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 convex 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 #include <string>
  46 #include <cstring>
  47
  48 #include "connector-context.h"
  49 #include "pixmaps/cursor-connector.xpm"
  50 #include "xml/node-event-vector.h"
  51 #include "xml/repr.h"
  52 #include "svg/svg.h"
  53 #include "desktop.h"
  54 #include "desktop-style.h"
  55 #include "desktop-affine.h"
  56 #include "desktop-handles.h"
  57 #include "document.h"
  58 #include "message-context.h"
  59 #include "message-stack.h"
  60 #include "selection.h"
  61 #include "inkscape.h"
  62 #include "preferences.h"
  63 #include "sp-path.h"
  64 #include "display/canvas-bpath.h"
  65 #include "display/sodipodi-ctrl.h"
  66 #include <glibmm/i18n.h>
  67 #include "snap.h"
  68 #include "knot.h"
  69 #include "sp-conn-end.h"
  70 #include "conn-avoid-ref.h"
  71 #include "libavoid/vertices.h"
  72 #include "context-fns.h"
  73 #include "sp-namedview.h"
  74 #include "sp-text.h"
  75 #include "sp-flowtext.h"
  76 #include "display/curve.h"
  77
  78 static void sp_connector_context_class_init(SPConnectorContextClass *klass);
  79 static void sp_connector_context_init(SPConnectorContext *conn_context);
  80 static void sp_connector_context_dispose(GObject *object);
  81
  82 static void sp_connector_context_setup(SPEventContext *ec);
  83 static void sp_connector_context_finish(SPEventContext *ec);
  84 static gint sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event);
  85 static gint sp_connector_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  86
  87 // Stuff borrowed from DrawContext
  88 static void spcc_connector_set_initial_point(SPConnectorContext *cc, Geom::Point const p);
  89 static void spcc_connector_set_subsequent_point(SPConnectorContext *cc, Geom::Point const p);
  90 static void spcc_connector_finish_segment(SPConnectorContext *cc, Geom::Point p);
  91 static void spcc_reset_colors(SPConnectorContext *cc);
  92 static void spcc_connector_finish(SPConnectorContext *cc);
  93 static void spcc_concat_colors_and_flush(SPConnectorContext *cc);
  94 static void spcc_flush_white(SPConnectorContext *cc, SPCurve *gc);
  95
  96 // Context event handlers
  97 static gint connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent);
  98 static gint connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent);
  99 static gint connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent);
 100 static gint connector_handle_key_press(SPConnectorContext *const cc, guint const keyval);
 101
 102 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item);
 103 static void cc_clear_active_shape(SPConnectorContext *cc);
 104 static void cc_set_active_conn(SPConnectorContext *cc, SPItem *item);
 105 static void cc_clear_active_conn(SPConnectorContext *cc);
 106 static gchar *conn_pt_handle_test(SPConnectorContext *cc, Geom::Point& w);
 107 static bool cc_item_is_shape(SPItem *item);
 108 static void cc_selection_changed(Inkscape::Selection *selection, gpointer data);
 109 static void cc_connector_rerouting_finish(SPConnectorContext *const cc,
 110         Geom::Point *const p);
 111
 112 static void shape_event_attr_deleted(Inkscape::XML::Node *repr,
 113         Inkscape::XML::Node *child, Inkscape::XML::Node *ref, gpointer data);
 114 static void shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
 115         gchar const *old_value, gchar const *new_value, bool is_interactive,
 116         gpointer data);
 117
 118
 119 static Geom::Point connector_drag_origin_w(0, 0);
 120 static bool connector_within_tolerance = false;
 121 static SPEventContextClass *parent_class;
 122
 123
 124 static Inkscape::XML::NodeEventVector shape_repr_events = {
 125     NULL, /* child_added */
 126     NULL, /* child_added */
 127     shape_event_attr_changed,
 128     NULL, /* content_changed */
 129     NULL  /* order_changed */
 130 };
 131
 132 static Inkscape::XML::NodeEventVector layer_repr_events = {
 133     NULL, /* child_added */
 134     shape_event_attr_deleted,
 135     NULL, /* child_added */
 136     NULL, /* content_changed */
 137     NULL  /* order_changed */
 138 };
 139
 140
 141 GType
 142 sp_connector_context_get_type(void)
 143 {
 144     static GType type = 0;
 145     if (!type) {
 146         GTypeInfo info = {
 147             sizeof(SPConnectorContextClass),
 148             NULL, NULL,
 149             (GClassInitFunc) sp_connector_context_class_init,
 150             NULL, NULL,
 151             sizeof(SPConnectorContext),
 152             4,
 153             (GInstanceInitFunc) sp_connector_context_init,
 154             NULL,   /* value_table */
 155         };
 156         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPConnectorContext", &info, (GTypeFlags)0);
 157     }
 158     return type;
 159 }
 160
 161 static void
 162 sp_connector_context_class_init(SPConnectorContextClass *klass)
 163 {
 164     GObjectClass *object_class;
 165     SPEventContextClass *event_context_class;
 166
 167     object_class = (GObjectClass *) klass;
 168     event_context_class = (SPEventContextClass *) klass;
 169
 170     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 171
 172     object_class->dispose = sp_connector_context_dispose;
 173
 174     event_context_class->setup = sp_connector_context_setup;
 175     event_context_class->finish = sp_connector_context_finish;
 176     event_context_class->root_handler = sp_connector_context_root_handler;
 177     event_context_class->item_handler = sp_connector_context_item_handler;
 178 }
 179
 180
 181 static void
 182 sp_connector_context_init(SPConnectorContext *cc)
 183 {
 184     SPEventContext *ec = SP_EVENT_CONTEXT(cc);
 185
 186     ec->cursor_shape = cursor_connector_xpm;
 187     ec->hot_x = 1;
 188     ec->hot_y = 1;
 189     ec->xp = 0;
 190     ec->yp = 0;
 191
 192     cc->red_color = 0xff00007f;
 193
 194     cc->newconn = NULL;
 195     cc->newConnRef = NULL;
 196
 197     cc->sel_changed_connection = sigc::connection();
 198
 199     cc->active_shape = NULL;
 200     cc->active_shape_repr = NULL;
 201     cc->active_shape_layer_repr = NULL;
 202
 203     cc->active_conn = NULL;
 204     cc->active_conn_repr = NULL;
 205
 206     cc->active_handle = NULL;
 207
 208     cc->clickeditem = NULL;
 209     cc->clickedhandle = NULL;
 210
 211     cc->connpthandle = NULL;
 212     for (int i = 0; i < 2; ++i) {
 213         cc->endpt_handle[i] = NULL;
 214         cc->endpt_handler_id[i] = 0;
 215     }
 216     cc->sid = NULL;
 217     cc->eid = NULL;
 218     cc->npoints = 0;
 219     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 220 }
 221
 222
 223 static void
 224 sp_connector_context_dispose(GObject *object)
 225 {
 226     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(object);
 227
 228     cc->sel_changed_connection.disconnect();
 229
 230     if (cc->connpthandle) {
 231         g_object_unref(cc->connpthandle);
 232         cc->connpthandle = NULL;
 233     }
 234     for (int i = 0; i < 2; ++i) {
 235         if (cc->endpt_handle[1]) {
 236             g_object_unref(cc->endpt_handle[i]);
 237             cc->endpt_handle[i] = NULL;
 238         }
 239     }
 240     if (cc->sid) {
 241         g_free(cc->sid);
 242         cc->sid = NULL;
 243     }
 244     if (cc->eid) {
 245         g_free(cc->eid);
 246         cc->eid = NULL;
 247     }
 248     g_assert( cc->newConnRef == NULL );
 249
 250     G_OBJECT_CLASS(parent_class)->dispose(object);
 251 }
 252
 253
 254 static void
 255 sp_connector_context_setup(SPEventContext *ec)
 256 {
 257     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 258     SPDesktop *dt = ec->desktop;
 259
 260     if (((SPEventContextClass *) parent_class)->setup) {
 261         ((SPEventContextClass *) parent_class)->setup(ec);
 262     }
 263
 264     cc->selection = sp_desktop_selection(dt);
 265
 266     cc->sel_changed_connection.disconnect();
 267     cc->sel_changed_connection = cc->selection->connectChanged(
 268             sigc::bind(sigc::ptr_fun(&cc_selection_changed),
 269             (gpointer) cc));
 270
 271     /* Create red bpath */
 272     cc->red_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 273     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cc->red_bpath), cc->red_color,
 274             1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 275     sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cc->red_bpath), 0x00000000,
 276             SP_WIND_RULE_NONZERO);
 277     /* Create red curve */
 278     cc->red_curve = new SPCurve();
 279
 280     /* Create green curve */
 281     cc->green_curve = new SPCurve();
 282
 283     // Notice the initial selection.
 284     cc_selection_changed(cc->selection, (gpointer) cc);
 285
 286     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 287     if (prefs->getBool("/tools/connector/selcue", 0)) {
 288         ec->enableSelectionCue();
 289     }
 290
 291     // Make sure we see all enter events for canvas items,
 292     // even if a mouse button is depressed.
 293     dt->canvas->gen_all_enter_events = true;
 294 }
 295
 296
 297 static void
 298 sp_connector_context_finish(SPEventContext *ec)
 299 {
 300     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 301
 302     spcc_connector_finish(cc);
 303
 304     if (((SPEventContextClass *) parent_class)->finish) {
 305         ((SPEventContextClass *) parent_class)->finish(ec);
 306     }
 307
 308     if (cc->selection) {
 309         cc->selection = NULL;
 310     }
 311     cc_clear_active_shape(cc);
 312     cc_clear_active_conn(cc);
 313
 314     // Restore the default event generating behaviour.
 315     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(ec);
 316     desktop->canvas->gen_all_enter_events = false;
 317 }
 318
 319
 320 //-----------------------------------------------------------------------------
 321
 322
 323 static void
 324 cc_clear_active_shape(SPConnectorContext *cc)
 325 {
 326     if (cc->active_shape == NULL) {
 327         return;
 328     }
 329     g_assert( cc->active_shape_repr );
 330     g_assert( cc->active_shape_layer_repr );
 331
 332     cc->active_shape = NULL;
 333
 334     if (cc->active_shape_repr) {
 335         sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
 336         Inkscape::GC::release(cc->active_shape_repr);
 337         cc->active_shape_repr = NULL;
 338
 339         sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
 340         Inkscape::GC::release(cc->active_shape_layer_repr);
 341         cc->active_shape_layer_repr = NULL;
 342     }
 343
 344     // Hide the center connection point if it exists.
 345     if (cc->connpthandle) {
 346         sp_knot_hide(cc->connpthandle);
 347     }
 348 }
 349
 350
 351 static void
 352 cc_clear_active_conn(SPConnectorContext *cc)
 353 {
 354     if (cc->active_conn == NULL) {
 355         return;
 356     }
 357     g_assert( cc->active_conn_repr );
 358
 359     cc->active_conn = NULL;
 360
 361     if (cc->active_conn_repr) {
 362         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
 363         Inkscape::GC::release(cc->active_conn_repr);
 364         cc->active_conn_repr = NULL;
 365     }
 366
 367     // Hide the endpoint handles.
 368     for (int i = 0; i < 2; ++i) {
 369         if (cc->endpt_handle[i]) {
 370             sp_knot_hide(cc->endpt_handle[i]);
 371         }
 372     }
 373 }
 374
 375
 376 static gchar *
 377 conn_pt_handle_test(SPConnectorContext *cc, Geom::Point& p)
 378 {
 379     // TODO: this will need to change when there are more connection
 380     //       points available for each shape.
 381
 382     SPKnot *centerpt = cc->connpthandle;
 383     if (cc->active_handle && (cc->active_handle == centerpt))
 384     {
 385         p = centerpt->pos;
 386         return g_strdup_printf("#%s", SP_OBJECT_ID(cc->active_shape));
 387     }
 388     return NULL;
 389 }
 390
 391
 392
 393 static gint
 394 sp_connector_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 395 {
 396     gint ret = FALSE;
 397
 398     SPDesktop *desktop = event_context->desktop;
 399
 400     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(event_context);
 401
 402     Geom::Point p(event->button.x, event->button.y);
 403
 404     switch (event->type) {
 405         case GDK_BUTTON_RELEASE:
 406             if (event->button.button == 1 && !event_context->space_panning) {
 407                 if ((cc->state == SP_CONNECTOR_CONTEXT_DRAGGING) &&
 408                         (connector_within_tolerance))
 409                 {
 410                     spcc_reset_colors(cc);
 411                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 412                 }
 413                 if (cc->state != SP_CONNECTOR_CONTEXT_IDLE) {
 414                     // Doing simething else like rerouting.
 415                     break;
 416                 }
 417                 // find out clicked item, disregarding groups, honoring Alt
 418                 SPItem *item_ungrouped = sp_event_context_find_item(desktop,
 419                         p, event->button.state & GDK_MOD1_MASK, TRUE);
 420
 421                 if (event->button.state & GDK_SHIFT_MASK) {
 422                     cc->selection->toggle(item_ungrouped);
 423                 } else {
 424                     cc->selection->set(item_ungrouped);
 425                 }
 426                 ret = TRUE;
 427             }
 428             break;
 429         case GDK_ENTER_NOTIFY:
 430         {
 431             if (cc_item_is_shape(item)) {
 432                 // This is a shape, so show connection point(s).
 433                 if (!(cc->active_shape) ||
 434                         // Don't show handle for another handle.
 435                         (item != ((SPItem *) cc->connpthandle))) {
 436                     cc_set_active_shape(cc, item);
 437                 }
 438             }
 439             ret = TRUE;
 440             break;
 441         }
 442         default:
 443             break;
 444     }
 445
 446     return ret;
 447 }
 448
 449
 450 gint
 451 sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event)
 452 {
 453     SPConnectorContext *const cc = SP_CONNECTOR_CONTEXT(ec);
 454
 455     gint ret = FALSE;
 456
 457     switch (event->type) {
 458         case GDK_BUTTON_PRESS:
 459             ret = connector_handle_button_press(cc, event->button);
 460             break;
 461
 462         case GDK_MOTION_NOTIFY:
 463             ret = connector_handle_motion_notify(cc, event->motion);
 464             break;
 465
 466         case GDK_BUTTON_RELEASE:
 467             ret = connector_handle_button_release(cc, event->button);
 468             break;
 469         case GDK_KEY_PRESS:
 470             ret = connector_handle_key_press(cc, get_group0_keyval (&event->key));
 471             break;
 472
 473         default:
 474             break;
 475     }
 476
 477     if (!ret) {
 478         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 479             = ((SPEventContextClass *) parent_class)->root_handler;
 480         if (parent_root_handler) {
 481             ret = parent_root_handler(ec, event);
 482         }
 483     }
 484
 485     return ret;
 486 }
 487
 488
 489 static gint
 490 connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent)
 491 {
 492     Geom::Point const event_w(bevent.x, bevent.y);
 493     /* Find desktop coordinates */
 494     Geom::Point p = cc->desktop->w2d(event_w);
 495     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 496
 497     gint ret = FALSE;
 498     if ( bevent.button == 1 && !event_context->space_panning ) {
 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         Geom::Point const event_w(bevent.x,
 507                                 bevent.y);
 508         connector_drag_origin_w = event_w;
 509         connector_within_tolerance = true;
 510
 511         Geom::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                     cc_clear_active_conn(cc);
 519
 520                     SP_EVENT_CONTEXT_DESKTOP(cc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new connector"));
 521
 522                     /* Set start anchor */
 523                     /* Create green anchor */
 524                     Geom::Point p = event_dt;
 525
 526                     // Test whether we clicked on a connection point
 527                     cc->sid = conn_pt_handle_test(cc, p);
 528
 529                     Geom::Point pt2g = to_2geom(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 &m = cc->desktop->namedview->snap_manager;
 535                         m.setup(cc->desktop);
 536                         m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, pt2g);
 537                     }
 538                     spcc_connector_set_initial_point(cc, from_2geom(pt2g));
 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->state == SP_CONNECTOR_CONTEXT_REROUTING) {
 571             // A context menu is going to be triggered here,
 572             // so end the rerouting operation.
 573             cc_connector_rerouting_finish(cc, &p);
 574
 575             cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 576
 577             // Don't set ret to TRUE, so we drop through to the
 578             // parent handler which will open the context menu.
 579         }
 580         else if (cc->npoints != 0) {
 581             spcc_connector_finish(cc);
 582             ret = TRUE;
 583         }
 584     }
 585     return ret;
 586 }
 587
 588
 589 static gint
 590 connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent)
 591 {
 592     gint ret = FALSE;
 593     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 594     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 595
 596     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 597         // allow middle-button scrolling
 598         return FALSE;
 599     }
 600
 601     Geom::Point const event_w(mevent.x, mevent.y);
 602
 603     if (connector_within_tolerance) {
 604         gint const tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 605         if ( NR::LInfty( event_w - connector_drag_origin_w ) < tolerance ) {
 606             return FALSE;   // Do not drag if we're within tolerance from origin.
 607         }
 608     }
 609     // Once the user has moved farther than tolerance from the original location
 610     // (indicating they intend to move the object, not click), then always process
 611     // the motion notify coordinates as given (no snapping back to origin)
 612     connector_within_tolerance = false;
 613
 614     SPDesktop *const dt = cc->desktop;
 615
 616     /* Find desktop coordinates */
 617     Geom::Point p = dt->w2d(event_w);
 618
 619     switch (cc->state) {
 620         case SP_CONNECTOR_CONTEXT_DRAGGING:
 621         {
 622             // This is movement during a connector creation.
 623
 624             if ( cc->npoints > 0 ) {
 625                 cc->selection->clear();
 626                 spcc_connector_set_subsequent_point(cc, p);
 627                 ret = TRUE;
 628             }
 629             break;
 630         }
 631         case SP_CONNECTOR_CONTEXT_REROUTING:
 632         {
 633             g_assert( SP_IS_PATH(cc->clickeditem));
 634
 635             // Update the hidden path
 636             Geom::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
 637             Geom::Matrix d2i = i2d.inverse();
 638             SPPath *path = SP_PATH(cc->clickeditem);
 639             SPCurve *curve = (SP_SHAPE(path))->curve;
 640             if (cc->clickedhandle == cc->endpt_handle[0]) {
 641                 Geom::Point o = cc->endpt_handle[1]->pos;
 642                 curve->stretch_endpoints(p * d2i, o * d2i);
 643             }
 644             else {
 645                 Geom::Point o = cc->endpt_handle[0]->pos;
 646                 curve->stretch_endpoints(o * d2i, p * d2i);
 647             }
 648             sp_conn_adjust_path(path);
 649
 650             // Copy this to the temporary visible path
 651             cc->red_curve = SP_SHAPE(path)->curve->copy();
 652             cc->red_curve->transform(i2d);
 653
 654             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 655             ret = TRUE;
 656             break;
 657         }
 658         case SP_CONNECTOR_CONTEXT_STOP:
 659             /* This is perfectly valid */
 660             break;
 661         default:
 662             break;
 663     }
 664
 665     return ret;
 666 }
 667
 668
 669 static gint
 670 connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent)
 671 {
 672     gint ret = FALSE;
 673     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 674     if ( revent.button == 1 && !event_context->space_panning ) {
 675
 676         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 677         SPDocument *doc = sp_desktop_document(desktop);
 678
 679         Geom::Point const event_w(revent.x, revent.y);
 680
 681         /* Find desktop coordinates */
 682         Geom::Point p = cc->desktop->w2d(event_w);
 683
 684         switch (cc->state) {
 685             //case SP_CONNECTOR_CONTEXT_POINT:
 686             case SP_CONNECTOR_CONTEXT_DRAGGING:
 687             {
 688                 if (connector_within_tolerance)
 689                 {
 690                     spcc_connector_finish_segment(cc, p);
 691                     return TRUE;
 692                 }
 693                 // Connector has been created via a drag, end it now.
 694                 spcc_connector_set_subsequent_point(cc, p);
 695                 spcc_connector_finish_segment(cc, p);
 696                 // Test whether we clicked on a connection point
 697                 cc->eid = conn_pt_handle_test(cc, p);
 698                 if (cc->npoints != 0) {
 699                     spcc_connector_finish(cc);
 700                 }
 701                 cc_set_active_conn(cc, cc->newconn);
 702                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 703                 break;
 704             }
 705             case SP_CONNECTOR_CONTEXT_REROUTING:
 706             {
 707                 cc_connector_rerouting_finish(cc, &p);
 708
 709                 sp_document_ensure_up_to_date(doc);
 710                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 711                 return TRUE;
 712                 break;
 713             }
 714             case SP_CONNECTOR_CONTEXT_STOP:
 715                 /* This is allowed, if we just cancelled curve */
 716                 break;
 717             default:
 718                 break;
 719         }
 720         ret = TRUE;
 721     }
 722
 723     return ret;
 724 }
 725
 726
 727 static gint
 728 connector_handle_key_press(SPConnectorContext *const cc, guint const keyval)
 729 {
 730     gint ret = FALSE;
 731     /* fixme: */
 732     switch (keyval) {
 733         case GDK_Return:
 734         case GDK_KP_Enter:
 735             if (cc->npoints != 0) {
 736                 spcc_connector_finish(cc);
 737                 ret = TRUE;
 738             }
 739             break;
 740         case GDK_Escape:
 741             if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
 742
 743                 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 744                 SPDocument *doc = sp_desktop_document(desktop);
 745
 746                 cc_connector_rerouting_finish(cc, NULL);
 747
 748                 sp_document_undo(doc);
 749
 750                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 751                 desktop->messageStack()->flash( Inkscape::NORMAL_MESSAGE,
 752                         _("Connector endpoint drag cancelled."));
 753                 ret = TRUE;
 754             }
 755             else if (cc->npoints != 0) {
 756                 // if drawing, cancel, otherwise pass it up for deselecting
 757                 cc->state = SP_CONNECTOR_CONTEXT_STOP;
 758                 spcc_reset_colors(cc);
 759                 ret = TRUE;
 760             }
 761             break;
 762         default:
 763             break;
 764     }
 765     return ret;
 766 }
 767
 768
 769 static void
 770 cc_connector_rerouting_finish(SPConnectorContext *const cc, Geom::Point *const p)
 771 {
 772     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 773     SPDocument *doc = sp_desktop_document(desktop);
 774
 775     // Clear the temporary path:
 776     cc->red_curve->reset();
 777     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 778
 779     if (p != NULL)
 780     {
 781         // Test whether we clicked on a connection point
 782         gchar *shape_label = conn_pt_handle_test(cc, *p);
 783
 784         if (shape_label) {
 785             if (cc->clickedhandle == cc->endpt_handle[0]) {
 786                 sp_object_setAttribute(cc->clickeditem,
 787                         "inkscape:connection-start",shape_label, false);
 788             }
 789             else {
 790                 sp_object_setAttribute(cc->clickeditem,
 791                         "inkscape:connection-end",shape_label, false);
 792             }
 793             g_free(shape_label);
 794         }
 795     }
 796     cc->clickeditem->setHidden(false);
 797     sp_conn_adjust_path(SP_PATH(cc->clickeditem));
 798     cc->clickeditem->updateRepr();
 799     sp_document_done(doc, SP_VERB_CONTEXT_CONNECTOR,
 800                      _("Reroute connector"));
 801     cc_set_active_conn(cc, cc->clickeditem);
 802 }
 803
 804
 805 static void
 806 spcc_reset_colors(SPConnectorContext *cc)
 807 {
 808     /* Red */
 809     cc->red_curve->reset();
 810     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 811
 812     cc->green_curve->reset();
 813     cc->npoints = 0;
 814 }
 815
 816
 817 static void
 818 spcc_connector_set_initial_point(SPConnectorContext *const cc, Geom::Point const p)
 819 {
 820     g_assert( cc->npoints == 0 );
 821
 822     cc->p[0] = p;
 823     cc->p[1] = p;
 824     cc->npoints = 2;
 825     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 826 }
 827
 828
 829 static void
 830 spcc_connector_set_subsequent_point(SPConnectorContext *const cc, Geom::Point const p)
 831 {
 832     g_assert( cc->npoints != 0 );
 833
 834     SPDesktop *dt = cc->desktop;
 835     Geom::Point o = dt->dt2doc(cc->p[0]);
 836     Geom::Point d = dt->dt2doc(p);
 837     Avoid::Point src(o[Geom::X], o[Geom::Y]);
 838     Avoid::Point dst(d[Geom::X], d[Geom::Y]);
 839
 840     if (!cc->newConnRef) {
 841         Avoid::Router *router = sp_desktop_document(dt)->router;
 842         cc->newConnRef = new Avoid::ConnRef(router, 0, src, dst);
 843         cc->newConnRef->updateEndPoint(Avoid::VertID::src, src);
 844     }
 845     cc->newConnRef->updateEndPoint(Avoid::VertID::tar, dst);
 846
 847     cc->newConnRef->makePathInvalid();
 848     cc->newConnRef->generatePath(src, dst);
 849
 850     Avoid::PolyLine route = cc->newConnRef->route();
 851     cc->newConnRef->calcRouteDist();
 852
 853     cc->red_curve->reset();
 854     Geom::Point pt(route.ps[0].x, route.ps[0].y);
 855     cc->red_curve->moveto(pt);
 856
 857     for (int i = 1; i < route.pn; ++i) {
 858         Geom::Point p(route.ps[i].x, route.ps[i].y);
 859         cc->red_curve->lineto(p);
 860     }
 861     cc->red_curve->transform(dt->doc2dt());
 862     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 863 }
 864
 865
 866 /**
 867  * Concats red, blue and green.
 868  * If any anchors are defined, process these, optionally removing curves from white list
 869  * Invoke _flush_white to write result back to object.
 870  */
 871 static void
 872 spcc_concat_colors_and_flush(SPConnectorContext *cc)
 873 {
 874     SPCurve *c = cc->green_curve;
 875     cc->green_curve = new SPCurve();
 876
 877     cc->red_curve->reset();
 878     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 879
 880     if (c->is_empty()) {
 881         c->unref();
 882         return;
 883     }
 884
 885     spcc_flush_white(cc, c);
 886
 887     c->unref();
 888 }
 889
 890
 891 /*
 892  * Flushes white curve(s) and additional curve into object
 893  *
 894  * No cleaning of colored curves - this has to be done by caller
 895  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
 896  *
 897  */
 898
 899 static void
 900 spcc_flush_white(SPConnectorContext *cc, SPCurve *gc)
 901 {
 902     SPCurve *c;
 903
 904     if (gc) {
 905         c = gc;
 906         c->ref();
 907     } else {
 908         return;
 909     }
 910
 911     /* Now we have to go back to item coordinates at last */
 912     c->transform(sp_desktop_dt2root_affine(SP_EVENT_CONTEXT_DESKTOP(cc)));
 913
 914     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 915     SPDocument *doc = sp_desktop_document(desktop);
 916     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
 917
 918     if ( c && !c->is_empty() ) {
 919         /* We actually have something to write */
 920
 921         Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 922         /* Set style */
 923         sp_desktop_apply_style_tool(desktop, repr, "/tools/connector", false);
 924
 925         gchar *str = sp_svg_write_path( c->get_pathvector() );
 926         g_assert( str != NULL );
 927         repr->setAttribute("d", str);
 928         g_free(str);
 929
 930         /* Attach repr */
 931         cc->newconn = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 932         cc->selection->set(repr);
 933         Inkscape::GC::release(repr);
 934         cc->newconn->transform = i2i_affine(desktop->currentRoot(), desktop->currentLayer());
 935         cc->newconn->updateRepr();
 936
 937         bool connection = false;
 938         sp_object_setAttribute(cc->newconn, "inkscape:connector-type",
 939                 "polyline", false);
 940         if (cc->sid)
 941         {
 942             sp_object_setAttribute(cc->newconn, "inkscape:connection-start",
 943                     cc->sid, false);
 944             connection = true;
 945         }
 946
 947         if (cc->eid)
 948         {
 949             sp_object_setAttribute(cc->newconn, "inkscape:connection-end",
 950                     cc->eid, false);
 951             connection = true;
 952         }
 953         cc->newconn->updateRepr();
 954         if (connection) {
 955             // Adjust endpoints to shape edge.
 956             sp_conn_adjust_path(SP_PATH(cc->newconn));
 957         }
 958         cc->newconn->updateRepr();
 959     }
 960
 961     c->unref();
 962
 963     /* Flush pending updates */
 964     sp_document_done(doc, SP_VERB_CONTEXT_CONNECTOR, _("Create connector"));
 965     sp_document_ensure_up_to_date(doc);
 966 }
 967
 968
 969 static void
 970 spcc_connector_finish_segment(SPConnectorContext *const cc, Geom::Point const /*p*/)
 971 {
 972     if (!cc->red_curve->is_empty()) {
 973         cc->green_curve->append_continuous(cc->red_curve, 0.0625);
 974
 975         cc->p[0] = cc->p[3];
 976         cc->p[1] = cc->p[4];
 977         cc->npoints = 2;
 978
 979         cc->red_curve->reset();
 980     }
 981 }
 982
 983
 984 static void
 985 spcc_connector_finish(SPConnectorContext *const cc)
 986 {
 987     SPDesktop *const desktop = cc->desktop;
 988     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Finishing connector"));
 989
 990     cc->red_curve->reset();
 991     spcc_concat_colors_and_flush(cc);
 992
 993     cc->npoints = 0;
 994
 995     if (cc->newConnRef) {
 996         cc->newConnRef->removeFromGraph();
 997         delete cc->newConnRef;
 998         cc->newConnRef = NULL;
 999     }
1000     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1001 }
1002
1003
1004 static gboolean
1005 cc_generic_knot_handler(SPCanvasItem *, GdkEvent *event, SPKnot *knot)
1006 {
1007     g_assert (knot != NULL);
1008
1009     g_object_ref(knot);
1010
1011     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(
1012             knot->desktop->event_context);
1013
1014     gboolean consumed = FALSE;
1015
1016     switch (event->type) {
1017         case GDK_ENTER_NOTIFY:
1018             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, TRUE);
1019
1020             cc->active_handle = knot;
1021
1022             if (knot->tip)
1023             {
1024                 knot->desktop->event_context->defaultMessageContext()->set(
1025                         Inkscape::NORMAL_MESSAGE, knot->tip);
1026             }
1027
1028             consumed = TRUE;
1029             break;
1030         case GDK_LEAVE_NOTIFY:
1031             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, FALSE);
1032
1033             cc->active_handle = NULL;
1034
1035             if (knot->tip) {
1036                 knot->desktop->event_context->defaultMessageContext()->clear();
1037             }
1038
1039             consumed = TRUE;
1040             break;
1041         default:
1042             break;
1043     }
1044
1045     g_object_unref(knot);
1046
1047     return consumed;
1048 }
1049
1050
1051 static gboolean
1052 endpt_handler(SPKnot */*knot*/, GdkEvent *event, SPConnectorContext *cc)
1053 {
1054     g_assert( SP_IS_CONNECTOR_CONTEXT(cc) );
1055
1056     gboolean consumed = FALSE;
1057
1058     switch (event->type) {
1059         case GDK_BUTTON_PRESS:
1060             g_assert( (cc->active_handle == cc->endpt_handle[0]) ||
1061                       (cc->active_handle == cc->endpt_handle[1]) );
1062             if (cc->state == SP_CONNECTOR_CONTEXT_IDLE) {
1063                 cc->clickeditem = cc->active_conn;
1064                 cc->clickedhandle = cc->active_handle;
1065                 cc_clear_active_conn(cc);
1066                 cc->state = SP_CONNECTOR_CONTEXT_REROUTING;
1067
1068                 // Disconnect from attached shape
1069                 unsigned ind = (cc->active_handle == cc->endpt_handle[0]) ? 0 : 1;
1070                 sp_conn_end_detach(cc->clickeditem, ind);
1071
1072                 Geom::Point origin;
1073                 if (cc->clickedhandle == cc->endpt_handle[0]) {
1074                     origin = cc->endpt_handle[1]->pos;
1075                 }
1076                 else {
1077                     origin = cc->endpt_handle[0]->pos;
1078                 }
1079
1080                 // Show the red path for dragging.
1081                 cc->red_curve = SP_PATH(cc->clickeditem)->curve->copy();
1082                 Geom::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
1083                 cc->red_curve->transform(i2d);
1084                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
1085
1086                 cc->clickeditem->setHidden(true);
1087
1088                 // The rest of the interaction rerouting the connector is
1089                 // handled by the context root handler.
1090                 consumed = TRUE;
1091             }
1092             break;
1093         default:
1094             break;
1095     }
1096
1097     return consumed;
1098 }
1099
1100
1101 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item)
1102 {
1103     g_assert(item != NULL );
1104
1105     cc->active_shape = item;
1106
1107     // Remove existing active shape listeners
1108     if (cc->active_shape_repr) {
1109         sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
1110         Inkscape::GC::release(cc->active_shape_repr);
1111
1112         sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
1113         Inkscape::GC::release(cc->active_shape_layer_repr);
1114     }
1115
1116     // Listen in case the active shape changes
1117     cc->active_shape_repr = SP_OBJECT_REPR(item);
1118     if (cc->active_shape_repr) {
1119         Inkscape::GC::anchor(cc->active_shape_repr);
1120         sp_repr_add_listener(cc->active_shape_repr, &shape_repr_events, cc);
1121
1122         cc->active_shape_layer_repr = cc->active_shape_repr->parent();
1123         Inkscape::GC::anchor(cc->active_shape_layer_repr);
1124         sp_repr_add_listener(cc->active_shape_layer_repr, &layer_repr_events, cc);
1125     }
1126
1127
1128     // Set center connection point.
1129     if ( cc->connpthandle == NULL ) {
1130         SPKnot *knot = sp_knot_new(cc->desktop,
1131                 _("<b>Connection point</b>: click or drag to create a new connector"));
1132
1133         knot->setShape(SP_KNOT_SHAPE_SQUARE);
1134         knot->setSize(8);
1135         knot->setAnchor(GTK_ANCHOR_CENTER);
1136         knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1137         sp_knot_update_ctrl(knot);
1138
1139         // We don't want to use the standard knot handler,
1140         //since we don't want this knot to be draggable.
1141         g_signal_handler_disconnect(G_OBJECT(knot->item),
1142                 knot->_event_handler_id);
1143         knot->_event_handler_id = 0;
1144
1145         gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1146                 GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1147
1148         cc->connpthandle = knot;
1149     }
1150
1151
1152     boost::optional<Geom::Rect> bbox = sp_item_bbox_desktop(cc->active_shape);
1153     if (bbox) {
1154         Geom::Point center = bbox->midpoint();
1155         sp_knot_set_position(cc->connpthandle, center, 0);
1156         sp_knot_show(cc->connpthandle);
1157     } else {
1158         sp_knot_hide(cc->connpthandle);
1159     }
1160 }
1161
1162
1163 static void
1164 cc_set_active_conn(SPConnectorContext *cc, SPItem *item)
1165 {
1166     g_assert( SP_IS_PATH(item) );
1167
1168     SPCurve *curve = SP_SHAPE(SP_PATH(item))->curve;
1169     Geom::Matrix i2d = sp_item_i2d_affine(item);
1170
1171     if (cc->active_conn == item)
1172     {
1173         // Just adjust handle positions.
1174         Geom::Point startpt = *(curve->first_point()) * i2d;
1175         sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1176
1177         Geom::Point endpt = *(curve->last_point()) * i2d;
1178         sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1179
1180         return;
1181     }
1182
1183     cc->active_conn = item;
1184
1185     // Remove existing active conn listeners
1186     if (cc->active_conn_repr) {
1187         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
1188         Inkscape::GC::release(cc->active_conn_repr);
1189         cc->active_conn_repr = NULL;
1190     }
1191
1192     // Listen in case the active conn changes
1193     cc->active_conn_repr = SP_OBJECT_REPR(item);
1194     if (cc->active_conn_repr) {
1195         Inkscape::GC::anchor(cc->active_conn_repr);
1196         sp_repr_add_listener(cc->active_conn_repr, &shape_repr_events, cc);
1197     }
1198
1199     for (int i = 0; i < 2; ++i) {
1200
1201         // Create the handle if it doesn't exist
1202         if ( cc->endpt_handle[i] == NULL ) {
1203             SPKnot *knot = sp_knot_new(cc->desktop,
1204                     _("<b>Connector endpoint</b>: drag to reroute or connect to new shapes"));
1205
1206             knot->setShape(SP_KNOT_SHAPE_SQUARE);
1207             knot->setSize(7);
1208             knot->setAnchor(GTK_ANCHOR_CENTER);
1209             knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1210             knot->setStroke(0x000000ff, 0x000000ff, 0x000000ff);
1211             sp_knot_update_ctrl(knot);
1212
1213             // We don't want to use the standard knot handler,
1214             //since we don't want this knot to be draggable.
1215             g_signal_handler_disconnect(G_OBJECT(knot->item),
1216                     knot->_event_handler_id);
1217             knot->_event_handler_id = 0;
1218
1219             gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1220                     GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1221
1222             cc->endpt_handle[i] = knot;
1223         }
1224
1225         // Remove any existing handlers
1226         if (cc->endpt_handler_id[i]) {
1227             g_signal_handlers_disconnect_by_func(
1228                     G_OBJECT(cc->endpt_handle[i]->item),
1229                     (void*)G_CALLBACK(endpt_handler), (gpointer) cc );
1230             cc->endpt_handler_id[i] = 0;
1231         }
1232
1233         // Setup handlers for connector endpoints, this is
1234         // is as 'after' so that cc_generic_knot_handler is
1235         // triggered first for any endpoint.
1236         cc->endpt_handler_id[i] = g_signal_connect_after(
1237                 G_OBJECT(cc->endpt_handle[i]->item), "event",
1238                 G_CALLBACK(endpt_handler), cc);
1239     }
1240
1241     Geom::Point startpt = *(curve->first_point()) * i2d;
1242     sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1243
1244     Geom::Point endpt = *(curve->last_point()) * i2d;
1245     sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1246
1247     sp_knot_show(cc->endpt_handle[0]);
1248     sp_knot_show(cc->endpt_handle[1]);
1249 }
1250
1251
1252 static bool cc_item_is_shape(SPItem *item)
1253 {
1254     if (SP_IS_PATH(item)) {
1255         SPCurve *curve = (SP_SHAPE(item))->curve;
1256         if ( curve && !(curve->is_closed()) ) {
1257             // Open paths are connectors.
1258             return false;
1259         }
1260     }
1261     else if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
1262         Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1263         if (prefs->getBool("/tools/connector/ignoretext", true)) {
1264             // Don't count text as a shape we can connect connector to.
1265             return false;
1266         }
1267     }
1268     return true;
1269 }
1270
1271
1272 bool cc_item_is_connector(SPItem *item)
1273 {
1274     if (SP_IS_PATH(item)) {
1275         if (SP_PATH(item)->connEndPair.isAutoRoutingConn()) {
1276             g_assert( !(SP_SHAPE(item)->curve->is_closed()) );
1277             return true;
1278         }
1279     }
1280     return false;
1281 }
1282
1283
1284 void cc_selection_set_avoid(bool const set_avoid)
1285 {
1286     SPDesktop *desktop = inkscape_active_desktop();
1287     if (desktop == NULL) {
1288         return;
1289     }
1290
1291     SPDocument *document = sp_desktop_document(desktop);
1292
1293     Inkscape::Selection *selection = sp_desktop_selection(desktop);
1294
1295     GSList *l = (GSList *) selection->itemList();
1296
1297     int changes = 0;
1298
1299     while (l) {
1300         SPItem *item = (SPItem *) l->data;
1301
1302         char const *value = (set_avoid) ? "true" : NULL;
1303
1304         if (cc_item_is_shape(item)) {
1305             sp_object_setAttribute(item, "inkscape:connector-avoid",
1306                     value, false);
1307             item->avoidRef->handleSettingChange();
1308             changes++;
1309         }
1310
1311         l = l->next;
1312     }
1313
1314     if (changes == 0) {
1315         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE,
1316                 _("Select <b>at least one non-connector object</b>."));
1317         return;
1318     }
1319
1320     char *event_desc = (set_avoid) ?
1321             _("Make connectors avoid selected objects") :
1322             _("Make connectors ignore selected objects");
1323     sp_document_done(document, SP_VERB_CONTEXT_CONNECTOR, event_desc);
1324 }
1325
1326
1327 static void
1328 cc_selection_changed(Inkscape::Selection *selection, gpointer data)
1329 {
1330     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1331     //SPEventContext *ec = SP_EVENT_CONTEXT(cc);
1332
1333     SPItem *item = selection->singleItem();
1334
1335     if (cc->active_conn == item)
1336     {
1337         // Nothing to change.
1338         return;
1339     }
1340     if (item == NULL)
1341     {
1342         cc_clear_active_conn(cc);
1343         return;
1344     }
1345
1346     if (cc_item_is_connector(item)) {
1347         cc_set_active_conn(cc, item);
1348     }
1349 }
1350
1351
1352 static void
1353 shape_event_attr_deleted(Inkscape::XML::Node */*repr*/, Inkscape::XML::Node *child,
1354                          Inkscape::XML::Node */*ref*/, gpointer data)
1355 {
1356     g_assert(data);
1357     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1358
1359     if (child == cc->active_shape_repr) {
1360         // The active shape has been deleted.  Clear active shape.
1361         cc_clear_active_shape(cc);
1362     }
1363 }
1364
1365
1366 static void
1367 shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
1368                          gchar const */*old_value*/, gchar const */*new_value*/,
1369                          bool /*is_interactive*/, gpointer data)
1370 {
1371     g_assert(data);
1372     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1373
1374     // Look for changes than result in onscreen movement.
1375     if (!strcmp(name, "d") || !strcmp(name, "x") || !strcmp(name, "y") ||
1376             !strcmp(name, "width") || !strcmp(name, "height") ||
1377             !strcmp(name, "transform"))
1378     {
1379         if (repr == cc->active_shape_repr) {
1380             // Active shape has moved. Clear active shape.
1381             cc_clear_active_shape(cc);
1382         }
1383         else if (repr == cc->active_conn_repr) {
1384             // The active conn has been moved.
1385             // Set it again, which just sets new handle positions.
1386             cc_set_active_conn(cc, cc->active_conn);
1387         }
1388     }
1389 }
1390
1391
1392 /*
1393   Local Variables:
1394   mode:c++
1395   c-file-style:"stroustrup"
1396   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1397   indent-tabs-mode:nil
1398   fill-column:99
1399   End:
1400 */
1401 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :