src/select-context.cpp

   1 #define __SP_SELECT_CONTEXT_C__
   2
   3 /*
   4  * Selection and transformation context
   5  *
   6  * Authors:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   bulia byak <buliabyak@users.sf.net>
   9  *
  10  * Copyright (C) 2006      Johan Engelen <johan@shouraizou.nl>
  11  * Copyright (C) 1999-2005 Authors
  12  *
  13  * Released under GNU GPL, read the file 'COPYING' for more information
  14  */
  15
  16 #ifdef HAVE_CONFIG_H
  17 # include "config.h"
  18 #endif
  19 #include <gdk/gdkkeysyms.h>
  20 #include "macros.h"
  21 #include "rubberband.h"
  22 #include "document.h"
  23 #include "selection.h"
  24 #include "seltrans-handles.h"
  25 #include "sp-cursor.h"
  26 #include "pixmaps/cursor-select-m.xpm"
  27 #include "pixmaps/cursor-select-d.xpm"
  28 #include "pixmaps/handles.xpm"
  29 #include <glibmm/i18n.h>
  30
  31 #include "select-context.h"
  32 #include "selection-chemistry.h"
  33 #include "desktop.h"
  34 #include "desktop-handles.h"
  35 #include "sp-root.h"
  36 #include "prefs-utils.h"
  37 #include "tools-switch.h"
  38 #include "message-stack.h"
  39 #include "selection-describer.h"
  40 #include "seltrans.h"
  41
  42 static void sp_select_context_class_init(SPSelectContextClass *klass);
  43 static void sp_select_context_init(SPSelectContext *select_context);
  44 static void sp_select_context_dispose(GObject *object);
  45
  46 static void sp_select_context_setup(SPEventContext *ec);
  47 static void sp_select_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  48 static gint sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  49 static gint sp_select_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  50
  51 static SPEventContextClass *parent_class;
  52
  53 static GdkCursor *CursorSelectMouseover = NULL;
  54 static GdkCursor *CursorSelectDragging = NULL;
  55 GdkPixbuf *handles[13];
  56
  57 static gint rb_escaped = 0; // if non-zero, rubberband was canceled by esc, so the next button release should not deselect
  58 static gint drag_escaped = 0; // if non-zero, drag was canceled by esc
  59
  60 static gint xp = 0, yp = 0; // where drag started
  61 static gint tolerance = 0;
  62 static bool within_tolerance = false;
  63
  64 GtkType
  65 sp_select_context_get_type(void)
  66 {
  67     static GType type = 0;
  68     if (!type) {
  69         GTypeInfo info = {
  70             sizeof(SPSelectContextClass),
  71             NULL, NULL,
  72             (GClassInitFunc) sp_select_context_class_init,
  73             NULL, NULL,
  74             sizeof(SPSelectContext),
  75             4,
  76             (GInstanceInitFunc) sp_select_context_init,
  77             NULL,   /* value_table */
  78         };
  79         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPSelectContext", &info, (GTypeFlags)0);
  80     }
  81     return type;
  82 }
  83
  84 static void
  85 sp_select_context_class_init(SPSelectContextClass *klass)
  86 {
  87     GObjectClass *object_class = (GObjectClass *) klass;
  88     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  89
  90     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
  91
  92     object_class->dispose = sp_select_context_dispose;
  93
  94     event_context_class->setup = sp_select_context_setup;
  95     event_context_class->set = sp_select_context_set;
  96     event_context_class->root_handler = sp_select_context_root_handler;
  97     event_context_class->item_handler = sp_select_context_item_handler;
  98
  99     // cursors in select context
 100     CursorSelectMouseover = sp_cursor_new_from_xpm(cursor_select_m_xpm , 1, 1);
 101     CursorSelectDragging = sp_cursor_new_from_xpm(cursor_select_d_xpm , 1, 1);
 102     // selection handles
 103     handles[0]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_nw_xpm);
 104     handles[1]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_ne_xpm);
 105     handles[2]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_h_xpm);
 106     handles[3]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_v_xpm);
 107     handles[4]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_nw_xpm);
 108     handles[5]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_n_xpm);
 109     handles[6]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_ne_xpm);
 110     handles[7]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_e_xpm);
 111     handles[8]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_se_xpm);
 112     handles[9]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_s_xpm);
 113     handles[10] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_sw_xpm);
 114     handles[11] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_w_xpm);
 115     handles[12] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_center_xpm);
 116
 117 }
 118
 119 static void
 120 sp_select_context_init(SPSelectContext *sc)
 121 {
 122     sc->dragging = FALSE;
 123     sc->moved = FALSE;
 124     sc->button_press_shift = false;
 125     sc->button_press_ctrl = false;
 126     sc->button_press_alt = false;
 127     sc->_seltrans = NULL;
 128     sc->_describer = NULL;
 129 }
 130
 131 static void
 132 sp_select_context_dispose(GObject *object)
 133 {
 134     SPSelectContext *sc = SP_SELECT_CONTEXT(object);
 135     SPEventContext * ec = SP_EVENT_CONTEXT (object);
 136
 137     ec->enableGrDrag(false);
 138
 139     if (sc->grabbed) {
 140         sp_canvas_item_ungrab(sc->grabbed, GDK_CURRENT_TIME);
 141         sc->grabbed = NULL;
 142     }
 143
 144     delete sc->_seltrans;
 145     sc->_seltrans = NULL;
 146     delete sc->_describer;
 147     sc->_describer = NULL;
 148
 149     if (CursorSelectDragging) {
 150         gdk_cursor_unref (CursorSelectDragging);
 151         CursorSelectDragging = NULL;
 152     }
 153     if (CursorSelectMouseover) {
 154         gdk_cursor_unref (CursorSelectMouseover);
 155         CursorSelectMouseover = NULL;
 156     }
 157
 158     G_OBJECT_CLASS(parent_class)->dispose(object);
 159 }
 160
 161 static void
 162 sp_select_context_setup(SPEventContext *ec)
 163 {
 164     SPSelectContext *select_context = SP_SELECT_CONTEXT(ec);
 165
 166     if (((SPEventContextClass *) parent_class)->setup) {
 167         ((SPEventContextClass *) parent_class)->setup(ec);
 168     }
 169
 170     SPDesktop *desktop = ec->desktop;
 171
 172     select_context->_describer = new Inkscape::SelectionDescriber(desktop->selection, desktop->messageStack());
 173
 174     select_context->_seltrans = new Inkscape::SelTrans(desktop);
 175
 176     sp_event_context_read(ec, "show");
 177     sp_event_context_read(ec, "transform");
 178
 179     if (prefs_get_int_attribute("tools.select", "gradientdrag", 0) != 0) {
 180         ec->enableGrDrag();
 181     }
 182 }
 183
 184 static void
 185 sp_select_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 186 {
 187     SPSelectContext *sc = SP_SELECT_CONTEXT(ec);
 188
 189     if (!strcmp(key, "show")) {
 190         if (val && !strcmp(val, "outline")) {
 191             sc->_seltrans->setShow(Inkscape::SelTrans::SHOW_OUTLINE);
 192         } else {
 193             sc->_seltrans->setShow(Inkscape::SelTrans::SHOW_CONTENT);
 194         }
 195     }
 196 }
 197
 198 static bool
 199 sp_select_context_abort(SPEventContext *event_context)
 200 {
 201     SPDesktop *desktop = event_context->desktop;
 202     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 203     Inkscape::SelTrans *seltrans = sc->_seltrans;
 204
 205     if (sc->dragging) {
 206         if (sc->moved) { // cancel dragging an object
 207             seltrans->ungrab();
 208             sc->moved = FALSE;
 209             sc->dragging = FALSE;
 210             drag_escaped = 1;
 211
 212             if (sc->item) {
 213                 // only undo if the item is still valid
 214                 if (SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))) {
 215                     sp_document_undo(sp_desktop_document(desktop));
 216                 }
 217
 218                 sp_object_unref( SP_OBJECT(sc->item), NULL);
 219             } else if (sc->button_press_ctrl) {
 220                 // NOTE:  This is a workaround to a bug.
 221                 // When the ctrl key is held, sc->item is not defined
 222                 // so in this case (only), we skip the object doc check
 223                 sp_document_undo(sp_desktop_document(desktop));
 224             }
 225             sc->item = NULL;
 226
 227             SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Move canceled."));
 228             return true;
 229         }
 230     } else {
 231         NR::Maybe<NR::Rect> const b = Inkscape::Rubberband::get()->getRectangle();
 232         if (b != NR::Nothing()) {
 233             Inkscape::Rubberband::get()->stop();
 234             rb_escaped = 1;
 235             SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Selection canceled."));
 236             return true;
 237         }
 238     }
 239     return false;
 240 }
 241
 242 bool
 243 key_is_a_modifier (guint key) {
 244     return (key == GDK_Alt_L ||
 245                 key == GDK_Alt_R ||
 246                 key == GDK_Control_L ||
 247                 key == GDK_Control_R ||
 248                 key == GDK_Shift_L ||
 249                 key == GDK_Shift_R ||
 250                 key == GDK_Meta_L ||  // Meta is when you press Shift+Alt (at least on my machine)
 251             key == GDK_Meta_R);
 252 }
 253
 254 void
 255 sp_select_context_up_one_layer(SPDesktop *desktop)
 256 {
 257     /* Click in empty place, go up one level -- but don't leave a layer to root.
 258      *
 259      * (Rationale: we don't usually allow users to go to the root, since that
 260      * detracts from the layer metaphor: objects at the root level can in front
 261      * of or behind layers.  Whereas it's fine to go to the root if editing
 262      * a document that has no layers (e.g. a non-Inkscape document).)
 263      *
 264      * Once we support editing SVG "islands" (e.g. <svg> embedded in an xhtml
 265      * document), we might consider further restricting the below to disallow
 266      * leaving a layer to go to a non-layer.
 267      */
 268     SPObject *const current_layer = desktop->currentLayer();
 269     if (current_layer) {
 270         SPObject *const parent = SP_OBJECT_PARENT(current_layer);
 271         if ( parent
 272              && ( SP_OBJECT_PARENT(parent)
 273                   || !( SP_IS_GROUP(current_layer)
 274                         && ( SPGroup::LAYER
 275                              == SP_GROUP(current_layer)->layerMode() ) ) ) )
 276         {
 277             desktop->setCurrentLayer(parent);
 278             if (SP_IS_GROUP(current_layer) && SPGroup::LAYER != SP_GROUP(current_layer)->layerMode())
 279                 sp_desktop_selection(desktop)->set(current_layer);
 280         }
 281     }
 282 }
 283
 284 static gint
 285 sp_select_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 286 {
 287     gint ret = FALSE;
 288
 289     SPDesktop *desktop = event_context->desktop;
 290     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 291     Inkscape::SelTrans *seltrans = sc->_seltrans;
 292
 293     tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 294
 295     // make sure we still have valid objects to move around
 296     if (sc->item && SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))==NULL) {
 297         sp_select_context_abort(event_context);
 298     }
 299
 300     switch (event->type) {
 301         case GDK_BUTTON_PRESS:
 302             if (event->button.button == 1) {
 303                 /* Left mousebutton */
 304
 305                 // save drag origin
 306                 xp = (gint) event->button.x;
 307                 yp = (gint) event->button.y;
 308                 within_tolerance = true;
 309
 310                 // remember what modifiers were on before button press
 311                 sc->button_press_shift = (event->button.state & GDK_SHIFT_MASK) ? true : false;
 312                 sc->button_press_ctrl = (event->button.state & GDK_CONTROL_MASK) ? true : false;
 313                 sc->button_press_alt = (event->button.state & GDK_MOD1_MASK) ? true : false;
 314
 315                 if (event->button.state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK)) {
 316                     // if shift or ctrl was pressed, do not move objects;
 317                     // pass the event to root handler which will perform rubberband, shift-click, ctrl-click, ctrl-drag
 318                 } else {
 319                     sc->dragging = TRUE;
 320                     sc->moved = FALSE;
 321
 322                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 323
 324                     // remember the clicked item in sc->item:
 325                     sc->item = sp_event_context_find_item (desktop,
 326                                               NR::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 327                     sp_object_ref(sc->item, NULL);
 328
 329                     rb_escaped = drag_escaped = 0;
 330
 331                     sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->drawing),
 332                                         GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_PRESS_MASK |
 333                                         GDK_POINTER_MOTION_MASK,
 334                                         NULL, event->button.time);
 335                     sc->grabbed = SP_CANVAS_ITEM(desktop->drawing);
 336
 337                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 338
 339                     ret = TRUE;
 340                 }
 341             } else if (event->button.button == 3) {
 342                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 343                 sp_select_context_abort(event_context);
 344             }
 345             break;
 346
 347         case GDK_ENTER_NOTIFY:
 348         {
 349             GdkCursor *cursor = gdk_cursor_new(GDK_FLEUR);
 350             gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, cursor);
 351             gdk_cursor_destroy(cursor);
 352             break;
 353         }
 354
 355         case GDK_LEAVE_NOTIFY:
 356             gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
 357             break;
 358
 359         case GDK_KEY_PRESS:
 360             if (get_group0_keyval (&event->key) == GDK_space) {
 361                 if (sc->dragging && sc->grabbed) {
 362                     /* stamping mode: show content mode moving */
 363                     seltrans->stamp();
 364                     ret = TRUE;
 365                 }
 366             }
 367             break;
 368
 369         default:
 370             break;
 371     }
 372
 373     if (!ret) {
 374         if (((SPEventContextClass *) parent_class)->item_handler)
 375             ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 376     }
 377
 378     return ret;
 379 }
 380
 381 static gint
 382 sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 383 {
 384     SPItem *item = NULL;
 385     SPItem *item_at_point = NULL, *group_at_point = NULL, *item_in_group = NULL;
 386     gint ret = FALSE;
 387
 388     SPDesktop *desktop = event_context->desktop;
 389     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 390     Inkscape::SelTrans *seltrans = sc->_seltrans;
 391     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 392     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 393     gdouble const offset = prefs_get_double_attribute_limited("options.defaultscale", "value", 2, 0, 1000);
 394     tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 395     int const snaps = prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12);
 396
 397     // make sure we still have valid objects to move around
 398     if (sc->item && SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))==NULL) {
 399         sp_select_context_abort(event_context);
 400     }
 401
 402     switch (event->type) {
 403         case GDK_2BUTTON_PRESS:
 404             if (event->button.button == 1) {
 405                 if (!selection->isEmpty()) {
 406                     SPItem *clicked_item = (SPItem *) selection->itemList()->data;
 407                     if (SP_IS_GROUP (clicked_item)) { // enter group
 408                         desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 409                         sp_desktop_selection(desktop)->clear();
 410                         sc->dragging = false;
 411
 412                         sp_canvas_end_forced_full_redraws(desktop->canvas);
 413                     } else { // switch tool
 414                         tools_switch_by_item (desktop, clicked_item);
 415                     }
 416                 } else {
 417                     sp_select_context_up_one_layer(desktop);
 418                 }
 419                 ret = TRUE;
 420             }
 421             break;
 422         case GDK_BUTTON_PRESS:
 423             if (event->button.button == 1) {
 424
 425                 // save drag origin
 426                 xp = (gint) event->button.x;
 427                 yp = (gint) event->button.y;
 428                 within_tolerance = true;
 429
 430                 NR::Point const button_pt(event->button.x, event->button.y);
 431                 NR::Point const p(desktop->w2d(button_pt));
 432                 Inkscape::Rubberband::get()->start(desktop, p);
 433                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 434                                     GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK,
 435                                     NULL, event->button.time);
 436                 sc->grabbed = SP_CANVAS_ITEM(desktop->acetate);
 437
 438                 // remember what modifiers were on before button press
 439                 sc->button_press_shift = (event->button.state & GDK_SHIFT_MASK) ? true : false;
 440                 sc->button_press_ctrl = (event->button.state & GDK_CONTROL_MASK) ? true : false;
 441                 sc->button_press_alt = (event->button.state & GDK_MOD1_MASK) ? true : false;
 442
 443                 sc->moved = FALSE;
 444
 445                 rb_escaped = drag_escaped = 0;
 446
 447                 ret = TRUE;
 448             } else if (event->button.button == 3) {
 449                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 450                 sp_select_context_abort(event_context);
 451             }
 452             break;
 453
 454         case GDK_MOTION_NOTIFY:
 455             if (event->motion.state & GDK_BUTTON1_MASK) {
 456                 NR::Point const motion_pt(event->motion.x, event->motion.y);
 457                 NR::Point const p(desktop->w2d(motion_pt));
 458
 459                 if ( within_tolerance
 460                      && ( abs( (gint) event->motion.x - xp ) < tolerance )
 461                      && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
 462                     break; // do not drag if we're within tolerance from origin
 463                 }
 464                 // Once the user has moved farther than tolerance from the original location
 465                 // (indicating they intend to move the object, not click), then always process the
 466                 // motion notify coordinates as given (no snapping back to origin)
 467                 within_tolerance = false;
 468
 469                 if (sc->button_press_ctrl || sc->button_press_alt) {
 470                     // if ctrl or alt was pressed and it's not click, we want to drag rather than rubberband
 471                     sc->dragging = TRUE;
 472
 473                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 474                 }
 475
 476                 if (sc->dragging) {
 477                     /* User has dragged fast, so we get events on root (lauris)*/
 478                     // not only that; we will end up here when ctrl-dragging as well
 479                     // and also when we started within tolerance, but trespassed tolerance outside of item
 480                     Inkscape::Rubberband::get()->stop();
 481                     item_at_point = desktop->item_at_point(NR::Point(event->button.x, event->button.y), FALSE);
 482                     if (!item_at_point) // if no item at this point, try at the click point (bug 1012200)
 483                         item_at_point = desktop->item_at_point(NR::Point(xp, yp), FALSE);
 484                     if (item_at_point || sc->moved || sc->button_press_alt) {
 485                         // drag only if starting from an item, or if something is already grabbed, or if alt-dragging
 486                         if (!sc->moved) {
 487                             item_in_group = desktop->item_at_point(NR::Point(event->button.x, event->button.y), TRUE);
 488                             group_at_point = desktop->group_at_point(NR::Point(event->button.x, event->button.y));
 489                             // if neither a group nor an item (possibly in a group) at point are selected, set selection to the item at point
 490                             if ((!item_in_group || !selection->includes(item_in_group)) &&
 491                                 (!group_at_point || !selection->includes(group_at_point))
 492                                 && !sc->button_press_alt) {
 493                                 // select what is under cursor
 494                                 if (!seltrans->isEmpty()) {
 495                                     seltrans->resetState();
 496                                 }
 497                                 // when simply ctrl-dragging, we don't want to go into groups
 498                                 if (item_at_point && !selection->includes(item_at_point))
 499                                     selection->set(item_at_point);
 500                             } // otherwise, do not change selection so that dragging selected-within-group items, as well as alt-dragging, is possible
 501                             seltrans->grab(p, -1, -1, FALSE);
 502                             sc->moved = TRUE;
 503                         }
 504                         if (!seltrans->isEmpty())
 505                             seltrans->moveTo(p, event->button.state);
 506                         if (desktop->scroll_to_point(&p))
 507                             // unfortunately in complex drawings, gobbling results in losing grab of the object, for some mysterious reason
 508                             ; //gobble_motion_events(GDK_BUTTON1_MASK);
 509                         ret = TRUE;
 510                     } else {
 511                         sc->dragging = FALSE;
 512
 513                         sp_canvas_end_forced_full_redraws(desktop->canvas);
 514                     }
 515                 } else {
 516                     Inkscape::Rubberband::get()->move(p);
 517                     gobble_motion_events(GDK_BUTTON1_MASK);
 518                 }
 519             }
 520             break;
 521         case GDK_BUTTON_RELEASE:
 522             xp = yp = 0;
 523             if ((event->button.button == 1) && (sc->grabbed)) {
 524                 if (sc->dragging) {
 525                     if (sc->moved) {
 526                         // item has been moved
 527                         seltrans->ungrab();
 528                         sc->moved = FALSE;
 529                     } else if (sc->item && !drag_escaped) {
 530                         // item has not been moved -> simply a click, do selecting
 531                         if (!selection->isEmpty()) {
 532                             if (event->button.state & GDK_SHIFT_MASK) {
 533                                 // with shift, toggle selection
 534                                 seltrans->resetState();
 535                                 selection->toggle(sc->item);
 536                             } else {
 537                                 // without shift, increase state (i.e. toggle scale/rotation handles)
 538                                 if (selection->includes(sc->item)) {
 539                                     seltrans->increaseState();
 540                                 } else {
 541                                     seltrans->resetState();
 542                                     selection->set(sc->item);
 543                                 }
 544                             }
 545                         } else { // simple or shift click, no previous selection
 546                             seltrans->resetState();
 547                             selection->set(sc->item);
 548                         }
 549                     }
 550                     sc->dragging = FALSE;
 551
 552                     sp_canvas_end_forced_full_redraws(desktop->canvas);
 553
 554                     if (sc->item) {
 555                         sp_object_unref( SP_OBJECT(sc->item), NULL);
 556                     }
 557                     sc->item = NULL;
 558                 } else {
 559                     NR::Maybe<NR::Rect> const b = Inkscape::Rubberband::get()->getRectangle();
 560                     if (b != NR::Nothing() && !within_tolerance) {
 561                         // this was a rubberband drag
 562                         Inkscape::Rubberband::get()->stop();
 563                         seltrans->resetState();
 564                         // find out affected items:
 565                         GSList *items = sp_document_items_in_box(sp_desktop_document(desktop), desktop->dkey, b.assume());
 566                         if (event->button.state & GDK_SHIFT_MASK) {
 567                             // with shift, add to selection
 568                             selection->addList (items);
 569                         } else {
 570                             // without shift, simply select anew
 571                             selection->setList (items);
 572                         }
 573                         g_slist_free (items);
 574                     } else { // it was just a click, or a too small rubberband
 575                         Inkscape::Rubberband::get()->stop();
 576                         if (sc->button_press_shift && !rb_escaped && !drag_escaped) {
 577                             // this was a shift-click, select what was clicked upon
 578
 579                             sc->button_press_shift = false;
 580
 581                             if (sc->button_press_ctrl) {
 582                                 // go into groups, honoring Alt
 583                                 item = sp_event_context_find_item (desktop,
 584                                                    NR::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, TRUE);
 585                                 sc->button_press_ctrl = FALSE;
 586                             } else {
 587                                 // don't go into groups, honoring Alt
 588                                 item = sp_event_context_find_item (desktop,
 589                                                    NR::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 590                             }
 591
 592                             if (item) {
 593                                 selection->toggle(item);
 594                                 item = NULL;
 595                             }
 596
 597                         } else if (sc->button_press_ctrl && !rb_escaped && !drag_escaped) { // ctrl-click
 598
 599                             sc->button_press_ctrl = FALSE;
 600
 601                             item = sp_event_context_find_item (desktop,
 602                                          NR::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, TRUE);
 603
 604                             if (item) {
 605                                 if (selection->includes(item)) {
 606                                     seltrans->increaseState();
 607                                 } else {
 608                                     seltrans->resetState();
 609                                     selection->set(item);
 610                                 }
 611                                 item = NULL;
 612                             }
 613
 614                         } else { // click without shift, simply deselect, unless with Alt or something was cancelled
 615                             if (!selection->isEmpty()) {
 616                                 if (!(rb_escaped) && !(drag_escaped) && !(event->button.state & GDK_MOD1_MASK))
 617                                     selection->clear();
 618                                 rb_escaped = 0;
 619                                 ret = TRUE;
 620                             }
 621                         }
 622                     }
 623                     ret = TRUE;
 624                 }
 625                 if (sc->grabbed) {
 626                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 627                     sc->grabbed = NULL;
 628                 }
 629
 630                 desktop->updateNow();
 631             }
 632             sc->button_press_shift = false;
 633             sc->button_press_ctrl = false;
 634             sc->button_press_alt = false;
 635             break;
 636
 637         case GDK_KEY_PRESS: // keybindings for select context
 638
 639             if (!key_is_a_modifier (get_group0_keyval (&event->key))) {
 640                     event_context->defaultMessageContext()->clear();
 641             } else if (sc->grabbed || seltrans->isGrabbed()) {
 642                 // do not change the statusbar text when mousekey is down to move or transform the object,
 643                 // because the statusbar text is already updated somewhere else.
 644                    break;
 645             } else {
 646                     sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
 647                                                 _("<b>Ctrl</b>: select in groups, move hor/vert"),
 648                                                 _("<b>Shift</b>: toggle select, force rubberband, disable snapping"),
 649                                                 _("<b>Alt</b>: select under, move selected"));
 650                     // if Alt then change cursor to moving cursor:
 651                     guint keyval = get_group0_keyval(&event->key);
 652                     bool alt = ( MOD__ALT
 653                                     || (keyval == GDK_Alt_L)
 654                                     || (keyval == GDK_Alt_R)
 655                                     || (keyval == GDK_Meta_L)
 656                                     || (keyval == GDK_Meta_R));
 657                     if (alt) {
 658                         GdkCursor *cursor = gdk_cursor_new(GDK_FLEUR);
 659                         gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, cursor);
 660                         gdk_cursor_destroy(cursor);
 661                     }
 662                     //*/
 663                     break;
 664             }
 665
 666             switch (get_group0_keyval (&event->key)) {
 667                 case GDK_Left: // move selection left
 668                 case GDK_KP_Left:
 669                 case GDK_KP_4:
 670                     if (!MOD__CTRL) { // not ctrl
 671                         if (MOD__ALT) { // alt
 672                             if (MOD__SHIFT) sp_selection_move_screen(-10, 0); // shift
 673                             else sp_selection_move_screen(-1, 0); // no shift
 674                         }
 675                         else { // no alt
 676                             if (MOD__SHIFT) sp_selection_move(-10*nudge, 0); // shift
 677                             else sp_selection_move(-nudge, 0); // no shift
 678                         }
 679                         ret = TRUE;
 680                     }
 681                     break;
 682                 case GDK_Up: // move selection up
 683                 case GDK_KP_Up:
 684                 case GDK_KP_8:
 685                     if (!MOD__CTRL) { // not ctrl
 686                         if (MOD__ALT) { // alt
 687                             if (MOD__SHIFT) sp_selection_move_screen(0, 10); // shift
 688                             else sp_selection_move_screen(0, 1); // no shift
 689                         }
 690                         else { // no alt
 691                             if (MOD__SHIFT) sp_selection_move(0, 10*nudge); // shift
 692                             else sp_selection_move(0, nudge); // no shift
 693                         }
 694                         ret = TRUE;
 695                     }
 696                     break;
 697                 case GDK_Right: // move selection right
 698                 case GDK_KP_Right:
 699                 case GDK_KP_6:
 700                     if (!MOD__CTRL) { // not ctrl
 701                         if (MOD__ALT) { // alt
 702                             if (MOD__SHIFT) sp_selection_move_screen(10, 0); // shift
 703                             else sp_selection_move_screen(1, 0); // no shift
 704                         }
 705                         else { // no alt
 706                             if (MOD__SHIFT) sp_selection_move(10*nudge, 0); // shift
 707                             else sp_selection_move(nudge, 0); // no shift
 708                         }
 709                         ret = TRUE;
 710                     }
 711                     break;
 712                 case GDK_Down: // move selection down
 713                 case GDK_KP_Down:
 714                 case GDK_KP_2:
 715                     if (!MOD__CTRL) { // not ctrl
 716                         if (MOD__ALT) { // alt
 717                             if (MOD__SHIFT) sp_selection_move_screen(0, -10); // shift
 718                             else sp_selection_move_screen(0, -1); // no shift
 719                         }
 720                         else { // no alt
 721                             if (MOD__SHIFT) sp_selection_move(0, -10*nudge); // shift
 722                             else sp_selection_move(0, -nudge); // no shift
 723                         }
 724                         ret = TRUE;
 725                     }
 726                     break;
 727                 case GDK_Escape:
 728                     if (!sp_select_context_abort(event_context))
 729                         selection->clear();
 730                     ret = TRUE;
 731                     break;
 732                 case GDK_a:
 733                 case GDK_A:
 734                     if (MOD__CTRL_ONLY) {
 735                         sp_edit_select_all();
 736                         ret = TRUE;
 737                     }
 738                     break;
 739                 case GDK_Tab: // Tab - cycle selection forward
 740                     if (!(MOD__CTRL_ONLY || (MOD__CTRL && MOD__SHIFT))) {
 741                         sp_selection_item_next();
 742                         ret = TRUE;
 743                     }
 744                     break;
 745                 case GDK_ISO_Left_Tab: // Shift Tab - cycle selection backward
 746                     if (!(MOD__CTRL_ONLY || (MOD__CTRL && MOD__SHIFT))) {
 747                         sp_selection_item_prev();
 748                         ret = TRUE;
 749                     }
 750                     break;
 751                 case GDK_space:
 752                     /* stamping mode: show outline mode moving */
 753                     /* FIXME: Is next condition ok? (lauris) */
 754                     if (sc->dragging && sc->grabbed) {
 755                         seltrans->stamp();
 756                         ret = TRUE;
 757                     }
 758                     break;
 759                 case GDK_x:
 760                 case GDK_X:
 761                     if (MOD__ALT_ONLY) {
 762                         desktop->setToolboxFocusTo ("altx");
 763                         ret = TRUE;
 764                     }
 765                     break;
 766                 case GDK_bracketleft:
 767                     if (MOD__ALT) {
 768                         sp_selection_rotate_screen(selection, 1);
 769                     } else if (MOD__CTRL) {
 770                         sp_selection_rotate(selection, 90);
 771                     } else if (snaps) {
 772                         sp_selection_rotate(selection, 180/snaps);
 773                     }
 774                     ret = TRUE;
 775                     break;
 776                 case GDK_bracketright:
 777                     if (MOD__ALT) {
 778                         sp_selection_rotate_screen(selection, -1);
 779                     } else if (MOD__CTRL) {
 780                         sp_selection_rotate(selection, -90);
 781                     } else if (snaps) {
 782                         sp_selection_rotate(selection, -180/snaps);
 783                     }
 784                     ret = TRUE;
 785                     break;
 786                 case GDK_less:
 787                 case GDK_comma:
 788                     if (MOD__ALT) {
 789                         sp_selection_scale_screen(selection, -2);
 790                     } else if (MOD__CTRL) {
 791                         sp_selection_scale_times(selection, 0.5);
 792                     } else {
 793                         sp_selection_scale(selection, -offset);
 794                     }
 795                     ret = TRUE;
 796                     break;
 797                 case GDK_greater:
 798                 case GDK_period:
 799                     if (MOD__ALT) {
 800                         sp_selection_scale_screen(selection, 2);
 801                     } else if (MOD__CTRL) {
 802                         sp_selection_scale_times(selection, 2);
 803                     } else {
 804                         sp_selection_scale(selection, offset);
 805                     }
 806                     ret = TRUE;
 807                     break;
 808                 case GDK_Return:
 809                     if (MOD__CTRL_ONLY) {
 810                         if (selection->singleItem()) {
 811                             SPItem *clicked_item = selection->singleItem();
 812                             if (SP_IS_GROUP (clicked_item)) { // enter group
 813                                 desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 814                                 sp_desktop_selection(desktop)->clear();
 815                             } else {
 816                                 SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Selected object is not a group. Cannot enter."));
 817                             }
 818                         }
 819                         ret = TRUE;
 820                     }
 821                     break;
 822                 case GDK_BackSpace:
 823                     if (MOD__CTRL_ONLY) {
 824                         sp_select_context_up_one_layer(desktop);
 825                         ret = TRUE;
 826                     }
 827                     break;
 828                 default:
 829                     break;
 830             }
 831             break;
 832         case GDK_KEY_RELEASE:
 833             if (key_is_a_modifier (get_group0_keyval (&event->key)))
 834                 event_context->defaultMessageContext()->clear();
 835                 // set cursor to default.
 836                 gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
 837             break;
 838         default:
 839             break;
 840     }
 841
 842     if (!ret) {
 843         if (((SPEventContextClass *) parent_class)->root_handler)
 844             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 845     }
 846
 847     return ret;
 848 }
 849
 850
 851 /*
 852   Local Variables:
 853   mode:c++
 854   c-file-style:"stroustrup"
 855   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 856   indent-tabs-mode:nil
 857   fill-column:99
 858   End:
 859 */
 860 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :