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             drag_escaped = 1;
 216
 217             if (sc->item) {
 218                 // only undo if the item is still valid
 219                 if (SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))) {
 220                     sp_document_undo(sp_desktop_document(desktop));
 221                 }
 222
 223                 sp_object_unref( SP_OBJECT(sc->item), NULL);
 224             } else if (sc->button_press_ctrl) {
 225                 // NOTE:  This is a workaround to a bug.
 226                 // When the ctrl key is held, sc->item is not defined
 227                 // so in this case (only), we skip the object doc check
 228                 sp_document_undo(sp_desktop_document(desktop));
 229             }
 230             sc->item = NULL;
 231
 232             SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Move canceled."));
 233             return true;
 234         }
 235     } else {
 236         if (Inkscape::Rubberband::get(desktop)->is_started()) {
 237             Inkscape::Rubberband::get(desktop)->stop();
 238             rb_escaped = 1;
 239             SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 240             SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Selection canceled."));
 241             return true;
 242         }
 243     }
 244     return false;
 245 }
 246
 247 bool
 248 key_is_a_modifier (guint key) {
 249     return (key == GDK_Alt_L ||
 250                 key == GDK_Alt_R ||
 251                 key == GDK_Control_L ||
 252                 key == GDK_Control_R ||
 253                 key == GDK_Shift_L ||
 254                 key == GDK_Shift_R ||
 255                 key == GDK_Meta_L ||  // Meta is when you press Shift+Alt (at least on my machine)
 256             key == GDK_Meta_R);
 257 }
 258
 259 void
 260 sp_select_context_up_one_layer(SPDesktop *desktop)
 261 {
 262     /* Click in empty place, go up one level -- but don't leave a layer to root.
 263      *
 264      * (Rationale: we don't usually allow users to go to the root, since that
 265      * detracts from the layer metaphor: objects at the root level can in front
 266      * of or behind layers.  Whereas it's fine to go to the root if editing
 267      * a document that has no layers (e.g. a non-Inkscape document).)
 268      *
 269      * Once we support editing SVG "islands" (e.g. <svg> embedded in an xhtml
 270      * document), we might consider further restricting the below to disallow
 271      * leaving a layer to go to a non-layer.
 272      */
 273     SPObject *const current_layer = desktop->currentLayer();
 274     if (current_layer) {
 275         SPObject *const parent = SP_OBJECT_PARENT(current_layer);
 276         if ( parent
 277              && ( SP_OBJECT_PARENT(parent)
 278                   || !( SP_IS_GROUP(current_layer)
 279                         && ( SPGroup::LAYER
 280                              == SP_GROUP(current_layer)->layerMode() ) ) ) )
 281         {
 282             desktop->setCurrentLayer(parent);
 283             if (SP_IS_GROUP(current_layer) && SPGroup::LAYER != SP_GROUP(current_layer)->layerMode())
 284                 sp_desktop_selection(desktop)->set(current_layer);
 285         }
 286     }
 287 }
 288
 289 static gint
 290 sp_select_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 291 {
 292     gint ret = FALSE;
 293
 294     SPDesktop *desktop = event_context->desktop;
 295     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 296     Inkscape::SelTrans *seltrans = sc->_seltrans;
 297
 298     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 299     tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 300
 301     // make sure we still have valid objects to move around
 302     if (sc->item && SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))==NULL) {
 303         sp_select_context_abort(event_context);
 304     }
 305
 306     switch (event->type) {
 307         case GDK_BUTTON_PRESS:
 308             if (event->button.button == 1 && !event_context->space_panning) {
 309                 /* Left mousebutton */
 310
 311                 // save drag origin
 312                 xp = (gint) event->button.x;
 313                 yp = (gint) event->button.y;
 314                 within_tolerance = true;
 315
 316                 // remember what modifiers were on before button press
 317                 sc->button_press_shift = (event->button.state & GDK_SHIFT_MASK) ? true : false;
 318                 sc->button_press_ctrl = (event->button.state & GDK_CONTROL_MASK) ? true : false;
 319                 sc->button_press_alt = (event->button.state & GDK_MOD1_MASK) ? true : false;
 320
 321                 if (event->button.state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK | GDK_MOD1_MASK)) {
 322                     // if shift or ctrl was pressed, do not move objects;
 323                     // pass the event to root handler which will perform rubberband, shift-click, ctrl-click, ctrl-drag
 324                 } else {
 325                     sc->dragging = TRUE;
 326                     sc->moved = FALSE;
 327
 328                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 329
 330                     // remember the clicked item in sc->item:
 331                     if (sc->item) {
 332                         sp_object_unref(sc->item, NULL);
 333                         sc->item = NULL;
 334                     }
 335                     sc->item = sp_event_context_find_item (desktop,
 336                                               Geom::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 337                     sp_object_ref(sc->item, NULL);
 338
 339                     rb_escaped = drag_escaped = 0;
 340
 341                     if (sc->grabbed) {
 342                         sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 343                         sc->grabbed = NULL;
 344                     }
 345                     sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->drawing),
 346                                         GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_PRESS_MASK |
 347                                         GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK,
 348                                         NULL, event->button.time);
 349                     sc->grabbed = SP_CANVAS_ITEM(desktop->drawing);
 350
 351                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 352
 353                     ret = TRUE;
 354                 }
 355             } else if (event->button.button == 3) {
 356                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 357                 sp_select_context_abort(event_context);
 358             }
 359             break;
 360
 361         case GDK_ENTER_NOTIFY:
 362         {
 363             GdkCursor *cursor = gdk_cursor_new(GDK_FLEUR);
 364             gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, cursor);
 365             gdk_cursor_destroy(cursor);
 366             break;
 367         }
 368
 369         case GDK_LEAVE_NOTIFY:
 370             gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
 371             break;
 372
 373         case GDK_KEY_PRESS:
 374             if (get_group0_keyval (&event->key) == GDK_space) {
 375                 if (sc->dragging && sc->grabbed) {
 376                     /* stamping mode: show content mode moving */
 377                     seltrans->stamp();
 378                     ret = TRUE;
 379                 }
 380             }
 381             break;
 382
 383         default:
 384             break;
 385     }
 386
 387     if (!ret) {
 388         if (((SPEventContextClass *) parent_class)->item_handler)
 389             ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 390     }
 391
 392     return ret;
 393 }
 394
 395 static gint
 396 sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 397 {
 398     SPItem *item = NULL;
 399     SPItem *item_at_point = NULL, *group_at_point = NULL, *item_in_group = NULL;
 400     gint ret = FALSE;
 401
 402     SPDesktop *desktop = event_context->desktop;
 403     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 404     Inkscape::SelTrans *seltrans = sc->_seltrans;
 405     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 406     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 407
 408     gdouble const nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000); // in px
 409     gdouble const offset = prefs->getDoubleLimited("/options/defaultscale/value", 2, 0, 1000);
 410     tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 411     int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
 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
 428                         sp_canvas_end_forced_full_redraws(desktop->canvas);
 429                     } else { // switch tool
 430                         tools_switch_by_item (desktop, clicked_item);
 431                     }
 432                 } else {
 433                     sp_select_context_up_one_layer(desktop);
 434                 }
 435                 ret = TRUE;
 436             }
 437             break;
 438         case GDK_BUTTON_PRESS:
 439             if (event->button.button == 1 && !event_context->space_panning) {
 440
 441                 // save drag origin
 442                 xp = (gint) event->button.x;
 443                 yp = (gint) event->button.y;
 444                 within_tolerance = true;
 445
 446                 Geom::Point const button_pt(event->button.x, event->button.y);
 447                 Geom::Point const p(desktop->w2d(button_pt));
 448                 if (event->button.state & GDK_MOD1_MASK)
 449                     Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_TOUCHPATH);
 450                 Inkscape::Rubberband::get(desktop)->start(desktop, p);
 451                 if (sc->grabbed) {
 452                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 453                     sc->grabbed = NULL;
 454                 }
 455                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 456                                     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,
 457                                     NULL, event->button.time);
 458                 sc->grabbed = SP_CANVAS_ITEM(desktop->acetate);
 459
 460                 // remember what modifiers were on before button press
 461                 sc->button_press_shift = (event->button.state & GDK_SHIFT_MASK) ? true : false;
 462                 sc->button_press_ctrl = (event->button.state & GDK_CONTROL_MASK) ? true : false;
 463                 sc->button_press_alt = (event->button.state & GDK_MOD1_MASK) ? true : false;
 464
 465                 sc->moved = FALSE;
 466
 467                 rb_escaped = drag_escaped = 0;
 468
 469                 ret = TRUE;
 470             } else if (event->button.button == 3) {
 471                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 472                 sp_select_context_abort(event_context);
 473             }
 474             break;
 475
 476         case GDK_MOTION_NOTIFY:
 477             if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {
 478                 Geom::Point const motion_pt(event->motion.x, event->motion.y);
 479                 Geom::Point const p(desktop->w2d(motion_pt));
 480
 481                 if ( within_tolerance
 482                      && ( abs( (gint) event->motion.x - xp ) < tolerance )
 483                      && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
 484                     break; // do not drag if we're within tolerance from origin
 485                 }
 486                 // Once the user has moved farther than tolerance from the original location
 487                 // (indicating they intend to move the object, not click), then always process the
 488                 // motion notify coordinates as given (no snapping back to origin)
 489                 within_tolerance = false;
 490
 491                 if (sc->button_press_ctrl || (sc->button_press_alt && !sc->button_press_shift && !selection->isEmpty())) {
 492                     // if it's not click and ctrl or alt was pressed (the latter with some selection
 493                     // but not with shift) we want to drag rather than rubberband
 494                     sc->dragging = TRUE;
 495
 496                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 497                 }
 498
 499                 if (sc->dragging) {
 500                     /* User has dragged fast, so we get events on root (lauris)*/
 501                     // not only that; we will end up here when ctrl-dragging as well
 502                     // and also when we started within tolerance, but trespassed tolerance outside of item
 503                     Inkscape::Rubberband::get(desktop)->stop();
 504                     SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 505                     item_at_point = desktop->item_at_point(Geom::Point(event->button.x, event->button.y), FALSE);
 506                     if (!item_at_point) // if no item at this point, try at the click point (bug 1012200)
 507                         item_at_point = desktop->item_at_point(Geom::Point(xp, yp), FALSE);
 508                     if (item_at_point || sc->moved || sc->button_press_alt) {
 509                         // drag only if starting from an item, or if something is already grabbed, or if alt-dragging
 510                         if (!sc->moved) {
 511                             item_in_group = desktop->item_at_point(Geom::Point(event->button.x, event->button.y), TRUE);
 512                             group_at_point = desktop->group_at_point(Geom::Point(event->button.x, event->button.y));
 513
 514                             // group-at-point is meant to be topmost item if it's a group,
 515                             // not topmost group of all items at point
 516                             if (group_at_point != item_in_group &&
 517                                 !(group_at_point && item_at_point &&
 518                                   group_at_point->isAncestorOf(item_at_point)))
 519                                 group_at_point = NULL;
 520
 521                             // if neither a group nor an item (possibly in a group) at point are selected, set selection to the item at point
 522                             if ((!item_in_group || !selection->includes(item_in_group)) &&
 523                                 (!group_at_point || !selection->includes(group_at_point))
 524                                 && !sc->button_press_alt) {
 525                                 // select what is under cursor
 526                                 if (!seltrans->isEmpty()) {
 527                                     seltrans->resetState();
 528                                 }
 529                                 // when simply ctrl-dragging, we don't want to go into groups
 530                                 if (item_at_point && !selection->includes(item_at_point))
 531                                     selection->set(item_at_point);
 532                             } // otherwise, do not change selection so that dragging selected-within-group items, as well as alt-dragging, is possible
 533                             seltrans->grab(p, -1, -1, FALSE);
 534                             sc->moved = TRUE;
 535                         }
 536                         if (!seltrans->isEmpty())
 537                             seltrans->moveTo(p, event->button.state);
 538                         desktop->scroll_to_point(p);
 539                         gobble_motion_events(GDK_BUTTON1_MASK);
 540                         ret = TRUE;
 541                     } else {
 542                         sc->dragging = FALSE;
 543
 544                         sp_canvas_end_forced_full_redraws(desktop->canvas);
 545                     }
 546                 } else {
 547                     if (Inkscape::Rubberband::get(desktop)->is_started()) {
 548                         Inkscape::Rubberband::get(desktop)->move(p);
 549                         if (Inkscape::Rubberband::get(desktop)->getMode() == RUBBERBAND_MODE_TOUCHPATH) {
 550                             event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Draw over</b> objects to select them; release <b>Alt</b> to switch to rubberband selection"));
 551                         } else {
 552                             event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Drag around</b> objects to select them; press <b>Alt</b> to switch to touch selection"));
 553                         }
 554                         gobble_motion_events(GDK_BUTTON1_MASK);
 555                     }
 556                 }
 557             }
 558             break;
 559         case GDK_BUTTON_RELEASE:
 560             xp = yp = 0;
 561             if ((event->button.button == 1) && (sc->grabbed) && !event_context->space_panning) {
 562                 if (sc->dragging) {
 563                     if (sc->moved) {
 564                         // item has been moved
 565                         seltrans->ungrab();
 566                         sc->moved = FALSE;
 567                     } else if (sc->item && !drag_escaped) {
 568                         // item has not been moved -> simply a click, do selecting
 569                         if (!selection->isEmpty()) {
 570                             if (event->button.state & GDK_SHIFT_MASK) {
 571                                 // with shift, toggle selection
 572                                 seltrans->resetState();
 573                                 selection->toggle(sc->item);
 574                             } else {
 575                                 // without shift, increase state (i.e. toggle scale/rotation handles)
 576                                 if (selection->includes(sc->item)) {
 577                                     seltrans->increaseState();
 578                                 } else {
 579                                     seltrans->resetState();
 580                                     selection->set(sc->item);
 581                                 }
 582                             }
 583                         } else { // simple or shift click, no previous selection
 584                             seltrans->resetState();
 585                             selection->set(sc->item);
 586                         }
 587                     }
 588                     sc->dragging = FALSE;
 589
 590                     sp_canvas_end_forced_full_redraws(desktop->canvas);
 591
 592                     if (sc->item) {
 593                         sp_object_unref( SP_OBJECT(sc->item), NULL);
 594                     }
 595                     sc->item = NULL;
 596                 } else {
 597                     Inkscape::Rubberband::Rubberband *r = Inkscape::Rubberband::get(desktop);
 598                     if (r->is_started() && !within_tolerance) {
 599                         // this was a rubberband drag
 600                         GSList *items = NULL;
 601                         if (r->getMode() == RUBBERBAND_MODE_RECT) {
 602                             Geom::OptRect const b = r->getRectangle();
 603                             items = sp_document_items_in_box(sp_desktop_document(desktop), desktop->dkey, *b);
 604                         } else if (r->getMode() == RUBBERBAND_MODE_TOUCHPATH) {
 605                             items = sp_document_items_at_points(sp_desktop_document(desktop), desktop->dkey, r->getPoints());
 606                         }
 607
 608                         seltrans->resetState();
 609                         r->stop();
 610                         SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 611
 612                         if (event->button.state & GDK_SHIFT_MASK) {
 613                             // with shift, add to selection
 614                             selection->addList (items);
 615                         } else {
 616                             // without shift, simply select anew
 617                             selection->setList (items);
 618                         }
 619                         g_slist_free (items);
 620                     } else { // it was just a click, or a too small rubberband
 621                         r->stop();
 622                         if (sc->button_press_shift && !rb_escaped && !drag_escaped) {
 623                             // this was a shift+click or alt+shift+click, select what was clicked upon
 624
 625                             sc->button_press_shift = false;
 626
 627                             if (sc->button_press_ctrl) {
 628                                 // go into groups, honoring Alt
 629                                 item = sp_event_context_find_item (desktop,
 630                                                    Geom::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, TRUE);
 631                                 sc->button_press_ctrl = FALSE;
 632                             } else {
 633                                 // don't go into groups, honoring Alt
 634                                 item = sp_event_context_find_item (desktop,
 635                                                    Geom::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 636                             }
 637
 638                             if (item) {
 639                                 selection->toggle(item);
 640                                 item = NULL;
 641                             }
 642
 643                         } else if ((sc->button_press_ctrl || sc->button_press_alt) && !rb_escaped && !drag_escaped) { // ctrl+click, alt+click
 644
 645                             item = sp_event_context_find_item (desktop,
 646                                          Geom::Point(event->button.x, event->button.y), sc->button_press_alt, sc->button_press_ctrl);
 647
 648                             sc->button_press_ctrl = FALSE;
 649                             sc->button_press_alt = FALSE;
 650
 651                             if (item) {
 652                                 if (selection->includes(item)) {
 653                                     seltrans->increaseState();
 654                                 } else {
 655                                     seltrans->resetState();
 656                                     selection->set(item);
 657                                 }
 658                                 item = NULL;
 659                             }
 660
 661                         } else { // click without shift, simply deselect, unless with Alt or something was cancelled
 662                             if (!selection->isEmpty()) {
 663                                 if (!(rb_escaped) && !(drag_escaped) && !(event->button.state & GDK_MOD1_MASK))
 664                                     selection->clear();
 665                                 rb_escaped = 0;
 666                                 ret = TRUE;
 667                             }
 668                         }
 669                     }
 670                     ret = TRUE;
 671                 }
 672                 if (sc->grabbed) {
 673                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 674                     sc->grabbed = NULL;
 675                 }
 676
 677                 desktop->updateNow();
 678             }
 679             if (event->button.button == 1) {
 680                 Inkscape::Rubberband::get(desktop)->stop(); // might have been started in another tool!
 681             }
 682             sc->button_press_shift = false;
 683             sc->button_press_ctrl = false;
 684             sc->button_press_alt = false;
 685             break;
 686
 687         case GDK_KEY_PRESS: // keybindings for select context
 688
 689             {
 690             guint keyval = get_group0_keyval(&event->key);
 691             bool alt = ( MOD__ALT
 692                                     || (keyval == GDK_Alt_L)
 693                                     || (keyval == GDK_Alt_R)
 694                                     || (keyval == GDK_Meta_L)
 695                                     || (keyval == GDK_Meta_R));
 696
 697             if (!key_is_a_modifier (keyval)) {
 698                     event_context->defaultMessageContext()->clear();
 699             } else if (sc->grabbed || seltrans->isGrabbed()) {
 700                 if (Inkscape::Rubberband::get(desktop)->is_started()) {
 701                     // if Alt then change cursor to moving cursor:
 702                     if (alt) {
 703                         Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_TOUCHPATH);
 704                     }
 705                 } else {
 706                 // do not change the statusbar text when mousekey is down to move or transform the object,
 707                 // because the statusbar text is already updated somewhere else.
 708                    break;
 709                 }
 710             } else {
 711                     sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
 712                                                 _("<b>Ctrl</b>: click to select in groups; drag to move hor/vert"),
 713                                                 _("<b>Shift</b>: click to toggle select; drag for rubberband selection"),
 714                                                 _("<b>Alt</b>: click to select under; drag to move selected or select by touch"));
 715                     // if Alt and nonempty selection, show moving cursor ("move selected"):
 716                     if (alt && !selection->isEmpty()) {
 717                         GdkCursor *cursor = gdk_cursor_new(GDK_FLEUR);
 718                         gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, cursor);
 719                         gdk_cursor_destroy(cursor);
 720                     }
 721                     //*/
 722                     break;
 723             }
 724             }
 725
 726             switch (get_group0_keyval (&event->key)) {
 727                 case GDK_Left: // move selection left
 728                 case GDK_KP_Left:
 729                 case GDK_KP_4:
 730                     if (!MOD__CTRL) { // not ctrl
 731                         gint mul = 1 + gobble_key_events(
 732                             get_group0_keyval(&event->key), 0); // with any mask
 733                         if (MOD__ALT) { // alt
 734                             if (MOD__SHIFT) sp_selection_move_screen(desktop, mul*-10, 0); // shift
 735                             else sp_selection_move_screen(desktop, mul*-1, 0); // no shift
 736                         }
 737                         else { // no alt
 738                             if (MOD__SHIFT) sp_selection_move(desktop, mul*-10*nudge, 0); // shift
 739                             else sp_selection_move(desktop, mul*-nudge, 0); // no shift
 740                         }
 741                         ret = TRUE;
 742                     }
 743                     break;
 744                 case GDK_Up: // move selection up
 745                 case GDK_KP_Up:
 746                 case GDK_KP_8:
 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, 0, mul*10); // shift
 752                             else sp_selection_move_screen(desktop, 0, mul*1); // no shift
 753                         }
 754                         else { // no alt
 755                             if (MOD__SHIFT) sp_selection_move(desktop, 0, mul*10*nudge); // shift
 756                             else sp_selection_move(desktop, 0, mul*nudge); // no shift
 757                         }
 758                         ret = TRUE;
 759                     }
 760                     break;
 761                 case GDK_Right: // move selection right
 762                 case GDK_KP_Right:
 763                 case GDK_KP_6:
 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, mul*10, 0); // shift
 769                             else sp_selection_move_screen(desktop, mul*1, 0); // no shift
 770                         }
 771                         else { // no alt
 772                             if (MOD__SHIFT) sp_selection_move(desktop, mul*10*nudge, 0); // shift
 773                             else sp_selection_move(desktop, mul*nudge, 0); // no shift
 774                         }
 775                         ret = TRUE;
 776                     }
 777                     break;
 778                 case GDK_Down: // move selection down
 779                 case GDK_KP_Down:
 780                 case GDK_KP_2:
 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, 0, mul*-10); // shift
 786                             else sp_selection_move_screen(desktop, 0, mul*-1); // no shift
 787                         }
 788                         else { // no alt
 789                             if (MOD__SHIFT) sp_selection_move(desktop, 0, mul*-10*nudge); // shift
 790                             else sp_selection_move(desktop, 0, mul*-nudge); // no shift
 791                         }
 792                         ret = TRUE;
 793                     }
 794                     break;
 795                 case GDK_Escape:
 796                     if (!sp_select_context_abort(event_context))
 797                         selection->clear();
 798                     ret = TRUE;
 799                     break;
 800                 case GDK_a:
 801                 case GDK_A:
 802                     if (MOD__CTRL_ONLY) {
 803                         sp_edit_select_all(desktop);
 804                         ret = TRUE;
 805                     }
 806                     break;
 807                 case GDK_space:
 808                     /* stamping mode: show outline mode moving */
 809                     /* FIXME: Is next condition ok? (lauris) */
 810                     if (sc->dragging && sc->grabbed) {
 811                         seltrans->stamp();
 812                         ret = TRUE;
 813                     }
 814                     break;
 815                 case GDK_x:
 816                 case GDK_X:
 817                     if (MOD__ALT_ONLY) {
 818                         desktop->setToolboxFocusTo ("altx");
 819                         ret = TRUE;
 820                     }
 821                     break;
 822                 case GDK_bracketleft:
 823                     if (MOD__ALT) {
 824                         gint mul = 1 + gobble_key_events(
 825                             get_group0_keyval(&event->key), 0); // with any mask
 826                         sp_selection_rotate_screen(selection, mul*1);
 827                     } else if (MOD__CTRL) {
 828                         sp_selection_rotate(selection, 90);
 829                     } else if (snaps) {
 830                         sp_selection_rotate(selection, 180/snaps);
 831                     }
 832                     ret = TRUE;
 833                     break;
 834                 case GDK_bracketright:
 835                     if (MOD__ALT) {
 836                         gint mul = 1 + gobble_key_events(
 837                             get_group0_keyval(&event->key), 0); // with any mask
 838                         sp_selection_rotate_screen(selection, -1*mul);
 839                     } else if (MOD__CTRL) {
 840                         sp_selection_rotate(selection, -90);
 841                     } else if (snaps) {
 842                         sp_selection_rotate(selection, -180/snaps);
 843                     }
 844                     ret = TRUE;
 845                     break;
 846                 case GDK_less:
 847                 case GDK_comma:
 848                     if (MOD__ALT) {
 849                         gint mul = 1 + gobble_key_events(
 850                             get_group0_keyval(&event->key), 0); // with any mask
 851                         sp_selection_scale_screen(selection, -2*mul);
 852                     } else if (MOD__CTRL) {
 853                         sp_selection_scale_times(selection, 0.5);
 854                     } else {
 855                         gint mul = 1 + gobble_key_events(
 856                             get_group0_keyval(&event->key), 0); // with any mask
 857                         sp_selection_scale(selection, -offset*mul);
 858                     }
 859                     ret = TRUE;
 860                     break;
 861                 case GDK_greater:
 862                 case GDK_period:
 863                     if (MOD__ALT) {
 864                         gint mul = 1 + gobble_key_events(
 865                             get_group0_keyval(&event->key), 0); // with any mask
 866                         sp_selection_scale_screen(selection, 2*mul);
 867                     } else if (MOD__CTRL) {
 868                         sp_selection_scale_times(selection, 2);
 869                     } else {
 870                         gint mul = 1 + gobble_key_events(
 871                             get_group0_keyval(&event->key), 0); // with any mask
 872                         sp_selection_scale(selection, offset*mul);
 873                     }
 874                     ret = TRUE;
 875                     break;
 876                 case GDK_Return:
 877                     if (MOD__CTRL_ONLY) {
 878                         if (selection->singleItem()) {
 879                             SPItem *clicked_item = selection->singleItem();
 880                             if ( SP_IS_GROUP(clicked_item) ||
 881                                  SP_IS_BOX3D(clicked_item)) { // enter group or a 3D box
 882                                 desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 883                                 sp_desktop_selection(desktop)->clear();
 884                             } else {
 885                                 SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Selected object is not a group. Cannot enter."));
 886                             }
 887                         }
 888                         ret = TRUE;
 889                     }
 890                     break;
 891                 case GDK_BackSpace:
 892                     if (MOD__CTRL_ONLY) {
 893                         sp_select_context_up_one_layer(desktop);
 894                         ret = TRUE;
 895                     }
 896                     break;
 897                 case GDK_s:
 898                 case GDK_S:
 899                     if (MOD__SHIFT_ONLY) {
 900                         if (!selection->isEmpty()) {
 901                             seltrans->increaseState();
 902                         }
 903                         ret = TRUE;
 904                     }
 905                     break;
 906                 case GDK_g:
 907                 case GDK_G:
 908                     if (MOD__SHIFT_ONLY) {
 909                         sp_selection_to_guides(desktop);
 910                         ret = true;
 911                     }
 912                     break;
 913                 default:
 914                     break;
 915             }
 916             break;
 917
 918         case GDK_KEY_RELEASE:
 919             {
 920             guint keyval = get_group0_keyval(&event->key);
 921             if (key_is_a_modifier (keyval))
 922                 event_context->defaultMessageContext()->clear();
 923
 924             bool alt = ( MOD__ALT
 925                          || (keyval == GDK_Alt_L)
 926                          || (keyval == GDK_Alt_R)
 927                          || (keyval == GDK_Meta_L)
 928                          || (keyval == GDK_Meta_R));
 929
 930             if (Inkscape::Rubberband::get(desktop)->is_started()) {
 931                 // if Alt then change cursor to moving cursor:
 932                 if (alt) {
 933                     Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_RECT);
 934                 }
 935             }
 936             }
 937             // set cursor to default.
 938             gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
 939             break;
 940         default:
 941             break;
 942     }
 943
 944     if (!ret) {
 945         if (((SPEventContextClass *) parent_class)->root_handler)
 946             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 947     }
 948
 949     return ret;
 950 }
 951
 952
 953 /*
 954   Local Variables:
 955   mode:c++
 956   c-file-style:"stroustrup"
 957   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 958   indent-tabs-mode:nil
 959   fill-column:99
 960   End:
 961 */
 962 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :