src/node-context.cpp

   1 #define __SP_NODE_CONTEXT_C__
   2
   3 /*
   4  * Node editing context
   5  *
   6  * Authors:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   bulia byak <buliabyak@users.sf.net>
   9  *
  10  * This code is in public domain
  11  */
  12
  13 #ifdef HAVE_CONFIG_H
  14 # include "config.h"
  15 #endif
  16 #include <gdk/gdkkeysyms.h>
  17 #include "macros.h"
  18 #include <glibmm/i18n.h>
  19 #include "display/sp-canvas-util.h"
  20 #include "object-edit.h"
  21 #include "sp-path.h"
  22 #include "path-chemistry.h"
  23 #include "rubberband.h"
  24 #include "desktop.h"
  25 #include "desktop-handles.h"
  26 #include "selection.h"
  27 #include "pixmaps/cursor-node.xpm"
  28 #include "message-context.h"
  29 #include "node-context.h"
  30 #include "pixmaps/cursor-node-d.xpm"
  31 #include "prefs-utils.h"
  32 #include "xml/node-event-vector.h"
  33 #include "style.h"
  34 #include "splivarot.h"
  35 #include "shape-editor.h"
  36
  37 static void sp_node_context_class_init(SPNodeContextClass *klass);
  38 static void sp_node_context_init(SPNodeContext *node_context);
  39 static void sp_node_context_dispose(GObject *object);
  40
  41 static void sp_node_context_setup(SPEventContext *ec);
  42 static gint sp_node_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  43 static gint sp_node_context_item_handler(SPEventContext *event_context,
  44                                          SPItem *item, GdkEvent *event);
  45
  46 static SPEventContextClass *parent_class;
  47
  48 GType
  49 sp_node_context_get_type()
  50 {
  51     static GType type = 0;
  52     if (!type) {
  53         GTypeInfo info = {
  54             sizeof(SPNodeContextClass),
  55             NULL, NULL,
  56             (GClassInitFunc) sp_node_context_class_init,
  57             NULL, NULL,
  58             sizeof(SPNodeContext),
  59             4,
  60             (GInstanceInitFunc) sp_node_context_init,
  61             NULL,    /* value_table */
  62         };
  63         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPNodeContext", &info, (GTypeFlags)0);
  64     }
  65     return type;
  66 }
  67
  68 static void
  69 sp_node_context_class_init(SPNodeContextClass *klass)
  70 {
  71     GObjectClass *object_class = (GObjectClass *) klass;
  72     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  73
  74     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
  75
  76     object_class->dispose = sp_node_context_dispose;
  77
  78     event_context_class->setup = sp_node_context_setup;
  79     event_context_class->root_handler = sp_node_context_root_handler;
  80     event_context_class->item_handler = sp_node_context_item_handler;
  81 }
  82
  83 static void
  84 sp_node_context_init(SPNodeContext *node_context)
  85 {
  86     SPEventContext *event_context = SP_EVENT_CONTEXT(node_context);
  87
  88     event_context->cursor_shape = cursor_node_xpm;
  89     event_context->hot_x = 1;
  90     event_context->hot_y = 1;
  91
  92     node_context->leftalt = FALSE;
  93     node_context->rightalt = FALSE;
  94     node_context->leftctrl = FALSE;
  95     node_context->rightctrl = FALSE;
  96
  97     new (&node_context->sel_changed_connection) sigc::connection();
  98 }
  99
 100 static void
 101 sp_node_context_dispose(GObject *object)
 102 {
 103     SPNodeContext *nc = SP_NODE_CONTEXT(object);
 104     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 105
 106     ec->enableGrDrag(false);
 107
 108     nc->sel_changed_connection.disconnect();
 109     nc->sel_changed_connection.~connection();
 110
 111     delete nc->shape_editor;
 112
 113     if (nc->_node_message_context) {
 114         delete nc->_node_message_context;
 115     }
 116
 117     G_OBJECT_CLASS(parent_class)->dispose(object);
 118 }
 119
 120 static void
 121 sp_node_context_setup(SPEventContext *ec)
 122 {
 123     SPNodeContext *nc = SP_NODE_CONTEXT(ec);
 124
 125     if (((SPEventContextClass *) parent_class)->setup)
 126         ((SPEventContextClass *) parent_class)->setup(ec);
 127
 128     nc->sel_changed_connection.disconnect();
 129     nc->sel_changed_connection = sp_desktop_selection(ec->desktop)->connectChanged(sigc::bind(sigc::ptr_fun(&sp_node_context_selection_changed), (gpointer)nc));
 130
 131     Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
 132     SPItem *item = selection->singleItem();
 133
 134     nc->shape_editor = new ShapeEditor(ec->desktop);
 135
 136     nc->rb_escaped = false;
 137
 138     nc->cursor_drag = false;
 139
 140     nc->added_node = false;
 141
 142     nc->current_state = SP_NODE_CONTEXT_INACTIVE;
 143
 144     if (item) {
 145         nc->shape_editor->set_item(item);
 146     }
 147
 148     if (prefs_get_int_attribute("tools.nodes", "selcue", 0) != 0) {
 149         ec->enableSelectionCue();
 150     }
 151
 152     if (prefs_get_int_attribute("tools.nodes", "gradientdrag", 0) != 0) {
 153         ec->enableGrDrag();
 154     }
 155
 156     nc->_node_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 157
 158     nc->shape_editor->update_statusbar();
 159 }
 160
 161 /**
 162 \brief  Callback that processes the "changed" signal on the selection;
 163 destroys old and creates new nodepath and reassigns listeners to the new selected item's repr
 164 */
 165 void
 166 sp_node_context_selection_changed(Inkscape::Selection *selection, gpointer data)
 167 {
 168     SPNodeContext *nc = SP_NODE_CONTEXT(data);
 169
 170     // TODO: update ShapeEditorsCollective instead
 171     nc->shape_editor->unset_item();
 172     SPItem *item = selection->singleItem();
 173     nc->shape_editor->set_item(item);
 174
 175     nc->shape_editor->update_statusbar();
 176 }
 177
 178 void
 179 sp_node_context_show_modifier_tip(SPEventContext *event_context, GdkEvent *event)
 180 {
 181     sp_event_show_modifier_tip
 182         (event_context->defaultMessageContext(), event,
 183          _("<b>Ctrl</b>: toggle node type, snap handle angle, move hor/vert; <b>Ctrl+Alt</b>: move along handles"),
 184          _("<b>Shift</b>: toggle node selection, disable snapping, rotate both handles"),
 185          _("<b>Alt</b>: lock handle length; <b>Ctrl+Alt</b>: move along handles"));
 186 }
 187
 188
 189 static gint
 190 sp_node_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 191 {
 192     gint ret = FALSE;
 193
 194     if (((SPEventContextClass *) parent_class)->item_handler)
 195         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 196
 197     return ret;
 198 }
 199
 200 static gint
 201 sp_node_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 202 {
 203     SPDesktop *desktop = event_context->desktop;
 204     Inkscape::Selection *selection = sp_desktop_selection (desktop);
 205
 206     SPNodeContext *nc = SP_NODE_CONTEXT(event_context);
 207     double const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 208     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100); // read every time, to make prefs changes really live
 209     int const snaps = prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12);
 210     double const offset = prefs_get_double_attribute_limited("options.defaultscale", "value", 2, 0, 1000);
 211
 212     gint ret = FALSE;
 213     switch (event->type) {
 214         case GDK_BUTTON_PRESS:
 215             if (event->button.button == 1 && !event_context->space_panning) {
 216                 // save drag origin
 217                 event_context->xp = (gint) event->button.x;
 218                 event_context->yp = (gint) event->button.y;
 219                 event_context->within_tolerance = true;
 220                 nc->shape_editor->cancel_hit();
 221
 222                 if (!(event->button.state & GDK_SHIFT_MASK)) {
 223                     if (!nc->drag) {
 224                         if (nc->shape_editor->has_nodepath() && selection->single() /* && item_over */) {
 225                             // save drag origin
 226                             bool over_stroke = nc->shape_editor->is_over_stroke(NR::Point(event->button.x, event->button.y), true);
 227                             //only dragging curves
 228                             if (over_stroke) {
 229                                 ret = TRUE;
 230                                 break;
 231                             }
 232                         }
 233                     }
 234                 }
 235                 NR::Point const button_w(event->button.x,
 236                                          event->button.y);
 237                 NR::Point const button_dt(desktop->w2d(button_w));
 238                 Inkscape::Rubberband::get()->start(desktop, button_dt);
 239                 nc->current_state = SP_NODE_CONTEXT_INACTIVE;
 240                 desktop->updateNow();
 241                 ret = TRUE;
 242             }
 243             break;
 244         case GDK_MOTION_NOTIFY:
 245             if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {
 246
 247                 if ( event_context->within_tolerance
 248                      && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 249                      && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 250                     break; // do not drag if we're within tolerance from origin
 251                 }
 252
 253                 // The path went away while dragging; throw away any further motion
 254                 // events until the mouse pointer is released.
 255
 256                 if (nc->shape_editor->hits_curve() && !nc->shape_editor->has_nodepath()) {
 257                   break;
 258                 }
 259
 260                 // Once the user has moved farther than tolerance from the original location
 261                 // (indicating they intend to move the object, not click), then always process the
 262                 // motion notify coordinates as given (no snapping back to origin)
 263                 event_context->within_tolerance = false;
 264
 265                 // Once we determine what the user is doing (dragging either a node or the
 266                 // selection rubberband), make sure we continue to perform that operation
 267                 // until the mouse pointer is lifted.
 268                 if (nc->current_state == SP_NODE_CONTEXT_INACTIVE) {
 269                     if (nc->shape_editor->hits_curve() && nc->shape_editor->has_nodepath()) {
 270                         nc->current_state = SP_NODE_CONTEXT_NODE_DRAGGING;
 271                     } else {
 272                         nc->current_state = SP_NODE_CONTEXT_RUBBERBAND_DRAGGING;
 273                     }
 274                 }
 275
 276                 switch (nc->current_state) {
 277                     case SP_NODE_CONTEXT_NODE_DRAGGING:
 278                         {
 279                             nc->shape_editor->curve_drag (event->motion.x, event->motion.y);
 280
 281                             gobble_motion_events(GDK_BUTTON1_MASK);
 282                             break;
 283                         }
 284                     case SP_NODE_CONTEXT_RUBBERBAND_DRAGGING:
 285                         if (Inkscape::Rubberband::get()->is_started()) {
 286                             NR::Point const motion_w(event->motion.x,
 287                                                 event->motion.y);
 288                             NR::Point const motion_dt(desktop->w2d(motion_w));
 289                             Inkscape::Rubberband::get()->move(motion_dt);
 290                         }
 291                         break;
 292                 }
 293
 294                 nc->drag = TRUE;
 295                 ret = TRUE;
 296             } else {
 297                 if (!nc->shape_editor->has_nodepath() || selection->singleItem() == NULL) {
 298                     break;
 299                 }
 300
 301                 bool over_stroke = false;
 302                 over_stroke = nc->shape_editor->is_over_stroke(NR::Point(event->motion.x, event->motion.y), false);
 303
 304                 if (nc->cursor_drag && !over_stroke) {
 305                     event_context->cursor_shape = cursor_node_xpm;
 306                     event_context->hot_x = 1;
 307                     event_context->hot_y = 1;
 308                     sp_event_context_update_cursor(event_context);
 309                     nc->cursor_drag = false;
 310                 } else if (!nc->cursor_drag && over_stroke) {
 311                     event_context->cursor_shape = cursor_node_d_xpm;
 312                     event_context->hot_x = 1;
 313                     event_context->hot_y = 1;
 314                     sp_event_context_update_cursor(event_context);
 315                     nc->cursor_drag = true;
 316                 }
 317             }
 318             break;
 319
 320         case GDK_2BUTTON_PRESS:
 321         case GDK_BUTTON_RELEASE:
 322             if ( (event->button.button == 1) && (!nc->drag) && !event_context->space_panning) {
 323                 // find out clicked item, disregarding groups, honoring Alt
 324                 SPItem *item_clicked = sp_event_context_find_item (desktop,
 325                         NR::Point(event->button.x, event->button.y),
 326                         (event->button.state & GDK_MOD1_MASK) && !(event->button.state & GDK_CONTROL_MASK), TRUE);
 327
 328                 event_context->xp = event_context->yp = 0;
 329
 330                 bool over_stroke = false;
 331                 if (nc->shape_editor->has_nodepath()) {
 332                     over_stroke = nc->shape_editor->is_over_stroke(NR::Point(event->button.x, event->button.y), false);
 333                 }
 334
 335                 if (item_clicked || over_stroke) {
 336                     if (over_stroke || nc->added_node) {
 337                         switch (event->type) {
 338                             case GDK_BUTTON_RELEASE:
 339                                 if (event->button.state & GDK_CONTROL_MASK && event->button.state & GDK_MOD1_MASK) {
 340                                     //add a node
 341                                     nc->shape_editor->add_node_near_point();
 342                                 } else {
 343                                     if (nc->added_node) { // we just received double click, ignore release
 344                                         nc->added_node = false;
 345                                         break;
 346                                     }
 347                                     //select the segment
 348                                     if (event->button.state & GDK_SHIFT_MASK) {
 349                                         nc->shape_editor->select_segment_near_point(true);
 350                                     } else {
 351                                         nc->shape_editor->select_segment_near_point(false);
 352                                     }
 353                                     desktop->updateNow();
 354                                 }
 355                                 break;
 356                             case GDK_2BUTTON_PRESS:
 357                                 //add a node
 358                                 nc->shape_editor->add_node_near_point();
 359                                 nc->added_node = true;
 360                                 break;
 361                             default:
 362                                 break;
 363                         }
 364                     } else if (event->button.state & GDK_SHIFT_MASK) {
 365                         selection->toggle(item_clicked);
 366                         desktop->updateNow();
 367                     } else {
 368                         selection->set(item_clicked);
 369                         desktop->updateNow();
 370                     }
 371                     ret = TRUE;
 372                     break;
 373                 }
 374             }
 375             if (event->type == GDK_BUTTON_RELEASE) {
 376                 event_context->xp = event_context->yp = 0;
 377                 if (event->button.button == 1) {
 378                     NR::Maybe<NR::Rect> b = Inkscape::Rubberband::get()->getRectangle();
 379
 380                     if (nc->shape_editor->hits_curve() && !event_context->within_tolerance) { //drag curve
 381                         nc->shape_editor->finish_drag();
 382                     } else if (b && !event_context->within_tolerance) { // drag to select
 383                         nc->shape_editor->select_rect(*b, event->button.state & GDK_SHIFT_MASK);
 384                     } else {
 385                         if (!(nc->rb_escaped)) { // unless something was cancelled
 386                             if (nc->shape_editor->has_selection())
 387                                 nc->shape_editor->deselect();
 388                             else
 389                                 sp_desktop_selection(desktop)->clear();
 390                         }
 391                     }
 392                     ret = TRUE;
 393                     Inkscape::Rubberband::get()->stop();
 394                     desktop->updateNow();
 395                     nc->rb_escaped = false;
 396                     nc->drag = FALSE;
 397                     nc->shape_editor->cancel_hit();
 398                     nc->current_state = SP_NODE_CONTEXT_INACTIVE;
 399                 }
 400             }
 401             break;
 402         case GDK_KEY_PRESS:
 403             switch (get_group0_keyval(&event->key)) {
 404                 case GDK_Insert:
 405                 case GDK_KP_Insert:
 406                     // with any modifiers
 407                     nc->shape_editor->add_node();
 408                     ret = TRUE;
 409                     break;
 410                 case GDK_Delete:
 411                 case GDK_KP_Delete:
 412                 case GDK_BackSpace:
 413                     if (MOD__CTRL_ONLY) {
 414                         nc->shape_editor->delete_nodes();
 415                     } else {
 416                         nc->shape_editor->delete_nodes_preserving_shape();
 417                     }
 418                     ret = TRUE;
 419                     break;
 420                 case GDK_C:
 421                 case GDK_c:
 422                     if (MOD__SHIFT_ONLY) {
 423                         nc->shape_editor->set_node_type(Inkscape::NodePath::NODE_CUSP);
 424                         ret = TRUE;
 425                     }
 426                     break;
 427                 case GDK_S:
 428                 case GDK_s:
 429                     if (MOD__SHIFT_ONLY) {
 430                         nc->shape_editor->set_node_type(Inkscape::NodePath::NODE_SMOOTH);
 431                         ret = TRUE;
 432                     }
 433                     break;
 434                 case GDK_Y:
 435                 case GDK_y:
 436                     if (MOD__SHIFT_ONLY) {
 437                         nc->shape_editor->set_node_type(Inkscape::NodePath::NODE_SYMM);
 438                         ret = TRUE;
 439                     }
 440                     break;
 441                 case GDK_B:
 442                 case GDK_b:
 443                     if (MOD__SHIFT_ONLY) {
 444                         nc->shape_editor->break_at_nodes();
 445                         ret = TRUE;
 446                     }
 447                     break;
 448                 case GDK_J:
 449                 case GDK_j:
 450                     if (MOD__SHIFT_ONLY) {
 451                         nc->shape_editor->join_nodes();
 452                         ret = TRUE;
 453                     }
 454                     break;
 455                 case GDK_D:
 456                 case GDK_d:
 457                     if (MOD__SHIFT_ONLY) {
 458                         nc->shape_editor->duplicate_nodes();
 459                         ret = TRUE;
 460                     }
 461                     break;
 462                 case GDK_L:
 463                 case GDK_l:
 464                     if (MOD__SHIFT_ONLY) {
 465                         nc->shape_editor->set_type_of_segments(NR_LINETO);
 466                         ret = TRUE;
 467                     }
 468                     break;
 469                 case GDK_U:
 470                 case GDK_u:
 471                     if (MOD__SHIFT_ONLY) {
 472                         nc->shape_editor->set_type_of_segments(NR_CURVETO);
 473                         ret = TRUE;
 474                     }
 475                     break;
 476                 case GDK_R:
 477                 case GDK_r:
 478                     if (MOD__SHIFT_ONLY) {
 479                         // FIXME: add top panel button
 480                         sp_selected_path_reverse();
 481                         ret = TRUE;
 482                     }
 483                     break;
 484                 case GDK_Left: // move selection left
 485                 case GDK_KP_Left:
 486                 case GDK_KP_4:
 487                     if (!MOD__CTRL) { // not ctrl
 488                         if (MOD__ALT) { // alt
 489                             if (MOD__SHIFT) nc->shape_editor->move_nodes_screen(-10, 0); // shift
 490                             else nc->shape_editor->move_nodes_screen(-1, 0); // no shift
 491                         }
 492                         else { // no alt
 493                             if (MOD__SHIFT) nc->shape_editor->move_nodes(-10*nudge, 0); // shift
 494                             else nc->shape_editor->move_nodes(-nudge, 0); // no shift
 495                         }
 496                         ret = TRUE;
 497                     }
 498                     break;
 499                 case GDK_Up: // move selection up
 500                 case GDK_KP_Up:
 501                 case GDK_KP_8:
 502                     if (!MOD__CTRL) { // not ctrl
 503                         if (MOD__ALT) { // alt
 504                             if (MOD__SHIFT) nc->shape_editor->move_nodes_screen(0, 10); // shift
 505                             else nc->shape_editor->move_nodes_screen(0, 1); // no shift
 506                         }
 507                         else { // no alt
 508                             if (MOD__SHIFT) nc->shape_editor->move_nodes(0, 10*nudge); // shift
 509                             else nc->shape_editor->move_nodes(0, nudge); // no shift
 510                         }
 511                         ret = TRUE;
 512                     }
 513                     break;
 514                 case GDK_Right: // move selection right
 515                 case GDK_KP_Right:
 516                 case GDK_KP_6:
 517                     if (!MOD__CTRL) { // not ctrl
 518                         if (MOD__ALT) { // alt
 519                             if (MOD__SHIFT) nc->shape_editor->move_nodes_screen(10, 0); // shift
 520                             else nc->shape_editor->move_nodes_screen(1, 0); // no shift
 521                         }
 522                         else { // no alt
 523                             if (MOD__SHIFT) nc->shape_editor->move_nodes(10*nudge, 0); // shift
 524                             else nc->shape_editor->move_nodes(nudge, 0); // no shift
 525                         }
 526                         ret = TRUE;
 527                     }
 528                     break;
 529                 case GDK_Down: // move selection down
 530                 case GDK_KP_Down:
 531                 case GDK_KP_2:
 532                     if (!MOD__CTRL) { // not ctrl
 533                         if (MOD__ALT) { // alt
 534                             if (MOD__SHIFT) nc->shape_editor->move_nodes_screen(0, -10); // shift
 535                             else nc->shape_editor->move_nodes_screen(0, -1); // no shift
 536                         }
 537                         else { // no alt
 538                             if (MOD__SHIFT) nc->shape_editor->move_nodes(0, -10*nudge); // shift
 539                             else nc->shape_editor->move_nodes(0, -nudge); // no shift
 540                         }
 541                         ret = TRUE;
 542                     }
 543                     break;
 544                 case GDK_Escape:
 545                 {
 546                     NR::Maybe<NR::Rect> const b = Inkscape::Rubberband::get()->getRectangle();
 547                     if (b) {
 548                         Inkscape::Rubberband::get()->stop();
 549                         nc->current_state = SP_NODE_CONTEXT_INACTIVE;
 550                         nc->rb_escaped = true;
 551                     } else {
 552                         if (nc->shape_editor->has_selection()) {
 553                             nc->shape_editor->deselect();
 554                         } else {
 555                             sp_desktop_selection(desktop)->clear();
 556                         }
 557                     }
 558                     ret = TRUE;
 559                     break;
 560                 }
 561
 562                 case GDK_bracketleft:
 563                     if ( MOD__CTRL && !MOD__ALT && ( snaps != 0 ) ) {
 564                         if (nc->leftctrl)
 565                             nc->shape_editor->rotate_nodes (M_PI/snaps, -1, false);
 566                         if (nc->rightctrl)
 567                             nc->shape_editor->rotate_nodes (M_PI/snaps, 1, false);
 568                     } else if ( MOD__ALT && !MOD__CTRL ) {
 569                         if (nc->leftalt && nc->rightalt)
 570                             nc->shape_editor->rotate_nodes (1, 0, true);
 571                         else {
 572                             if (nc->leftalt)
 573                                 nc->shape_editor->rotate_nodes (1, -1, true);
 574                             if (nc->rightalt)
 575                                 nc->shape_editor->rotate_nodes (1, 1, true);
 576                         }
 577                     } else if ( snaps != 0 ) {
 578                         nc->shape_editor->rotate_nodes (M_PI/snaps, 0, false);
 579                     }
 580                     ret = TRUE;
 581                     break;
 582                 case GDK_bracketright:
 583                     if ( MOD__CTRL && !MOD__ALT && ( snaps != 0 ) ) {
 584                         if (nc->leftctrl)
 585                             nc->shape_editor->rotate_nodes (-M_PI/snaps, -1, false);
 586                         if (nc->rightctrl)
 587                             nc->shape_editor->rotate_nodes (-M_PI/snaps, 1, false);
 588                     } else if ( MOD__ALT && !MOD__CTRL ) {
 589                         if (nc->leftalt && nc->rightalt)
 590                             nc->shape_editor->rotate_nodes (-1, 0, true);
 591                         else {
 592                             if (nc->leftalt)
 593                                 nc->shape_editor->rotate_nodes (-1, -1, true);
 594                             if (nc->rightalt)
 595                                 nc->shape_editor->rotate_nodes (-1, 1, true);
 596                         }
 597                     } else if ( snaps != 0 ) {
 598                         nc->shape_editor->rotate_nodes (-M_PI/snaps, 0, false);
 599                     }
 600                     ret = TRUE;
 601                     break;
 602                 case GDK_less:
 603                 case GDK_comma:
 604                     if (MOD__CTRL) {
 605                         if (nc->leftctrl)
 606                             nc->shape_editor->scale_nodes(-offset, -1);
 607                         if (nc->rightctrl)
 608                             nc->shape_editor->scale_nodes(-offset, 1);
 609                     } else if (MOD__ALT) {
 610                         if (nc->leftalt && nc->rightalt)
 611                             nc->shape_editor->scale_nodes_screen (-1, 0);
 612                         else {
 613                             if (nc->leftalt)
 614                                 nc->shape_editor->scale_nodes_screen (-1, -1);
 615                             if (nc->rightalt)
 616                                 nc->shape_editor->scale_nodes_screen (-1, 1);
 617                         }
 618                     } else {
 619                         nc->shape_editor->scale_nodes (-offset, 0);
 620                     }
 621                     ret = TRUE;
 622                     break;
 623                 case GDK_greater:
 624                 case GDK_period:
 625                     if (MOD__CTRL) {
 626                         if (nc->leftctrl)
 627                             nc->shape_editor->scale_nodes (offset, -1);
 628                         if (nc->rightctrl)
 629                             nc->shape_editor->scale_nodes (offset, 1);
 630                     } else if (MOD__ALT) {
 631                         if (nc->leftalt && nc->rightalt)
 632                             nc->shape_editor->scale_nodes_screen (1, 0);
 633                         else {
 634                             if (nc->leftalt)
 635                                 nc->shape_editor->scale_nodes_screen (1, -1);
 636                             if (nc->rightalt)
 637                                 nc->shape_editor->scale_nodes_screen (1, 1);
 638                         }
 639                     } else {
 640                         nc->shape_editor->scale_nodes (offset, 0);
 641                     }
 642                     ret = TRUE;
 643                     break;
 644
 645                 case GDK_Alt_L:
 646                     nc->leftalt = TRUE;
 647                     sp_node_context_show_modifier_tip(event_context, event);
 648                     break;
 649                 case GDK_Alt_R:
 650                     nc->rightalt = TRUE;
 651                     sp_node_context_show_modifier_tip(event_context, event);
 652                     break;
 653                 case GDK_Control_L:
 654                     nc->leftctrl = TRUE;
 655                     sp_node_context_show_modifier_tip(event_context, event);
 656                     break;
 657                 case GDK_Control_R:
 658                     nc->rightctrl = TRUE;
 659                     sp_node_context_show_modifier_tip(event_context, event);
 660                     break;
 661                 case GDK_Shift_L:
 662                 case GDK_Shift_R:
 663                 case GDK_Meta_L:
 664                 case GDK_Meta_R:
 665                     sp_node_context_show_modifier_tip(event_context, event);
 666                     break;
 667                 default:
 668                     ret = node_key(event);
 669                     break;
 670             }
 671             break;
 672         case GDK_KEY_RELEASE:
 673             switch (get_group0_keyval(&event->key)) {
 674                 case GDK_Alt_L:
 675                     nc->leftalt = FALSE;
 676                     event_context->defaultMessageContext()->clear();
 677                     break;
 678                 case GDK_Alt_R:
 679                     nc->rightalt = FALSE;
 680                     event_context->defaultMessageContext()->clear();
 681                     break;
 682                 case GDK_Control_L:
 683                     nc->leftctrl = FALSE;
 684                     event_context->defaultMessageContext()->clear();
 685                     break;
 686                 case GDK_Control_R:
 687                     nc->rightctrl = FALSE;
 688                     event_context->defaultMessageContext()->clear();
 689                     break;
 690                 case GDK_Shift_L:
 691                 case GDK_Shift_R:
 692                 case GDK_Meta_L:
 693                 case GDK_Meta_R:
 694                     event_context->defaultMessageContext()->clear();
 695                     break;
 696             }
 697             break;
 698         default:
 699             break;
 700     }
 701
 702     if (!ret) {
 703         if (((SPEventContextClass *) parent_class)->root_handler)
 704             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 705     }
 706
 707     return ret;
 708 }
 709
 710
 711 /*
 712   Local Variables:
 713   mode:c++
 714   c-file-style:"stroustrup"
 715   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 716   indent-tabs-mode:nil
 717   fill-column:99
 718   End:
 719 */
 720 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :