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     // make sure we still have valid objects to move around
 414     if (sc->item && SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))==NULL) {
 415         sp_select_context_abort(event_context);
 416     }
 417
 418     switch (event->type) {
 419         case GDK_2BUTTON_PRESS:
 420             if (event->button.button == 1) {
 421                 if (!selection->isEmpty()) {
 422                     SPItem *clicked_item = (SPItem *) selection->itemList()->data;
 423                     if (SP_IS_GROUP(clicked_item) && !SP_IS_BOX3D(clicked_item)) { // enter group if it's not a 3D box
 424                         desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 425                         sp_desktop_selection(desktop)->clear();
 426                         sc->dragging = false;
 427                         sp_event_context_snap_window_closed(event_context);
 428
 429                         sp_canvas_end_forced_full_redraws(desktop->canvas);
 430                     } else { // switch tool
 431                         Geom::Point const button_pt(event->button.x, event->button.y);
 432                         Geom::Point const p(desktop->w2d(button_pt));
 433                         tools_switch_by_item (desktop, clicked_item, p);
 434                     }
 435                 } else {
 436                     sp_select_context_up_one_layer(desktop);
 437                 }
 438                 ret = TRUE;
 439             }
 440             break;
 441         case GDK_BUTTON_PRESS:
 442             if (event->button.button == 1 && !event_context->space_panning) {
 443
 444                 // save drag origin
 445                 xp = (gint) event->button.x;
 446                 yp = (gint) event->button.y;
 447                 within_tolerance = true;
 448
 449                 Geom::Point const button_pt(event->button.x, event->button.y);
 450                 Geom::Point const p(desktop->w2d(button_pt));
 451                 if (event->button.state & GDK_MOD1_MASK)
 452                     Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_TOUCHPATH);
 453                 Inkscape::Rubberband::get(desktop)->start(desktop, p);
 454                 if (sc->grabbed) {
 455                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 456                     sc->grabbed = NULL;
 457                 }
 458                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 459                                     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,
 460                                     NULL, event->button.time);
 461                 sc->grabbed = SP_CANVAS_ITEM(desktop->acetate);
 462
 463                 // remember what modifiers were on before button press
 464                 sc->button_press_shift = (event->button.state & GDK_SHIFT_MASK) ? true : false;
 465                 sc->button_press_ctrl = (event->button.state & GDK_CONTROL_MASK) ? true : false;
 466                 sc->button_press_alt = (event->button.state & GDK_MOD1_MASK) ? true : false;
 467
 468                 sc->moved = FALSE;
 469
 470                 rb_escaped = drag_escaped = 0;
 471
 472                 ret = TRUE;
 473             } else if (event->button.button == 3) {
 474                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 475                 sp_select_context_abort(event_context);
 476             }
 477             break;
 478
 479         case GDK_MOTION_NOTIFY:
 480                 tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 481                 if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {
 482                 Geom::Point const motion_pt(event->motion.x, event->motion.y);
 483                 Geom::Point const p(desktop->w2d(motion_pt));
 484
 485                 if ( within_tolerance
 486                      && ( abs( (gint) event->motion.x - xp ) < tolerance )
 487                      && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
 488                     break; // do not drag if we're within tolerance from origin
 489                 }
 490                 // Once the user has moved farther than tolerance from the original location
 491                 // (indicating they intend to move the object, not click), then always process the
 492                 // motion notify coordinates as given (no snapping back to origin)
 493                 within_tolerance = false;
 494
 495                 if (sc->button_press_ctrl || (sc->button_press_alt && !sc->button_press_shift && !selection->isEmpty())) {
 496                     // if it's not click and ctrl or alt was pressed (the latter with some selection
 497                     // but not with shift) we want to drag rather than rubberband
 498                         if (sc->dragging == FALSE) {
 499                                 sp_event_context_snap_window_open(event_context);
 500                         }
 501                         sc->dragging = TRUE;
 502
 503                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 504                 }
 505
 506                 if (sc->dragging) {
 507                     /* User has dragged fast, so we get events on root (lauris)*/
 508                     // not only that; we will end up here when ctrl-dragging as well
 509                     // and also when we started within tolerance, but trespassed tolerance outside of item
 510                     Inkscape::Rubberband::get(desktop)->stop();
 511                     SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 512                     item_at_point = desktop->item_at_point(Geom::Point(event->button.x, event->button.y), FALSE);
 513                     if (!item_at_point) // if no item at this point, try at the click point (bug 1012200)
 514                         item_at_point = desktop->item_at_point(Geom::Point(xp, yp), FALSE);
 515                     if (item_at_point || sc->moved || sc->button_press_alt) {
 516                         // drag only if starting from an item, or if something is already grabbed, or if alt-dragging
 517                         if (!sc->moved) {
 518                             item_in_group = desktop->item_at_point(Geom::Point(event->button.x, event->button.y), TRUE);
 519                             group_at_point = desktop->group_at_point(Geom::Point(event->button.x, event->button.y));
 520                             if (SP_IS_LAYER(selection->single()))
 521                                 group_at_point = SP_GROUP(selection->single());
 522
 523                             // group-at-point is meant to be topmost item if it's a group,
 524                             // not topmost group of all items at point
 525                             if (group_at_point != item_in_group &&
 526                                 !(group_at_point && item_at_point &&
 527                                   group_at_point->isAncestorOf(item_at_point)))
 528                                 group_at_point = NULL;
 529
 530                             // if neither a group nor an item (possibly in a group) at point are selected, set selection to the item at point
 531                             if ((!item_in_group || !selection->includes(item_in_group)) &&
 532                                 (!group_at_point || !selection->includes(group_at_point))
 533                                 && !sc->button_press_alt) {
 534                                 // select what is under cursor
 535                                 if (!seltrans->isEmpty()) {
 536                                     seltrans->resetState();
 537                                 }
 538                                 // when simply ctrl-dragging, we don't want to go into groups
 539                                 if (item_at_point && !selection->includes(item_at_point))
 540                                     selection->set(item_at_point);
 541                             } // otherwise, do not change selection so that dragging selected-within-group items, as well as alt-dragging, is possible
 542                             seltrans->grab(p, -1, -1, FALSE);
 543                             sc->moved = TRUE;
 544                         }
 545                         if (!seltrans->isEmpty())
 546                             seltrans->moveTo(p, event->button.state);
 547                         desktop->scroll_to_point(p);
 548                         gobble_motion_events(GDK_BUTTON1_MASK);
 549                         ret = TRUE;
 550                     } else {
 551                         sc->dragging = FALSE;
 552                         sp_event_context_snap_window_closed(event_context);
 553                         sp_canvas_end_forced_full_redraws(desktop->canvas);
 554                     }
 555                 } else {
 556                     if (Inkscape::Rubberband::get(desktop)->is_started()) {
 557                         Inkscape::Rubberband::get(desktop)->move(p);
 558                         if (Inkscape::Rubberband::get(desktop)->getMode() == RUBBERBAND_MODE_TOUCHPATH) {
 559                             event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Draw over</b> objects to select them; release <b>Alt</b> to switch to rubberband selection"));
 560                         } else {
 561                             event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Drag around</b> objects to select them; press <b>Alt</b> to switch to touch selection"));
 562                         }
 563                         gobble_motion_events(GDK_BUTTON1_MASK);
 564                     }
 565                 }
 566             }
 567             break;
 568         case GDK_BUTTON_RELEASE:
 569             xp = yp = 0;
 570             if ((event->button.button == 1) && (sc->grabbed) && !event_context->space_panning) {
 571                 if (sc->dragging) {
 572                     if (sc->moved) {
 573                         // item has been moved
 574                         seltrans->ungrab();
 575                         sc->moved = FALSE;
 576                     } else if (sc->item && !drag_escaped) {
 577                         // item has not been moved -> simply a click, do selecting
 578                         if (!selection->isEmpty()) {
 579                             if (event->button.state & GDK_SHIFT_MASK) {
 580                                 // with shift, toggle selection
 581                                 seltrans->resetState();
 582                                 selection->toggle(sc->item);
 583                             } else {
 584                                 SPObject* single = selection->single();
 585                                 // without shift, increase state (i.e. toggle scale/rotation handles)
 586                                 if (selection->includes(sc->item)) {
 587                                     seltrans->increaseState();
 588                                 } else if (SP_IS_LAYER(single) && single->isAncestorOf(sc->item)) {
 589                                     seltrans->increaseState();
 590                                 } else {
 591                                     seltrans->resetState();
 592                                     selection->set(sc->item);
 593                                 }
 594                             }
 595                         } else { // simple or shift click, no previous selection
 596                             seltrans->resetState();
 597                             selection->set(sc->item);
 598                         }
 599                     }
 600                     sc->dragging = FALSE;
 601                     sp_event_context_snap_window_closed(event_context);
 602                     sp_canvas_end_forced_full_redraws(desktop->canvas);
 603
 604                     if (sc->item) {
 605                         sp_object_unref( SP_OBJECT(sc->item), NULL);
 606                     }
 607                     sc->item = NULL;
 608                 } else {
 609                     Inkscape::Rubberband::Rubberband *r = Inkscape::Rubberband::get(desktop);
 610                     if (r->is_started() && !within_tolerance) {
 611                         // this was a rubberband drag
 612                         GSList *items = NULL;
 613                         if (r->getMode() == RUBBERBAND_MODE_RECT) {
 614                             Geom::OptRect const b = r->getRectangle();
 615                             items = sp_document_items_in_box(sp_desktop_document(desktop), desktop->dkey, *b);
 616                         } else if (r->getMode() == RUBBERBAND_MODE_TOUCHPATH) {
 617                             items = sp_document_items_at_points(sp_desktop_document(desktop), desktop->dkey, r->getPoints());
 618                         }
 619
 620                         seltrans->resetState();
 621                         r->stop();
 622                         SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 623
 624                         if (event->button.state & GDK_SHIFT_MASK) {
 625                             // with shift, add to selection
 626                             selection->addList (items);
 627                         } else {
 628                             // without shift, simply select anew
 629                             selection->setList (items);
 630                         }
 631                         g_slist_free (items);
 632                     } else { // it was just a click, or a too small rubberband
 633                         r->stop();
 634                         if (sc->button_press_shift && !rb_escaped && !drag_escaped) {
 635                             // this was a shift+click or alt+shift+click, select what was clicked upon
 636
 637                             sc->button_press_shift = false;
 638
 639                             if (sc->button_press_ctrl) {
 640                                 // go into groups, honoring Alt
 641                                 item = sp_event_context_find_item (desktop,
 642                                                    Geom::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, TRUE);
 643                                 sc->button_press_ctrl = FALSE;
 644                             } else {
 645                                 // don't go into groups, honoring Alt
 646                                 item = sp_event_context_find_item (desktop,
 647                                                    Geom::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 648                             }
 649
 650                             if (item) {
 651                                 selection->toggle(item);
 652                                 item = NULL;
 653                             }
 654
 655                         } else if ((sc->button_press_ctrl || sc->button_press_alt) && !rb_escaped && !drag_escaped) { // ctrl+click, alt+click
 656
 657                             item = sp_event_context_find_item (desktop,
 658                                          Geom::Point(event->button.x, event->button.y), sc->button_press_alt, sc->button_press_ctrl);
 659
 660                             sc->button_press_ctrl = FALSE;
 661                             sc->button_press_alt = FALSE;
 662
 663                             if (item) {
 664                                 if (selection->includes(item)) {
 665                                     seltrans->increaseState();
 666                                 } else {
 667                                     seltrans->resetState();
 668                                     selection->set(item);
 669                                 }
 670                                 item = NULL;
 671                             }
 672
 673                         } else { // click without shift, simply deselect, unless with Alt or something was cancelled
 674                             if (!selection->isEmpty()) {
 675                                 if (!(rb_escaped) && !(drag_escaped) && !(event->button.state & GDK_MOD1_MASK))
 676                                     selection->clear();
 677                                 rb_escaped = 0;
 678                                 ret = TRUE;
 679                             }
 680                         }
 681                     }
 682                     ret = TRUE;
 683                 }
 684                 if (sc->grabbed) {
 685                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 686                     sc->grabbed = NULL;
 687                 }
 688
 689                 desktop->updateNow();
 690             }
 691             if (event->button.button == 1) {
 692                 Inkscape::Rubberband::get(desktop)->stop(); // might have been started in another tool!
 693             }
 694             sc->button_press_shift = false;
 695             sc->button_press_ctrl = false;
 696             sc->button_press_alt = false;
 697             break;
 698
 699         case GDK_KEY_PRESS: // keybindings for select context
 700
 701                         {
 702                         {
 703                 guint keyval = get_group0_keyval(&event->key);
 704             bool alt = ( MOD__ALT
 705                                     || (keyval == GDK_Alt_L)
 706                                     || (keyval == GDK_Alt_R)
 707                                     || (keyval == GDK_Meta_L)
 708                                     || (keyval == GDK_Meta_R));
 709
 710             if (!key_is_a_modifier (keyval)) {
 711                     event_context->defaultMessageContext()->clear();
 712             } else if (sc->grabbed || seltrans->isGrabbed()) {
 713                 if (Inkscape::Rubberband::get(desktop)->is_started()) {
 714                     // if Alt then change cursor to moving cursor:
 715                     if (alt) {
 716                         Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_TOUCHPATH);
 717                     }
 718                 } else {
 719                 // do not change the statusbar text when mousekey is down to move or transform the object,
 720                 // because the statusbar text is already updated somewhere else.
 721                    break;
 722                 }
 723             } else {
 724                     sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
 725                                                 _("<b>Ctrl</b>: click to select in groups; drag to move hor/vert"),
 726                                                 _("<b>Shift</b>: click to toggle select; drag for rubberband selection"),
 727                                                 _("<b>Alt</b>: click to select under; drag to move selected or select by touch"));
 728                     // if Alt and nonempty selection, show moving cursor ("move selected"):
 729                     if (alt && !selection->isEmpty() && !desktop->isWaitingCursor()) {
 730                         GdkCursor *cursor = gdk_cursor_new(GDK_FLEUR);
 731                         gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, cursor);
 732                         gdk_cursor_destroy(cursor);
 733                     }
 734                     //*/
 735                     break;
 736             }
 737                         }
 738
 739             gdouble const nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000); // in px
 740                         gdouble const offset = prefs->getDoubleLimited("/options/defaultscale/value", 2, 0, 1000);
 741                         int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
 742
 743                         switch (get_group0_keyval (&event->key)) {
 744                 case GDK_Left: // move selection left
 745                 case GDK_KP_Left:
 746                 case GDK_KP_4:
 747                     if (!MOD__CTRL) { // not ctrl
 748                         gint mul = 1 + gobble_key_events(
 749                             get_group0_keyval(&event->key), 0); // with any mask
 750                         if (MOD__ALT) { // alt
 751                             if (MOD__SHIFT) sp_selection_move_screen(desktop, mul*-10, 0); // shift
 752                             else sp_selection_move_screen(desktop, mul*-1, 0); // no shift
 753                         }
 754                         else { // no alt
 755                             if (MOD__SHIFT) sp_selection_move(desktop, mul*-10*nudge, 0); // shift
 756                             else sp_selection_move(desktop, mul*-nudge, 0); // no shift
 757                         }
 758                         ret = TRUE;
 759                     }
 760                     break;
 761                 case GDK_Up: // move selection up
 762                 case GDK_KP_Up:
 763                 case GDK_KP_8:
 764                     if (!MOD__CTRL) { // not ctrl
 765                         gint mul = 1 + gobble_key_events(
 766                             get_group0_keyval(&event->key), 0); // with any mask
 767                         if (MOD__ALT) { // alt
 768                             if (MOD__SHIFT) sp_selection_move_screen(desktop, 0, mul*10); // shift
 769                             else sp_selection_move_screen(desktop, 0, mul*1); // no shift
 770                         }
 771                         else { // no alt
 772                             if (MOD__SHIFT) sp_selection_move(desktop, 0, mul*10*nudge); // shift
 773                             else sp_selection_move(desktop, 0, mul*nudge); // no shift
 774                         }
 775                         ret = TRUE;
 776                     }
 777                     break;
 778                 case GDK_Right: // move selection right
 779                 case GDK_KP_Right:
 780                 case GDK_KP_6:
 781                     if (!MOD__CTRL) { // not ctrl
 782                         gint mul = 1 + gobble_key_events(
 783                             get_group0_keyval(&event->key), 0); // with any mask
 784                         if (MOD__ALT) { // alt
 785                             if (MOD__SHIFT) sp_selection_move_screen(desktop, mul*10, 0); // shift
 786                             else sp_selection_move_screen(desktop, mul*1, 0); // no shift
 787                         }
 788                         else { // no alt
 789                             if (MOD__SHIFT) sp_selection_move(desktop, mul*10*nudge, 0); // shift
 790                             else sp_selection_move(desktop, mul*nudge, 0); // no shift
 791                         }
 792                         ret = TRUE;
 793                     }
 794                     break;
 795                 case GDK_Down: // move selection down
 796                 case GDK_KP_Down:
 797                 case GDK_KP_2:
 798                     if (!MOD__CTRL) { // not ctrl
 799                         gint mul = 1 + gobble_key_events(
 800                             get_group0_keyval(&event->key), 0); // with any mask
 801                         if (MOD__ALT) { // alt
 802                             if (MOD__SHIFT) sp_selection_move_screen(desktop, 0, mul*-10); // shift
 803                             else sp_selection_move_screen(desktop, 0, mul*-1); // no shift
 804                         }
 805                         else { // no alt
 806                             if (MOD__SHIFT) sp_selection_move(desktop, 0, mul*-10*nudge); // shift
 807                             else sp_selection_move(desktop, 0, mul*-nudge); // no shift
 808                         }
 809                         ret = TRUE;
 810                     }
 811                     break;
 812                 case GDK_Escape:
 813                     if (!sp_select_context_abort(event_context))
 814                         selection->clear();
 815                     ret = TRUE;
 816                     break;
 817                 case GDK_a:
 818                 case GDK_A:
 819                     if (MOD__CTRL_ONLY) {
 820                         sp_edit_select_all(desktop);
 821                         ret = TRUE;
 822                     }
 823                     break;
 824                 case GDK_space:
 825                     /* stamping mode: show outline mode moving */
 826                     /* FIXME: Is next condition ok? (lauris) */
 827                     if (sc->dragging && sc->grabbed) {
 828                         seltrans->stamp();
 829                         ret = TRUE;
 830                     }
 831                     break;
 832                 case GDK_x:
 833                 case GDK_X:
 834                     if (MOD__ALT_ONLY) {
 835                         desktop->setToolboxFocusTo ("altx");
 836                         ret = TRUE;
 837                     }
 838                     break;
 839                 case GDK_bracketleft:
 840                     if (MOD__ALT) {
 841                         gint mul = 1 + gobble_key_events(
 842                             get_group0_keyval(&event->key), 0); // with any mask
 843                         sp_selection_rotate_screen(selection, mul*1);
 844                     } else if (MOD__CTRL) {
 845                         sp_selection_rotate(selection, 90);
 846                     } else if (snaps) {
 847                         sp_selection_rotate(selection, 180/snaps);
 848                     }
 849                     ret = TRUE;
 850                     break;
 851                 case GDK_bracketright:
 852                     if (MOD__ALT) {
 853                         gint mul = 1 + gobble_key_events(
 854                             get_group0_keyval(&event->key), 0); // with any mask
 855                         sp_selection_rotate_screen(selection, -1*mul);
 856                     } else if (MOD__CTRL) {
 857                         sp_selection_rotate(selection, -90);
 858                     } else if (snaps) {
 859                         sp_selection_rotate(selection, -180/snaps);
 860                     }
 861                     ret = TRUE;
 862                     break;
 863                 case GDK_less:
 864                 case GDK_comma:
 865                     if (MOD__ALT) {
 866                         gint mul = 1 + gobble_key_events(
 867                             get_group0_keyval(&event->key), 0); // with any mask
 868                         sp_selection_scale_screen(selection, -2*mul);
 869                     } else if (MOD__CTRL) {
 870                         sp_selection_scale_times(selection, 0.5);
 871                     } else {
 872                         gint mul = 1 + gobble_key_events(
 873                             get_group0_keyval(&event->key), 0); // with any mask
 874                         sp_selection_scale(selection, -offset*mul);
 875                     }
 876                     ret = TRUE;
 877                     break;
 878                 case GDK_greater:
 879                 case GDK_period:
 880                     if (MOD__ALT) {
 881                         gint mul = 1 + gobble_key_events(
 882                             get_group0_keyval(&event->key), 0); // with any mask
 883                         sp_selection_scale_screen(selection, 2*mul);
 884                     } else if (MOD__CTRL) {
 885                         sp_selection_scale_times(selection, 2);
 886                     } else {
 887                         gint mul = 1 + gobble_key_events(
 888                             get_group0_keyval(&event->key), 0); // with any mask
 889                         sp_selection_scale(selection, offset*mul);
 890                     }
 891                     ret = TRUE;
 892                     break;
 893                 case GDK_Return:
 894                     if (MOD__CTRL_ONLY) {
 895                         if (selection->singleItem()) {
 896                             SPItem *clicked_item = selection->singleItem();
 897                             if ( SP_IS_GROUP(clicked_item) ||
 898                                  SP_IS_BOX3D(clicked_item)) { // enter group or a 3D box
 899                                 desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 900                                 sp_desktop_selection(desktop)->clear();
 901                             } else {
 902                                 SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Selected object is not a group. Cannot enter."));
 903                             }
 904                         }
 905                         ret = TRUE;
 906                     }
 907                     break;
 908                 case GDK_BackSpace:
 909                     if (MOD__CTRL_ONLY) {
 910                         sp_select_context_up_one_layer(desktop);
 911                         ret = TRUE;
 912                     }
 913                     break;
 914                 case GDK_s:
 915                 case GDK_S:
 916                     if (MOD__SHIFT_ONLY) {
 917                         if (!selection->isEmpty()) {
 918                             seltrans->increaseState();
 919                         }
 920                         ret = TRUE;
 921                     }
 922                     break;
 923                 case GDK_g:
 924                 case GDK_G:
 925                     if (MOD__SHIFT_ONLY) {
 926                         sp_selection_to_guides(desktop);
 927                         ret = true;
 928                     }
 929                     break;
 930                 default:
 931                     break;
 932             }
 933             break;
 934                         }
 935         case GDK_KEY_RELEASE:
 936             {
 937             guint keyval = get_group0_keyval(&event->key);
 938             if (key_is_a_modifier (keyval))
 939                 event_context->defaultMessageContext()->clear();
 940
 941             bool alt = ( MOD__ALT
 942                          || (keyval == GDK_Alt_L)
 943                          || (keyval == GDK_Alt_R)
 944                          || (keyval == GDK_Meta_L)
 945                          || (keyval == GDK_Meta_R));
 946
 947             if (Inkscape::Rubberband::get(desktop)->is_started()) {
 948                 // if Alt then change cursor to moving cursor:
 949                 if (alt) {
 950                     Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_RECT);
 951                 }
 952             }
 953             }
 954             // set cursor to default.
 955             if (!desktop->isWaitingCursor())
 956                 gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
 957             break;
 958         default:
 959             break;
 960     }
 961
 962     if (!ret) {
 963         if (((SPEventContextClass *) parent_class)->root_handler)
 964             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 965     }
 966
 967     return ret;
 968 }
 969
 970
 971 /*
 972   Local Variables:
 973   mode:c++
 974   c-file-style:"stroustrup"
 975   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 976   indent-tabs-mode:nil
 977   fill-column:99
 978   End:
 979 */
 980 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :