
 253 }
 254
 255
 256 static void
 257 sp_connector_context_setup(SPEventContext *ec)
 258 {
 259     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 260     SPDesktop *dt = ec->desktop;
 261
 262     if (((SPEventContextClass *) parent_class)->setup) {
 263         ((SPEventContextClass *) parent_class)->setup(ec);
 264     }
 265
 266     cc->selection = sp_desktop_selection(dt);
 267
 268     cc->sel_changed_connection.disconnect();
 269     cc->sel_changed_connection = cc->selection->connectChanged(
 270             sigc::bind(sigc::ptr_fun(&cc_selection_changed),
 271             (gpointer) cc));
 272
 273     /* Create red bpath */
 274     cc->red_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 275     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cc->red_bpath), cc->red_color,
 276             1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 277     sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cc->red_bpath), 0x00000000,
 278             SP_WIND_RULE_NONZERO);
 279     /* Create red curve */
 280     cc->red_curve = sp_curve_new_sized(4);
 281
 282     /* Create green curve */
 283     cc->green_curve = sp_curve_new_sized(64);
 284
 285     // Notice the initial selection.
 286     cc_selection_changed(cc->selection, (gpointer) cc);
 287
 288     if (prefs_get_int_attribute("tools.connector", "selcue", 0) != 0) {
 289         ec->enableSelectionCue();
 290     }
 291
 292     // Make sure we see all enter events for canvas items,
 293     // even if a mouse button is depressed.
 294     dt->canvas->gen_all_enter_events = true;
 295 }
 296
 297
 298 static void
 299 sp_connector_context_finish(SPEventContext *ec)
 300 {
 301     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 302
 303     spcc_connector_finish(cc);
 304
 305     if (((SPEventContextClass *) parent_class)->finish) {
 306         ((SPEventContextClass *) parent_class)->finish(ec);
 307     }
 308
 309     if (cc->selection) {
 310         cc->selection = NULL;
 311     }
 312     cc_clear_active_shape(cc);
 313     cc_clear_active_conn(cc);
 314
 315     // Restore the default event generating behaviour.
 316     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(ec);
 317     desktop->canvas->gen_all_enter_events = false;
 318 }
 319
 320
 321 //-----------------------------------------------------------------------------
 322
 323
 324 static void
 325 cc_clear_active_shape(SPConnectorContext *cc)
 326 {
 327     if (cc->active_shape == NULL) {
 328         return;
 329     }
 330     g_assert( cc->active_shape_repr );
 331     g_assert( cc->active_shape_layer_repr );
 332
 333     cc->active_shape = NULL;
 334
 335     if (cc->active_shape_repr) {
 336         sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
 337         Inkscape::GC::release(cc->active_shape_repr);
 338         cc->active_shape_repr = NULL;
 339
 340         sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
 341         Inkscape::GC::release(cc->active_shape_layer_repr);
 342         cc->active_shape_layer_repr = NULL;
 343     }
 344
 345     // Hide the center connection point if it exists.
 346     if (cc->connpthandle) {
 347         sp_knot_hide(cc->connpthandle);
 348     }
 349 }
 350
 351
 352 static void
 353 cc_clear_active_conn(SPConnectorContext *cc)
 354 {
 355     if (cc->active_conn == NULL) {
 356         return;
 357     }
 358     g_assert( cc->active_conn_repr );
 359
 360     cc->active_conn = NULL;
 361
 362     if (cc->active_conn_repr) {
 363         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
 364         Inkscape::GC::release(cc->active_conn_repr);
 365         cc->active_conn_repr = NULL;
 366     }
 367
 368     // Hide the endpoint handles.
 369     for (int i = 0; i < 2; ++i) {
 370         if (cc->endpt_handle[i]) {
 371             sp_knot_hide(cc->endpt_handle[i]);
 372         }
 373     }
 374 }
 375
 376
 377 static gchar *
 378 conn_pt_handle_test(SPConnectorContext *cc, NR::Point& p)
 379 {
 380     // TODO: this will need to change when there are more connection
 381     //       points available for each shape.
 382
 383     SPKnot *centerpt = cc->connpthandle;
 384     if (cc->active_handle && (cc->active_handle == centerpt))
 385     {
 386         p = centerpt->pos;
 387         return g_strdup_printf("#%s", SP_OBJECT_ID(cc->active_shape));
 388     }
 389     return NULL;
 390 }
 391
 392
 393
 394 static gint
 395 sp_connector_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
 396 {
 397     gint ret = FALSE;
 398
 399     SPDesktop *desktop = ec->desktop;
 400
 401     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 402
 403     NR::Point p(event->button.x, event->button.y);
 404
 405     switch (event->type) {
 406         case GDK_BUTTON_RELEASE:
 407             if (event->button.button == 1) {
 408                 if ((cc->state == SP_CONNECTOR_CONTEXT_DRAGGING) &&
 409                         (connector_within_tolerance))
 410                 {
 411                     spcc_reset_colors(cc);
 412                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 413                 }
 414                 if (cc->state != SP_CONNECTOR_CONTEXT_IDLE) {
 415                     // Doing simething else like rerouting.
 416                     break;
 417                 }
 418                 // find out clicked item, disregarding groups, honoring Alt
 419                 SPItem *item_ungrouped = sp_event_context_find_item(desktop,
 420                         p, event->button.state & GDK_MOD1_MASK, TRUE);
 421
 422                 if (event->button.state & GDK_SHIFT_MASK) {
 423                     cc->selection->toggle(item_ungrouped);
 424                 } else {
 425                     cc->selection->set(item_ungrouped);
 426                 }
 427                 ret = TRUE;
 428             }
 429             break;
 430         case GDK_ENTER_NOTIFY:
 431         {
 432             if (cc_item_is_shape(item)) {
 433                 // This is a shape, so show connection point(s).
 434                 if (!(cc->active_shape) ||
 435                         // Don't show handle for another handle.
 436                         (item != ((SPItem *) cc->connpthandle))) {
 437                     cc_set_active_shape(cc, item);
 438                 }
 439             }
 440             ret = TRUE;
 441             break;
 442         }
 443         default:
 444             break;
 445     }
 446
 447     return ret;
 448 }
 449
 450
 451 gint
 452 sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event)
 453 {
 454     SPConnectorContext *const cc = SP_CONNECTOR_CONTEXT(ec);
 455
 456     gint ret = FALSE;
 457
 458     switch (event->type) {
 459         case GDK_BUTTON_PRESS:
 460             ret = connector_handle_button_press(cc, event->button);
 461             break;
 462
 463         case GDK_MOTION_NOTIFY:
 464             ret = connector_handle_motion_notify(cc, event->motion);
 465             break;
 466
 467         case GDK_BUTTON_RELEASE:
 468             ret = connector_handle_button_release(cc, event->button);
 469             break;
 470         case GDK_KEY_PRESS:
 471             ret = connector_handle_key_press(cc, get_group0_keyval (&event->key));
 472             break;
 473
 474         default:
 475             break;
 476     }
 477
 478     if (!ret) {
 479         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 480             = ((SPEventContextClass *) parent_class)->root_handler;
 481         if (parent_root_handler) {
 482             ret = parent_root_handler(ec, event);
 483         }
 484     }
 485
 486     return ret;
 487 }
 488
 489
 490 static gint
 491 connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent)
 492 {
 493     NR::Point const event_w(bevent.x, bevent.y);
 494     /* Find desktop coordinates */
 495     NR::Point p = cc->desktop->w2d(event_w);
 496
 497     gint ret = FALSE;
 498     if ( bevent.button == 1 ) {
 499
 500         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 501
 502         if (Inkscape::have_viable_layer(desktop, cc->_message_context) == false) {
 503             return TRUE;
 504         }
 505
 506         NR::Point const event_w(bevent.x,
 507                                 bevent.y);
 508         connector_drag_origin_w = event_w;
 509         connector_within_tolerance = true;
 510
 511         NR::Point const event_dt = cc->desktop->w2d(event_w);
 512         switch (cc->state) {
 513             case SP_CONNECTOR_CONTEXT_STOP:
 514                 /* This is allowed, if we just cancelled curve */
 515             case SP_CONNECTOR_CONTEXT_IDLE:
 516             {
 517                 if ( cc->npoints == 0 ) {
 518                     /* Set start anchor */
 519                     NR::Point p;
 520
 521                     cc_clear_active_conn(cc);
 522
 523                     SP_EVENT_CONTEXT_DESKTOP(cc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new connector"));
 524
 525                     /* Create green anchor */
 526                     p = event_dt;
 527
 528                     // Test whether we clicked on a connection point
 529                     cc->sid = conn_pt_handle_test(cc, p);
 530
 531                     if (!cc->sid) {
 532                         // This is the first point, so just snap it to the grid
 533                         // as there's no other points to go off.
 534                         SnapManager const &m = cc->desktop->namedview->snap_manager;
 535                         p = m.freeSnap(Inkscape::Snapper::SNAP_POINT | Inkscape::Snapper::BBOX_POINT,
 536                                        p, NULL).getPoint();
 537                     }
 538                     spcc_connector_set_initial_point(cc, p);
 539
 540                 }
 541                 cc->state = SP_CONNECTOR_CONTEXT_DRAGGING;
 542                 ret = TRUE;
 543                 break;
 544             }
 545             case SP_CONNECTOR_CONTEXT_DRAGGING:
 546             {
 547                 // This is the second click of a connector creation.
 548
 549                 spcc_connector_set_subsequent_point(cc, p);
 550                 spcc_connector_finish_segment(cc, p);
 551                 // Test whether we clicked on a connection point
 552                 cc->eid = conn_pt_handle_test(cc, p);
 553                 if (cc->npoints != 0) {
 554                     spcc_connector_finish(cc);
 555                 }
 556                 cc_set_active_conn(cc, cc->newconn);
 557                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 558                 ret = TRUE;
 559                 break;
 560             }
 561             case SP_CONNECTOR_CONTEXT_CLOSE:
 562             {
 563                 g_warning("Button down in CLOSE state");
 564                 break;
 565             }
 566             default:
 567                 break;
 568         }
 569     } else if (bevent.button == 3) {
 570         if (cc->npoints != 0) {
 571             spcc_connector_finish(cc);
 572             ret = TRUE;
 573         }
 574     }
 575     return ret;
 576 }
 577
 578
 579 static gint
 580 connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent)
 581 {
 582     gint ret = FALSE;
 583
 584     if (mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 585         // allow middle-button scrolling
 586         return FALSE;
 587     }
 588
 589     NR::Point const event_w(mevent.x, mevent.y);
 590
 591     if (connector_within_tolerance) {
 592         gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
 593                                                                "value", 0, 0, 100);
 594         if ( NR::LInfty( event_w - connector_drag_origin_w ) < tolerance ) {
 595             return FALSE;   // Do not drag if we're within tolerance from origin.
 596         }
 597     }
 598     // Once the user has moved farther than tolerance from the original location
 599     // (indicating they intend to move the object, not click), then always process
 600     // the motion notify coordinates as given (no snapping back to origin)
 601     connector_within_tolerance = false;
 602
 603     SPDesktop *const dt = cc->desktop;
 604
 605     /* Find desktop coordinates */
 606     NR::Point p = dt->w2d(event_w);
 607
 608     switch (cc->state) {
 609         case SP_CONNECTOR_CONTEXT_DRAGGING:
 610         {
 611             // This is movement during a connector creation.
 612
 613             if ( cc->npoints > 0 ) {
 614                 cc->selection->clear();
 615                 spcc_connector_set_subsequent_point(cc, p);
 616                 ret = TRUE;
 617             }
 618             break;
 619         }
 620         case SP_CONNECTOR_CONTEXT_REROUTING:
 621         {
 622             g_assert( SP_IS_PATH(cc->clickeditem));
 623
 624             // Update the hidden path
 625             NR::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
 626             NR::Matrix d2i = i2d.inverse();
 627             SPPath *path = SP_PATH(cc->clickeditem);
 628             SPCurve *curve = (SP_SHAPE(path))->curve;
 629             if (cc->clickedhandle == cc->endpt_handle[0]) {
 630                 NR::Point o = cc->endpt_handle[1]->pos;
 631                 sp_curve_stretch_endpoints(curve, p * d2i, o * d2i);
 632             }
 633             else {
 634                 NR::Point o = cc->endpt_handle[0]->pos;
 635                 sp_curve_stretch_endpoints(curve, o * d2i, p * d2i);
 636             }
 637             sp_conn_adjust_path(path);
 638
 639             // Copy this to the temporary visible path
 640             cc->red_curve = sp_curve_copy(SP_SHAPE(path)->curve);
 641             sp_curve_transform(cc->red_curve, i2d);
 642
 643             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 644             ret = TRUE;
 645             break;
 646         }
 647         case SP_CONNECTOR_CONTEXT_STOP:
 648             /* This is perfectly valid */
 649             break;
 650         default:
 651             break;
 652     }
 653
 654     return ret;
 655 }
 656
 657
 658 static gint
 659 connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent)
 660 {
 661     gint ret = FALSE;
 662     if ( revent.button == 1 ) {
 663
 664         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 665         SPDocument *doc = sp_desktop_document(desktop);
 666
 667         NR::Point const event_w(revent.x, revent.y);
 668
 669         /* Find desktop coordinates */
 670         NR::Point p = cc->desktop->w2d(event_w);
 671
 672         switch (cc->state) {
 673             //case SP_CONNECTOR_CONTEXT_POINT:
 674             case SP_CONNECTOR_CONTEXT_DRAGGING:
 675             {
 676                 if (connector_within_tolerance)
 677                 {
 678                     spcc_connector_finish_segment(cc, p);
 679                     return TRUE;
 680                 }
 681                 // Connector has been created via a drag, end it now.
 682                 spcc_connector_set_subsequent_point(cc, p);
 683                 spcc_connector_finish_segment(cc, p);
 684                 // Test whether we clicked on a connection point
 685                 cc->eid = conn_pt_handle_test(cc, p);
 686                 if (cc->npoints != 0) {
 687                     spcc_connector_finish(cc);
 688                 }
 689                 cc_set_active_conn(cc, cc->newconn);
 690                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 691                 break;
 692             }
 693             case SP_CONNECTOR_CONTEXT_REROUTING:
 694             {
 695                 // Clear the temporary path:
 696                 sp_curve_reset(cc->red_curve);
 697                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 698
 699                 // Test whether we clicked on a connection point
 700                 gchar *shape_label = conn_pt_handle_test(cc, p);
 701
 702                 if (shape_label) {
 703                     if (cc->clickedhandle == cc->endpt_handle[0]) {
 704                         sp_object_setAttribute(cc->clickeditem,
 705                                 "inkscape:connection-start",shape_label, false);
 706                     }
 707                     else {
 708                         sp_object_setAttribute(cc->clickeditem,
 709                                 "inkscape:connection-end",shape_label, false);
 710                     }
 711                     g_free(shape_label);
 712                 }
 713                 cc->clickeditem->setHidden(false);
 714                 sp_conn_adjust_path(SP_PATH(cc->clickeditem));
 715                 cc->clickeditem->updateRepr();
 716                 sp_document_done(doc);
 717                 cc_set_active_conn(cc, cc->clickeditem);
 718                 sp_document_ensure_up_to_date(doc);
 719                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 720                 return TRUE;
 721                 break;
 722             }
 723             case SP_CONNECTOR_CONTEXT_STOP:
 724                 /* This is allowed, if we just cancelled curve */
 725                 break;
 726             default:
 727                 break;
 728         }
 729         ret = TRUE;
 730     }
 731
 732     return ret;
 733 }
 734
 735
 736 static gint
 737 connector_handle_key_press(SPConnectorContext *const cc, guint const keyval)
 738 {
 739     gint ret = FALSE;
 740     /* fixme: */
 741     switch (keyval) {
 742         case GDK_Return:
 743         case GDK_KP_Enter:
 744             if (cc->npoints != 0) {
 745                 spcc_connector_finish(cc);
 746                 ret = TRUE;
 747             }
 748             break;
 749         case GDK_Escape:
 750             if (cc->npoints != 0) {
 751                 // if drawing, cancel, otherwise pass it up for deselecting
 752                 cc->state = SP_CONNECTOR_CONTEXT_STOP;
 753                 spcc_reset_colors(cc);
 754                 ret = TRUE;
 755             }
 756             break;
 757         default:
 758             break;
 759     }
 760     return ret;
 761 }
 762
 763
 764 static void
 765 spcc_reset_colors(SPConnectorContext *cc)
 766 {
 767     /* Red */
 768     sp_curve_reset(cc->red_curve);
 769     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 770
 771     sp_curve_reset(cc->green_curve);
 772     cc->npoints = 0;
 773 }
 774
 775
 776 static void
 777 spcc_connector_set_initial_point(SPConnectorContext *const cc, NR::Point const p)
 778 {
 779     g_assert( cc->npoints == 0 );
 780
 781     cc->p[0] = p;
 782     cc->p[1] = p;
 783     cc->npoints = 2;
 784     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 785 }
 786
 787
 788 static void
 789 spcc_connector_set_subsequent_point(SPConnectorContext *const cc, NR::Point const p)
 790 {
 791     g_assert( cc->npoints != 0 );
 792
 793     SPDesktop *dt = cc->desktop;
 794     NR::Point o = dt->dt2doc(cc->p[0]);
 795     NR::Point d = dt->dt2doc(p);
 796     Avoid::Point src = { o[NR::X], o[NR::Y] };
 797     Avoid::Point dst = { d[NR::X], d[NR::Y] };
 798
 799     if (!cc->newConnRef) {
 800         Avoid::Router *router = sp_desktop_document(dt)->router;
 801         cc->newConnRef = new Avoid::ConnRef(router, 0, src, dst);
 802         cc->newConnRef->updateEndPoint(Avoid::VertID::src, src);
 803     }
 804     cc->newConnRef->updateEndPoint(Avoid::VertID::tar, dst);
 805
 806     cc->newConnRef->makePathInvalid();
 807     cc->newConnRef->generatePath(src, dst);
 808
 809     Avoid::PolyLine route = cc->newConnRef->route();
 810     cc->newConnRef->calcRouteDist();
 811
 812     sp_curve_reset(cc->red_curve);
 813     NR::Point pt(route.ps[0].x, route.ps[0].y);
 814     sp_curve_moveto(cc->red_curve, pt);
 815
 816     for (int i = 1; i < route.pn; ++i) {
 817         NR::Point p(route.ps[i].x, route.ps[i].y);
 818         sp_curve_lineto(cc->red_curve, p);
 819     }
 820     sp_curve_transform(cc->red_curve, dt->doc2dt());
 821     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 822 }
 823
 824
 825 /**
 826  * Concats red, blue and green.
 827  * If any anchors are defined, process these, optionally removing curves from white list
 828  * Invoke _flush_white to write result back to object.
 829  */
 830 static void
 831 spcc_concat_colors_and_flush(SPConnectorContext *cc)
 832 {
 833     SPCurve *c = cc->green_curve;
 834     cc->green_curve = sp_curve_new_sized(64);
 835
 836     sp_curve_reset(cc->red_curve);
 837     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 838
 839     if (sp_curve_empty(c)) {
 840         sp_curve_unref(c);
 841         return;
 842     }
 843
 844     spcc_flush_white(cc, c);
 845
 846     sp_curve_unref(c);
 847 }
 848
 849
 850 /*
 851  * Flushes white curve(s) and additional curve into object
 852  *
 853  * No cleaning of colored curves - this has to be done by caller
 854  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
 855  *
 856  */
 857
 858 static void
 859 spcc_flush_white(SPConnectorContext *cc, SPCurve *gc)
 860 {
 861     SPCurve *c;
 862
 863     if (gc) {
 864         c = gc;
 865         sp_curve_ref(c);
 866     } else {
 867         return;
 868     }
 869
 870     /* Now we have to go back to item coordinates at last */
 871     sp_curve_transform(c,
 872             sp_desktop_dt2root_affine(SP_EVENT_CONTEXT_DESKTOP(cc)));
 873
 874     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 875     SPDocument *doc = sp_desktop_document(desktop);
 876
 877     if ( c && !sp_curve_empty(c) ) {
 878         /* We actually have something to write */
 879
 880         Inkscape::XML::Node *repr = sp_repr_new("svg:path");
 881         /* Set style */
 882         sp_desktop_apply_style_tool(desktop, repr, "tools.connector", false);
 883
 884         gchar *str = sp_svg_write_path(SP_CURVE_BPATH(c));
 885         g_assert( str != NULL );
 886         repr->setAttribute("d", str);
 887         g_free(str);
 888
 889         /* Attach repr */
 890         cc->newconn = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 891         cc->selection->set(repr);
 892         Inkscape::GC::release(repr);
 893         cc->newconn->transform = i2i_affine(desktop->currentRoot(), desktop->currentLayer());
 894         cc->newconn->updateRepr();
 895
 896         bool connection = false;
 897         sp_object_setAttribute(cc->newconn, "inkscape:connector-type",
 898                 "polyline", false);
 899         if (cc->sid)
 900         {
 901             sp_object_setAttribute(cc->newconn, "inkscape:connection-start",
 902                     cc->sid, false);
 903             connection = true;
 904         }
 905
 906         if (cc->eid)
 907         {
 908             sp_object_setAttribute(cc->newconn, "inkscape:connection-end",
 909                     cc->eid, false);
 910             connection = true;
 911         }
 912         cc->newconn->updateRepr();
 913         if (connection) {
 914             // Adjust endpoints to shape edge.
 915             sp_conn_adjust_path(SP_PATH(cc->newconn));
 916         }
 917         cc->newconn->updateRepr();
 918     }
 919
 920     sp_curve_unref(c);
 921
 922     /* Flush pending updates */
 923     sp_document_done(doc);
 924     sp_document_ensure_up_to_date(doc);
 925 }
 926
 927
 928 static void
 929 spcc_connector_finish_segment(SPConnectorContext *const cc, NR::Point const p)
 930 {
 931     if (!sp_curve_empty(cc->red_curve)) {
 932         sp_curve_append_continuous(cc->green_curve, cc->red_curve, 0.0625);
 933
 934         cc->p[0] = cc->p[3];
 935         cc->p[1] = cc->p[4];
 936         cc->npoints = 2;
 937
 938         sp_curve_reset(cc->red_curve);
 939     }
 940 }
 941
 942
 943 static void
 944 spcc_connector_finish(SPConnectorContext *const cc)
 945 {
 946     SPDesktop *const desktop = cc->desktop;
 947     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Finishing connector"));
 948
 949     sp_curve_reset(cc->red_curve);
 950     spcc_concat_colors_and_flush(cc);
 951
 952     cc->npoints = 0;
 953
 954     if (cc->newConnRef) {
 955         cc->newConnRef->removeFromGraph();
 956         delete cc->newConnRef;
 957         cc->newConnRef = NULL;
 958     }
 959     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 960 }
 961
 962
 963 static gboolean
 964 cc_generic_knot_handler(SPCanvasItem *, GdkEvent *event, SPKnot *knot)
 965 {
 966     g_assert (knot != NULL);
 967
 968     g_object_ref(knot);
 969
 970     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(
 971             knot->desktop->event_context);
 972
 973     gboolean consumed = FALSE;
 974
 975     switch (event->type) {
 976         case GDK_ENTER_NOTIFY:
 977             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, TRUE);
 978
 979             cc->active_handle = knot;
 980
 981             if (knot->tip)
 982             {
 983                 knot->desktop->event_context->defaultMessageContext()->set(
 984                         Inkscape::NORMAL_MESSAGE, knot->tip);
 985             }
 986
 987             consumed = TRUE;
 988             break;
 989         case GDK_LEAVE_NOTIFY:
 990             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, FALSE);
 991
 992             cc->active_handle = NULL;
 993
 994             if (knot->tip) {
 995                 knot->desktop->event_context->defaultMessageContext()->clear();
 996             }
 997
 998             consumed = TRUE;
 999             break;
1000         default:
1001             break;
1002     }
1003
1004     g_object_unref(knot);
1005
1006     return consumed;
1007 }
1008
1009
1010 static gboolean
1011 endpt_handler(SPKnot *knot, GdkEvent *event, SPConnectorContext *cc)
1012 {
1013     g_assert( SP_IS_CONNECTOR_CONTEXT(cc) );
1014
1015     gboolean consumed = FALSE;
1016
1017     switch (event->type) {
1018         case GDK_BUTTON_PRESS:
1019             g_assert( (cc->active_handle == cc->endpt_handle[0]) ||
1020                       (cc->active_handle == cc->endpt_handle[1]) );
1021             if (cc->state == SP_CONNECTOR_CONTEXT_IDLE) {
1022                 cc->clickeditem = cc->active_conn;
1023                 cc->clickedhandle = cc->active_handle;
1024                 cc_clear_active_conn(cc);
1025                 cc->state = SP_CONNECTOR_CONTEXT_REROUTING;
1026
1027                 // Disconnect from attached shape
1028                 unsigned ind = (cc->active_handle == cc->endpt_handle[0]) ? 0 : 1;
1029                 sp_conn_end_detach(cc->clickeditem, ind);
1030
1031                 NR::Point origin;
1032                 if (cc->clickedhandle == cc->endpt_handle[0]) {
1033                     origin = cc->endpt_handle[1]->pos;
1034                 }
1035                 else {
1036                     origin = cc->endpt_handle[0]->pos;
1037                 }
1038
1039                 // Show the red path for dragging.
1040                 cc->red_curve = sp_curve_copy(SP_PATH(cc->clickeditem)->curve);
1041                 NR::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
1042                 sp_curve_transform(cc->red_curve, i2d);
1043                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath),
1044                         cc->red_curve);
1045
1046                 cc->clickeditem->setHidden(true);
1047
1048                 // The rest of the interaction rerouting the connector is
1049                 // handled by the context root handler.
1050                 consumed = TRUE;
1051             }
1052             break;
1053         default:
1054             break;
1055     }
1056
1057     return consumed;
1058 }
1059
1060
1061 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item)
1062 {
1063     g_assert(item != NULL );
1064
1065     cc->active_shape = item;
1066
1067     // Remove existing active shape listeners
1068     if (cc->active_shape_repr) {
1069         sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
1070         Inkscape::GC::release(cc->active_shape_repr);
1071
1072         sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
1073         Inkscape::GC::release(cc->active_shape_layer_repr);
1074     }
1075
1076     // Listen in case the active shape changes
1077     cc->active_shape_repr = SP_OBJECT_REPR(item);
1078     if (cc->active_shape_repr) {
1079         Inkscape::GC::anchor(cc->active_shape_repr);
1080         sp_repr_add_listener(cc->active_shape_repr, &shape_repr_events, cc);
1081
1082         cc->active_shape_layer_repr = cc->active_shape_repr->parent();
1083         Inkscape::GC::anchor(cc->active_shape_layer_repr);
1084         sp_repr_add_listener(cc->active_shape_layer_repr, &layer_repr_events, cc);
1085     }
1086
1087
1088     // Set center connection point.
1089     if ( cc->connpthandle == NULL ) {
1090         SPKnot *knot = sp_knot_new(cc->desktop,
1091                 _("<b>Connection point</b>: click or drag to create a new connector"));
1092
1093         knot->setShape(SP_KNOT_SHAPE_SQUARE);
1094         knot->setSize(8);
1095         knot->setAnchor(GTK_ANCHOR_CENTER);
1096         knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1097         sp_knot_update_ctrl(knot);
1098
1099         // We don't want to use the standard knot handler,
1100         //since we don't want this knot to be draggable.
1101         g_signal_handler_disconnect(G_OBJECT(knot->item),
1102                 knot->_event_handler_id);
1103         knot->_event_handler_id = 0;
1104
1105         gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1106                 GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1107
1108         cc->connpthandle = knot;
1109     }
1110
1111
1112     NR::Rect bbox = sp_item_bbox_desktop(cc->active_shape);
1113     NR::Point center = bbox.midpoint();
1114     sp_knot_set_position(cc->connpthandle, &center, 0);
1115
1116     sp_knot_show(cc->connpthandle);
1117
1118 }
1119
1120
1121 static void
1122 cc_set_active_conn(SPConnectorContext *cc, SPItem *item)
1123 {
1124     g_assert( SP_IS_PATH(item) );
1125
1126     SPCurve *curve = SP_SHAPE(SP_PATH(item))->curve;
1127     NR::Matrix i2d = sp_item_i2d_affine(item);
1128
1129     if (cc->active_conn == item)
1130     {
1131         // Just adjust handle positions.
1132         NR::Point startpt = sp_curve_first_point(curve) * i2d;
1133         sp_knot_set_position(cc->endpt_handle[0], &startpt, 0);
1134
1135         NR::Point endpt = sp_curve_last_point(curve) * i2d;
1136         sp_knot_set_position(cc->endpt_handle[1], &endpt, 0);
1137
1138         return;
1139     }
1140
1141     cc->active_conn = item;
1142
1143     // Remove existing active conn listeners
1144     if (cc->active_conn_repr) {
1145         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
1146         Inkscape::GC::release(cc->active_conn_repr);
1147         cc->active_conn_repr = NULL;
1148     }
1149
1150     // Listen in case the active conn changes
1151     cc->active_conn_repr = SP_OBJECT_REPR(item);
1152     if (cc->active_conn_repr) {
1153         Inkscape::GC::anchor(cc->active_conn_repr);
1154         sp_repr_add_listener(cc->active_conn_repr, &shape_repr_events, cc);
1155     }
1156
1157     for (int i = 0; i < 2; ++i) {
1158
1159         // Create the handle if it doesn't exist
1160         if ( cc->endpt_handle[i] == NULL ) {
1161             SPKnot *knot = sp_knot_new(cc->desktop,
1162                     _("<b>Connector endpoint</b>: drag to reroute or connect to new shapes"));
1163
1164             knot->setShape(SP_KNOT_SHAPE_SQUARE);
1165             knot->setSize(7);
1166             knot->setAnchor(GTK_ANCHOR_CENTER);
1167             knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1168             knot->setStroke(0x000000ff, 0x000000ff, 0x000000ff);
1169             sp_knot_update_ctrl(knot);
1170
1171             // We don't want to use the standard knot handler,
1172             //since we don't want this knot to be draggable.
1173             g_signal_handler_disconnect(G_OBJECT(knot->item),
1174                     knot->_event_handler_id);
1175             knot->_event_handler_id = 0;
1176
1177             gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1178                     GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1179
1180             cc->endpt_handle[i] = knot;
1181         }
1182
1183         // Remove any existing handlers
1184         if (cc->endpt_handler_id[i]) {
1185             g_signal_handlers_disconnect_by_func(
1186                     G_OBJECT(cc->endpt_handle[i]->item),
1187                     (void*)G_CALLBACK(endpt_handler), (gpointer) cc );
1188             cc->endpt_handler_id[i] = 0;
1189         }
1190
1191         // Setup handlers for connector endpoints, this is
1192         // is as 'after' so that cc_generic_knot_handler is
1193         // triggered first for any endpoint.
1194         cc->endpt_handler_id[i] = g_signal_connect_after(
1195                 G_OBJECT(cc->endpt_handle[i]->item), "event",
1196                 G_CALLBACK(endpt_handler), cc);
1197     }
1198
1199     NR::Point startpt = sp_curve_first_point(curve) * i2d;
1200     sp_knot_set_position(cc->endpt_handle[0], &startpt, 0);
1201
1202     NR::Point endpt = sp_curve_last_point(curve) * i2d;
1203     sp_knot_set_position(cc->endpt_handle[1], &endpt, 0);
1204
1205     sp_knot_show(cc->endpt_handle[0]);
1206     sp_knot_show(cc->endpt_handle[1]);
1207 }
1208
1209
1210 static bool cc_item_is_shape(SPItem *item)
1211 {
1212     if (SP_IS_PATH(item)) {
1213         SPCurve *curve = (SP_SHAPE(item))->curve;
1214         if ( curve && !(curve->closed) ) {
1215             // Open paths are connectors.
1216             return false;
1217         }
1218     }
1219     else if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
1220         if (prefs_get_int_attribute("tools.connector", "ignoretext", 1) == 1) {
1221             // Don't count text as a shape we can connect connector to.
1222             return false;
1223         }
1224     }
1225     return true;
1226 }
1227
1228
1229 bool cc_item_is_connector(SPItem *item)
1230 {
1231     if (SP_IS_PATH(item)) {
1232         if (SP_PATH(item)->connEndPair.isAutoRoutingConn()) {
1233             g_assert( !(SP_SHAPE(item)->curve->closed) );
1234             return true;
1235         }
1236     }
1237     return false;
1238 }
1239
1240
1241 void cc_selection_set_avoid(bool const set_avoid)
1242 {
1243     SPDesktop *desktop = inkscape_active_desktop();
1244     if (desktop == NULL) {
1245         return;
1246     }
1247
1248     SPDocument *document = sp_desktop_document(desktop);
1249
1250     Inkscape::Selection *selection = sp_desktop_selection(desktop);
1251
1252     GSList *l = (GSList *) selection->itemList();
1253
1254     int changes = 0;
1255
1256     while (l) {
1257         SPItem *item = (SPItem *) l->data;
1258
1259         char const *value = (set_avoid) ? "true" : NULL;
1260
1261         if (cc_item_is_shape(item)) {
1262             sp_object_setAttribute(item, "inkscape:connector-avoid",
1263                     value, false);
1264             item->avoidRef->handleSettingChange();
1265             changes++;
1266         }
1267
1268         l = l->next;
1269     }
1270
1271     if (changes == 0) {
1272         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE,
1273                 _("Select <b>at least one non-connector object</b>."));
1274         return;
1275     }
1276
1277     sp_document_done(document);
1278 }
1279
1280
1281 static void
1282 cc_selection_changed(Inkscape::Selection *selection, gpointer data)
1283 {
1284     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1285     //SPEventContext *ec = SP_EVENT_CONTEXT(cc);
1286
1287     SPItem *item = selection->singleItem();
1288
1289     if (cc->active_conn == item)
1290     {
1291         // Nothing to change.
1292         return;
1293     }
1294     if (item == NULL)
1295     {
1296         cc_clear_active_conn(cc);
1297         return;
1298     }
1299
1300     if (cc_item_is_connector(item)) {
1301         cc_set_active_conn(cc, item);
1302     }
1303 }
1304
1305
1306 static void
1307 shape_event_attr_deleted(Inkscape::XML::Node *repr, Inkscape::XML::Node *child,
1308         Inkscape::XML::Node *ref, gpointer data)
1309 {
1310     g_assert(data);
1311     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1312
1313     if (child == cc->active_shape_repr) {
1314         // The active shape has been deleted.  Clear active shape.
1315         cc_clear_active_shape(cc);
1316     }
1317 }
1318
1319
1320 static void
1321 shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
1322                             gchar const *old_value, gchar const *new_value,
1323                             bool is_interactive, gpointer data)
1324 {
1325     g_assert(data);
1326     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1327
1328     // Look for changes than result in onscreen movement.
1329     if (!strcmp(name, "d") || !strcmp(name, "x") || !strcmp(name, "y") ||
1330             !strcmp(name, "width") || !strcmp(name, "height") ||
1331             !strcmp(name, "transform"))
1332     {
1333         if (repr == cc->active_shape_repr) {
1334             // Active shape has moved. Clear active shape.
1335             cc_clear_active_shape(cc);
1336         }
1337         else if (repr == cc->active_conn_repr) {
1338             // The active conn has been moved.
1339             // Set it again, which just sets new handle positions.
1340             cc_set_active_conn(cc, cc->active_conn);
1341         }
1342     }
1343 }
1344
1345
1346 /*
1347   Local Variables:
1348   mode:c++
1349   c-file-style:"stroustrup"
1350   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1351   indent-tabs-mode:nil
1352   fill-column:99
1353   End:
1354 */
1355 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :