src/select-context.cpp

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