src/connector-context.cpp

   1 /*
   2  * Connector creation tool
   3  *
   4  * Authors:
   5  *   Michael Wybrow <mjwybrow@users.sourceforge.net>
   6  *
   7  * Copyright (C) 2005-2008  Michael Wybrow
   8  * Copyright (C) 2009  Monash University
   9  *
  10  * Released under GNU GPL, read the file 'COPYING' for more information
  11  *
  12  * TODO:
  13  *  o  Show a visual indicator for objects with the 'avoid' property set.
  14  *  o  Allow user to change a object between a path and connector through
  15  *     the interface.
  16  *  o  Create an interface for setting markers (arrow heads).
  17  *  o  Better distinguish between paths and connectors to prevent problems
  18  *     in the node tool and paths accidentally being turned into connectors
  19  *     in the connector tool.  Perhaps have a way to convert between.
  20  *  o  Only call libavoid's updateEndPoint as required.  Currently we do it
  21  *     for both endpoints, even if only one is moving.
  22  *  o  Allow user-placeable connection points.
  23  *  o  Deal sanely with connectors with both endpoints attached to the
  24  *     same connection point, and drawing of connectors attaching
  25  *     overlapping shapes (currently tries to adjust connector to be
  26  *     outside both bounding boxes).
  27  *  o  Fix many special cases related to connectors updating,
  28  *     e.g., copying a couple of shapes and a connector that are
  29  *           attached to each other.
  30  *     e.g., detach connector when it is moved or transformed in
  31  *           one of the other contexts.
  32  *  o  Cope with shapes whose ids change when they have attached
  33  *     connectors.
  34  *  o  During dragging motion, gobble up to and use the final motion event.
  35  *     Gobbling away all duplicates after the current can occasionally result
  36  *     in the path lagging behind the mouse cursor if it is no longer being
  37  *     dragged.
  38  *  o  Fix up libavoid's representation after undo actions.  It doesn't see
  39  *     any transform signals and hence doesn't know shapes have moved back to
  40  *     there earlier positions.
  41  *  o  Decide whether drawing/editing mode should be an Inkscape preference
  42  *     or the connector tool should always start in drawing mode.
  43  *  o  Correct the problem with switching to the select tool when pressing
  44  *     space bar (there are moments when it refuses to do so).
  45  *
  46  * ----------------------------------------------------------------------------
  47  *
  48  * mjwybrow's observations on acracan's Summer of Code connector work:
  49  *
  50  *  -  GUI comments:
  51  *
  52  *      -  Buttons for adding and removing user-specified connection
  53  *      points should probably have "+" and "-" symbols on them so they
  54  *      are consistent with the similar buttons for the node tool.
  55  *      -  Controls on the connector tool be should be reordered logically,
  56  *      possibly as follows:
  57  *
  58  *      *Connector*: [Polyline-radio-button] [Orthgonal-radio-button]
  59  *        [Curvature-control] | *Shape*: [Avoid-button] [Dont-avoid-button]
  60  *        [Spacing-control] | *Connection pts*: [Edit-mode] [Add-pt] [Rm-pt]
  61  *
  62  *      I think that the network layout controls be moved to the
  63  *      Align and Distribute dialog (there is already the layout button
  64  *      there, but no options are exposed).
  65  *
  66  *      I think that the style change between polyline and orthogonal
  67  *      would be much clearer with two buttons (radio behaviour -- just
  68  *      one is true).
  69  *
  70  *      The other tools show a label change from "New:" to "Change:"
  71  *      depending on whether an object is selected.  We could consider
  72  *      this but there may not be space.
  73  *
  74  *      The Add-pt and Rm-pt buttons should be greyed out (inactive) if
  75  *      we are not in connection point editing mode.  And probably also
  76  *      if there is no shape selected, i.e. at the times they have no
  77  *      effect when clicked.
  78  *
  79  *      Likewise for the avoid/ignore shapes buttons.  These should be
  80  *      inactive when a shape is not selected in the connector context.
  81  *
  82  *  -  When creating/editing connection points:
  83  *
  84  *      -  Strange things can happen if you have connectors selected, or
  85  *      try rerouting connectors by dragging their endpoints when in
  86  *      connection point editing mode.
  87  *
  88  *      -  Possibly the selected shape's connection points should always
  89  *      be shown (i.e., have knots) when in editing mode.
  90  *
  91  *      -  It is a little strange to be able to place connection points
  92  *      competely outside shapes.  Especially when you later can't draw
  93  *      connectors to them since the knots are only visible when you
  94  *      are over the shape.  I think that you should only be able to
  95  *      place connection points inside or on the boundary of the shape
  96  *      itself.
  97  *
  98  *      -  The intended ability to place a new point at the current cursor
  99  *      position by pressing RETURN does not seem to work.
 100  *
 101  *      -  The Status bar tooltip should change to reflect editing mode
 102  *      and tell the user about RETURN and how to use the tool.
 103  *
 104  *  -  Connection points general:
 105  *
 106  *      -  Connection points that were inside the shape can end up outside
 107  *      after a rotation is applied to the shape in the select tool.
 108  *      It doesn't seem like the correct transform is being applied to
 109  *      these, or it is being applied at the wrong time.  I'd expect
 110  *      connection points to rotate with the shape, and stay at the
 111  *      same position "on the shape"
 112  *
 113  *      -  I was able to make the connectors attached to a shape fall off
 114  *      the shape after scaling it.  Not sure the exact cause, but may
 115  *      require more investigation/debugging.
 116  *
 117  *      -  The user-defined connection points should be either absolute
 118  *      (as the current ones are) or defined as a percentage of the
 119  *      shape.  These would be based on a toggle setting on the
 120  *      toolbar, and they would be placed in exactly the same way by
 121  *      the user.  The only difference would be that they would be
 122  *      store as percentage positions in the SVG connection-points
 123  *      property and that they would update/move automatically if the
 124  *      object was resized or scaled.
 125  *
 126  *      -  Thinking more, I think you always want to store and think about
 127  *      the positions of connection points to be pre-transform, but
 128  *      obviously the shape transform is applied to them.  That way,
 129  *      they will rotate and scale automatically with the shape, when
 130  *      the shape transform is altered.  The Percentage version would
 131  *      compute their position from the pre-transform dimensions and
 132  *      then have the transform applied to them, for example.
 133  *
 134  *      -  The connection points in the test_connection_points.svg file
 135  *      seem to follow the shape when it is moved, but connection
 136  *      points I add to new shapes, do not follow the shape, either
 137  *      when the shape is just moved or transformed.  There is
 138  *      something wrong here.  What exactly should the behaviour be
 139  *      currently?
 140  *
 141  *      -  I see that connection points are specified at absolute canvas
 142  *      positions.  I really think that they should be specified in
 143  *      shape coordinated relative to the shapes.  There may be
 144  *      transforms applied to layers and the canvas which would make
 145  *      specifying them quite difficult.  I'd expect a position of 0, 0
 146  *      to be on the shape in question or very close to it, for example.
 147  *
 148  */
 149
 150
 151
 152 #include <gdk/gdkkeysyms.h>
 153 #include <string>
 154 #include <cstring>
 155
 156 #include "connector-context.h"
 157 #include "pixmaps/cursor-connector.xpm"
 158 #include "pixmaps/cursor-node.xpm"
 159 //#include "pixmaps/cursor-node-m.xpm"
 160 //#include "pixmaps/cursor-node-d.xpm"
 161 #include "xml/node-event-vector.h"
 162 #include "xml/repr.h"
 163 #include "svg/svg.h"
 164 #include "desktop.h"
 165 #include "desktop-style.h"
 166 #include "desktop-handles.h"
 167 #include "document.h"
 168 #include "message-context.h"
 169 #include "message-stack.h"
 170 #include "selection.h"
 171 #include "inkscape.h"
 172 #include "preferences.h"
 173 #include "sp-path.h"
 174 #include "display/canvas-bpath.h"
 175 #include "display/sodipodi-ctrl.h"
 176 #include <glibmm/i18n.h>
 177 #include <glibmm/stringutils.h>
 178 #include "snap.h"
 179 #include "knot.h"
 180 #include "sp-conn-end.h"
 181 #include "sp-conn-end-pair.h"
 182 #include "conn-avoid-ref.h"
 183 #include "libavoid/vertices.h"
 184 #include "libavoid/router.h"
 185 #include "context-fns.h"
 186 #include "sp-namedview.h"
 187 #include "sp-text.h"
 188 #include "sp-flowtext.h"
 189 #include "display/curve.h"
 190
 191 static void sp_connector_context_class_init(SPConnectorContextClass *klass);
 192 static void sp_connector_context_init(SPConnectorContext *conn_context);
 193 static void sp_connector_context_dispose(GObject *object);
 194
 195 static void sp_connector_context_setup(SPEventContext *ec);
 196 static void sp_connector_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val);
 197 static void sp_connector_context_finish(SPEventContext *ec);
 198 static gint sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event);
 199 static gint sp_connector_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
 200
 201 // Stuff borrowed from DrawContext
 202 static void spcc_connector_set_initial_point(SPConnectorContext *cc, Geom::Point const p);
 203 static void spcc_connector_set_subsequent_point(SPConnectorContext *cc, Geom::Point const p);
 204 static void spcc_connector_finish_segment(SPConnectorContext *cc, Geom::Point p);
 205 static void spcc_reset_colors(SPConnectorContext *cc);
 206 static void spcc_connector_finish(SPConnectorContext *cc);
 207 static void spcc_concat_colors_and_flush(SPConnectorContext *cc);
 208 static void spcc_flush_white(SPConnectorContext *cc, SPCurve *gc);
 209
 210 // Context event handlers
 211 static gint connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent);
 212 static gint connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent);
 213 static gint connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent);
 214 static gint connector_handle_key_press(SPConnectorContext *const cc, guint const keyval);
 215
 216 static void cc_active_shape_add_knot(SPDesktop* desktop, SPItem* item, ConnectionPointMap &cphandles, ConnectionPoint& cp);
 217 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item);
 218 static void cc_clear_active_shape(SPConnectorContext *cc);
 219 static void cc_set_active_conn(SPConnectorContext *cc, SPItem *item);
 220 static void cc_clear_active_conn(SPConnectorContext *cc);
 221 static bool conn_pt_handle_test(SPConnectorContext *cc, Geom::Point& p, gchar **href, gchar **cpid);
 222 static void cc_select_handle(SPKnot* knot);
 223 static void cc_deselect_handle(SPKnot* knot);
 224 static bool cc_item_is_shape(SPItem *item);
 225 static void cc_selection_changed(Inkscape::Selection *selection, gpointer data);
 226 static void cc_connector_rerouting_finish(SPConnectorContext *const cc,
 227         Geom::Point *const p);
 228
 229 static void shape_event_attr_deleted(Inkscape::XML::Node *repr,
 230         Inkscape::XML::Node *child, Inkscape::XML::Node *ref, gpointer data);
 231 static void shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
 232         gchar const *old_value, gchar const *new_value, bool is_interactive,
 233         gpointer data);
 234
 235
 236 static char* cc_knot_tips[] = { _("<b>Connection point</b>: click or drag to create a new connector"),
 237                            _("<b>Connection point</b>: click to select, drag to move") };
 238
 239 /*static Geom::Point connector_drag_origin_w(0, 0);
 240 static bool connector_within_tolerance = false;*/
 241 static SPEventContextClass *parent_class;
 242
 243
 244 static Inkscape::XML::NodeEventVector shape_repr_events = {
 245     NULL, /* child_added */
 246     NULL, /* child_added */
 247     shape_event_attr_changed,
 248     NULL, /* content_changed */
 249     NULL  /* order_changed */
 250 };
 251
 252 static Inkscape::XML::NodeEventVector layer_repr_events = {
 253     NULL, /* child_added */
 254     shape_event_attr_deleted,
 255     NULL, /* child_added */
 256     NULL, /* content_changed */
 257     NULL  /* order_changed */
 258 };
 259
 260
 261 GType
 262 sp_connector_context_get_type(void)
 263 {
 264     static GType type = 0;
 265     if (!type) {
 266         GTypeInfo info = {
 267             sizeof(SPConnectorContextClass),
 268             NULL, NULL,
 269             (GClassInitFunc) sp_connector_context_class_init,
 270             NULL, NULL,
 271             sizeof(SPConnectorContext),
 272             4,
 273             (GInstanceInitFunc) sp_connector_context_init,
 274             NULL,   /* value_table */
 275         };
 276         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPConnectorContext", &info, (GTypeFlags)0);
 277     }
 278     return type;
 279 }
 280
 281 static void
 282 sp_connector_context_class_init(SPConnectorContextClass *klass)
 283 {
 284     GObjectClass *object_class;
 285     SPEventContextClass *event_context_class;
 286
 287     object_class = (GObjectClass *) klass;
 288     event_context_class = (SPEventContextClass *) klass;
 289
 290     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 291
 292     object_class->dispose = sp_connector_context_dispose;
 293
 294     event_context_class->setup = sp_connector_context_setup;
 295     event_context_class->set = sp_connector_context_set;
 296     event_context_class->finish = sp_connector_context_finish;
 297     event_context_class->root_handler = sp_connector_context_root_handler;
 298     event_context_class->item_handler = sp_connector_context_item_handler;
 299 }
 300
 301
 302 static void
 303 sp_connector_context_init(SPConnectorContext *cc)
 304 {
 305     SPEventContext *ec = SP_EVENT_CONTEXT(cc);
 306
 307     ec->cursor_shape = cursor_connector_xpm;
 308     ec->hot_x = 1;
 309     ec->hot_y = 1;
 310     ec->xp = 0;
 311     ec->yp = 0;
 312
 313     cc->mode = SP_CONNECTOR_CONTEXT_DRAWING_MODE;
 314     cc->knot_tip = 0;
 315
 316     cc->red_color = 0xff00007f;
 317
 318     cc->newconn = NULL;
 319     cc->newConnRef = NULL;
 320     cc->curvature = 0.0;
 321
 322     cc->sel_changed_connection = sigc::connection();
 323
 324     cc->active_shape = NULL;
 325     cc->active_shape_repr = NULL;
 326     cc->active_shape_layer_repr = NULL;
 327
 328     cc->active_conn = NULL;
 329     cc->active_conn_repr = NULL;
 330
 331     cc->active_handle = NULL;
 332
 333     cc->selected_handle = NULL;
 334
 335     cc->clickeditem = NULL;
 336     cc->clickedhandle = NULL;
 337
 338     new (&cc->connpthandles) ConnectionPointMap();
 339
 340     for (int i = 0; i < 2; ++i) {
 341         cc->endpt_handle[i] = NULL;
 342         cc->endpt_handler_id[i] = 0;
 343     }
 344     cc->shref = NULL;
 345     cc->scpid = NULL;
 346     cc->ehref = NULL;
 347     cc->ecpid = NULL;
 348     cc->npoints = 0;
 349     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 350 }
 351
 352
 353 static void
 354 sp_connector_context_dispose(GObject *object)
 355 {
 356     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(object);
 357
 358     cc->sel_changed_connection.disconnect();
 359
 360     if (!cc->connpthandles.empty()) {
 361         for (ConnectionPointMap::iterator it = cc->connpthandles.begin();
 362                 it != cc->connpthandles.end(); ++it) {
 363             g_object_unref(it->first);
 364         }
 365         cc->connpthandles.clear();
 366     }
 367     cc->connpthandles.~ConnectionPointMap();
 368     for (int i = 0; i < 2; ++i) {
 369         if (cc->endpt_handle[1]) {
 370             g_object_unref(cc->endpt_handle[i]);
 371             cc->endpt_handle[i] = NULL;
 372         }
 373     }
 374     if (cc->shref) {
 375         g_free(cc->shref);
 376         cc->shref = NULL;
 377     }
 378     if (cc->scpid) {
 379         g_free(cc->scpid);
 380         cc->scpid = NULL;
 381     }
 382     if (cc->ehref) {
 383         g_free(cc->shref);
 384         cc->shref = NULL;
 385     }
 386     if (cc->ecpid) {
 387         g_free(cc->scpid);
 388         cc->scpid = NULL;
 389     }
 390     g_assert( cc->newConnRef == NULL );
 391
 392     G_OBJECT_CLASS(parent_class)->dispose(object);
 393 }
 394
 395
 396 static void
 397 sp_connector_context_setup(SPEventContext *ec)
 398 {
 399     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 400     SPDesktop *dt = ec->desktop;
 401
 402     if (((SPEventContextClass *) parent_class)->setup) {
 403         ((SPEventContextClass *) parent_class)->setup(ec);
 404     }
 405
 406     cc->selection = sp_desktop_selection(dt);
 407
 408     cc->sel_changed_connection.disconnect();
 409     cc->sel_changed_connection = cc->selection->connectChanged(
 410             sigc::bind(sigc::ptr_fun(&cc_selection_changed),
 411             (gpointer) cc));
 412
 413     /* Create red bpath */
 414     cc->red_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 415     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cc->red_bpath), cc->red_color,
 416             1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 417     sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cc->red_bpath), 0x00000000,
 418             SP_WIND_RULE_NONZERO);
 419     /* Create red curve */
 420     cc->red_curve = new SPCurve();
 421
 422     /* Create green curve */
 423     cc->green_curve = new SPCurve();
 424
 425     // Notice the initial selection.
 426     cc_selection_changed(cc->selection, (gpointer) cc);
 427
 428     cc->within_tolerance = false;
 429
 430     sp_event_context_read(ec, "curvature");
 431     sp_event_context_read(ec, "orthogonal");
 432     sp_event_context_read(ec, "mode");
 433     cc->knot_tip = cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE ? cc_knot_tips[0] : cc_knot_tips[1];
 434     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 435     if (prefs->getBool("/tools/connector/selcue", 0)) {
 436         ec->enableSelectionCue();
 437     }
 438
 439     // Make sure we see all enter events for canvas items,
 440     // even if a mouse button is depressed.
 441     dt->canvas->gen_all_enter_events = true;
 442 }
 443
 444
 445 static void
 446 sp_connector_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val)
 447 {
 448     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 449
 450     /* fixme: Proper error handling for non-numeric data.  Use a locale-independent function like
 451      * g_ascii_strtod (or a thin wrapper that does the right thing for invalid values inf/nan). */
 452     Glib::ustring name = val->getEntryName();
 453     if ( name == "curvature" ) {
 454         cc->curvature = val->getDoubleLimited(); // prevents NaN and +/-Inf from messing up
 455     }
 456     else if ( name == "orthogonal" ) {
 457         cc->isOrthogonal = val->getBool();
 458     }
 459     else if ( name == "mode")
 460     {
 461         sp_connector_context_switch_mode(ec, val->getBool() ? SP_CONNECTOR_CONTEXT_EDITING_MODE : SP_CONNECTOR_CONTEXT_DRAWING_MODE);
 462     }
 463 }
 464
 465 void sp_connector_context_switch_mode(SPEventContext* ec, unsigned int newMode)
 466 {
 467     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 468
 469     cc->mode = newMode;
 470     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
 471     {
 472         ec->cursor_shape = cursor_connector_xpm;
 473         cc->knot_tip = cc_knot_tips[0];
 474         if (cc->selected_handle)
 475             cc_deselect_handle( cc->selected_handle );
 476         cc->selected_handle = NULL;
 477         // Show all default connection points
 478
 479     }
 480     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
 481     {
 482         ec->cursor_shape = cursor_node_xpm;
 483         cc->knot_tip = cc_knot_tips[1];
 484 /*            if (cc->active_shape)
 485         {
 486             cc->selection->set( SP_OBJECT( cc->active_shape ) );
 487         }
 488         else
 489         {
 490             SPItem* item = cc->selection->singleItem();
 491             if ( item )
 492             {
 493                 cc_set_active_shape(cc, item);
 494                 cc->selection->set( SP_OBJECT( item ) );
 495             }
 496         }*/
 497     }
 498     sp_event_context_update_cursor(ec);
 499
 500 }
 501
 502
 503 static void
 504 sp_connector_context_finish(SPEventContext *ec)
 505 {
 506     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 507
 508     spcc_connector_finish(cc);
 509     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 510
 511     if (((SPEventContextClass *) parent_class)->finish) {
 512         ((SPEventContextClass *) parent_class)->finish(ec);
 513     }
 514
 515     if (cc->selection) {
 516         cc->selection = NULL;
 517     }
 518     cc_clear_active_shape(cc);
 519     cc_clear_active_conn(cc);
 520
 521     // Restore the default event generating behaviour.
 522     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(ec);
 523     desktop->canvas->gen_all_enter_events = false;
 524 }
 525
 526
 527 //-----------------------------------------------------------------------------
 528
 529
 530 static void
 531 cc_clear_active_shape(SPConnectorContext *cc)
 532 {
 533     if (cc->active_shape == NULL) {
 534         return;
 535     }
 536     g_assert( cc->active_shape_repr );
 537     g_assert( cc->active_shape_layer_repr );
 538
 539     cc->active_shape = NULL;
 540
 541     if (cc->active_shape_repr) {
 542         sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
 543         Inkscape::GC::release(cc->active_shape_repr);
 544         cc->active_shape_repr = NULL;
 545
 546         sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
 547         Inkscape::GC::release(cc->active_shape_layer_repr);
 548         cc->active_shape_layer_repr = NULL;
 549     }
 550
 551     // Hide the connection points if they exist.
 552     if (cc->connpthandles.size()) {
 553         for (ConnectionPointMap::iterator it = cc->connpthandles.begin();
 554                 it != cc->connpthandles.end(); ++it) {
 555             sp_knot_hide(it->first);
 556         }
 557     }
 558 }
 559
 560
 561 static void
 562 cc_clear_active_conn(SPConnectorContext *cc)
 563 {
 564     if (cc->active_conn == NULL) {
 565         return;
 566     }
 567     g_assert( cc->active_conn_repr );
 568
 569     cc->active_conn = NULL;
 570
 571     if (cc->active_conn_repr) {
 572         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
 573         Inkscape::GC::release(cc->active_conn_repr);
 574         cc->active_conn_repr = NULL;
 575     }
 576
 577     // Hide the endpoint handles.
 578     for (int i = 0; i < 2; ++i) {
 579         if (cc->endpt_handle[i]) {
 580             sp_knot_hide(cc->endpt_handle[i]);
 581         }
 582     }
 583 }
 584
 585
 586 static bool
 587 conn_pt_handle_test(SPConnectorContext *cc, Geom::Point& p, gchar **href, gchar **cpid)
 588 {
 589     // TODO: this will need to change when there are more connection
 590     //       points available for each shape.
 591
 592     if (cc->active_handle && (cc->connpthandles.find(cc->active_handle) != cc->connpthandles.end()))
 593     {
 594         p = cc->active_handle->pos;
 595         const ConnectionPoint& cp = cc->connpthandles[cc->active_handle];
 596         *href = g_strdup_printf("#%s", cc->active_shape->getId());
 597         *cpid = g_strdup_printf("%c%d", cp.type == ConnPointDefault ? 'd' : 'u' , cp.id);
 598         return true;
 599     }
 600     *href = NULL;
 601     *cpid = NULL;
 602     return false;
 603 }
 604
 605 static void
 606 cc_select_handle(SPKnot* knot)
 607 {
 608     knot->setShape(SP_KNOT_SHAPE_SQUARE);
 609     knot->setSize(10);
 610     knot->setAnchor(GTK_ANCHOR_CENTER);
 611     knot->setFill(0x0000ffff, 0x0000ffff, 0x0000ffff);
 612     sp_knot_update_ctrl(knot);
 613 }
 614
 615 static void
 616 cc_deselect_handle(SPKnot* knot)
 617 {
 618     knot->setShape(SP_KNOT_SHAPE_SQUARE);
 619     knot->setSize(8);
 620     knot->setAnchor(GTK_ANCHOR_CENTER);
 621     knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
 622     sp_knot_update_ctrl(knot);
 623 }
 624
 625 static gint
 626 sp_connector_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 627 {
 628     gint ret = FALSE;
 629
 630     SPDesktop *desktop = event_context->desktop;
 631
 632     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(event_context);
 633
 634     Geom::Point p(event->button.x, event->button.y);
 635
 636     switch (event->type) {
 637         case GDK_BUTTON_RELEASE:
 638             if (event->button.button == 1 && !event_context->space_panning) {
 639                 if ((cc->state == SP_CONNECTOR_CONTEXT_DRAGGING) &&
 640                         (event_context->within_tolerance))
 641                 {
 642                     spcc_reset_colors(cc);
 643                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 644                 }
 645                 if (cc->state != SP_CONNECTOR_CONTEXT_IDLE) {
 646                     // Doing something else like rerouting.
 647                     break;
 648                 }
 649                 // find out clicked item, honoring Alt
 650                 SPItem *item = sp_event_context_find_item(desktop,
 651                         p, event->button.state & GDK_MOD1_MASK, FALSE);
 652
 653                 if (event->button.state & GDK_SHIFT_MASK) {
 654                     cc->selection->toggle(item);
 655                 } else {
 656                     cc->selection->set(item);
 657                     if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE && cc->selected_handle )
 658                     {
 659                         cc_deselect_handle( cc->selected_handle );
 660                         cc->selected_handle = NULL;
 661                     }
 662                     /* When selecting a new item,
 663                        do not allow showing connection points
 664                        on connectors. (yet?)
 665                     */
 666                     if ( item != cc->active_shape && !cc_item_is_connector( item ) )
 667                         cc_set_active_shape( cc, item );
 668                 }
 669                 ret = TRUE;
 670
 671             }
 672             break;
 673         case GDK_ENTER_NOTIFY:
 674         {
 675             if (cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE || (cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE && !cc->selected_handle))
 676             {
 677                 if (cc_item_is_shape(item)) {
 678
 679                     // I don't really understand what the above does,
 680                     // so I commented it.
 681                     // This is a shape, so show connection point(s).
 682     /*                if (!(cc->active_shape)
 683                             // Don't show handle for another handle.
 684     //                         || (cc->connpthandles.find((SPKnot*) item) != cc->connpthandles.end())
 685                         )
 686                     {
 687                         cc_set_active_shape(cc, item);
 688                     }*/
 689                     cc_set_active_shape(cc, item);
 690                 }
 691                 ret = TRUE;
 692             }
 693             break;
 694         }
 695         default:
 696             break;
 697     }
 698
 699     return ret;
 700 }
 701
 702
 703 gint
 704 sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event)
 705 {
 706     SPConnectorContext *const cc = SP_CONNECTOR_CONTEXT(ec);
 707
 708     gint ret = FALSE;
 709
 710     switch (event->type) {
 711         case GDK_BUTTON_PRESS:
 712             ret = connector_handle_button_press(cc, event->button);
 713             break;
 714
 715         case GDK_MOTION_NOTIFY:
 716             ret = connector_handle_motion_notify(cc, event->motion);
 717             break;
 718
 719         case GDK_BUTTON_RELEASE:
 720             ret = connector_handle_button_release(cc, event->button);
 721             break;
 722         case GDK_KEY_PRESS:
 723             ret = connector_handle_key_press(cc, get_group0_keyval (&event->key));
 724             break;
 725
 726         default:
 727             break;
 728     }
 729
 730     if (!ret) {
 731         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 732             = ((SPEventContextClass *) parent_class)->root_handler;
 733         if (parent_root_handler) {
 734             ret = parent_root_handler(ec, event);
 735         }
 736     }
 737
 738     return ret;
 739 }
 740
 741
 742 static gint
 743 connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent)
 744 {
 745     Geom::Point const event_w(bevent.x, bevent.y);
 746     /* Find desktop coordinates */
 747     Geom::Point p = cc->desktop->w2d(event_w);
 748     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 749
 750     gint ret = FALSE;
 751     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
 752     {
 753         if ( bevent.button == 1 && !event_context->space_panning ) {
 754
 755             SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 756
 757             if (Inkscape::have_viable_layer(desktop, cc->_message_context) == false) {
 758                 return TRUE;
 759             }
 760
 761             Geom::Point const event_w(bevent.x,
 762                                     bevent.y);
 763 //             connector_drag_origin_w = event_w;
 764             cc->xp = bevent.x;
 765             cc->yp = bevent.y;
 766             cc->within_tolerance = true;
 767
 768             Geom::Point const event_dt = cc->desktop->w2d(event_w);
 769
 770             SnapManager &m = cc->desktop->namedview->snap_manager;
 771             m.setup(cc->desktop);
 772
 773             switch (cc->state) {
 774                 case SP_CONNECTOR_CONTEXT_STOP:
 775                     /* This is allowed, if we just canceled curve */
 776                 case SP_CONNECTOR_CONTEXT_IDLE:
 777                 {
 778                     if ( cc->npoints == 0 ) {
 779                         cc_clear_active_conn(cc);
 780
 781                         SP_EVENT_CONTEXT_DESKTOP(cc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new connector"));
 782
 783                         /* Set start anchor */
 784                         /* Create green anchor */
 785                         Geom::Point p = event_dt;
 786
 787                         // Test whether we clicked on a connection point
 788                         bool found = conn_pt_handle_test(cc, p, &cc->shref, &cc->scpid);
 789
 790                         if (!found) {
 791                             // This is the first point, so just snap it to the grid
 792                             // as there's no other points to go off.
 793                             m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 794                         }
 795                         spcc_connector_set_initial_point(cc, p);
 796
 797                     }
 798                     cc->state = SP_CONNECTOR_CONTEXT_DRAGGING;
 799                     ret = TRUE;
 800                     break;
 801                 }
 802                 case SP_CONNECTOR_CONTEXT_DRAGGING:
 803                 {
 804                     // This is the second click of a connector creation.
 805                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 806
 807                     spcc_connector_set_subsequent_point(cc, p);
 808                     spcc_connector_finish_segment(cc, p);
 809                     // Test whether we clicked on a connection point
 810                     /*bool found = */conn_pt_handle_test(cc, p, &cc->ehref, &cc->ecpid);
 811                     if (cc->npoints != 0) {
 812                         spcc_connector_finish(cc);
 813                     }
 814                     cc_set_active_conn(cc, cc->newconn);
 815                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 816                     ret = TRUE;
 817                     break;
 818                 }
 819                 case SP_CONNECTOR_CONTEXT_CLOSE:
 820                 {
 821                     g_warning("Button down in CLOSE state");
 822                     break;
 823                 }
 824                 default:
 825                     break;
 826             }
 827             m.unSetup();
 828         } else if (bevent.button == 3) {
 829             if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
 830                 // A context menu is going to be triggered here,
 831                 // so end the rerouting operation.
 832                 cc_connector_rerouting_finish(cc, &p);
 833
 834                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 835
 836                 // Don't set ret to TRUE, so we drop through to the
 837                 // parent handler which will open the context menu.
 838             }
 839             else if (cc->npoints != 0) {
 840                 spcc_connector_finish(cc);
 841                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 842                 ret = TRUE;
 843             }
 844         }
 845     }
 846     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
 847     {
 848         if ( bevent.button == 1 && !event_context->space_panning )
 849         {
 850             // Initialize variables in case of dragging
 851
 852             SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 853
 854             if (Inkscape::have_viable_layer(desktop, cc->_message_context) == false) {
 855                 return TRUE;
 856             }
 857
 858             cc->xp = bevent.x;
 859             cc->yp = bevent.y;
 860             cc->within_tolerance = true;
 861
 862             ConnectionPointMap::iterator const& active_knot_it = cc->connpthandles.find( cc->active_handle );
 863
 864             switch (cc->state)
 865             {
 866                 case SP_CONNECTOR_CONTEXT_IDLE:
 867                     if ( active_knot_it != cc->connpthandles.end() )
 868                     {
 869                         // We do not allow selecting and, thereby, moving default knots
 870                         if ( active_knot_it->second.type != ConnPointDefault)
 871                         {
 872                             if (cc->selected_handle != cc->active_handle)
 873                             {
 874                                 if ( cc->selected_handle )
 875                                     cc_deselect_handle( cc->selected_handle );
 876                                 cc->selected_handle = cc->active_handle;
 877                                 cc_select_handle( cc->selected_handle );
 878                             }
 879                         }
 880                         else
 881                             // Just ignore the default connection point
 882                             return FALSE;
 883                     }
 884                     else
 885                         if ( cc->selected_handle )
 886                         {
 887                             cc_deselect_handle( cc->selected_handle );
 888                             cc->selected_handle = NULL;
 889                         }
 890
 891                     if ( cc->selected_handle )
 892                     {
 893                         cc->state = SP_CONNECTOR_CONTEXT_DRAGGING;
 894                         cc->selection->set( SP_OBJECT( cc->active_shape ) );
 895                     }
 896
 897                     ret = TRUE;
 898                     break;
 899                 // Dragging valid because of the way we create
 900                 // new connection points.
 901                 case SP_CONNECTOR_CONTEXT_DRAGGING:
 902                     // Do nothing.
 903                     ret = TRUE;
 904                     break;
 905             }
 906         }
 907     }
 908     return ret;
 909 }
 910
 911
 912 static gint
 913 connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent)
 914 {
 915     gint ret = FALSE;
 916     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 917     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 918
 919     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 920         // allow middle-button scrolling
 921         return FALSE;
 922     }
 923
 924     Geom::Point const event_w(mevent.x, mevent.y);
 925
 926     if (cc->within_tolerance) {
 927         cc->tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 928         if ( ( abs( (gint) mevent.x - cc->xp ) < cc->tolerance ) &&
 929              ( abs( (gint) mevent.y - cc->yp ) < cc->tolerance ) ) {
 930             return FALSE;   // Do not drag if we're within tolerance from origin.
 931         }
 932     }
 933     // Once the user has moved farther than tolerance from the original location
 934     // (indicating they intend to move the object, not click), then always process
 935     // the motion notify coordinates as given (no snapping back to origin)
 936     cc->within_tolerance = false;
 937
 938     SPDesktop *const dt = cc->desktop;
 939
 940     /* Find desktop coordinates */
 941     Geom::Point p = dt->w2d(event_w);
 942
 943     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
 944     {
 945         SnapManager &m = dt->namedview->snap_manager;
 946         m.setup(dt);
 947
 948         switch (cc->state) {
 949             case SP_CONNECTOR_CONTEXT_DRAGGING:
 950             {
 951                 gobble_motion_events(mevent.state);
 952                 // This is movement during a connector creation.
 953                 if ( cc->npoints > 0 ) {
 954                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 955                     cc->selection->clear();
 956                     spcc_connector_set_subsequent_point(cc, p);
 957                     ret = TRUE;
 958                 }
 959                 break;
 960             }
 961             case SP_CONNECTOR_CONTEXT_REROUTING:
 962             {
 963                 gobble_motion_events(GDK_BUTTON1_MASK);
 964                 g_assert( SP_IS_PATH(cc->clickeditem));
 965
 966                 m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 967
 968                 // Update the hidden path
 969                 Geom::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
 970                 Geom::Matrix d2i = i2d.inverse();
 971                 SPPath *path = SP_PATH(cc->clickeditem);
 972                 SPCurve *curve = path->original_curve ? path->original_curve : path->curve;
 973                 if (cc->clickedhandle == cc->endpt_handle[0]) {
 974                     Geom::Point o = cc->endpt_handle[1]->pos;
 975                     curve->stretch_endpoints(p * d2i, o * d2i);
 976                 }
 977                 else {
 978                     Geom::Point o = cc->endpt_handle[0]->pos;
 979                     curve->stretch_endpoints(o * d2i, p * d2i);
 980                 }
 981                 sp_conn_reroute_path_immediate(path);
 982
 983                 // Copy this to the temporary visible path
 984                 cc->red_curve = path->original_curve ?
 985                         path->original_curve->copy() : path->curve->copy();
 986                 cc->red_curve->transform(i2d);
 987
 988                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 989                 ret = TRUE;
 990                 break;
 991             }
 992             case SP_CONNECTOR_CONTEXT_STOP:
 993                 /* This is perfectly valid */
 994                 break;
 995             default:
 996                 if (!sp_event_context_knot_mouseover(cc)) {
 997                     m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_OTHER_HANDLE));
 998                 }
 999                 break;
1000         }
1001         m.unSetup();
1002     }
1003     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
1004     {
1005         switch ( cc->state )
1006         {
1007             case SP_CONNECTOR_CONTEXT_DRAGGING:
1008                 sp_knot_set_position(cc->selected_handle, p, 0);
1009                 ret = TRUE;
1010                 break;
1011             case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
1012                 sp_knot_set_position(cc->selected_handle, p, 0);
1013                 ret = TRUE;
1014                 break;
1015         }
1016     }
1017
1018     return ret;
1019 }
1020
1021
1022 static gint
1023 connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent)
1024 {
1025     gint ret = FALSE;
1026     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
1027     if ( revent.button == 1 && !event_context->space_panning ) {
1028
1029         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1030         SPDocument *doc = sp_desktop_document(desktop);
1031
1032         SnapManager &m = desktop->namedview->snap_manager;
1033         m.setup(desktop);
1034
1035         Geom::Point const event_w(revent.x, revent.y);
1036
1037         /* Find desktop coordinates */
1038         Geom::Point p = cc->desktop->w2d(event_w);
1039         if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
1040         {
1041             switch (cc->state) {
1042                 //case SP_CONNECTOR_CONTEXT_POINT:
1043                 case SP_CONNECTOR_CONTEXT_DRAGGING:
1044                 {
1045                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1046
1047                     if (cc->within_tolerance)
1048                     {
1049                         spcc_connector_finish_segment(cc, p);
1050                         return TRUE;
1051                     }
1052                     // Connector has been created via a drag, end it now.
1053                     spcc_connector_set_subsequent_point(cc, p);
1054                     spcc_connector_finish_segment(cc, p);
1055                     // Test whether we clicked on a connection point
1056                     /*bool found = */conn_pt_handle_test(cc, p, &cc->ehref, &cc->ecpid);
1057                     if (cc->npoints != 0) {
1058                         spcc_connector_finish(cc);
1059                     }
1060                     cc_set_active_conn(cc, cc->newconn);
1061                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1062                     break;
1063                 }
1064                 case SP_CONNECTOR_CONTEXT_REROUTING:
1065                 {
1066                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1067                     cc_connector_rerouting_finish(cc, &p);
1068
1069                     sp_document_ensure_up_to_date(doc);
1070                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1071                     return TRUE;
1072                     break;
1073                 }
1074                 case SP_CONNECTOR_CONTEXT_STOP:
1075                     /* This is allowed, if we just cancelled curve */
1076                     break;
1077                 default:
1078                     break;
1079             }
1080             ret = TRUE;
1081         }
1082         else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
1083         {
1084             switch ( cc->state )
1085             {
1086                 case SP_CONNECTOR_CONTEXT_DRAGGING:
1087
1088                     if (!cc->within_tolerance)
1089                     {
1090                         m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1091                         sp_knot_set_position(cc->selected_handle, p, 0);
1092                         ConnectionPoint& cp = cc->connpthandles[cc->selected_handle];
1093                         cp.pos = p * sp_item_dt2i_affine(cc->active_shape);
1094                         cc->active_shape->avoidRef->updateConnectionPoint(cp);
1095                     }
1096
1097                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1098                     ret = TRUE;
1099                     break;
1100
1101
1102                 case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
1103                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1104
1105                     sp_knot_set_position(cc->selected_handle, p, 0);
1106
1107                     ConnectionPoint cp;
1108                     cp.type = ConnPointUserDefined;
1109                     cp.pos = p * sp_item_dt2i_affine(cc->active_shape);
1110                     cp.dir = Avoid::ConnDirAll;
1111                     g_object_unref(cc->selected_handle);
1112                     cc->active_shape->avoidRef->addConnectionPoint(cp);
1113                     sp_document_ensure_up_to_date(doc);
1114                     for (ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end(); ++it)
1115                         if (it->second.type == ConnPointUserDefined && it->second.id == cp.id)
1116                         {
1117                             cc->selected_handle = it->first;
1118                             break;
1119                         }
1120                     cc_select_handle( cc->selected_handle );
1121                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1122                     ret = TRUE;
1123                     break;
1124             }
1125         }
1126         m.unSetup();
1127     }
1128
1129
1130     return ret;
1131 }
1132
1133
1134 static gint
1135 connector_handle_key_press(SPConnectorContext *const cc, guint const keyval)
1136 {
1137     gint ret = FALSE;
1138     /* fixme: */
1139     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
1140     {
1141         switch (keyval) {
1142             case GDK_Return:
1143             case GDK_KP_Enter:
1144                 if (cc->npoints != 0) {
1145                     spcc_connector_finish(cc);
1146                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1147                     ret = TRUE;
1148                 }
1149                 break;
1150             case GDK_Escape:
1151                 if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
1152
1153                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1154                     SPDocument *doc = sp_desktop_document(desktop);
1155
1156                     cc_connector_rerouting_finish(cc, NULL);
1157
1158                     sp_document_undo(doc);
1159
1160                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1161                     desktop->messageStack()->flash( Inkscape::NORMAL_MESSAGE,
1162                             _("Connector endpoint drag cancelled."));
1163                     ret = TRUE;
1164                 }
1165                 else if (cc->npoints != 0) {
1166                     // if drawing, cancel, otherwise pass it up for deselecting
1167                     cc->state = SP_CONNECTOR_CONTEXT_STOP;
1168                     spcc_reset_colors(cc);
1169                     ret = TRUE;
1170                 }
1171                 break;
1172             default:
1173                 break;
1174         }
1175     }
1176     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
1177     {
1178         switch ( cc->state )
1179         {
1180             case SP_CONNECTOR_CONTEXT_DRAGGING:
1181                 if ( keyval == GDK_Escape )
1182                 {
1183                     // Cancel connection point dragging
1184
1185                     // Obtain original position
1186                     ConnectionPoint const& cp = cc->connpthandles[cc->selected_handle];
1187                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1188                     const Geom::Matrix& i2doc = sp_item_i2doc_affine(cc->active_shape);
1189                     sp_knot_set_position(cc->selected_handle, cp.pos * i2doc * desktop->doc2dt(), 0);
1190                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1191                     desktop->messageStack()->flash( Inkscape::NORMAL_MESSAGE,
1192                         _("Connection point drag cancelled."));
1193                     ret = TRUE;
1194                 }
1195                 else if ( keyval == GDK_Return || keyval == GDK_KP_Enter )
1196                 {
1197                     // Put connection point at current position
1198
1199                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1200                     SnapManager &m = desktop->namedview->snap_manager;
1201                     m.setup(desktop);
1202                     Geom::Point p = cc->selected_handle->pos;
1203 //                     SPEventContext* event_context = SP_EVENT_CONTEXT( cc );
1204
1205                     if (!cc->within_tolerance)
1206                     {
1207                         m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1208                         sp_knot_set_position(cc->selected_handle, p, 0);
1209                         ConnectionPoint& cp = cc->connpthandles[cc->selected_handle];
1210                         cp.pos = p * sp_item_dt2i_affine(cc->active_shape);
1211                         cc->active_shape->avoidRef->updateConnectionPoint(cp);
1212                     }
1213                     m.unSetup();
1214
1215                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1216                     ret = TRUE;
1217                 }
1218                 break;
1219             case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
1220                 if ( keyval == GDK_Escape )
1221                 {
1222                     // Just destroy the knot
1223                     g_object_unref( cc->selected_handle );
1224                     cc->selected_handle = NULL;
1225                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1226                     ret = TRUE;
1227                 }
1228                 else if ( keyval == GDK_Return || keyval == GDK_KP_Enter )
1229                 {
1230                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1231                     SPDocument *doc = sp_desktop_document(desktop);
1232                     SnapManager &m = desktop->namedview->snap_manager;
1233                     m.setup(desktop);
1234                     Geom::Point p = cc->selected_handle->pos;
1235
1236                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1237                     m.unSetup();
1238                     sp_knot_set_position(cc->selected_handle, p, 0);
1239
1240                     ConnectionPoint cp;
1241                     cp.type = ConnPointUserDefined;
1242                     cp.pos = p * sp_item_dt2i_affine(cc->active_shape);
1243                     cp.dir = Avoid::ConnDirAll;
1244                     g_object_unref(cc->selected_handle);
1245                     cc->active_shape->avoidRef->addConnectionPoint(cp);
1246                     sp_document_ensure_up_to_date(doc);
1247                     for (ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end(); ++it)
1248                         if (it->second.type == ConnPointUserDefined && it->second.id == cp.id)
1249                         {
1250                             cc->selected_handle = it->first;
1251                             break;
1252                         }
1253                     cc_select_handle( cc->selected_handle );
1254                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1255                     ret = TRUE;
1256                 }
1257
1258                 break;
1259             case SP_CONNECTOR_CONTEXT_IDLE:
1260                 if ( keyval == GDK_Delete && cc->selected_handle )
1261                 {
1262                     cc->active_shape->avoidRef->deleteConnectionPoint(cc->connpthandles[cc->selected_handle]);
1263                     cc->selected_handle = NULL;
1264                     ret = TRUE;
1265                 }
1266
1267                 break;
1268         }
1269     }
1270
1271     return ret;
1272 }
1273
1274
1275 static void
1276 cc_connector_rerouting_finish(SPConnectorContext *const cc, Geom::Point *const p)
1277 {
1278     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1279     SPDocument *doc = sp_desktop_document(desktop);
1280
1281     // Clear the temporary path:
1282     cc->red_curve->reset();
1283     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1284
1285     if (p != NULL)
1286     {
1287         // Test whether we clicked on a connection point
1288         gchar *shape_label, *cpid;
1289         bool found = conn_pt_handle_test(cc, *p, &shape_label, &cpid);
1290
1291         if (found) {
1292             if (cc->clickedhandle == cc->endpt_handle[0]) {
1293                 sp_object_setAttribute(cc->clickeditem,
1294                         "inkscape:connection-start", shape_label, false);
1295                 sp_object_setAttribute(cc->clickeditem,
1296                         "inkscape:connection-start-point", cpid, false);
1297             }
1298             else {
1299                 sp_object_setAttribute(cc->clickeditem,
1300                         "inkscape:connection-end", shape_label, false);
1301                 sp_object_setAttribute(cc->clickeditem,
1302                         "inkscape:connection-end-point", cpid, false);
1303             }
1304             g_free(shape_label);
1305         }
1306     }
1307     cc->clickeditem->setHidden(false);
1308     sp_conn_reroute_path_immediate(SP_PATH(cc->clickeditem));
1309     cc->clickeditem->updateRepr();
1310     sp_document_done(doc, SP_VERB_CONTEXT_CONNECTOR,
1311                      _("Reroute connector"));
1312     cc_set_active_conn(cc, cc->clickeditem);
1313 }
1314
1315
1316 static void
1317 spcc_reset_colors(SPConnectorContext *cc)
1318 {
1319     /* Red */
1320     cc->red_curve->reset();
1321     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1322
1323     cc->green_curve->reset();
1324     cc->npoints = 0;
1325 }
1326
1327
1328 static void
1329 spcc_connector_set_initial_point(SPConnectorContext *const cc, Geom::Point const p)
1330 {
1331     g_assert( cc->npoints == 0 );
1332
1333     cc->p[0] = p;
1334     cc->p[1] = p;
1335     cc->npoints = 2;
1336     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1337 }
1338
1339
1340 static void
1341 spcc_connector_set_subsequent_point(SPConnectorContext *const cc, Geom::Point const p)
1342 {
1343     g_assert( cc->npoints != 0 );
1344
1345     SPDesktop *dt = cc->desktop;
1346     Geom::Point o = dt->dt2doc(cc->p[0]);
1347     Geom::Point d = dt->dt2doc(p);
1348     Avoid::Point src(o[Geom::X], o[Geom::Y]);
1349     Avoid::Point dst(d[Geom::X], d[Geom::Y]);
1350
1351     if (!cc->newConnRef) {
1352         Avoid::Router *router = sp_desktop_document(dt)->router;
1353         cc->newConnRef = new Avoid::ConnRef(router);
1354         cc->newConnRef->setEndpoint(Avoid::VertID::src, src);
1355         if (cc->isOrthogonal)
1356             cc->newConnRef->setRoutingType(Avoid::ConnType_Orthogonal);
1357         else
1358             cc->newConnRef->setRoutingType(Avoid::ConnType_PolyLine);
1359     }
1360     // Set new endpoint.
1361     cc->newConnRef->setEndpoint(Avoid::VertID::tar, dst);
1362     // Immediately generate new routes for connector.
1363     cc->newConnRef->makePathInvalid();
1364     cc->newConnRef->router()->processTransaction();
1365     // Recreate curve from libavoid route.
1366     recreateCurve( cc->red_curve, cc->newConnRef, cc->curvature );
1367     cc->red_curve->transform(dt->doc2dt());
1368     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
1369 }
1370
1371
1372 /**
1373  * Concats red, blue and green.
1374  * If any anchors are defined, process these, optionally removing curves from white list
1375  * Invoke _flush_white to write result back to object.
1376  */
1377 static void
1378 spcc_concat_colors_and_flush(SPConnectorContext *cc)
1379 {
1380     SPCurve *c = cc->green_curve;
1381     cc->green_curve = new SPCurve();
1382
1383     cc->red_curve->reset();
1384     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1385
1386     if (c->is_empty()) {
1387         c->unref();
1388         return;
1389     }
1390
1391     spcc_flush_white(cc, c);
1392
1393     c->unref();
1394 }
1395
1396
1397 /*
1398  * Flushes white curve(s) and additional curve into object
1399  *
1400  * No cleaning of colored curves - this has to be done by caller
1401  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
1402  *
1403  */
1404
1405 static void
1406 spcc_flush_white(SPConnectorContext *cc, SPCurve *gc)
1407 {
1408     SPCurve *c;
1409
1410     if (gc) {
1411         c = gc;
1412         c->ref();
1413     } else {
1414         return;
1415     }
1416
1417     /* Now we have to go back to item coordinates at last */
1418     c->transform(SP_EVENT_CONTEXT_DESKTOP(cc)->dt2doc());
1419
1420     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1421     SPDocument *doc = sp_desktop_document(desktop);
1422     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
1423
1424     if ( c && !c->is_empty() ) {
1425         /* We actually have something to write */
1426
1427         Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
1428         /* Set style */
1429         sp_desktop_apply_style_tool(desktop, repr, "/tools/connector", false);
1430
1431         gchar *str = sp_svg_write_path( c->get_pathvector() );
1432         g_assert( str != NULL );
1433         repr->setAttribute("d", str);
1434         g_free(str);
1435
1436         /* Attach repr */
1437         cc->newconn = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
1438         cc->newconn->transform = sp_item_i2doc_affine(SP_ITEM(desktop->currentLayer())).inverse();
1439
1440         bool connection = false;
1441         sp_object_setAttribute(cc->newconn, "inkscape:connector-type",
1442                 cc->isOrthogonal ? "orthogonal" : "polyline", false);
1443         sp_object_setAttribute(cc->newconn, "inkscape:connector-curvature",
1444                 Glib::Ascii::dtostr(cc->curvature).c_str(), false);
1445         if (cc->shref)
1446         {
1447             sp_object_setAttribute(cc->newconn, "inkscape:connection-start",
1448                     cc->shref, false);
1449             if (cc->scpid)
1450                 sp_object_setAttribute(cc->newconn, "inkscape:connection-start-point",
1451                         cc->scpid, false);
1452             connection = true;
1453         }
1454
1455         if (cc->ehref)
1456         {
1457             sp_object_setAttribute(cc->newconn, "inkscape:connection-end",
1458                     cc->ehref, false);
1459             if (cc->ecpid)
1460                 sp_object_setAttribute(cc->newconn, "inkscape:connection-end-point",
1461                         cc->ecpid, false);
1462             connection = true;
1463         }
1464         // Process pending updates.
1465         cc->newconn->updateRepr();
1466         sp_document_ensure_up_to_date(doc);
1467
1468         if (connection) {
1469             // Adjust endpoints to shape edge.
1470             sp_conn_reroute_path_immediate(SP_PATH(cc->newconn));
1471             cc->newconn->updateRepr();
1472         }
1473
1474         // Only set the selection after we are finished with creating the attributes of
1475         // the connector.  Otherwise, the selection change may alter the defaults for
1476         // values like curvature in the connector context, preventing subsequent lookup
1477         // of their original values.
1478         cc->selection->set(repr);
1479         Inkscape::GC::release(repr);
1480     }
1481
1482     c->unref();
1483
1484     sp_document_done(doc, SP_VERB_CONTEXT_CONNECTOR, _("Create connector"));
1485 }
1486
1487
1488 static void
1489 spcc_connector_finish_segment(SPConnectorContext *const cc, Geom::Point const /*p*/)
1490 {
1491     if (!cc->red_curve->is_empty()) {
1492         cc->green_curve->append_continuous(cc->red_curve, 0.0625);
1493
1494         cc->p[0] = cc->p[3];
1495         cc->p[1] = cc->p[4];
1496         cc->npoints = 2;
1497
1498         cc->red_curve->reset();
1499     }
1500 }
1501
1502
1503 static void
1504 spcc_connector_finish(SPConnectorContext *const cc)
1505 {
1506     SPDesktop *const desktop = cc->desktop;
1507     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Finishing connector"));
1508
1509     cc->red_curve->reset();
1510     spcc_concat_colors_and_flush(cc);
1511
1512     cc->npoints = 0;
1513
1514     if (cc->newConnRef) {
1515         cc->newConnRef->removeFromGraph();
1516         delete cc->newConnRef;
1517         cc->newConnRef = NULL;
1518     }
1519 }
1520
1521
1522 static gboolean
1523 cc_generic_knot_handler(SPCanvasItem *, GdkEvent *event, SPKnot *knot)
1524 {
1525     g_assert (knot != NULL);
1526
1527     g_object_ref(knot);
1528
1529     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(
1530             knot->desktop->event_context);
1531
1532     gboolean consumed = FALSE;
1533
1534     gchar* knot_tip = knot->tip ? knot->tip : cc->knot_tip;
1535     switch (event->type) {
1536         case GDK_ENTER_NOTIFY:
1537             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, TRUE);
1538
1539             cc->active_handle = knot;
1540             if (knot_tip)
1541             {
1542                 knot->desktop->event_context->defaultMessageContext()->set(
1543                         Inkscape::NORMAL_MESSAGE, knot_tip);
1544             }
1545
1546             consumed = TRUE;
1547             break;
1548         case GDK_LEAVE_NOTIFY:
1549             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, FALSE);
1550
1551             cc->active_handle = NULL;
1552
1553             if (knot_tip) {
1554                 knot->desktop->event_context->defaultMessageContext()->clear();
1555             }
1556
1557             consumed = TRUE;
1558             break;
1559         default:
1560             break;
1561     }
1562
1563     g_object_unref(knot);
1564
1565     return consumed;
1566 }
1567
1568
1569 static gboolean
1570 endpt_handler(SPKnot */*knot*/, GdkEvent *event, SPConnectorContext *cc)
1571 {
1572     g_assert( SP_IS_CONNECTOR_CONTEXT(cc) );
1573
1574     gboolean consumed = FALSE;
1575
1576     switch (event->type) {
1577         case GDK_BUTTON_PRESS:
1578             g_assert( (cc->active_handle == cc->endpt_handle[0]) ||
1579                       (cc->active_handle == cc->endpt_handle[1]) );
1580             if (cc->state == SP_CONNECTOR_CONTEXT_IDLE) {
1581                 cc->clickeditem = cc->active_conn;
1582                 cc->clickedhandle = cc->active_handle;
1583                 cc_clear_active_conn(cc);
1584                 cc->state = SP_CONNECTOR_CONTEXT_REROUTING;
1585
1586                 // Disconnect from attached shape
1587                 unsigned ind = (cc->active_handle == cc->endpt_handle[0]) ? 0 : 1;
1588                 sp_conn_end_detach(cc->clickeditem, ind);
1589
1590                 Geom::Point origin;
1591                 if (cc->clickedhandle == cc->endpt_handle[0]) {
1592                     origin = cc->endpt_handle[1]->pos;
1593                 }
1594                 else {
1595                     origin = cc->endpt_handle[0]->pos;
1596                 }
1597
1598                 // Show the red path for dragging.
1599                 cc->red_curve = SP_PATH(cc->clickeditem)->original_curve ? SP_PATH(cc->clickeditem)->original_curve->copy() : SP_PATH(cc->clickeditem)->curve->copy();
1600                 Geom::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
1601                 cc->red_curve->transform(i2d);
1602                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
1603
1604                 cc->clickeditem->setHidden(true);
1605
1606                 // The rest of the interaction rerouting the connector is
1607                 // handled by the context root handler.
1608                 consumed = TRUE;
1609             }
1610             break;
1611         default:
1612             break;
1613     }
1614
1615     return consumed;
1616 }
1617
1618 static void cc_active_shape_add_knot(SPDesktop* desktop, SPItem* item, ConnectionPointMap &cphandles, ConnectionPoint& cp)
1619 {
1620         SPKnot *knot = sp_knot_new(desktop, 0);
1621
1622         knot->setShape(SP_KNOT_SHAPE_SQUARE);
1623         knot->setSize(8);
1624         knot->setAnchor(GTK_ANCHOR_CENTER);
1625         knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1626         sp_knot_update_ctrl(knot);
1627
1628         // We don't want to use the standard knot handler.
1629         g_signal_handler_disconnect(G_OBJECT(knot->item),
1630                 knot->_event_handler_id);
1631         knot->_event_handler_id = 0;
1632
1633         gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1634                 GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1635         sp_knot_set_position(knot, item->avoidRef->getConnectionPointPos(cp.type, cp.id) * desktop->doc2dt(), 0);
1636         sp_knot_show(knot);
1637         cphandles[knot] = cp;
1638 }
1639
1640 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item)
1641 {
1642     g_assert(item != NULL );
1643
1644     std::map<int, ConnectionPoint>* connpts = &item->avoidRef->connection_points;
1645
1646     if (cc->active_shape != item)
1647     {
1648         // The active shape has changed
1649         // Rebuild everything
1650         cc->active_shape = item;
1651         // Remove existing active shape listeners
1652         if (cc->active_shape_repr) {
1653             sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
1654             Inkscape::GC::release(cc->active_shape_repr);
1655
1656             sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
1657             Inkscape::GC::release(cc->active_shape_layer_repr);
1658         }
1659
1660         // Listen in case the active shape changes
1661         cc->active_shape_repr = SP_OBJECT_REPR(item);
1662         if (cc->active_shape_repr) {
1663             Inkscape::GC::anchor(cc->active_shape_repr);
1664             sp_repr_add_listener(cc->active_shape_repr, &shape_repr_events, cc);
1665
1666             cc->active_shape_layer_repr = cc->active_shape_repr->parent();
1667             Inkscape::GC::anchor(cc->active_shape_layer_repr);
1668             sp_repr_add_listener(cc->active_shape_layer_repr, &layer_repr_events, cc);
1669         }
1670
1671
1672         // Set the connection points.
1673         if ( cc->connpthandles.size() )
1674             // destroy the old list
1675             while (! cc->connpthandles.empty() )
1676             {
1677                 g_object_unref(cc->connpthandles.begin()->first);
1678                 cc->connpthandles.erase(cc->connpthandles.begin());
1679             }
1680         // build the new one
1681         if ( connpts->size() )
1682         for (std::map<int, ConnectionPoint>::iterator it = connpts->begin(); it != connpts->end(); ++it)
1683             cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, it->second);
1684
1685         // Also add default connection points
1686         // For now, only centre default connection point will
1687         // be available
1688         ConnectionPoint centre;
1689         centre.type = ConnPointDefault;
1690         centre.id = ConnPointPosCC;
1691         cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, centre);
1692     }
1693     else
1694     {
1695         // The active shape didn't change
1696         // Update only the connection point knots
1697
1698         // Ensure the item's connection_points map
1699         // has been updated
1700         sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
1701
1702         std::set<int> seen;
1703         for  ( ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end() ;)
1704         {
1705             bool removed = false;
1706             if ( it->second.type == ConnPointUserDefined )
1707             {
1708                 std::map<int, ConnectionPoint>::iterator p = connpts->find(it->second.id);
1709                 if (p != connpts->end())
1710                 {
1711                     if ( it->second != p->second )
1712                         // Connection point position has changed
1713                         // Update knot position
1714                         sp_knot_set_position(it->first,
1715                                              item->avoidRef->getConnectionPointPos(it->second.type, it->second.id) * cc->desktop->doc2dt(), 0);
1716                     seen.insert(it->second.id);
1717                     sp_knot_show(it->first);
1718                 }
1719                 else
1720                 {
1721                     // This connection point does no longer exist,
1722                     // remove the knot
1723                     ConnectionPointMap::iterator curr = it;
1724                     ++it;
1725                     g_object_unref( curr->first );
1726                     cc->connpthandles.erase(curr);
1727                     removed = true;
1728                 }
1729             }
1730             else
1731             {
1732                 // It's a default connection point
1733                 // Just make sure it's position is correct
1734                 sp_knot_set_position(it->first,
1735                                      item->avoidRef->getConnectionPointPos(it->second.type, it->second.id) * cc->desktop->doc2dt(), 0);
1736                 sp_knot_show(it->first);
1737
1738             }
1739             if ( !removed )
1740                 ++it;
1741         }
1742         // Add knots for new connection points.
1743         if (connpts->size())
1744             for ( std::map<int, ConnectionPoint>::iterator it = connpts->begin(); it != connpts->end(); ++it )
1745                 if ( seen.find(it->first) == seen.end() )
1746                     // A new connection point has been added
1747                     // to the shape. Add a knot for it.
1748                     cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, it->second);
1749     }
1750 }
1751
1752
1753 static void
1754 cc_set_active_conn(SPConnectorContext *cc, SPItem *item)
1755 {
1756     g_assert( SP_IS_PATH(item) );
1757
1758     SPCurve *curve = SP_PATH(item)->original_curve ? SP_PATH(item)->original_curve : SP_PATH(item)->curve;
1759     Geom::Matrix i2d = sp_item_i2d_affine(item);
1760
1761     if (cc->active_conn == item)
1762     {
1763         if (curve->is_empty())
1764         {
1765             // Connector is invisible because it is clipped to the boundary of
1766             // two overlpapping shapes.
1767             sp_knot_hide(cc->endpt_handle[0]);
1768             sp_knot_hide(cc->endpt_handle[1]);
1769         }
1770         else
1771         {
1772             // Just adjust handle positions.
1773             Geom::Point startpt = *(curve->first_point()) * i2d;
1774             sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1775
1776             Geom::Point endpt = *(curve->last_point()) * i2d;
1777             sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1778         }
1779
1780         return;
1781     }
1782
1783     cc->active_conn = item;
1784
1785     // Remove existing active conn listeners
1786     if (cc->active_conn_repr) {
1787         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
1788         Inkscape::GC::release(cc->active_conn_repr);
1789         cc->active_conn_repr = NULL;
1790     }
1791
1792     // Listen in case the active conn changes
1793     cc->active_conn_repr = SP_OBJECT_REPR(item);
1794     if (cc->active_conn_repr) {
1795         Inkscape::GC::anchor(cc->active_conn_repr);
1796         sp_repr_add_listener(cc->active_conn_repr, &shape_repr_events, cc);
1797     }
1798
1799     for (int i = 0; i < 2; ++i) {
1800
1801         // Create the handle if it doesn't exist
1802         if ( cc->endpt_handle[i] == NULL ) {
1803             SPKnot *knot = sp_knot_new(cc->desktop,
1804                     _("<b>Connector endpoint</b>: drag to reroute or connect to new shapes"));
1805
1806             knot->setShape(SP_KNOT_SHAPE_SQUARE);
1807             knot->setSize(7);
1808             knot->setAnchor(GTK_ANCHOR_CENTER);
1809             knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1810             knot->setStroke(0x000000ff, 0x000000ff, 0x000000ff);
1811             sp_knot_update_ctrl(knot);
1812
1813             // We don't want to use the standard knot handler,
1814             // since we don't want this knot to be draggable.
1815             g_signal_handler_disconnect(G_OBJECT(knot->item),
1816                     knot->_event_handler_id);
1817             knot->_event_handler_id = 0;
1818
1819             gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1820                     GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1821
1822             cc->endpt_handle[i] = knot;
1823         }
1824
1825         // Remove any existing handlers
1826         if (cc->endpt_handler_id[i]) {
1827             g_signal_handlers_disconnect_by_func(
1828                     G_OBJECT(cc->endpt_handle[i]->item),
1829                     (void*)G_CALLBACK(endpt_handler), (gpointer) cc );
1830             cc->endpt_handler_id[i] = 0;
1831         }
1832
1833         // Setup handlers for connector endpoints, this is
1834         // is as 'after' so that cc_generic_knot_handler is
1835         // triggered first for any endpoint.
1836         cc->endpt_handler_id[i] = g_signal_connect_after(
1837                 G_OBJECT(cc->endpt_handle[i]->item), "event",
1838                 G_CALLBACK(endpt_handler), cc);
1839     }
1840
1841     if (curve->is_empty())
1842     {
1843         // Connector is invisible because it is clipped to the boundary
1844         // of two overlpapping shapes.  So, it doesn't need endpoints.
1845         return;
1846     }
1847
1848     Geom::Point startpt = *(curve->first_point()) * i2d;
1849     sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1850
1851     Geom::Point endpt = *(curve->last_point()) * i2d;
1852     sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1853
1854     sp_knot_show(cc->endpt_handle[0]);
1855     sp_knot_show(cc->endpt_handle[1]);
1856 }
1857
1858 void cc_create_connection_point(SPConnectorContext* cc)
1859 {
1860     if (cc->active_shape && cc->state == SP_CONNECTOR_CONTEXT_IDLE)
1861     {
1862         if (cc->selected_handle)
1863         {
1864             cc_deselect_handle( cc->selected_handle );
1865         }
1866         SPKnot *knot = sp_knot_new(cc->desktop, 0);
1867         // We do not process events on this knot.
1868         g_signal_handler_disconnect(G_OBJECT(knot->item),
1869                                     knot->_event_handler_id);
1870         knot->_event_handler_id = 0;
1871
1872         cc_select_handle( knot );
1873         cc->selected_handle = knot;
1874         sp_knot_show(cc->selected_handle);
1875         cc->state = SP_CONNECTOR_CONTEXT_NEWCONNPOINT;
1876     }
1877 }
1878
1879 void cc_remove_connection_point(SPConnectorContext* cc)
1880 {
1881     if (cc->selected_handle && cc->state == SP_CONNECTOR_CONTEXT_IDLE )
1882     {
1883         cc->active_shape->avoidRef->deleteConnectionPoint(cc->connpthandles[cc->selected_handle]);
1884         cc->selected_handle = NULL;
1885     }
1886 }
1887
1888 static bool cc_item_is_shape(SPItem *item)
1889 {
1890     if (SP_IS_PATH(item)) {
1891         SPCurve *curve = (SP_SHAPE(item))->curve;
1892         if ( curve && !(curve->is_closed()) ) {
1893             // Open paths are connectors.
1894             return false;
1895         }
1896     }
1897     else if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
1898         Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1899         if (prefs->getBool("/tools/connector/ignoretext", true)) {
1900             // Don't count text as a shape we can connect connector to.
1901             return false;
1902         }
1903     }
1904     return true;
1905 }
1906
1907
1908 bool cc_item_is_connector(SPItem *item)
1909 {
1910     if (SP_IS_PATH(item)) {
1911         if (SP_PATH(item)->connEndPair.isAutoRoutingConn()) {
1912             g_assert( SP_PATH(item)->original_curve ? !(SP_PATH(item)->original_curve->is_closed()) : !(SP_PATH(item)->curve->is_closed()) );
1913             return true;
1914         }
1915     }
1916     return false;
1917 }
1918
1919
1920 void cc_selection_set_avoid(bool const set_avoid)
1921 {
1922     SPDesktop *desktop = inkscape_active_desktop();
1923     if (desktop == NULL) {
1924         return;
1925     }
1926
1927     SPDocument *document = sp_desktop_document(desktop);
1928
1929     Inkscape::Selection *selection = sp_desktop_selection(desktop);
1930
1931     GSList *l = (GSList *) selection->itemList();
1932
1933     int changes = 0;
1934
1935     while (l) {
1936         SPItem *item = (SPItem *) l->data;
1937
1938         char const *value = (set_avoid) ? "true" : NULL;
1939
1940         if (cc_item_is_shape(item)) {
1941             sp_object_setAttribute(item, "inkscape:connector-avoid",
1942                     value, false);
1943             item->avoidRef->handleSettingChange();
1944             changes++;
1945         }
1946
1947         l = l->next;
1948     }
1949
1950     if (changes == 0) {
1951         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE,
1952                 _("Select <b>at least one non-connector object</b>."));
1953         return;
1954     }
1955
1956     char *event_desc = (set_avoid) ?
1957             _("Make connectors avoid selected objects") :
1958             _("Make connectors ignore selected objects");
1959     sp_document_done(document, SP_VERB_CONTEXT_CONNECTOR, event_desc);
1960 }
1961
1962
1963 static void
1964 cc_selection_changed(Inkscape::Selection *selection, gpointer data)
1965 {
1966     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1967     //SPEventContext *ec = SP_EVENT_CONTEXT(cc);
1968
1969     SPItem *item = selection->singleItem();
1970
1971     if (cc->active_conn == item)
1972     {
1973         // Nothing to change.
1974         return;
1975     }
1976     if (item == NULL)
1977     {
1978         cc_clear_active_conn(cc);
1979         return;
1980     }
1981
1982     if (cc_item_is_connector(item)) {
1983         cc_set_active_conn(cc, item);
1984     }
1985 }
1986
1987
1988 static void
1989 shape_event_attr_deleted(Inkscape::XML::Node */*repr*/, Inkscape::XML::Node *child,
1990                          Inkscape::XML::Node */*ref*/, gpointer data)
1991 {
1992     g_assert(data);
1993     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1994
1995     if (child == cc->active_shape_repr) {
1996         // The active shape has been deleted.  Clear active shape.
1997         cc_clear_active_shape(cc);
1998     }
1999 }
2000
2001
2002 static void
2003 shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
2004                          gchar const */*old_value*/, gchar const */*new_value*/,
2005                          bool /*is_interactive*/, gpointer data)
2006 {
2007     g_assert(data);
2008     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
2009
2010     // Look for changes that result in onscreen movement.
2011     if (!strcmp(name, "d") || !strcmp(name, "x") || !strcmp(name, "y") ||
2012             !strcmp(name, "width") || !strcmp(name, "height") ||
2013             !strcmp(name, "transform"))
2014     {
2015         if (repr == cc->active_shape_repr) {
2016             // Active shape has moved. Clear active shape.
2017             cc_clear_active_shape(cc);
2018         }
2019         else if (repr == cc->active_conn_repr) {
2020             // The active conn has been moved.
2021             // Set it again, which just sets new handle positions.
2022             cc_set_active_conn(cc, cc->active_conn);
2023         }
2024     }
2025     else
2026         if ( !strcmp(name, "inkscape:connection-points") )
2027             if (repr == cc->active_shape_repr)
2028                 // The connection points of the active shape
2029                 // have changed. Update them.
2030                 cc_set_active_shape(cc, cc->active_shape);
2031 }
2032
2033
2034 /*
2035   Local Variables:
2036   mode:c++
2037   c-file-style:"stroustrup"
2038   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
2039   indent-tabs-mode:nil
2040   fill-column:99
2041   End:
2042 */
2043 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :