src/select-context.cpp

   1 #define __SP_SELECT_CONTEXT_C__
   2
   3 /*
   4  * Selection and transformation context
   5  *
   6  * Author:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   bulia byak <buliabyak@users.sf.net>
   9   *
  10  * Copyright (C) 1999-2005 authors
  11  *
  12  * Released under GNU GPL, read the file 'COPYING' for more information
  13  */
  14
  15 #ifdef HAVE_CONFIG_H
  16 # include "config.h"
  17 #endif
  18 #include <gdk/gdkkeysyms.h>
  19 #include "macros.h"
  20 #include "rubberband.h"
  21 #include "document.h"
  22 #include "selection.h"
  23 #include "seltrans-handles.h"
  24 #include "sp-cursor.h"
  25 #include "pixmaps/cursor-select-m.xpm"
  26 #include "pixmaps/cursor-select-d.xpm"
  27 #include "pixmaps/handles.xpm"
  28 #include <glibmm/i18n.h>
  29
  30 #include "select-context.h"
  31 #include "selection-chemistry.h"
  32 #include "desktop.h"
  33 #include "desktop-handles.h"
  34 #include "sp-root.h"
  35 #include "prefs-utils.h"
  36 #include "tools-switch.h"
  37 #include "message-stack.h"
  38 #include "selection-describer.h"
  39 #include "seltrans.h"
  40
  41 static void sp_select_context_class_init(SPSelectContextClass *klass);
  42 static void sp_select_context_init(SPSelectContext *select_context);
  43 static void sp_select_context_dispose(GObject *object);
  44
  45 static void sp_select_context_setup(SPEventContext *ec);
  46 static void sp_select_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  47 static gint sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  48 static gint sp_select_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  49
  50 static SPEventContextClass *parent_class;
  51
  52 static GdkCursor *CursorSelectMouseover = NULL;
  53 static GdkCursor *CursorSelectDragging = NULL;
  54 GdkPixbuf *handles[13];
  55
  56 static gint rb_escaped = 0; // if non-zero, rubberband was canceled by esc, so the next button release should not deselect
  57 static gint drag_escaped = 0; // if non-zero, drag was canceled by esc
  58
  59 static gint xp = 0, yp = 0; // where drag started
  60 static gint tolerance = 0;
  61 static bool within_tolerance = false;
  62
  63 GtkType
  64 sp_select_context_get_type(void)
  65 {
  66     static GType type = 0;
  67     if (!type) {
  68         GTypeInfo info = {
  69             sizeof(SPSelectContextClass),
  70             NULL, NULL,
  71             (GClassInitFunc) sp_select_context_class_init,
  72             NULL, NULL,
  73             sizeof(SPSelectContext),
  74             4,
  75             (GInstanceInitFunc) sp_select_context_init,
  76             NULL,   /* value_table */
  77         };
  78         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPSelectContext", &info, (GTypeFlags)0);
  79     }
  80     return type;
  81 }
  82
  83 static void
  84 sp_select_context_class_init(SPSelectContextClass *klass)
  85 {
  86     GObjectClass *object_class = (GObjectClass *) klass;
  87     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  88
  89     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
  90
  91     object_class->dispose = sp_select_context_dispose;
  92
  93     event_context_class->setup = sp_select_context_setup;
  94     event_context_class->set = sp_select_context_set;
  95     event_context_class->root_handler = sp_select_context_root_handler;
  96     event_context_class->item_handler = sp_select_context_item_handler;
  97
  98     // cursors in select context
  99     CursorSelectMouseover = sp_cursor_new_from_xpm(cursor_select_m_xpm , 1, 1);
 100     CursorSelectDragging = sp_cursor_new_from_xpm(cursor_select_d_xpm , 1, 1);
 101     // selection handles
 102     handles[0]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_nw_xpm);
 103     handles[1]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_ne_xpm);
 104     handles[2]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_h_xpm);
 105     handles[3]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_v_xpm);
 106     handles[4]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_nw_xpm);
 107     handles[5]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_n_xpm);
 108     handles[6]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_ne_xpm);
 109     handles[7]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_e_xpm);
 110     handles[8]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_se_xpm);
 111     handles[9]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_s_xpm);
 112     handles[10] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_sw_xpm);
 113     handles[11] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_w_xpm);
 114     handles[12] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_center_xpm);
 115
 116 }
 117
 118 static void
 119 sp_select_context_init(SPSelectContext *sc)
 120 {
 121     sc->dragging = FALSE;
 122     sc->moved = FALSE;
 123     sc->button_press_shift = false;
 124     sc->button_press_ctrl = false;
 125     sc->button_press_alt = false;
 126     sc->_seltrans = NULL;
 127     sc->_describer = NULL;
 128 }
 129
 130 static void
 131 sp_select_context_dispose(GObject *object)
 132 {
 133     SPSelectContext *sc = SP_SELECT_CONTEXT(object);
 134     SPEventContext * ec = SP_EVENT_CONTEXT (object);
 135
 136     ec->enableGrDrag(false);
 137
 138     if (sc->grabbed) {
 139         sp_canvas_item_ungrab(sc->grabbed, GDK_CURRENT_TIME);
 140         sc->grabbed = NULL;
 141     }
 142
 143     delete sc->_seltrans;
 144     sc->_seltrans = NULL;
 145     delete sc->_describer;
 146     sc->_describer = NULL;
 147
 148     if (CursorSelectDragging) {
 149         gdk_cursor_unref (CursorSelectDragging);
 150         CursorSelectDragging = NULL;
 151     }
 152     if (CursorSelectMouseover) {
 153         gdk_cursor_unref (CursorSelectMouseover);
 154         CursorSelectMouseover = NULL;
 155     }
 156
 157     G_OBJECT_CLASS(parent_class)->dispose(object);
 158 }
 159
 160 static void
 161 sp_select_context_setup(SPEventContext *ec)
 162 {
 163     SPSelectContext *select_context = SP_SELECT_CONTEXT(ec);
 164
 165     if (((SPEventContextClass *) parent_class)->setup) {
 166         ((SPEventContextClass *) parent_class)->setup(ec);
 167     }
 168
 169     SPDesktop *desktop = ec->desktop;
 170
 171     select_context->_describer = new Inkscape::SelectionDescriber(desktop->selection, desktop->messageStack());
 172
 173     select_context->_seltrans = new Inkscape::SelTrans(desktop);
 174
 175     sp_event_context_read(ec, "show");
 176     sp_event_context_read(ec, "transform");
 177
 178     if (prefs_get_int_attribute("tools.select", "gradientdrag", 0) != 0) {
 179         ec->enableGrDrag();
 180     }
 181 }
 182
 183 static void
 184 sp_select_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 185 {
 186     SPSelectContext *sc = SP_SELECT_CONTEXT(ec);
 187
 188     if (!strcmp(key, "show")) {
 189         if (val && !strcmp(val, "outline")) {
 190             sc->_seltrans->setShow(Inkscape::SelTrans::SHOW_OUTLINE);
 191         } else {
 192             sc->_seltrans->setShow(Inkscape::SelTrans::SHOW_CONTENT);
 193         }
 194     }
 195 }
 196
 197 static bool
 198 sp_select_context_abort(SPEventContext *event_context)
 199 {
 200     SPDesktop *desktop = event_context->desktop;
 201     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 202     Inkscape::SelTrans *seltrans = sc->_seltrans;
 203
 204     if (sc->dragging) {
 205         if (sc->moved) { // cancel dragging an object
 206             seltrans->ungrab();
 207             sc->moved = FALSE;
 208             sc->dragging = FALSE;
 209             drag_escaped = 1;
 210
 211             if (sc->item) {
 212                 // only undo if the item is still valid
 213                 if (SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))) {
 214                     sp_document_undo(SP_DT_DOCUMENT(desktop));
 215                 }
 216
 217                 sp_object_unref( SP_OBJECT(sc->item), NULL);
 218             } else if (sc->button_press_ctrl) {
 219                 // NOTE:  This is a workaround to a bug.
 220                 // When the ctrl key is held, sc->item is not defined
 221                 // so in this case (only), we skip the object doc check
 222                 sp_document_undo(SP_DT_DOCUMENT(desktop));
 223             }
 224             sc->item = NULL;
 225
 226             SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Move canceled."));
 227             return true;
 228         }
 229     } else {
 230         NR::Maybe<NR::Rect> const b = Inkscape::Rubberband::get()->getRectangle();
 231         if (b != NR::Nothing()) {
 232             Inkscape::Rubberband::get()->stop();
 233             rb_escaped = 1;
 234             SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Selection canceled."));
 235             return true;
 236         }
 237     }
 238     return false;
 239 }
 240
 241 bool
 242 key_is_a_modifier (guint key) {
 243     return (key == GDK_Alt_L ||
 244                 key == GDK_Alt_R ||
 245                 key == GDK_Control_L ||
 246                 key == GDK_Control_R ||
 247                 key == GDK_Shift_L ||
 248                 key == GDK_Shift_R ||
 249                 key == GDK_Meta_L ||  // Meta is when you press Shift+Alt (at least on my machine)
 250             key == GDK_Meta_R);
 251 }
 252
 253 void
 254 sp_select_context_up_one_layer(SPDesktop *desktop)
 255 {
 256     /* Click in empty place, go up one level -- but don't leave a layer to root.
 257      *
 258      * (Rationale: we don't usually allow users to go to the root, since that
 259      * detracts from the layer metaphor: objects at the root level can in front
 260      * of or behind layers.  Whereas it's fine to go to the root if editing
 261      * a document that has no layers (e.g. a non-Inkscape document).)
 262      *
 263      * Once we support editing SVG "islands" (e.g. <svg> embedded in an xhtml
 264      * document), we might consider further restricting the below to disallow
 265      * leaving a layer to go to a non-layer.
 266      */
 267     SPObject *const current_layer = desktop->currentLayer();
 268     if (current_layer) {
 269         SPObject *const parent = SP_OBJECT_PARENT(current_layer);
 270         if ( parent
 271              && ( SP_OBJECT_PARENT(parent)
 272                   || !( SP_IS_GROUP(current_layer)
 273                         && ( SPGroup::LAYER
 274                              == SP_GROUP(current_layer)->layerMode() ) ) ) )
 275         {
 276             desktop->setCurrentLayer(parent);
 277             if (SP_IS_GROUP(current_layer) && SPGroup::LAYER != SP_GROUP(current_layer)->layerMode())
 278                 SP_DT_SELECTION(desktop)->set(current_layer);
 279         }
 280     }
 281 }
 282
 283 static gint
 284 sp_select_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 285 {
 286     gint ret = FALSE;
 287
 288     SPDesktop *desktop = event_context->desktop;
 289     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 290     Inkscape::SelTrans *seltrans = sc->_seltrans;
 291
 292     tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 293
 294     // make sure we still have valid objects to move around
 295     if (sc->item && SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))==NULL) {
 296         sp_select_context_abort(event_context);
 297     }
 298
 299     switch (event->type) {
 300         case GDK_BUTTON_PRESS:
 301             if (event->button.button == 1) {
 302                 /* Left mousebutton */
 303
 304                 // save drag origin
 305                 xp = (gint) event->button.x;
 306                 yp = (gint) event->button.y;
 307                 within_tolerance = true;
 308
 309                 // remember what modifiers were on before button press
 310                 sc->button_press_shift = (event->button.state & GDK_SHIFT_MASK) ? true : false;
 311                 sc->button_press_ctrl = (event->button.state & GDK_CONTROL_MASK) ? true : false;
 312                 sc->button_press_alt = (event->button.state & GDK_MOD1_MASK) ? true : false;
 313
 314                 if (event->button.state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK)) {
 315                     // if shift or ctrl was pressed, do not move objects;
 316                     // pass the event to root handler which will perform rubberband, shift-click, ctrl-click, ctrl-drag
 317                 } else {
 318                     sc->dragging = TRUE;
 319                     sc->moved = FALSE;
 320
 321                     // remember the clicked item in sc->item:
 322                     sc->item = sp_event_context_find_item (desktop,
 323                                               NR::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 324                     sp_object_ref(sc->item, NULL);
 325
 326                     rb_escaped = drag_escaped = 0;
 327
 328                     sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->drawing),
 329                                         GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_PRESS_MASK |
 330                                         GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK,
 331                                         NULL, event->button.time);
 332                     sc->grabbed = SP_CANVAS_ITEM(desktop->drawing);
 333
 334                     ret = TRUE;
 335                 }
 336             } else if (event->button.button == 3) {
 337                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 338                 sp_select_context_abort(event_context);
 339             }
 340             break;
 341
 342         case GDK_ENTER_NOTIFY:
 343         {
 344             GdkCursor *cursor = gdk_cursor_new(GDK_FLEUR);
 345             gdk_window_set_cursor(GTK_WIDGET(SP_DT_CANVAS(desktop))->window, cursor);
 346             gdk_cursor_destroy(cursor);
 347             break;
 348         }
 349
 350         case GDK_LEAVE_NOTIFY:
 351             gdk_window_set_cursor(GTK_WIDGET(SP_DT_CANVAS(desktop))->window, event_context->cursor);
 352             break;
 353
 354         case GDK_KEY_PRESS:
 355             if (get_group0_keyval (&event->key) == GDK_space) {
 356                 if (sc->dragging && sc->grabbed) {
 357                     /* stamping mode: show content mode moving */
 358                     seltrans->stamp();
 359                     ret = TRUE;
 360                 }
 361             }
 362             break;
 363
 364         default:
 365             break;
 366     }
 367
 368     if (!ret) {
 369         if (((SPEventContextClass *) parent_class)->item_handler)
 370             ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 371     }
 372
 373     return ret;
 374 }
 375
 376 static gint
 377 sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 378 {
 379     SPItem *item = NULL;
 380     SPItem *item_at_point = NULL, *group_at_point = NULL, *item_in_group = NULL;
 381     gint ret = FALSE;
 382
 383     SPDesktop *desktop = event_context->desktop;
 384     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 385     Inkscape::SelTrans *seltrans = sc->_seltrans;
 386     Inkscape::Selection *selection = SP_DT_SELECTION(desktop);
 387     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 388     gdouble const offset = prefs_get_double_attribute_limited("options.defaultscale", "value", 2, 0, 1000);
 389     tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 390     int const snaps = prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12);
 391
 392     // make sure we still have valid objects to move around
 393     if (sc->item && SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))==NULL) {
 394         sp_select_context_abort(event_context);
 395     }
 396
 397     switch (event->type) {
 398         case GDK_2BUTTON_PRESS:
 399             if (event->button.button == 1) {
 400                 if (!selection->isEmpty()) {
 401                     SPItem *clicked_item = (SPItem *) selection->itemList()->data;
 402                     if (SP_IS_GROUP (clicked_item)) { // enter group
 403                         desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 404                         SP_DT_SELECTION(desktop)->clear();
 405                         sc->dragging = false;
 406                     } else { // switch tool
 407                         tools_switch_by_item (desktop, clicked_item);
 408                     }
 409                 } else {
 410                     sp_select_context_up_one_layer(desktop);
 411                 }
 412                 ret = TRUE;
 413             }
 414             break;
 415         case GDK_BUTTON_PRESS:
 416             if (event->button.button == 1) {
 417
 418                 // save drag origin
 419                 xp = (gint) event->button.x;
 420                 yp = (gint) event->button.y;
 421                 within_tolerance = true;
 422
 423                 NR::Point const button_pt(event->button.x, event->button.y);
 424                 NR::Point const p(desktop->w2d(button_pt));
 425                 Inkscape::Rubberband::get()->start(desktop, p);
 426                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 427                                     GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK,
 428                                     NULL, event->button.time);
 429                 sc->grabbed = SP_CANVAS_ITEM(desktop->acetate);
 430
 431                 // remember what modifiers were on before button press
 432                 sc->button_press_shift = (event->button.state & GDK_SHIFT_MASK) ? true : false;
 433                 sc->button_press_ctrl = (event->button.state & GDK_CONTROL_MASK) ? true : false;
 434                 sc->button_press_alt = (event->button.state & GDK_MOD1_MASK) ? true : false;
 435
 436                 sc->moved = FALSE;
 437
 438                 rb_escaped = drag_escaped = 0;
 439
 440                 ret = TRUE;
 441             } else if (event->button.button == 3) {
 442                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 443                 sp_select_context_abort(event_context);
 444             }
 445             break;
 446
 447         case GDK_MOTION_NOTIFY:
 448             if (event->motion.state & GDK_BUTTON1_MASK) {
 449                 NR::Point const motion_pt(event->motion.x, event->motion.y);
 450                 NR::Point const p(desktop->w2d(motion_pt));
 451
 452                 if ( within_tolerance
 453                      && ( abs( (gint) event->motion.x - xp ) < tolerance )
 454                      && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
 455                     break; // do not drag if we're within tolerance from origin
 456                 }
 457                 // Once the user has moved farther than tolerance from the original location
 458                 // (indicating they intend to move the object, not click), then always process the
 459                 // motion notify coordinates as given (no snapping back to origin)
 460                 within_tolerance = false;
 461
 462                 if (sc->button_press_ctrl || sc->button_press_alt) // if ctrl or alt was pressed and it's not click, we want to drag rather than rubberband
 463                     sc->dragging = TRUE;
 464
 465                 if (sc->dragging) {
 466                     /* User has dragged fast, so we get events on root (lauris)*/
 467                     // not only that; we will end up here when ctrl-dragging as well
 468                     // and also when we started within tolerance, but trespassed tolerance outside of item
 469                     Inkscape::Rubberband::get()->stop();
 470                     item_at_point = desktop->item_at_point(NR::Point(event->button.x, event->button.y), FALSE);
 471                     if (!item_at_point) // if no item at this point, try at the click point (bug 1012200)
 472                         item_at_point = desktop->item_at_point(NR::Point(xp, yp), FALSE);
 473                     if (item_at_point || sc->moved || sc->button_press_alt) {
 474                         // drag only if starting from an item, or if something is already grabbed, or if alt-dragging
 475                         if (!sc->moved) {
 476                             item_in_group = desktop->item_at_point(NR::Point(event->button.x, event->button.y), TRUE);
 477                             group_at_point = desktop->group_at_point(NR::Point(event->button.x, event->button.y));
 478                             // if neither a group nor an item (possibly in a group) at point are selected, set selection to the item at point
 479                             if ((!item_in_group || !selection->includes(item_in_group)) &&
 480                                 (!group_at_point || !selection->includes(group_at_point))
 481                                 && !sc->button_press_alt) {
 482                                 // select what is under cursor
 483                                 if (!seltrans->isEmpty()) {
 484                                     seltrans->resetState();
 485                                 }
 486                                 // when simply ctrl-dragging, we don't want to go into groups
 487                                 if (item_at_point && !selection->includes(item_at_point))
 488                                     selection->set(item_at_point);
 489                             } // otherwise, do not change selection so that dragging selected-within-group items, as well as alt-dragging, is possible
 490                             seltrans->grab(p, -1, -1, FALSE);
 491                             sc->moved = TRUE;
 492                         }
 493                         if (!seltrans->isEmpty())
 494                             seltrans->moveTo(p, event->button.state);
 495                         if (desktop->scroll_to_point(&p))
 496                             // unfortunately in complex drawings, gobbling results in losing grab of the object, for some mysterious reason
 497                             ; //gobble_motion_events(GDK_BUTTON1_MASK);
 498                         ret = TRUE;
 499                     } else {
 500                         sc->dragging = FALSE;
 501                     }
 502                 } else {
 503                     Inkscape::Rubberband::get()->move(p);
 504                     gobble_motion_events(GDK_BUTTON1_MASK);
 505                 }
 506             }
 507             break;
 508         case GDK_BUTTON_RELEASE:
 509             xp = yp = 0;
 510             if ((event->button.button == 1) && (sc->grabbed)) {
 511                 if (sc->dragging) {
 512                     if (sc->moved) {
 513                         // item has been moved
 514                         seltrans->ungrab();
 515                         sc->moved = FALSE;
 516                     } else if (sc->item && !drag_escaped) {
 517                         // item has not been moved -> simply a click, do selecting
 518                         if (!selection->isEmpty()) {
 519                             if (event->button.state & GDK_SHIFT_MASK) {
 520                                 // with shift, toggle selection
 521                                 seltrans->resetState();
 522                                 selection->toggle(sc->item);
 523                             } else {
 524                                 // without shift, increase state (i.e. toggle scale/rotation handles)
 525                                 if (selection->includes(sc->item)) {
 526                                     seltrans->increaseState();
 527                                 } else {
 528                                     seltrans->resetState();
 529                                     selection->set(sc->item);
 530                                 }
 531                             }
 532                         } else { // simple or shift click, no previous selection
 533                             seltrans->resetState();
 534                             selection->set(sc->item);
 535                         }
 536                     }
 537                     sc->dragging = FALSE;
 538                     if (sc->item) {
 539                         sp_object_unref( SP_OBJECT(sc->item), NULL);
 540                     }
 541                     sc->item = NULL;
 542                 } else {
 543                     NR::Maybe<NR::Rect> const b = Inkscape::Rubberband::get()->getRectangle();
 544                     if (b != NR::Nothing() && !within_tolerance) {
 545                         // this was a rubberband drag
 546                         Inkscape::Rubberband::get()->stop();
 547                         seltrans->resetState();
 548                         // find out affected items:
 549                         GSList *items = sp_document_items_in_box(SP_DT_DOCUMENT(desktop), desktop->dkey, b.assume());
 550                         if (event->button.state & GDK_SHIFT_MASK) {
 551                             // with shift, add to selection
 552                             selection->addList (items);
 553                         } else {
 554                             // without shift, simply select anew
 555                             selection->setList (items);
 556                         }
 557                         g_slist_free (items);
 558                     } else { // it was just a click, or a too small rubberband
 559                         Inkscape::Rubberband::get()->stop();
 560                         if (sc->button_press_shift && !rb_escaped && !drag_escaped) {
 561                             // this was a shift-click, select what was clicked upon
 562
 563                             sc->button_press_shift = false;
 564
 565                             if (sc->button_press_ctrl) {
 566                                 // go into groups, honoring Alt
 567                                 item = sp_event_context_find_item (desktop,
 568                                                    NR::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, TRUE);
 569                                 sc->button_press_ctrl = FALSE;
 570                             } else {
 571                                 // don't go into groups, honoring Alt
 572                                 item = sp_event_context_find_item (desktop,
 573                                                    NR::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 574                             }
 575
 576                             if (item) {
 577                                 selection->toggle(item);
 578                                 item = NULL;
 579                             }
 580
 581                         } else if (sc->button_press_ctrl && !rb_escaped && !drag_escaped) { // ctrl-click
 582
 583                             sc->button_press_ctrl = FALSE;
 584
 585                             item = sp_event_context_find_item (desktop,
 586                                          NR::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, TRUE);
 587
 588                             if (item) {
 589                                 if (selection->includes(item)) {
 590                                     seltrans->increaseState();
 591                                 } else {
 592                                     seltrans->resetState();
 593                                     selection->set(item);
 594                                 }
 595                                 item = NULL;
 596                             }
 597
 598                         } else { // click without shift, simply deselect, unless with Alt or something was cancelled
 599                             if (!selection->isEmpty()) {
 600                                 if (!(rb_escaped) && !(drag_escaped) && !(event->button.state & GDK_MOD1_MASK))
 601                                     selection->clear();
 602                                 rb_escaped = 0;
 603                                 ret = TRUE;
 604                             }
 605                         }
 606                     }
 607                     ret = TRUE;
 608                 }
 609                 if (sc->grabbed) {
 610                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 611                     sc->grabbed = NULL;
 612                 }
 613             }
 614             sc->button_press_shift = false;
 615             sc->button_press_ctrl = false;
 616             sc->button_press_alt = false;
 617             break;
 618
 619         case GDK_KEY_PRESS: // keybindings for select context
 620
 621             if (!key_is_a_modifier (get_group0_keyval (&event->key))) {
 622                     event_context->defaultMessageContext()->clear();
 623             } else {
 624                     sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
 625                                                 _("<b>Ctrl</b>: select in groups, move hor/vert"),
 626                                                 _("<b>Shift</b>: toggle select, force rubberband, disable snapping"),
 627                                                 _("<b>Alt</b>: select under, move selected"));
 628                     break;
 629             }
 630
 631             switch (get_group0_keyval (&event->key)) {
 632                 case GDK_Left: // move selection left
 633                 case GDK_KP_Left:
 634                 case GDK_KP_4:
 635                     if (!MOD__CTRL) { // not ctrl
 636                         if (MOD__ALT) { // alt
 637                             if (MOD__SHIFT) sp_selection_move_screen(-10, 0); // shift
 638                             else sp_selection_move_screen(-1, 0); // no shift
 639                         }
 640                         else { // no alt
 641                             if (MOD__SHIFT) sp_selection_move(-10*nudge, 0); // shift
 642                             else sp_selection_move(-nudge, 0); // no shift
 643                         }
 644                         ret = TRUE;
 645                     }
 646                     break;
 647                 case GDK_Up: // move selection up
 648                 case GDK_KP_Up:
 649                 case GDK_KP_8:
 650                     if (!MOD__CTRL) { // not ctrl
 651                         if (MOD__ALT) { // alt
 652                             if (MOD__SHIFT) sp_selection_move_screen(0, 10); // shift
 653                             else sp_selection_move_screen(0, 1); // no shift
 654                         }
 655                         else { // no alt
 656                             if (MOD__SHIFT) sp_selection_move(0, 10*nudge); // shift
 657                             else sp_selection_move(0, nudge); // no shift
 658                         }
 659                         ret = TRUE;
 660                     }
 661                     break;
 662                 case GDK_Right: // move selection right
 663                 case GDK_KP_Right:
 664                 case GDK_KP_6:
 665                     if (!MOD__CTRL) { // not ctrl
 666                         if (MOD__ALT) { // alt
 667                             if (MOD__SHIFT) sp_selection_move_screen(10, 0); // shift
 668                             else sp_selection_move_screen(1, 0); // no shift
 669                         }
 670                         else { // no alt
 671                             if (MOD__SHIFT) sp_selection_move(10*nudge, 0); // shift
 672                             else sp_selection_move(nudge, 0); // no shift
 673                         }
 674                         ret = TRUE;
 675                     }
 676                     break;
 677                 case GDK_Down: // move selection down
 678                 case GDK_KP_Down:
 679                 case GDK_KP_2:
 680                     if (!MOD__CTRL) { // not ctrl
 681                         if (MOD__ALT) { // alt
 682                             if (MOD__SHIFT) sp_selection_move_screen(0, -10); // shift
 683                             else sp_selection_move_screen(0, -1); // no shift
 684                         }
 685                         else { // no alt
 686                             if (MOD__SHIFT) sp_selection_move(0, -10*nudge); // shift
 687                             else sp_selection_move(0, -nudge); // no shift
 688                         }
 689                         ret = TRUE;
 690                     }
 691                     break;
 692                 case GDK_Escape:
 693                     if (!sp_select_context_abort(event_context))
 694                         selection->clear();
 695                     ret = TRUE;
 696                     break;
 697                 case GDK_a:
 698                 case GDK_A:
 699                     if (MOD__CTRL_ONLY) {
 700                         sp_edit_select_all();
 701                         ret = TRUE;
 702                     }
 703                     break;
 704                 case GDK_Tab: // Tab - cycle selection forward
 705                     if (!(MOD__CTRL_ONLY || (MOD__CTRL && MOD__SHIFT))) {
 706                         sp_selection_item_next();
 707                         ret = TRUE;
 708                     }
 709                     break;
 710                 case GDK_ISO_Left_Tab: // Shift Tab - cycle selection backward
 711                     if (!(MOD__CTRL_ONLY || (MOD__CTRL && MOD__SHIFT))) {
 712                         sp_selection_item_prev();
 713                         ret = TRUE;
 714                     }
 715                     break;
 716                 case GDK_space:
 717                     /* stamping mode: show outline mode moving */
 718                     /* FIXME: Is next condition ok? (lauris) */
 719                     if (sc->dragging && sc->grabbed) {
 720                         seltrans->stamp();
 721                         ret = TRUE;
 722                     }
 723                     break;
 724                 case GDK_x:
 725                 case GDK_X:
 726                     if (MOD__ALT_ONLY) {
 727                         desktop->setToolboxFocusTo ("altx");
 728                         ret = TRUE;
 729                     }
 730                     break;
 731                 case GDK_bracketleft:
 732                     if (MOD__ALT) {
 733                         sp_selection_rotate_screen(selection, 1);
 734                     } else if (MOD__CTRL) {
 735                         sp_selection_rotate(selection, 90);
 736                     } else if (snaps) {
 737                         sp_selection_rotate(selection, 180/snaps);
 738                     }
 739                     ret = TRUE;
 740                     break;
 741                 case GDK_bracketright:
 742                     if (MOD__ALT) {
 743                         sp_selection_rotate_screen(selection, -1);
 744                     } else if (MOD__CTRL) {
 745                         sp_selection_rotate(selection, -90);
 746                     } else if (snaps) {
 747                         sp_selection_rotate(selection, -180/snaps);
 748                     }
 749                     ret = TRUE;
 750                     break;
 751                 case GDK_less:
 752                 case GDK_comma:
 753                     if (MOD__ALT) {
 754                         sp_selection_scale_screen(selection, -2);
 755                     } else if (MOD__CTRL) {
 756                         sp_selection_scale_times(selection, 0.5);
 757                     } else {
 758                         sp_selection_scale(selection, -offset);
 759                     }
 760                     ret = TRUE;
 761                     break;
 762                 case GDK_greater:
 763                 case GDK_period:
 764                     if (MOD__ALT) {
 765                         sp_selection_scale_screen(selection, 2);
 766                     } else if (MOD__CTRL) {
 767                         sp_selection_scale_times(selection, 2);
 768                     } else {
 769                         sp_selection_scale(selection, offset);
 770                     }
 771                     ret = TRUE;
 772                     break;
 773                 case GDK_Return:
 774                     if (MOD__CTRL_ONLY) {
 775                         if (selection->singleItem()) {
 776                             SPItem *clicked_item = selection->singleItem();
 777                             if (SP_IS_GROUP (clicked_item)) { // enter group
 778                                 desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 779                                 SP_DT_SELECTION(desktop)->clear();
 780                             } else {
 781                                 SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Selected object is not a group. Cannot enter."));
 782                             }
 783                         }
 784                         ret = TRUE;
 785                     }
 786                     break;
 787                 case GDK_BackSpace:
 788                     if (MOD__CTRL_ONLY) {
 789                         sp_select_context_up_one_layer(desktop);
 790                         ret = TRUE;
 791                     }
 792                     break;
 793                 default:
 794                     break;
 795             }
 796             break;
 797         case GDK_KEY_RELEASE:
 798             if (key_is_a_modifier (get_group0_keyval (&event->key)))
 799                 event_context->defaultMessageContext()->clear();
 800             break;
 801         default:
 802             break;
 803     }
 804
 805     if (!ret) {
 806         if (((SPEventContextClass *) parent_class)->root_handler)
 807             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 808     }
 809
 810     return ret;
 811 }
 812
 813
 814 /*
 815   Local Variables:
 816   mode:c++
 817   c-file-style:"stroustrup"
 818   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 819   indent-tabs-mode:nil
 820   fill-column:99
 821   End:
 822 */
 823 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :