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         if (Inkscape::Rubberband::get()->is_started()) {
 232             Inkscape::Rubberband::get()->stop();
 233             rb_escaped = 1;
 234             SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 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 && !event_context->space_panning) {
 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 | GDK_MOD1_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                     if (sc->item) {
 326                         sp_object_unref(sc->item, NULL);
 327                         sc->item = NULL;
 328                     }
 329                     sc->item = sp_event_context_find_item (desktop,
 330                                               NR::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 331                     sp_object_ref(sc->item, NULL);
 332
 333                     rb_escaped = drag_escaped = 0;
 334
 335                     if (sc->grabbed) {
 336                         sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 337                         sc->grabbed = NULL;
 338                     }
 339                     sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->drawing),
 340                                         GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_PRESS_MASK |
 341                                         GDK_POINTER_MOTION_MASK,
 342                                         NULL, event->button.time);
 343                     sc->grabbed = SP_CANVAS_ITEM(desktop->drawing);
 344
 345                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 346
 347                     ret = TRUE;
 348                 }
 349             } else if (event->button.button == 3) {
 350                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 351                 sp_select_context_abort(event_context);
 352             }
 353             break;
 354
 355         case GDK_ENTER_NOTIFY:
 356         {
 357             GdkCursor *cursor = gdk_cursor_new(GDK_FLEUR);
 358             gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, cursor);
 359             gdk_cursor_destroy(cursor);
 360             break;
 361         }
 362
 363         case GDK_LEAVE_NOTIFY:
 364             gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
 365             break;
 366
 367         case GDK_KEY_PRESS:
 368             if (get_group0_keyval (&event->key) == GDK_space) {
 369                 if (sc->dragging && sc->grabbed) {
 370                     /* stamping mode: show content mode moving */
 371                     seltrans->stamp();
 372                     ret = TRUE;
 373                 }
 374             }
 375             break;
 376
 377         default:
 378             break;
 379     }
 380
 381     if (!ret) {
 382         if (((SPEventContextClass *) parent_class)->item_handler)
 383             ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 384     }
 385
 386     return ret;
 387 }
 388
 389 static gint
 390 sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 391 {
 392     SPItem *item = NULL;
 393     SPItem *item_at_point = NULL, *group_at_point = NULL, *item_in_group = NULL;
 394     gint ret = FALSE;
 395
 396     SPDesktop *desktop = event_context->desktop;
 397     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 398     Inkscape::SelTrans *seltrans = sc->_seltrans;
 399     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 400     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 401     gdouble const offset = prefs_get_double_attribute_limited("options.defaultscale", "value", 2, 0, 1000);
 402     tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 403     int const snaps = prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12);
 404
 405     // make sure we still have valid objects to move around
 406     if (sc->item && SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))==NULL) {
 407         sp_select_context_abort(event_context);
 408     }
 409
 410     switch (event->type) {
 411         case GDK_2BUTTON_PRESS:
 412             if (event->button.button == 1) {
 413                 if (!selection->isEmpty()) {
 414                     SPItem *clicked_item = (SPItem *) selection->itemList()->data;
 415                     if (SP_IS_GROUP (clicked_item)) { // enter group
 416                         desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 417                         sp_desktop_selection(desktop)->clear();
 418                         sc->dragging = false;
 419
 420                         sp_canvas_end_forced_full_redraws(desktop->canvas);
 421                     } else { // switch tool
 422                         tools_switch_by_item (desktop, clicked_item);
 423                     }
 424                 } else {
 425                     sp_select_context_up_one_layer(desktop);
 426                 }
 427                 ret = TRUE;
 428             }
 429             break;
 430         case GDK_BUTTON_PRESS:
 431             if (event->button.button == 1 && !event_context->space_panning) {
 432
 433                 // save drag origin
 434                 xp = (gint) event->button.x;
 435                 yp = (gint) event->button.y;
 436                 within_tolerance = true;
 437
 438                 NR::Point const button_pt(event->button.x, event->button.y);
 439                 NR::Point const p(desktop->w2d(button_pt));
 440                 if (event->button.state & GDK_MOD1_MASK)
 441                     Inkscape::Rubberband::get()->setMode(RUBBERBAND_MODE_TOUCHPATH);
 442                 Inkscape::Rubberband::get()->start(desktop, p);
 443                 if (sc->grabbed) {
 444                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 445                     sc->grabbed = NULL;
 446                 }
 447                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 448                                     GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK,
 449                                     NULL, event->button.time);
 450                 sc->grabbed = SP_CANVAS_ITEM(desktop->acetate);
 451
 452                 // remember what modifiers were on before button press
 453                 sc->button_press_shift = (event->button.state & GDK_SHIFT_MASK) ? true : false;
 454                 sc->button_press_ctrl = (event->button.state & GDK_CONTROL_MASK) ? true : false;
 455                 sc->button_press_alt = (event->button.state & GDK_MOD1_MASK) ? true : false;
 456
 457                 sc->moved = FALSE;
 458
 459                 rb_escaped = drag_escaped = 0;
 460
 461                 ret = TRUE;
 462             } else if (event->button.button == 3) {
 463                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 464                 sp_select_context_abort(event_context);
 465             }
 466             break;
 467
 468         case GDK_MOTION_NOTIFY:
 469             if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {
 470                 NR::Point const motion_pt(event->motion.x, event->motion.y);
 471                 NR::Point const p(desktop->w2d(motion_pt));
 472
 473                 if ( within_tolerance
 474                      && ( abs( (gint) event->motion.x - xp ) < tolerance )
 475                      && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
 476                     break; // do not drag if we're within tolerance from origin
 477                 }
 478                 // Once the user has moved farther than tolerance from the original location
 479                 // (indicating they intend to move the object, not click), then always process the
 480                 // motion notify coordinates as given (no snapping back to origin)
 481                 within_tolerance = false;
 482
 483                 if (sc->button_press_ctrl || (sc->button_press_alt && !sc->button_press_shift && !selection->isEmpty())) {
 484                     // if it's not click and ctrl or alt was pressed (the latter with some selection
 485                     // but not with shift) we want to drag rather than rubberband
 486                     sc->dragging = TRUE;
 487
 488                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 489                 }
 490
 491                 if (sc->dragging) {
 492                     /* User has dragged fast, so we get events on root (lauris)*/
 493                     // not only that; we will end up here when ctrl-dragging as well
 494                     // and also when we started within tolerance, but trespassed tolerance outside of item
 495                     Inkscape::Rubberband::get()->stop();
 496                     SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 497                     item_at_point = desktop->item_at_point(NR::Point(event->button.x, event->button.y), FALSE);
 498                     if (!item_at_point) // if no item at this point, try at the click point (bug 1012200)
 499                         item_at_point = desktop->item_at_point(NR::Point(xp, yp), FALSE);
 500                     if (item_at_point || sc->moved || sc->button_press_alt) {
 501                         // drag only if starting from an item, or if something is already grabbed, or if alt-dragging
 502                         if (!sc->moved) {
 503                             item_in_group = desktop->item_at_point(NR::Point(event->button.x, event->button.y), TRUE);
 504                             group_at_point = desktop->group_at_point(NR::Point(event->button.x, event->button.y));
 505                             // if neither a group nor an item (possibly in a group) at point are selected, set selection to the item at point
 506                             if ((!item_in_group || !selection->includes(item_in_group)) &&
 507                                 (!group_at_point || !selection->includes(group_at_point))
 508                                 && !sc->button_press_alt) {
 509                                 // select what is under cursor
 510                                 if (!seltrans->isEmpty()) {
 511                                     seltrans->resetState();
 512                                 }
 513                                 // when simply ctrl-dragging, we don't want to go into groups
 514                                 if (item_at_point && !selection->includes(item_at_point))
 515                                     selection->set(item_at_point);
 516                             } // otherwise, do not change selection so that dragging selected-within-group items, as well as alt-dragging, is possible
 517                             seltrans->grab(p, -1, -1, FALSE);
 518                             sc->moved = TRUE;
 519                         }
 520                         if (!seltrans->isEmpty())
 521                             seltrans->moveTo(p, event->button.state);
 522                         desktop->scroll_to_point(&p);
 523                         gobble_motion_events(GDK_BUTTON1_MASK);
 524                         ret = TRUE;
 525                     } else {
 526                         sc->dragging = FALSE;
 527
 528                         sp_canvas_end_forced_full_redraws(desktop->canvas);
 529                     }
 530                 } else {
 531                     if (Inkscape::Rubberband::get()->is_started()) {
 532                         Inkscape::Rubberband::get()->move(p);
 533                         if (Inkscape::Rubberband::get()->getMode() == RUBBERBAND_MODE_TOUCHPATH) {
 534                             event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Draw over</b> objects to select them; release <b>Alt</b> to switch to rubberband selection"));
 535                         } else {
 536                             event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Drag around</b> objects to select them; press <b>Alt</b> to switch to touch selection"));
 537                         }
 538                         gobble_motion_events(GDK_BUTTON1_MASK);
 539                     }
 540                 }
 541             }
 542             break;
 543         case GDK_BUTTON_RELEASE:
 544             xp = yp = 0;
 545             if ((event->button.button == 1) && (sc->grabbed) && !event_context->space_panning) {
 546                 if (sc->dragging) {
 547                     if (sc->moved) {
 548                         // item has been moved
 549                         seltrans->ungrab();
 550                         sc->moved = FALSE;
 551                     } else if (sc->item && !drag_escaped) {
 552                         // item has not been moved -> simply a click, do selecting
 553                         if (!selection->isEmpty()) {
 554                             if (event->button.state & GDK_SHIFT_MASK) {
 555                                 // with shift, toggle selection
 556                                 seltrans->resetState();
 557                                 selection->toggle(sc->item);
 558                             } else {
 559                                 // without shift, increase state (i.e. toggle scale/rotation handles)
 560                                 if (selection->includes(sc->item)) {
 561                                     seltrans->increaseState();
 562                                 } else {
 563                                     seltrans->resetState();
 564                                     selection->set(sc->item);
 565                                 }
 566                             }
 567                         } else { // simple or shift click, no previous selection
 568                             seltrans->resetState();
 569                             selection->set(sc->item);
 570                         }
 571                     }
 572                     sc->dragging = FALSE;
 573
 574                     sp_canvas_end_forced_full_redraws(desktop->canvas);
 575
 576                     if (sc->item) {
 577                         sp_object_unref( SP_OBJECT(sc->item), NULL);
 578                     }
 579                     sc->item = NULL;
 580                 } else {
 581                     Inkscape::Rubberband::Rubberband *r = Inkscape::Rubberband::get();
 582                     if (r->is_started() && !within_tolerance) {
 583                         // this was a rubberband drag
 584                         GSList *items = NULL;
 585                         if (r->getMode() == RUBBERBAND_MODE_RECT) {
 586                             NR::Maybe<NR::Rect> const b = r->getRectangle();
 587                             items = sp_document_items_in_box(sp_desktop_document(desktop), desktop->dkey, *b);
 588                         } else if (r->getMode() == RUBBERBAND_MODE_TOUCHPATH) {
 589                             items = sp_document_items_at_points(sp_desktop_document(desktop), desktop->dkey, r->getPoints());
 590                         }
 591
 592                         seltrans->resetState();
 593                         r->stop();
 594                         SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 595
 596                         if (event->button.state & GDK_SHIFT_MASK) {
 597                             // with shift, add to selection
 598                             selection->addList (items);
 599                         } else {
 600                             // without shift, simply select anew
 601                             selection->setList (items);
 602                         }
 603                         g_slist_free (items);
 604                     } else { // it was just a click, or a too small rubberband
 605                         r->stop();
 606                         if (sc->button_press_shift && !rb_escaped && !drag_escaped) {
 607                             // this was a shift+click or alt+shift+click, select what was clicked upon
 608
 609                             sc->button_press_shift = false;
 610
 611                             if (sc->button_press_ctrl) {
 612                                 // go into groups, honoring Alt
 613                                 item = sp_event_context_find_item (desktop,
 614                                                    NR::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, TRUE);
 615                                 sc->button_press_ctrl = FALSE;
 616                             } else {
 617                                 // don't go into groups, honoring Alt
 618                                 item = sp_event_context_find_item (desktop,
 619                                                    NR::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 620                             }
 621
 622                             if (item) {
 623                                 selection->toggle(item);
 624                                 item = NULL;
 625                             }
 626
 627                         } else if ((sc->button_press_ctrl || sc->button_press_alt) && !rb_escaped && !drag_escaped) { // ctrl+click, alt+click
 628
 629                             item = sp_event_context_find_item (desktop,
 630                                          NR::Point(event->button.x, event->button.y), sc->button_press_alt, sc->button_press_ctrl);
 631
 632                             sc->button_press_ctrl = FALSE;
 633                             sc->button_press_alt = FALSE;
 634
 635                             if (item) {
 636                                 if (selection->includes(item)) {
 637                                     seltrans->increaseState();
 638                                 } else {
 639                                     seltrans->resetState();
 640                                     selection->set(item);
 641                                 }
 642                                 item = NULL;
 643                             }
 644
 645                         } else { // click without shift, simply deselect, unless with Alt or something was cancelled
 646                             if (!selection->isEmpty()) {
 647                                 if (!(rb_escaped) && !(drag_escaped) && !(event->button.state & GDK_MOD1_MASK))
 648                                     selection->clear();
 649                                 rb_escaped = 0;
 650                                 ret = TRUE;
 651                             }
 652                         }
 653                     }
 654                     ret = TRUE;
 655                 }
 656                 if (sc->grabbed) {
 657                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 658                     sc->grabbed = NULL;
 659                 }
 660
 661                 desktop->updateNow();
 662             }
 663             if (event->button.button == 1) {
 664                 Inkscape::Rubberband::get()->stop(); // might have been started in another tool!
 665             }
 666             sc->button_press_shift = false;
 667             sc->button_press_ctrl = false;
 668             sc->button_press_alt = false;
 669             break;
 670
 671         case GDK_KEY_PRESS: // keybindings for select context
 672
 673             {
 674             guint keyval = get_group0_keyval(&event->key);
 675             bool alt = ( MOD__ALT
 676                                     || (keyval == GDK_Alt_L)
 677                                     || (keyval == GDK_Alt_R)
 678                                     || (keyval == GDK_Meta_L)
 679                                     || (keyval == GDK_Meta_R));
 680
 681             if (!key_is_a_modifier (keyval)) {
 682                     event_context->defaultMessageContext()->clear();
 683             } else if (sc->grabbed || seltrans->isGrabbed()) {
 684                 if (Inkscape::Rubberband::get()->is_started()) {
 685                     // if Alt then change cursor to moving cursor:
 686                     if (alt) {
 687                         Inkscape::Rubberband::get()->setMode(RUBBERBAND_MODE_TOUCHPATH);
 688                     }
 689                 } else {
 690                 // do not change the statusbar text when mousekey is down to move or transform the object,
 691                 // because the statusbar text is already updated somewhere else.
 692                    break;
 693                 }
 694             } else {
 695                     sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
 696                                                 _("<b>Ctrl</b>: click to select in groups; drag to move hor/vert"),
 697                                                 _("<b>Shift</b>: click to toggle select; drag for rubberband selection"),
 698                                                 _("<b>Alt</b>: click to select under; drag to move selected or select by touch"));
 699                     // if Alt and nonempty selection, show moving cursor ("move selected"):
 700                     if (alt && !selection->isEmpty()) {
 701                         GdkCursor *cursor = gdk_cursor_new(GDK_FLEUR);
 702                         gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, cursor);
 703                         gdk_cursor_destroy(cursor);
 704                     }
 705                     //*/
 706                     break;
 707             }
 708             }
 709
 710             switch (get_group0_keyval (&event->key)) {
 711                 case GDK_Left: // move selection left
 712                 case GDK_KP_Left:
 713                 case GDK_KP_4:
 714                     if (!MOD__CTRL) { // not ctrl
 715                         if (MOD__ALT) { // alt
 716                             if (MOD__SHIFT) sp_selection_move_screen(-10, 0); // shift
 717                             else sp_selection_move_screen(-1, 0); // no shift
 718                         }
 719                         else { // no alt
 720                             if (MOD__SHIFT) sp_selection_move(-10*nudge, 0); // shift
 721                             else sp_selection_move(-nudge, 0); // no shift
 722                         }
 723                         ret = TRUE;
 724                     }
 725                     break;
 726                 case GDK_Up: // move selection up
 727                 case GDK_KP_Up:
 728                 case GDK_KP_8:
 729                     if (!MOD__CTRL) { // not ctrl
 730                         if (MOD__ALT) { // alt
 731                             if (MOD__SHIFT) sp_selection_move_screen(0, 10); // shift
 732                             else sp_selection_move_screen(0, 1); // no shift
 733                         }
 734                         else { // no alt
 735                             if (MOD__SHIFT) sp_selection_move(0, 10*nudge); // shift
 736                             else sp_selection_move(0, nudge); // no shift
 737                         }
 738                         ret = TRUE;
 739                     }
 740                     break;
 741                 case GDK_Right: // move selection right
 742                 case GDK_KP_Right:
 743                 case GDK_KP_6:
 744                     if (!MOD__CTRL) { // not ctrl
 745                         if (MOD__ALT) { // alt
 746                             if (MOD__SHIFT) sp_selection_move_screen(10, 0); // shift
 747                             else sp_selection_move_screen(1, 0); // no shift
 748                         }
 749                         else { // no alt
 750                             if (MOD__SHIFT) sp_selection_move(10*nudge, 0); // shift
 751                             else sp_selection_move(nudge, 0); // no shift
 752                         }
 753                         ret = TRUE;
 754                     }
 755                     break;
 756                 case GDK_Down: // move selection down
 757                 case GDK_KP_Down:
 758                 case GDK_KP_2:
 759                     if (!MOD__CTRL) { // not ctrl
 760                         if (MOD__ALT) { // alt
 761                             if (MOD__SHIFT) sp_selection_move_screen(0, -10); // shift
 762                             else sp_selection_move_screen(0, -1); // no shift
 763                         }
 764                         else { // no alt
 765                             if (MOD__SHIFT) sp_selection_move(0, -10*nudge); // shift
 766                             else sp_selection_move(0, -nudge); // no shift
 767                         }
 768                         ret = TRUE;
 769                     }
 770                     break;
 771                 case GDK_Escape:
 772                     if (!sp_select_context_abort(event_context))
 773                         selection->clear();
 774                     ret = TRUE;
 775                     break;
 776                 case GDK_a:
 777                 case GDK_A:
 778                     if (MOD__CTRL_ONLY) {
 779                         sp_edit_select_all();
 780                         ret = TRUE;
 781                     }
 782                     break;
 783                 case GDK_space:
 784                     /* stamping mode: show outline mode moving */
 785                     /* FIXME: Is next condition ok? (lauris) */
 786                     if (sc->dragging && sc->grabbed) {
 787                         seltrans->stamp();
 788                         ret = TRUE;
 789                     }
 790                     break;
 791                 case GDK_x:
 792                 case GDK_X:
 793                     if (MOD__ALT_ONLY) {
 794                         desktop->setToolboxFocusTo ("altx");
 795                         ret = TRUE;
 796                     }
 797                     break;
 798                 case GDK_bracketleft:
 799                     if (MOD__ALT) {
 800                         sp_selection_rotate_screen(selection, 1);
 801                     } else if (MOD__CTRL) {
 802                         sp_selection_rotate(selection, 90);
 803                     } else if (snaps) {
 804                         sp_selection_rotate(selection, 180/snaps);
 805                     }
 806                     ret = TRUE;
 807                     break;
 808                 case GDK_bracketright:
 809                     if (MOD__ALT) {
 810                         sp_selection_rotate_screen(selection, -1);
 811                     } else if (MOD__CTRL) {
 812                         sp_selection_rotate(selection, -90);
 813                     } else if (snaps) {
 814                         sp_selection_rotate(selection, -180/snaps);
 815                     }
 816                     ret = TRUE;
 817                     break;
 818                 case GDK_less:
 819                 case GDK_comma:
 820                     if (MOD__ALT) {
 821                         sp_selection_scale_screen(selection, -2);
 822                     } else if (MOD__CTRL) {
 823                         sp_selection_scale_times(selection, 0.5);
 824                     } else {
 825                         sp_selection_scale(selection, -offset);
 826                     }
 827                     ret = TRUE;
 828                     break;
 829                 case GDK_greater:
 830                 case GDK_period:
 831                     if (MOD__ALT) {
 832                         sp_selection_scale_screen(selection, 2);
 833                     } else if (MOD__CTRL) {
 834                         sp_selection_scale_times(selection, 2);
 835                     } else {
 836                         sp_selection_scale(selection, offset);
 837                     }
 838                     ret = TRUE;
 839                     break;
 840                 case GDK_Return:
 841                     if (MOD__CTRL_ONLY) {
 842                         if (selection->singleItem()) {
 843                             SPItem *clicked_item = selection->singleItem();
 844                             if (SP_IS_GROUP (clicked_item)) { // enter group
 845                                 desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 846                                 sp_desktop_selection(desktop)->clear();
 847                             } else {
 848                                 SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Selected object is not a group. Cannot enter."));
 849                             }
 850                         }
 851                         ret = TRUE;
 852                     }
 853                     break;
 854                 case GDK_BackSpace:
 855                     if (MOD__CTRL_ONLY) {
 856                         sp_select_context_up_one_layer(desktop);
 857                         ret = TRUE;
 858                     }
 859                     break;
 860                 case GDK_s:
 861                 case GDK_S:
 862                     if (MOD__SHIFT_ONLY) {
 863                         if (!selection->isEmpty()) {
 864                             seltrans->increaseState();
 865                         }
 866                         ret = TRUE;
 867                     }
 868                     break;
 869                 default:
 870                     break;
 871             }
 872             break;
 873
 874         case GDK_KEY_RELEASE:
 875             {
 876             guint keyval = get_group0_keyval(&event->key);
 877             if (key_is_a_modifier (keyval))
 878                 event_context->defaultMessageContext()->clear();
 879
 880             bool alt = ( MOD__ALT
 881                          || (keyval == GDK_Alt_L)
 882                          || (keyval == GDK_Alt_R)
 883                          || (keyval == GDK_Meta_L)
 884                          || (keyval == GDK_Meta_R));
 885
 886             if (Inkscape::Rubberband::get()->is_started()) {
 887                 // if Alt then change cursor to moving cursor:
 888                 if (alt) {
 889                     Inkscape::Rubberband::get()->setMode(RUBBERBAND_MODE_RECT);
 890                 }
 891             }
 892             }
 893             // set cursor to default.
 894             gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
 895             break;
 896         default:
 897             break;
 898     }
 899
 900     if (!ret) {
 901         if (((SPEventContextClass *) parent_class)->root_handler)
 902             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 903     }
 904
 905     return ret;
 906 }
 907
 908
 909 /*
 910   Local Variables:
 911   mode:c++
 912   c-file-style:"stroustrup"
 913   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 914   indent-tabs-mode:nil
 915   fill-column:99
 916   End:
 917 */
 918 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :