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-handles.h"
  56 #include "document.h"
  57 #include "message-context.h"
  58 #include "message-stack.h"
  59 #include "selection.h"
  60 #include "inkscape.h"
  61 #include "preferences.h"
  62 #include "sp-path.h"
  63 #include "display/canvas-bpath.h"
  64 #include "display/sodipodi-ctrl.h"
  65 #include <glibmm/i18n.h>
  66 #include "snap.h"
  67 #include "knot.h"
  68 #include "sp-conn-end.h"
  69 #include "conn-avoid-ref.h"
  70 #include "libavoid/vertices.h"
  71 #include "context-fns.h"
  72 #include "sp-namedview.h"
  73 #include "sp-text.h"
  74 #include "sp-flowtext.h"
  75 #include "display/curve.h"
  76
  77 static void sp_connector_context_class_init(SPConnectorContextClass *klass);
  78 static void sp_connector_context_init(SPConnectorContext *conn_context);
  79 static void sp_connector_context_dispose(GObject *object);
  80
  81 static void sp_connector_context_setup(SPEventContext *ec);
  82 static void sp_connector_context_finish(SPEventContext *ec);
  83 static gint sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event);
  84 static gint sp_connector_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  85
  86 // Stuff borrowed from DrawContext
  87 static void spcc_connector_set_initial_point(SPConnectorContext *cc, Geom::Point const p);
  88 static void spcc_connector_set_subsequent_point(SPConnectorContext *cc, Geom::Point const p);
  89 static void spcc_connector_finish_segment(SPConnectorContext *cc, Geom::Point p);
  90 static void spcc_reset_colors(SPConnectorContext *cc);
  91 static void spcc_connector_finish(SPConnectorContext *cc);
  92 static void spcc_concat_colors_and_flush(SPConnectorContext *cc);
  93 static void spcc_flush_white(SPConnectorContext *cc, SPCurve *gc);
  94
  95 // Context event handlers
  96 static gint connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent);
  97 static gint connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent);
  98 static gint connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent);
  99 static gint connector_handle_key_press(SPConnectorContext *const cc, guint const keyval);
 100
 101 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item);
 102 static void cc_clear_active_shape(SPConnectorContext *cc);
 103 static void cc_set_active_conn(SPConnectorContext *cc, SPItem *item);
 104 static void cc_clear_active_conn(SPConnectorContext *cc);
 105 static gchar *conn_pt_handle_test(SPConnectorContext *cc, Geom::Point& w);
 106 static bool cc_item_is_shape(SPItem *item);
 107 static void cc_selection_changed(Inkscape::Selection *selection, gpointer data);
 108 static void cc_connector_rerouting_finish(SPConnectorContext *const cc,
 109         Geom::Point *const p);
 110
 111 static void shape_event_attr_deleted(Inkscape::XML::Node *repr,
 112         Inkscape::XML::Node *child, Inkscape::XML::Node *ref, gpointer data);
 113 static void shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
 114         gchar const *old_value, gchar const *new_value, bool is_interactive,
 115         gpointer data);
 116
 117
 118 static Geom::Point connector_drag_origin_w(0, 0);
 119 static bool connector_within_tolerance = false;
 120 static SPEventContextClass *parent_class;
 121
 122
 123 static Inkscape::XML::NodeEventVector shape_repr_events = {
 124     NULL, /* child_added */
 125     NULL, /* child_added */
 126     shape_event_attr_changed,
 127     NULL, /* content_changed */
 128     NULL  /* order_changed */
 129 };
 130
 131 static Inkscape::XML::NodeEventVector layer_repr_events = {
 132     NULL, /* child_added */
 133     shape_event_attr_deleted,
 134     NULL, /* child_added */
 135     NULL, /* content_changed */
 136     NULL  /* order_changed */
 137 };
 138
 139
 140 GType
 141 sp_connector_context_get_type(void)
 142 {
 143     static GType type = 0;
 144     if (!type) {
 145         GTypeInfo info = {
 146             sizeof(SPConnectorContextClass),
 147             NULL, NULL,
 148             (GClassInitFunc) sp_connector_context_class_init,
 149             NULL, NULL,
 150             sizeof(SPConnectorContext),
 151             4,
 152             (GInstanceInitFunc) sp_connector_context_init,
 153             NULL,   /* value_table */
 154         };
 155         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPConnectorContext", &info, (GTypeFlags)0);
 156     }
 157     return type;
 158 }
 159
 160 static void
 161 sp_connector_context_class_init(SPConnectorContextClass *klass)
 162 {
 163     GObjectClass *object_class;
 164     SPEventContextClass *event_context_class;
 165
 166     object_class = (GObjectClass *) klass;
 167     event_context_class = (SPEventContextClass *) klass;
 168
 169     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 170
 171     object_class->dispose = sp_connector_context_dispose;
 172
 173     event_context_class->setup = sp_connector_context_setup;
 174     event_context_class->finish = sp_connector_context_finish;
 175     event_context_class->root_handler = sp_connector_context_root_handler;
 176     event_context_class->item_handler = sp_connector_context_item_handler;
 177 }
 178
 179
 180 static void
 181 sp_connector_context_init(SPConnectorContext *cc)
 182 {
 183     SPEventContext *ec = SP_EVENT_CONTEXT(cc);
 184
 185     ec->cursor_shape = cursor_connector_xpm;
 186     ec->hot_x = 1;
 187     ec->hot_y = 1;
 188     ec->xp = 0;
 189     ec->yp = 0;
 190
 191     cc->red_color = 0xff00007f;
 192
 193     cc->newconn = NULL;
 194     cc->newConnRef = NULL;
 195
 196     cc->sel_changed_connection = sigc::connection();
 197
 198     cc->active_shape = NULL;
 199     cc->active_shape_repr = NULL;
 200     cc->active_shape_layer_repr = NULL;
 201
 202     cc->active_conn = NULL;
 203     cc->active_conn_repr = NULL;
 204
 205     cc->active_handle = NULL;
 206
 207     cc->clickeditem = NULL;
 208     cc->clickedhandle = NULL;
 209
 210     cc->connpthandle = NULL;
 211     for (int i = 0; i < 2; ++i) {
 212         cc->endpt_handle[i] = NULL;
 213         cc->endpt_handler_id[i] = 0;
 214     }
 215     cc->sid = NULL;
 216     cc->eid = NULL;
 217     cc->npoints = 0;
 218     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 219 }
 220
 221
 222 static void
 223 sp_connector_context_dispose(GObject *object)
 224 {
 225     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(object);
 226
 227     cc->sel_changed_connection.disconnect();
 228
 229     if (cc->connpthandle) {
 230         g_object_unref(cc->connpthandle);
 231         cc->connpthandle = NULL;
 232     }
 233     for (int i = 0; i < 2; ++i) {
 234         if (cc->endpt_handle[1]) {
 235             g_object_unref(cc->endpt_handle[i]);
 236             cc->endpt_handle[i] = NULL;
 237         }
 238     }
 239     if (cc->sid) {
 240         g_free(cc->sid);
 241         cc->sid = NULL;
 242     }
 243     if (cc->eid) {
 244         g_free(cc->eid);
 245         cc->eid = NULL;
 246     }
 247     g_assert( cc->newConnRef == NULL );
 248
 249     G_OBJECT_CLASS(parent_class)->dispose(object);
 250 }
 251
 252
 253 static void
 254 sp_connector_context_setup(SPEventContext *ec)
 255 {
 256     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 257     SPDesktop *dt = ec->desktop;
 258
 259     if (((SPEventContextClass *) parent_class)->setup) {
 260         ((SPEventContextClass *) parent_class)->setup(ec);
 261     }
 262
 263     cc->selection = sp_desktop_selection(dt);
 264
 265     cc->sel_changed_connection.disconnect();
 266     cc->sel_changed_connection = cc->selection->connectChanged(
 267             sigc::bind(sigc::ptr_fun(&cc_selection_changed),
 268             (gpointer) cc));
 269
 270     /* Create red bpath */
 271     cc->red_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 272     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cc->red_bpath), cc->red_color,
 273             1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 274     sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cc->red_bpath), 0x00000000,
 275             SP_WIND_RULE_NONZERO);
 276     /* Create red curve */
 277     cc->red_curve = new SPCurve();
 278
 279     /* Create green curve */
 280     cc->green_curve = new SPCurve();
 281
 282     // Notice the initial selection.
 283     cc_selection_changed(cc->selection, (gpointer) cc);
 284
 285     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 286     if (prefs->getBool("/tools/connector/selcue", 0)) {
 287         ec->enableSelectionCue();
 288     }
 289
 290     // Make sure we see all enter events for canvas items,
 291     // even if a mouse button is depressed.
 292     dt->canvas->gen_all_enter_events = true;
 293 }
 294
 295
 296 static void
 297 sp_connector_context_finish(SPEventContext *ec)
 298 {
 299     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 300
 301     spcc_connector_finish(cc);
 302     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 303
 304     if (((SPEventContextClass *) parent_class)->finish) {
 305         ((SPEventContextClass *) parent_class)->finish(ec);
 306     }
 307
 308     if (cc->selection) {
 309         cc->selection = NULL;
 310     }
 311     cc_clear_active_shape(cc);
 312     cc_clear_active_conn(cc);
 313
 314     // Restore the default event generating behaviour.
 315     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(ec);
 316     desktop->canvas->gen_all_enter_events = false;
 317 }
 318
 319
 320 //-----------------------------------------------------------------------------
 321
 322
 323 static void
 324 cc_clear_active_shape(SPConnectorContext *cc)
 325 {
 326     if (cc->active_shape == NULL) {
 327         return;
 328     }
 329     g_assert( cc->active_shape_repr );
 330     g_assert( cc->active_shape_layer_repr );
 331
 332     cc->active_shape = NULL;
 333
 334     if (cc->active_shape_repr) {
 335         sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
 336         Inkscape::GC::release(cc->active_shape_repr);
 337         cc->active_shape_repr = NULL;
 338
 339         sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
 340         Inkscape::GC::release(cc->active_shape_layer_repr);
 341         cc->active_shape_layer_repr = NULL;
 342     }
 343
 344     // Hide the center connection point if it exists.
 345     if (cc->connpthandle) {
 346         sp_knot_hide(cc->connpthandle);
 347     }
 348 }
 349
 350
 351 static void
 352 cc_clear_active_conn(SPConnectorContext *cc)
 353 {
 354     if (cc->active_conn == NULL) {
 355         return;
 356     }
 357     g_assert( cc->active_conn_repr );
 358
 359     cc->active_conn = NULL;
 360
 361     if (cc->active_conn_repr) {
 362         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
 363         Inkscape::GC::release(cc->active_conn_repr);
 364         cc->active_conn_repr = NULL;
 365     }
 366
 367     // Hide the endpoint handles.
 368     for (int i = 0; i < 2; ++i) {
 369         if (cc->endpt_handle[i]) {
 370             sp_knot_hide(cc->endpt_handle[i]);
 371         }
 372     }
 373 }
 374
 375
 376 static gchar *
 377 conn_pt_handle_test(SPConnectorContext *cc, Geom::Point& p)
 378 {
 379     // TODO: this will need to change when there are more connection
 380     //       points available for each shape.
 381
 382     SPKnot *centerpt = cc->connpthandle;
 383     if (cc->active_handle && (cc->active_handle == centerpt))
 384     {
 385         p = centerpt->pos;
 386         return g_strdup_printf("#%s", SP_OBJECT_ID(cc->active_shape));
 387     }
 388     return NULL;
 389 }
 390
 391
 392
 393 static gint
 394 sp_connector_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 395 {
 396     gint ret = FALSE;
 397
 398     SPDesktop *desktop = event_context->desktop;
 399
 400     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(event_context);
 401
 402     Geom::Point p(event->button.x, event->button.y);
 403
 404     switch (event->type) {
 405         case GDK_BUTTON_RELEASE:
 406             if (event->button.button == 1 && !event_context->space_panning) {
 407                 if ((cc->state == SP_CONNECTOR_CONTEXT_DRAGGING) &&
 408                         (connector_within_tolerance))
 409                 {
 410                     spcc_reset_colors(cc);
 411                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 412                     sp_event_context_snap_window_closed(event_context);
 413                 }
 414                 if (cc->state != SP_CONNECTOR_CONTEXT_IDLE) {
 415                     // Doing simething else like rerouting.
 416                     break;
 417                 }
 418                 // find out clicked item, disregarding groups, honoring Alt
 419                 SPItem *item_ungrouped = sp_event_context_find_item(desktop,
 420                         p, event->button.state & GDK_MOD1_MASK, TRUE);
 421
 422                 if (event->button.state & GDK_SHIFT_MASK) {
 423                     cc->selection->toggle(item_ungrouped);
 424                 } else {
 425                     cc->selection->set(item_ungrouped);
 426                 }
 427                 ret = TRUE;
 428
 429             }
 430             break;
 431         case GDK_ENTER_NOTIFY:
 432         {
 433             if (cc_item_is_shape(item)) {
 434                 // This is a shape, so show connection point(s).
 435                 if (!(cc->active_shape) ||
 436                         // Don't show handle for another handle.
 437                         (item != ((SPItem *) cc->connpthandle))) {
 438                     cc_set_active_shape(cc, item);
 439                 }
 440             }
 441             ret = TRUE;
 442             break;
 443         }
 444         default:
 445             break;
 446     }
 447
 448     return ret;
 449 }
 450
 451
 452 gint
 453 sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event)
 454 {
 455     SPConnectorContext *const cc = SP_CONNECTOR_CONTEXT(ec);
 456
 457     gint ret = FALSE;
 458
 459     switch (event->type) {
 460         case GDK_BUTTON_PRESS:
 461             ret = connector_handle_button_press(cc, event->button);
 462             break;
 463
 464         case GDK_MOTION_NOTIFY:
 465                 ret = connector_handle_motion_notify(cc, event->motion);
 466             break;
 467
 468         case GDK_BUTTON_RELEASE:
 469             ret = connector_handle_button_release(cc, event->button);
 470             break;
 471         case GDK_KEY_PRESS:
 472             ret = connector_handle_key_press(cc, get_group0_keyval (&event->key));
 473             break;
 474
 475         default:
 476             break;
 477     }
 478
 479     if (!ret) {
 480         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 481             = ((SPEventContextClass *) parent_class)->root_handler;
 482         if (parent_root_handler) {
 483             ret = parent_root_handler(ec, event);
 484         }
 485     }
 486
 487     return ret;
 488 }
 489
 490
 491 static gint
 492 connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent)
 493 {
 494     Geom::Point const event_w(bevent.x, bevent.y);
 495     /* Find desktop coordinates */
 496     Geom::Point p = cc->desktop->w2d(event_w);
 497     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 498
 499     gint ret = FALSE;
 500     if ( bevent.button == 1 && !event_context->space_panning ) {
 501
 502         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 503
 504         if (Inkscape::have_viable_layer(desktop, cc->_message_context) == false) {
 505             return TRUE;
 506         }
 507
 508         Geom::Point const event_w(bevent.x,
 509                                 bevent.y);
 510         connector_drag_origin_w = event_w;
 511         connector_within_tolerance = true;
 512
 513         Geom::Point const event_dt = cc->desktop->w2d(event_w);
 514
 515         SnapManager &m = cc->desktop->namedview->snap_manager;
 516                 m.setup(cc->desktop);
 517
 518         switch (cc->state) {
 519             case SP_CONNECTOR_CONTEXT_STOP:
 520                 /* This is allowed, if we just cancelled curve */
 521             case SP_CONNECTOR_CONTEXT_IDLE:
 522             {
 523                 if ( cc->npoints == 0 ) {
 524                     cc_clear_active_conn(cc);
 525
 526                     SP_EVENT_CONTEXT_DESKTOP(cc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new connector"));
 527
 528                     /* Set start anchor */
 529                     /* Create green anchor */
 530                     Geom::Point p = event_dt;
 531
 532                     // Test whether we clicked on a connection point
 533                     cc->sid = conn_pt_handle_test(cc, p);
 534
 535                     sp_event_context_snap_window_open(event_context);
 536
 537                     if (!cc->sid) {
 538                         // This is the first point, so just snap it to the grid
 539                         // as there's no other points to go off.
 540                         m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, p, Inkscape::SNAPSOURCE_HANDLE);
 541                     }
 542                     spcc_connector_set_initial_point(cc, p);
 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                 m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, p, Inkscape::SNAPSOURCE_HANDLE);
 553
 554                 spcc_connector_set_subsequent_point(cc, p);
 555                 spcc_connector_finish_segment(cc, p);
 556                 // Test whether we clicked on a connection point
 557                 cc->eid = conn_pt_handle_test(cc, p);
 558                 if (cc->npoints != 0) {
 559                     spcc_connector_finish(cc);
 560                 }
 561                 cc_set_active_conn(cc, cc->newconn);
 562                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 563                 sp_event_context_snap_window_closed(event_context);
 564                 ret = TRUE;
 565                 break;
 566             }
 567             case SP_CONNECTOR_CONTEXT_CLOSE:
 568             {
 569                 g_warning("Button down in CLOSE state");
 570                 break;
 571             }
 572             default:
 573                 break;
 574         }
 575     } else if (bevent.button == 3) {
 576         if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
 577             // A context menu is going to be triggered here,
 578             // so end the rerouting operation.
 579             cc_connector_rerouting_finish(cc, &p);
 580
 581             cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 582             sp_event_context_snap_window_closed(event_context);
 583
 584             // Don't set ret to TRUE, so we drop through to the
 585             // parent handler which will open the context menu.
 586         }
 587         else if (cc->npoints != 0) {
 588             spcc_connector_finish(cc);
 589             cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 590             sp_event_context_snap_window_closed(event_context);
 591             ret = TRUE;
 592         }
 593     }
 594     return ret;
 595 }
 596
 597
 598 static gint
 599 connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent)
 600 {
 601     gint ret = FALSE;
 602     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 603     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 604
 605     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 606         // allow middle-button scrolling
 607         return FALSE;
 608     }
 609
 610     Geom::Point const event_w(mevent.x, mevent.y);
 611
 612     if (connector_within_tolerance) {
 613         gint const tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 614         if ( Geom::LInfty( event_w - connector_drag_origin_w ) < tolerance ) {
 615             return FALSE;   // Do not drag if we're within tolerance from origin.
 616         }
 617     }
 618     // Once the user has moved farther than tolerance from the original location
 619     // (indicating they intend to move the object, not click), then always process
 620     // the motion notify coordinates as given (no snapping back to origin)
 621     connector_within_tolerance = false;
 622
 623     SPDesktop *const dt = cc->desktop;
 624
 625     /* Find desktop coordinates */
 626     Geom::Point p = dt->w2d(event_w);
 627
 628     SnapManager &m = dt->namedview->snap_manager;
 629         m.setup(dt);
 630
 631     switch (cc->state) {
 632         case SP_CONNECTOR_CONTEXT_DRAGGING:
 633         {
 634             // This is movement during a connector creation.
 635                 if ( cc->npoints > 0 ) {
 636                         m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, p, Inkscape::SNAPSOURCE_HANDLE);
 637                         cc->selection->clear();
 638                 spcc_connector_set_subsequent_point(cc, p);
 639                 ret = TRUE;
 640             }
 641             break;
 642         }
 643         case SP_CONNECTOR_CONTEXT_REROUTING:
 644         {
 645             g_assert( SP_IS_PATH(cc->clickeditem));
 646
 647             m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, p, Inkscape::SNAPSOURCE_HANDLE);
 648
 649             // Update the hidden path
 650             Geom::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
 651             Geom::Matrix d2i = i2d.inverse();
 652             SPPath *path = SP_PATH(cc->clickeditem);
 653             SPCurve *curve = (SP_SHAPE(path))->curve;
 654             if (cc->clickedhandle == cc->endpt_handle[0]) {
 655                 Geom::Point o = cc->endpt_handle[1]->pos;
 656                 curve->stretch_endpoints(p * d2i, o * d2i);
 657             }
 658             else {
 659                 Geom::Point o = cc->endpt_handle[0]->pos;
 660                 curve->stretch_endpoints(o * d2i, p * d2i);
 661             }
 662             sp_conn_adjust_path(path);
 663
 664             // Copy this to the temporary visible path
 665             cc->red_curve = SP_SHAPE(path)->curve->copy();
 666             cc->red_curve->transform(i2d);
 667
 668             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 669             ret = TRUE;
 670             break;
 671         }
 672         case SP_CONNECTOR_CONTEXT_STOP:
 673             /* This is perfectly valid */
 674             break;
 675         default:
 676             break;
 677     }
 678
 679     return ret;
 680 }
 681
 682
 683 static gint
 684 connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent)
 685 {
 686     gint ret = FALSE;
 687     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 688     if ( revent.button == 1 && !event_context->space_panning ) {
 689
 690         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 691         SPDocument *doc = sp_desktop_document(desktop);
 692
 693         SnapManager &m = desktop->namedview->snap_manager;
 694                 m.setup(desktop);
 695
 696         Geom::Point const event_w(revent.x, revent.y);
 697
 698         /* Find desktop coordinates */
 699         Geom::Point p = cc->desktop->w2d(event_w);
 700
 701         switch (cc->state) {
 702             //case SP_CONNECTOR_CONTEXT_POINT:
 703             case SP_CONNECTOR_CONTEXT_DRAGGING:
 704             {
 705                 m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, p, Inkscape::SNAPSOURCE_HANDLE);
 706
 707                 if (connector_within_tolerance)
 708                 {
 709                     spcc_connector_finish_segment(cc, p);
 710                     return TRUE;
 711                 }
 712                 // Connector has been created via a drag, end it now.
 713                 spcc_connector_set_subsequent_point(cc, p);
 714                 spcc_connector_finish_segment(cc, p);
 715                 // Test whether we clicked on a connection point
 716                 cc->eid = conn_pt_handle_test(cc, p);
 717                 if (cc->npoints != 0) {
 718                     spcc_connector_finish(cc);
 719                 }
 720                 cc_set_active_conn(cc, cc->newconn);
 721                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 722                 sp_event_context_snap_window_closed(event_context);
 723                 break;
 724             }
 725             case SP_CONNECTOR_CONTEXT_REROUTING:
 726             {
 727                 m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, p, Inkscape::SNAPSOURCE_HANDLE);
 728                 cc_connector_rerouting_finish(cc, &p);
 729
 730                 sp_document_ensure_up_to_date(doc);
 731                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 732                 sp_event_context_snap_window_closed(event_context);
 733                 return TRUE;
 734                 break;
 735             }
 736             case SP_CONNECTOR_CONTEXT_STOP:
 737                 /* This is allowed, if we just cancelled curve */
 738                 break;
 739             default:
 740                 break;
 741         }
 742         ret = TRUE;
 743     }
 744
 745     return ret;
 746 }
 747
 748
 749 static gint
 750 connector_handle_key_press(SPConnectorContext *const cc, guint const keyval)
 751 {
 752     gint ret = FALSE;
 753     /* fixme: */
 754     switch (keyval) {
 755         case GDK_Return:
 756         case GDK_KP_Enter:
 757             if (cc->npoints != 0) {
 758                 spcc_connector_finish(cc);
 759                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 760                 sp_event_context_snap_window_closed(SP_EVENT_CONTEXT(cc));
 761                 ret = TRUE;
 762             }
 763             break;
 764         case GDK_Escape:
 765             if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
 766
 767                 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 768                 SPDocument *doc = sp_desktop_document(desktop);
 769
 770                 cc_connector_rerouting_finish(cc, NULL);
 771
 772                 sp_document_undo(doc);
 773
 774                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 775                 sp_event_context_snap_window_closed(SP_EVENT_CONTEXT(cc));
 776                 desktop->messageStack()->flash( Inkscape::NORMAL_MESSAGE,
 777                         _("Connector endpoint drag cancelled."));
 778                 ret = TRUE;
 779             }
 780             else if (cc->npoints != 0) {
 781                 // if drawing, cancel, otherwise pass it up for deselecting
 782                 cc->state = SP_CONNECTOR_CONTEXT_STOP;
 783                 sp_event_context_snap_window_closed(SP_EVENT_CONTEXT(cc));
 784                 spcc_reset_colors(cc);
 785                 ret = TRUE;
 786             }
 787             break;
 788         default:
 789             break;
 790     }
 791     return ret;
 792 }
 793
 794
 795 static void
 796 cc_connector_rerouting_finish(SPConnectorContext *const cc, Geom::Point *const p)
 797 {
 798     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 799     SPDocument *doc = sp_desktop_document(desktop);
 800
 801     // Clear the temporary path:
 802     cc->red_curve->reset();
 803     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 804
 805     if (p != NULL)
 806     {
 807         // Test whether we clicked on a connection point
 808         gchar *shape_label = conn_pt_handle_test(cc, *p);
 809
 810         if (shape_label) {
 811             if (cc->clickedhandle == cc->endpt_handle[0]) {
 812                 sp_object_setAttribute(cc->clickeditem,
 813                         "inkscape:connection-start",shape_label, false);
 814             }
 815             else {
 816                 sp_object_setAttribute(cc->clickeditem,
 817                         "inkscape:connection-end",shape_label, false);
 818             }
 819             g_free(shape_label);
 820         }
 821     }
 822     cc->clickeditem->setHidden(false);
 823     sp_conn_adjust_path(SP_PATH(cc->clickeditem));
 824     cc->clickeditem->updateRepr();
 825     sp_document_done(doc, SP_VERB_CONTEXT_CONNECTOR,
 826                      _("Reroute connector"));
 827     cc_set_active_conn(cc, cc->clickeditem);
 828 }
 829
 830
 831 static void
 832 spcc_reset_colors(SPConnectorContext *cc)
 833 {
 834     /* Red */
 835     cc->red_curve->reset();
 836     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 837
 838     cc->green_curve->reset();
 839     cc->npoints = 0;
 840 }
 841
 842
 843 static void
 844 spcc_connector_set_initial_point(SPConnectorContext *const cc, Geom::Point const p)
 845 {
 846     g_assert( cc->npoints == 0 );
 847
 848     cc->p[0] = p;
 849     cc->p[1] = p;
 850     cc->npoints = 2;
 851     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 852 }
 853
 854
 855 static void
 856 spcc_connector_set_subsequent_point(SPConnectorContext *const cc, Geom::Point const p)
 857 {
 858     g_assert( cc->npoints != 0 );
 859
 860     SPDesktop *dt = cc->desktop;
 861     Geom::Point o = dt->dt2doc(cc->p[0]);
 862     Geom::Point d = dt->dt2doc(p);
 863     Avoid::Point src(o[Geom::X], o[Geom::Y]);
 864     Avoid::Point dst(d[Geom::X], d[Geom::Y]);
 865
 866     if (!cc->newConnRef) {
 867         Avoid::Router *router = sp_desktop_document(dt)->router;
 868         cc->newConnRef = new Avoid::ConnRef(router, 0, src, dst);
 869         cc->newConnRef->updateEndPoint(Avoid::VertID::src, src);
 870     }
 871     cc->newConnRef->updateEndPoint(Avoid::VertID::tar, dst);
 872
 873     cc->newConnRef->makePathInvalid();
 874     cc->newConnRef->generatePath(src, dst);
 875
 876     Avoid::PolyLine route = cc->newConnRef->route();
 877     cc->newConnRef->calcRouteDist();
 878
 879     cc->red_curve->reset();
 880     Geom::Point pt(route.ps[0].x, route.ps[0].y);
 881     cc->red_curve->moveto(pt);
 882
 883     for (int i = 1; i < route.pn; ++i) {
 884         Geom::Point p(route.ps[i].x, route.ps[i].y);
 885         cc->red_curve->lineto(p);
 886     }
 887     cc->red_curve->transform(dt->doc2dt());
 888     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 889 }
 890
 891
 892 /**
 893  * Concats red, blue and green.
 894  * If any anchors are defined, process these, optionally removing curves from white list
 895  * Invoke _flush_white to write result back to object.
 896  */
 897 static void
 898 spcc_concat_colors_and_flush(SPConnectorContext *cc)
 899 {
 900     SPCurve *c = cc->green_curve;
 901     cc->green_curve = new SPCurve();
 902
 903     cc->red_curve->reset();
 904     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
 905
 906     if (c->is_empty()) {
 907         c->unref();
 908         return;
 909     }
 910
 911     spcc_flush_white(cc, c);
 912
 913     c->unref();
 914 }
 915
 916
 917 /*
 918  * Flushes white curve(s) and additional curve into object
 919  *
 920  * No cleaning of colored curves - this has to be done by caller
 921  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
 922  *
 923  */
 924
 925 static void
 926 spcc_flush_white(SPConnectorContext *cc, SPCurve *gc)
 927 {
 928     SPCurve *c;
 929
 930     if (gc) {
 931         c = gc;
 932         c->ref();
 933     } else {
 934         return;
 935     }
 936
 937     /* Now we have to go back to item coordinates at last */
 938     c->transform(SP_EVENT_CONTEXT_DESKTOP(cc)->dt2doc());
 939
 940     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 941     SPDocument *doc = sp_desktop_document(desktop);
 942     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
 943
 944     if ( c && !c->is_empty() ) {
 945         /* We actually have something to write */
 946
 947         Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 948         /* Set style */
 949         sp_desktop_apply_style_tool(desktop, repr, "/tools/connector", false);
 950
 951         gchar *str = sp_svg_write_path( c->get_pathvector() );
 952         g_assert( str != NULL );
 953         repr->setAttribute("d", str);
 954         g_free(str);
 955
 956         /* Attach repr */
 957         cc->newconn = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 958         cc->selection->set(repr);
 959         Inkscape::GC::release(repr);
 960         cc->newconn->transform = sp_item_i2doc_affine(SP_ITEM(desktop->currentLayer())).inverse();
 961         cc->newconn->updateRepr();
 962
 963         bool connection = false;
 964         sp_object_setAttribute(cc->newconn, "inkscape:connector-type",
 965                 "polyline", false);
 966         if (cc->sid)
 967         {
 968             sp_object_setAttribute(cc->newconn, "inkscape:connection-start",
 969                     cc->sid, false);
 970             connection = true;
 971         }
 972
 973         if (cc->eid)
 974         {
 975             sp_object_setAttribute(cc->newconn, "inkscape:connection-end",
 976                     cc->eid, false);
 977             connection = true;
 978         }
 979         cc->newconn->updateRepr();
 980         if (connection) {
 981             // Adjust endpoints to shape edge.
 982             sp_conn_adjust_path(SP_PATH(cc->newconn));
 983         }
 984         cc->newconn->updateRepr();
 985     }
 986
 987     c->unref();
 988
 989     /* Flush pending updates */
 990     sp_document_done(doc, SP_VERB_CONTEXT_CONNECTOR, _("Create connector"));
 991     sp_document_ensure_up_to_date(doc);
 992 }
 993
 994
 995 static void
 996 spcc_connector_finish_segment(SPConnectorContext *const cc, Geom::Point const /*p*/)
 997 {
 998     if (!cc->red_curve->is_empty()) {
 999         cc->green_curve->append_continuous(cc->red_curve, 0.0625);
1000
1001         cc->p[0] = cc->p[3];
1002         cc->p[1] = cc->p[4];
1003         cc->npoints = 2;
1004
1005         cc->red_curve->reset();
1006     }
1007 }
1008
1009
1010 static void
1011 spcc_connector_finish(SPConnectorContext *const cc)
1012 {
1013     SPDesktop *const desktop = cc->desktop;
1014     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Finishing connector"));
1015
1016     cc->red_curve->reset();
1017     spcc_concat_colors_and_flush(cc);
1018
1019     cc->npoints = 0;
1020
1021     if (cc->newConnRef) {
1022         cc->newConnRef->removeFromGraph();
1023         delete cc->newConnRef;
1024         cc->newConnRef = NULL;
1025     }
1026 }
1027
1028
1029 static gboolean
1030 cc_generic_knot_handler(SPCanvasItem *, GdkEvent *event, SPKnot *knot)
1031 {
1032     g_assert (knot != NULL);
1033
1034     g_object_ref(knot);
1035
1036     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(
1037             knot->desktop->event_context);
1038
1039     gboolean consumed = FALSE;
1040
1041     switch (event->type) {
1042         case GDK_ENTER_NOTIFY:
1043             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, TRUE);
1044
1045             cc->active_handle = knot;
1046
1047             if (knot->tip)
1048             {
1049                 knot->desktop->event_context->defaultMessageContext()->set(
1050                         Inkscape::NORMAL_MESSAGE, knot->tip);
1051             }
1052
1053             consumed = TRUE;
1054             break;
1055         case GDK_LEAVE_NOTIFY:
1056             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, FALSE);
1057
1058             cc->active_handle = NULL;
1059
1060             if (knot->tip) {
1061                 knot->desktop->event_context->defaultMessageContext()->clear();
1062             }
1063
1064             consumed = TRUE;
1065             break;
1066         default:
1067             break;
1068     }
1069
1070     g_object_unref(knot);
1071
1072     return consumed;
1073 }
1074
1075
1076 static gboolean
1077 endpt_handler(SPKnot */*knot*/, GdkEvent *event, SPConnectorContext *cc)
1078 {
1079     g_assert( SP_IS_CONNECTOR_CONTEXT(cc) );
1080
1081     gboolean consumed = FALSE;
1082
1083     switch (event->type) {
1084         case GDK_BUTTON_PRESS:
1085             g_assert( (cc->active_handle == cc->endpt_handle[0]) ||
1086                       (cc->active_handle == cc->endpt_handle[1]) );
1087             if (cc->state == SP_CONNECTOR_CONTEXT_IDLE) {
1088                 cc->clickeditem = cc->active_conn;
1089                 cc->clickedhandle = cc->active_handle;
1090                 cc_clear_active_conn(cc);
1091                 cc->state = SP_CONNECTOR_CONTEXT_REROUTING;
1092                 sp_event_context_snap_window_open(SP_EVENT_CONTEXT(cc));
1093
1094                 // Disconnect from attached shape
1095                 unsigned ind = (cc->active_handle == cc->endpt_handle[0]) ? 0 : 1;
1096                 sp_conn_end_detach(cc->clickeditem, ind);
1097
1098                 Geom::Point origin;
1099                 if (cc->clickedhandle == cc->endpt_handle[0]) {
1100                     origin = cc->endpt_handle[1]->pos;
1101                 }
1102                 else {
1103                     origin = cc->endpt_handle[0]->pos;
1104                 }
1105
1106                 // Show the red path for dragging.
1107                 cc->red_curve = SP_PATH(cc->clickeditem)->curve->copy();
1108                 Geom::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
1109                 cc->red_curve->transform(i2d);
1110                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
1111
1112                 cc->clickeditem->setHidden(true);
1113
1114                 // The rest of the interaction rerouting the connector is
1115                 // handled by the context root handler.
1116                 consumed = TRUE;
1117             }
1118             break;
1119         default:
1120             break;
1121     }
1122
1123     return consumed;
1124 }
1125
1126
1127 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item)
1128 {
1129     g_assert(item != NULL );
1130
1131     cc->active_shape = item;
1132
1133     // Remove existing active shape listeners
1134     if (cc->active_shape_repr) {
1135         sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
1136         Inkscape::GC::release(cc->active_shape_repr);
1137
1138         sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
1139         Inkscape::GC::release(cc->active_shape_layer_repr);
1140     }
1141
1142     // Listen in case the active shape changes
1143     cc->active_shape_repr = SP_OBJECT_REPR(item);
1144     if (cc->active_shape_repr) {
1145         Inkscape::GC::anchor(cc->active_shape_repr);
1146         sp_repr_add_listener(cc->active_shape_repr, &shape_repr_events, cc);
1147
1148         cc->active_shape_layer_repr = cc->active_shape_repr->parent();
1149         Inkscape::GC::anchor(cc->active_shape_layer_repr);
1150         sp_repr_add_listener(cc->active_shape_layer_repr, &layer_repr_events, cc);
1151     }
1152
1153
1154     // Set center connection point.
1155     if ( cc->connpthandle == NULL ) {
1156         SPKnot *knot = sp_knot_new(cc->desktop,
1157                 _("<b>Connection point</b>: click or drag to create a new connector"));
1158
1159         knot->setShape(SP_KNOT_SHAPE_SQUARE);
1160         knot->setSize(8);
1161         knot->setAnchor(GTK_ANCHOR_CENTER);
1162         knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1163         sp_knot_update_ctrl(knot);
1164
1165         // We don't want to use the standard knot handler,
1166         //since we don't want this knot to be draggable.
1167         g_signal_handler_disconnect(G_OBJECT(knot->item),
1168                 knot->_event_handler_id);
1169         knot->_event_handler_id = 0;
1170
1171         gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1172                 GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1173
1174         cc->connpthandle = knot;
1175     }
1176
1177
1178     Geom::OptRect bbox = sp_item_bbox_desktop(cc->active_shape);
1179     if (bbox) {
1180         Geom::Point center = bbox->midpoint();
1181         sp_knot_set_position(cc->connpthandle, center, 0);
1182         sp_knot_show(cc->connpthandle);
1183     } else {
1184         sp_knot_hide(cc->connpthandle);
1185     }
1186 }
1187
1188
1189 static void
1190 cc_set_active_conn(SPConnectorContext *cc, SPItem *item)
1191 {
1192     g_assert( SP_IS_PATH(item) );
1193
1194     SPCurve *curve = SP_SHAPE(SP_PATH(item))->curve;
1195     Geom::Matrix i2d = sp_item_i2d_affine(item);
1196
1197     if (cc->active_conn == item)
1198     {
1199         // Just adjust handle positions.
1200         Geom::Point startpt = *(curve->first_point()) * i2d;
1201         sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1202
1203         Geom::Point endpt = *(curve->last_point()) * i2d;
1204         sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1205
1206         return;
1207     }
1208
1209     cc->active_conn = item;
1210
1211     // Remove existing active conn listeners
1212     if (cc->active_conn_repr) {
1213         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
1214         Inkscape::GC::release(cc->active_conn_repr);
1215         cc->active_conn_repr = NULL;
1216     }
1217
1218     // Listen in case the active conn changes
1219     cc->active_conn_repr = SP_OBJECT_REPR(item);
1220     if (cc->active_conn_repr) {
1221         Inkscape::GC::anchor(cc->active_conn_repr);
1222         sp_repr_add_listener(cc->active_conn_repr, &shape_repr_events, cc);
1223     }
1224
1225     for (int i = 0; i < 2; ++i) {
1226
1227         // Create the handle if it doesn't exist
1228         if ( cc->endpt_handle[i] == NULL ) {
1229             SPKnot *knot = sp_knot_new(cc->desktop,
1230                     _("<b>Connector endpoint</b>: drag to reroute or connect to new shapes"));
1231
1232             knot->setShape(SP_KNOT_SHAPE_SQUARE);
1233             knot->setSize(7);
1234             knot->setAnchor(GTK_ANCHOR_CENTER);
1235             knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1236             knot->setStroke(0x000000ff, 0x000000ff, 0x000000ff);
1237             sp_knot_update_ctrl(knot);
1238
1239             // We don't want to use the standard knot handler,
1240             //since we don't want this knot to be draggable.
1241             g_signal_handler_disconnect(G_OBJECT(knot->item),
1242                     knot->_event_handler_id);
1243             knot->_event_handler_id = 0;
1244
1245             gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1246                     GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1247
1248             cc->endpt_handle[i] = knot;
1249         }
1250
1251         // Remove any existing handlers
1252         if (cc->endpt_handler_id[i]) {
1253             g_signal_handlers_disconnect_by_func(
1254                     G_OBJECT(cc->endpt_handle[i]->item),
1255                     (void*)G_CALLBACK(endpt_handler), (gpointer) cc );
1256             cc->endpt_handler_id[i] = 0;
1257         }
1258
1259         // Setup handlers for connector endpoints, this is
1260         // is as 'after' so that cc_generic_knot_handler is
1261         // triggered first for any endpoint.
1262         cc->endpt_handler_id[i] = g_signal_connect_after(
1263                 G_OBJECT(cc->endpt_handle[i]->item), "event",
1264                 G_CALLBACK(endpt_handler), cc);
1265     }
1266
1267     Geom::Point startpt = *(curve->first_point()) * i2d;
1268     sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1269
1270     Geom::Point endpt = *(curve->last_point()) * i2d;
1271     sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1272
1273     sp_knot_show(cc->endpt_handle[0]);
1274     sp_knot_show(cc->endpt_handle[1]);
1275 }
1276
1277
1278 static bool cc_item_is_shape(SPItem *item)
1279 {
1280     if (SP_IS_PATH(item)) {
1281         SPCurve *curve = (SP_SHAPE(item))->curve;
1282         if ( curve && !(curve->is_closed()) ) {
1283             // Open paths are connectors.
1284             return false;
1285         }
1286     }
1287     else if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
1288         Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1289         if (prefs->getBool("/tools/connector/ignoretext", true)) {
1290             // Don't count text as a shape we can connect connector to.
1291             return false;
1292         }
1293     }
1294     return true;
1295 }
1296
1297
1298 bool cc_item_is_connector(SPItem *item)
1299 {
1300     if (SP_IS_PATH(item)) {
1301         if (SP_PATH(item)->connEndPair.isAutoRoutingConn()) {
1302             g_assert( !(SP_SHAPE(item)->curve->is_closed()) );
1303             return true;
1304         }
1305     }
1306     return false;
1307 }
1308
1309
1310 void cc_selection_set_avoid(bool const set_avoid)
1311 {
1312     SPDesktop *desktop = inkscape_active_desktop();
1313     if (desktop == NULL) {
1314         return;
1315     }
1316
1317     SPDocument *document = sp_desktop_document(desktop);
1318
1319     Inkscape::Selection *selection = sp_desktop_selection(desktop);
1320
1321     GSList *l = (GSList *) selection->itemList();
1322
1323     int changes = 0;
1324
1325     while (l) {
1326         SPItem *item = (SPItem *) l->data;
1327
1328         char const *value = (set_avoid) ? "true" : NULL;
1329
1330         if (cc_item_is_shape(item)) {
1331             sp_object_setAttribute(item, "inkscape:connector-avoid",
1332                     value, false);
1333             item->avoidRef->handleSettingChange();
1334             changes++;
1335         }
1336
1337         l = l->next;
1338     }
1339
1340     if (changes == 0) {
1341         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE,
1342                 _("Select <b>at least one non-connector object</b>."));
1343         return;
1344     }
1345
1346     char *event_desc = (set_avoid) ?
1347             _("Make connectors avoid selected objects") :
1348             _("Make connectors ignore selected objects");
1349     sp_document_done(document, SP_VERB_CONTEXT_CONNECTOR, event_desc);
1350 }
1351
1352
1353 static void
1354 cc_selection_changed(Inkscape::Selection *selection, gpointer data)
1355 {
1356     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1357     //SPEventContext *ec = SP_EVENT_CONTEXT(cc);
1358
1359     SPItem *item = selection->singleItem();
1360
1361     if (cc->active_conn == item)
1362     {
1363         // Nothing to change.
1364         return;
1365     }
1366     if (item == NULL)
1367     {
1368         cc_clear_active_conn(cc);
1369         return;
1370     }
1371
1372     if (cc_item_is_connector(item)) {
1373         cc_set_active_conn(cc, item);
1374     }
1375 }
1376
1377
1378 static void
1379 shape_event_attr_deleted(Inkscape::XML::Node */*repr*/, Inkscape::XML::Node *child,
1380                          Inkscape::XML::Node */*ref*/, gpointer data)
1381 {
1382     g_assert(data);
1383     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1384
1385     if (child == cc->active_shape_repr) {
1386         // The active shape has been deleted.  Clear active shape.
1387         cc_clear_active_shape(cc);
1388     }
1389 }
1390
1391
1392 static void
1393 shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
1394                          gchar const */*old_value*/, gchar const */*new_value*/,
1395                          bool /*is_interactive*/, gpointer data)
1396 {
1397     g_assert(data);
1398     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1399
1400     // Look for changes than result in onscreen movement.
1401     if (!strcmp(name, "d") || !strcmp(name, "x") || !strcmp(name, "y") ||
1402             !strcmp(name, "width") || !strcmp(name, "height") ||
1403             !strcmp(name, "transform"))
1404     {
1405         if (repr == cc->active_shape_repr) {
1406             // Active shape has moved. Clear active shape.
1407             cc_clear_active_shape(cc);
1408         }
1409         else if (repr == cc->active_conn_repr) {
1410             // The active conn has been moved.
1411             // Set it again, which just sets new handle positions.
1412             cc_set_active_conn(cc, cc->active_conn);
1413         }
1414     }
1415 }
1416
1417
1418 /*
1419   Local Variables:
1420   mode:c++
1421   c-file-style:"stroustrup"
1422   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1423   indent-tabs-mode:nil
1424   fill-column:99
1425   End:
1426 */
1427 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :