src/connector-context.cpp

   1 /*
   2  * Connector creation tool
   3  *
   4  * Authors:
   5  *   Michael Wybrow <mjwybrow@users.sourceforge.net>
   6  *   Abhishek Sharma
   7  *
   8  * Copyright (C) 2005-2008  Michael Wybrow
   9  * Copyright (C) 2009  Monash University
  10  *
  11  * Released under GNU GPL, read the file 'COPYING' for more information
  12  *
  13  * TODO:
  14  *  o  Show a visual indicator for objects with the 'avoid' property set.
  15  *  o  Allow user to change a object between a path and connector through
  16  *     the interface.
  17  *  o  Create an interface for setting markers (arrow heads).
  18  *  o  Better distinguish between paths and connectors to prevent problems
  19  *     in the node tool and paths accidentally being turned into connectors
  20  *     in the connector tool.  Perhaps have a way to convert between.
  21  *  o  Only call libavoid's updateEndPoint as required.  Currently we do it
  22  *     for both endpoints, even if only one is moving.
  23  *  o  Allow user-placeable connection points.
  24  *  o  Deal sanely with connectors with both endpoints attached to the
  25  *     same connection point, and drawing of connectors attaching
  26  *     overlapping shapes (currently tries to adjust connector to be
  27  *     outside both bounding boxes).
  28  *  o  Fix many special cases related to connectors updating,
  29  *     e.g., copying a couple of shapes and a connector that are
  30  *           attached to each other.
  31  *     e.g., detach connector when it is moved or transformed in
  32  *           one of the other contexts.
  33  *  o  Cope with shapes whose ids change when they have attached
  34  *     connectors.
  35  *  o  During dragging motion, gobble up to and use the final motion event.
  36  *     Gobbling away all duplicates after the current can occasionally result
  37  *     in the path lagging behind the mouse cursor if it is no longer being
  38  *     dragged.
  39  *  o  Fix up libavoid's representation after undo actions.  It doesn't see
  40  *     any transform signals and hence doesn't know shapes have moved back to
  41  *     there earlier positions.
  42  *  o  Decide whether drawing/editing mode should be an Inkscape preference
  43  *     or the connector tool should always start in drawing mode.
  44  *  o  Correct the problem with switching to the select tool when pressing
  45  *     space bar (there are moments when it refuses to do so).
  46  *
  47  * ----------------------------------------------------------------------------
  48  *
  49  * mjwybrow's observations on acracan's Summer of Code connector work:
  50  *
  51  *  -  GUI comments:
  52  *
  53  *      -  Buttons for adding and removing user-specified connection
  54  *      points should probably have "+" and "-" symbols on them so they
  55  *      are consistent with the similar buttons for the node tool.
  56  *      -  Controls on the connector tool be should be reordered logically,
  57  *      possibly as follows:
  58  *
  59  *      *Connector*: [Polyline-radio-button] [Orthgonal-radio-button]
  60  *        [Curvature-control] | *Shape*: [Avoid-button] [Dont-avoid-button]
  61  *        [Spacing-control] | *Connection pts*: [Edit-mode] [Add-pt] [Rm-pt]
  62  *
  63  *      I think that the network layout controls be moved to the
  64  *      Align and Distribute dialog (there is already the layout button
  65  *      there, but no options are exposed).
  66  *
  67  *      I think that the style change between polyline and orthogonal
  68  *      would be much clearer with two buttons (radio behaviour -- just
  69  *      one is true).
  70  *
  71  *      The other tools show a label change from "New:" to "Change:"
  72  *      depending on whether an object is selected.  We could consider
  73  *      this but there may not be space.
  74  *
  75  *      The Add-pt and Rm-pt buttons should be greyed out (inactive) if
  76  *      we are not in connection point editing mode.  And probably also
  77  *      if there is no shape selected, i.e. at the times they have no
  78  *      effect when clicked.
  79  *
  80  *      Likewise for the avoid/ignore shapes buttons.  These should be
  81  *      inactive when a shape is not selected in the connector context.
  82  *
  83  *  -  When creating/editing connection points:
  84  *
  85  *      -  Strange things can happen if you have connectors selected, or
  86  *      try rerouting connectors by dragging their endpoints when in
  87  *      connection point editing mode.
  88  *
  89  *      -  Possibly the selected shape's connection points should always
  90  *      be shown (i.e., have knots) when in editing mode.
  91  *
  92  *      -  It is a little strange to be able to place connection points
  93  *      competely outside shapes.  Especially when you later can't draw
  94  *      connectors to them since the knots are only visible when you
  95  *      are over the shape.  I think that you should only be able to
  96  *      place connection points inside or on the boundary of the shape
  97  *      itself.
  98  *
  99  *      -  The intended ability to place a new point at the current cursor
 100  *      position by pressing RETURN does not seem to work.
 101  *
 102  *      -  The Status bar tooltip should change to reflect editing mode
 103  *      and tell the user about RETURN and how to use the tool.
 104  *
 105  *  -  Connection points general:
 106  *
 107  *      -  Connection points that were inside the shape can end up outside
 108  *      after a rotation is applied to the shape in the select tool.
 109  *      It doesn't seem like the correct transform is being applied to
 110  *      these, or it is being applied at the wrong time.  I'd expect
 111  *      connection points to rotate with the shape, and stay at the
 112  *      same position "on the shape"
 113  *
 114  *      -  I was able to make the connectors attached to a shape fall off
 115  *      the shape after scaling it.  Not sure the exact cause, but may
 116  *      require more investigation/debugging.
 117  *
 118  *      -  The user-defined connection points should be either absolute
 119  *      (as the current ones are) or defined as a percentage of the
 120  *      shape.  These would be based on a toggle setting on the
 121  *      toolbar, and they would be placed in exactly the same way by
 122  *      the user.  The only difference would be that they would be
 123  *      store as percentage positions in the SVG connection-points
 124  *      property and that they would update/move automatically if the
 125  *      object was resized or scaled.
 126  *
 127  *      -  Thinking more, I think you always want to store and think about
 128  *      the positions of connection points to be pre-transform, but
 129  *      obviously the shape transform is applied to them.  That way,
 130  *      they will rotate and scale automatically with the shape, when
 131  *      the shape transform is altered.  The Percentage version would
 132  *      compute their position from the pre-transform dimensions and
 133  *      then have the transform applied to them, for example.
 134  *
 135  *      -  The connection points in the test_connection_points.svg file
 136  *      seem to follow the shape when it is moved, but connection
 137  *      points I add to new shapes, do not follow the shape, either
 138  *      when the shape is just moved or transformed.  There is
 139  *      something wrong here.  What exactly should the behaviour be
 140  *      currently?
 141  *
 142  *      -  I see that connection points are specified at absolute canvas
 143  *      positions.  I really think that they should be specified in
 144  *      shape coordinated relative to the shapes.  There may be
 145  *      transforms applied to layers and the canvas which would make
 146  *      specifying them quite difficult.  I'd expect a position of 0, 0
 147  *      to be on the shape in question or very close to it, for example.
 148  *
 149  */
 150
 151
 152
 153 #include <gdk/gdkkeysyms.h>
 154 #include <string>
 155 #include <cstring>
 156
 157 #include "connector-context.h"
 158 #include "pixmaps/cursor-connector.xpm"
 159 #include "pixmaps/cursor-node.xpm"
 160 //#include "pixmaps/cursor-node-m.xpm"
 161 //#include "pixmaps/cursor-node-d.xpm"
 162 #include "xml/node-event-vector.h"
 163 #include "xml/repr.h"
 164 #include "svg/svg.h"
 165 #include "desktop.h"
 166 #include "desktop-style.h"
 167 #include "desktop-handles.h"
 168 #include "document.h"
 169 #include "message-context.h"
 170 #include "message-stack.h"
 171 #include "selection.h"
 172 #include "inkscape.h"
 173 #include "preferences.h"
 174 #include "sp-path.h"
 175 #include "display/canvas-bpath.h"
 176 #include "display/sodipodi-ctrl.h"
 177 #include <glibmm/i18n.h>
 178 #include <glibmm/stringutils.h>
 179 #include "snap.h"
 180 #include "knot.h"
 181 #include "sp-conn-end.h"
 182 #include "sp-conn-end-pair.h"
 183 #include "conn-avoid-ref.h"
 184 #include "libavoid/vertices.h"
 185 #include "libavoid/router.h"
 186 #include "context-fns.h"
 187 #include "sp-namedview.h"
 188 #include "sp-text.h"
 189 #include "sp-flowtext.h"
 190 #include "display/curve.h"
 191
 192 using Inkscape::DocumentUndo;
 193
 194 static void sp_connector_context_class_init(SPConnectorContextClass *klass);
 195 static void sp_connector_context_init(SPConnectorContext *conn_context);
 196 static void sp_connector_context_dispose(GObject *object);
 197
 198 static void sp_connector_context_setup(SPEventContext *ec);
 199 static void sp_connector_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val);
 200 static void sp_connector_context_finish(SPEventContext *ec);
 201 static gint sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event);
 202 static gint sp_connector_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
 203
 204 // Stuff borrowed from DrawContext
 205 static void spcc_connector_set_initial_point(SPConnectorContext *cc, Geom::Point const p);
 206 static void spcc_connector_set_subsequent_point(SPConnectorContext *cc, Geom::Point const p);
 207 static void spcc_connector_finish_segment(SPConnectorContext *cc, Geom::Point p);
 208 static void spcc_reset_colors(SPConnectorContext *cc);
 209 static void spcc_connector_finish(SPConnectorContext *cc);
 210 static void spcc_concat_colors_and_flush(SPConnectorContext *cc);
 211 static void spcc_flush_white(SPConnectorContext *cc, SPCurve *gc);
 212
 213 // Context event handlers
 214 static gint connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent);
 215 static gint connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent);
 216 static gint connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent);
 217 static gint connector_handle_key_press(SPConnectorContext *const cc, guint const keyval);
 218
 219 static void cc_active_shape_add_knot(SPDesktop* desktop, SPItem* item, ConnectionPointMap &cphandles, ConnectionPoint& cp);
 220 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item);
 221 static void cc_clear_active_shape(SPConnectorContext *cc);
 222 static void cc_set_active_conn(SPConnectorContext *cc, SPItem *item);
 223 static void cc_clear_active_conn(SPConnectorContext *cc);
 224 static bool conn_pt_handle_test(SPConnectorContext *cc, Geom::Point& p, gchar **href, gchar **cpid);
 225 static void cc_select_handle(SPKnot* knot);
 226 static void cc_deselect_handle(SPKnot* knot);
 227 static bool cc_item_is_shape(SPItem *item);
 228 static void cc_selection_changed(Inkscape::Selection *selection, gpointer data);
 229 static void cc_connector_rerouting_finish(SPConnectorContext *const cc,
 230         Geom::Point *const p);
 231
 232 static void shape_event_attr_deleted(Inkscape::XML::Node *repr,
 233         Inkscape::XML::Node *child, Inkscape::XML::Node *ref, gpointer data);
 234 static void shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
 235         gchar const *old_value, gchar const *new_value, bool is_interactive,
 236         gpointer data);
 237
 238
 239 static char* cc_knot_tips[] = { _("<b>Connection point</b>: click or drag to create a new connector"),
 240                            _("<b>Connection point</b>: click to select, drag to move") };
 241
 242 /*static Geom::Point connector_drag_origin_w(0, 0);
 243 static bool connector_within_tolerance = false;*/
 244 static SPEventContextClass *parent_class;
 245
 246
 247 static Inkscape::XML::NodeEventVector shape_repr_events = {
 248     NULL, /* child_added */
 249     NULL, /* child_added */
 250     shape_event_attr_changed,
 251     NULL, /* content_changed */
 252     NULL  /* order_changed */
 253 };
 254
 255 static Inkscape::XML::NodeEventVector layer_repr_events = {
 256     NULL, /* child_added */
 257     shape_event_attr_deleted,
 258     NULL, /* child_added */
 259     NULL, /* content_changed */
 260     NULL  /* order_changed */
 261 };
 262
 263
 264 GType
 265 sp_connector_context_get_type(void)
 266 {
 267     static GType type = 0;
 268     if (!type) {
 269         GTypeInfo info = {
 270             sizeof(SPConnectorContextClass),
 271             NULL, NULL,
 272             (GClassInitFunc) sp_connector_context_class_init,
 273             NULL, NULL,
 274             sizeof(SPConnectorContext),
 275             4,
 276             (GInstanceInitFunc) sp_connector_context_init,
 277             NULL,   /* value_table */
 278         };
 279         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPConnectorContext", &info, (GTypeFlags)0);
 280     }
 281     return type;
 282 }
 283
 284 static void
 285 sp_connector_context_class_init(SPConnectorContextClass *klass)
 286 {
 287     GObjectClass *object_class;
 288     SPEventContextClass *event_context_class;
 289
 290     object_class = (GObjectClass *) klass;
 291     event_context_class = (SPEventContextClass *) klass;
 292
 293     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 294
 295     object_class->dispose = sp_connector_context_dispose;
 296
 297     event_context_class->setup = sp_connector_context_setup;
 298     event_context_class->set = sp_connector_context_set;
 299     event_context_class->finish = sp_connector_context_finish;
 300     event_context_class->root_handler = sp_connector_context_root_handler;
 301     event_context_class->item_handler = sp_connector_context_item_handler;
 302 }
 303
 304
 305 static void
 306 sp_connector_context_init(SPConnectorContext *cc)
 307 {
 308     SPEventContext *ec = SP_EVENT_CONTEXT(cc);
 309
 310     ec->cursor_shape = cursor_connector_xpm;
 311     ec->hot_x = 1;
 312     ec->hot_y = 1;
 313     ec->xp = 0;
 314     ec->yp = 0;
 315
 316     cc->mode = SP_CONNECTOR_CONTEXT_DRAWING_MODE;
 317     cc->knot_tip = 0;
 318
 319     cc->red_color = 0xff00007f;
 320
 321     cc->newconn = NULL;
 322     cc->newConnRef = NULL;
 323     cc->curvature = 0.0;
 324
 325     cc->sel_changed_connection = sigc::connection();
 326
 327     cc->active_shape = NULL;
 328     cc->active_shape_repr = NULL;
 329     cc->active_shape_layer_repr = NULL;
 330
 331     cc->active_conn = NULL;
 332     cc->active_conn_repr = NULL;
 333
 334     cc->active_handle = NULL;
 335
 336     cc->selected_handle = NULL;
 337
 338     cc->clickeditem = NULL;
 339     cc->clickedhandle = NULL;
 340
 341     new (&cc->connpthandles) ConnectionPointMap();
 342
 343     for (int i = 0; i < 2; ++i) {
 344         cc->endpt_handle[i] = NULL;
 345         cc->endpt_handler_id[i] = 0;
 346     }
 347     cc->shref = NULL;
 348     cc->scpid = NULL;
 349     cc->ehref = NULL;
 350     cc->ecpid = NULL;
 351     cc->npoints = 0;
 352     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 353 }
 354
 355
 356 static void
 357 sp_connector_context_dispose(GObject *object)
 358 {
 359     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(object);
 360
 361     cc->sel_changed_connection.disconnect();
 362
 363     if (!cc->connpthandles.empty()) {
 364         for (ConnectionPointMap::iterator it = cc->connpthandles.begin();
 365                 it != cc->connpthandles.end(); ++it) {
 366             g_object_unref(it->first);
 367         }
 368         cc->connpthandles.clear();
 369     }
 370     cc->connpthandles.~ConnectionPointMap();
 371     for (int i = 0; i < 2; ++i) {
 372         if (cc->endpt_handle[1]) {
 373             g_object_unref(cc->endpt_handle[i]);
 374             cc->endpt_handle[i] = NULL;
 375         }
 376     }
 377     if (cc->shref) {
 378         g_free(cc->shref);
 379         cc->shref = NULL;
 380     }
 381     if (cc->scpid) {
 382         g_free(cc->scpid);
 383         cc->scpid = NULL;
 384     }
 385     if (cc->ehref) {
 386         g_free(cc->shref);
 387         cc->shref = NULL;
 388     }
 389     if (cc->ecpid) {
 390         g_free(cc->scpid);
 391         cc->scpid = NULL;
 392     }
 393     g_assert( cc->newConnRef == NULL );
 394
 395     G_OBJECT_CLASS(parent_class)->dispose(object);
 396 }
 397
 398
 399 static void
 400 sp_connector_context_setup(SPEventContext *ec)
 401 {
 402     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 403     SPDesktop *dt = ec->desktop;
 404
 405     if (((SPEventContextClass *) parent_class)->setup) {
 406         ((SPEventContextClass *) parent_class)->setup(ec);
 407     }
 408
 409     cc->selection = sp_desktop_selection(dt);
 410
 411     cc->sel_changed_connection.disconnect();
 412     cc->sel_changed_connection = cc->selection->connectChanged(
 413             sigc::bind(sigc::ptr_fun(&cc_selection_changed),
 414             (gpointer) cc));
 415
 416     /* Create red bpath */
 417     cc->red_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 418     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cc->red_bpath), cc->red_color,
 419             1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 420     sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cc->red_bpath), 0x00000000,
 421             SP_WIND_RULE_NONZERO);
 422     /* Create red curve */
 423     cc->red_curve = new SPCurve();
 424
 425     /* Create green curve */
 426     cc->green_curve = new SPCurve();
 427
 428     // Notice the initial selection.
 429     cc_selection_changed(cc->selection, (gpointer) cc);
 430
 431     cc->within_tolerance = false;
 432
 433     sp_event_context_read(ec, "curvature");
 434     sp_event_context_read(ec, "orthogonal");
 435     sp_event_context_read(ec, "mode");
 436     cc->knot_tip = cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE ? cc_knot_tips[0] : cc_knot_tips[1];
 437     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 438     if (prefs->getBool("/tools/connector/selcue", 0)) {
 439         ec->enableSelectionCue();
 440     }
 441
 442     // Make sure we see all enter events for canvas items,
 443     // even if a mouse button is depressed.
 444     dt->canvas->gen_all_enter_events = true;
 445 }
 446
 447
 448 static void
 449 sp_connector_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val)
 450 {
 451     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 452
 453     /* fixme: Proper error handling for non-numeric data.  Use a locale-independent function like
 454      * g_ascii_strtod (or a thin wrapper that does the right thing for invalid values inf/nan). */
 455     Glib::ustring name = val->getEntryName();
 456     if ( name == "curvature" ) {
 457         cc->curvature = val->getDoubleLimited(); // prevents NaN and +/-Inf from messing up
 458     }
 459     else if ( name == "orthogonal" ) {
 460         cc->isOrthogonal = val->getBool();
 461     }
 462     else if ( name == "mode")
 463     {
 464         sp_connector_context_switch_mode(ec, val->getBool() ? SP_CONNECTOR_CONTEXT_EDITING_MODE : SP_CONNECTOR_CONTEXT_DRAWING_MODE);
 465     }
 466 }
 467
 468 void sp_connector_context_switch_mode(SPEventContext* ec, unsigned int newMode)
 469 {
 470     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 471
 472     cc->mode = newMode;
 473     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
 474     {
 475         ec->cursor_shape = cursor_connector_xpm;
 476         cc->knot_tip = cc_knot_tips[0];
 477         if (cc->selected_handle)
 478             cc_deselect_handle( cc->selected_handle );
 479         cc->selected_handle = NULL;
 480         // Show all default connection points
 481
 482     }
 483     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
 484     {
 485         ec->cursor_shape = cursor_node_xpm;
 486         cc->knot_tip = cc_knot_tips[1];
 487 /*            if (cc->active_shape)
 488         {
 489             cc->selection->set( SP_OBJECT( cc->active_shape ) );
 490         }
 491         else
 492         {
 493             SPItem* item = cc->selection->singleItem();
 494             if ( item )
 495             {
 496                 cc_set_active_shape(cc, item);
 497                 cc->selection->set( SP_OBJECT( item ) );
 498             }
 499         }*/
 500     }
 501     sp_event_context_update_cursor(ec);
 502
 503 }
 504
 505
 506 static void
 507 sp_connector_context_finish(SPEventContext *ec)
 508 {
 509     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(ec);
 510
 511     spcc_connector_finish(cc);
 512     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 513
 514     if (((SPEventContextClass *) parent_class)->finish) {
 515         ((SPEventContextClass *) parent_class)->finish(ec);
 516     }
 517
 518     if (cc->selection) {
 519         cc->selection = NULL;
 520     }
 521     cc_clear_active_shape(cc);
 522     cc_clear_active_conn(cc);
 523
 524     // Restore the default event generating behaviour.
 525     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(ec);
 526     desktop->canvas->gen_all_enter_events = false;
 527 }
 528
 529
 530 //-----------------------------------------------------------------------------
 531
 532
 533 static void
 534 cc_clear_active_shape(SPConnectorContext *cc)
 535 {
 536     if (cc->active_shape == NULL) {
 537         return;
 538     }
 539     g_assert( cc->active_shape_repr );
 540     g_assert( cc->active_shape_layer_repr );
 541
 542     cc->active_shape = NULL;
 543
 544     if (cc->active_shape_repr) {
 545         sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
 546         Inkscape::GC::release(cc->active_shape_repr);
 547         cc->active_shape_repr = NULL;
 548
 549         sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
 550         Inkscape::GC::release(cc->active_shape_layer_repr);
 551         cc->active_shape_layer_repr = NULL;
 552     }
 553
 554     // Hide the connection points if they exist.
 555     if (cc->connpthandles.size()) {
 556         for (ConnectionPointMap::iterator it = cc->connpthandles.begin();
 557                 it != cc->connpthandles.end(); ++it) {
 558             sp_knot_hide(it->first);
 559         }
 560     }
 561 }
 562
 563
 564 static void
 565 cc_clear_active_conn(SPConnectorContext *cc)
 566 {
 567     if (cc->active_conn == NULL) {
 568         return;
 569     }
 570     g_assert( cc->active_conn_repr );
 571
 572     cc->active_conn = NULL;
 573
 574     if (cc->active_conn_repr) {
 575         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
 576         Inkscape::GC::release(cc->active_conn_repr);
 577         cc->active_conn_repr = NULL;
 578     }
 579
 580     // Hide the endpoint handles.
 581     for (int i = 0; i < 2; ++i) {
 582         if (cc->endpt_handle[i]) {
 583             sp_knot_hide(cc->endpt_handle[i]);
 584         }
 585     }
 586 }
 587
 588
 589 static bool
 590 conn_pt_handle_test(SPConnectorContext *cc, Geom::Point& p, gchar **href, gchar **cpid)
 591 {
 592     // TODO: this will need to change when there are more connection
 593     //       points available for each shape.
 594
 595     if (cc->active_handle && (cc->connpthandles.find(cc->active_handle) != cc->connpthandles.end()))
 596     {
 597         p = cc->active_handle->pos;
 598         const ConnectionPoint& cp = cc->connpthandles[cc->active_handle];
 599         *href = g_strdup_printf("#%s", cc->active_shape->getId());
 600         *cpid = g_strdup_printf("%c%d", cp.type == ConnPointDefault ? 'd' : 'u' , cp.id);
 601         return true;
 602     }
 603     *href = NULL;
 604     *cpid = NULL;
 605     return false;
 606 }
 607
 608 static void
 609 cc_select_handle(SPKnot* knot)
 610 {
 611     knot->setShape(SP_KNOT_SHAPE_SQUARE);
 612     knot->setSize(10);
 613     knot->setAnchor(GTK_ANCHOR_CENTER);
 614     knot->setFill(0x0000ffff, 0x0000ffff, 0x0000ffff);
 615     sp_knot_update_ctrl(knot);
 616 }
 617
 618 static void
 619 cc_deselect_handle(SPKnot* knot)
 620 {
 621     knot->setShape(SP_KNOT_SHAPE_SQUARE);
 622     knot->setSize(8);
 623     knot->setAnchor(GTK_ANCHOR_CENTER);
 624     knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
 625     sp_knot_update_ctrl(knot);
 626 }
 627
 628 static gint
 629 sp_connector_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 630 {
 631     gint ret = FALSE;
 632
 633     SPDesktop *desktop = event_context->desktop;
 634
 635     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(event_context);
 636
 637     Geom::Point p(event->button.x, event->button.y);
 638
 639     switch (event->type) {
 640         case GDK_BUTTON_RELEASE:
 641             if (event->button.button == 1 && !event_context->space_panning) {
 642                 if ((cc->state == SP_CONNECTOR_CONTEXT_DRAGGING) &&
 643                         (event_context->within_tolerance))
 644                 {
 645                     spcc_reset_colors(cc);
 646                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 647                 }
 648                 if (cc->state != SP_CONNECTOR_CONTEXT_IDLE) {
 649                     // Doing something else like rerouting.
 650                     break;
 651                 }
 652                 // find out clicked item, honoring Alt
 653                 SPItem *item = sp_event_context_find_item(desktop,
 654                         p, event->button.state & GDK_MOD1_MASK, FALSE);
 655
 656                 if (event->button.state & GDK_SHIFT_MASK) {
 657                     cc->selection->toggle(item);
 658                 } else {
 659                     cc->selection->set(item);
 660                     if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE && cc->selected_handle )
 661                     {
 662                         cc_deselect_handle( cc->selected_handle );
 663                         cc->selected_handle = NULL;
 664                     }
 665                     /* When selecting a new item,
 666                        do not allow showing connection points
 667                        on connectors. (yet?)
 668                     */
 669                     if ( item != cc->active_shape && !cc_item_is_connector( item ) )
 670                         cc_set_active_shape( cc, item );
 671                 }
 672                 ret = TRUE;
 673
 674             }
 675             break;
 676         case GDK_ENTER_NOTIFY:
 677         {
 678             if (cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE || (cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE && !cc->selected_handle))
 679             {
 680                 if (cc_item_is_shape(item)) {
 681
 682                     // I don't really understand what the above does,
 683                     // so I commented it.
 684                     // This is a shape, so show connection point(s).
 685     /*                if (!(cc->active_shape)
 686                             // Don't show handle for another handle.
 687     //                         || (cc->connpthandles.find((SPKnot*) item) != cc->connpthandles.end())
 688                         )
 689                     {
 690                         cc_set_active_shape(cc, item);
 691                     }*/
 692                     cc_set_active_shape(cc, item);
 693                 }
 694                 ret = TRUE;
 695             }
 696             break;
 697         }
 698         default:
 699             break;
 700     }
 701
 702     return ret;
 703 }
 704
 705
 706 gint
 707 sp_connector_context_root_handler(SPEventContext *ec, GdkEvent *event)
 708 {
 709     SPConnectorContext *const cc = SP_CONNECTOR_CONTEXT(ec);
 710
 711     gint ret = FALSE;
 712
 713     switch (event->type) {
 714         case GDK_BUTTON_PRESS:
 715             ret = connector_handle_button_press(cc, event->button);
 716             break;
 717
 718         case GDK_MOTION_NOTIFY:
 719             ret = connector_handle_motion_notify(cc, event->motion);
 720             break;
 721
 722         case GDK_BUTTON_RELEASE:
 723             ret = connector_handle_button_release(cc, event->button);
 724             break;
 725         case GDK_KEY_PRESS:
 726             ret = connector_handle_key_press(cc, get_group0_keyval (&event->key));
 727             break;
 728
 729         default:
 730             break;
 731     }
 732
 733     if (!ret) {
 734         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 735             = ((SPEventContextClass *) parent_class)->root_handler;
 736         if (parent_root_handler) {
 737             ret = parent_root_handler(ec, event);
 738         }
 739     }
 740
 741     return ret;
 742 }
 743
 744
 745 static gint
 746 connector_handle_button_press(SPConnectorContext *const cc, GdkEventButton const &bevent)
 747 {
 748     Geom::Point const event_w(bevent.x, bevent.y);
 749     /* Find desktop coordinates */
 750     Geom::Point p = cc->desktop->w2d(event_w);
 751     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 752
 753     gint ret = FALSE;
 754     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
 755     {
 756         if ( bevent.button == 1 && !event_context->space_panning ) {
 757
 758             SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 759
 760             if (Inkscape::have_viable_layer(desktop, cc->_message_context) == false) {
 761                 return TRUE;
 762             }
 763
 764             Geom::Point const event_w(bevent.x,
 765                                     bevent.y);
 766 //             connector_drag_origin_w = event_w;
 767             cc->xp = bevent.x;
 768             cc->yp = bevent.y;
 769             cc->within_tolerance = true;
 770
 771             Geom::Point const event_dt = cc->desktop->w2d(event_w);
 772
 773             SnapManager &m = cc->desktop->namedview->snap_manager;
 774
 775             switch (cc->state) {
 776                 case SP_CONNECTOR_CONTEXT_STOP:
 777                     /* This is allowed, if we just canceled curve */
 778                 case SP_CONNECTOR_CONTEXT_IDLE:
 779                 {
 780                     if ( cc->npoints == 0 ) {
 781                         cc_clear_active_conn(cc);
 782
 783                         SP_EVENT_CONTEXT_DESKTOP(cc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new connector"));
 784
 785                         /* Set start anchor */
 786                         /* Create green anchor */
 787                         Geom::Point p = event_dt;
 788
 789                         // Test whether we clicked on a connection point
 790                         bool found = conn_pt_handle_test(cc, p, &cc->shref, &cc->scpid);
 791
 792                         if (!found) {
 793                             // This is the first point, so just snap it to the grid
 794                             // as there's no other points to go off.
 795                             m.setup(cc->desktop);
 796                             m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 797                             m.unSetup();
 798                         }
 799                         spcc_connector_set_initial_point(cc, p);
 800
 801                     }
 802                     cc->state = SP_CONNECTOR_CONTEXT_DRAGGING;
 803                     ret = TRUE;
 804                     break;
 805                 }
 806                 case SP_CONNECTOR_CONTEXT_DRAGGING:
 807                 {
 808                     // This is the second click of a connector creation.
 809                     m.setup(cc->desktop);
 810                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 811                     m.unSetup();
 812
 813                     spcc_connector_set_subsequent_point(cc, p);
 814                     spcc_connector_finish_segment(cc, p);
 815                     // Test whether we clicked on a connection point
 816                     /*bool found = */conn_pt_handle_test(cc, p, &cc->ehref, &cc->ecpid);
 817                     if (cc->npoints != 0) {
 818                         spcc_connector_finish(cc);
 819                     }
 820                     cc_set_active_conn(cc, cc->newconn);
 821                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 822                     ret = TRUE;
 823                     break;
 824                 }
 825                 case SP_CONNECTOR_CONTEXT_CLOSE:
 826                 {
 827                     g_warning("Button down in CLOSE state");
 828                     break;
 829                 }
 830                 default:
 831                     break;
 832             }
 833         } else if (bevent.button == 3) {
 834             if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
 835                 // A context menu is going to be triggered here,
 836                 // so end the rerouting operation.
 837                 cc_connector_rerouting_finish(cc, &p);
 838
 839                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 840
 841                 // Don't set ret to TRUE, so we drop through to the
 842                 // parent handler which will open the context menu.
 843             }
 844             else if (cc->npoints != 0) {
 845                 spcc_connector_finish(cc);
 846                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 847                 ret = TRUE;
 848             }
 849         }
 850     }
 851     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
 852     {
 853         if ( bevent.button == 1 && !event_context->space_panning )
 854         {
 855             // Initialize variables in case of dragging
 856
 857             SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 858
 859             if (Inkscape::have_viable_layer(desktop, cc->_message_context) == false) {
 860                 return TRUE;
 861             }
 862
 863             cc->xp = bevent.x;
 864             cc->yp = bevent.y;
 865             cc->within_tolerance = true;
 866
 867             ConnectionPointMap::iterator const& active_knot_it = cc->connpthandles.find( cc->active_handle );
 868
 869             switch (cc->state)
 870             {
 871                 case SP_CONNECTOR_CONTEXT_IDLE:
 872                     if ( active_knot_it != cc->connpthandles.end() )
 873                     {
 874                         // We do not allow selecting and, thereby, moving default knots
 875                         if ( active_knot_it->second.type != ConnPointDefault)
 876                         {
 877                             if (cc->selected_handle != cc->active_handle)
 878                             {
 879                                 if ( cc->selected_handle )
 880                                     cc_deselect_handle( cc->selected_handle );
 881                                 cc->selected_handle = cc->active_handle;
 882                                 cc_select_handle( cc->selected_handle );
 883                             }
 884                         }
 885                         else
 886                             // Just ignore the default connection point
 887                             return FALSE;
 888                     }
 889                     else
 890                         if ( cc->selected_handle )
 891                         {
 892                             cc_deselect_handle( cc->selected_handle );
 893                             cc->selected_handle = NULL;
 894                         }
 895
 896                     if ( cc->selected_handle )
 897                     {
 898                         cc->state = SP_CONNECTOR_CONTEXT_DRAGGING;
 899                         cc->selection->set( SP_OBJECT( cc->active_shape ) );
 900                     }
 901
 902                     ret = TRUE;
 903                     break;
 904                 // Dragging valid because of the way we create
 905                 // new connection points.
 906                 case SP_CONNECTOR_CONTEXT_DRAGGING:
 907                     // Do nothing.
 908                     ret = TRUE;
 909                     break;
 910             }
 911         }
 912     }
 913     return ret;
 914 }
 915
 916
 917 static gint
 918 connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent)
 919 {
 920     gint ret = FALSE;
 921     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 922     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 923
 924     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 925         // allow middle-button scrolling
 926         return FALSE;
 927     }
 928
 929     Geom::Point const event_w(mevent.x, mevent.y);
 930
 931     if (cc->within_tolerance) {
 932         cc->tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 933         if ( ( abs( (gint) mevent.x - cc->xp ) < cc->tolerance ) &&
 934              ( abs( (gint) mevent.y - cc->yp ) < cc->tolerance ) ) {
 935             return FALSE;   // Do not drag if we're within tolerance from origin.
 936         }
 937     }
 938     // Once the user has moved farther than tolerance from the original location
 939     // (indicating they intend to move the object, not click), then always process
 940     // the motion notify coordinates as given (no snapping back to origin)
 941     cc->within_tolerance = false;
 942
 943     SPDesktop *const dt = cc->desktop;
 944
 945     /* Find desktop coordinates */
 946     Geom::Point p = dt->w2d(event_w);
 947
 948     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
 949     {
 950         SnapManager &m = dt->namedview->snap_manager;
 951
 952         switch (cc->state) {
 953             case SP_CONNECTOR_CONTEXT_DRAGGING:
 954             {
 955                 gobble_motion_events(mevent.state);
 956                 // This is movement during a connector creation.
 957                 if ( cc->npoints > 0 ) {
 958                     m.setup(dt);
 959                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 960                     m.unSetup();
 961                     cc->selection->clear();
 962                     spcc_connector_set_subsequent_point(cc, p);
 963                     ret = TRUE;
 964                 }
 965                 break;
 966             }
 967             case SP_CONNECTOR_CONTEXT_REROUTING:
 968             {
 969                 gobble_motion_events(GDK_BUTTON1_MASK);
 970                 g_assert( SP_IS_PATH(cc->clickeditem));
 971
 972                 m.setup(dt);
 973                 m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 974                 m.unSetup();
 975
 976                 // Update the hidden path
 977                 Geom::Matrix i2d = (cc->clickeditem)->i2d_affine();
 978                 Geom::Matrix d2i = i2d.inverse();
 979                 SPPath *path = SP_PATH(cc->clickeditem);
 980                 SPCurve *curve = path->original_curve ? path->original_curve : path->curve;
 981                 if (cc->clickedhandle == cc->endpt_handle[0]) {
 982                     Geom::Point o = cc->endpt_handle[1]->pos;
 983                     curve->stretch_endpoints(p * d2i, o * d2i);
 984                 }
 985                 else {
 986                     Geom::Point o = cc->endpt_handle[0]->pos;
 987                     curve->stretch_endpoints(o * d2i, p * d2i);
 988                 }
 989                 sp_conn_reroute_path_immediate(path);
 990
 991                 // Copy this to the temporary visible path
 992                 cc->red_curve = path->original_curve ?
 993                         path->original_curve->copy() : path->curve->copy();
 994                 cc->red_curve->transform(i2d);
 995
 996                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 997                 ret = TRUE;
 998                 break;
 999             }
1000             case SP_CONNECTOR_CONTEXT_STOP:
1001                 /* This is perfectly valid */
1002                 break;
1003             default:
1004                 if (!sp_event_context_knot_mouseover(cc)) {
1005                     m.setup(dt);
1006                     m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_OTHER_HANDLE));
1007                     m.unSetup();
1008                 }
1009                 break;
1010         }
1011     }
1012     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
1013     {
1014         switch ( cc->state )
1015         {
1016             case SP_CONNECTOR_CONTEXT_DRAGGING:
1017                 sp_knot_set_position(cc->selected_handle, p, 0);
1018                 ret = TRUE;
1019                 break;
1020             case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
1021                 sp_knot_set_position(cc->selected_handle, p, 0);
1022                 ret = TRUE;
1023                 break;
1024         }
1025     }
1026
1027     return ret;
1028 }
1029
1030
1031 static gint
1032 connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent)
1033 {
1034     gint ret = FALSE;
1035     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
1036     if ( revent.button == 1 && !event_context->space_panning ) {
1037
1038         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1039         SPDocument *doc = sp_desktop_document(desktop);
1040
1041         SnapManager &m = desktop->namedview->snap_manager;
1042
1043         Geom::Point const event_w(revent.x, revent.y);
1044
1045         /* Find desktop coordinates */
1046         Geom::Point p = cc->desktop->w2d(event_w);
1047         if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
1048         {
1049             switch (cc->state) {
1050                 //case SP_CONNECTOR_CONTEXT_POINT:
1051                 case SP_CONNECTOR_CONTEXT_DRAGGING:
1052                 {
1053                     m.setup(desktop);
1054                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1055                     m.unSetup();
1056
1057                     if (cc->within_tolerance)
1058                     {
1059                         spcc_connector_finish_segment(cc, p);
1060                         return TRUE;
1061                     }
1062                     // Connector has been created via a drag, end it now.
1063                     spcc_connector_set_subsequent_point(cc, p);
1064                     spcc_connector_finish_segment(cc, p);
1065                     // Test whether we clicked on a connection point
1066                     /*bool found = */conn_pt_handle_test(cc, p, &cc->ehref, &cc->ecpid);
1067                     if (cc->npoints != 0) {
1068                         spcc_connector_finish(cc);
1069                     }
1070                     cc_set_active_conn(cc, cc->newconn);
1071                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1072                     break;
1073                 }
1074                 case SP_CONNECTOR_CONTEXT_REROUTING:
1075                 {
1076                     m.setup(desktop);
1077                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1078                     m.unSetup();
1079                     cc_connector_rerouting_finish(cc, &p);
1080
1081                     doc->ensureUpToDate();
1082                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1083                     return TRUE;
1084                     break;
1085                 }
1086                 case SP_CONNECTOR_CONTEXT_STOP:
1087                     /* This is allowed, if we just cancelled curve */
1088                     break;
1089                 default:
1090                     break;
1091             }
1092             ret = TRUE;
1093         }
1094         else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
1095         {
1096             switch ( cc->state )
1097             {
1098                 case SP_CONNECTOR_CONTEXT_DRAGGING:
1099
1100                     if (!cc->within_tolerance)
1101                     {
1102                         m.setup(desktop);
1103                         m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1104                         m.unSetup();
1105                         sp_knot_set_position(cc->selected_handle, p, 0);
1106                         ConnectionPoint& cp = cc->connpthandles[cc->selected_handle];
1107                         cp.pos = p * (cc->active_shape)->dt2i_affine();
1108                         cc->active_shape->avoidRef->updateConnectionPoint(cp);
1109                     }
1110
1111                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1112                     ret = TRUE;
1113                     break;
1114
1115
1116                 case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
1117                     m.setup(desktop);
1118                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1119                     m.unSetup();
1120
1121                     sp_knot_set_position(cc->selected_handle, p, 0);
1122
1123                     ConnectionPoint cp;
1124                     cp.type = ConnPointUserDefined;
1125                     cp.pos = p * (cc->active_shape)->dt2i_affine();
1126                     cp.dir = Avoid::ConnDirAll;
1127                     g_object_unref(cc->selected_handle);
1128                     cc->active_shape->avoidRef->addConnectionPoint(cp);
1129                     doc->ensureUpToDate();
1130                     for (ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end(); ++it)
1131                         if (it->second.type == ConnPointUserDefined && it->second.id == cp.id)
1132                         {
1133                             cc->selected_handle = it->first;
1134                             break;
1135                         }
1136                     cc_select_handle( cc->selected_handle );
1137                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1138                     ret = TRUE;
1139                     break;
1140             }
1141         }
1142     }
1143
1144
1145     return ret;
1146 }
1147
1148
1149 static gint
1150 connector_handle_key_press(SPConnectorContext *const cc, guint const keyval)
1151 {
1152     gint ret = FALSE;
1153     /* fixme: */
1154     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
1155     {
1156         switch (keyval) {
1157             case GDK_Return:
1158             case GDK_KP_Enter:
1159                 if (cc->npoints != 0) {
1160                     spcc_connector_finish(cc);
1161                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1162                     ret = TRUE;
1163                 }
1164                 break;
1165             case GDK_Escape:
1166                 if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
1167
1168                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1169                     SPDocument *doc = sp_desktop_document(desktop);
1170
1171                     cc_connector_rerouting_finish(cc, NULL);
1172
1173                     DocumentUndo::undo(doc);
1174
1175                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1176                     desktop->messageStack()->flash( Inkscape::NORMAL_MESSAGE,
1177                             _("Connector endpoint drag cancelled."));
1178                     ret = TRUE;
1179                 }
1180                 else if (cc->npoints != 0) {
1181                     // if drawing, cancel, otherwise pass it up for deselecting
1182                     cc->state = SP_CONNECTOR_CONTEXT_STOP;
1183                     spcc_reset_colors(cc);
1184                     ret = TRUE;
1185                 }
1186                 break;
1187             default:
1188                 break;
1189         }
1190     }
1191     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
1192     {
1193         switch ( cc->state )
1194         {
1195             case SP_CONNECTOR_CONTEXT_DRAGGING:
1196                 if ( keyval == GDK_Escape )
1197                 {
1198                     // Cancel connection point dragging
1199
1200                     // Obtain original position
1201                     ConnectionPoint const& cp = cc->connpthandles[cc->selected_handle];
1202                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1203                     const Geom::Matrix& i2doc = (cc->active_shape)->i2doc_affine();
1204                     sp_knot_set_position(cc->selected_handle, cp.pos * i2doc * desktop->doc2dt(), 0);
1205                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1206                     desktop->messageStack()->flash( Inkscape::NORMAL_MESSAGE,
1207                         _("Connection point drag cancelled."));
1208                     ret = TRUE;
1209                 }
1210                 else if ( keyval == GDK_Return || keyval == GDK_KP_Enter )
1211                 {
1212                     // Put connection point at current position
1213
1214                     Geom::Point p = cc->selected_handle->pos;
1215
1216                     if (!cc->within_tolerance)
1217                     {
1218                         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1219                         SnapManager &m = desktop->namedview->snap_manager;
1220                         m.setup(desktop);
1221                         m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1222                         m.unSetup();
1223                         sp_knot_set_position(cc->selected_handle, p, 0);
1224                         ConnectionPoint& cp = cc->connpthandles[cc->selected_handle];
1225                         cp.pos = p * (cc->active_shape)->dt2i_affine();
1226                         cc->active_shape->avoidRef->updateConnectionPoint(cp);
1227                     }
1228
1229                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1230                     ret = TRUE;
1231                 }
1232                 break;
1233             case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
1234                 if ( keyval == GDK_Escape )
1235                 {
1236                     // Just destroy the knot
1237                     g_object_unref( cc->selected_handle );
1238                     cc->selected_handle = NULL;
1239                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1240                     ret = TRUE;
1241                 }
1242                 else if ( keyval == GDK_Return || keyval == GDK_KP_Enter )
1243                 {
1244                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1245                     SPDocument *doc = sp_desktop_document(desktop);
1246                     SnapManager &m = desktop->namedview->snap_manager;
1247                     m.setup(desktop);
1248                     Geom::Point p = cc->selected_handle->pos;
1249                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1250                     m.unSetup();
1251                     sp_knot_set_position(cc->selected_handle, p, 0);
1252
1253                     ConnectionPoint cp;
1254                     cp.type = ConnPointUserDefined;
1255                     cp.pos = p * (cc->active_shape)->dt2i_affine();
1256                     cp.dir = Avoid::ConnDirAll;
1257                     g_object_unref(cc->selected_handle);
1258                     cc->active_shape->avoidRef->addConnectionPoint(cp);
1259                     doc->ensureUpToDate();
1260                     for (ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end(); ++it)
1261                         if (it->second.type == ConnPointUserDefined && it->second.id == cp.id)
1262                         {
1263                             cc->selected_handle = it->first;
1264                             break;
1265                         }
1266                     cc_select_handle( cc->selected_handle );
1267                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1268                     ret = TRUE;
1269                 }
1270
1271                 break;
1272             case SP_CONNECTOR_CONTEXT_IDLE:
1273                 if ( keyval == GDK_Delete && cc->selected_handle )
1274                 {
1275                     cc->active_shape->avoidRef->deleteConnectionPoint(cc->connpthandles[cc->selected_handle]);
1276                     cc->selected_handle = NULL;
1277                     ret = TRUE;
1278                 }
1279
1280                 break;
1281         }
1282     }
1283
1284     return ret;
1285 }
1286
1287
1288 static void
1289 cc_connector_rerouting_finish(SPConnectorContext *const cc, Geom::Point *const p)
1290 {
1291     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1292     SPDocument *doc = sp_desktop_document(desktop);
1293
1294     // Clear the temporary path:
1295     cc->red_curve->reset();
1296     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1297
1298     if (p != NULL)
1299     {
1300         // Test whether we clicked on a connection point
1301         gchar *shape_label, *cpid;
1302         bool found = conn_pt_handle_test(cc, *p, &shape_label, &cpid);
1303
1304         if (found) {
1305             if (cc->clickedhandle == cc->endpt_handle[0]) {
1306                 cc->clickeditem->setAttribute("inkscape:connection-start", shape_label, false);
1307                 cc->clickeditem->setAttribute("inkscape:connection-start-point", cpid, false);
1308             }
1309             else {
1310                 cc->clickeditem->setAttribute("inkscape:connection-end", shape_label, false);
1311                 cc->clickeditem->setAttribute("inkscape:connection-end-point", cpid, false);
1312             }
1313             g_free(shape_label);
1314         }
1315     }
1316     cc->clickeditem->setHidden(false);
1317     sp_conn_reroute_path_immediate(SP_PATH(cc->clickeditem));
1318     cc->clickeditem->updateRepr();
1319     DocumentUndo::done(doc, SP_VERB_CONTEXT_CONNECTOR,
1320                      _("Reroute connector"));
1321     cc_set_active_conn(cc, cc->clickeditem);
1322 }
1323
1324
1325 static void
1326 spcc_reset_colors(SPConnectorContext *cc)
1327 {
1328     /* Red */
1329     cc->red_curve->reset();
1330     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1331
1332     cc->green_curve->reset();
1333     cc->npoints = 0;
1334 }
1335
1336
1337 static void
1338 spcc_connector_set_initial_point(SPConnectorContext *const cc, Geom::Point const p)
1339 {
1340     g_assert( cc->npoints == 0 );
1341
1342     cc->p[0] = p;
1343     cc->p[1] = p;
1344     cc->npoints = 2;
1345     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1346 }
1347
1348
1349 static void
1350 spcc_connector_set_subsequent_point(SPConnectorContext *const cc, Geom::Point const p)
1351 {
1352     g_assert( cc->npoints != 0 );
1353
1354     SPDesktop *dt = cc->desktop;
1355     Geom::Point o = dt->dt2doc(cc->p[0]);
1356     Geom::Point d = dt->dt2doc(p);
1357     Avoid::Point src(o[Geom::X], o[Geom::Y]);
1358     Avoid::Point dst(d[Geom::X], d[Geom::Y]);
1359
1360     if (!cc->newConnRef) {
1361         Avoid::Router *router = sp_desktop_document(dt)->router;
1362         cc->newConnRef = new Avoid::ConnRef(router);
1363         cc->newConnRef->setEndpoint(Avoid::VertID::src, src);
1364         if (cc->isOrthogonal)
1365             cc->newConnRef->setRoutingType(Avoid::ConnType_Orthogonal);
1366         else
1367             cc->newConnRef->setRoutingType(Avoid::ConnType_PolyLine);
1368     }
1369     // Set new endpoint.
1370     cc->newConnRef->setEndpoint(Avoid::VertID::tar, dst);
1371     // Immediately generate new routes for connector.
1372     cc->newConnRef->makePathInvalid();
1373     cc->newConnRef->router()->processTransaction();
1374     // Recreate curve from libavoid route.
1375     recreateCurve( cc->red_curve, cc->newConnRef, cc->curvature );
1376     cc->red_curve->transform(dt->doc2dt());
1377     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
1378 }
1379
1380
1381 /**
1382  * Concats red, blue and green.
1383  * If any anchors are defined, process these, optionally removing curves from white list
1384  * Invoke _flush_white to write result back to object.
1385  */
1386 static void
1387 spcc_concat_colors_and_flush(SPConnectorContext *cc)
1388 {
1389     SPCurve *c = cc->green_curve;
1390     cc->green_curve = new SPCurve();
1391
1392     cc->red_curve->reset();
1393     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1394
1395     if (c->is_empty()) {
1396         c->unref();
1397         return;
1398     }
1399
1400     spcc_flush_white(cc, c);
1401
1402     c->unref();
1403 }
1404
1405
1406 /*
1407  * Flushes white curve(s) and additional curve into object
1408  *
1409  * No cleaning of colored curves - this has to be done by caller
1410  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
1411  *
1412  */
1413
1414 static void
1415 spcc_flush_white(SPConnectorContext *cc, SPCurve *gc)
1416 {
1417     SPCurve *c;
1418
1419     if (gc) {
1420         c = gc;
1421         c->ref();
1422     } else {
1423         return;
1424     }
1425
1426     /* Now we have to go back to item coordinates at last */
1427     c->transform(SP_EVENT_CONTEXT_DESKTOP(cc)->dt2doc());
1428
1429     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1430     SPDocument *doc = sp_desktop_document(desktop);
1431     Inkscape::XML::Document *xml_doc = doc->getReprDoc();
1432
1433     if ( c && !c->is_empty() ) {
1434         /* We actually have something to write */
1435
1436         Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
1437         /* Set style */
1438         sp_desktop_apply_style_tool(desktop, repr, "/tools/connector", false);
1439
1440         gchar *str = sp_svg_write_path( c->get_pathvector() );
1441         g_assert( str != NULL );
1442         repr->setAttribute("d", str);
1443         g_free(str);
1444
1445         /* Attach repr */
1446         cc->newconn = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
1447         cc->newconn->transform = SP_ITEM(desktop->currentLayer())->i2doc_affine().inverse();
1448
1449         bool connection = false;
1450         cc->newconn->setAttribute( "inkscape:connector-type",
1451                                    cc->isOrthogonal ? "orthogonal" : "polyline", false );
1452         cc->newconn->setAttribute( "inkscape:connector-curvature",
1453                                    Glib::Ascii::dtostr(cc->curvature).c_str(), false );
1454         if (cc->shref)
1455         {
1456             cc->newconn->setAttribute( "inkscape:connection-start", cc->shref, false);
1457             if (cc->scpid) {
1458                 cc->newconn->setAttribute( "inkscape:connection-start-point", cc->scpid, false);
1459             }
1460             connection = true;
1461         }
1462
1463         if (cc->ehref)
1464         {
1465             cc->newconn->setAttribute( "inkscape:connection-end", cc->ehref, false);
1466             if (cc->ecpid) {
1467                 cc->newconn->setAttribute( "inkscape:connection-end-point", cc->ecpid, false);
1468             }
1469             connection = true;
1470         }
1471         // Process pending updates.
1472         cc->newconn->updateRepr();
1473         doc->ensureUpToDate();
1474
1475         if (connection) {
1476             // Adjust endpoints to shape edge.
1477             sp_conn_reroute_path_immediate(SP_PATH(cc->newconn));
1478             cc->newconn->updateRepr();
1479         }
1480
1481         // Only set the selection after we are finished with creating the attributes of
1482         // the connector.  Otherwise, the selection change may alter the defaults for
1483         // values like curvature in the connector context, preventing subsequent lookup
1484         // of their original values.
1485         cc->selection->set(repr);
1486         Inkscape::GC::release(repr);
1487     }
1488
1489     c->unref();
1490
1491     DocumentUndo::done(doc, SP_VERB_CONTEXT_CONNECTOR, _("Create connector"));
1492 }
1493
1494
1495 static void
1496 spcc_connector_finish_segment(SPConnectorContext *const cc, Geom::Point const /*p*/)
1497 {
1498     if (!cc->red_curve->is_empty()) {
1499         cc->green_curve->append_continuous(cc->red_curve, 0.0625);
1500
1501         cc->p[0] = cc->p[3];
1502         cc->p[1] = cc->p[4];
1503         cc->npoints = 2;
1504
1505         cc->red_curve->reset();
1506     }
1507 }
1508
1509
1510 static void
1511 spcc_connector_finish(SPConnectorContext *const cc)
1512 {
1513     SPDesktop *const desktop = cc->desktop;
1514     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Finishing connector"));
1515
1516     cc->red_curve->reset();
1517     spcc_concat_colors_and_flush(cc);
1518
1519     cc->npoints = 0;
1520
1521     if (cc->newConnRef) {
1522         cc->newConnRef->removeFromGraph();
1523         delete cc->newConnRef;
1524         cc->newConnRef = NULL;
1525     }
1526 }
1527
1528
1529 static gboolean
1530 cc_generic_knot_handler(SPCanvasItem *, GdkEvent *event, SPKnot *knot)
1531 {
1532     g_assert (knot != NULL);
1533
1534     g_object_ref(knot);
1535
1536     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(
1537             knot->desktop->event_context);
1538
1539     gboolean consumed = FALSE;
1540
1541     gchar* knot_tip = knot->tip ? knot->tip : cc->knot_tip;
1542     switch (event->type) {
1543         case GDK_ENTER_NOTIFY:
1544             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, TRUE);
1545
1546             cc->active_handle = knot;
1547             if (knot_tip)
1548             {
1549                 knot->desktop->event_context->defaultMessageContext()->set(
1550                         Inkscape::NORMAL_MESSAGE, knot_tip);
1551             }
1552
1553             consumed = TRUE;
1554             break;
1555         case GDK_LEAVE_NOTIFY:
1556             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, FALSE);
1557
1558             cc->active_handle = NULL;
1559
1560             if (knot_tip) {
1561                 knot->desktop->event_context->defaultMessageContext()->clear();
1562             }
1563
1564             consumed = TRUE;
1565             break;
1566         default:
1567             break;
1568     }
1569
1570     g_object_unref(knot);
1571
1572     return consumed;
1573 }
1574
1575
1576 static gboolean
1577 endpt_handler(SPKnot */*knot*/, GdkEvent *event, SPConnectorContext *cc)
1578 {
1579     g_assert( SP_IS_CONNECTOR_CONTEXT(cc) );
1580
1581     gboolean consumed = FALSE;
1582
1583     switch (event->type) {
1584         case GDK_BUTTON_PRESS:
1585             g_assert( (cc->active_handle == cc->endpt_handle[0]) ||
1586                       (cc->active_handle == cc->endpt_handle[1]) );
1587             if (cc->state == SP_CONNECTOR_CONTEXT_IDLE) {
1588                 cc->clickeditem = cc->active_conn;
1589                 cc->clickedhandle = cc->active_handle;
1590                 cc_clear_active_conn(cc);
1591                 cc->state = SP_CONNECTOR_CONTEXT_REROUTING;
1592
1593                 // Disconnect from attached shape
1594                 unsigned ind = (cc->active_handle == cc->endpt_handle[0]) ? 0 : 1;
1595                 sp_conn_end_detach(cc->clickeditem, ind);
1596
1597                 Geom::Point origin;
1598                 if (cc->clickedhandle == cc->endpt_handle[0]) {
1599                     origin = cc->endpt_handle[1]->pos;
1600                 }
1601                 else {
1602                     origin = cc->endpt_handle[0]->pos;
1603                 }
1604
1605                 // Show the red path for dragging.
1606                 cc->red_curve = SP_PATH(cc->clickeditem)->original_curve ? SP_PATH(cc->clickeditem)->original_curve->copy() : SP_PATH(cc->clickeditem)->curve->copy();
1607                 Geom::Matrix i2d = (cc->clickeditem)->i2d_affine();
1608                 cc->red_curve->transform(i2d);
1609                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
1610
1611                 cc->clickeditem->setHidden(true);
1612
1613                 // The rest of the interaction rerouting the connector is
1614                 // handled by the context root handler.
1615                 consumed = TRUE;
1616             }
1617             break;
1618         default:
1619             break;
1620     }
1621
1622     return consumed;
1623 }
1624
1625 static void cc_active_shape_add_knot(SPDesktop* desktop, SPItem* item, ConnectionPointMap &cphandles, ConnectionPoint& cp)
1626 {
1627         SPKnot *knot = sp_knot_new(desktop, 0);
1628
1629         knot->setShape(SP_KNOT_SHAPE_SQUARE);
1630         knot->setSize(8);
1631         knot->setAnchor(GTK_ANCHOR_CENTER);
1632         knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1633         sp_knot_update_ctrl(knot);
1634
1635         // We don't want to use the standard knot handler.
1636         g_signal_handler_disconnect(G_OBJECT(knot->item),
1637                 knot->_event_handler_id);
1638         knot->_event_handler_id = 0;
1639
1640         gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1641                 GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1642         sp_knot_set_position(knot, item->avoidRef->getConnectionPointPos(cp.type, cp.id) * desktop->doc2dt(), 0);
1643         sp_knot_show(knot);
1644         cphandles[knot] = cp;
1645 }
1646
1647 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item)
1648 {
1649     g_assert(item != NULL );
1650
1651     std::map<int, ConnectionPoint>* connpts = &item->avoidRef->connection_points;
1652
1653     if (cc->active_shape != item)
1654     {
1655         // The active shape has changed
1656         // Rebuild everything
1657         cc->active_shape = item;
1658         // Remove existing active shape listeners
1659         if (cc->active_shape_repr) {
1660             sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
1661             Inkscape::GC::release(cc->active_shape_repr);
1662
1663             sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
1664             Inkscape::GC::release(cc->active_shape_layer_repr);
1665         }
1666
1667         // Listen in case the active shape changes
1668         cc->active_shape_repr = SP_OBJECT_REPR(item);
1669         if (cc->active_shape_repr) {
1670             Inkscape::GC::anchor(cc->active_shape_repr);
1671             sp_repr_add_listener(cc->active_shape_repr, &shape_repr_events, cc);
1672
1673             cc->active_shape_layer_repr = cc->active_shape_repr->parent();
1674             Inkscape::GC::anchor(cc->active_shape_layer_repr);
1675             sp_repr_add_listener(cc->active_shape_layer_repr, &layer_repr_events, cc);
1676         }
1677
1678
1679         // Set the connection points.
1680         if ( cc->connpthandles.size() )
1681             // destroy the old list
1682             while (! cc->connpthandles.empty() )
1683             {
1684                 g_object_unref(cc->connpthandles.begin()->first);
1685                 cc->connpthandles.erase(cc->connpthandles.begin());
1686             }
1687         // build the new one
1688         if ( connpts->size() )
1689         for (std::map<int, ConnectionPoint>::iterator it = connpts->begin(); it != connpts->end(); ++it)
1690             cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, it->second);
1691
1692         // Also add default connection points
1693         // For now, only centre default connection point will
1694         // be available
1695         ConnectionPoint centre;
1696         centre.type = ConnPointDefault;
1697         centre.id = ConnPointPosCC;
1698         cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, centre);
1699     }
1700     else
1701     {
1702         // The active shape didn't change
1703         // Update only the connection point knots
1704
1705         // Ensure the item's connection_points map
1706         // has been updated
1707         item->document->ensureUpToDate();
1708
1709         std::set<int> seen;
1710         for  ( ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end() ;)
1711         {
1712             bool removed = false;
1713             if ( it->second.type == ConnPointUserDefined )
1714             {
1715                 std::map<int, ConnectionPoint>::iterator p = connpts->find(it->second.id);
1716                 if (p != connpts->end())
1717                 {
1718                     if ( it->second != p->second )
1719                         // Connection point position has changed
1720                         // Update knot position
1721                         sp_knot_set_position(it->first,
1722                                              item->avoidRef->getConnectionPointPos(it->second.type, it->second.id) * cc->desktop->doc2dt(), 0);
1723                     seen.insert(it->second.id);
1724                     sp_knot_show(it->first);
1725                 }
1726                 else
1727                 {
1728                     // This connection point does no longer exist,
1729                     // remove the knot
1730                     ConnectionPointMap::iterator curr = it;
1731                     ++it;
1732                     g_object_unref( curr->first );
1733                     cc->connpthandles.erase(curr);
1734                     removed = true;
1735                 }
1736             }
1737             else
1738             {
1739                 // It's a default connection point
1740                 // Just make sure it's position is correct
1741                 sp_knot_set_position(it->first,
1742                                      item->avoidRef->getConnectionPointPos(it->second.type, it->second.id) * cc->desktop->doc2dt(), 0);
1743                 sp_knot_show(it->first);
1744
1745             }
1746             if ( !removed )
1747                 ++it;
1748         }
1749         // Add knots for new connection points.
1750         if (connpts->size())
1751             for ( std::map<int, ConnectionPoint>::iterator it = connpts->begin(); it != connpts->end(); ++it )
1752                 if ( seen.find(it->first) == seen.end() )
1753                     // A new connection point has been added
1754                     // to the shape. Add a knot for it.
1755                     cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, it->second);
1756     }
1757 }
1758
1759
1760 static void
1761 cc_set_active_conn(SPConnectorContext *cc, SPItem *item)
1762 {
1763     g_assert( SP_IS_PATH(item) );
1764
1765     SPCurve *curve = SP_PATH(item)->original_curve ? SP_PATH(item)->original_curve : SP_PATH(item)->curve;
1766     Geom::Matrix i2d = item->i2d_affine();
1767
1768     if (cc->active_conn == item)
1769     {
1770         if (curve->is_empty())
1771         {
1772             // Connector is invisible because it is clipped to the boundary of
1773             // two overlpapping shapes.
1774             sp_knot_hide(cc->endpt_handle[0]);
1775             sp_knot_hide(cc->endpt_handle[1]);
1776         }
1777         else
1778         {
1779             // Just adjust handle positions.
1780             Geom::Point startpt = *(curve->first_point()) * i2d;
1781             sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1782
1783             Geom::Point endpt = *(curve->last_point()) * i2d;
1784             sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1785         }
1786
1787         return;
1788     }
1789
1790     cc->active_conn = item;
1791
1792     // Remove existing active conn listeners
1793     if (cc->active_conn_repr) {
1794         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
1795         Inkscape::GC::release(cc->active_conn_repr);
1796         cc->active_conn_repr = NULL;
1797     }
1798
1799     // Listen in case the active conn changes
1800     cc->active_conn_repr = SP_OBJECT_REPR(item);
1801     if (cc->active_conn_repr) {
1802         Inkscape::GC::anchor(cc->active_conn_repr);
1803         sp_repr_add_listener(cc->active_conn_repr, &shape_repr_events, cc);
1804     }
1805
1806     for (int i = 0; i < 2; ++i) {
1807
1808         // Create the handle if it doesn't exist
1809         if ( cc->endpt_handle[i] == NULL ) {
1810             SPKnot *knot = sp_knot_new(cc->desktop,
1811                     _("<b>Connector endpoint</b>: drag to reroute or connect to new shapes"));
1812
1813             knot->setShape(SP_KNOT_SHAPE_SQUARE);
1814             knot->setSize(7);
1815             knot->setAnchor(GTK_ANCHOR_CENTER);
1816             knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1817             knot->setStroke(0x000000ff, 0x000000ff, 0x000000ff);
1818             sp_knot_update_ctrl(knot);
1819
1820             // We don't want to use the standard knot handler,
1821             // since we don't want this knot to be draggable.
1822             g_signal_handler_disconnect(G_OBJECT(knot->item),
1823                     knot->_event_handler_id);
1824             knot->_event_handler_id = 0;
1825
1826             gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1827                     GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1828
1829             cc->endpt_handle[i] = knot;
1830         }
1831
1832         // Remove any existing handlers
1833         if (cc->endpt_handler_id[i]) {
1834             g_signal_handlers_disconnect_by_func(
1835                     G_OBJECT(cc->endpt_handle[i]->item),
1836                     (void*)G_CALLBACK(endpt_handler), (gpointer) cc );
1837             cc->endpt_handler_id[i] = 0;
1838         }
1839
1840         // Setup handlers for connector endpoints, this is
1841         // is as 'after' so that cc_generic_knot_handler is
1842         // triggered first for any endpoint.
1843         cc->endpt_handler_id[i] = g_signal_connect_after(
1844                 G_OBJECT(cc->endpt_handle[i]->item), "event",
1845                 G_CALLBACK(endpt_handler), cc);
1846     }
1847
1848     if (curve->is_empty())
1849     {
1850         // Connector is invisible because it is clipped to the boundary
1851         // of two overlpapping shapes.  So, it doesn't need endpoints.
1852         return;
1853     }
1854
1855     Geom::Point startpt = *(curve->first_point()) * i2d;
1856     sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1857
1858     Geom::Point endpt = *(curve->last_point()) * i2d;
1859     sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1860
1861     sp_knot_show(cc->endpt_handle[0]);
1862     sp_knot_show(cc->endpt_handle[1]);
1863 }
1864
1865 void cc_create_connection_point(SPConnectorContext* cc)
1866 {
1867     if (cc->active_shape && cc->state == SP_CONNECTOR_CONTEXT_IDLE)
1868     {
1869         if (cc->selected_handle)
1870         {
1871             cc_deselect_handle( cc->selected_handle );
1872         }
1873         SPKnot *knot = sp_knot_new(cc->desktop, 0);
1874         // We do not process events on this knot.
1875         g_signal_handler_disconnect(G_OBJECT(knot->item),
1876                                     knot->_event_handler_id);
1877         knot->_event_handler_id = 0;
1878
1879         cc_select_handle( knot );
1880         cc->selected_handle = knot;
1881         sp_knot_show(cc->selected_handle);
1882         cc->state = SP_CONNECTOR_CONTEXT_NEWCONNPOINT;
1883     }
1884 }
1885
1886 void cc_remove_connection_point(SPConnectorContext* cc)
1887 {
1888     if (cc->selected_handle && cc->state == SP_CONNECTOR_CONTEXT_IDLE )
1889     {
1890         cc->active_shape->avoidRef->deleteConnectionPoint(cc->connpthandles[cc->selected_handle]);
1891         cc->selected_handle = NULL;
1892     }
1893 }
1894
1895 static bool cc_item_is_shape(SPItem *item)
1896 {
1897     if (SP_IS_PATH(item)) {
1898         SPCurve *curve = (SP_SHAPE(item))->curve;
1899         if ( curve && !(curve->is_closed()) ) {
1900             // Open paths are connectors.
1901             return false;
1902         }
1903     }
1904     else if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
1905         Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1906         if (prefs->getBool("/tools/connector/ignoretext", true)) {
1907             // Don't count text as a shape we can connect connector to.
1908             return false;
1909         }
1910     }
1911     return true;
1912 }
1913
1914
1915 bool cc_item_is_connector(SPItem *item)
1916 {
1917     if (SP_IS_PATH(item)) {
1918         bool closed = SP_PATH(item)->original_curve ? SP_PATH(item)->original_curve->is_closed() : SP_PATH(item)->curve->is_closed();
1919         if (SP_PATH(item)->connEndPair.isAutoRoutingConn() && !closed) {
1920             // To be considered a connector, an object must be a non-closed
1921             // path that is marked with a "inkscape:connector-type" attribute.
1922             return true;
1923         }
1924     }
1925     return false;
1926 }
1927
1928
1929 void cc_selection_set_avoid(bool const set_avoid)
1930 {
1931     SPDesktop *desktop = inkscape_active_desktop();
1932     if (desktop == NULL) {
1933         return;
1934     }
1935
1936     SPDocument *document = sp_desktop_document(desktop);
1937
1938     Inkscape::Selection *selection = sp_desktop_selection(desktop);
1939
1940     GSList *l = (GSList *) selection->itemList();
1941
1942     int changes = 0;
1943
1944     while (l) {
1945         SPItem *item = (SPItem *) l->data;
1946
1947         char const *value = (set_avoid) ? "true" : NULL;
1948
1949         if (cc_item_is_shape(item)) {
1950             item->setAttribute("inkscape:connector-avoid", value, false);
1951             item->avoidRef->handleSettingChange();
1952             changes++;
1953         }
1954
1955         l = l->next;
1956     }
1957
1958     if (changes == 0) {
1959         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE,
1960                 _("Select <b>at least one non-connector object</b>."));
1961         return;
1962     }
1963
1964     char *event_desc = (set_avoid) ?
1965             _("Make connectors avoid selected objects") :
1966             _("Make connectors ignore selected objects");
1967     DocumentUndo::done(document, SP_VERB_CONTEXT_CONNECTOR, event_desc);
1968 }
1969
1970
1971 static void
1972 cc_selection_changed(Inkscape::Selection *selection, gpointer data)
1973 {
1974     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1975     //SPEventContext *ec = SP_EVENT_CONTEXT(cc);
1976
1977     SPItem *item = selection->singleItem();
1978
1979     if (cc->active_conn == item)
1980     {
1981         // Nothing to change.
1982         return;
1983     }
1984     if (item == NULL)
1985     {
1986         cc_clear_active_conn(cc);
1987         return;
1988     }
1989
1990     if (cc_item_is_connector(item)) {
1991         cc_set_active_conn(cc, item);
1992     }
1993 }
1994
1995
1996 static void
1997 shape_event_attr_deleted(Inkscape::XML::Node */*repr*/, Inkscape::XML::Node *child,
1998                          Inkscape::XML::Node */*ref*/, gpointer data)
1999 {
2000     g_assert(data);
2001     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
2002
2003     if (child == cc->active_shape_repr) {
2004         // The active shape has been deleted.  Clear active shape.
2005         cc_clear_active_shape(cc);
2006     }
2007 }
2008
2009
2010 static void
2011 shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
2012                          gchar const */*old_value*/, gchar const */*new_value*/,
2013                          bool /*is_interactive*/, gpointer data)
2014 {
2015     g_assert(data);
2016     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
2017
2018     // Look for changes that result in onscreen movement.
2019     if (!strcmp(name, "d") || !strcmp(name, "x") || !strcmp(name, "y") ||
2020             !strcmp(name, "width") || !strcmp(name, "height") ||
2021             !strcmp(name, "transform"))
2022     {
2023         if (repr == cc->active_shape_repr) {
2024             // Active shape has moved. Clear active shape.
2025             cc_clear_active_shape(cc);
2026         }
2027         else if (repr == cc->active_conn_repr) {
2028             // The active conn has been moved.
2029             // Set it again, which just sets new handle positions.
2030             cc_set_active_conn(cc, cc->active_conn);
2031         }
2032     }
2033     else
2034         if ( !strcmp(name, "inkscape:connection-points") )
2035             if (repr == cc->active_shape_repr)
2036                 // The connection points of the active shape
2037                 // have changed. Update them.
2038                 cc_set_active_shape(cc, cc->active_shape);
2039 }
2040
2041
2042 /*
2043   Local Variables:
2044   mode:c++
2045   c-file-style:"stroustrup"
2046   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
2047   indent-tabs-mode:nil
2048   fill-column:99
2049   End:
2050 */
2051 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :