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 <cstring>
  20 #include <string>
  21 #include <gdk/gdkkeysyms.h>
  22 #include "macros.h"
  23 #include "rubberband.h"
  24 #include "document.h"
  25 #include "selection.h"
  26 #include "seltrans-handles.h"
  27 #include "sp-cursor.h"
  28 #include "pixmaps/cursor-select-m.xpm"
  29 #include "pixmaps/cursor-select-d.xpm"
  30 #include "pixmaps/handles.xpm"
  31 #include <glibmm/i18n.h>
  32
  33 #include "select-context.h"
  34 #include "selection-chemistry.h"
  35 #include "desktop.h"
  36 #include "desktop-handles.h"
  37 #include "sp-root.h"
  38 #include "preferences.h"
  39 #include "tools-switch.h"
  40 #include "message-stack.h"
  41 #include "selection-describer.h"
  42 #include "seltrans.h"
  43 #include "box3d.h"
  44
  45 static void sp_select_context_class_init(SPSelectContextClass *klass);
  46 static void sp_select_context_init(SPSelectContext *select_context);
  47 static void sp_select_context_dispose(GObject *object);
  48
  49 static void sp_select_context_setup(SPEventContext *ec);
  50 static void sp_select_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val);
  51 static gint sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  52 static gint sp_select_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  53
  54 static SPEventContextClass *parent_class;
  55
  56 static GdkCursor *CursorSelectMouseover = NULL;
  57 static GdkCursor *CursorSelectDragging = NULL;
  58 GdkPixbuf *handles[13];
  59
  60 static gint rb_escaped = 0; // if non-zero, rubberband was canceled by esc, so the next button release should not deselect
  61 static gint drag_escaped = 0; // if non-zero, drag was canceled by esc
  62
  63 static gint xp = 0, yp = 0; // where drag started
  64 static gint tolerance = 0;
  65 static bool within_tolerance = false;
  66
  67 GtkType
  68 sp_select_context_get_type(void)
  69 {
  70     static GType type = 0;
  71     if (!type) {
  72         GTypeInfo info = {
  73             sizeof(SPSelectContextClass),
  74             NULL, NULL,
  75             (GClassInitFunc) sp_select_context_class_init,
  76             NULL, NULL,
  77             sizeof(SPSelectContext),
  78             4,
  79             (GInstanceInitFunc) sp_select_context_init,
  80             NULL,   /* value_table */
  81         };
  82         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPSelectContext", &info, (GTypeFlags)0);
  83     }
  84     return type;
  85 }
  86
  87 static void
  88 sp_select_context_class_init(SPSelectContextClass *klass)
  89 {
  90     GObjectClass *object_class = (GObjectClass *) klass;
  91     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  92
  93     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
  94
  95     object_class->dispose = sp_select_context_dispose;
  96
  97     event_context_class->setup = sp_select_context_setup;
  98     event_context_class->set = sp_select_context_set;
  99     event_context_class->root_handler = sp_select_context_root_handler;
 100     event_context_class->item_handler = sp_select_context_item_handler;
 101
 102     // cursors in select context
 103     CursorSelectMouseover = sp_cursor_new_from_xpm(cursor_select_m_xpm , 1, 1);
 104     CursorSelectDragging = sp_cursor_new_from_xpm(cursor_select_d_xpm , 1, 1);
 105     // selection handles
 106     handles[0]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_nw_xpm);
 107     handles[1]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_ne_xpm);
 108     handles[2]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_h_xpm);
 109     handles[3]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_v_xpm);
 110     handles[4]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_nw_xpm);
 111     handles[5]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_n_xpm);
 112     handles[6]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_ne_xpm);
 113     handles[7]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_e_xpm);
 114     handles[8]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_se_xpm);
 115     handles[9]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_s_xpm);
 116     handles[10] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_sw_xpm);
 117     handles[11] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_w_xpm);
 118     handles[12] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_center_xpm);
 119
 120 }
 121
 122 static void
 123 sp_select_context_init(SPSelectContext *sc)
 124 {
 125     sc->dragging = FALSE;
 126     sc->moved = FALSE;
 127     sc->button_press_shift = false;
 128     sc->button_press_ctrl = false;
 129     sc->button_press_alt = false;
 130     sc->_seltrans = NULL;
 131     sc->_describer = NULL;
 132 }
 133
 134 static void
 135 sp_select_context_dispose(GObject *object)
 136 {
 137     SPSelectContext *sc = SP_SELECT_CONTEXT(object);
 138     SPEventContext * ec = SP_EVENT_CONTEXT (object);
 139
 140     ec->enableGrDrag(false);
 141
 142     if (sc->grabbed) {
 143         sp_canvas_item_ungrab(sc->grabbed, GDK_CURRENT_TIME);
 144         sc->grabbed = NULL;
 145     }
 146
 147     delete sc->_seltrans;
 148     sc->_seltrans = NULL;
 149     delete sc->_describer;
 150     sc->_describer = NULL;
 151
 152     if (CursorSelectDragging) {
 153         gdk_cursor_unref (CursorSelectDragging);
 154         CursorSelectDragging = NULL;
 155     }
 156     if (CursorSelectMouseover) {
 157         gdk_cursor_unref (CursorSelectMouseover);
 158         CursorSelectMouseover = NULL;
 159     }
 160
 161     G_OBJECT_CLASS(parent_class)->dispose(object);
 162 }
 163
 164 static void
 165 sp_select_context_setup(SPEventContext *ec)
 166 {
 167     SPSelectContext *select_context = SP_SELECT_CONTEXT(ec);
 168
 169     if (((SPEventContextClass *) parent_class)->setup) {
 170         ((SPEventContextClass *) parent_class)->setup(ec);
 171     }
 172
 173     SPDesktop *desktop = ec->desktop;
 174
 175     select_context->_describer = new Inkscape::SelectionDescriber(desktop->selection, desktop->messageStack());
 176
 177     select_context->_seltrans = new Inkscape::SelTrans(desktop);
 178
 179     sp_event_context_read(ec, "show");
 180     sp_event_context_read(ec, "transform");
 181
 182     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 183     if (prefs->getBool("/tools/select/gradientdrag")) {
 184         ec->enableGrDrag();
 185     }
 186 }
 187
 188 static void
 189 sp_select_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val)
 190 {
 191     SPSelectContext *sc = SP_SELECT_CONTEXT(ec);
 192     Glib::ustring path = val->getEntryName();
 193
 194     if (path == "show") {
 195         if (val->getString() == "outline") {
 196             sc->_seltrans->setShow(Inkscape::SelTrans::SHOW_OUTLINE);
 197         } else {
 198             sc->_seltrans->setShow(Inkscape::SelTrans::SHOW_CONTENT);
 199         }
 200     }
 201 }
 202
 203 static bool
 204 sp_select_context_abort(SPEventContext *event_context)
 205 {
 206     SPDesktop *desktop = event_context->desktop;
 207     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 208     Inkscape::SelTrans *seltrans = sc->_seltrans;
 209
 210     if (sc->dragging) {
 211         if (sc->moved) { // cancel dragging an object
 212             seltrans->ungrab();
 213             sc->moved = FALSE;
 214             sc->dragging = FALSE;
 215             sp_event_context_snap_window_closed(event_context);
 216             drag_escaped = 1;
 217
 218             if (sc->item) {
 219                 // only undo if the item is still valid
 220                 if (SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))) {
 221                     sp_document_undo(sp_desktop_document(desktop));
 222                 }
 223
 224                 sp_object_unref( SP_OBJECT(sc->item), NULL);
 225             } else if (sc->button_press_ctrl) {
 226                 // NOTE:  This is a workaround to a bug.
 227                 // When the ctrl key is held, sc->item is not defined
 228                 // so in this case (only), we skip the object doc check
 229                 sp_document_undo(sp_desktop_document(desktop));
 230             }
 231             sc->item = NULL;
 232
 233             SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Move canceled."));
 234             return true;
 235         }
 236     } else {
 237         if (Inkscape::Rubberband::get(desktop)->is_started()) {
 238             Inkscape::Rubberband::get(desktop)->stop();
 239             rb_escaped = 1;
 240             SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 241             SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Selection canceled."));
 242             return true;
 243         }
 244     }
 245     return false;
 246 }
 247
 248 bool
 249 key_is_a_modifier (guint key) {
 250     return (key == GDK_Alt_L ||
 251                 key == GDK_Alt_R ||
 252                 key == GDK_Control_L ||
 253                 key == GDK_Control_R ||
 254                 key == GDK_Shift_L ||
 255                 key == GDK_Shift_R ||
 256                 key == GDK_Meta_L ||  // Meta is when you press Shift+Alt (at least on my machine)
 257             key == GDK_Meta_R);
 258 }
 259
 260 void
 261 sp_select_context_up_one_layer(SPDesktop *desktop)
 262 {
 263     /* Click in empty place, go up one level -- but don't leave a layer to root.
 264      *
 265      * (Rationale: we don't usually allow users to go to the root, since that
 266      * detracts from the layer metaphor: objects at the root level can in front
 267      * of or behind layers.  Whereas it's fine to go to the root if editing
 268      * a document that has no layers (e.g. a non-Inkscape document).)
 269      *
 270      * Once we support editing SVG "islands" (e.g. <svg> embedded in an xhtml
 271      * document), we might consider further restricting the below to disallow
 272      * leaving a layer to go to a non-layer.
 273      */
 274     SPObject *const current_layer = desktop->currentLayer();
 275     if (current_layer) {
 276         SPObject *const parent = SP_OBJECT_PARENT(current_layer);
 277         if ( parent
 278              && ( SP_OBJECT_PARENT(parent)
 279                   || !( SP_IS_GROUP(current_layer)
 280                         && ( SPGroup::LAYER
 281                              == SP_GROUP(current_layer)->layerMode() ) ) ) )
 282         {
 283             desktop->setCurrentLayer(parent);
 284             if (SP_IS_GROUP(current_layer) && SPGroup::LAYER != SP_GROUP(current_layer)->layerMode())
 285                 sp_desktop_selection(desktop)->set(current_layer);
 286         }
 287     }
 288 }
 289
 290 static gint
 291 sp_select_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 292 {
 293     gint ret = FALSE;
 294
 295     SPDesktop *desktop = event_context->desktop;
 296     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 297     Inkscape::SelTrans *seltrans = sc->_seltrans;
 298
 299     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 300     tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 301
 302     // make sure we still have valid objects to move around
 303     if (sc->item && SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))==NULL) {
 304         sp_select_context_abort(event_context);
 305     }
 306
 307     switch (event->type) {
 308         case GDK_BUTTON_PRESS:
 309             if (event->button.button == 1 && !event_context->space_panning) {
 310                 /* Left mousebutton */
 311
 312                 // save drag origin
 313                 xp = (gint) event->button.x;
 314                 yp = (gint) event->button.y;
 315                 within_tolerance = true;
 316
 317                 // remember what modifiers were on before button press
 318                 sc->button_press_shift = (event->button.state & GDK_SHIFT_MASK) ? true : false;
 319                 sc->button_press_ctrl = (event->button.state & GDK_CONTROL_MASK) ? true : false;
 320                 sc->button_press_alt = (event->button.state & GDK_MOD1_MASK) ? true : false;
 321
 322                 if (event->button.state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK | GDK_MOD1_MASK)) {
 323                     // if shift or ctrl was pressed, do not move objects;
 324                     // pass the event to root handler which will perform rubberband, shift-click, ctrl-click, ctrl-drag
 325                 } else {
 326                     sc->dragging = TRUE;
 327                     sp_event_context_snap_window_open(event_context);
 328                     sc->moved = FALSE;
 329
 330                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 331
 332                     // remember the clicked item in sc->item:
 333                     if (sc->item) {
 334                         sp_object_unref(sc->item, NULL);
 335                         sc->item = NULL;
 336                     }
 337                     sc->item = sp_event_context_find_item (desktop,
 338                                               Geom::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 339                     sp_object_ref(sc->item, NULL);
 340
 341                     rb_escaped = drag_escaped = 0;
 342
 343                     if (sc->grabbed) {
 344                         sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 345                         sc->grabbed = NULL;
 346                     }
 347                     sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->drawing),
 348                                         GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_PRESS_MASK |
 349                                         GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK,
 350                                         NULL, event->button.time);
 351                     sc->grabbed = SP_CANVAS_ITEM(desktop->drawing);
 352
 353                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 354
 355                     ret = TRUE;
 356                 }
 357             } else if (event->button.button == 3) {
 358                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 359                 sp_select_context_abort(event_context);
 360             }
 361             break;
 362
 363         case GDK_ENTER_NOTIFY:
 364         {
 365             if (!desktop->isWaitingCursor()) {
 366                 GdkCursor *cursor = gdk_cursor_new(GDK_FLEUR);
 367                 gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, cursor);
 368                 gdk_cursor_destroy(cursor);
 369             }
 370             break;
 371         }
 372
 373         case GDK_LEAVE_NOTIFY:
 374             if (!desktop->isWaitingCursor())
 375                 gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
 376             break;
 377
 378         case GDK_KEY_PRESS:
 379             if (get_group0_keyval (&event->key) == GDK_space) {
 380                 if (sc->dragging && sc->grabbed) {
 381                     /* stamping mode: show content mode moving */
 382                     seltrans->stamp();
 383                     ret = TRUE;
 384                 }
 385             }
 386             break;
 387
 388         default:
 389             break;
 390     }
 391
 392     if (!ret) {
 393         if (((SPEventContextClass *) parent_class)->item_handler)
 394             ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 395     }
 396
 397     return ret;
 398 }
 399
 400 static gint
 401 sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 402 {
 403     SPItem *item = NULL;
 404     SPItem *item_at_point = NULL, *group_at_point = NULL, *item_in_group = NULL;
 405     gint ret = FALSE;
 406
 407     SPDesktop *desktop = event_context->desktop;
 408     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 409     Inkscape::SelTrans *seltrans = sc->_seltrans;
 410     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 411     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 412
 413     gdouble const nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000); // in px
 414     gdouble const offset = prefs->getDoubleLimited("/options/defaultscale/value", 2, 0, 1000);
 415     tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 416     int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
 417
 418     // make sure we still have valid objects to move around
 419     if (sc->item && SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))==NULL) {
 420         sp_select_context_abort(event_context);
 421     }
 422
 423     switch (event->type) {
 424         case GDK_2BUTTON_PRESS:
 425             if (event->button.button == 1) {
 426                 if (!selection->isEmpty()) {
 427                     SPItem *clicked_item = (SPItem *) selection->itemList()->data;
 428                     if (SP_IS_GROUP(clicked_item) && !SP_IS_BOX3D(clicked_item)) { // enter group if it's not a 3D box
 429                         desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 430                         sp_desktop_selection(desktop)->clear();
 431                         sc->dragging = false;
 432                         sp_event_context_snap_window_closed(event_context);
 433
 434                         sp_canvas_end_forced_full_redraws(desktop->canvas);
 435                     } else { // switch tool
 436                         Geom::Point const button_pt(event->button.x, event->button.y);
 437                         Geom::Point const p(desktop->w2d(button_pt));
 438                         tools_switch_by_item (desktop, clicked_item, p);
 439                     }
 440                 } else {
 441                     sp_select_context_up_one_layer(desktop);
 442                 }
 443                 ret = TRUE;
 444             }
 445             break;
 446         case GDK_BUTTON_PRESS:
 447             if (event->button.button == 1 && !event_context->space_panning) {
 448
 449                 // save drag origin
 450                 xp = (gint) event->button.x;
 451                 yp = (gint) event->button.y;
 452                 within_tolerance = true;
 453
 454                 Geom::Point const button_pt(event->button.x, event->button.y);
 455                 Geom::Point const p(desktop->w2d(button_pt));
 456                 if (event->button.state & GDK_MOD1_MASK)
 457                     Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_TOUCHPATH);
 458                 Inkscape::Rubberband::get(desktop)->start(desktop, p);
 459                 if (sc->grabbed) {
 460                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 461                     sc->grabbed = NULL;
 462                 }
 463                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 464                                     GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK,
 465                                     NULL, event->button.time);
 466                 sc->grabbed = SP_CANVAS_ITEM(desktop->acetate);
 467
 468                 // remember what modifiers were on before button press
 469                 sc->button_press_shift = (event->button.state & GDK_SHIFT_MASK) ? true : false;
 470                 sc->button_press_ctrl = (event->button.state & GDK_CONTROL_MASK) ? true : false;
 471                 sc->button_press_alt = (event->button.state & GDK_MOD1_MASK) ? true : false;
 472
 473                 sc->moved = FALSE;
 474
 475                 rb_escaped = drag_escaped = 0;
 476
 477                 ret = TRUE;
 478             } else if (event->button.button == 3) {
 479                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 480                 sp_select_context_abort(event_context);
 481             }
 482             break;
 483
 484         case GDK_MOTION_NOTIFY:
 485             if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {
 486                 Geom::Point const motion_pt(event->motion.x, event->motion.y);
 487                 Geom::Point const p(desktop->w2d(motion_pt));
 488
 489                 if ( within_tolerance
 490                      && ( abs( (gint) event->motion.x - xp ) < tolerance )
 491                      && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
 492                     break; // do not drag if we're within tolerance from origin
 493                 }
 494                 // Once the user has moved farther than tolerance from the original location
 495                 // (indicating they intend to move the object, not click), then always process the
 496                 // motion notify coordinates as given (no snapping back to origin)
 497                 within_tolerance = false;
 498
 499                 if (sc->button_press_ctrl || (sc->button_press_alt && !sc->button_press_shift && !selection->isEmpty())) {
 500                     // if it's not click and ctrl or alt was pressed (the latter with some selection
 501                     // but not with shift) we want to drag rather than rubberband
 502                         if (sc->dragging == FALSE) {
 503                                 sp_event_context_snap_window_open(event_context);
 504                         }
 505                         sc->dragging = TRUE;
 506
 507                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 508                 }
 509
 510                 if (sc->dragging) {
 511                     /* User has dragged fast, so we get events on root (lauris)*/
 512                     // not only that; we will end up here when ctrl-dragging as well
 513                     // and also when we started within tolerance, but trespassed tolerance outside of item
 514                     Inkscape::Rubberband::get(desktop)->stop();
 515                     SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 516                     item_at_point = desktop->item_at_point(Geom::Point(event->button.x, event->button.y), FALSE);
 517                     if (!item_at_point) // if no item at this point, try at the click point (bug 1012200)
 518                         item_at_point = desktop->item_at_point(Geom::Point(xp, yp), FALSE);
 519                     if (item_at_point || sc->moved || sc->button_press_alt) {
 520                         // drag only if starting from an item, or if something is already grabbed, or if alt-dragging
 521                         if (!sc->moved) {
 522                             item_in_group = desktop->item_at_point(Geom::Point(event->button.x, event->button.y), TRUE);
 523                             group_at_point = desktop->group_at_point(Geom::Point(event->button.x, event->button.y));
 524                             if (SP_IS_LAYER(selection->single()))
 525                                 group_at_point = SP_GROUP(selection->single());
 526
 527                             // group-at-point is meant to be topmost item if it's a group,
 528                             // not topmost group of all items at point
 529                             if (group_at_point != item_in_group &&
 530                                 !(group_at_point && item_at_point &&
 531                                   group_at_point->isAncestorOf(item_at_point)))
 532                                 group_at_point = NULL;
 533
 534                             // if neither a group nor an item (possibly in a group) at point are selected, set selection to the item at point
 535                             if ((!item_in_group || !selection->includes(item_in_group)) &&
 536                                 (!group_at_point || !selection->includes(group_at_point))
 537                                 && !sc->button_press_alt) {
 538                                 // select what is under cursor
 539                                 if (!seltrans->isEmpty()) {
 540                                     seltrans->resetState();
 541                                 }
 542                                 // when simply ctrl-dragging, we don't want to go into groups
 543                                 if (item_at_point && !selection->includes(item_at_point))
 544                                     selection->set(item_at_point);
 545                             } // otherwise, do not change selection so that dragging selected-within-group items, as well as alt-dragging, is possible
 546                             seltrans->grab(p, -1, -1, FALSE);
 547                             sc->moved = TRUE;
 548                         }
 549                         if (!seltrans->isEmpty())
 550                             seltrans->moveTo(p, event->button.state);
 551                         desktop->scroll_to_point(p);
 552                         gobble_motion_events(GDK_BUTTON1_MASK);
 553                         ret = TRUE;
 554                     } else {
 555                         sc->dragging = FALSE;
 556                         sp_event_context_snap_window_closed(event_context);
 557                         sp_canvas_end_forced_full_redraws(desktop->canvas);
 558                     }
 559                 } else {
 560                     if (Inkscape::Rubberband::get(desktop)->is_started()) {
 561                         Inkscape::Rubberband::get(desktop)->move(p);
 562                         if (Inkscape::Rubberband::get(desktop)->getMode() == RUBBERBAND_MODE_TOUCHPATH) {
 563                             event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Draw over</b> objects to select them; release <b>Alt</b> to switch to rubberband selection"));
 564                         } else {
 565                             event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Drag around</b> objects to select them; press <b>Alt</b> to switch to touch selection"));
 566                         }
 567                         gobble_motion_events(GDK_BUTTON1_MASK);
 568                     }
 569                 }
 570             }
 571             break;
 572         case GDK_BUTTON_RELEASE:
 573             xp = yp = 0;
 574             if ((event->button.button == 1) && (sc->grabbed) && !event_context->space_panning) {
 575                 if (sc->dragging) {
 576                     if (sc->moved) {
 577                         // item has been moved
 578                         seltrans->ungrab();
 579                         sc->moved = FALSE;
 580                     } else if (sc->item && !drag_escaped) {
 581                         // item has not been moved -> simply a click, do selecting
 582                         if (!selection->isEmpty()) {
 583                             if (event->button.state & GDK_SHIFT_MASK) {
 584                                 // with shift, toggle selection
 585                                 seltrans->resetState();
 586                                 selection->toggle(sc->item);
 587                             } else {
 588                                 SPObject* single = selection->single();
 589                                 // without shift, increase state (i.e. toggle scale/rotation handles)
 590                                 if (selection->includes(sc->item)) {
 591                                     seltrans->increaseState();
 592                                 } else if (SP_IS_LAYER(single) && single->isAncestorOf(sc->item)) {
 593                                     seltrans->increaseState();
 594                                 } else {
 595                                     seltrans->resetState();
 596                                     selection->set(sc->item);
 597                                 }
 598                             }
 599                         } else { // simple or shift click, no previous selection
 600                             seltrans->resetState();
 601                             selection->set(sc->item);
 602                         }
 603                     }
 604                     sc->dragging = FALSE;
 605                     sp_event_context_snap_window_closed(event_context);
 606                     sp_canvas_end_forced_full_redraws(desktop->canvas);
 607
 608                     if (sc->item) {
 609                         sp_object_unref( SP_OBJECT(sc->item), NULL);
 610                     }
 611                     sc->item = NULL;
 612                 } else {
 613                     Inkscape::Rubberband::Rubberband *r = Inkscape::Rubberband::get(desktop);
 614                     if (r->is_started() && !within_tolerance) {
 615                         // this was a rubberband drag
 616                         GSList *items = NULL;
 617                         if (r->getMode() == RUBBERBAND_MODE_RECT) {
 618                             Geom::OptRect const b = r->getRectangle();
 619                             items = sp_document_items_in_box(sp_desktop_document(desktop), desktop->dkey, *b);
 620                         } else if (r->getMode() == RUBBERBAND_MODE_TOUCHPATH) {
 621                             items = sp_document_items_at_points(sp_desktop_document(desktop), desktop->dkey, r->getPoints());
 622                         }
 623
 624                         seltrans->resetState();
 625                         r->stop();
 626                         SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 627
 628                         if (event->button.state & GDK_SHIFT_MASK) {
 629                             // with shift, add to selection
 630                             selection->addList (items);
 631                         } else {
 632                             // without shift, simply select anew
 633                             selection->setList (items);
 634                         }
 635                         g_slist_free (items);
 636                     } else { // it was just a click, or a too small rubberband
 637                         r->stop();
 638                         if (sc->button_press_shift && !rb_escaped && !drag_escaped) {
 639                             // this was a shift+click or alt+shift+click, select what was clicked upon
 640
 641                             sc->button_press_shift = false;
 642
 643                             if (sc->button_press_ctrl) {
 644                                 // go into groups, honoring Alt
 645                                 item = sp_event_context_find_item (desktop,
 646                                                    Geom::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, TRUE);
 647                                 sc->button_press_ctrl = FALSE;
 648                             } else {
 649                                 // don't go into groups, honoring Alt
 650                                 item = sp_event_context_find_item (desktop,
 651                                                    Geom::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 652                             }
 653
 654                             if (item) {
 655                                 selection->toggle(item);
 656                                 item = NULL;
 657                             }
 658
 659                         } else if ((sc->button_press_ctrl || sc->button_press_alt) && !rb_escaped && !drag_escaped) { // ctrl+click, alt+click
 660
 661                             item = sp_event_context_find_item (desktop,
 662                                          Geom::Point(event->button.x, event->button.y), sc->button_press_alt, sc->button_press_ctrl);
 663
 664                             sc->button_press_ctrl = FALSE;
 665                             sc->button_press_alt = FALSE;
 666
 667                             if (item) {
 668                                 if (selection->includes(item)) {
 669                                     seltrans->increaseState();
 670                                 } else {
 671                                     seltrans->resetState();
 672                                     selection->set(item);
 673                                 }
 674                                 item = NULL;
 675                             }
 676
 677                         } else { // click without shift, simply deselect, unless with Alt or something was cancelled
 678                             if (!selection->isEmpty()) {
 679                                 if (!(rb_escaped) && !(drag_escaped) && !(event->button.state & GDK_MOD1_MASK))
 680                                     selection->clear();
 681                                 rb_escaped = 0;
 682                                 ret = TRUE;
 683                             }
 684                         }
 685                     }
 686                     ret = TRUE;
 687                 }
 688                 if (sc->grabbed) {
 689                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 690                     sc->grabbed = NULL;
 691                 }
 692
 693                 desktop->updateNow();
 694             }
 695             if (event->button.button == 1) {
 696                 Inkscape::Rubberband::get(desktop)->stop(); // might have been started in another tool!
 697             }
 698             sc->button_press_shift = false;
 699             sc->button_press_ctrl = false;
 700             sc->button_press_alt = false;
 701             break;
 702
 703         case GDK_KEY_PRESS: // keybindings for select context
 704
 705             {
 706             guint keyval = get_group0_keyval(&event->key);
 707             bool alt = ( MOD__ALT
 708                                     || (keyval == GDK_Alt_L)
 709                                     || (keyval == GDK_Alt_R)
 710                                     || (keyval == GDK_Meta_L)
 711                                     || (keyval == GDK_Meta_R));
 712
 713             if (!key_is_a_modifier (keyval)) {
 714                     event_context->defaultMessageContext()->clear();
 715             } else if (sc->grabbed || seltrans->isGrabbed()) {
 716                 if (Inkscape::Rubberband::get(desktop)->is_started()) {
 717                     // if Alt then change cursor to moving cursor:
 718                     if (alt) {
 719                         Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_TOUCHPATH);
 720                     }
 721                 } else {
 722                 // do not change the statusbar text when mousekey is down to move or transform the object,
 723                 // because the statusbar text is already updated somewhere else.
 724                    break;
 725                 }
 726             } else {
 727                     sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
 728                                                 _("<b>Ctrl</b>: click to select in groups; drag to move hor/vert"),
 729                                                 _("<b>Shift</b>: click to toggle select; drag for rubberband selection"),
 730                                                 _("<b>Alt</b>: click to select under; drag to move selected or select by touch"));
 731                     // if Alt and nonempty selection, show moving cursor ("move selected"):
 732                     if (alt && !selection->isEmpty() && !desktop->isWaitingCursor()) {
 733                         GdkCursor *cursor = gdk_cursor_new(GDK_FLEUR);
 734                         gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, cursor);
 735                         gdk_cursor_destroy(cursor);
 736                     }
 737                     //*/
 738                     break;
 739             }
 740             }
 741
 742             switch (get_group0_keyval (&event->key)) {
 743                 case GDK_Left: // move selection left
 744                 case GDK_KP_Left:
 745                 case GDK_KP_4:
 746                     if (!MOD__CTRL) { // not ctrl
 747                         gint mul = 1 + gobble_key_events(
 748                             get_group0_keyval(&event->key), 0); // with any mask
 749                         if (MOD__ALT) { // alt
 750                             if (MOD__SHIFT) sp_selection_move_screen(desktop, mul*-10, 0); // shift
 751                             else sp_selection_move_screen(desktop, mul*-1, 0); // no shift
 752                         }
 753                         else { // no alt
 754                             if (MOD__SHIFT) sp_selection_move(desktop, mul*-10*nudge, 0); // shift
 755                             else sp_selection_move(desktop, mul*-nudge, 0); // no shift
 756                         }
 757                         ret = TRUE;
 758                     }
 759                     break;
 760                 case GDK_Up: // move selection up
 761                 case GDK_KP_Up:
 762                 case GDK_KP_8:
 763                     if (!MOD__CTRL) { // not ctrl
 764                         gint mul = 1 + gobble_key_events(
 765                             get_group0_keyval(&event->key), 0); // with any mask
 766                         if (MOD__ALT) { // alt
 767                             if (MOD__SHIFT) sp_selection_move_screen(desktop, 0, mul*10); // shift
 768                             else sp_selection_move_screen(desktop, 0, mul*1); // no shift
 769                         }
 770                         else { // no alt
 771                             if (MOD__SHIFT) sp_selection_move(desktop, 0, mul*10*nudge); // shift
 772                             else sp_selection_move(desktop, 0, mul*nudge); // no shift
 773                         }
 774                         ret = TRUE;
 775                     }
 776                     break;
 777                 case GDK_Right: // move selection right
 778                 case GDK_KP_Right:
 779                 case GDK_KP_6:
 780                     if (!MOD__CTRL) { // not ctrl
 781                         gint mul = 1 + gobble_key_events(
 782                             get_group0_keyval(&event->key), 0); // with any mask
 783                         if (MOD__ALT) { // alt
 784                             if (MOD__SHIFT) sp_selection_move_screen(desktop, mul*10, 0); // shift
 785                             else sp_selection_move_screen(desktop, mul*1, 0); // no shift
 786                         }
 787                         else { // no alt
 788                             if (MOD__SHIFT) sp_selection_move(desktop, mul*10*nudge, 0); // shift
 789                             else sp_selection_move(desktop, mul*nudge, 0); // no shift
 790                         }
 791                         ret = TRUE;
 792                     }
 793                     break;
 794                 case GDK_Down: // move selection down
 795                 case GDK_KP_Down:
 796                 case GDK_KP_2:
 797                     if (!MOD__CTRL) { // not ctrl
 798                         gint mul = 1 + gobble_key_events(
 799                             get_group0_keyval(&event->key), 0); // with any mask
 800                         if (MOD__ALT) { // alt
 801                             if (MOD__SHIFT) sp_selection_move_screen(desktop, 0, mul*-10); // shift
 802                             else sp_selection_move_screen(desktop, 0, mul*-1); // no shift
 803                         }
 804                         else { // no alt
 805                             if (MOD__SHIFT) sp_selection_move(desktop, 0, mul*-10*nudge); // shift
 806                             else sp_selection_move(desktop, 0, mul*-nudge); // no shift
 807                         }
 808                         ret = TRUE;
 809                     }
 810                     break;
 811                 case GDK_Escape:
 812                     if (!sp_select_context_abort(event_context))
 813                         selection->clear();
 814                     ret = TRUE;
 815                     break;
 816                 case GDK_a:
 817                 case GDK_A:
 818                     if (MOD__CTRL_ONLY) {
 819                         sp_edit_select_all(desktop);
 820                         ret = TRUE;
 821                     }
 822                     break;
 823                 case GDK_space:
 824                     /* stamping mode: show outline mode moving */
 825                     /* FIXME: Is next condition ok? (lauris) */
 826                     if (sc->dragging && sc->grabbed) {
 827                         seltrans->stamp();
 828                         ret = TRUE;
 829                     }
 830                     break;
 831                 case GDK_x:
 832                 case GDK_X:
 833                     if (MOD__ALT_ONLY) {
 834                         desktop->setToolboxFocusTo ("altx");
 835                         ret = TRUE;
 836                     }
 837                     break;
 838                 case GDK_bracketleft:
 839                     if (MOD__ALT) {
 840                         gint mul = 1 + gobble_key_events(
 841                             get_group0_keyval(&event->key), 0); // with any mask
 842                         sp_selection_rotate_screen(selection, mul*1);
 843                     } else if (MOD__CTRL) {
 844                         sp_selection_rotate(selection, 90);
 845                     } else if (snaps) {
 846                         sp_selection_rotate(selection, 180/snaps);
 847                     }
 848                     ret = TRUE;
 849                     break;
 850                 case GDK_bracketright:
 851                     if (MOD__ALT) {
 852                         gint mul = 1 + gobble_key_events(
 853                             get_group0_keyval(&event->key), 0); // with any mask
 854                         sp_selection_rotate_screen(selection, -1*mul);
 855                     } else if (MOD__CTRL) {
 856                         sp_selection_rotate(selection, -90);
 857                     } else if (snaps) {
 858                         sp_selection_rotate(selection, -180/snaps);
 859                     }
 860                     ret = TRUE;
 861                     break;
 862                 case GDK_less:
 863                 case GDK_comma:
 864                     if (MOD__ALT) {
 865                         gint mul = 1 + gobble_key_events(
 866                             get_group0_keyval(&event->key), 0); // with any mask
 867                         sp_selection_scale_screen(selection, -2*mul);
 868                     } else if (MOD__CTRL) {
 869                         sp_selection_scale_times(selection, 0.5);
 870                     } else {
 871                         gint mul = 1 + gobble_key_events(
 872                             get_group0_keyval(&event->key), 0); // with any mask
 873                         sp_selection_scale(selection, -offset*mul);
 874                     }
 875                     ret = TRUE;
 876                     break;
 877                 case GDK_greater:
 878                 case GDK_period:
 879                     if (MOD__ALT) {
 880                         gint mul = 1 + gobble_key_events(
 881                             get_group0_keyval(&event->key), 0); // with any mask
 882                         sp_selection_scale_screen(selection, 2*mul);
 883                     } else if (MOD__CTRL) {
 884                         sp_selection_scale_times(selection, 2);
 885                     } else {
 886                         gint mul = 1 + gobble_key_events(
 887                             get_group0_keyval(&event->key), 0); // with any mask
 888                         sp_selection_scale(selection, offset*mul);
 889                     }
 890                     ret = TRUE;
 891                     break;
 892                 case GDK_Return:
 893                     if (MOD__CTRL_ONLY) {
 894                         if (selection->singleItem()) {
 895                             SPItem *clicked_item = selection->singleItem();
 896                             if ( SP_IS_GROUP(clicked_item) ||
 897                                  SP_IS_BOX3D(clicked_item)) { // enter group or a 3D box
 898                                 desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 899                                 sp_desktop_selection(desktop)->clear();
 900                             } else {
 901                                 SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Selected object is not a group. Cannot enter."));
 902                             }
 903                         }
 904                         ret = TRUE;
 905                     }
 906                     break;
 907                 case GDK_BackSpace:
 908                     if (MOD__CTRL_ONLY) {
 909                         sp_select_context_up_one_layer(desktop);
 910                         ret = TRUE;
 911                     }
 912                     break;
 913                 case GDK_s:
 914                 case GDK_S:
 915                     if (MOD__SHIFT_ONLY) {
 916                         if (!selection->isEmpty()) {
 917                             seltrans->increaseState();
 918                         }
 919                         ret = TRUE;
 920                     }
 921                     break;
 922                 case GDK_g:
 923                 case GDK_G:
 924                     if (MOD__SHIFT_ONLY) {
 925                         sp_selection_to_guides(desktop);
 926                         ret = true;
 927                     }
 928                     break;
 929                 default:
 930                     break;
 931             }
 932             break;
 933
 934         case GDK_KEY_RELEASE:
 935             {
 936             guint keyval = get_group0_keyval(&event->key);
 937             if (key_is_a_modifier (keyval))
 938                 event_context->defaultMessageContext()->clear();
 939
 940             bool alt = ( MOD__ALT
 941                          || (keyval == GDK_Alt_L)
 942                          || (keyval == GDK_Alt_R)
 943                          || (keyval == GDK_Meta_L)
 944                          || (keyval == GDK_Meta_R));
 945
 946             if (Inkscape::Rubberband::get(desktop)->is_started()) {
 947                 // if Alt then change cursor to moving cursor:
 948                 if (alt) {
 949                     Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_RECT);
 950                 }
 951             }
 952             }
 953             // set cursor to default.
 954             if (!desktop->isWaitingCursor())
 955                 gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
 956             break;
 957         default:
 958             break;
 959     }
 960
 961     if (!ret) {
 962         if (((SPEventContextClass *) parent_class)->root_handler)
 963             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 964     }
 965
 966     return ret;
 967 }
 968
 969
 970 /*
 971   Local Variables:
 972   mode:c++
 973   c-file-style:"stroustrup"
 974   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 975   indent-tabs-mode:nil
 976   fill-column:99
 977   End:
 978 */
 979 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :