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