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
  46 #include "connector-context.h"
  47 #include "pixmaps/cursor-connector.xpm"
  48 #include "xml/node-event-vector.h"
  49 #include "xml/repr.h"
  50 #include "svg/svg.h"
  51 #include "desktop.h"
  52 #include "desktop-style.h"
  53 #include "desktop-affine.h"
  54 #include "desktop-handles.h"
  55 #include "document.h"
  56 #include "message-context.h"
  57 #include "message-stack.h"
  58 #include "selection.h"
  59 #include "inkscape.h"
  60 #include "prefs-utils.h"
  61 #include "sp-path.h"
  62 #include "display/canvas-bpath.h"
  63 #include "display/sodipodi-ctrl.h"
  64 #include <glibmm/i18n.h>
  65 #include "snap.h"
  66 #include "knot.h"
  67 #include "sp-conn-end.h"
  68 #include "conn-avoid-ref.h"
  69 #include "libavoid/vertices.h"
  70 #include "context-fns.h"
  71 #include "sp-namedview.h"
  72 #include "sp-text.h"
  73 #include "sp-flowtext.h"
  74
  75
  76 static void sp_connector_context_class_init(SPConnectorContextClass *klass);
  77 static void sp_connector_context_init(SPConnectorContext *conn_context);
  78 static void sp_connector_context_dispose(GObject *object);
  79
  80 static void sp_connector_context_setup(SPEventContext *ec);
  81 static void sp_connector_context_finish(SPEventContext *ec);
  82 static gint sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event);
  83 static gint sp_connector_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  84
  85 // Stuff borrowed from DrawContext
  86 static void spcc_connector_set_initial_point(SPConnectorContext *cc, NR::Point const p);
  87 static void spcc_connector_set_subsequent_point(SPConnectorContext *cc, NR::Point const p);
  88 static void spcc_connector_finish_segment(SPConnectorContext *cc, NR::Point p);
  89 static void spcc_reset_colors(SPConnectorContext *cc);
  90 static void spcc_connector_finish(SPConnectorContext *cc);
  91 static void spcc_concat_colors_and_flush(SPConnectorContext *cc);
  92 static void spcc_flush_white(SPConnectorContext *cc, SPCurve *gc);
  93
  94 // Context event handlers
  95 static gint connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent);
  96 static gint connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent);
  97 static gint connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent);
  98 static gint connector_handle_key_press(SPConnectorContext *const cc, guint const keyval);
  99
 100 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item);
 101 static void cc_clear_active_shape(SPConnectorContext *cc);
 102 static void cc_set_active_conn(SPConnectorContext *cc, SPItem *item);
 103 static void cc_clear_active_conn(SPConnectorContext *cc);
 104 static gchar *conn_pt_handle_test(SPConnectorContext *cc, NR::Point& w);
 105 static bool cc_item_is_shape(SPItem *item);
 106 static void cc_selection_changed(Inkscape::Selection *selection, gpointer data);
 107 static void cc_connector_rerouting_finish(SPConnectorContext *const cc,
 108         NR::Point *const p);
 109
 110 static void shape_event_attr_deleted(Inkscape::XML::Node *repr,
 111         Inkscape::XML::Node *child, Inkscape::XML::Node *ref, gpointer data);
 112 static void shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
 113         gchar const *old_value, gchar const *new_value, bool is_interactive,
 114         gpointer data);
 115
 116
 117 static NR::Point connector_drag_origin_w(0, 0);
 118 static bool connector_within_tolerance = false;
 119 static SPEventContextClass *parent_class;
 120
 121
 122 static Inkscape::XML::NodeEventVector shape_repr_events = {
 123     NULL, /* child_added */
 124     NULL, /* child_added */
 125     shape_event_attr_changed,
 126     NULL, /* content_changed */
 127     NULL  /* order_changed */
 128 };
 129
 130 static Inkscape::XML::NodeEventVector layer_repr_events = {
 131     NULL, /* child_added */
 132     shape_event_attr_deleted,
 133     NULL, /* child_added */
 134     NULL, /* content_changed */
 135     NULL  /* order_changed */
 136 };
 137
 138
 139 GType
 140 sp_connector_context_get_type(void)
 141 {
 142     static GType type = 0;
 143     if (!type) {
 144         GTypeInfo info = {
 145             sizeof(SPConnectorContextClass),
 146             NULL, NULL,
 147             (GClassInitFunc) sp_connector_context_class_init,
 148             NULL, NULL,
 149             sizeof(SPConnectorContext),
 150             4,
 151             (GInstanceInitFunc) sp_connector_context_init,
 152             NULL,   /* value_table */
 153         };
 154         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPConnectorContext", &info, (GTypeFlags)0);
 155     }
 156     return type;
 157 }
 158
 159 static void
 160 sp_connector_context_class_init(SPConnectorContextClass *klass)
 161 {
 162     GObjectClass *object_class;
 163     SPEventContextClass *event_context_class;
 164
 165     object_class = (GObjectClass *) klass;
 166     event_context_class = (SPEventContextClass *) klass;
 167
 168     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 169
 170     object_class->dispose = sp_connector_context_dispose;
 171
 172     event_context_class->setup = sp_connector_context_setup;
 173     event_context_class->finish = sp_connector_context_finish;
 174     event_context_class->root_handler = sp_connector_context_root_handler;
 175     event_context_class->item_handler = sp_connector_context_item_handler;
 176 }
 177
 178
 179 static void
 180 sp_connector_context_init(SPConnectorContext *cc)
 181 {
 182     SPEventContext *ec = SP_EVENT_CONTEXT(cc);
 183
 184     ec->cursor_shape = cursor_connector_xpm;
 185     ec->hot_x = 1;
 186     ec->hot_y = 1;
 187     ec->xp = 0;
 188     ec->yp = 0;
 189
 190     cc->red_color = 0xff00007f;
 191
 192     cc->newconn = NULL;
 193     cc->newConnRef = NULL;
 194
 195     cc->sel_changed_connection = sigc::connection();
 196
 197     cc->active_shape = NULL;
 198     cc->active_shape_repr = NULL;
 199     cc->active_shape_layer_repr = NULL;
 200
 201     cc->active_conn = NULL;
 202     cc->active_conn_repr = NULL;
 203
 204     cc->active_handle = NULL;
 205
 206     cc->clickeditem = NULL;
 207     cc->clickedhandle = NULL;
 208
 209     cc->connpthandle = NULL;
 210     for (int i = 0; i < 2; ++i) {
 211         cc->endpt_handle[i] = NULL;
 212         cc->endpt_handler_id[i] = 0;
 213     }
 214     cc->sid = NULL;
 215     cc->eid = NULL;
 216     cc->npoints = 0;
 217     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 218 }
 219
 220
 221 static void
 222 sp_connector_context_dispose(GObject *object)
 223 {
 224     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(object);
 225
 226     cc->sel_changed_connection.disconnect();
 227
 228     if (cc->connpthandle) {
 229         g_object_unref(cc->connpthandle);
 230         cc->connpthandle = NULL;
 231     }
 232     for (int i = 0; i < 2; ++i) {
 233         if (cc->endpt_handle[1]) {
 234             g_object_unref(cc->endpt_handle[i]);
 235             cc->endpt_handle[i] = NULL;
 236         }
 237     }
 238     if (cc->sid) {
 239         g_free(cc->sid);
 240         cc->sid = NULL;
 241     }
 242     if (cc->eid) {
 243         g_free(cc->eid);
 244         cc->eid = NULL;
 245     }
 246     g_assert( cc->newConnRef == NULL );
 247
 248     G_OBJECT_CLASS(parent_class)->dispose(object);
 249 }
 250
 251
 252 static void
 253 sp_connector_context_setup(SPEventContext *ec)
 254 {
 255     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 256     SPDesktop *dt = ec->desktop;
 257
 258     if (((SPEventContextClass *) parent_class)->setup) {
 259         ((SPEventContextClass *) parent_class)->setup(ec);
 260     }
 261
 262     cc->selection = sp_desktop_selection(dt);
 263
 264     cc->sel_changed_connection.disconnect();
 265     cc->sel_changed_connection = cc->selection->connectChanged(
 266             sigc::bind(sigc::ptr_fun(&cc_selection_changed),
 267             (gpointer) cc));
 268
 269     /* Create red bpath */
 270     cc->red_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 271     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cc->red_bpath), cc->red_color,
 272             1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 273     sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cc->red_bpath), 0x00000000,
 274             SP_WIND_RULE_NONZERO);
 275     /* Create red curve */
 276     cc->red_curve = sp_curve_new_sized(4);
 277
 278     /* Create green curve */
 279     cc->green_curve = sp_curve_new_sized(64);
 280
 281     // Notice the initial selection.
 282     cc_selection_changed(cc->selection, (gpointer) cc);
 283
 284     if (prefs_get_int_attribute("tools.connector", "selcue", 0) != 0) {
 285         ec->enableSelectionCue();
 286     }
 287
 288     // Make sure we see all enter events for canvas items,
 289     // even if a mouse button is depressed.
 290     dt->canvas->gen_all_enter_events = true;
 291 }
 292
 293
 294 static void
 295 sp_connector_context_finish(SPEventContext *ec)
 296 {
 297     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 298
 299     spcc_connector_finish(cc);
 300
 301     if (((SPEventContextClass *) parent_class)->finish) {
 302         ((SPEventContextClass *) parent_class)->finish(ec);
 303     }
 304
 305     if (cc->selection) {
 306         cc->selection = NULL;
 307     }
 308     cc_clear_active_shape(cc);
 309     cc_clear_active_conn(cc);
 310
 311     // Restore the default event generating behaviour.
 312     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(ec);
 313     desktop->canvas->gen_all_enter_events = false;
 314 }
 315
 316
 317 //-----------------------------------------------------------------------------
 318
 319
 320 static void
 321 cc_clear_active_shape(SPConnectorContext *cc)
 322 {
 323     if (cc->active_shape == NULL) {
 324         return;
 325     }
 326     g_assert( cc->active_shape_repr );
 327     g_assert( cc->active_shape_layer_repr );
 328
 329     cc->active_shape = NULL;
 330
 331     if (cc->active_shape_repr) {
 332         sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
 333         Inkscape::GC::release(cc->active_shape_repr);
 334         cc->active_shape_repr = NULL;
 335
 336         sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
 337         Inkscape::GC::release(cc->active_shape_layer_repr);
 338         cc->active_shape_layer_repr = NULL;
 339     }
 340
 341     // Hide the center connection point if it exists.
 342     if (cc->connpthandle) {
 343         sp_knot_hide(cc->connpthandle);
 344     }
 345 }
 346
 347
 348 static void
 349 cc_clear_active_conn(SPConnectorContext *cc)
 350 {
 351     if (cc->active_conn == NULL) {
 352         return;
 353     }
 354     g_assert( cc->active_conn_repr );
 355
 356     cc->active_conn = NULL;
 357
 358     if (cc->active_conn_repr) {
 359         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
 360         Inkscape::GC::release(cc->active_conn_repr);
 361         cc->active_conn_repr = NULL;
 362     }
 363
 364     // Hide the endpoint handles.
 365     for (int i = 0; i < 2; ++i) {
 366         if (cc->endpt_handle[i]) {
 367             sp_knot_hide(cc->endpt_handle[i]);
 368         }
 369     }
 370 }
 371
 372
 373 static gchar *
 374 conn_pt_handle_test(SPConnectorContext *cc, NR::Point& p)
 375 {
 376     // TODO: this will need to change when there are more connection
 377     //       points available for each shape.
 378
 379     SPKnot *centerpt = cc->connpthandle;
 380     if (cc->active_handle && (cc->active_handle == centerpt))
 381     {
 382         p = centerpt->pos;
 383         return g_strdup_printf("#%s", SP_OBJECT_ID(cc->active_shape));
 384     }
 385     return NULL;
 386 }
 387
 388
 389
 390 static gint
 391 sp_connector_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 392 {
 393     gint ret = FALSE;
 394
 395     SPDesktop *desktop = event_context->desktop;
 396
 397     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(event_context);
 398
 399     NR::Point p(event->button.x, event->button.y);
 400
 401     switch (event->type) {
 402         case GDK_BUTTON_RELEASE:
 403             if (event->button.button == 1 && !event_context->space_panning) {
 404                 if ((cc->state == SP_CONNECTOR_CONTEXT_DRAGGING) &&
 405                         (connector_within_tolerance))
 406                 {
 407                     spcc_reset_colors(cc);
 408                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 409                 }
 410                 if (cc->state != SP_CONNECTOR_CONTEXT_IDLE) {
 411                     // Doing simething else like rerouting.
 412                     break;
 413                 }
 414                 // find out clicked item, disregarding groups, honoring Alt
 415                 SPItem *item_ungrouped = sp_event_context_find_item(desktop,
 416                         p, event->button.state & GDK_MOD1_MASK, TRUE);
 417
 418                 if (event->button.state & GDK_SHIFT_MASK) {
 419                     cc->selection->toggle(item_ungrouped);
 420                 } else {
 421                     cc->selection->set(item_ungrouped);
 422                 }
 423                 ret = TRUE;
 424             }
 425             break;
 426         case GDK_ENTER_NOTIFY:
 427         {
 428             if (cc_item_is_shape(item)) {
 429                 // This is a shape, so show connection point(s).
 430                 if (!(cc->active_shape) ||
 431                         // Don't show handle for another handle.
 432                         (item != ((SPItem *) cc->connpthandle))) {
 433                     cc_set_active_shape(cc, item);
 434                 }
 435             }
 436             ret = TRUE;
 437             break;
 438         }
 439         default:
 440             break;
 441     }
 442
 443     return ret;
 444 }
 445
 446
 447 gint
 448 sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event)
 449 {
 450     SPConnectorContext *const cc = SP_CONNECTOR_CONTEXT(ec);
 451
 452     gint ret = FALSE;
 453
 454     switch (event->type) {
 455         case GDK_BUTTON_PRESS:
 456             ret = connector_handle_button_press(cc, event->button);
 457             break;
 458
 459         case GDK_MOTION_NOTIFY:
 460             ret = connector_handle_motion_notify(cc, event->motion);
 461             break;
 462
 463         case GDK_BUTTON_RELEASE:
 464             ret = connector_handle_button_release(cc, event->button);
 465             break;
 466         case GDK_KEY_PRESS:
 467             ret = connector_handle_key_press(cc, get_group0_keyval (&event->key));
 468             break;
 469
 470         default:
 471             break;
 472     }
 473
 474     if (!ret) {
 475         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 476             = ((SPEventContextClass *) parent_class)->root_handler;
 477         if (parent_root_handler) {
 478             ret = parent_root_handler(ec, event);
 479         }
 480     }
 481
 482     return ret;
 483 }
 484
 485
 486 static gint
 487 connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent)
 488 {
 489     NR::Point const event_w(bevent.x, bevent.y);
 490     /* Find desktop coordinates */
 491     NR::Point p = cc->desktop->w2d(event_w);
 492     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 493
 494     gint ret = FALSE;
 495     if ( bevent.button == 1 && !event_context->space_panning ) {
 496
 497         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 498
 499         if (Inkscape::have_viable_layer(desktop, cc->_message_context) == false) {
 500             return TRUE;
 501         }
 502
 503         NR::Point const event_w(bevent.x,
 504                                 bevent.y);
 505         connector_drag_origin_w = event_w;
 506         connector_within_tolerance = true;
 507
 508         NR::Point const event_dt = cc->desktop->w2d(event_w);
 509         switch (cc->state) {
 510             case SP_CONNECTOR_CONTEXT_STOP:
 511                 /* This is allowed, if we just cancelled curve */
 512             case SP_CONNECTOR_CONTEXT_IDLE:
 513             {
 514                 if ( cc->npoints == 0 ) {
 515                     /* Set start anchor */
 516                     NR::Point p;
 517
 518                     cc_clear_active_conn(cc);
 519
 520                     SP_EVENT_CONTEXT_DESKTOP(cc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new connector"));
 521
 522                     /* Create green anchor */
 523                     p = event_dt;
 524
 525                     // Test whether we clicked on a connection point
 526                     cc->sid = conn_pt_handle_test(cc, p);
 527
 528                     if (!cc->sid) {
 529                         // This is the first point, so just snap it to the grid
 530                         // as there's no other points to go off.
 531                         SnapManager const &m = cc->desktop->namedview->snap_manager;
 532                         p = m.freeSnap(Inkscape::Snapper::SNAPPOINT_NODE | Inkscape::Snapper::SNAPPOINT_BBOX,
 533                                        p, NULL).getPoint();
 534                     }
 535                     spcc_connector_set_initial_point(cc, p);
 536
 537                 }
 538                 cc->state = SP_CONNECTOR_CONTEXT_DRAGGING;
 539                 ret = TRUE;
 540                 break;
 541             }
 542             case SP_CONNECTOR_CONTEXT_DRAGGING:
 543             {
 544                 // This is the second click of a connector creation.
 545
 546                 spcc_connector_set_subsequent_point(cc, p);
 547                 spcc_connector_finish_segment(cc, p);
 548                 // Test whether we clicked on a connection point
 549                 cc->eid = conn_pt_handle_test(cc, p);
 550                 if (cc->npoints != 0) {
 551                     spcc_connector_finish(cc);
 552                 }
 553                 cc_set_active_conn(cc, cc->newconn);
 554                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 555                 ret = TRUE;
 556                 break;
 557             }
 558             case SP_CONNECTOR_CONTEXT_CLOSE:
 559             {
 560                 g_warning("Button down in CLOSE state");
 561                 break;
 562             }
 563             default:
 564                 break;
 565         }
 566     } else if (bevent.button == 3) {
 567         if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
 568             // A context menu is going to be triggered here,
 569             // so end the rerouting operation.
 570             cc_connector_rerouting_finish(cc, &p);
 571
 572             cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 573
 574             // Don't set ret to TRUE, so we drop through to the
 575             // parent handler which will open the context menu.
 576         }
 577         else if (cc->npoints != 0) {
 578             spcc_connector_finish(cc);
 579             ret = TRUE;
 580         }
 581     }
 582     return ret;
 583 }
 584
 585
 586 static gint
 587 connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent)
 588 {
 589     gint ret = FALSE;
 590     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 591
 592     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 593         // allow middle-button scrolling
 594         return FALSE;
 595     }
 596
 597     NR::Point const event_w(mevent.x, mevent.y);
 598
 599     if (connector_within_tolerance) {
 600         gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
 601                                                                "value", 0, 0, 100);
 602         if ( NR::LInfty( event_w - connector_drag_origin_w ) < tolerance ) {
 603             return FALSE;   // Do not drag if we're within tolerance from origin.
 604         }
 605     }
 606     // Once the user has moved farther than tolerance from the original location
 607     // (indicating they intend to move the object, not click), then always process
 608     // the motion notify coordinates as given (no snapping back to origin)
 609     connector_within_tolerance = false;
 610
 611     SPDesktop *const dt = cc->desktop;
 612
 613     /* Find desktop coordinates */
 614     NR::Point p = dt->w2d(event_w);
 615
 616     switch (cc->state) {
 617         case SP_CONNECTOR_CONTEXT_DRAGGING:
 618         {
 619             // This is movement during a connector creation.
 620
 621             if ( cc->npoints > 0 ) {
 622                 cc->selection->clear();
 623                 spcc_connector_set_subsequent_point(cc, p);
 624                 ret = TRUE;
 625             }
 626             break;
 627         }
 628         case SP_CONNECTOR_CONTEXT_REROUTING:
 629         {
 630             g_assert( SP_IS_PATH(cc->clickeditem));
 631
 632             // Update the hidden path
 633             NR::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
 634             NR::Matrix d2i = i2d.inverse();
 635             SPPath *path = SP_PATH(cc->clickeditem);
 636             SPCurve *curve = (SP_SHAPE(path))->curve;
 637             if (cc->clickedhandle == cc->endpt_handle[0]) {
 638                 NR::Point o = cc->endpt_handle[1]->pos;
 639                 sp_curve_stretch_endpoints(curve, p * d2i, o * d2i);
 640             }
 641             else {
 642                 NR::Point o = cc->endpt_handle[0]->pos;
 643                 sp_curve_stretch_endpoints(curve, o * d2i, p * d2i);
 644             }
 645             sp_conn_adjust_path(path);
 646
 647             // Copy this to the temporary visible path
 648             cc->red_curve = sp_curve_copy(SP_SHAPE(path)->curve);
 649             sp_curve_transform(cc->red_curve, i2d);
 650
 651             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 652             ret = TRUE;
 653             break;
 654         }
 655         case SP_CONNECTOR_CONTEXT_STOP:
 656             /* This is perfectly valid */
 657             break;
 658         default:
 659             break;
 660     }
 661
 662     return ret;
 663 }
 664
 665
 666 static gint
 667 connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent)
 668 {
 669     gint ret = FALSE;
 670     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 671     if ( revent.button == 1 && !event_context->space_panning ) {
 672
 673         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 674         SPDocument *doc = sp_desktop_document(desktop);
 675
 676         NR::Point const event_w(revent.x, revent.y);
 677
 678         /* Find desktop coordinates */
 679         NR::Point p = cc->desktop->w2d(event_w);
 680
 681         switch (cc->state) {
 682             //case SP_CONNECTOR_CONTEXT_POINT:
 683             case SP_CONNECTOR_CONTEXT_DRAGGING:
 684             {
 685                 if (connector_within_tolerance)
 686                 {
 687                     spcc_connector_finish_segment(cc, p);
 688                     return TRUE;
 689                 }
 690                 // Connector has been created via a drag, end it now.
 691                 spcc_connector_set_subsequent_point(cc, p);
 692                 spcc_connector_finish_segment(cc, p);
 693                 // Test whether we clicked on a connection point
 694                 cc->eid = conn_pt_handle_test(cc, p);
 695                 if (cc->npoints != 0) {
 696                     spcc_connector_finish(cc);
 697                 }
 698                 cc_set_active_conn(cc, cc->newconn);
 699                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 700                 break;
 701             }
 702             case SP_CONNECTOR_CONTEXT_REROUTING:
 703             {
 704                 cc_connector_rerouting_finish(cc, &p);
 705
 706                 sp_document_ensure_up_to_date(doc);
 707                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 708                 return TRUE;
 709                 break;
 710             }
 711             case SP_CONNECTOR_CONTEXT_STOP:
 712                 /* This is allowed, if we just cancelled curve */
 713                 break;
 714             default:
 715                 break;
 716         }
 717         ret = TRUE;
 718     }
 719
 720     return ret;
 721 }
 722
 723
 724 static gint
 725 connector_handle_key_press(SPConnectorContext *const cc, guint const keyval)
 726 {
 727     gint ret = FALSE;
 728     /* fixme: */
 729     switch (keyval) {
 730         case GDK_Return:
 731         case GDK_KP_Enter:
 732             if (cc->npoints != 0) {
 733                 spcc_connector_finish(cc);
 734                 ret = TRUE;
 735             }
 736             break;
 737         case GDK_Escape:
 738             if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
 739
 740                 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 741                 SPDocument *doc = sp_desktop_document(desktop);
 742
 743                 cc_connector_rerouting_finish(cc, NULL);
 744
 745                 sp_document_undo(doc);
 746
 747                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 748                 desktop->messageStack()->flash( Inkscape::NORMAL_MESSAGE,
 749                         _("Connector endpoint drag cancelled."));
 750                 ret = TRUE;
 751             }
 752             else if (cc->npoints != 0) {
 753                 // if drawing, cancel, otherwise pass it up for deselecting
 754                 cc->state = SP_CONNECTOR_CONTEXT_STOP;
 755                 spcc_reset_colors(cc);
 756                 ret = TRUE;
 757             }
 758             break;
 759         default:
 760             break;
 761     }
 762     return ret;
 763 }
 764
 765
 766 static void
 767 cc_connector_rerouting_finish(SPConnectorContext *const cc, NR::Point *const p)
 768 {
 769     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 770     SPDocument *doc = sp_desktop_document(desktop);
 771
 772     // Clear the temporary path:
 773     sp_curve_reset(cc->red_curve);
 774     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 775
 776     if (p != NULL)
 777     {
 778         // Test whether we clicked on a connection point
 779         gchar *shape_label = conn_pt_handle_test(cc, *p);
 780
 781         if (shape_label) {
 782             if (cc->clickedhandle == cc->endpt_handle[0]) {
 783                 sp_object_setAttribute(cc->clickeditem,
 784                         "inkscape:connection-start",shape_label, false);
 785             }
 786             else {
 787                 sp_object_setAttribute(cc->clickeditem,
 788                         "inkscape:connection-end",shape_label, false);
 789             }
 790             g_free(shape_label);
 791         }
 792     }
 793     cc->clickeditem->setHidden(false);
 794     sp_conn_adjust_path(SP_PATH(cc->clickeditem));
 795     cc->clickeditem->updateRepr();
 796     sp_document_done(doc, SP_VERB_CONTEXT_CONNECTOR,
 797                      _("Reroute connector"));
 798     cc_set_active_conn(cc, cc->clickeditem);
 799 }
 800
 801
 802 static void
 803 spcc_reset_colors(SPConnectorContext *cc)
 804 {
 805     /* Red */
 806     sp_curve_reset(cc->red_curve);
 807     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 808
 809     sp_curve_reset(cc->green_curve);
 810     cc->npoints = 0;
 811 }
 812
 813
 814 static void
 815 spcc_connector_set_initial_point(SPConnectorContext *const cc, NR::Point const p)
 816 {
 817     g_assert( cc->npoints == 0 );
 818
 819     cc->p[0] = p;
 820     cc->p[1] = p;
 821     cc->npoints = 2;
 822     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 823 }
 824
 825
 826 static void
 827 spcc_connector_set_subsequent_point(SPConnectorContext *const cc, NR::Point const p)
 828 {
 829     g_assert( cc->npoints != 0 );
 830
 831     SPDesktop *dt = cc->desktop;
 832     NR::Point o = dt->dt2doc(cc->p[0]);
 833     NR::Point d = dt->dt2doc(p);
 834     Avoid::Point src(o[NR::X], o[NR::Y]);
 835     Avoid::Point dst(d[NR::X], d[NR::Y]);
 836
 837     if (!cc->newConnRef) {
 838         Avoid::Router *router = sp_desktop_document(dt)->router;
 839         cc->newConnRef = new Avoid::ConnRef(router, 0, src, dst);
 840         cc->newConnRef->updateEndPoint(Avoid::VertID::src, src);
 841     }
 842     cc->newConnRef->updateEndPoint(Avoid::VertID::tar, dst);
 843
 844     cc->newConnRef->makePathInvalid();
 845     cc->newConnRef->generatePath(src, dst);
 846
 847     Avoid::PolyLine route = cc->newConnRef->route();
 848     cc->newConnRef->calcRouteDist();
 849
 850     sp_curve_reset(cc->red_curve);
 851     NR::Point pt(route.ps[0].x, route.ps[0].y);
 852     sp_curve_moveto(cc->red_curve, pt);
 853
 854     for (int i = 1; i < route.pn; ++i) {
 855         NR::Point p(route.ps[i].x, route.ps[i].y);
 856         sp_curve_lineto(cc->red_curve, p);
 857     }
 858     sp_curve_transform(cc->red_curve, dt->doc2dt());
 859     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 860 }
 861
 862
 863 /**
 864  * Concats red, blue and green.
 865  * If any anchors are defined, process these, optionally removing curves from white list
 866  * Invoke _flush_white to write result back to object.
 867  */
 868 static void
 869 spcc_concat_colors_and_flush(SPConnectorContext *cc)
 870 {
 871     SPCurve *c = cc->green_curve;
 872     cc->green_curve = sp_curve_new_sized(64);
 873
 874     sp_curve_reset(cc->red_curve);
 875     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 876
 877     if (sp_curve_empty(c)) {
 878         sp_curve_unref(c);
 879         return;
 880     }
 881
 882     spcc_flush_white(cc, c);
 883
 884     sp_curve_unref(c);
 885 }
 886
 887
 888 /*
 889  * Flushes white curve(s) and additional curve into object
 890  *
 891  * No cleaning of colored curves - this has to be done by caller
 892  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
 893  *
 894  */
 895
 896 static void
 897 spcc_flush_white(SPConnectorContext *cc, SPCurve *gc)
 898 {
 899     SPCurve *c;
 900
 901     if (gc) {
 902         c = gc;
 903         sp_curve_ref(c);
 904     } else {
 905         return;
 906     }
 907
 908     /* Now we have to go back to item coordinates at last */
 909     sp_curve_transform(c,
 910             sp_desktop_dt2root_affine(SP_EVENT_CONTEXT_DESKTOP(cc)));
 911
 912     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 913     SPDocument *doc = sp_desktop_document(desktop);
 914     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
 915
 916     if ( c && !sp_curve_empty(c) ) {
 917         /* We actually have something to write */
 918
 919         Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 920         /* Set style */
 921         sp_desktop_apply_style_tool(desktop, repr, "tools.connector", false);
 922
 923         gchar *str = sp_svg_write_path(SP_CURVE_BPATH(c));
 924         g_assert( str != NULL );
 925         repr->setAttribute("d", str);
 926         g_free(str);
 927
 928         /* Attach repr */
 929         cc->newconn = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 930         cc->selection->set(repr);
 931         Inkscape::GC::release(repr);
 932         cc->newconn->transform = i2i_affine(desktop->currentRoot(), desktop->currentLayer());
 933         cc->newconn->updateRepr();
 934
 935         bool connection = false;
 936         sp_object_setAttribute(cc->newconn, "inkscape:connector-type",
 937                 "polyline", false);
 938         if (cc->sid)
 939         {
 940             sp_object_setAttribute(cc->newconn, "inkscape:connection-start",
 941                     cc->sid, false);
 942             connection = true;
 943         }
 944
 945         if (cc->eid)
 946         {
 947             sp_object_setAttribute(cc->newconn, "inkscape:connection-end",
 948                     cc->eid, false);
 949             connection = true;
 950         }
 951         cc->newconn->updateRepr();
 952         if (connection) {
 953             // Adjust endpoints to shape edge.
 954             sp_conn_adjust_path(SP_PATH(cc->newconn));
 955         }
 956         cc->newconn->updateRepr();
 957     }
 958
 959     sp_curve_unref(c);
 960
 961     /* Flush pending updates */
 962     sp_document_done(doc, SP_VERB_CONTEXT_CONNECTOR, _("Create connector"));
 963     sp_document_ensure_up_to_date(doc);
 964 }
 965
 966
 967 static void
 968 spcc_connector_finish_segment(SPConnectorContext *const cc, NR::Point const p)
 969 {
 970     if (!sp_curve_empty(cc->red_curve)) {
 971         sp_curve_append_continuous(cc->green_curve, cc->red_curve, 0.0625);
 972
 973         cc->p[0] = cc->p[3];
 974         cc->p[1] = cc->p[4];
 975         cc->npoints = 2;
 976
 977         sp_curve_reset(cc->red_curve);
 978     }
 979 }
 980
 981
 982 static void
 983 spcc_connector_finish(SPConnectorContext *const cc)
 984 {
 985     SPDesktop *const desktop = cc->desktop;
 986     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Finishing connector"));
 987
 988     sp_curve_reset(cc->red_curve);
 989     spcc_concat_colors_and_flush(cc);
 990
 991     cc->npoints = 0;
 992
 993     if (cc->newConnRef) {
 994         cc->newConnRef->removeFromGraph();
 995         delete cc->newConnRef;
 996         cc->newConnRef = NULL;
 997     }
 998     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 999 }
1000
1001
1002 static gboolean
1003 cc_generic_knot_handler(SPCanvasItem *, GdkEvent *event, SPKnot *knot)
1004 {
1005     g_assert (knot != NULL);
1006
1007     g_object_ref(knot);
1008
1009     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(
1010             knot->desktop->event_context);
1011
1012     gboolean consumed = FALSE;
1013
1014     switch (event->type) {
1015         case GDK_ENTER_NOTIFY:
1016             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, TRUE);
1017
1018             cc->active_handle = knot;
1019
1020             if (knot->tip)
1021             {
1022                 knot->desktop->event_context->defaultMessageContext()->set(
1023                         Inkscape::NORMAL_MESSAGE, knot->tip);
1024             }
1025
1026             consumed = TRUE;
1027             break;
1028         case GDK_LEAVE_NOTIFY:
1029             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, FALSE);
1030
1031             cc->active_handle = NULL;
1032
1033             if (knot->tip) {
1034                 knot->desktop->event_context->defaultMessageContext()->clear();
1035             }
1036
1037             consumed = TRUE;
1038             break;
1039         default:
1040             break;
1041     }
1042
1043     g_object_unref(knot);
1044
1045     return consumed;
1046 }
1047
1048
1049 static gboolean
1050 endpt_handler(SPKnot *knot, GdkEvent *event, SPConnectorContext *cc)
1051 {
1052     g_assert( SP_IS_CONNECTOR_CONTEXT(cc) );
1053
1054     gboolean consumed = FALSE;
1055
1056     switch (event->type) {
1057         case GDK_BUTTON_PRESS:
1058             g_assert( (cc->active_handle == cc->endpt_handle[0]) ||
1059                       (cc->active_handle == cc->endpt_handle[1]) );
1060             if (cc->state == SP_CONNECTOR_CONTEXT_IDLE) {
1061                 cc->clickeditem = cc->active_conn;
1062                 cc->clickedhandle = cc->active_handle;
1063                 cc_clear_active_conn(cc);
1064                 cc->state = SP_CONNECTOR_CONTEXT_REROUTING;
1065
1066                 // Disconnect from attached shape
1067                 unsigned ind = (cc->active_handle == cc->endpt_handle[0]) ? 0 : 1;
1068                 sp_conn_end_detach(cc->clickeditem, ind);
1069
1070                 NR::Point origin;
1071                 if (cc->clickedhandle == cc->endpt_handle[0]) {
1072                     origin = cc->endpt_handle[1]->pos;
1073                 }
1074                 else {
1075                     origin = cc->endpt_handle[0]->pos;
1076                 }
1077
1078                 // Show the red path for dragging.
1079                 cc->red_curve = sp_curve_copy(SP_PATH(cc->clickeditem)->curve);
1080                 NR::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
1081                 sp_curve_transform(cc->red_curve, i2d);
1082                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath),
1083                         cc->red_curve);
1084
1085                 cc->clickeditem->setHidden(true);
1086
1087                 // The rest of the interaction rerouting the connector is
1088                 // handled by the context root handler.
1089                 consumed = TRUE;
1090             }
1091             break;
1092         default:
1093             break;
1094     }
1095
1096     return consumed;
1097 }
1098
1099
1100 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item)
1101 {
1102     g_assert(item != NULL );
1103
1104     cc->active_shape = item;
1105
1106     // Remove existing active shape listeners
1107     if (cc->active_shape_repr) {
1108         sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
1109         Inkscape::GC::release(cc->active_shape_repr);
1110
1111         sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
1112         Inkscape::GC::release(cc->active_shape_layer_repr);
1113     }
1114
1115     // Listen in case the active shape changes
1116     cc->active_shape_repr = SP_OBJECT_REPR(item);
1117     if (cc->active_shape_repr) {
1118         Inkscape::GC::anchor(cc->active_shape_repr);
1119         sp_repr_add_listener(cc->active_shape_repr, &shape_repr_events, cc);
1120
1121         cc->active_shape_layer_repr = cc->active_shape_repr->parent();
1122         Inkscape::GC::anchor(cc->active_shape_layer_repr);
1123         sp_repr_add_listener(cc->active_shape_layer_repr, &layer_repr_events, cc);
1124     }
1125
1126
1127     // Set center connection point.
1128     if ( cc->connpthandle == NULL ) {
1129         SPKnot *knot = sp_knot_new(cc->desktop,
1130                 _("<b>Connection point</b>: click or drag to create a new connector"));
1131
1132         knot->setShape(SP_KNOT_SHAPE_SQUARE);
1133         knot->setSize(8);
1134         knot->setAnchor(GTK_ANCHOR_CENTER);
1135         knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1136         sp_knot_update_ctrl(knot);
1137
1138         // We don't want to use the standard knot handler,
1139         //since we don't want this knot to be draggable.
1140         g_signal_handler_disconnect(G_OBJECT(knot->item),
1141                 knot->_event_handler_id);
1142         knot->_event_handler_id = 0;
1143
1144         gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1145                 GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1146
1147         cc->connpthandle = knot;
1148     }
1149
1150
1151     NR::Maybe<NR::Rect> bbox = sp_item_bbox_desktop(cc->active_shape);
1152     if (bbox) {
1153         NR::Point center = bbox->midpoint();
1154         sp_knot_set_position(cc->connpthandle, &center, 0);
1155         sp_knot_show(cc->connpthandle);
1156     } else {
1157         sp_knot_hide(cc->connpthandle);
1158     }
1159 }
1160
1161
1162 static void
1163 cc_set_active_conn(SPConnectorContext *cc, SPItem *item)
1164 {
1165     g_assert( SP_IS_PATH(item) );
1166
1167     SPCurve *curve = SP_SHAPE(SP_PATH(item))->curve;
1168     NR::Matrix i2d = sp_item_i2d_affine(item);
1169
1170     if (cc->active_conn == item)
1171     {
1172         // Just adjust handle positions.
1173         NR::Point startpt = sp_curve_first_point(curve) * i2d;
1174         sp_knot_set_position(cc->endpt_handle[0], &startpt, 0);
1175
1176         NR::Point endpt = sp_curve_last_point(curve) * i2d;
1177         sp_knot_set_position(cc->endpt_handle[1], &endpt, 0);
1178
1179         return;
1180     }
1181
1182     cc->active_conn = item;
1183
1184     // Remove existing active conn listeners
1185     if (cc->active_conn_repr) {
1186         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
1187         Inkscape::GC::release(cc->active_conn_repr);
1188         cc->active_conn_repr = NULL;
1189     }
1190
1191     // Listen in case the active conn changes
1192     cc->active_conn_repr = SP_OBJECT_REPR(item);
1193     if (cc->active_conn_repr) {
1194         Inkscape::GC::anchor(cc->active_conn_repr);
1195         sp_repr_add_listener(cc->active_conn_repr, &shape_repr_events, cc);
1196     }
1197
1198     for (int i = 0; i < 2; ++i) {
1199
1200         // Create the handle if it doesn't exist
1201         if ( cc->endpt_handle[i] == NULL ) {
1202             SPKnot *knot = sp_knot_new(cc->desktop,
1203                     _("<b>Connector endpoint</b>: drag to reroute or connect to new shapes"));
1204
1205             knot->setShape(SP_KNOT_SHAPE_SQUARE);
1206             knot->setSize(7);
1207             knot->setAnchor(GTK_ANCHOR_CENTER);
1208             knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1209             knot->setStroke(0x000000ff, 0x000000ff, 0x000000ff);
1210             sp_knot_update_ctrl(knot);
1211
1212             // We don't want to use the standard knot handler,
1213             //since we don't want this knot to be draggable.
1214             g_signal_handler_disconnect(G_OBJECT(knot->item),
1215                     knot->_event_handler_id);
1216             knot->_event_handler_id = 0;
1217
1218             gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1219                     GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1220
1221             cc->endpt_handle[i] = knot;
1222         }
1223
1224         // Remove any existing handlers
1225         if (cc->endpt_handler_id[i]) {
1226             g_signal_handlers_disconnect_by_func(
1227                     G_OBJECT(cc->endpt_handle[i]->item),
1228                     (void*)G_CALLBACK(endpt_handler), (gpointer) cc );
1229             cc->endpt_handler_id[i] = 0;
1230         }
1231
1232         // Setup handlers for connector endpoints, this is
1233         // is as 'after' so that cc_generic_knot_handler is
1234         // triggered first for any endpoint.
1235         cc->endpt_handler_id[i] = g_signal_connect_after(
1236                 G_OBJECT(cc->endpt_handle[i]->item), "event",
1237                 G_CALLBACK(endpt_handler), cc);
1238     }
1239
1240     NR::Point startpt = sp_curve_first_point(curve) * i2d;
1241     sp_knot_set_position(cc->endpt_handle[0], &startpt, 0);
1242
1243     NR::Point endpt = sp_curve_last_point(curve) * i2d;
1244     sp_knot_set_position(cc->endpt_handle[1], &endpt, 0);
1245
1246     sp_knot_show(cc->endpt_handle[0]);
1247     sp_knot_show(cc->endpt_handle[1]);
1248 }
1249
1250
1251 static bool cc_item_is_shape(SPItem *item)
1252 {
1253     if (SP_IS_PATH(item)) {
1254         SPCurve *curve = (SP_SHAPE(item))->curve;
1255         if ( curve && !(curve->closed) ) {
1256             // Open paths are connectors.
1257             return false;
1258         }
1259     }
1260     else if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
1261         if (prefs_get_int_attribute("tools.connector", "ignoretext", 1) == 1) {
1262             // Don't count text as a shape we can connect connector to.
1263             return false;
1264         }
1265     }
1266     return true;
1267 }
1268
1269
1270 bool cc_item_is_connector(SPItem *item)
1271 {
1272     if (SP_IS_PATH(item)) {
1273         if (SP_PATH(item)->connEndPair.isAutoRoutingConn()) {
1274             g_assert( !(SP_SHAPE(item)->curve->closed) );
1275             return true;
1276         }
1277     }
1278     return false;
1279 }
1280
1281
1282 void cc_selection_set_avoid(bool const set_avoid)
1283 {
1284     SPDesktop *desktop = inkscape_active_desktop();
1285     if (desktop == NULL) {
1286         return;
1287     }
1288
1289     SPDocument *document = sp_desktop_document(desktop);
1290
1291     Inkscape::Selection *selection = sp_desktop_selection(desktop);
1292
1293     GSList *l = (GSList *) selection->itemList();
1294
1295     int changes = 0;
1296
1297     while (l) {
1298         SPItem *item = (SPItem *) l->data;
1299
1300         char const *value = (set_avoid) ? "true" : NULL;
1301
1302         if (cc_item_is_shape(item)) {
1303             sp_object_setAttribute(item, "inkscape:connector-avoid",
1304                     value, false);
1305             item->avoidRef->handleSettingChange();
1306             changes++;
1307         }
1308
1309         l = l->next;
1310     }
1311
1312     if (changes == 0) {
1313         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE,
1314                 _("Select <b>at least one non-connector object</b>."));
1315         return;
1316     }
1317
1318     char *event_desc = (set_avoid) ?
1319             _("Make connectors avoid selected objects") :
1320             _("Make connectors ignore selected objects");
1321     sp_document_done(document, SP_VERB_CONTEXT_CONNECTOR, event_desc);
1322 }
1323
1324
1325 static void
1326 cc_selection_changed(Inkscape::Selection *selection, gpointer data)
1327 {
1328     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1329     //SPEventContext *ec = SP_EVENT_CONTEXT(cc);
1330
1331     SPItem *item = selection->singleItem();
1332
1333     if (cc->active_conn == item)
1334     {
1335         // Nothing to change.
1336         return;
1337     }
1338     if (item == NULL)
1339     {
1340         cc_clear_active_conn(cc);
1341         return;
1342     }
1343
1344     if (cc_item_is_connector(item)) {
1345         cc_set_active_conn(cc, item);
1346     }
1347 }
1348
1349
1350 static void
1351 shape_event_attr_deleted(Inkscape::XML::Node *repr, Inkscape::XML::Node *child,
1352         Inkscape::XML::Node *ref, gpointer data)
1353 {
1354     g_assert(data);
1355     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1356
1357     if (child == cc->active_shape_repr) {
1358         // The active shape has been deleted.  Clear active shape.
1359         cc_clear_active_shape(cc);
1360     }
1361 }
1362
1363
1364 static void
1365 shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
1366                             gchar const *old_value, gchar const *new_value,
1367                             bool is_interactive, gpointer data)
1368 {
1369     g_assert(data);
1370     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1371
1372     // Look for changes than result in onscreen movement.
1373     if (!strcmp(name, "d") || !strcmp(name, "x") || !strcmp(name, "y") ||
1374             !strcmp(name, "width") || !strcmp(name, "height") ||
1375             !strcmp(name, "transform"))
1376     {
1377         if (repr == cc->active_shape_repr) {
1378             // Active shape has moved. Clear active shape.
1379             cc_clear_active_shape(cc);
1380         }
1381         else if (repr == cc->active_conn_repr) {
1382             // The active conn has been moved.
1383             // Set it again, which just sets new handle positions.
1384             cc_set_active_conn(cc, cc->active_conn);
1385         }
1386     }
1387 }
1388
1389
1390 /*
1391   Local Variables:
1392   mode:c++
1393   c-file-style:"stroustrup"
1394   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1395   indent-tabs-mode:nil
1396   fill-column:99
1397   End:
1398 */
1399 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :