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     sp_canvas_set_snap_delay_active(dt->canvas, true);
 296 }
 297
 298
 299 static void
 300 sp_connector_context_finish(SPEventContext *ec)
 301 {
 302     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 303
 304     spcc_connector_finish(cc);
 305
 306     if (((SPEventContextClass *) parent_class)->finish) {
 307         ((SPEventContextClass *) parent_class)->finish(ec);
 308     }
 309
 310     if (cc->selection) {
 311         cc->selection = NULL;
 312     }
 313     cc_clear_active_shape(cc);
 314     cc_clear_active_conn(cc);
 315
 316     // Restore the default event generating behaviour.
 317     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(ec);
 318     desktop->canvas->gen_all_enter_events = false;
 319
 320     sp_canvas_set_snap_delay_active(desktop->canvas, false);
 321 }
 322
 323
 324 //-----------------------------------------------------------------------------
 325
 326
 327 static void
 328 cc_clear_active_shape(SPConnectorContext *cc)
 329 {
 330     if (cc->active_shape == NULL) {
 331         return;
 332     }
 333     g_assert( cc->active_shape_repr );
 334     g_assert( cc->active_shape_layer_repr );
 335
 336     cc->active_shape = NULL;
 337
 338     if (cc->active_shape_repr) {
 339         sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
 340         Inkscape::GC::release(cc->active_shape_repr);
 341         cc->active_shape_repr = NULL;
 342
 343         sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
 344         Inkscape::GC::release(cc->active_shape_layer_repr);
 345         cc->active_shape_layer_repr = NULL;
 346     }
 347
 348     // Hide the center connection point if it exists.
 349     if (cc->connpthandle) {
 350         sp_knot_hide(cc->connpthandle);
 351     }
 352 }
 353
 354
 355 static void
 356 cc_clear_active_conn(SPConnectorContext *cc)
 357 {
 358     if (cc->active_conn == NULL) {
 359         return;
 360     }
 361     g_assert( cc->active_conn_repr );
 362
 363     cc->active_conn = NULL;
 364
 365     if (cc->active_conn_repr) {
 366         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
 367         Inkscape::GC::release(cc->active_conn_repr);
 368         cc->active_conn_repr = NULL;
 369     }
 370
 371     // Hide the endpoint handles.
 372     for (int i = 0; i < 2; ++i) {
 373         if (cc->endpt_handle[i]) {
 374             sp_knot_hide(cc->endpt_handle[i]);
 375         }
 376     }
 377 }
 378
 379
 380 static gchar *
 381 conn_pt_handle_test(SPConnectorContext *cc, Geom::Point& p)
 382 {
 383     // TODO: this will need to change when there are more connection
 384     //       points available for each shape.
 385
 386     SPKnot *centerpt = cc->connpthandle;
 387     if (cc->active_handle && (cc->active_handle == centerpt))
 388     {
 389         p = centerpt->pos;
 390         return g_strdup_printf("#%s", SP_OBJECT_ID(cc->active_shape));
 391     }
 392     return NULL;
 393 }
 394
 395
 396
 397 static gint
 398 sp_connector_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 399 {
 400     gint ret = FALSE;
 401
 402     SPDesktop *desktop = event_context->desktop;
 403
 404     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(event_context);
 405
 406     Geom::Point p(event->button.x, event->button.y);
 407
 408     switch (event->type) {
 409         case GDK_BUTTON_RELEASE:
 410             if (event->button.button == 1 && !event_context->space_panning) {
 411                 if ((cc->state == SP_CONNECTOR_CONTEXT_DRAGGING) &&
 412                         (connector_within_tolerance))
 413                 {
 414                     spcc_reset_colors(cc);
 415                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 416                 }
 417                 if (cc->state != SP_CONNECTOR_CONTEXT_IDLE) {
 418                     // Doing simething else like rerouting.
 419                     break;
 420                 }
 421                 // find out clicked item, disregarding groups, honoring Alt
 422                 SPItem *item_ungrouped = sp_event_context_find_item(desktop,
 423                         p, event->button.state & GDK_MOD1_MASK, TRUE);
 424
 425                 if (event->button.state & GDK_SHIFT_MASK) {
 426                     cc->selection->toggle(item_ungrouped);
 427                 } else {
 428                     cc->selection->set(item_ungrouped);
 429                 }
 430                 ret = TRUE;
 431             }
 432             break;
 433         case GDK_ENTER_NOTIFY:
 434         {
 435             if (cc_item_is_shape(item)) {
 436                 // This is a shape, so show connection point(s).
 437                 if (!(cc->active_shape) ||
 438                         // Don't show handle for another handle.
 439                         (item != ((SPItem *) cc->connpthandle))) {
 440                     cc_set_active_shape(cc, item);
 441                 }
 442             }
 443             ret = TRUE;
 444             break;
 445         }
 446         default:
 447             break;
 448     }
 449
 450     return ret;
 451 }
 452
 453
 454 gint
 455 sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event)
 456 {
 457     SPConnectorContext *const cc = SP_CONNECTOR_CONTEXT(ec);
 458
 459     gint ret = FALSE;
 460
 461     switch (event->type) {
 462         case GDK_BUTTON_PRESS:
 463             ret = connector_handle_button_press(cc, event->button);
 464             break;
 465
 466         case GDK_MOTION_NOTIFY:
 467             ret = connector_handle_motion_notify(cc, event->motion);
 468             break;
 469
 470         case GDK_BUTTON_RELEASE:
 471             ret = connector_handle_button_release(cc, event->button);
 472             break;
 473         case GDK_KEY_PRESS:
 474             ret = connector_handle_key_press(cc, get_group0_keyval (&event->key));
 475             break;
 476
 477         default:
 478             break;
 479     }
 480
 481     if (!ret) {
 482         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 483             = ((SPEventContextClass *) parent_class)->root_handler;
 484         if (parent_root_handler) {
 485             ret = parent_root_handler(ec, event);
 486         }
 487     }
 488
 489     return ret;
 490 }
 491
 492
 493 static gint
 494 connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent)
 495 {
 496     Geom::Point const event_w(bevent.x, bevent.y);
 497     /* Find desktop coordinates */
 498     Geom::Point p = cc->desktop->w2d(event_w);
 499     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 500
 501     gint ret = FALSE;
 502     if ( bevent.button == 1 && !event_context->space_panning ) {
 503
 504         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 505
 506         if (Inkscape::have_viable_layer(desktop, cc->_message_context) == false) {
 507             return TRUE;
 508         }
 509
 510         Geom::Point const event_w(bevent.x,
 511                                 bevent.y);
 512         connector_drag_origin_w = event_w;
 513         connector_within_tolerance = true;
 514
 515         Geom::Point const event_dt = cc->desktop->w2d(event_w);
 516         switch (cc->state) {
 517             case SP_CONNECTOR_CONTEXT_STOP:
 518                 /* This is allowed, if we just cancelled curve */
 519             case SP_CONNECTOR_CONTEXT_IDLE:
 520             {
 521                 if ( cc->npoints == 0 ) {
 522                     cc_clear_active_conn(cc);
 523
 524                     SP_EVENT_CONTEXT_DESKTOP(cc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new connector"));
 525
 526                     /* Set start anchor */
 527                     /* Create green anchor */
 528                     Geom::Point p = event_dt;
 529
 530                     // Test whether we clicked on a connection point
 531                     cc->sid = conn_pt_handle_test(cc, p);
 532
 533                     Geom::Point pt2g = to_2geom(p);
 534
 535                     if (!cc->sid) {
 536                         // This is the first point, so just snap it to the grid
 537                         // as there's no other points to go off.
 538                         SnapManager &m = cc->desktop->namedview->snap_manager;
 539                         m.setup(cc->desktop);
 540                         m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, pt2g, Inkscape::SNAPSOURCE_HANDLE);
 541                     }
 542                     spcc_connector_set_initial_point(cc, from_2geom(pt2g));
 543
 544                 }
 545                 cc->state = SP_CONNECTOR_CONTEXT_DRAGGING;
 546                 ret = TRUE;
 547                 break;
 548             }
 549             case SP_CONNECTOR_CONTEXT_DRAGGING:
 550             {
 551                 // This is the second click of a connector creation.
 552
 553                 spcc_connector_set_subsequent_point(cc, p);
 554                 spcc_connector_finish_segment(cc, p);
 555                 // Test whether we clicked on a connection point
 556                 cc->eid = conn_pt_handle_test(cc, p);
 557                 if (cc->npoints != 0) {
 558                     spcc_connector_finish(cc);
 559                 }
 560                 cc_set_active_conn(cc, cc->newconn);
 561                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 562                 ret = TRUE;
 563                 break;
 564             }
 565             case SP_CONNECTOR_CONTEXT_CLOSE:
 566             {
 567                 g_warning("Button down in CLOSE state");
 568                 break;
 569             }
 570             default:
 571                 break;
 572         }
 573     } else if (bevent.button == 3) {
 574         if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
 575             // A context menu is going to be triggered here,
 576             // so end the rerouting operation.
 577             cc_connector_rerouting_finish(cc, &p);
 578
 579             cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 580
 581             // Don't set ret to TRUE, so we drop through to the
 582             // parent handler which will open the context menu.
 583         }
 584         else if (cc->npoints != 0) {
 585             spcc_connector_finish(cc);
 586             ret = TRUE;
 587         }
 588     }
 589     return ret;
 590 }
 591
 592
 593 static gint
 594 connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent)
 595 {
 596     gint ret = FALSE;
 597     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 598     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 599
 600     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 601         // allow middle-button scrolling
 602         return FALSE;
 603     }
 604
 605     Geom::Point const event_w(mevent.x, mevent.y);
 606
 607     if (connector_within_tolerance) {
 608         gint const tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 609         if ( Geom::LInfty( event_w - connector_drag_origin_w ) < tolerance ) {
 610             return FALSE;   // Do not drag if we're within tolerance from origin.
 611         }
 612     }
 613     // Once the user has moved farther than tolerance from the original location
 614     // (indicating they intend to move the object, not click), then always process
 615     // the motion notify coordinates as given (no snapping back to origin)
 616     connector_within_tolerance = false;
 617
 618     SPDesktop *const dt = cc->desktop;
 619
 620     /* Find desktop coordinates */
 621     Geom::Point p = dt->w2d(event_w);
 622
 623     switch (cc->state) {
 624         case SP_CONNECTOR_CONTEXT_DRAGGING:
 625         {
 626             // This is movement during a connector creation.
 627
 628             if ( cc->npoints > 0 ) {
 629                 cc->selection->clear();
 630                 spcc_connector_set_subsequent_point(cc, p);
 631                 ret = TRUE;
 632             }
 633             break;
 634         }
 635         case SP_CONNECTOR_CONTEXT_REROUTING:
 636         {
 637             g_assert( SP_IS_PATH(cc->clickeditem));
 638
 639             // Update the hidden path
 640             Geom::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
 641             Geom::Matrix d2i = i2d.inverse();
 642             SPPath *path = SP_PATH(cc->clickeditem);
 643             SPCurve *curve = (SP_SHAPE(path))->curve;
 644             if (cc->clickedhandle == cc->endpt_handle[0]) {
 645                 Geom::Point o = cc->endpt_handle[1]->pos;
 646                 curve->stretch_endpoints(p * d2i, o * d2i);
 647             }
 648             else {
 649                 Geom::Point o = cc->endpt_handle[0]->pos;
 650                 curve->stretch_endpoints(o * d2i, p * d2i);
 651             }
 652             sp_conn_adjust_path(path);
 653
 654             // Copy this to the temporary visible path
 655             cc->red_curve = SP_SHAPE(path)->curve->copy();
 656             cc->red_curve->transform(i2d);
 657
 658             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 659             ret = TRUE;
 660             break;
 661         }
 662         case SP_CONNECTOR_CONTEXT_STOP:
 663             /* This is perfectly valid */
 664             break;
 665         default:
 666             break;
 667     }
 668
 669     return ret;
 670 }
 671
 672
 673 static gint
 674 connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent)
 675 {
 676     gint ret = FALSE;
 677     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 678     if ( revent.button == 1 && !event_context->space_panning ) {
 679
 680         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 681         SPDocument *doc = sp_desktop_document(desktop);
 682
 683         Geom::Point const event_w(revent.x, revent.y);
 684
 685         /* Find desktop coordinates */
 686         Geom::Point p = cc->desktop->w2d(event_w);
 687
 688         switch (cc->state) {
 689             //case SP_CONNECTOR_CONTEXT_POINT:
 690             case SP_CONNECTOR_CONTEXT_DRAGGING:
 691             {
 692                 if (connector_within_tolerance)
 693                 {
 694                     spcc_connector_finish_segment(cc, p);
 695                     return TRUE;
 696                 }
 697                 // Connector has been created via a drag, end it now.
 698                 spcc_connector_set_subsequent_point(cc, p);
 699                 spcc_connector_finish_segment(cc, p);
 700                 // Test whether we clicked on a connection point
 701                 cc->eid = conn_pt_handle_test(cc, p);
 702                 if (cc->npoints != 0) {
 703                     spcc_connector_finish(cc);
 704                 }
 705                 cc_set_active_conn(cc, cc->newconn);
 706                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 707                 break;
 708             }
 709             case SP_CONNECTOR_CONTEXT_REROUTING:
 710             {
 711                 cc_connector_rerouting_finish(cc, &p);
 712
 713                 sp_document_ensure_up_to_date(doc);
 714                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 715                 return TRUE;
 716                 break;
 717             }
 718             case SP_CONNECTOR_CONTEXT_STOP:
 719                 /* This is allowed, if we just cancelled curve */
 720                 break;
 721             default:
 722                 break;
 723         }
 724         ret = TRUE;
 725     }
 726
 727     return ret;
 728 }
 729
 730
 731 static gint
 732 connector_handle_key_press(SPConnectorContext *const cc, guint const keyval)
 733 {
 734     gint ret = FALSE;
 735     /* fixme: */
 736     switch (keyval) {
 737         case GDK_Return:
 738         case GDK_KP_Enter:
 739             if (cc->npoints != 0) {
 740                 spcc_connector_finish(cc);
 741                 ret = TRUE;
 742             }
 743             break;
 744         case GDK_Escape:
 745             if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
 746
 747                 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 748                 SPDocument *doc = sp_desktop_document(desktop);
 749
 750                 cc_connector_rerouting_finish(cc, NULL);
 751
 752                 sp_document_undo(doc);
 753
 754                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 755                 desktop->messageStack()->flash( Inkscape::NORMAL_MESSAGE,
 756                         _("Connector endpoint drag cancelled."));
 757                 ret = TRUE;
 758             }
 759             else if (cc->npoints != 0) {
 760                 // if drawing, cancel, otherwise pass it up for deselecting
 761                 cc->state = SP_CONNECTOR_CONTEXT_STOP;
 762                 spcc_reset_colors(cc);
 763                 ret = TRUE;
 764             }
 765             break;
 766         default:
 767             break;
 768     }
 769     return ret;
 770 }
 771
 772
 773 static void
 774 cc_connector_rerouting_finish(SPConnectorContext *const cc, Geom::Point *const p)
 775 {
 776     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 777     SPDocument *doc = sp_desktop_document(desktop);
 778
 779     // Clear the temporary path:
 780     cc->red_curve->reset();
 781     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 782
 783     if (p != NULL)
 784     {
 785         // Test whether we clicked on a connection point
 786         gchar *shape_label = conn_pt_handle_test(cc, *p);
 787
 788         if (shape_label) {
 789             if (cc->clickedhandle == cc->endpt_handle[0]) {
 790                 sp_object_setAttribute(cc->clickeditem,
 791                         "inkscape:connection-start",shape_label, false);
 792             }
 793             else {
 794                 sp_object_setAttribute(cc->clickeditem,
 795                         "inkscape:connection-end",shape_label, false);
 796             }
 797             g_free(shape_label);
 798         }
 799     }
 800     cc->clickeditem->setHidden(false);
 801     sp_conn_adjust_path(SP_PATH(cc->clickeditem));
 802     cc->clickeditem->updateRepr();
 803     sp_document_done(doc, SP_VERB_CONTEXT_CONNECTOR,
 804                      _("Reroute connector"));
 805     cc_set_active_conn(cc, cc->clickeditem);
 806 }
 807
 808
 809 static void
 810 spcc_reset_colors(SPConnectorContext *cc)
 811 {
 812     /* Red */
 813     cc->red_curve->reset();
 814     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 815
 816     cc->green_curve->reset();
 817     cc->npoints = 0;
 818 }
 819
 820
 821 static void
 822 spcc_connector_set_initial_point(SPConnectorContext *const cc, Geom::Point const p)
 823 {
 824     g_assert( cc->npoints == 0 );
 825
 826     cc->p[0] = p;
 827     cc->p[1] = p;
 828     cc->npoints = 2;
 829     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 830 }
 831
 832
 833 static void
 834 spcc_connector_set_subsequent_point(SPConnectorContext *const cc, Geom::Point const p)
 835 {
 836     g_assert( cc->npoints != 0 );
 837
 838     SPDesktop *dt = cc->desktop;
 839     Geom::Point o = dt->dt2doc(cc->p[0]);
 840     Geom::Point d = dt->dt2doc(p);
 841     Avoid::Point src(o[Geom::X], o[Geom::Y]);
 842     Avoid::Point dst(d[Geom::X], d[Geom::Y]);
 843
 844     if (!cc->newConnRef) {
 845         Avoid::Router *router = sp_desktop_document(dt)->router;
 846         cc->newConnRef = new Avoid::ConnRef(router, 0, src, dst);
 847         cc->newConnRef->updateEndPoint(Avoid::VertID::src, src);
 848     }
 849     cc->newConnRef->updateEndPoint(Avoid::VertID::tar, dst);
 850
 851     cc->newConnRef->makePathInvalid();
 852     cc->newConnRef->generatePath(src, dst);
 853
 854     Avoid::PolyLine route = cc->newConnRef->route();
 855     cc->newConnRef->calcRouteDist();
 856
 857     cc->red_curve->reset();
 858     Geom::Point pt(route.ps[0].x, route.ps[0].y);
 859     cc->red_curve->moveto(pt);
 860
 861     for (int i = 1; i < route.pn; ++i) {
 862         Geom::Point p(route.ps[i].x, route.ps[i].y);
 863         cc->red_curve->lineto(p);
 864     }
 865     cc->red_curve->transform(dt->doc2dt());
 866     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 867 }
 868
 869
 870 /**
 871  * Concats red, blue and green.
 872  * If any anchors are defined, process these, optionally removing curves from white list
 873  * Invoke _flush_white to write result back to object.
 874  */
 875 static void
 876 spcc_concat_colors_and_flush(SPConnectorContext *cc)
 877 {
 878     SPCurve *c = cc->green_curve;
 879     cc->green_curve = new SPCurve();
 880
 881     cc->red_curve->reset();
 882     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 883
 884     if (c->is_empty()) {
 885         c->unref();
 886         return;
 887     }
 888
 889     spcc_flush_white(cc, c);
 890
 891     c->unref();
 892 }
 893
 894
 895 /*
 896  * Flushes white curve(s) and additional curve into object
 897  *
 898  * No cleaning of colored curves - this has to be done by caller
 899  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
 900  *
 901  */
 902
 903 static void
 904 spcc_flush_white(SPConnectorContext *cc, SPCurve *gc)
 905 {
 906     SPCurve *c;
 907
 908     if (gc) {
 909         c = gc;
 910         c->ref();
 911     } else {
 912         return;
 913     }
 914
 915     /* Now we have to go back to item coordinates at last */
 916     c->transform(sp_desktop_dt2doc_affine(SP_EVENT_CONTEXT_DESKTOP(cc)));
 917
 918     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 919     SPDocument *doc = sp_desktop_document(desktop);
 920     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
 921
 922     if ( c && !c->is_empty() ) {
 923         /* We actually have something to write */
 924
 925         Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 926         /* Set style */
 927         sp_desktop_apply_style_tool(desktop, repr, "/tools/connector", false);
 928
 929         gchar *str = sp_svg_write_path( c->get_pathvector() );
 930         g_assert( str != NULL );
 931         repr->setAttribute("d", str);
 932         g_free(str);
 933
 934         /* Attach repr */
 935         cc->newconn = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 936         cc->selection->set(repr);
 937         Inkscape::GC::release(repr);
 938         cc->newconn->transform = sp_item_i2doc_affine(SP_ITEM(desktop->currentLayer())).inverse();
 939         cc->newconn->updateRepr();
 940
 941         bool connection = false;
 942         sp_object_setAttribute(cc->newconn, "inkscape:connector-type",
 943                 "polyline", false);
 944         if (cc->sid)
 945         {
 946             sp_object_setAttribute(cc->newconn, "inkscape:connection-start",
 947                     cc->sid, false);
 948             connection = true;
 949         }
 950
 951         if (cc->eid)
 952         {
 953             sp_object_setAttribute(cc->newconn, "inkscape:connection-end",
 954                     cc->eid, false);
 955             connection = true;
 956         }
 957         cc->newconn->updateRepr();
 958         if (connection) {
 959             // Adjust endpoints to shape edge.
 960             sp_conn_adjust_path(SP_PATH(cc->newconn));
 961         }
 962         cc->newconn->updateRepr();
 963     }
 964
 965     c->unref();
 966
 967     /* Flush pending updates */
 968     sp_document_done(doc, SP_VERB_CONTEXT_CONNECTOR, _("Create connector"));
 969     sp_document_ensure_up_to_date(doc);
 970 }
 971
 972
 973 static void
 974 spcc_connector_finish_segment(SPConnectorContext *const cc, Geom::Point const /*p*/)
 975 {
 976     if (!cc->red_curve->is_empty()) {
 977         cc->green_curve->append_continuous(cc->red_curve, 0.0625);
 978
 979         cc->p[0] = cc->p[3];
 980         cc->p[1] = cc->p[4];
 981         cc->npoints = 2;
 982
 983         cc->red_curve->reset();
 984     }
 985 }
 986
 987
 988 static void
 989 spcc_connector_finish(SPConnectorContext *const cc)
 990 {
 991     SPDesktop *const desktop = cc->desktop;
 992     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Finishing connector"));
 993
 994     cc->red_curve->reset();
 995     spcc_concat_colors_and_flush(cc);
 996
 997     cc->npoints = 0;
 998
 999     if (cc->newConnRef) {
1000         cc->newConnRef->removeFromGraph();
1001         delete cc->newConnRef;
1002         cc->newConnRef = NULL;
1003     }
1004     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1005 }
1006
1007
1008 static gboolean
1009 cc_generic_knot_handler(SPCanvasItem *, GdkEvent *event, SPKnot *knot)
1010 {
1011     g_assert (knot != NULL);
1012
1013     g_object_ref(knot);
1014
1015     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(
1016             knot->desktop->event_context);
1017
1018     gboolean consumed = FALSE;
1019
1020     switch (event->type) {
1021         case GDK_ENTER_NOTIFY:
1022             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, TRUE);
1023
1024             cc->active_handle = knot;
1025
1026             if (knot->tip)
1027             {
1028                 knot->desktop->event_context->defaultMessageContext()->set(
1029                         Inkscape::NORMAL_MESSAGE, knot->tip);
1030             }
1031
1032             consumed = TRUE;
1033             break;
1034         case GDK_LEAVE_NOTIFY:
1035             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, FALSE);
1036
1037             cc->active_handle = NULL;
1038
1039             if (knot->tip) {
1040                 knot->desktop->event_context->defaultMessageContext()->clear();
1041             }
1042
1043             consumed = TRUE;
1044             break;
1045         default:
1046             break;
1047     }
1048
1049     g_object_unref(knot);
1050
1051     return consumed;
1052 }
1053
1054
1055 static gboolean
1056 endpt_handler(SPKnot */*knot*/, GdkEvent *event, SPConnectorContext *cc)
1057 {
1058     g_assert( SP_IS_CONNECTOR_CONTEXT(cc) );
1059
1060     gboolean consumed = FALSE;
1061
1062     switch (event->type) {
1063         case GDK_BUTTON_PRESS:
1064             g_assert( (cc->active_handle == cc->endpt_handle[0]) ||
1065                       (cc->active_handle == cc->endpt_handle[1]) );
1066             if (cc->state == SP_CONNECTOR_CONTEXT_IDLE) {
1067                 cc->clickeditem = cc->active_conn;
1068                 cc->clickedhandle = cc->active_handle;
1069                 cc_clear_active_conn(cc);
1070                 cc->state = SP_CONNECTOR_CONTEXT_REROUTING;
1071
1072                 // Disconnect from attached shape
1073                 unsigned ind = (cc->active_handle == cc->endpt_handle[0]) ? 0 : 1;
1074                 sp_conn_end_detach(cc->clickeditem, ind);
1075
1076                 Geom::Point origin;
1077                 if (cc->clickedhandle == cc->endpt_handle[0]) {
1078                     origin = cc->endpt_handle[1]->pos;
1079                 }
1080                 else {
1081                     origin = cc->endpt_handle[0]->pos;
1082                 }
1083
1084                 // Show the red path for dragging.
1085                 cc->red_curve = SP_PATH(cc->clickeditem)->curve->copy();
1086                 Geom::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
1087                 cc->red_curve->transform(i2d);
1088                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
1089
1090                 cc->clickeditem->setHidden(true);
1091
1092                 // The rest of the interaction rerouting the connector is
1093                 // handled by the context root handler.
1094                 consumed = TRUE;
1095             }
1096             break;
1097         default:
1098             break;
1099     }
1100
1101     return consumed;
1102 }
1103
1104
1105 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item)
1106 {
1107     g_assert(item != NULL );
1108
1109     cc->active_shape = item;
1110
1111     // Remove existing active shape listeners
1112     if (cc->active_shape_repr) {
1113         sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
1114         Inkscape::GC::release(cc->active_shape_repr);
1115
1116         sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
1117         Inkscape::GC::release(cc->active_shape_layer_repr);
1118     }
1119
1120     // Listen in case the active shape changes
1121     cc->active_shape_repr = SP_OBJECT_REPR(item);
1122     if (cc->active_shape_repr) {
1123         Inkscape::GC::anchor(cc->active_shape_repr);
1124         sp_repr_add_listener(cc->active_shape_repr, &shape_repr_events, cc);
1125
1126         cc->active_shape_layer_repr = cc->active_shape_repr->parent();
1127         Inkscape::GC::anchor(cc->active_shape_layer_repr);
1128         sp_repr_add_listener(cc->active_shape_layer_repr, &layer_repr_events, cc);
1129     }
1130
1131
1132     // Set center connection point.
1133     if ( cc->connpthandle == NULL ) {
1134         SPKnot *knot = sp_knot_new(cc->desktop,
1135                 _("<b>Connection point</b>: click or drag to create a new connector"));
1136
1137         knot->setShape(SP_KNOT_SHAPE_SQUARE);
1138         knot->setSize(8);
1139         knot->setAnchor(GTK_ANCHOR_CENTER);
1140         knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1141         sp_knot_update_ctrl(knot);
1142
1143         // We don't want to use the standard knot handler,
1144         //since we don't want this knot to be draggable.
1145         g_signal_handler_disconnect(G_OBJECT(knot->item),
1146                 knot->_event_handler_id);
1147         knot->_event_handler_id = 0;
1148
1149         gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1150                 GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1151
1152         cc->connpthandle = knot;
1153     }
1154
1155
1156     Geom::OptRect bbox = sp_item_bbox_desktop(cc->active_shape);
1157     if (bbox) {
1158         Geom::Point center = bbox->midpoint();
1159         sp_knot_set_position(cc->connpthandle, center, 0);
1160         sp_knot_show(cc->connpthandle);
1161     } else {
1162         sp_knot_hide(cc->connpthandle);
1163     }
1164 }
1165
1166
1167 static void
1168 cc_set_active_conn(SPConnectorContext *cc, SPItem *item)
1169 {
1170     g_assert( SP_IS_PATH(item) );
1171
1172     SPCurve *curve = SP_SHAPE(SP_PATH(item))->curve;
1173     Geom::Matrix i2d = sp_item_i2d_affine(item);
1174
1175     if (cc->active_conn == item)
1176     {
1177         // Just adjust handle positions.
1178         Geom::Point startpt = *(curve->first_point()) * i2d;
1179         sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1180
1181         Geom::Point endpt = *(curve->last_point()) * i2d;
1182         sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1183
1184         return;
1185     }
1186
1187     cc->active_conn = item;
1188
1189     // Remove existing active conn listeners
1190     if (cc->active_conn_repr) {
1191         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
1192         Inkscape::GC::release(cc->active_conn_repr);
1193         cc->active_conn_repr = NULL;
1194     }
1195
1196     // Listen in case the active conn changes
1197     cc->active_conn_repr = SP_OBJECT_REPR(item);
1198     if (cc->active_conn_repr) {
1199         Inkscape::GC::anchor(cc->active_conn_repr);
1200         sp_repr_add_listener(cc->active_conn_repr, &shape_repr_events, cc);
1201     }
1202
1203     for (int i = 0; i < 2; ++i) {
1204
1205         // Create the handle if it doesn't exist
1206         if ( cc->endpt_handle[i] == NULL ) {
1207             SPKnot *knot = sp_knot_new(cc->desktop,
1208                     _("<b>Connector endpoint</b>: drag to reroute or connect to new shapes"));
1209
1210             knot->setShape(SP_KNOT_SHAPE_SQUARE);
1211             knot->setSize(7);
1212             knot->setAnchor(GTK_ANCHOR_CENTER);
1213             knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1214             knot->setStroke(0x000000ff, 0x000000ff, 0x000000ff);
1215             sp_knot_update_ctrl(knot);
1216
1217             // We don't want to use the standard knot handler,
1218             //since we don't want this knot to be draggable.
1219             g_signal_handler_disconnect(G_OBJECT(knot->item),
1220                     knot->_event_handler_id);
1221             knot->_event_handler_id = 0;
1222
1223             gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1224                     GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1225
1226             cc->endpt_handle[i] = knot;
1227         }
1228
1229         // Remove any existing handlers
1230         if (cc->endpt_handler_id[i]) {
1231             g_signal_handlers_disconnect_by_func(
1232                     G_OBJECT(cc->endpt_handle[i]->item),
1233                     (void*)G_CALLBACK(endpt_handler), (gpointer) cc );
1234             cc->endpt_handler_id[i] = 0;
1235         }
1236
1237         // Setup handlers for connector endpoints, this is
1238         // is as 'after' so that cc_generic_knot_handler is
1239         // triggered first for any endpoint.
1240         cc->endpt_handler_id[i] = g_signal_connect_after(
1241                 G_OBJECT(cc->endpt_handle[i]->item), "event",
1242                 G_CALLBACK(endpt_handler), cc);
1243     }
1244
1245     Geom::Point startpt = *(curve->first_point()) * i2d;
1246     sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1247
1248     Geom::Point endpt = *(curve->last_point()) * i2d;
1249     sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1250
1251     sp_knot_show(cc->endpt_handle[0]);
1252     sp_knot_show(cc->endpt_handle[1]);
1253 }
1254
1255
1256 static bool cc_item_is_shape(SPItem *item)
1257 {
1258     if (SP_IS_PATH(item)) {
1259         SPCurve *curve = (SP_SHAPE(item))->curve;
1260         if ( curve && !(curve->is_closed()) ) {
1261             // Open paths are connectors.
1262             return false;
1263         }
1264     }
1265     else if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
1266         Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1267         if (prefs->getBool("/tools/connector/ignoretext", true)) {
1268             // Don't count text as a shape we can connect connector to.
1269             return false;
1270         }
1271     }
1272     return true;
1273 }
1274
1275
1276 bool cc_item_is_connector(SPItem *item)
1277 {
1278     if (SP_IS_PATH(item)) {
1279         if (SP_PATH(item)->connEndPair.isAutoRoutingConn()) {
1280             g_assert( !(SP_SHAPE(item)->curve->is_closed()) );
1281             return true;
1282         }
1283     }
1284     return false;
1285 }
1286
1287
1288 void cc_selection_set_avoid(bool const set_avoid)
1289 {
1290     SPDesktop *desktop = inkscape_active_desktop();
1291     if (desktop == NULL) {
1292         return;
1293     }
1294
1295     SPDocument *document = sp_desktop_document(desktop);
1296
1297     Inkscape::Selection *selection = sp_desktop_selection(desktop);
1298
1299     GSList *l = (GSList *) selection->itemList();
1300
1301     int changes = 0;
1302
1303     while (l) {
1304         SPItem *item = (SPItem *) l->data;
1305
1306         char const *value = (set_avoid) ? "true" : NULL;
1307
1308         if (cc_item_is_shape(item)) {
1309             sp_object_setAttribute(item, "inkscape:connector-avoid",
1310                     value, false);
1311             item->avoidRef->handleSettingChange();
1312             changes++;
1313         }
1314
1315         l = l->next;
1316     }
1317
1318     if (changes == 0) {
1319         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE,
1320                 _("Select <b>at least one non-connector object</b>."));
1321         return;
1322     }
1323
1324     char *event_desc = (set_avoid) ?
1325             _("Make connectors avoid selected objects") :
1326             _("Make connectors ignore selected objects");
1327     sp_document_done(document, SP_VERB_CONTEXT_CONNECTOR, event_desc);
1328 }
1329
1330
1331 static void
1332 cc_selection_changed(Inkscape::Selection *selection, gpointer data)
1333 {
1334     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1335     //SPEventContext *ec = SP_EVENT_CONTEXT(cc);
1336
1337     SPItem *item = selection->singleItem();
1338
1339     if (cc->active_conn == item)
1340     {
1341         // Nothing to change.
1342         return;
1343     }
1344     if (item == NULL)
1345     {
1346         cc_clear_active_conn(cc);
1347         return;
1348     }
1349
1350     if (cc_item_is_connector(item)) {
1351         cc_set_active_conn(cc, item);
1352     }
1353 }
1354
1355
1356 static void
1357 shape_event_attr_deleted(Inkscape::XML::Node */*repr*/, Inkscape::XML::Node *child,
1358                          Inkscape::XML::Node */*ref*/, gpointer data)
1359 {
1360     g_assert(data);
1361     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1362
1363     if (child == cc->active_shape_repr) {
1364         // The active shape has been deleted.  Clear active shape.
1365         cc_clear_active_shape(cc);
1366     }
1367 }
1368
1369
1370 static void
1371 shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
1372                          gchar const */*old_value*/, gchar const */*new_value*/,
1373                          bool /*is_interactive*/, gpointer data)
1374 {
1375     g_assert(data);
1376     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1377
1378     // Look for changes than result in onscreen movement.
1379     if (!strcmp(name, "d") || !strcmp(name, "x") || !strcmp(name, "y") ||
1380             !strcmp(name, "width") || !strcmp(name, "height") ||
1381             !strcmp(name, "transform"))
1382     {
1383         if (repr == cc->active_shape_repr) {
1384             // Active shape has moved. Clear active shape.
1385             cc_clear_active_shape(cc);
1386         }
1387         else if (repr == cc->active_conn_repr) {
1388             // The active conn has been moved.
1389             // Set it again, which just sets new handle positions.
1390             cc_set_active_conn(cc, cc->active_conn);
1391         }
1392     }
1393 }
1394
1395
1396 /*
1397   Local Variables:
1398   mode:c++
1399   c-file-style:"stroustrup"
1400   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1401   indent-tabs-mode:nil
1402   fill-column:99
1403   End:
1404 */
1405 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :