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
 772             switch (cc->state) {
 773                 case SP_CONNECTOR_CONTEXT_STOP:
 774                     /* This is allowed, if we just canceled curve */
 775                 case SP_CONNECTOR_CONTEXT_IDLE:
 776                 {
 777                     if ( cc->npoints == 0 ) {
 778                         cc_clear_active_conn(cc);
 779
 780                         SP_EVENT_CONTEXT_DESKTOP(cc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new connector"));
 781
 782                         /* Set start anchor */
 783                         /* Create green anchor */
 784                         Geom::Point p = event_dt;
 785
 786                         // Test whether we clicked on a connection point
 787                         bool found = conn_pt_handle_test(cc, p, &cc->shref, &cc->scpid);
 788
 789                         if (!found) {
 790                             // This is the first point, so just snap it to the grid
 791                             // as there's no other points to go off.
 792                             m.setup(cc->desktop);
 793                             m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 794                             m.unSetup();
 795                         }
 796                         spcc_connector_set_initial_point(cc, p);
 797
 798                     }
 799                     cc->state = SP_CONNECTOR_CONTEXT_DRAGGING;
 800                     ret = TRUE;
 801                     break;
 802                 }
 803                 case SP_CONNECTOR_CONTEXT_DRAGGING:
 804                 {
 805                     // This is the second click of a connector creation.
 806                     m.setup(cc->desktop);
 807                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 808                     m.unSetup();
 809
 810                     spcc_connector_set_subsequent_point(cc, p);
 811                     spcc_connector_finish_segment(cc, p);
 812                     // Test whether we clicked on a connection point
 813                     /*bool found = */conn_pt_handle_test(cc, p, &cc->ehref, &cc->ecpid);
 814                     if (cc->npoints != 0) {
 815                         spcc_connector_finish(cc);
 816                     }
 817                     cc_set_active_conn(cc, cc->newconn);
 818                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 819                     ret = TRUE;
 820                     break;
 821                 }
 822                 case SP_CONNECTOR_CONTEXT_CLOSE:
 823                 {
 824                     g_warning("Button down in CLOSE state");
 825                     break;
 826                 }
 827                 default:
 828                     break;
 829             }
 830         } else if (bevent.button == 3) {
 831             if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
 832                 // A context menu is going to be triggered here,
 833                 // so end the rerouting operation.
 834                 cc_connector_rerouting_finish(cc, &p);
 835
 836                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 837
 838                 // Don't set ret to TRUE, so we drop through to the
 839                 // parent handler which will open the context menu.
 840             }
 841             else if (cc->npoints != 0) {
 842                 spcc_connector_finish(cc);
 843                 cc->state = SP_CONNECTOR_CONTEXT_IDLE;
 844                 ret = TRUE;
 845             }
 846         }
 847     }
 848     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
 849     {
 850         if ( bevent.button == 1 && !event_context->space_panning )
 851         {
 852             // Initialize variables in case of dragging
 853
 854             SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
 855
 856             if (Inkscape::have_viable_layer(desktop, cc->_message_context) == false) {
 857                 return TRUE;
 858             }
 859
 860             cc->xp = bevent.x;
 861             cc->yp = bevent.y;
 862             cc->within_tolerance = true;
 863
 864             ConnectionPointMap::iterator const& active_knot_it = cc->connpthandles.find( cc->active_handle );
 865
 866             switch (cc->state)
 867             {
 868                 case SP_CONNECTOR_CONTEXT_IDLE:
 869                     if ( active_knot_it != cc->connpthandles.end() )
 870                     {
 871                         // We do not allow selecting and, thereby, moving default knots
 872                         if ( active_knot_it->second.type != ConnPointDefault)
 873                         {
 874                             if (cc->selected_handle != cc->active_handle)
 875                             {
 876                                 if ( cc->selected_handle )
 877                                     cc_deselect_handle( cc->selected_handle );
 878                                 cc->selected_handle = cc->active_handle;
 879                                 cc_select_handle( cc->selected_handle );
 880                             }
 881                         }
 882                         else
 883                             // Just ignore the default connection point
 884                             return FALSE;
 885                     }
 886                     else
 887                         if ( cc->selected_handle )
 888                         {
 889                             cc_deselect_handle( cc->selected_handle );
 890                             cc->selected_handle = NULL;
 891                         }
 892
 893                     if ( cc->selected_handle )
 894                     {
 895                         cc->state = SP_CONNECTOR_CONTEXT_DRAGGING;
 896                         cc->selection->set( SP_OBJECT( cc->active_shape ) );
 897                     }
 898
 899                     ret = TRUE;
 900                     break;
 901                 // Dragging valid because of the way we create
 902                 // new connection points.
 903                 case SP_CONNECTOR_CONTEXT_DRAGGING:
 904                     // Do nothing.
 905                     ret = TRUE;
 906                     break;
 907             }
 908         }
 909     }
 910     return ret;
 911 }
 912
 913
 914 static gint
 915 connector_handle_motion_notify(SPConnectorContext *const cc, GdkEventMotion const &mevent)
 916 {
 917     gint ret = FALSE;
 918     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
 919     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 920
 921     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 922         // allow middle-button scrolling
 923         return FALSE;
 924     }
 925
 926     Geom::Point const event_w(mevent.x, mevent.y);
 927
 928     if (cc->within_tolerance) {
 929         cc->tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 930         if ( ( abs( (gint) mevent.x - cc->xp ) < cc->tolerance ) &&
 931              ( abs( (gint) mevent.y - cc->yp ) < cc->tolerance ) ) {
 932             return FALSE;   // Do not drag if we're within tolerance from origin.
 933         }
 934     }
 935     // Once the user has moved farther than tolerance from the original location
 936     // (indicating they intend to move the object, not click), then always process
 937     // the motion notify coordinates as given (no snapping back to origin)
 938     cc->within_tolerance = false;
 939
 940     SPDesktop *const dt = cc->desktop;
 941
 942     /* Find desktop coordinates */
 943     Geom::Point p = dt->w2d(event_w);
 944
 945     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
 946     {
 947         SnapManager &m = dt->namedview->snap_manager;
 948
 949         switch (cc->state) {
 950             case SP_CONNECTOR_CONTEXT_DRAGGING:
 951             {
 952                 gobble_motion_events(mevent.state);
 953                 // This is movement during a connector creation.
 954                 if ( cc->npoints > 0 ) {
 955                     m.setup(dt);
 956                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 957                     m.unSetup();
 958                     cc->selection->clear();
 959                     spcc_connector_set_subsequent_point(cc, p);
 960                     ret = TRUE;
 961                 }
 962                 break;
 963             }
 964             case SP_CONNECTOR_CONTEXT_REROUTING:
 965             {
 966                 gobble_motion_events(GDK_BUTTON1_MASK);
 967                 g_assert( SP_IS_PATH(cc->clickeditem));
 968
 969                 m.setup(dt);
 970                 m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
 971                 m.unSetup();
 972
 973                 // Update the hidden path
 974                 Geom::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
 975                 Geom::Matrix d2i = i2d.inverse();
 976                 SPPath *path = SP_PATH(cc->clickeditem);
 977                 SPCurve *curve = path->original_curve ? path->original_curve : path->curve;
 978                 if (cc->clickedhandle == cc->endpt_handle[0]) {
 979                     Geom::Point o = cc->endpt_handle[1]->pos;
 980                     curve->stretch_endpoints(p * d2i, o * d2i);
 981                 }
 982                 else {
 983                     Geom::Point o = cc->endpt_handle[0]->pos;
 984                     curve->stretch_endpoints(o * d2i, p * d2i);
 985                 }
 986                 sp_conn_reroute_path_immediate(path);
 987
 988                 // Copy this to the temporary visible path
 989                 cc->red_curve = path->original_curve ?
 990                         path->original_curve->copy() : path->curve->copy();
 991                 cc->red_curve->transform(i2d);
 992
 993                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
 994                 ret = TRUE;
 995                 break;
 996             }
 997             case SP_CONNECTOR_CONTEXT_STOP:
 998                 /* This is perfectly valid */
 999                 break;
1000             default:
1001                 if (!sp_event_context_knot_mouseover(cc)) {
1002                     m.setup(dt);
1003                     m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_OTHER_HANDLE));
1004                     m.unSetup();
1005                 }
1006                 break;
1007         }
1008     }
1009     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
1010     {
1011         switch ( cc->state )
1012         {
1013             case SP_CONNECTOR_CONTEXT_DRAGGING:
1014                 sp_knot_set_position(cc->selected_handle, p, 0);
1015                 ret = TRUE;
1016                 break;
1017             case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
1018                 sp_knot_set_position(cc->selected_handle, p, 0);
1019                 ret = TRUE;
1020                 break;
1021         }
1022     }
1023
1024     return ret;
1025 }
1026
1027
1028 static gint
1029 connector_handle_button_release(SPConnectorContext *const cc, GdkEventButton const &revent)
1030 {
1031     gint ret = FALSE;
1032     SPEventContext *event_context = SP_EVENT_CONTEXT(cc);
1033     if ( revent.button == 1 && !event_context->space_panning ) {
1034
1035         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1036         SPDocument *doc = sp_desktop_document(desktop);
1037
1038         SnapManager &m = desktop->namedview->snap_manager;
1039
1040         Geom::Point const event_w(revent.x, revent.y);
1041
1042         /* Find desktop coordinates */
1043         Geom::Point p = cc->desktop->w2d(event_w);
1044         if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
1045         {
1046             switch (cc->state) {
1047                 //case SP_CONNECTOR_CONTEXT_POINT:
1048                 case SP_CONNECTOR_CONTEXT_DRAGGING:
1049                 {
1050                     m.setup(desktop);
1051                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1052                     m.unSetup();
1053
1054                     if (cc->within_tolerance)
1055                     {
1056                         spcc_connector_finish_segment(cc, p);
1057                         return TRUE;
1058                     }
1059                     // Connector has been created via a drag, end it now.
1060                     spcc_connector_set_subsequent_point(cc, p);
1061                     spcc_connector_finish_segment(cc, p);
1062                     // Test whether we clicked on a connection point
1063                     /*bool found = */conn_pt_handle_test(cc, p, &cc->ehref, &cc->ecpid);
1064                     if (cc->npoints != 0) {
1065                         spcc_connector_finish(cc);
1066                     }
1067                     cc_set_active_conn(cc, cc->newconn);
1068                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1069                     break;
1070                 }
1071                 case SP_CONNECTOR_CONTEXT_REROUTING:
1072                 {
1073                     m.setup(desktop);
1074                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1075                     m.unSetup();
1076                     cc_connector_rerouting_finish(cc, &p);
1077
1078                     sp_document_ensure_up_to_date(doc);
1079                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1080                     return TRUE;
1081                     break;
1082                 }
1083                 case SP_CONNECTOR_CONTEXT_STOP:
1084                     /* This is allowed, if we just cancelled curve */
1085                     break;
1086                 default:
1087                     break;
1088             }
1089             ret = TRUE;
1090         }
1091         else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
1092         {
1093             switch ( cc->state )
1094             {
1095                 case SP_CONNECTOR_CONTEXT_DRAGGING:
1096
1097                     if (!cc->within_tolerance)
1098                     {
1099                         m.setup(desktop);
1100                         m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1101                         m.unSetup();
1102                         sp_knot_set_position(cc->selected_handle, p, 0);
1103                         ConnectionPoint& cp = cc->connpthandles[cc->selected_handle];
1104                         cp.pos = p * sp_item_dt2i_affine(cc->active_shape);
1105                         cc->active_shape->avoidRef->updateConnectionPoint(cp);
1106                     }
1107
1108                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1109                     ret = TRUE;
1110                     break;
1111
1112
1113                 case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
1114                     m.setup(desktop);
1115                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1116                     m.unSetup();
1117
1118                     sp_knot_set_position(cc->selected_handle, p, 0);
1119
1120                     ConnectionPoint cp;
1121                     cp.type = ConnPointUserDefined;
1122                     cp.pos = p * sp_item_dt2i_affine(cc->active_shape);
1123                     cp.dir = Avoid::ConnDirAll;
1124                     g_object_unref(cc->selected_handle);
1125                     cc->active_shape->avoidRef->addConnectionPoint(cp);
1126                     sp_document_ensure_up_to_date(doc);
1127                     for (ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end(); ++it)
1128                         if (it->second.type == ConnPointUserDefined && it->second.id == cp.id)
1129                         {
1130                             cc->selected_handle = it->first;
1131                             break;
1132                         }
1133                     cc_select_handle( cc->selected_handle );
1134                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1135                     ret = TRUE;
1136                     break;
1137             }
1138         }
1139     }
1140
1141
1142     return ret;
1143 }
1144
1145
1146 static gint
1147 connector_handle_key_press(SPConnectorContext *const cc, guint const keyval)
1148 {
1149     gint ret = FALSE;
1150     /* fixme: */
1151     if ( cc->mode == SP_CONNECTOR_CONTEXT_DRAWING_MODE )
1152     {
1153         switch (keyval) {
1154             case GDK_Return:
1155             case GDK_KP_Enter:
1156                 if (cc->npoints != 0) {
1157                     spcc_connector_finish(cc);
1158                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1159                     ret = TRUE;
1160                 }
1161                 break;
1162             case GDK_Escape:
1163                 if (cc->state == SP_CONNECTOR_CONTEXT_REROUTING) {
1164
1165                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1166                     SPDocument *doc = sp_desktop_document(desktop);
1167
1168                     cc_connector_rerouting_finish(cc, NULL);
1169
1170                     sp_document_undo(doc);
1171
1172                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1173                     desktop->messageStack()->flash( Inkscape::NORMAL_MESSAGE,
1174                             _("Connector endpoint drag cancelled."));
1175                     ret = TRUE;
1176                 }
1177                 else if (cc->npoints != 0) {
1178                     // if drawing, cancel, otherwise pass it up for deselecting
1179                     cc->state = SP_CONNECTOR_CONTEXT_STOP;
1180                     spcc_reset_colors(cc);
1181                     ret = TRUE;
1182                 }
1183                 break;
1184             default:
1185                 break;
1186         }
1187     }
1188     else if ( cc->mode == SP_CONNECTOR_CONTEXT_EDITING_MODE )
1189     {
1190         switch ( cc->state )
1191         {
1192             case SP_CONNECTOR_CONTEXT_DRAGGING:
1193                 if ( keyval == GDK_Escape )
1194                 {
1195                     // Cancel connection point dragging
1196
1197                     // Obtain original position
1198                     ConnectionPoint const& cp = cc->connpthandles[cc->selected_handle];
1199                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1200                     const Geom::Matrix& i2doc = sp_item_i2doc_affine(cc->active_shape);
1201                     sp_knot_set_position(cc->selected_handle, cp.pos * i2doc * desktop->doc2dt(), 0);
1202                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1203                     desktop->messageStack()->flash( Inkscape::NORMAL_MESSAGE,
1204                         _("Connection point drag cancelled."));
1205                     ret = TRUE;
1206                 }
1207                 else if ( keyval == GDK_Return || keyval == GDK_KP_Enter )
1208                 {
1209                     // Put connection point at current position
1210
1211                     Geom::Point p = cc->selected_handle->pos;
1212
1213                     if (!cc->within_tolerance)
1214                     {
1215                         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1216                         SnapManager &m = desktop->namedview->snap_manager;
1217                         m.setup(desktop);
1218                         m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1219                         m.unSetup();
1220                         sp_knot_set_position(cc->selected_handle, p, 0);
1221                         ConnectionPoint& cp = cc->connpthandles[cc->selected_handle];
1222                         cp.pos = p * sp_item_dt2i_affine(cc->active_shape);
1223                         cc->active_shape->avoidRef->updateConnectionPoint(cp);
1224                     }
1225
1226                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1227                     ret = TRUE;
1228                 }
1229                 break;
1230             case SP_CONNECTOR_CONTEXT_NEWCONNPOINT:
1231                 if ( keyval == GDK_Escape )
1232                 {
1233                     // Just destroy the knot
1234                     g_object_unref( cc->selected_handle );
1235                     cc->selected_handle = NULL;
1236                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1237                     ret = TRUE;
1238                 }
1239                 else if ( keyval == GDK_Return || keyval == GDK_KP_Enter )
1240                 {
1241                     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1242                     SPDocument *doc = sp_desktop_document(desktop);
1243                     SnapManager &m = desktop->namedview->snap_manager;
1244                     m.setup(desktop);
1245                     Geom::Point p = cc->selected_handle->pos;
1246                     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_OTHER_HANDLE);
1247                     m.unSetup();
1248                     sp_knot_set_position(cc->selected_handle, p, 0);
1249
1250                     ConnectionPoint cp;
1251                     cp.type = ConnPointUserDefined;
1252                     cp.pos = p * sp_item_dt2i_affine(cc->active_shape);
1253                     cp.dir = Avoid::ConnDirAll;
1254                     g_object_unref(cc->selected_handle);
1255                     cc->active_shape->avoidRef->addConnectionPoint(cp);
1256                     sp_document_ensure_up_to_date(doc);
1257                     for (ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end(); ++it)
1258                         if (it->second.type == ConnPointUserDefined && it->second.id == cp.id)
1259                         {
1260                             cc->selected_handle = it->first;
1261                             break;
1262                         }
1263                     cc_select_handle( cc->selected_handle );
1264                     cc->state = SP_CONNECTOR_CONTEXT_IDLE;
1265                     ret = TRUE;
1266                 }
1267
1268                 break;
1269             case SP_CONNECTOR_CONTEXT_IDLE:
1270                 if ( keyval == GDK_Delete && cc->selected_handle )
1271                 {
1272                     cc->active_shape->avoidRef->deleteConnectionPoint(cc->connpthandles[cc->selected_handle]);
1273                     cc->selected_handle = NULL;
1274                     ret = TRUE;
1275                 }
1276
1277                 break;
1278         }
1279     }
1280
1281     return ret;
1282 }
1283
1284
1285 static void
1286 cc_connector_rerouting_finish(SPConnectorContext *const cc, Geom::Point *const p)
1287 {
1288     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1289     SPDocument *doc = sp_desktop_document(desktop);
1290
1291     // Clear the temporary path:
1292     cc->red_curve->reset();
1293     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1294
1295     if (p != NULL)
1296     {
1297         // Test whether we clicked on a connection point
1298         gchar *shape_label, *cpid;
1299         bool found = conn_pt_handle_test(cc, *p, &shape_label, &cpid);
1300
1301         if (found) {
1302             if (cc->clickedhandle == cc->endpt_handle[0]) {
1303                 sp_object_setAttribute(cc->clickeditem,
1304                         "inkscape:connection-start", shape_label, false);
1305                 sp_object_setAttribute(cc->clickeditem,
1306                         "inkscape:connection-start-point", cpid, false);
1307             }
1308             else {
1309                 sp_object_setAttribute(cc->clickeditem,
1310                         "inkscape:connection-end", shape_label, false);
1311                 sp_object_setAttribute(cc->clickeditem,
1312                         "inkscape:connection-end-point", cpid, false);
1313             }
1314             g_free(shape_label);
1315         }
1316     }
1317     cc->clickeditem->setHidden(false);
1318     sp_conn_reroute_path_immediate(SP_PATH(cc->clickeditem));
1319     cc->clickeditem->updateRepr();
1320     sp_document_done(doc, SP_VERB_CONTEXT_CONNECTOR,
1321                      _("Reroute connector"));
1322     cc_set_active_conn(cc, cc->clickeditem);
1323 }
1324
1325
1326 static void
1327 spcc_reset_colors(SPConnectorContext *cc)
1328 {
1329     /* Red */
1330     cc->red_curve->reset();
1331     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1332
1333     cc->green_curve->reset();
1334     cc->npoints = 0;
1335 }
1336
1337
1338 static void
1339 spcc_connector_set_initial_point(SPConnectorContext *const cc, Geom::Point const p)
1340 {
1341     g_assert( cc->npoints == 0 );
1342
1343     cc->p[0] = p;
1344     cc->p[1] = p;
1345     cc->npoints = 2;
1346     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1347 }
1348
1349
1350 static void
1351 spcc_connector_set_subsequent_point(SPConnectorContext *const cc, Geom::Point const p)
1352 {
1353     g_assert( cc->npoints != 0 );
1354
1355     SPDesktop *dt = cc->desktop;
1356     Geom::Point o = dt->dt2doc(cc->p[0]);
1357     Geom::Point d = dt->dt2doc(p);
1358     Avoid::Point src(o[Geom::X], o[Geom::Y]);
1359     Avoid::Point dst(d[Geom::X], d[Geom::Y]);
1360
1361     if (!cc->newConnRef) {
1362         Avoid::Router *router = sp_desktop_document(dt)->router;
1363         cc->newConnRef = new Avoid::ConnRef(router);
1364         cc->newConnRef->setEndpoint(Avoid::VertID::src, src);
1365         if (cc->isOrthogonal)
1366             cc->newConnRef->setRoutingType(Avoid::ConnType_Orthogonal);
1367         else
1368             cc->newConnRef->setRoutingType(Avoid::ConnType_PolyLine);
1369     }
1370     // Set new endpoint.
1371     cc->newConnRef->setEndpoint(Avoid::VertID::tar, dst);
1372     // Immediately generate new routes for connector.
1373     cc->newConnRef->makePathInvalid();
1374     cc->newConnRef->router()->processTransaction();
1375     // Recreate curve from libavoid route.
1376     recreateCurve( cc->red_curve, cc->newConnRef, cc->curvature );
1377     cc->red_curve->transform(dt->doc2dt());
1378     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
1379 }
1380
1381
1382 /**
1383  * Concats red, blue and green.
1384  * If any anchors are defined, process these, optionally removing curves from white list
1385  * Invoke _flush_white to write result back to object.
1386  */
1387 static void
1388 spcc_concat_colors_and_flush(SPConnectorContext *cc)
1389 {
1390     SPCurve *c = cc->green_curve;
1391     cc->green_curve = new SPCurve();
1392
1393     cc->red_curve->reset();
1394     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), NULL);
1395
1396     if (c->is_empty()) {
1397         c->unref();
1398         return;
1399     }
1400
1401     spcc_flush_white(cc, c);
1402
1403     c->unref();
1404 }
1405
1406
1407 /*
1408  * Flushes white curve(s) and additional curve into object
1409  *
1410  * No cleaning of colored curves - this has to be done by caller
1411  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
1412  *
1413  */
1414
1415 static void
1416 spcc_flush_white(SPConnectorContext *cc, SPCurve *gc)
1417 {
1418     SPCurve *c;
1419
1420     if (gc) {
1421         c = gc;
1422         c->ref();
1423     } else {
1424         return;
1425     }
1426
1427     /* Now we have to go back to item coordinates at last */
1428     c->transform(SP_EVENT_CONTEXT_DESKTOP(cc)->dt2doc());
1429
1430     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(cc);
1431     SPDocument *doc = sp_desktop_document(desktop);
1432     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
1433
1434     if ( c && !c->is_empty() ) {
1435         /* We actually have something to write */
1436
1437         Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
1438         /* Set style */
1439         sp_desktop_apply_style_tool(desktop, repr, "/tools/connector", false);
1440
1441         gchar *str = sp_svg_write_path( c->get_pathvector() );
1442         g_assert( str != NULL );
1443         repr->setAttribute("d", str);
1444         g_free(str);
1445
1446         /* Attach repr */
1447         cc->newconn = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
1448         cc->newconn->transform = sp_item_i2doc_affine(SP_ITEM(desktop->currentLayer())).inverse();
1449
1450         bool connection = false;
1451         sp_object_setAttribute(cc->newconn, "inkscape:connector-type",
1452                 cc->isOrthogonal ? "orthogonal" : "polyline", false);
1453         sp_object_setAttribute(cc->newconn, "inkscape:connector-curvature",
1454                 Glib::Ascii::dtostr(cc->curvature).c_str(), false);
1455         if (cc->shref)
1456         {
1457             sp_object_setAttribute(cc->newconn, "inkscape:connection-start",
1458                     cc->shref, false);
1459             if (cc->scpid)
1460                 sp_object_setAttribute(cc->newconn, "inkscape:connection-start-point",
1461                         cc->scpid, false);
1462             connection = true;
1463         }
1464
1465         if (cc->ehref)
1466         {
1467             sp_object_setAttribute(cc->newconn, "inkscape:connection-end",
1468                     cc->ehref, false);
1469             if (cc->ecpid)
1470                 sp_object_setAttribute(cc->newconn, "inkscape:connection-end-point",
1471                         cc->ecpid, false);
1472             connection = true;
1473         }
1474         // Process pending updates.
1475         cc->newconn->updateRepr();
1476         sp_document_ensure_up_to_date(doc);
1477
1478         if (connection) {
1479             // Adjust endpoints to shape edge.
1480             sp_conn_reroute_path_immediate(SP_PATH(cc->newconn));
1481             cc->newconn->updateRepr();
1482         }
1483
1484         // Only set the selection after we are finished with creating the attributes of
1485         // the connector.  Otherwise, the selection change may alter the defaults for
1486         // values like curvature in the connector context, preventing subsequent lookup
1487         // of their original values.
1488         cc->selection->set(repr);
1489         Inkscape::GC::release(repr);
1490     }
1491
1492     c->unref();
1493
1494     sp_document_done(doc, SP_VERB_CONTEXT_CONNECTOR, _("Create connector"));
1495 }
1496
1497
1498 static void
1499 spcc_connector_finish_segment(SPConnectorContext *const cc, Geom::Point const /*p*/)
1500 {
1501     if (!cc->red_curve->is_empty()) {
1502         cc->green_curve->append_continuous(cc->red_curve, 0.0625);
1503
1504         cc->p[0] = cc->p[3];
1505         cc->p[1] = cc->p[4];
1506         cc->npoints = 2;
1507
1508         cc->red_curve->reset();
1509     }
1510 }
1511
1512
1513 static void
1514 spcc_connector_finish(SPConnectorContext *const cc)
1515 {
1516     SPDesktop *const desktop = cc->desktop;
1517     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Finishing connector"));
1518
1519     cc->red_curve->reset();
1520     spcc_concat_colors_and_flush(cc);
1521
1522     cc->npoints = 0;
1523
1524     if (cc->newConnRef) {
1525         cc->newConnRef->removeFromGraph();
1526         delete cc->newConnRef;
1527         cc->newConnRef = NULL;
1528     }
1529 }
1530
1531
1532 static gboolean
1533 cc_generic_knot_handler(SPCanvasItem *, GdkEvent *event, SPKnot *knot)
1534 {
1535     g_assert (knot != NULL);
1536
1537     g_object_ref(knot);
1538
1539     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(
1540             knot->desktop->event_context);
1541
1542     gboolean consumed = FALSE;
1543
1544     gchar* knot_tip = knot->tip ? knot->tip : cc->knot_tip;
1545     switch (event->type) {
1546         case GDK_ENTER_NOTIFY:
1547             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, TRUE);
1548
1549             cc->active_handle = knot;
1550             if (knot_tip)
1551             {
1552                 knot->desktop->event_context->defaultMessageContext()->set(
1553                         Inkscape::NORMAL_MESSAGE, knot_tip);
1554             }
1555
1556             consumed = TRUE;
1557             break;
1558         case GDK_LEAVE_NOTIFY:
1559             sp_knot_set_flag(knot, SP_KNOT_MOUSEOVER, FALSE);
1560
1561             cc->active_handle = NULL;
1562
1563             if (knot_tip) {
1564                 knot->desktop->event_context->defaultMessageContext()->clear();
1565             }
1566
1567             consumed = TRUE;
1568             break;
1569         default:
1570             break;
1571     }
1572
1573     g_object_unref(knot);
1574
1575     return consumed;
1576 }
1577
1578
1579 static gboolean
1580 endpt_handler(SPKnot */*knot*/, GdkEvent *event, SPConnectorContext *cc)
1581 {
1582     g_assert( SP_IS_CONNECTOR_CONTEXT(cc) );
1583
1584     gboolean consumed = FALSE;
1585
1586     switch (event->type) {
1587         case GDK_BUTTON_PRESS:
1588             g_assert( (cc->active_handle == cc->endpt_handle[0]) ||
1589                       (cc->active_handle == cc->endpt_handle[1]) );
1590             if (cc->state == SP_CONNECTOR_CONTEXT_IDLE) {
1591                 cc->clickeditem = cc->active_conn;
1592                 cc->clickedhandle = cc->active_handle;
1593                 cc_clear_active_conn(cc);
1594                 cc->state = SP_CONNECTOR_CONTEXT_REROUTING;
1595
1596                 // Disconnect from attached shape
1597                 unsigned ind = (cc->active_handle == cc->endpt_handle[0]) ? 0 : 1;
1598                 sp_conn_end_detach(cc->clickeditem, ind);
1599
1600                 Geom::Point origin;
1601                 if (cc->clickedhandle == cc->endpt_handle[0]) {
1602                     origin = cc->endpt_handle[1]->pos;
1603                 }
1604                 else {
1605                     origin = cc->endpt_handle[0]->pos;
1606                 }
1607
1608                 // Show the red path for dragging.
1609                 cc->red_curve = SP_PATH(cc->clickeditem)->original_curve ? SP_PATH(cc->clickeditem)->original_curve->copy() : SP_PATH(cc->clickeditem)->curve->copy();
1610                 Geom::Matrix i2d = sp_item_i2d_affine(cc->clickeditem);
1611                 cc->red_curve->transform(i2d);
1612                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cc->red_bpath), cc->red_curve);
1613
1614                 cc->clickeditem->setHidden(true);
1615
1616                 // The rest of the interaction rerouting the connector is
1617                 // handled by the context root handler.
1618                 consumed = TRUE;
1619             }
1620             break;
1621         default:
1622             break;
1623     }
1624
1625     return consumed;
1626 }
1627
1628 static void cc_active_shape_add_knot(SPDesktop* desktop, SPItem* item, ConnectionPointMap &cphandles, ConnectionPoint& cp)
1629 {
1630         SPKnot *knot = sp_knot_new(desktop, 0);
1631
1632         knot->setShape(SP_KNOT_SHAPE_SQUARE);
1633         knot->setSize(8);
1634         knot->setAnchor(GTK_ANCHOR_CENTER);
1635         knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1636         sp_knot_update_ctrl(knot);
1637
1638         // We don't want to use the standard knot handler.
1639         g_signal_handler_disconnect(G_OBJECT(knot->item),
1640                 knot->_event_handler_id);
1641         knot->_event_handler_id = 0;
1642
1643         gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1644                 GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1645         sp_knot_set_position(knot, item->avoidRef->getConnectionPointPos(cp.type, cp.id) * desktop->doc2dt(), 0);
1646         sp_knot_show(knot);
1647         cphandles[knot] = cp;
1648 }
1649
1650 static void cc_set_active_shape(SPConnectorContext *cc, SPItem *item)
1651 {
1652     g_assert(item != NULL );
1653
1654     std::map<int, ConnectionPoint>* connpts = &item->avoidRef->connection_points;
1655
1656     if (cc->active_shape != item)
1657     {
1658         // The active shape has changed
1659         // Rebuild everything
1660         cc->active_shape = item;
1661         // Remove existing active shape listeners
1662         if (cc->active_shape_repr) {
1663             sp_repr_remove_listener_by_data(cc->active_shape_repr, cc);
1664             Inkscape::GC::release(cc->active_shape_repr);
1665
1666             sp_repr_remove_listener_by_data(cc->active_shape_layer_repr, cc);
1667             Inkscape::GC::release(cc->active_shape_layer_repr);
1668         }
1669
1670         // Listen in case the active shape changes
1671         cc->active_shape_repr = SP_OBJECT_REPR(item);
1672         if (cc->active_shape_repr) {
1673             Inkscape::GC::anchor(cc->active_shape_repr);
1674             sp_repr_add_listener(cc->active_shape_repr, &shape_repr_events, cc);
1675
1676             cc->active_shape_layer_repr = cc->active_shape_repr->parent();
1677             Inkscape::GC::anchor(cc->active_shape_layer_repr);
1678             sp_repr_add_listener(cc->active_shape_layer_repr, &layer_repr_events, cc);
1679         }
1680
1681
1682         // Set the connection points.
1683         if ( cc->connpthandles.size() )
1684             // destroy the old list
1685             while (! cc->connpthandles.empty() )
1686             {
1687                 g_object_unref(cc->connpthandles.begin()->first);
1688                 cc->connpthandles.erase(cc->connpthandles.begin());
1689             }
1690         // build the new one
1691         if ( connpts->size() )
1692         for (std::map<int, ConnectionPoint>::iterator it = connpts->begin(); it != connpts->end(); ++it)
1693             cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, it->second);
1694
1695         // Also add default connection points
1696         // For now, only centre default connection point will
1697         // be available
1698         ConnectionPoint centre;
1699         centre.type = ConnPointDefault;
1700         centre.id = ConnPointPosCC;
1701         cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, centre);
1702     }
1703     else
1704     {
1705         // The active shape didn't change
1706         // Update only the connection point knots
1707
1708         // Ensure the item's connection_points map
1709         // has been updated
1710         sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
1711
1712         std::set<int> seen;
1713         for  ( ConnectionPointMap::iterator it = cc->connpthandles.begin(); it != cc->connpthandles.end() ;)
1714         {
1715             bool removed = false;
1716             if ( it->second.type == ConnPointUserDefined )
1717             {
1718                 std::map<int, ConnectionPoint>::iterator p = connpts->find(it->second.id);
1719                 if (p != connpts->end())
1720                 {
1721                     if ( it->second != p->second )
1722                         // Connection point position has changed
1723                         // Update knot position
1724                         sp_knot_set_position(it->first,
1725                                              item->avoidRef->getConnectionPointPos(it->second.type, it->second.id) * cc->desktop->doc2dt(), 0);
1726                     seen.insert(it->second.id);
1727                     sp_knot_show(it->first);
1728                 }
1729                 else
1730                 {
1731                     // This connection point does no longer exist,
1732                     // remove the knot
1733                     ConnectionPointMap::iterator curr = it;
1734                     ++it;
1735                     g_object_unref( curr->first );
1736                     cc->connpthandles.erase(curr);
1737                     removed = true;
1738                 }
1739             }
1740             else
1741             {
1742                 // It's a default connection point
1743                 // Just make sure it's position is correct
1744                 sp_knot_set_position(it->first,
1745                                      item->avoidRef->getConnectionPointPos(it->second.type, it->second.id) * cc->desktop->doc2dt(), 0);
1746                 sp_knot_show(it->first);
1747
1748             }
1749             if ( !removed )
1750                 ++it;
1751         }
1752         // Add knots for new connection points.
1753         if (connpts->size())
1754             for ( std::map<int, ConnectionPoint>::iterator it = connpts->begin(); it != connpts->end(); ++it )
1755                 if ( seen.find(it->first) == seen.end() )
1756                     // A new connection point has been added
1757                     // to the shape. Add a knot for it.
1758                     cc_active_shape_add_knot(cc->desktop, item, cc->connpthandles, it->second);
1759     }
1760 }
1761
1762
1763 static void
1764 cc_set_active_conn(SPConnectorContext *cc, SPItem *item)
1765 {
1766     g_assert( SP_IS_PATH(item) );
1767
1768     SPCurve *curve = SP_PATH(item)->original_curve ? SP_PATH(item)->original_curve : SP_PATH(item)->curve;
1769     Geom::Matrix i2d = sp_item_i2d_affine(item);
1770
1771     if (cc->active_conn == item)
1772     {
1773         if (curve->is_empty())
1774         {
1775             // Connector is invisible because it is clipped to the boundary of
1776             // two overlpapping shapes.
1777             sp_knot_hide(cc->endpt_handle[0]);
1778             sp_knot_hide(cc->endpt_handle[1]);
1779         }
1780         else
1781         {
1782             // Just adjust handle positions.
1783             Geom::Point startpt = *(curve->first_point()) * i2d;
1784             sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1785
1786             Geom::Point endpt = *(curve->last_point()) * i2d;
1787             sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1788         }
1789
1790         return;
1791     }
1792
1793     cc->active_conn = item;
1794
1795     // Remove existing active conn listeners
1796     if (cc->active_conn_repr) {
1797         sp_repr_remove_listener_by_data(cc->active_conn_repr, cc);
1798         Inkscape::GC::release(cc->active_conn_repr);
1799         cc->active_conn_repr = NULL;
1800     }
1801
1802     // Listen in case the active conn changes
1803     cc->active_conn_repr = SP_OBJECT_REPR(item);
1804     if (cc->active_conn_repr) {
1805         Inkscape::GC::anchor(cc->active_conn_repr);
1806         sp_repr_add_listener(cc->active_conn_repr, &shape_repr_events, cc);
1807     }
1808
1809     for (int i = 0; i < 2; ++i) {
1810
1811         // Create the handle if it doesn't exist
1812         if ( cc->endpt_handle[i] == NULL ) {
1813             SPKnot *knot = sp_knot_new(cc->desktop,
1814                     _("<b>Connector endpoint</b>: drag to reroute or connect to new shapes"));
1815
1816             knot->setShape(SP_KNOT_SHAPE_SQUARE);
1817             knot->setSize(7);
1818             knot->setAnchor(GTK_ANCHOR_CENTER);
1819             knot->setFill(0xffffff00, 0xff0000ff, 0xff0000ff);
1820             knot->setStroke(0x000000ff, 0x000000ff, 0x000000ff);
1821             sp_knot_update_ctrl(knot);
1822
1823             // We don't want to use the standard knot handler,
1824             // since we don't want this knot to be draggable.
1825             g_signal_handler_disconnect(G_OBJECT(knot->item),
1826                     knot->_event_handler_id);
1827             knot->_event_handler_id = 0;
1828
1829             gtk_signal_connect(GTK_OBJECT(knot->item), "event",
1830                     GTK_SIGNAL_FUNC(cc_generic_knot_handler), knot);
1831
1832             cc->endpt_handle[i] = knot;
1833         }
1834
1835         // Remove any existing handlers
1836         if (cc->endpt_handler_id[i]) {
1837             g_signal_handlers_disconnect_by_func(
1838                     G_OBJECT(cc->endpt_handle[i]->item),
1839                     (void*)G_CALLBACK(endpt_handler), (gpointer) cc );
1840             cc->endpt_handler_id[i] = 0;
1841         }
1842
1843         // Setup handlers for connector endpoints, this is
1844         // is as 'after' so that cc_generic_knot_handler is
1845         // triggered first for any endpoint.
1846         cc->endpt_handler_id[i] = g_signal_connect_after(
1847                 G_OBJECT(cc->endpt_handle[i]->item), "event",
1848                 G_CALLBACK(endpt_handler), cc);
1849     }
1850
1851     if (curve->is_empty())
1852     {
1853         // Connector is invisible because it is clipped to the boundary
1854         // of two overlpapping shapes.  So, it doesn't need endpoints.
1855         return;
1856     }
1857
1858     Geom::Point startpt = *(curve->first_point()) * i2d;
1859     sp_knot_set_position(cc->endpt_handle[0], startpt, 0);
1860
1861     Geom::Point endpt = *(curve->last_point()) * i2d;
1862     sp_knot_set_position(cc->endpt_handle[1], endpt, 0);
1863
1864     sp_knot_show(cc->endpt_handle[0]);
1865     sp_knot_show(cc->endpt_handle[1]);
1866 }
1867
1868 void cc_create_connection_point(SPConnectorContext* cc)
1869 {
1870     if (cc->active_shape && cc->state == SP_CONNECTOR_CONTEXT_IDLE)
1871     {
1872         if (cc->selected_handle)
1873         {
1874             cc_deselect_handle( cc->selected_handle );
1875         }
1876         SPKnot *knot = sp_knot_new(cc->desktop, 0);
1877         // We do not process events on this knot.
1878         g_signal_handler_disconnect(G_OBJECT(knot->item),
1879                                     knot->_event_handler_id);
1880         knot->_event_handler_id = 0;
1881
1882         cc_select_handle( knot );
1883         cc->selected_handle = knot;
1884         sp_knot_show(cc->selected_handle);
1885         cc->state = SP_CONNECTOR_CONTEXT_NEWCONNPOINT;
1886     }
1887 }
1888
1889 void cc_remove_connection_point(SPConnectorContext* cc)
1890 {
1891     if (cc->selected_handle && cc->state == SP_CONNECTOR_CONTEXT_IDLE )
1892     {
1893         cc->active_shape->avoidRef->deleteConnectionPoint(cc->connpthandles[cc->selected_handle]);
1894         cc->selected_handle = NULL;
1895     }
1896 }
1897
1898 static bool cc_item_is_shape(SPItem *item)
1899 {
1900     if (SP_IS_PATH(item)) {
1901         SPCurve *curve = (SP_SHAPE(item))->curve;
1902         if ( curve && !(curve->is_closed()) ) {
1903             // Open paths are connectors.
1904             return false;
1905         }
1906     }
1907     else if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
1908         Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1909         if (prefs->getBool("/tools/connector/ignoretext", true)) {
1910             // Don't count text as a shape we can connect connector to.
1911             return false;
1912         }
1913     }
1914     return true;
1915 }
1916
1917
1918 bool cc_item_is_connector(SPItem *item)
1919 {
1920     if (SP_IS_PATH(item)) {
1921         bool closed = SP_PATH(item)->original_curve ? SP_PATH(item)->original_curve->is_closed() : SP_PATH(item)->curve->is_closed();
1922         if (SP_PATH(item)->connEndPair.isAutoRoutingConn() && !closed) {
1923             // To be considered a connector, an object must be a non-closed
1924             // path that is marked with a "inkscape:connector-type" attribute.
1925             return true;
1926         }
1927     }
1928     return false;
1929 }
1930
1931
1932 void cc_selection_set_avoid(bool const set_avoid)
1933 {
1934     SPDesktop *desktop = inkscape_active_desktop();
1935     if (desktop == NULL) {
1936         return;
1937     }
1938
1939     SPDocument *document = sp_desktop_document(desktop);
1940
1941     Inkscape::Selection *selection = sp_desktop_selection(desktop);
1942
1943     GSList *l = (GSList *) selection->itemList();
1944
1945     int changes = 0;
1946
1947     while (l) {
1948         SPItem *item = (SPItem *) l->data;
1949
1950         char const *value = (set_avoid) ? "true" : NULL;
1951
1952         if (cc_item_is_shape(item)) {
1953             sp_object_setAttribute(item, "inkscape:connector-avoid",
1954                     value, false);
1955             item->avoidRef->handleSettingChange();
1956             changes++;
1957         }
1958
1959         l = l->next;
1960     }
1961
1962     if (changes == 0) {
1963         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE,
1964                 _("Select <b>at least one non-connector object</b>."));
1965         return;
1966     }
1967
1968     char *event_desc = (set_avoid) ?
1969             _("Make connectors avoid selected objects") :
1970             _("Make connectors ignore selected objects");
1971     sp_document_done(document, SP_VERB_CONTEXT_CONNECTOR, event_desc);
1972 }
1973
1974
1975 static void
1976 cc_selection_changed(Inkscape::Selection *selection, gpointer data)
1977 {
1978     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
1979     //SPEventContext *ec = SP_EVENT_CONTEXT(cc);
1980
1981     SPItem *item = selection->singleItem();
1982
1983     if (cc->active_conn == item)
1984     {
1985         // Nothing to change.
1986         return;
1987     }
1988     if (item == NULL)
1989     {
1990         cc_clear_active_conn(cc);
1991         return;
1992     }
1993
1994     if (cc_item_is_connector(item)) {
1995         cc_set_active_conn(cc, item);
1996     }
1997 }
1998
1999
2000 static void
2001 shape_event_attr_deleted(Inkscape::XML::Node */*repr*/, Inkscape::XML::Node *child,
2002                          Inkscape::XML::Node */*ref*/, gpointer data)
2003 {
2004     g_assert(data);
2005     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
2006
2007     if (child == cc->active_shape_repr) {
2008         // The active shape has been deleted.  Clear active shape.
2009         cc_clear_active_shape(cc);
2010     }
2011 }
2012
2013
2014 static void
2015 shape_event_attr_changed(Inkscape::XML::Node *repr, gchar const *name,
2016                          gchar const */*old_value*/, gchar const */*new_value*/,
2017                          bool /*is_interactive*/, gpointer data)
2018 {
2019     g_assert(data);
2020     SPConnectorContext *cc = SP_CONNECTOR_CONTEXT(data);
2021
2022     // Look for changes that result in onscreen movement.
2023     if (!strcmp(name, "d") || !strcmp(name, "x") || !strcmp(name, "y") ||
2024             !strcmp(name, "width") || !strcmp(name, "height") ||
2025             !strcmp(name, "transform"))
2026     {
2027         if (repr == cc->active_shape_repr) {
2028             // Active shape has moved. Clear active shape.
2029             cc_clear_active_shape(cc);
2030         }
2031         else if (repr == cc->active_conn_repr) {
2032             // The active conn has been moved.
2033             // Set it again, which just sets new handle positions.
2034             cc_set_active_conn(cc, cc->active_conn);
2035         }
2036     }
2037     else
2038         if ( !strcmp(name, "inkscape:connection-points") )
2039             if (repr == cc->active_shape_repr)
2040                 // The connection points of the active shape
2041                 // have changed. Update them.
2042                 cc_set_active_shape(cc, cc->active_shape);
2043 }
2044
2045
2046 /*
2047   Local Variables:
2048   mode:c++
2049   c-file-style:"stroustrup"
2050   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
2051   indent-tabs-mode:nil
2052   fill-column:99
2053   End:
2054 */
2055 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :