src/pen-context.cpp

   1 /** \file
   2  * Pen event context implementation.
   3  */
   4
   5 /*
   6  * Authors:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   bulia byak <buliabyak@users.sf.net>
   9  *
  10  * Copyright (C) 2000 Lauris Kaplinski
  11  * Copyright (C) 2000-2001 Ximian, Inc.
  12  * Copyright (C) 2002 Lauris Kaplinski
  13  * Copyright (C) 2004 Monash University
  14  *
  15  * Released under GNU GPL, read the file 'COPYING' for more information
  16  */
  17
  18 #include <gdk/gdkkeysyms.h>
  19
  20 #include "pen-context.h"
  21 #include "sp-namedview.h"
  22 #include "sp-metrics.h"
  23 #include "desktop.h"
  24 #include "desktop-handles.h"
  25 #include "selection.h"
  26 #include "draw-anchor.h"
  27 #include "message-stack.h"
  28 #include "message-context.h"
  29 #include "prefs-utils.h"
  30 #include "sp-path.h"
  31
  32 #include "pixmaps/cursor-pen.xpm"
  33 #include "display/canvas-bpath.h"
  34 #include "display/sp-ctrlline.h"
  35 #include "display/sodipodi-ctrl.h"
  36 #include <glibmm/i18n.h>
  37 #include "libnr/n-art-bpath.h"
  38 #include "helper/units.h"
  39 #include "macros.h"
  40 #include "context-fns.h"
  41
  42
  43 static void sp_pen_context_class_init(SPPenContextClass *klass);
  44 static void sp_pen_context_init(SPPenContext *pc);
  45 static void sp_pen_context_dispose(GObject *object);
  46
  47 static void sp_pen_context_setup(SPEventContext *ec);
  48 static void sp_pen_context_finish(SPEventContext *ec);
  49 static void sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  50 static gint sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event);
  51
  52 static void spdc_pen_set_initial_point(SPPenContext *pc, NR::Point const p);
  53 static void spdc_pen_set_subsequent_point(SPPenContext *pc, NR::Point const p, bool statusbar);
  54 static void spdc_pen_set_ctrl(SPPenContext *pc, NR::Point const p, guint state);
  55 static void spdc_pen_finish_segment(SPPenContext *pc, NR::Point p, guint state);
  56
  57 static void spdc_pen_finish(SPPenContext *pc, gboolean closed);
  58
  59 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent);
  60 static gint pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent);
  61 static gint pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent);
  62 static gint pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent);
  63 static gint pen_handle_key_press(SPPenContext *const pc, GdkEvent *event);
  64 static void spdc_reset_colors(SPPenContext *pc);
  65
  66 static void pen_disable_events(SPPenContext *const pc);
  67 static void pen_enable_events(SPPenContext *const pc);
  68
  69 static NR::Point pen_drag_origin_w(0, 0);
  70 static bool pen_within_tolerance = false;
  71
  72 static SPDrawContextClass *pen_parent_class;
  73
  74 /**
  75  * Register SPPenContext with Gdk and return its type.
  76  */
  77 GType
  78 sp_pen_context_get_type(void)
  79 {
  80     static GType type = 0;
  81     if (!type) {
  82         GTypeInfo info = {
  83             sizeof(SPPenContextClass),
  84             NULL, NULL,
  85             (GClassInitFunc) sp_pen_context_class_init,
  86             NULL, NULL,
  87             sizeof(SPPenContext),
  88             4,
  89             (GInstanceInitFunc) sp_pen_context_init,
  90             NULL,   /* value_table */
  91         };
  92         type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPenContext", &info, (GTypeFlags)0);
  93     }
  94     return type;
  95 }
  96
  97 /**
  98  * Initialize the SPPenContext vtable.
  99  */
 100 static void
 101 sp_pen_context_class_init(SPPenContextClass *klass)
 102 {
 103     GObjectClass *object_class;
 104     SPEventContextClass *event_context_class;
 105
 106     object_class = (GObjectClass *) klass;
 107     event_context_class = (SPEventContextClass *) klass;
 108
 109     pen_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
 110
 111     object_class->dispose = sp_pen_context_dispose;
 112
 113     event_context_class->setup = sp_pen_context_setup;
 114     event_context_class->finish = sp_pen_context_finish;
 115     event_context_class->set = sp_pen_context_set;
 116     event_context_class->root_handler = sp_pen_context_root_handler;
 117 }
 118
 119 /**
 120  * Callback to initialize SPPenContext object.
 121  */
 122 static void
 123 sp_pen_context_init(SPPenContext *pc)
 124 {
 125
 126     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 127
 128     event_context->cursor_shape = cursor_pen_xpm;
 129     event_context->hot_x = 4;
 130     event_context->hot_y = 4;
 131
 132     pc->npoints = 0;
 133     pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 134     pc->state = SP_PEN_CONTEXT_POINT;
 135
 136     pc->c0 = NULL;
 137     pc->c1 = NULL;
 138     pc->cl0 = NULL;
 139     pc->cl1 = NULL;
 140
 141     pc->events_disabled = 0;
 142 }
 143
 144 /**
 145  * Callback to destroy the SPPenContext object's members and itself.
 146  */
 147 static void
 148 sp_pen_context_dispose(GObject *object)
 149 {
 150     SPPenContext *pc;
 151
 152     pc = SP_PEN_CONTEXT(object);
 153
 154     if (pc->c0) {
 155         gtk_object_destroy(GTK_OBJECT(pc->c0));
 156         pc->c0 = NULL;
 157     }
 158     if (pc->c1) {
 159         gtk_object_destroy(GTK_OBJECT(pc->c1));
 160         pc->c1 = NULL;
 161     }
 162     if (pc->cl0) {
 163         gtk_object_destroy(GTK_OBJECT(pc->cl0));
 164         pc->cl0 = NULL;
 165     }
 166     if (pc->cl1) {
 167         gtk_object_destroy(GTK_OBJECT(pc->cl1));
 168         pc->cl1 = NULL;
 169     }
 170
 171     G_OBJECT_CLASS(pen_parent_class)->dispose(object);
 172 }
 173
 174 /**
 175  * Callback to initialize SPPenContext object.
 176  */
 177 static void
 178 sp_pen_context_setup(SPEventContext *ec)
 179 {
 180     SPPenContext *pc;
 181
 182     pc = SP_PEN_CONTEXT(ec);
 183
 184     if (((SPEventContextClass *) pen_parent_class)->setup) {
 185         ((SPEventContextClass *) pen_parent_class)->setup(ec);
 186     }
 187
 188     /* Pen indicators */
 189     pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 190                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 191     pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 192                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 193     pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 194     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
 195     pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 196     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
 197
 198     sp_canvas_item_hide(pc->c0);
 199     sp_canvas_item_hide(pc->c1);
 200     sp_canvas_item_hide(pc->cl0);
 201     sp_canvas_item_hide(pc->cl1);
 202
 203     sp_event_context_read(ec, "mode");
 204
 205     pc->anchor_statusbar = false;
 206
 207     if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
 208         ec->enableSelectionCue();
 209     }
 210 }
 211
 212 static void
 213 pen_cancel (SPPenContext *const pc)
 214 {
 215     pc->state = SP_PEN_CONTEXT_STOP;
 216     spdc_reset_colors(pc);
 217     sp_canvas_item_hide(pc->c0);
 218     sp_canvas_item_hide(pc->c1);
 219     sp_canvas_item_hide(pc->cl0);
 220     sp_canvas_item_hide(pc->cl1);
 221     pc->_message_context->clear();
 222     pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
 223
 224     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
 225 }
 226
 227 /**
 228  * Finalization callback.
 229  */
 230 static void
 231 sp_pen_context_finish(SPEventContext *ec)
 232 {
 233     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 234
 235     if (pc->npoints != 0) {
 236         pen_cancel (pc);
 237     }
 238
 239     if (((SPEventContextClass *) pen_parent_class)->finish) {
 240         ((SPEventContextClass *) pen_parent_class)->finish(ec);
 241     }
 242 }
 243
 244 /**
 245  * Callback that sets key to value in pen context.
 246  */
 247 static void
 248 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 249 {
 250     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 251
 252     if (!strcmp(key, "mode")) {
 253         if ( val && !strcmp(val, "drag") ) {
 254             pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
 255         } else {
 256             pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 257         }
 258     }
 259 }
 260
 261 /**
 262  * Snaps new node relative to the previous node.
 263  */
 264 static void
 265 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
 266 {
 267     if (pc->npoints > 0) {
 268         spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
 269     }
 270
 271     spdc_endpoint_snap_free(pc, p, state);
 272 }
 273
 274 /**
 275  * Snaps new node's handle relative to the new node.
 276  */
 277 static void
 278 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
 279 {
 280     g_return_if_fail(( pc->npoints == 2 ||
 281                        pc->npoints == 5   ));
 282
 283     spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
 284     spdc_endpoint_snap_free(pc, p, state);
 285 }
 286
 287 /**
 288  * Callback to handle all pen events.
 289  */
 290 static gint
 291 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
 292 {
 293     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 294
 295     gint ret = FALSE;
 296
 297     switch (event->type) {
 298         case GDK_BUTTON_PRESS:
 299             ret = pen_handle_button_press(pc, event->button);
 300             break;
 301
 302         case GDK_MOTION_NOTIFY:
 303             ret = pen_handle_motion_notify(pc, event->motion);
 304             break;
 305
 306         case GDK_BUTTON_RELEASE:
 307             ret = pen_handle_button_release(pc, event->button);
 308             break;
 309
 310         case GDK_2BUTTON_PRESS:
 311             ret = pen_handle_2button_press(pc, event->button);
 312             break;
 313
 314         case GDK_KEY_PRESS:
 315             ret = pen_handle_key_press(pc, event);
 316             break;
 317
 318         default:
 319             break;
 320     }
 321
 322     if (!ret) {
 323         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 324             = ((SPEventContextClass *) pen_parent_class)->root_handler;
 325         if (parent_root_handler) {
 326             ret = parent_root_handler(ec, event);
 327         }
 328     }
 329
 330     return ret;
 331 }
 332
 333 /**
 334  * Handle mouse button press event.
 335  */
 336 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 337 {
 338     if (pc->events_disabled) {
 339         // skip event processing if events are disabled
 340         return FALSE;
 341     }
 342
 343     SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
 344     SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 345     NR::Point const event_w(bevent.x, bevent.y);
 346     NR::Point const event_dt(desktop->w2d(event_w));
 347
 348     gint ret = FALSE;
 349     if (bevent.button == 1) {
 350
 351         if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 352             return TRUE;
 353         }
 354
 355         pen_drag_origin_w = event_w;
 356         pen_within_tolerance = true;
 357
 358         /* Test whether we hit any anchor. */
 359         SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
 360
 361         switch (pc->mode) {
 362             case SP_PEN_CONTEXT_MODE_CLICK:
 363                 /* In click mode we add point on release */
 364                 switch (pc->state) {
 365                     case SP_PEN_CONTEXT_POINT:
 366                     case SP_PEN_CONTEXT_CONTROL:
 367                     case SP_PEN_CONTEXT_CLOSE:
 368                         break;
 369                     case SP_PEN_CONTEXT_STOP:
 370                         /* This is allowed, if we just cancelled curve */
 371                         pc->state = SP_PEN_CONTEXT_POINT;
 372                         break;
 373                     default:
 374                         break;
 375                 }
 376                 break;
 377             case SP_PEN_CONTEXT_MODE_DRAG:
 378                 switch (pc->state) {
 379                     case SP_PEN_CONTEXT_STOP:
 380                         /* This is allowed, if we just cancelled curve */
 381                     case SP_PEN_CONTEXT_POINT:
 382                         if (pc->npoints == 0) {
 383
 384                             /* Set start anchor */
 385                             pc->sa = anchor;
 386                             NR::Point p;
 387                             if (anchor) {
 388
 389                                 /* Adjust point to anchor if needed */
 390                                 p = anchor->dp;
 391                                 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
 392
 393                             } else {
 394
 395                                 // This is the first click of a new curve; deselect item so that
 396                                 // this curve is not combined with it (unless it is drawn from its
 397                                 // anchor, which is handled by the sibling branch above)
 398                                 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
 399                                 if (!(bevent.state & GDK_SHIFT_MASK)) {
 400
 401                                     selection->clear();
 402                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
 403
 404                                 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
 405
 406                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
 407                                 }
 408
 409                                 /* Create green anchor */
 410                                 p = event_dt;
 411                                 spdc_endpoint_snap(pc, p, bevent.state);
 412                                 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
 413                             }
 414                             spdc_pen_set_initial_point(pc, p);
 415                         } else {
 416
 417                             /* Set end anchor */
 418                             pc->ea = anchor;
 419                             NR::Point p;
 420                             if (anchor) {
 421
 422                                 p = anchor->dp;
 423                                 // we hit an anchor, will finish the curve (either with or without closing)
 424                                 // in release handler
 425                                 pc->state = SP_PEN_CONTEXT_CLOSE;
 426
 427                                 if (pc->green_anchor && pc->green_anchor->active) {
 428                                     // we clicked on the current curve start, so close it even if
 429                                     // we drag a handle away from it
 430                                     dc->green_closed = TRUE;
 431                                 }
 432                                 ret = TRUE;
 433                                 break;
 434
 435                             } else {
 436
 437                                 p = event_dt;
 438                                 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
 439                                 spdc_pen_set_subsequent_point(pc, p, true);
 440                             }
 441
 442                         }
 443                         pc->state = SP_PEN_CONTEXT_CONTROL;
 444                         ret = TRUE;
 445                         break;
 446                     case SP_PEN_CONTEXT_CONTROL:
 447                         g_warning("Button down in CONTROL state");
 448                         break;
 449                     case SP_PEN_CONTEXT_CLOSE:
 450                         g_warning("Button down in CLOSE state");
 451                         break;
 452                     default:
 453                         break;
 454                 }
 455                 break;
 456             default:
 457                 break;
 458         }
 459     } else if (bevent.button == 3) {
 460         if (pc->npoints != 0) {
 461
 462             spdc_pen_finish_segment(pc, event_dt, bevent.state);
 463             if (pc->green_closed) {
 464                 // finishing at the start anchor, close curve
 465                 spdc_pen_finish(pc, TRUE);
 466             } else {
 467                 // finishing at some other anchor, finish curve but not close
 468                 spdc_pen_finish(pc, FALSE);
 469             }
 470
 471             ret = TRUE;
 472         }
 473     }
 474
 475     return ret;
 476 }
 477
 478 /**
 479  * Handle motion_notify event.
 480  */
 481 static gint
 482 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
 483 {
 484     gint ret = FALSE;
 485
 486     if (mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 487         // allow middle-button scrolling
 488         return FALSE;
 489     }
 490
 491     if (pc->events_disabled) {
 492         // skip motion events if pen events are disabled
 493         return FALSE;
 494     }
 495
 496     NR::Point const event_w(mevent.x,
 497                             mevent.y);
 498     if (pen_within_tolerance) {
 499         gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
 500                                                                "value", 0, 0, 100);
 501         if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
 502             return FALSE;   // Do not drag if we're within tolerance from origin.
 503         }
 504     }
 505     // Once the user has moved farther than tolerance from the original location
 506     // (indicating they intend to move the object, not click), then always process the
 507     // motion notify coordinates as given (no snapping back to origin)
 508     pen_within_tolerance = false;
 509
 510     SPDesktop *const dt = pc->desktop;
 511     if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab ) {
 512         /* Grab mouse, so release will not pass unnoticed */
 513         pc->grab = SP_CANVAS_ITEM(dt->acetate);
 514         sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK   |
 515                                         GDK_BUTTON_RELEASE_MASK |
 516                                         GDK_POINTER_MOTION_MASK  ),
 517                             NULL, mevent.time);
 518     }
 519
 520     /* Find desktop coordinates */
 521     NR::Point p = dt->w2d(event_w);
 522
 523     /* Test, whether we hit any anchor */
 524     SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 525
 526     switch (pc->mode) {
 527         case SP_PEN_CONTEXT_MODE_CLICK:
 528             switch (pc->state) {
 529                 case SP_PEN_CONTEXT_POINT:
 530                     if ( pc->npoints != 0 ) {
 531                         /* Only set point, if we are already appending */
 532                         spdc_endpoint_snap(pc, p, mevent.state);
 533                         spdc_pen_set_subsequent_point(pc, p, true);
 534                         ret = TRUE;
 535                     }
 536                     break;
 537                 case SP_PEN_CONTEXT_CONTROL:
 538                 case SP_PEN_CONTEXT_CLOSE:
 539                     /* Placing controls is last operation in CLOSE state */
 540                     spdc_endpoint_snap(pc, p, mevent.state);
 541                     spdc_pen_set_ctrl(pc, p, mevent.state);
 542                     ret = TRUE;
 543                     break;
 544                 case SP_PEN_CONTEXT_STOP:
 545                     /* This is perfectly valid */
 546                     break;
 547                 default:
 548                     break;
 549             }
 550             break;
 551         case SP_PEN_CONTEXT_MODE_DRAG:
 552             switch (pc->state) {
 553                 case SP_PEN_CONTEXT_POINT:
 554                     if ( pc->npoints > 0 ) {
 555                         /* Only set point, if we are already appending */
 556
 557                         if (!anchor) {   /* Snap node only if not hitting anchor */
 558                             spdc_endpoint_snap(pc, p, mevent.state);
 559                         }
 560
 561                         spdc_pen_set_subsequent_point(pc, p, !anchor);
 562
 563                         if (anchor && !pc->anchor_statusbar) {
 564                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
 565                             pc->anchor_statusbar = true;
 566                         } else if (!anchor && pc->anchor_statusbar) {
 567                             pc->_message_context->clear();
 568                             pc->anchor_statusbar = false;
 569                         }
 570
 571                         ret = TRUE;
 572                     } else {
 573                         if (anchor && !pc->anchor_statusbar) {
 574                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
 575                             pc->anchor_statusbar = true;
 576                         } else if (!anchor && pc->anchor_statusbar) {
 577                             pc->_message_context->clear();
 578                             pc->anchor_statusbar = false;
 579                         }
 580                     }
 581                     break;
 582                 case SP_PEN_CONTEXT_CONTROL:
 583                 case SP_PEN_CONTEXT_CLOSE:
 584                     /* Placing controls is last operation in CLOSE state */
 585
 586                     // snap the handle
 587                     spdc_endpoint_snap_handle(pc, p, mevent.state);
 588
 589                     spdc_pen_set_ctrl(pc, p, mevent.state);
 590                     ret = TRUE;
 591                     break;
 592                 case SP_PEN_CONTEXT_STOP:
 593                     /* This is perfectly valid */
 594                     break;
 595                 default:
 596                     break;
 597             }
 598             break;
 599         default:
 600             break;
 601     }
 602     return ret;
 603 }
 604
 605 /**
 606  * Handle mouse button release event.
 607  */
 608 static gint
 609 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
 610 {
 611     if (pc->events_disabled) {
 612         // skip event processing if events are disabled
 613         return FALSE;
 614     }
 615
 616     gint ret = FALSE;
 617     if ( revent.button == 1 ) {
 618
 619         SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
 620
 621         NR::Point const event_w(revent.x,
 622                                 revent.y);
 623         /* Find desktop coordinates */
 624         NR::Point p = pc->desktop->w2d(event_w);
 625
 626         /* Test whether we hit any anchor. */
 627         SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 628
 629         switch (pc->mode) {
 630             case SP_PEN_CONTEXT_MODE_CLICK:
 631                 switch (pc->state) {
 632                     case SP_PEN_CONTEXT_POINT:
 633                         if ( pc->npoints == 0 ) {
 634                             /* Start new thread only with button release */
 635                             if (anchor) {
 636                                 p = anchor->dp;
 637                             }
 638                             pc->sa = anchor;
 639                             spdc_pen_set_initial_point(pc, p);
 640                         } else {
 641                             /* Set end anchor here */
 642                             pc->ea = anchor;
 643                             if (anchor) {
 644                                 p = anchor->dp;
 645                             }
 646                         }
 647                         pc->state = SP_PEN_CONTEXT_CONTROL;
 648                         ret = TRUE;
 649                         break;
 650                     case SP_PEN_CONTEXT_CONTROL:
 651                         /* End current segment */
 652                         spdc_endpoint_snap(pc, p, revent.state);
 653                         spdc_pen_finish_segment(pc, p, revent.state);
 654                         pc->state = SP_PEN_CONTEXT_POINT;
 655                         ret = TRUE;
 656                         break;
 657                     case SP_PEN_CONTEXT_CLOSE:
 658                         /* End current segment */
 659                         if (!anchor) {   /* Snap node only if not hitting anchor */
 660                             spdc_endpoint_snap(pc, p, revent.state);
 661                         }
 662                         spdc_pen_finish_segment(pc, p, revent.state);
 663                         spdc_pen_finish(pc, TRUE);
 664                         pc->state = SP_PEN_CONTEXT_POINT;
 665                         ret = TRUE;
 666                         break;
 667                     case SP_PEN_CONTEXT_STOP:
 668                         /* This is allowed, if we just cancelled curve */
 669                         pc->state = SP_PEN_CONTEXT_POINT;
 670                         ret = TRUE;
 671                         break;
 672                     default:
 673                         break;
 674                 }
 675                 break;
 676             case SP_PEN_CONTEXT_MODE_DRAG:
 677                 switch (pc->state) {
 678                     case SP_PEN_CONTEXT_POINT:
 679                     case SP_PEN_CONTEXT_CONTROL:
 680                         spdc_endpoint_snap(pc, p, revent.state);
 681                         spdc_pen_finish_segment(pc, p, revent.state);
 682                         break;
 683                     case SP_PEN_CONTEXT_CLOSE:
 684                         spdc_endpoint_snap(pc, p, revent.state);
 685                         spdc_pen_finish_segment(pc, p, revent.state);
 686                         if (pc->green_closed) {
 687                             // finishing at the start anchor, close curve
 688                             spdc_pen_finish(pc, TRUE);
 689                         } else {
 690                             // finishing at some other anchor, finish curve but not close
 691                             spdc_pen_finish(pc, FALSE);
 692                         }
 693                         break;
 694                     case SP_PEN_CONTEXT_STOP:
 695                         /* This is allowed, if we just cancelled curve */
 696                         break;
 697                     default:
 698                         break;
 699                 }
 700                 pc->state = SP_PEN_CONTEXT_POINT;
 701                 ret = TRUE;
 702                 break;
 703             default:
 704                 break;
 705         }
 706
 707         if (pc->grab) {
 708             /* Release grab now */
 709             sp_canvas_item_ungrab(pc->grab, revent.time);
 710             pc->grab = NULL;
 711         }
 712
 713         ret = TRUE;
 714
 715         dc->green_closed = FALSE;
 716     }
 717
 718     return ret;
 719 }
 720
 721 static gint
 722 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 723 {
 724     gint ret = FALSE;
 725     if (pc->npoints != 0 && bevent.button != 2) {
 726         spdc_pen_finish(pc, FALSE);
 727         ret = TRUE;
 728     }
 729     return ret;
 730 }
 731
 732 void
 733 pen_redraw_all (SPPenContext *const pc)
 734 {
 735     // green
 736     if (pc->green_bpaths) {
 737         // remove old piecewise green canvasitems
 738         while (pc->green_bpaths) {
 739             gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 740             pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 741         }
 742         // one canvas bpath for all of green_curve
 743         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
 744         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 745         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
 746
 747         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
 748     }
 749
 750     if (pc->green_anchor)
 751         SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
 752
 753     sp_curve_reset(pc->red_curve);
 754     sp_curve_moveto(pc->red_curve, pc->p[0]);
 755     sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
 756     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
 757
 758     // handles
 759     if (pc->p[0] != pc->p[1]) {
 760         SP_CTRL(pc->c1)->moveto(pc->p[1]);
 761         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
 762         sp_canvas_item_show (pc->c1);
 763         sp_canvas_item_show (pc->cl1);
 764     } else {
 765         sp_canvas_item_hide (pc->c1);
 766         sp_canvas_item_hide (pc->cl1);
 767     }
 768
 769     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 770     if (bpath) {
 771         if (bpath->code == NR_CURVETO && NR::Point(bpath->x2, bpath->y2) != pc->p[0]) {
 772             SP_CTRL(pc->c0)->moveto(NR::Point(bpath->x2, bpath->y2));
 773             sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), NR::Point(bpath->x2, bpath->y2), pc->p[0]);
 774             sp_canvas_item_show (pc->c0);
 775             sp_canvas_item_show (pc->cl0);
 776         } else {
 777             sp_canvas_item_hide (pc->c0);
 778             sp_canvas_item_hide (pc->cl0);
 779         }
 780     }
 781 }
 782
 783 void
 784 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
 785 {
 786     if (pc->npoints != 5)
 787         return;
 788
 789     // green
 790     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 791     if (bpath) {
 792         if (bpath->code == NR_CURVETO) {
 793             bpath->x2 += x;
 794             bpath->y2 += y;
 795         }
 796         bpath->x3 += x;
 797         bpath->y3 += y;
 798     } else {
 799         // start anchor too
 800         if (pc->green_anchor) {
 801             pc->green_anchor->dp += NR::Point(x, y);
 802         }
 803     }
 804
 805     // red
 806     pc->p[0] += NR::Point(x, y);
 807     pc->p[1] += NR::Point(x, y);
 808     pen_redraw_all(pc);
 809 }
 810
 811 void
 812 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
 813 {
 814     pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
 815 }
 816
 817 void
 818 pen_lastpoint_tocurve (SPPenContext *const pc)
 819 {
 820     if (pc->npoints != 5)
 821         return;
 822
 823     // red
 824     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 825     if (bpath && bpath->code == NR_CURVETO) {
 826         pc->p[1] = pc->p[0] + (NR::Point(bpath->x3, bpath->y3) - NR::Point(bpath->x2, bpath->y2));
 827     } else {
 828         pc->p[1] = pc->p[0] + (pc->p[3] - pc->p[0])*(1/3);
 829     }
 830
 831     pen_redraw_all(pc);
 832 }
 833
 834 void
 835 pen_lastpoint_toline (SPPenContext *const pc)
 836 {
 837     if (pc->npoints != 5)
 838         return;
 839
 840     pc->p[1] = pc->p[0];
 841
 842     pen_redraw_all(pc);
 843 }
 844
 845
 846 static gint
 847 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
 848 {
 849     gint ret = FALSE;
 850     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 851
 852     switch (get_group0_keyval (&event->key)) {
 853
 854         case GDK_Left: // move last point left
 855         case GDK_KP_Left:
 856         case GDK_KP_4:
 857             if (!MOD__CTRL) { // not ctrl
 858                 if (MOD__ALT) { // alt
 859                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
 860                     else pen_lastpoint_move_screen(pc, -1, 0); // no shift
 861                 }
 862                 else { // no alt
 863                     if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
 864                     else pen_lastpoint_move(pc, -nudge, 0); // no shift
 865                 }
 866                 ret = TRUE;
 867             }
 868             break;
 869         case GDK_Up: // move last point up
 870         case GDK_KP_Up:
 871         case GDK_KP_8:
 872             if (!MOD__CTRL) { // not ctrl
 873                 if (MOD__ALT) { // alt
 874                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
 875                     else pen_lastpoint_move_screen(pc, 0, 1); // no shift
 876                 }
 877                 else { // no alt
 878                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
 879                     else pen_lastpoint_move(pc, 0, nudge); // no shift
 880                 }
 881                 ret = TRUE;
 882             }
 883             break;
 884         case GDK_Right: // move last point right
 885         case GDK_KP_Right:
 886         case GDK_KP_6:
 887             if (!MOD__CTRL) { // not ctrl
 888                 if (MOD__ALT) { // alt
 889                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
 890                     else pen_lastpoint_move_screen(pc, 1, 0); // no shift
 891                 }
 892                 else { // no alt
 893                     if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
 894                     else pen_lastpoint_move(pc, nudge, 0); // no shift
 895                 }
 896                 ret = TRUE;
 897             }
 898             break;
 899         case GDK_Down: // move last point down
 900         case GDK_KP_Down:
 901         case GDK_KP_2:
 902             if (!MOD__CTRL) { // not ctrl
 903                 if (MOD__ALT) { // alt
 904                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
 905                     else pen_lastpoint_move_screen(pc, 0, -1); // no shift
 906                 }
 907                 else { // no alt
 908                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
 909                     else pen_lastpoint_move(pc, 0, -nudge); // no shift
 910                 }
 911                 ret = TRUE;
 912             }
 913             break;
 914
 915         case GDK_U:
 916         case GDK_u:
 917             if (MOD__SHIFT_ONLY) {
 918                 pen_lastpoint_tocurve(pc);
 919                 ret = TRUE;
 920             }
 921             break;
 922         case GDK_L:
 923         case GDK_l:
 924             if (MOD__SHIFT_ONLY) {
 925                 pen_lastpoint_toline(pc);
 926                 ret = TRUE;
 927             }
 928             break;
 929
 930         case GDK_Return:
 931         case GDK_KP_Enter:
 932             if (pc->npoints != 0) {
 933                 spdc_pen_finish(pc, FALSE);
 934                 ret = TRUE;
 935             }
 936             break;
 937         case GDK_Escape:
 938             if (pc->npoints != 0) {
 939                 // if drawing, cancel, otherwise pass it up for deselecting
 940                 pen_cancel (pc);
 941                 ret = TRUE;
 942             }
 943             break;
 944         case GDK_z:
 945         case GDK_Z:
 946             if (MOD__CTRL_ONLY && pc->npoints != 0) {
 947                 // if drawing, cancel, otherwise pass it up for undo
 948                 pen_cancel (pc);
 949                 ret = TRUE;
 950             }
 951             break;
 952         case GDK_BackSpace:
 953         case GDK_Delete:
 954         case GDK_KP_Delete:
 955             if (sp_curve_is_empty(pc->green_curve)) {
 956                 pen_cancel (pc);
 957                 ret = TRUE;
 958             } else {
 959                 /* Reset red curve */
 960                 sp_curve_reset(pc->red_curve);
 961                 /* Destroy topmost green bpath */
 962                 if (pc->green_bpaths) {
 963                     if (pc->green_bpaths->data)
 964                         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 965                     pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 966                 }
 967                 /* Get last segment */
 968                 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
 969                 gint const e = SP_CURVE_LENGTH(pc->green_curve);
 970                 if ( e < 2 ) {
 971                     g_warning("Green curve length is %d", e);
 972                     break;
 973                 }
 974                 pc->p[0] = p[e - 2].c(3);
 975                 if (p[e - 1].code == NR_CURVETO) {
 976                     pc->p[1] = p[e - 1].c(1);
 977                 } else {
 978                     pc->p[1] = pc->p[0];
 979                 }
 980                 NR::Point const pt(( pc->npoints < 4
 981                                      ? p[e - 1].c(3)
 982                                      : pc->p[3] ));
 983                 pc->npoints = 2;
 984                 sp_curve_backspace(pc->green_curve);
 985                 sp_canvas_item_hide(pc->c0);
 986                 sp_canvas_item_hide(pc->c1);
 987                 sp_canvas_item_hide(pc->cl0);
 988                 sp_canvas_item_hide(pc->cl1);
 989                 pc->state = SP_PEN_CONTEXT_POINT;
 990                 spdc_pen_set_subsequent_point(pc, pt, true);
 991                 ret = TRUE;
 992             }
 993             break;
 994         default:
 995             break;
 996     }
 997     return ret;
 998 }
 999
1000 static void
1001 spdc_reset_colors(SPPenContext *pc)
1002 {
1003     /* Red */
1004     sp_curve_reset(pc->red_curve);
1005     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1006     /* Blue */
1007     sp_curve_reset(pc->blue_curve);
1008     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1009     /* Green */
1010     while (pc->green_bpaths) {
1011         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1012         pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1013     }
1014     sp_curve_reset(pc->green_curve);
1015     if (pc->green_anchor) {
1016         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1017     }
1018     pc->sa = NULL;
1019     pc->ea = NULL;
1020     pc->npoints = 0;
1021     pc->red_curve_is_valid = false;
1022 }
1023
1024
1025 static void
1026 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1027 {
1028     g_assert( pc->npoints == 0 );
1029
1030     pc->p[0] = p;
1031     pc->p[1] = p;
1032     pc->npoints = 2;
1033     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1034
1035     sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1036 }
1037
1038 static void
1039 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1040 {
1041     g_assert( pc->npoints != 0 );
1042     /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1043
1044     pc->p[2] = p;
1045     pc->p[3] = p;
1046     pc->p[4] = p;
1047     pc->npoints = 5;
1048     sp_curve_reset(pc->red_curve);
1049     sp_curve_moveto(pc->red_curve, pc->p[0]);
1050     bool is_curve;
1051     if ( (pc->onlycurves)
1052          || ( pc->p[1] != pc->p[0] ) )
1053     {
1054         sp_curve_curveto(pc->red_curve, pc->p[1], p, p);
1055         is_curve = true;
1056     } else {
1057         sp_curve_lineto(pc->red_curve, p);
1058         is_curve = false;
1059     }
1060
1061     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1062
1063     if (statusbar) {
1064         // status text
1065         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1066         NR::Point rel = p - pc->p[0];
1067         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1068         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1069         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1070             angle = angle_to_compass (angle);
1071         pc->_message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>%s</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path"), is_curve? "Curve segment" : "Line segment", angle, dist->str);
1072         g_string_free(dist, FALSE);
1073     }
1074 }
1075
1076 static void
1077 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1078 {
1079     sp_canvas_item_show(pc->c1);
1080     sp_canvas_item_show(pc->cl1);
1081
1082     if ( pc->npoints == 2 ) {
1083         pc->p[1] = p;
1084         sp_canvas_item_hide(pc->c0);
1085         sp_canvas_item_hide(pc->cl0);
1086         SP_CTRL(pc->c1)->moveto(pc->p[1]);
1087         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1088
1089         // status text
1090         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1091         NR::Point rel = p - pc->p[0];
1092         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1093         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1094         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1095             angle = angle_to_compass (angle);
1096         pc->_message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>Curve handle</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle"), angle, dist->str);
1097         g_string_free(dist, FALSE);
1098
1099     } else if ( pc->npoints == 5 ) {
1100         pc->p[4] = p;
1101         sp_canvas_item_show(pc->c0);
1102         sp_canvas_item_show(pc->cl0);
1103         bool is_symm = false;
1104         if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1105              ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) &&  !( state & GDK_SHIFT_MASK  ) ) ) {
1106             NR::Point delta = p - pc->p[3];
1107             pc->p[2] = pc->p[3] - delta;
1108             is_symm = true;
1109             sp_curve_reset(pc->red_curve);
1110             sp_curve_moveto(pc->red_curve, pc->p[0]);
1111             sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
1112             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1113         }
1114         SP_CTRL(pc->c0)->moveto(pc->p[2]);
1115         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1116         SP_CTRL(pc->c1)->moveto(pc->p[4]);
1117         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1118
1119         // status text
1120         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1121         NR::Point rel = p - pc->p[3];
1122         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1123         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1124         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1125             angle = angle_to_compass (angle);
1126         pc->_message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>%s</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only"), is_symm? "Curve handle, symmetric" : "Curve handle", angle, dist->str);
1127         g_string_free(dist, FALSE);
1128
1129     } else {
1130         g_warning("Something bad happened - npoints is %d", pc->npoints);
1131     }
1132 }
1133
1134 static void
1135 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const p, guint const state)
1136 {
1137     if (!sp_curve_empty(pc->red_curve)) {
1138         sp_curve_append_continuous(pc->green_curve, pc->red_curve, 0.0625);
1139         SPCurve *curve = sp_curve_copy(pc->red_curve);
1140         /// \todo fixme:
1141         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1142         sp_curve_unref(curve);
1143         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1144
1145         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1146
1147         pc->p[0] = pc->p[3];
1148         pc->p[1] = pc->p[4];
1149         pc->npoints = 2;
1150
1151         sp_curve_reset(pc->red_curve);
1152     }
1153 }
1154
1155 static void
1156 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1157 {
1158     pen_disable_events(pc);
1159
1160     SPDesktop *const desktop = pc->desktop;
1161     pc->_message_context->clear();
1162     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1163
1164     sp_curve_reset(pc->red_curve);
1165     spdc_concat_colors_and_flush(pc, closed);
1166     pc->sa = NULL;
1167     pc->ea = NULL;
1168
1169     pc->npoints = 0;
1170     pc->state = SP_PEN_CONTEXT_POINT;
1171
1172     sp_canvas_item_hide(pc->c0);
1173     sp_canvas_item_hide(pc->c1);
1174     sp_canvas_item_hide(pc->cl0);
1175     sp_canvas_item_hide(pc->cl1);
1176
1177     if (pc->green_anchor) {
1178         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1179     }
1180
1181
1182     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1183
1184     pen_enable_events(pc);
1185 }
1186
1187 static void
1188 pen_disable_events(SPPenContext *const pc) {
1189   pc->events_disabled++;
1190 }
1191
1192 static void
1193 pen_enable_events(SPPenContext *const pc) {
1194   g_return_if_fail(pc->events_disabled != 0);
1195
1196   pc->events_disabled--;
1197 }
1198
1199 /*
1200   Local Variables:
1201   mode:c++
1202   c-file-style:"stroustrup"
1203   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1204   indent-tabs-mode:nil
1205   fill-column:99
1206   End:
1207 */
1208 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :