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     SPDesktop *desktop = event_context->desktop;
 195     Inkscape::Selection *selection = sp_desktop_selection (desktop);
 196
 197     SPNodeContext *nc = SP_NODE_CONTEXT(event_context);
 198
 199     switch (event->type) {
 200         case GDK_2BUTTON_PRESS:
 201         case GDK_BUTTON_RELEASE:
 202             if (event->button.button == 1) {
 203                 if (!nc->drag) {
 204
 205                     // find out clicked item, disregarding groups, honoring Alt
 206                     SPItem *item_clicked = sp_event_context_find_item (desktop,
 207                             NR::Point(event->button.x, event->button.y),
 208                             (event->button.state & GDK_MOD1_MASK) && !(event->button.state & GDK_CONTROL_MASK), TRUE);
 209                     // find out if we're over the selected item, disregarding groups
 210                     SPItem *item_over = sp_event_context_over_item (desktop, selection->singleItem(),
 211                                                                     NR::Point(event->button.x, event->button.y));
 212
 213                     bool over_stroke = false;
 214                     if (item_over && nc->shape_editor->has_nodepath()) {
 215                         over_stroke = nc->shape_editor->is_over_stroke(NR::Point(event->button.x, event->button.y), false);
 216                     }
 217
 218                     if (over_stroke || nc->added_node) {
 219                         switch (event->type) {
 220                             case GDK_BUTTON_RELEASE:
 221                                 if (event->button.state & GDK_CONTROL_MASK && event->button.state & GDK_MOD1_MASK) {
 222                                     //add a node
 223                                     nc->shape_editor->add_node_near_point();
 224                                 } else {
 225                                     if (nc->added_node) { // we just received double click, ignore release
 226                                         nc->added_node = false;
 227                                         break;
 228                                     }
 229                                     //select the segment
 230                                     if (event->button.state & GDK_SHIFT_MASK) {
 231                                         nc->shape_editor->select_segment_near_point(true);
 232                                     } else {
 233                                         nc->shape_editor->select_segment_near_point(false);
 234                                     }
 235                                     desktop->updateNow();
 236                                 }
 237                                 break;
 238                             case GDK_2BUTTON_PRESS:
 239                                 //add a node
 240                                 nc->shape_editor->add_node_near_point();
 241                                 nc->added_node = true;
 242                                 break;
 243                             default:
 244                                 break;
 245                         }
 246                     } else if (event->button.state & GDK_SHIFT_MASK) {
 247                         selection->toggle(item_clicked);
 248                         desktop->updateNow();
 249                     } else {
 250                         selection->set(item_clicked);
 251                         desktop->updateNow();
 252                     }
 253
 254                     ret = TRUE;
 255                 }
 256                 break;
 257             }
 258             break;
 259         case GDK_BUTTON_PRESS:
 260             if (event->button.button == 1 && !(event->button.state & GDK_SHIFT_MASK)) {
 261                 // save drag origin
 262                 event_context->xp = (gint) event->button.x;
 263                 event_context->yp = (gint) event->button.y;
 264                 event_context->within_tolerance = true;
 265                 nc->shape_editor->cancel_hit();
 266
 267                 if (!nc->drag) {
 268                     // find out if we're over the selected item, disregarding groups
 269                     SPItem *item_over = sp_event_context_over_item (desktop, selection->singleItem(),
 270                                                                     NR::Point(event->button.x, event->button.y));
 271
 272                     if (nc->shape_editor->has_nodepath() && selection->single() && item_over) {
 273
 274                             // save drag origin
 275                             bool over_stroke = nc->shape_editor->is_over_stroke(NR::Point(event->button.x, event->button.y), true);
 276                             //only dragging curves
 277                             if (over_stroke) {
 278                                 ret = TRUE;
 279                             } else {
 280                                 break;
 281                             }
 282                         } else {
 283                             break;
 284                         }
 285
 286                     ret = TRUE;
 287                 }
 288                 break;
 289             }
 290             break;
 291         default:
 292             break;
 293     }
 294
 295     if (!ret) {
 296         if (((SPEventContextClass *) parent_class)->item_handler)
 297             ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 298     }
 299
 300     return ret;
 301 }
 302
 303 static gint
 304 sp_node_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 305 {
 306     SPDesktop *desktop = event_context->desktop;
 307     Inkscape::Selection *selection = sp_desktop_selection (desktop);
 308
 309     SPNodeContext *nc = SP_NODE_CONTEXT(event_context);
 310     double const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 311     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100); // read every time, to make prefs changes really live
 312     int const snaps = prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12);
 313     double const offset = prefs_get_double_attribute_limited("options.defaultscale", "value", 2, 0, 1000);
 314
 315     gint ret = FALSE;
 316
 317     switch (event->type) {
 318         case GDK_BUTTON_PRESS:
 319             if (event->button.button == 1) {
 320                 // save drag origin
 321                 event_context->xp = (gint) event->button.x;
 322                 event_context->yp = (gint) event->button.y;
 323                 event_context->within_tolerance = true;
 324                 nc->shape_editor->cancel_hit();
 325
 326                 NR::Point const button_w(event->button.x,
 327                                          event->button.y);
 328                 NR::Point const button_dt(desktop->w2d(button_w));
 329                 Inkscape::Rubberband::get()->start(desktop, button_dt);
 330                 nc->current_state = SP_NODE_CONTEXT_INACTIVE;
 331                 desktop->updateNow();
 332                 ret = TRUE;
 333             }
 334             break;
 335         case GDK_MOTION_NOTIFY:
 336             if (event->motion.state & GDK_BUTTON1_MASK) {
 337
 338                 if ( event_context->within_tolerance
 339                      && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 340                      && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 341                     break; // do not drag if we're within tolerance from origin
 342                 }
 343
 344                 // The path went away while dragging; throw away any further motion
 345                 // events until the mouse pointer is released.
 346
 347                 if (nc->shape_editor->hits_curve() && !nc->shape_editor->has_nodepath()) {
 348                   break;
 349                 }
 350
 351                 // Once the user has moved farther than tolerance from the original location
 352                 // (indicating they intend to move the object, not click), then always process the
 353                 // motion notify coordinates as given (no snapping back to origin)
 354                 event_context->within_tolerance = false;
 355
 356                 // Once we determine what the user is doing (dragging either a node or the
 357                 // selection rubberband), make sure we continue to perform that operation
 358                 // until the mouse pointer is lifted.
 359                 if (nc->current_state == SP_NODE_CONTEXT_INACTIVE) {
 360                     if (nc->shape_editor->hits_curve() && nc->shape_editor->has_nodepath()) {
 361                         nc->current_state = SP_NODE_CONTEXT_NODE_DRAGGING;
 362                     } else {
 363                         nc->current_state = SP_NODE_CONTEXT_RUBBERBAND_DRAGGING;
 364                     }
 365                 }
 366
 367                 switch (nc->current_state) {
 368                     case SP_NODE_CONTEXT_NODE_DRAGGING:
 369                         {
 370                             nc->shape_editor->curve_drag (event->motion.x, event->motion.y);
 371
 372                             gobble_motion_events(GDK_BUTTON1_MASK);
 373                             break;
 374                         }
 375                     case SP_NODE_CONTEXT_RUBBERBAND_DRAGGING:
 376                         if (Inkscape::Rubberband::get()->is_started()) {
 377                             NR::Point const motion_w(event->motion.x,
 378                                                 event->motion.y);
 379                             NR::Point const motion_dt(desktop->w2d(motion_w));
 380                             Inkscape::Rubberband::get()->move(motion_dt);
 381                         }
 382                         break;
 383                 }
 384
 385                 nc->drag = TRUE;
 386                 ret = TRUE;
 387             } else {
 388                 if (!nc->shape_editor->has_nodepath() || selection->singleItem() == NULL) {
 389                     break;
 390                 }
 391
 392                 SPItem *item_over = sp_event_context_over_item (desktop, selection->singleItem(),
 393                                                                 NR::Point(event->motion.x, event->motion.y));
 394                 bool over_stroke = false;
 395                 if (item_over && nc->shape_editor->has_nodepath()) {
 396                     over_stroke = nc->shape_editor->is_over_stroke(NR::Point(event->motion.x, event->motion.y), false);
 397                 }
 398
 399                 if (nc->cursor_drag && !over_stroke) {
 400                     event_context->cursor_shape = cursor_node_xpm;
 401                     event_context->hot_x = 1;
 402                     event_context->hot_y = 1;
 403                     sp_event_context_update_cursor(event_context);
 404                     nc->cursor_drag = false;
 405                 } else if (!nc->cursor_drag && over_stroke) {
 406                     event_context->cursor_shape = cursor_node_d_xpm;
 407                     event_context->hot_x = 1;
 408                     event_context->hot_y = 1;
 409                     sp_event_context_update_cursor(event_context);
 410                     nc->cursor_drag = true;
 411                 }
 412             }
 413             break;
 414         case GDK_BUTTON_RELEASE:
 415             event_context->xp = event_context->yp = 0;
 416             if (event->button.button == 1) {
 417
 418                 NR::Maybe<NR::Rect> b = Inkscape::Rubberband::get()->getRectangle();
 419
 420                 if (nc->shape_editor->hits_curve() && !event_context->within_tolerance) { //drag curve
 421                     nc->shape_editor->finish_drag();
 422                 } else if (b && !event_context->within_tolerance) { // drag to select
 423                     nc->shape_editor->select_rect(*b, event->button.state & GDK_SHIFT_MASK);
 424                 } else {
 425                     if (!(nc->rb_escaped)) { // unless something was cancelled
 426                         if (nc->shape_editor->has_selection())
 427                             nc->shape_editor->deselect();
 428                         else
 429                             sp_desktop_selection(desktop)->clear();
 430                     }
 431                 }
 432                 ret = TRUE;
 433                 Inkscape::Rubberband::get()->stop();
 434                 desktop->updateNow();
 435                 nc->rb_escaped = false;
 436                 nc->drag = FALSE;
 437                 nc->shape_editor->cancel_hit();
 438                 nc->current_state = SP_NODE_CONTEXT_INACTIVE;
 439                 break;
 440             }
 441             break;
 442         case GDK_KEY_PRESS:
 443             switch (get_group0_keyval(&event->key)) {
 444                 case GDK_Insert:
 445                 case GDK_KP_Insert:
 446                     // with any modifiers
 447                     nc->shape_editor->add_node();
 448                     ret = TRUE;
 449                     break;
 450                 case GDK_Delete:
 451                 case GDK_KP_Delete:
 452                 case GDK_BackSpace:
 453                     if (MOD__CTRL_ONLY) {
 454                         nc->shape_editor->delete_nodes();
 455                     } else {
 456                         nc->shape_editor->delete_nodes_preserving_shape();
 457                     }
 458                     ret = TRUE;
 459                     break;
 460                 case GDK_C:
 461                 case GDK_c:
 462                     if (MOD__SHIFT_ONLY) {
 463                         nc->shape_editor->set_node_type(Inkscape::NodePath::NODE_CUSP);
 464                         ret = TRUE;
 465                     }
 466                     break;
 467                 case GDK_S:
 468                 case GDK_s:
 469                     if (MOD__SHIFT_ONLY) {
 470                         nc->shape_editor->set_node_type(Inkscape::NodePath::NODE_SMOOTH);
 471                         ret = TRUE;
 472                     }
 473                     break;
 474                 case GDK_Y:
 475                 case GDK_y:
 476                     if (MOD__SHIFT_ONLY) {
 477                         nc->shape_editor->set_node_type(Inkscape::NodePath::NODE_SYMM);
 478                         ret = TRUE;
 479                     }
 480                     break;
 481                 case GDK_B:
 482                 case GDK_b:
 483                     if (MOD__SHIFT_ONLY) {
 484                         nc->shape_editor->break_at_nodes();
 485                         ret = TRUE;
 486                     }
 487                     break;
 488                 case GDK_J:
 489                 case GDK_j:
 490                     if (MOD__SHIFT_ONLY) {
 491                         nc->shape_editor->join_nodes();
 492                         ret = TRUE;
 493                     }
 494                     break;
 495                 case GDK_D:
 496                 case GDK_d:
 497                     if (MOD__SHIFT_ONLY) {
 498                         nc->shape_editor->duplicate_nodes();
 499                         ret = TRUE;
 500                     }
 501                     break;
 502                 case GDK_L:
 503                 case GDK_l:
 504                     if (MOD__SHIFT_ONLY) {
 505                         nc->shape_editor->set_type_of_segments(NR_LINETO);
 506                         ret = TRUE;
 507                     }
 508                     break;
 509                 case GDK_U:
 510                 case GDK_u:
 511                     if (MOD__SHIFT_ONLY) {
 512                         nc->shape_editor->set_type_of_segments(NR_CURVETO);
 513                         ret = TRUE;
 514                     }
 515                     break;
 516                 case GDK_R:
 517                 case GDK_r:
 518                     if (MOD__SHIFT_ONLY) {
 519                         // FIXME: add top panel button
 520                         sp_selected_path_reverse();
 521                         ret = TRUE;
 522                     }
 523                     break;
 524                 case GDK_Left: // move selection left
 525                 case GDK_KP_Left:
 526                 case GDK_KP_4:
 527                     if (!MOD__CTRL) { // not ctrl
 528                         if (MOD__ALT) { // alt
 529                             if (MOD__SHIFT) nc->shape_editor->move_nodes_screen(-10, 0); // shift
 530                             else nc->shape_editor->move_nodes_screen(-1, 0); // no shift
 531                         }
 532                         else { // no alt
 533                             if (MOD__SHIFT) nc->shape_editor->move_nodes(-10*nudge, 0); // shift
 534                             else nc->shape_editor->move_nodes(-nudge, 0); // no shift
 535                         }
 536                         ret = TRUE;
 537                     }
 538                     break;
 539                 case GDK_Up: // move selection up
 540                 case GDK_KP_Up:
 541                 case GDK_KP_8:
 542                     if (!MOD__CTRL) { // not ctrl
 543                         if (MOD__ALT) { // alt
 544                             if (MOD__SHIFT) nc->shape_editor->move_nodes_screen(0, 10); // shift
 545                             else nc->shape_editor->move_nodes_screen(0, 1); // no shift
 546                         }
 547                         else { // no alt
 548                             if (MOD__SHIFT) nc->shape_editor->move_nodes(0, 10*nudge); // shift
 549                             else nc->shape_editor->move_nodes(0, nudge); // no shift
 550                         }
 551                         ret = TRUE;
 552                     }
 553                     break;
 554                 case GDK_Right: // move selection right
 555                 case GDK_KP_Right:
 556                 case GDK_KP_6:
 557                     if (!MOD__CTRL) { // not ctrl
 558                         if (MOD__ALT) { // alt
 559                             if (MOD__SHIFT) nc->shape_editor->move_nodes_screen(10, 0); // shift
 560                             else nc->shape_editor->move_nodes_screen(1, 0); // no shift
 561                         }
 562                         else { // no alt
 563                             if (MOD__SHIFT) nc->shape_editor->move_nodes(10*nudge, 0); // shift
 564                             else nc->shape_editor->move_nodes(nudge, 0); // no shift
 565                         }
 566                         ret = TRUE;
 567                     }
 568                     break;
 569                 case GDK_Down: // move selection down
 570                 case GDK_KP_Down:
 571                 case GDK_KP_2:
 572                     if (!MOD__CTRL) { // not ctrl
 573                         if (MOD__ALT) { // alt
 574                             if (MOD__SHIFT) nc->shape_editor->move_nodes_screen(0, -10); // shift
 575                             else nc->shape_editor->move_nodes_screen(0, -1); // no shift
 576                         }
 577                         else { // no alt
 578                             if (MOD__SHIFT) nc->shape_editor->move_nodes(0, -10*nudge); // shift
 579                             else nc->shape_editor->move_nodes(0, -nudge); // no shift
 580                         }
 581                         ret = TRUE;
 582                     }
 583                     break;
 584                 case GDK_Escape:
 585                 {
 586                     NR::Maybe<NR::Rect> const b = Inkscape::Rubberband::get()->getRectangle();
 587                     if (b) {
 588                         Inkscape::Rubberband::get()->stop();
 589                         nc->current_state = SP_NODE_CONTEXT_INACTIVE;
 590                         nc->rb_escaped = true;
 591                     } else {
 592                         if (nc->shape_editor->has_selection()) {
 593                             nc->shape_editor->deselect();
 594                         } else {
 595                             sp_desktop_selection(desktop)->clear();
 596                         }
 597                     }
 598                     ret = TRUE;
 599                     break;
 600                 }
 601
 602                 case GDK_bracketleft:
 603                     if ( MOD__CTRL && !MOD__ALT && ( snaps != 0 ) ) {
 604                         if (nc->leftctrl)
 605                             nc->shape_editor->rotate_nodes (M_PI/snaps, -1, false);
 606                         if (nc->rightctrl)
 607                             nc->shape_editor->rotate_nodes (M_PI/snaps, 1, false);
 608                     } else if ( MOD__ALT && !MOD__CTRL ) {
 609                         if (nc->leftalt && nc->rightalt)
 610                             nc->shape_editor->rotate_nodes (1, 0, true);
 611                         else {
 612                             if (nc->leftalt)
 613                                 nc->shape_editor->rotate_nodes (1, -1, true);
 614                             if (nc->rightalt)
 615                                 nc->shape_editor->rotate_nodes (1, 1, true);
 616                         }
 617                     } else if ( snaps != 0 ) {
 618                         nc->shape_editor->rotate_nodes (M_PI/snaps, 0, false);
 619                     }
 620                     ret = TRUE;
 621                     break;
 622                 case GDK_bracketright:
 623                     if ( MOD__CTRL && !MOD__ALT && ( snaps != 0 ) ) {
 624                         if (nc->leftctrl)
 625                             nc->shape_editor->rotate_nodes (-M_PI/snaps, -1, false);
 626                         if (nc->rightctrl)
 627                             nc->shape_editor->rotate_nodes (-M_PI/snaps, 1, false);
 628                     } else if ( MOD__ALT && !MOD__CTRL ) {
 629                         if (nc->leftalt && nc->rightalt)
 630                             nc->shape_editor->rotate_nodes (-1, 0, true);
 631                         else {
 632                             if (nc->leftalt)
 633                                 nc->shape_editor->rotate_nodes (-1, -1, true);
 634                             if (nc->rightalt)
 635                                 nc->shape_editor->rotate_nodes (-1, 1, true);
 636                         }
 637                     } else if ( snaps != 0 ) {
 638                         nc->shape_editor->rotate_nodes (-M_PI/snaps, 0, false);
 639                     }
 640                     ret = TRUE;
 641                     break;
 642                 case GDK_less:
 643                 case GDK_comma:
 644                     if (MOD__CTRL) {
 645                         if (nc->leftctrl)
 646                             nc->shape_editor->scale_nodes(-offset, -1);
 647                         if (nc->rightctrl)
 648                             nc->shape_editor->scale_nodes(-offset, 1);
 649                     } else if (MOD__ALT) {
 650                         if (nc->leftalt && nc->rightalt)
 651                             nc->shape_editor->scale_nodes_screen (-1, 0);
 652                         else {
 653                             if (nc->leftalt)
 654                                 nc->shape_editor->scale_nodes_screen (-1, -1);
 655                             if (nc->rightalt)
 656                                 nc->shape_editor->scale_nodes_screen (-1, 1);
 657                         }
 658                     } else {
 659                         nc->shape_editor->scale_nodes (-offset, 0);
 660                     }
 661                     ret = TRUE;
 662                     break;
 663                 case GDK_greater:
 664                 case GDK_period:
 665                     if (MOD__CTRL) {
 666                         if (nc->leftctrl)
 667                             nc->shape_editor->scale_nodes (offset, -1);
 668                         if (nc->rightctrl)
 669                             nc->shape_editor->scale_nodes (offset, 1);
 670                     } else if (MOD__ALT) {
 671                         if (nc->leftalt && nc->rightalt)
 672                             nc->shape_editor->scale_nodes_screen (1, 0);
 673                         else {
 674                             if (nc->leftalt)
 675                                 nc->shape_editor->scale_nodes_screen (1, -1);
 676                             if (nc->rightalt)
 677                                 nc->shape_editor->scale_nodes_screen (1, 1);
 678                         }
 679                     } else {
 680                         nc->shape_editor->scale_nodes (offset, 0);
 681                     }
 682                     ret = TRUE;
 683                     break;
 684
 685                 case GDK_Alt_L:
 686                     nc->leftalt = TRUE;
 687                     sp_node_context_show_modifier_tip(event_context, event);
 688                     break;
 689                 case GDK_Alt_R:
 690                     nc->rightalt = TRUE;
 691                     sp_node_context_show_modifier_tip(event_context, event);
 692                     break;
 693                 case GDK_Control_L:
 694                     nc->leftctrl = TRUE;
 695                     sp_node_context_show_modifier_tip(event_context, event);
 696                     break;
 697                 case GDK_Control_R:
 698                     nc->rightctrl = TRUE;
 699                     sp_node_context_show_modifier_tip(event_context, event);
 700                     break;
 701                 case GDK_Shift_L:
 702                 case GDK_Shift_R:
 703                 case GDK_Meta_L:
 704                 case GDK_Meta_R:
 705                     sp_node_context_show_modifier_tip(event_context, event);
 706                     break;
 707                 default:
 708                     ret = node_key(event);
 709                     break;
 710             }
 711             break;
 712         case GDK_KEY_RELEASE:
 713             switch (get_group0_keyval(&event->key)) {
 714                 case GDK_Alt_L:
 715                     nc->leftalt = FALSE;
 716                     event_context->defaultMessageContext()->clear();
 717                     break;
 718                 case GDK_Alt_R:
 719                     nc->rightalt = FALSE;
 720                     event_context->defaultMessageContext()->clear();
 721                     break;
 722                 case GDK_Control_L:
 723                     nc->leftctrl = FALSE;
 724                     event_context->defaultMessageContext()->clear();
 725                     break;
 726                 case GDK_Control_R:
 727                     nc->rightctrl = FALSE;
 728                     event_context->defaultMessageContext()->clear();
 729                     break;
 730                 case GDK_Shift_L:
 731                 case GDK_Shift_R:
 732                 case GDK_Meta_L:
 733                 case GDK_Meta_R:
 734                     event_context->defaultMessageContext()->clear();
 735                     break;
 736             }
 737             break;
 738         default:
 739             break;
 740     }
 741
 742     if (!ret) {
 743         if (((SPEventContextClass *) parent_class)->root_handler)
 744             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 745     }
 746
 747     return ret;
 748 }
 749
 750
 751 /*
 752   Local Variables:
 753   mode:c++
 754   c-file-style:"stroustrup"
 755   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 756   indent-tabs-mode:nil
 757   fill-column:99
 758   End:
 759 */
 760 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :