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         } else if (bevent.button == 3) {
 828             if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
 829                 // A context menu is going to be triggered here,
 830                 // so end the rerouting operation.
 831                 cc_connector_rerouting_finish(cc, &p);
 832
 833                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 834
 835                 // Don't set ret to TRUE, so we drop through to the
 836                 // parent handler which will open the context menu.
 837             }
 838             else if (cc->npoints != 0) {
 839                 spcc_connector_finish(cc);
 840                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 841                 ret = TRUE;
 842             }
 843         }
 844     }
 845     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
 846     {
 847         if ( bevent.button == 1 && !event_context->space_panning )
 848         {
 849             // Initialize variables in case of dragging
 850
 851             SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 852
 853             if (Inkscape::have_viable_layer(desktop, cc->_message_context) == false) {
 854                 return TRUE;
 855             }
 856
 857             cc->xp = bevent.x;
 858             cc->yp = bevent.y;
 859             cc->within_tolerance = true;
 860
 861             ConnectionPointMap::iterator const& active_knot_it = cc->connpthandles.find( cc->active_handle );
 862
 863             switch (cc->state)
 864             {
 865                 case SP_CONNECTOR_CONTEXT_IDLE:
 866                     if ( active_knot_it != cc->connpthandles.end() )
 867                     {
 868                         // We do not allow selecting and, thereby, moving default knots
 869                         if ( active_knot_it->second.type != ConnPointDefault)
 870                         {
 871                             if (cc->selected_handle != cc->active_handle)
 872                             {
 873                                 if ( cc->selected_handle )
 874                                     cc_deselect_handle( cc->selected_handle );
 875                                 cc->selected_handle = cc->active_handle;
 876                                 cc_select_handle( cc->selected_handle );
 877                             }
 878                         }
 879                         else
 880                             // Just ignore the default connection point
 881                             return FALSE;
 882                     }
 883                     else
 884                         if ( cc->selected_handle )
 885                         {
 886                             cc_deselect_handle( cc->selected_handle );
 887                             cc->selected_handle = NULL;
 888                         }
 889
 890                     if ( cc->selected_handle )
 891                     {
 892                         cc->state = SP_CONNECTOR_CONTEXT_DRAGGING;
 893                         cc->selection->set( SP_OBJECT( cc->active_shape ) );
 894                     }
 895
 896                     ret = TRUE;
 897                     break;
 898                 // Dragging valid because of the way we create
 899                 // new connection points.
 900                 case SP_CONNECTOR_CONTEXT_DRAGGING:
 901                     // Do nothing.
 902                     ret = TRUE;
 903                     break;
 904             }
 905         }
 906     }
 907     return ret;
 908 }
 909
 910
 911 static gint
 912 connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent)
 913 {
 914     gint ret = FALSE;
 915     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 916     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 917
 918     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 919         // allow middle-button scrolling
 920         return FALSE;
 921     }
 922
 923     Geom::Point const event_w(mevent.x, mevent.y);
 924
 925     if (cc->within_tolerance) {
 926         cc->tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 927         if ( ( abs( (gint) mevent.x - cc->xp ) < cc->tolerance ) &&
 928              ( abs( (gint) mevent.y - cc->yp ) < cc->tolerance ) ) {
 929             return FALSE;   // Do not drag if we're within tolerance from origin.
 930         }
 931     }
 932     // Once the user has moved farther than tolerance from the original location
 933     // (indicating they intend to move the object, not click), then always process
 934     // the motion notify coordinates as given (no snapping back to origin)
 935     cc->within_tolerance = false;
 936
 937     SPDesktop *const dt = cc->desktop;
 938
 939     /* Find desktop coordinates */
 940     Geom::Point p = dt->w2d(event_w);
 941
 942     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
 943     {
 944         SnapManager &m = dt->namedview->snap_manager;
 945         m.setup(dt);
 946
 947         switch (cc->state) {
 948             case SP_CONNECTOR_CONTEXT_DRAGGING:
 949             {
 950                 gobble_motion_events(mevent.state);
 951                 // This is movement during a connector creation.
 952                 if ( cc->npoints > 0 ) {
 953                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 954                     cc->selection->clear();
 955                     spcc_connector_set_subsequent_point(cc, p);
 956                     ret = TRUE;
 957                 }
 958                 break;
 959             }
 960             case SP_CONNECTOR_CONTEXT_REROUTING:
 961             {
 962                 gobble_motion_events(GDK_BUTTON1_MASK);
 963                 g_assert( SP_IS_PATH(cc->clickeditem));
 964
 965                 m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 966
 967                 // Update the hidden path
 968                 Geom::Matrix i2d = (cc->clickeditem)->i2d_affine();
 969                 Geom::Matrix d2i = i2d.inverse();
 970                 SPPath *path = SP_PATH(cc->clickeditem);
 971                 SPCurve *curve = path->original_curve ? path->original_curve : path->curve;
 972                 if (cc->clickedhandle == cc->endpt_handle[0]) {
 973                     Geom::Point o = cc->endpt_handle[1]->pos;
 974                     curve->stretch_endpoints(p * d2i, o * d2i);
 975                 }
 976                 else {
 977                     Geom::Point o = cc->endpt_handle[0]->pos;
 978                     curve->stretch_endpoints(o * d2i, p * d2i);
 979                 }
 980                 sp_conn_reroute_path_immediate(path);
 981
 982                 // Copy this to the temporary visible path
 983                 cc->red_curve = path->original_curve ?
 984                         path->original_curve->copy() : path->curve->copy();
 985                 cc->red_curve->transform(i2d);
 986
 987                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 988                 ret = TRUE;
 989                 break;
 990             }
 991             case SP_CONNECTOR_CONTEXT_STOP:
 992                 /* This is perfectly valid */
 993                 break;
 994             default:
 995                 if (!sp_event_context_knot_mouseover(cc)) {
 996                     m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_OTHER_HANDLE));
 997                 }
 998                 break;
 999         }
1000     }
1001     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
1002     {
1003         switch ( cc->state )
1004         {
1005             case SP_CONNECTOR_CONTEXT_DRAGGING:
1006                 sp_knot_set_position(cc->selected_handle, p, 0);
1007                 ret = TRUE;
1008                 break;
1009             case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
1010                 sp_knot_set_position(cc->selected_handle, p, 0);
1011                 ret = TRUE;
1012                 break;
1013         }
1014     }
1015
1016     return ret;
1017 }
1018
1019
1020 static gint
1021 connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent)
1022 {
1023     gint ret = FALSE;
1024     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
1025     if ( revent.button == 1 && !event_context->space_panning ) {
1026
1027         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1028         SPDocument *doc = sp_desktop_document(desktop);
1029
1030         SnapManager &m = desktop->namedview->snap_manager;
1031         m.setup(desktop);
1032
1033         Geom::Point const event_w(revent.x, revent.y);
1034
1035         /* Find desktop coordinates */
1036         Geom::Point p = cc->desktop->w2d(event_w);
1037         if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
1038         {
1039             switch (cc->state) {
1040                 //case SP_CONNECTOR_CONTEXT_POINT:
1041                 case SP_CONNECTOR_CONTEXT_DRAGGING:
1042                 {
1043                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1044
1045                     if (cc->within_tolerance)
1046                     {
1047                         spcc_connector_finish_segment(cc, p);
1048                         return TRUE;
1049                     }
1050                     // Connector has been created via a drag, end it now.
1051                     spcc_connector_set_subsequent_point(cc, p);
1052                     spcc_connector_finish_segment(cc, p);
1053                     // Test whether we clicked on a connection point
1054                     /*bool found = */conn_pt_handle_test(cc, p, &cc->ehref, &cc->ecpid);
1055                     if (cc->npoints != 0) {
1056                         spcc_connector_finish(cc);
1057                     }
1058                     cc_set_active_conn(cc, cc->newconn);
1059                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1060                     break;
1061                 }
1062                 case SP_CONNECTOR_CONTEXT_REROUTING:
1063                 {
1064                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1065                     cc_connector_rerouting_finish(cc, &p);
1066
1067                     doc->ensure_up_to_date();
1068                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1069                     return TRUE;
1070                     break;
1071                 }
1072                 case SP_CONNECTOR_CONTEXT_STOP:
1073                     /* This is allowed, if we just cancelled curve */
1074                     break;
1075                 default:
1076                     break;
1077             }
1078             ret = TRUE;
1079         }
1080         else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
1081         {
1082             switch ( cc->state )
1083             {
1084                 case SP_CONNECTOR_CONTEXT_DRAGGING:
1085
1086                     if (!cc->within_tolerance)
1087                     {
1088                         m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1089                         sp_knot_set_position(cc->selected_handle, p, 0);
1090                         ConnectionPoint& cp = cc->connpthandles[cc->selected_handle];
1091                         cp.pos = p * (cc->active_shape)->dt2i_affine();
1092                         cc->active_shape->avoidRef->updateConnectionPoint(cp);
1093                     }
1094
1095                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1096                     ret = TRUE;
1097                     break;
1098
1099
1100                 case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
1101                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1102
1103                     sp_knot_set_position(cc->selected_handle, p, 0);
1104
1105                     ConnectionPoint cp;
1106                     cp.type = ConnPointUserDefined;
1107                     cp.pos = p * (cc->active_shape)->dt2i_affine();
1108                     cp.dir = Avoid::ConnDirAll;
1109                     g_object_unref(cc->selected_handle);
1110                     cc->active_shape->avoidRef->addConnectionPoint(cp);
1111                     doc->ensure_up_to_date();
1112                     for (ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end(); ++it)
1113                         if (it->second.type == ConnPointUserDefined && it->second.id == cp.id)
1114                         {
1115                             cc->selected_handle = it->first;
1116                             break;
1117                         }
1118                     cc_select_handle( cc->selected_handle );
1119                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1120                     ret = TRUE;
1121                     break;
1122             }
1123         }
1124     }
1125
1126
1127     return ret;
1128 }
1129
1130
1131 static gint
1132 connector_handle_key_press(SPConnectorContext *const cc, guint const keyval)
1133 {
1134     gint ret = FALSE;
1135     /* fixme: */
1136     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
1137     {
1138         switch (keyval) {
1139             case GDK_Return:
1140             case GDK_KP_Enter:
1141                 if (cc->npoints != 0) {
1142                     spcc_connector_finish(cc);
1143                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1144                     ret = TRUE;
1145                 }
1146                 break;
1147             case GDK_Escape:
1148                 if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
1149
1150                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1151                     SPDocument *doc = sp_desktop_document(desktop);
1152
1153                     cc_connector_rerouting_finish(cc, NULL);
1154
1155                     SPDocumentUndo::undo(doc);
1156
1157                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1158                     desktop->messageStack()->flash( Inkscape::NORMAL_MESSAGE,
1159                             _("Connector endpoint drag cancelled."));
1160                     ret = TRUE;
1161                 }
1162                 else if (cc->npoints != 0) {
1163                     // if drawing, cancel, otherwise pass it up for deselecting
1164                     cc->state = SP_CONNECTOR_CONTEXT_STOP;
1165                     spcc_reset_colors(cc);
1166                     ret = TRUE;
1167                 }
1168                 break;
1169             default:
1170                 break;
1171         }
1172     }
1173     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
1174     {
1175         switch ( cc->state )
1176         {
1177             case SP_CONNECTOR_CONTEXT_DRAGGING:
1178                 if ( keyval == GDK_Escape )
1179                 {
1180                     // Cancel connection point dragging
1181
1182                     // Obtain original position
1183                     ConnectionPoint const& cp = cc->connpthandles[cc->selected_handle];
1184                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1185                     const Geom::Matrix& i2doc = (cc->active_shape)->i2doc_affine();
1186                     sp_knot_set_position(cc->selected_handle, cp.pos * i2doc * desktop->doc2dt(), 0);
1187                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1188                     desktop->messageStack()->flash( Inkscape::NORMAL_MESSAGE,
1189                         _("Connection point drag cancelled."));
1190                     ret = TRUE;
1191                 }
1192                 else if ( keyval == GDK_Return || keyval == GDK_KP_Enter )
1193                 {
1194                     // Put connection point at current position
1195
1196                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1197                     SnapManager &m = desktop->namedview->snap_manager;
1198                     m.setup(desktop);
1199                     Geom::Point p = cc->selected_handle->pos;
1200 //                     SPEventContext* event_context = SP_EVENT_CONTEXT( cc );
1201
1202                     if (!cc->within_tolerance)
1203                     {
1204                         m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1205                         sp_knot_set_position(cc->selected_handle, p, 0);
1206                         ConnectionPoint& cp = cc->connpthandles[cc->selected_handle];
1207                         cp.pos = p * (cc->active_shape)->dt2i_affine();
1208                         cc->active_shape->avoidRef->updateConnectionPoint(cp);
1209                     }
1210
1211                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1212                     ret = TRUE;
1213                 }
1214                 break;
1215             case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
1216                 if ( keyval == GDK_Escape )
1217                 {
1218                     // Just destroy the knot
1219                     g_object_unref( cc->selected_handle );
1220                     cc->selected_handle = NULL;
1221                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1222                     ret = TRUE;
1223                 }
1224                 else if ( keyval == GDK_Return || keyval == GDK_KP_Enter )
1225                 {
1226                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1227                     SPDocument *doc = sp_desktop_document(desktop);
1228                     SnapManager &m = desktop->namedview->snap_manager;
1229                     m.setup(desktop);
1230                     Geom::Point p = cc->selected_handle->pos;
1231
1232                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1233
1234                     sp_knot_set_position(cc->selected_handle, p, 0);
1235
1236                     ConnectionPoint cp;
1237                     cp.type = ConnPointUserDefined;
1238                     cp.pos = p * (cc->active_shape)->dt2i_affine();
1239                     cp.dir = Avoid::ConnDirAll;
1240                     g_object_unref(cc->selected_handle);
1241                     cc->active_shape->avoidRef->addConnectionPoint(cp);
1242                     doc->ensure_up_to_date();
1243                     for (ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end(); ++it)
1244                         if (it->second.type == ConnPointUserDefined && it->second.id == cp.id)
1245                         {
1246                             cc->selected_handle = it->first;
1247                             break;
1248                         }
1249                     cc_select_handle( cc->selected_handle );
1250                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1251                     ret = TRUE;
1252                 }
1253
1254                 break;
1255             case SP_CONNECTOR_CONTEXT_IDLE:
1256                 if ( keyval == GDK_Delete && cc->selected_handle )
1257                 {
1258                     cc->active_shape->avoidRef->deleteConnectionPoint(cc->connpthandles[cc->selected_handle]);
1259                     cc->selected_handle = NULL;
1260                     ret = TRUE;
1261                 }
1262
1263                 break;
1264         }
1265     }
1266
1267     return ret;
1268 }
1269
1270
1271 static void
1272 cc_connector_rerouting_finish(SPConnectorContext *const cc, Geom::Point *const p)
1273 {
1274     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1275     SPDocument *doc = sp_desktop_document(desktop);
1276
1277     // Clear the temporary path:
1278     cc->red_curve->reset();
1279     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1280
1281     if (p != NULL)
1282     {
1283         // Test whether we clicked on a connection point
1284         gchar *shape_label, *cpid;
1285         bool found = conn_pt_handle_test(cc, *p, &shape_label, &cpid);
1286
1287         if (found) {
1288             if (cc->clickedhandle == cc->endpt_handle[0]) {
1289                 (cc->clickeditem)->setAttribute(
1290                         "inkscape:connection-start", shape_label, false);
1291                 (cc->clickeditem)->setAttribute(
1292                         "inkscape:connection-start-point", cpid, false);
1293             }
1294             else {
1295                 (cc->clickeditem)->setAttribute(
1296                         "inkscape:connection-end", shape_label, false);
1297                 (cc->clickeditem)->setAttribute(
1298                         "inkscape:connection-end-point", cpid, false);
1299             }
1300             g_free(shape_label);
1301         }
1302     }
1303     cc->clickeditem->setHidden(false);
1304     sp_conn_reroute_path_immediate(SP_PATH(cc->clickeditem));
1305     cc->clickeditem->updateRepr();
1306     SPDocumentUndo::done(doc, SP_VERB_CONTEXT_CONNECTOR,
1307                      _("Reroute connector"));
1308     cc_set_active_conn(cc, cc->clickeditem);
1309 }
1310
1311
1312 static void
1313 spcc_reset_colors(SPConnectorContext *cc)
1314 {
1315     /* Red */
1316     cc->red_curve->reset();
1317     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1318
1319     cc->green_curve->reset();
1320     cc->npoints = 0;
1321 }
1322
1323
1324 static void
1325 spcc_connector_set_initial_point(SPConnectorContext *const cc, Geom::Point const p)
1326 {
1327     g_assert( cc->npoints == 0 );
1328
1329     cc->p[0] = p;
1330     cc->p[1] = p;
1331     cc->npoints = 2;
1332     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1333 }
1334
1335
1336 static void
1337 spcc_connector_set_subsequent_point(SPConnectorContext *const cc, Geom::Point const p)
1338 {
1339     g_assert( cc->npoints != 0 );
1340
1341     SPDesktop *dt = cc->desktop;
1342     Geom::Point o = dt->dt2doc(cc->p[0]);
1343     Geom::Point d = dt->dt2doc(p);
1344     Avoid::Point src(o[Geom::X], o[Geom::Y]);
1345     Avoid::Point dst(d[Geom::X], d[Geom::Y]);
1346
1347     if (!cc->newConnRef) {
1348         Avoid::Router *router = sp_desktop_document(dt)->router;
1349         cc->newConnRef = new Avoid::ConnRef(router);
1350         cc->newConnRef->setEndpoint(Avoid::VertID::src, src);
1351         if (cc->isOrthogonal)
1352             cc->newConnRef->setRoutingType(Avoid::ConnType_Orthogonal);
1353         else
1354             cc->newConnRef->setRoutingType(Avoid::ConnType_PolyLine);
1355     }
1356     // Set new endpoint.
1357     cc->newConnRef->setEndpoint(Avoid::VertID::tar, dst);
1358     // Immediately generate new routes for connector.
1359     cc->newConnRef->makePathInvalid();
1360     cc->newConnRef->router()->processTransaction();
1361     // Recreate curve from libavoid route.
1362     recreateCurve( cc->red_curve, cc->newConnRef, cc->curvature );
1363     cc->red_curve->transform(dt->doc2dt());
1364     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
1365 }
1366
1367
1368 /**
1369  * Concats red, blue and green.
1370  * If any anchors are defined, process these, optionally removing curves from white list
1371  * Invoke _flush_white to write result back to object.
1372  */
1373 static void
1374 spcc_concat_colors_and_flush(SPConnectorContext *cc)
1375 {
1376     SPCurve *c = cc->green_curve;
1377     cc->green_curve = new SPCurve();
1378
1379     cc->red_curve->reset();
1380     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1381
1382     if (c->is_empty()) {
1383         c->unref();
1384         return;
1385     }
1386
1387     spcc_flush_white(cc, c);
1388
1389     c->unref();
1390 }
1391
1392
1393 /*
1394  * Flushes white curve(s) and additional curve into object
1395  *
1396  * No cleaning of colored curves - this has to be done by caller
1397  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
1398  *
1399  */
1400
1401 static void
1402 spcc_flush_white(SPConnectorContext *cc, SPCurve *gc)
1403 {
1404     SPCurve *c;
1405
1406     if (gc) {
1407         c = gc;
1408         c->ref();
1409     } else {
1410         return;
1411     }
1412
1413     /* Now we have to go back to item coordinates at last */
1414     c->transform(SP_EVENT_CONTEXT_DESKTOP(cc)->dt2doc());
1415
1416     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1417     SPDocument *doc = sp_desktop_document(desktop);
1418     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
1419
1420     if ( c && !c->is_empty() ) {
1421         /* We actually have something to write */
1422
1423         Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
1424         /* Set style */
1425         sp_desktop_apply_style_tool(desktop, repr, "/tools/connector", false);
1426
1427         gchar *str = sp_svg_write_path( c->get_pathvector() );
1428         g_assert( str != NULL );
1429         repr->setAttribute("d", str);
1430         g_free(str);
1431
1432         /* Attach repr */
1433         cc->newconn = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
1434         cc->newconn->transform = SP_ITEM(desktop->currentLayer())->i2doc_affine().inverse();
1435
1436         bool connection = false;
1437         (cc->newconn)->setAttribute( "inkscape:connector-type",
1438                 cc->isOrthogonal ? "orthogonal" : "polyline", false);
1439         (cc->newconn)->setAttribute( "inkscape:connector-curvature",
1440                 Glib::Ascii::dtostr(cc->curvature).c_str(), false);
1441         if (cc->shref)
1442         {
1443             (cc->newconn)->setAttribute( "inkscape:connection-start",
1444                     cc->shref, false);
1445             if (cc->scpid)
1446                 (cc->newconn)->setAttribute( "inkscape:connection-start-point",
1447                         cc->scpid, false);
1448             connection = true;
1449         }
1450
1451         if (cc->ehref)
1452         {
1453             (cc->newconn)->setAttribute( "inkscape:connection-end",
1454                     cc->ehref, false);
1455             if (cc->ecpid)
1456                 (cc->newconn)->setAttribute( "inkscape:connection-end-point",
1457                         cc->ecpid, false);
1458             connection = true;
1459         }
1460         // Process pending updates.
1461         cc->newconn->updateRepr();
1462         doc->ensure_up_to_date();
1463
1464         if (connection) {
1465             // Adjust endpoints to shape edge.
1466             sp_conn_reroute_path_immediate(SP_PATH(cc->newconn));
1467             cc->newconn->updateRepr();
1468         }
1469
1470         // Only set the selection after we are finished with creating the attributes of
1471         // the connector.  Otherwise, the selection change may alter the defaults for
1472         // values like curvature in the connector context, preventing subsequent lookup
1473         // of their original values.
1474         cc->selection->set(repr);
1475         Inkscape::GC::release(repr);
1476     }
1477
1478     c->unref();
1479
1480     SPDocumentUndo::done(doc, SP_VERB_CONTEXT_CONNECTOR, _("Create connector"));
1481 }
1482
1483
1484 static void
1485 spcc_connector_finish_segment(SPConnectorContext *const cc, Geom::Point const /*p*/)
1486 {
1487     if (!cc->red_curve->is_empty()) {
1488         cc->green_curve->append_continuous(cc->red_curve, 0.0625);
1489
1490         cc->p[0] = cc->p[3];
1491         cc->p[1] = cc->p[4];
1492         cc->npoints = 2;
1493
1494         cc->red_curve->reset();
1495     }
1496 }
1497
1498
1499 static void
1500 spcc_connector_finish(SPConnectorContext *const cc)
1501 {
1502     SPDesktop *const desktop = cc->desktop;
1503     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Finishing connector"));
1504
1505     cc->red_curve->reset();
1506     spcc_concat_colors_and_flush(cc);
1507
1508     cc->npoints = 0;
1509
1510     if (cc->newConnRef) {
1511         cc->newConnRef->removeFromGraph();
1512         delete cc->newConnRef;
1513         cc->newConnRef = NULL;
1514     }
1515 }
1516
1517
1518 static gboolean
1519 cc_generic_knot_handler(SPCanvasItem *, GdkEvent *event, SPKnot *knot)
1520 {
1521     g_assert (knot != NULL);
1522
1523     g_object_ref(knot);
1524
1525     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(
1526             knot->desktop->event_context);
1527
1528     gboolean consumed = FALSE;
1529
1530     gchar* knot_tip = knot->tip ? knot->tip : cc->knot_tip;
1531     switch (event->type) {
1532         case GDK_ENTER_NOTIFY:
1533             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, TRUE);
1534
1535             cc->active_handle = knot;
1536             if (knot_tip)
1537             {
1538                 knot->desktop->event_context->defaultMessageContext()->set(
1539                         Inkscape::NORMAL_MESSAGE, knot_tip);
1540             }
1541
1542             consumed = TRUE;
1543             break;
1544         case GDK_LEAVE_NOTIFY:
1545             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, FALSE);
1546
1547             cc->active_handle = NULL;
1548
1549             if (knot_tip) {
1550                 knot->desktop->event_context->defaultMessageContext()->clear();
1551             }
1552
1553             consumed = TRUE;
1554             break;
1555         default:
1556             break;
1557     }
1558
1559     g_object_unref(knot);
1560
1561     return consumed;
1562 }
1563
1564
1565 static gboolean
1566 endpt_handler(SPKnot */*knot*/, GdkEvent *event, SPConnectorContext *cc)
1567 {
1568     g_assert( SP_IS_CONNECTOR_CONTEXT(cc) );
1569
1570     gboolean consumed = FALSE;
1571
1572     switch (event->type) {
1573         case GDK_BUTTON_PRESS:
1574             g_assert( (cc->active_handle == cc->endpt_handle[0]) ||
1575                       (cc->active_handle == cc->endpt_handle[1]) );
1576             if (cc->state == SP_CONNECTOR_CONTEXT_IDLE) {
1577                 cc->clickeditem = cc->active_conn;
1578                 cc->clickedhandle = cc->active_handle;
1579                 cc_clear_active_conn(cc);
1580                 cc->state = SP_CONNECTOR_CONTEXT_REROUTING;
1581
1582                 // Disconnect from attached shape
1583                 unsigned ind = (cc->active_handle == cc->endpt_handle[0]) ? 0 : 1;
1584                 sp_conn_end_detach(cc->clickeditem, ind);
1585
1586                 Geom::Point origin;
1587                 if (cc->clickedhandle == cc->endpt_handle[0]) {
1588                     origin = cc->endpt_handle[1]->pos;
1589                 }
1590                 else {
1591                     origin = cc->endpt_handle[0]->pos;
1592                 }
1593
1594                 // Show the red path for dragging.
1595                 cc->red_curve = SP_PATH(cc->clickeditem)->original_curve ? SP_PATH(cc->clickeditem)->original_curve->copy() : SP_PATH(cc->clickeditem)->curve->copy();
1596                 Geom::Matrix i2d = (cc->clickeditem)->i2d_affine();
1597                 cc->red_curve->transform(i2d);
1598                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
1599
1600                 cc->clickeditem->setHidden(true);
1601
1602                 // The rest of the interaction rerouting the connector is
1603                 // handled by the context root handler.
1604                 consumed = TRUE;
1605             }
1606             break;
1607         default:
1608             break;
1609     }
1610
1611     return consumed;
1612 }
1613
1614 static void cc_active_shape_add_knot(SPDesktop* desktop, SPItem* item, ConnectionPointMap &cphandles, ConnectionPoint& cp)
1615 {
1616         SPKnot *knot = sp_knot_new(desktop, 0);
1617
1618         knot->setShape(SP_KNOT_SHAPE_SQUARE);
1619         knot->setSize(8);
1620         knot->setAnchor(GTK_ANCHOR_CENTER);
1621         knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1622         sp_knot_update_ctrl(knot);
1623
1624         // We don't want to use the standard knot handler.
1625         g_signal_handler_disconnect(G_OBJECT(knot->item),
1626                 knot->_event_handler_id);
1627         knot->_event_handler_id = 0;
1628
1629         gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1630                 GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1631         sp_knot_set_position(knot, item->avoidRef->getConnectionPointPos(cp.type, cp.id) * desktop->doc2dt(), 0);
1632         sp_knot_show(knot);
1633         cphandles[knot] = cp;
1634 }
1635
1636 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item)
1637 {
1638     g_assert(item != NULL );
1639
1640     std::map<int, ConnectionPoint>* connpts = &item->avoidRef->connection_points;
1641
1642     if (cc->active_shape != item)
1643     {
1644         // The active shape has changed
1645         // Rebuild everything
1646         cc->active_shape = item;
1647         // Remove existing active shape listeners
1648         if (cc->active_shape_repr) {
1649             sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
1650             Inkscape::GC::release(cc->active_shape_repr);
1651
1652             sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
1653             Inkscape::GC::release(cc->active_shape_layer_repr);
1654         }
1655
1656         // Listen in case the active shape changes
1657         cc->active_shape_repr = SP_OBJECT_REPR(item);
1658         if (cc->active_shape_repr) {
1659             Inkscape::GC::anchor(cc->active_shape_repr);
1660             sp_repr_add_listener(cc->active_shape_repr, &shape_repr_events, cc);
1661
1662             cc->active_shape_layer_repr = cc->active_shape_repr->parent();
1663             Inkscape::GC::anchor(cc->active_shape_layer_repr);
1664             sp_repr_add_listener(cc->active_shape_layer_repr, &layer_repr_events, cc);
1665         }
1666
1667
1668         // Set the connection points.
1669         if ( cc->connpthandles.size() )
1670             // destroy the old list
1671             while (! cc->connpthandles.empty() )
1672             {
1673                 g_object_unref(cc->connpthandles.begin()->first);
1674                 cc->connpthandles.erase(cc->connpthandles.begin());
1675             }
1676         // build the new one
1677         if ( connpts->size() )
1678         for (std::map<int, ConnectionPoint>::iterator it = connpts->begin(); it != connpts->end(); ++it)
1679             cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, it->second);
1680
1681         // Also add default connection points
1682         // For now, only centre default connection point will
1683         // be available
1684         ConnectionPoint centre;
1685         centre.type = ConnPointDefault;
1686         centre.id = ConnPointPosCC;
1687         cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, centre);
1688     }
1689     else
1690     {
1691         // The active shape didn't change
1692         // Update only the connection point knots
1693
1694         // Ensure the item's connection_points map
1695         // has been updated
1696         SP_OBJECT_DOCUMENT(item)->ensure_up_to_date();
1697
1698         std::set<int> seen;
1699         for  ( ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end() ;)
1700         {
1701             bool removed = false;
1702             if ( it->second.type == ConnPointUserDefined )
1703             {
1704                 std::map<int, ConnectionPoint>::iterator p = connpts->find(it->second.id);
1705                 if (p != connpts->end())
1706                 {
1707                     if ( it->second != p->second )
1708                         // Connection point position has changed
1709                         // Update knot position
1710                         sp_knot_set_position(it->first,
1711                                              item->avoidRef->getConnectionPointPos(it->second.type, it->second.id) * cc->desktop->doc2dt(), 0);
1712                     seen.insert(it->second.id);
1713                     sp_knot_show(it->first);
1714                 }
1715                 else
1716                 {
1717                     // This connection point does no longer exist,
1718                     // remove the knot
1719                     ConnectionPointMap::iterator curr = it;
1720                     ++it;
1721                     g_object_unref( curr->first );
1722                     cc->connpthandles.erase(curr);
1723                     removed = true;
1724                 }
1725             }
1726             else
1727             {
1728                 // It's a default connection point
1729                 // Just make sure it's position is correct
1730                 sp_knot_set_position(it->first,
1731                                      item->avoidRef->getConnectionPointPos(it->second.type, it->second.id) * cc->desktop->doc2dt(), 0);
1732                 sp_knot_show(it->first);
1733
1734             }
1735             if ( !removed )
1736                 ++it;
1737         }
1738         // Add knots for new connection points.
1739         if (connpts->size())
1740             for ( std::map<int, ConnectionPoint>::iterator it = connpts->begin(); it != connpts->end(); ++it )
1741                 if ( seen.find(it->first) == seen.end() )
1742                     // A new connection point has been added
1743                     // to the shape. Add a knot for it.
1744                     cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, it->second);
1745     }
1746 }
1747
1748
1749 static void
1750 cc_set_active_conn(SPConnectorContext *cc, SPItem *item)
1751 {
1752     g_assert( SP_IS_PATH(item) );
1753
1754     SPCurve *curve = SP_PATH(item)->original_curve ? SP_PATH(item)->original_curve : SP_PATH(item)->curve;
1755     Geom::Matrix i2d = item->i2d_affine();
1756
1757     if (cc->active_conn == item)
1758     {
1759         // Just adjust handle positions.
1760         Geom::Point startpt = *(curve->first_point()) * i2d;
1761         sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1762
1763         Geom::Point endpt = *(curve->last_point()) * i2d;
1764         sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1765
1766         return;
1767     }
1768
1769     cc->active_conn = item;
1770
1771     // Remove existing active conn listeners
1772     if (cc->active_conn_repr) {
1773         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
1774         Inkscape::GC::release(cc->active_conn_repr);
1775         cc->active_conn_repr = NULL;
1776     }
1777
1778     // Listen in case the active conn changes
1779     cc->active_conn_repr = SP_OBJECT_REPR(item);
1780     if (cc->active_conn_repr) {
1781         Inkscape::GC::anchor(cc->active_conn_repr);
1782         sp_repr_add_listener(cc->active_conn_repr, &shape_repr_events, cc);
1783     }
1784
1785     for (int i = 0; i < 2; ++i) {
1786
1787         // Create the handle if it doesn't exist
1788         if ( cc->endpt_handle[i] == NULL ) {
1789             SPKnot *knot = sp_knot_new(cc->desktop,
1790                     _("<b>Connector endpoint</b>: drag to reroute or connect to new shapes"));
1791
1792             knot->setShape(SP_KNOT_SHAPE_SQUARE);
1793             knot->setSize(7);
1794             knot->setAnchor(GTK_ANCHOR_CENTER);
1795             knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1796             knot->setStroke(0x000000ff, 0x000000ff, 0x000000ff);
1797             sp_knot_update_ctrl(knot);
1798
1799             // We don't want to use the standard knot handler,
1800             // since we don't want this knot to be draggable.
1801             g_signal_handler_disconnect(G_OBJECT(knot->item),
1802                     knot->_event_handler_id);
1803             knot->_event_handler_id = 0;
1804
1805             gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1806                     GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1807
1808             cc->endpt_handle[i] = knot;
1809         }
1810
1811         // Remove any existing handlers
1812         if (cc->endpt_handler_id[i]) {
1813             g_signal_handlers_disconnect_by_func(
1814                     G_OBJECT(cc->endpt_handle[i]->item),
1815                     (void*)G_CALLBACK(endpt_handler), (gpointer) cc );
1816             cc->endpt_handler_id[i] = 0;
1817         }
1818
1819         // Setup handlers for connector endpoints, this is
1820         // is as 'after' so that cc_generic_knot_handler is
1821         // triggered first for any endpoint.
1822         cc->endpt_handler_id[i] = g_signal_connect_after(
1823                 G_OBJECT(cc->endpt_handle[i]->item), "event",
1824                 G_CALLBACK(endpt_handler), cc);
1825     }
1826
1827     Geom::Point startpt = *(curve->first_point()) * i2d;
1828     sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1829
1830     Geom::Point endpt = *(curve->last_point()) * i2d;
1831     sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1832
1833     sp_knot_show(cc->endpt_handle[0]);
1834     sp_knot_show(cc->endpt_handle[1]);
1835 }
1836
1837 void cc_create_connection_point(SPConnectorContext* cc)
1838 {
1839     if (cc->active_shape && cc->state == SP_CONNECTOR_CONTEXT_IDLE)
1840     {
1841         if (cc->selected_handle)
1842         {
1843             cc_deselect_handle( cc->selected_handle );
1844         }
1845         SPKnot *knot = sp_knot_new(cc->desktop, 0);
1846         // We do not process events on this knot.
1847         g_signal_handler_disconnect(G_OBJECT(knot->item),
1848                                     knot->_event_handler_id);
1849         knot->_event_handler_id = 0;
1850
1851         cc_select_handle( knot );
1852         cc->selected_handle = knot;
1853         sp_knot_show(cc->selected_handle);
1854         cc->state = SP_CONNECTOR_CONTEXT_NEWCONNPOINT;
1855     }
1856 }
1857
1858 void cc_remove_connection_point(SPConnectorContext* cc)
1859 {
1860     if (cc->selected_handle && cc->state == SP_CONNECTOR_CONTEXT_IDLE )
1861     {
1862         cc->active_shape->avoidRef->deleteConnectionPoint(cc->connpthandles[cc->selected_handle]);
1863         cc->selected_handle = NULL;
1864     }
1865 }
1866
1867 static bool cc_item_is_shape(SPItem *item)
1868 {
1869     if (SP_IS_PATH(item)) {
1870         SPCurve *curve = (SP_SHAPE(item))->curve;
1871         if ( curve && !(curve->is_closed()) ) {
1872             // Open paths are connectors.
1873             return false;
1874         }
1875     }
1876     else if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
1877         Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1878         if (prefs->getBool("/tools/connector/ignoretext", true)) {
1879             // Don't count text as a shape we can connect connector to.
1880             return false;
1881         }
1882     }
1883     return true;
1884 }
1885
1886
1887 bool cc_item_is_connector(SPItem *item)
1888 {
1889     if (SP_IS_PATH(item)) {
1890         if (SP_PATH(item)->connEndPair.isAutoRoutingConn()) {
1891             g_assert( SP_PATH(item)->original_curve ? !(SP_PATH(item)->original_curve->is_closed()) : !(SP_PATH(item)->curve->is_closed()) );
1892             return true;
1893         }
1894     }
1895     return false;
1896 }
1897
1898
1899 void cc_selection_set_avoid(bool const set_avoid)
1900 {
1901     SPDesktop *desktop = inkscape_active_desktop();
1902     if (desktop == NULL) {
1903         return;
1904     }
1905
1906     SPDocument *document = sp_desktop_document(desktop);
1907
1908     Inkscape::Selection *selection = sp_desktop_selection(desktop);
1909
1910     GSList *l = (GSList *) selection->itemList();
1911
1912     int changes = 0;
1913
1914     while (l) {
1915         SPItem *item = (SPItem *) l->data;
1916
1917         char const *value = (set_avoid) ? "true" : NULL;
1918
1919         if (cc_item_is_shape(item)) {
1920             item->setAttribute("inkscape:connector-avoid",
1921                     value, false);
1922             item->avoidRef->handleSettingChange();
1923             changes++;
1924         }
1925
1926         l = l->next;
1927     }
1928
1929     if (changes == 0) {
1930         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE,
1931                 _("Select <b>at least one non-connector object</b>."));
1932         return;
1933     }
1934
1935     char *event_desc = (set_avoid) ?
1936             _("Make connectors avoid selected objects") :
1937             _("Make connectors ignore selected objects");
1938     SPDocumentUndo::done(document, SP_VERB_CONTEXT_CONNECTOR, event_desc);
1939 }
1940
1941
1942 static void
1943 cc_selection_changed(Inkscape::Selection *selection, gpointer data)
1944 {
1945     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1946     //SPEventContext *ec = SP_EVENT_CONTEXT(cc);
1947
1948     SPItem *item = selection->singleItem();
1949
1950     if (cc->active_conn == item)
1951     {
1952         // Nothing to change.
1953         return;
1954     }
1955     if (item == NULL)
1956     {
1957         cc_clear_active_conn(cc);
1958         return;
1959     }
1960
1961     if (cc_item_is_connector(item)) {
1962         cc_set_active_conn(cc, item);
1963     }
1964 }
1965
1966
1967 static void
1968 shape_event_attr_deleted(Inkscape::XML::Node */*repr*/, Inkscape::XML::Node *child,
1969                          Inkscape::XML::Node */*ref*/, gpointer data)
1970 {
1971     g_assert(data);
1972     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1973
1974     if (child == cc->active_shape_repr) {
1975         // The active shape has been deleted.  Clear active shape.
1976         cc_clear_active_shape(cc);
1977     }
1978 }
1979
1980
1981 static void
1982 shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
1983                          gchar const */*old_value*/, gchar const */*new_value*/,
1984                          bool /*is_interactive*/, gpointer data)
1985 {
1986     g_assert(data);
1987     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1988
1989     // Look for changes that result in onscreen movement.
1990     if (!strcmp(name, "d") || !strcmp(name, "x") || !strcmp(name, "y") ||
1991             !strcmp(name, "width") || !strcmp(name, "height") ||
1992             !strcmp(name, "transform"))
1993     {
1994         if (repr == cc->active_shape_repr) {
1995             // Active shape has moved. Clear active shape.
1996             cc_clear_active_shape(cc);
1997         }
1998         else if (repr == cc->active_conn_repr) {
1999             // The active conn has been moved.
2000             // Set it again, which just sets new handle positions.
2001             cc_set_active_conn(cc, cc->active_conn);
2002         }
2003     }
2004     else
2005         if ( !strcmp(name, "inkscape:connection-points") )
2006             if (repr == cc->active_shape_repr)
2007                 // The connection points of the active shape
2008                 // have changed. Update them.
2009                 cc_set_active_shape(cc, cc->active_shape);
2010 }
2011
2012
2013 /*
2014   Local Variables:
2015   mode:c++
2016   c-file-style:"stroustrup"
2017   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
2018   indent-tabs-mode:nil
2019   fill-column:99
2020   End:
2021 */
2022 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :