src/select-context.cpp

   1 /*
   2  * Selection and transformation context
   3  *
   4  * Authors:
   5  *   Lauris Kaplinski <lauris@kaplinski.com>
   6  *   bulia byak <buliabyak@users.sf.net>
   7  *   Abhishek Sharma
   8  *
   9  * Copyright (C) 2006      Johan Engelen <johan@shouraizou.nl>
  10  * Copyright (C) 1999-2005 Authors
  11  *
  12  * Released under GNU GPL, read the file 'COPYING' for more information
  13  */
  14
  15 #ifdef HAVE_CONFIG_H
  16 # include "config.h"
  17 #endif
  18 #include <cstring>
  19 #include <string>
  20 #include <gdk/gdkkeysyms.h>
  21 #include "macros.h"
  22 #include "rubberband.h"
  23 #include "document.h"
  24 #include "selection.h"
  25 #include "seltrans-handles.h"
  26 #include "sp-cursor.h"
  27 #include "pixmaps/cursor-select-m.xpm"
  28 #include "pixmaps/cursor-select-d.xpm"
  29 #include "pixmaps/handles.xpm"
  30 #include <glibmm/i18n.h>
  31
  32 #include "select-context.h"
  33 #include "selection-chemistry.h"
  34 #include "desktop.h"
  35 #include "desktop-handles.h"
  36 #include "sp-root.h"
  37 #include "preferences.h"
  38 #include "tools-switch.h"
  39 #include "message-stack.h"
  40 #include "selection-describer.h"
  41 #include "seltrans.h"
  42 #include "box3d.h"
  43
  44 using Inkscape::DocumentUndo;
  45
  46 static void sp_select_context_class_init(SPSelectContextClass *klass);
  47 static void sp_select_context_init(SPSelectContext *select_context);
  48 static void sp_select_context_dispose(GObject *object);
  49
  50 static void sp_select_context_setup(SPEventContext *ec);
  51 static void sp_select_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val);
  52 static gint sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  53 static gint sp_select_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  54
  55 static SPEventContextClass *parent_class;
  56
  57 static GdkCursor *CursorSelectMouseover = NULL;
  58 static GdkCursor *CursorSelectDragging = NULL;
  59 GdkPixbuf *handles[13];
  60
  61 static gint rb_escaped = 0; // if non-zero, rubberband was canceled by esc, so the next button release should not deselect
  62 static gint drag_escaped = 0; // if non-zero, drag was canceled by esc
  63
  64 static gint xp = 0, yp = 0; // where drag started
  65 static gint tolerance = 0;
  66 static bool within_tolerance = false;
  67
  68 GtkType
  69 sp_select_context_get_type(void)
  70 {
  71     static GType type = 0;
  72     if (!type) {
  73         GTypeInfo info = {
  74             sizeof(SPSelectContextClass),
  75             NULL, NULL,
  76             (GClassInitFunc) sp_select_context_class_init,
  77             NULL, NULL,
  78             sizeof(SPSelectContext),
  79             4,
  80             (GInstanceInitFunc) sp_select_context_init,
  81             NULL,   /* value_table */
  82         };
  83         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPSelectContext", &info, (GTypeFlags)0);
  84     }
  85     return type;
  86 }
  87
  88 static void
  89 sp_select_context_class_init(SPSelectContextClass *klass)
  90 {
  91     GObjectClass *object_class = (GObjectClass *) klass;
  92     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  93
  94     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
  95
  96     object_class->dispose = sp_select_context_dispose;
  97
  98     event_context_class->setup = sp_select_context_setup;
  99     event_context_class->set = sp_select_context_set;
 100     event_context_class->root_handler = sp_select_context_root_handler;
 101     event_context_class->item_handler = sp_select_context_item_handler;
 102 }
 103
 104 static void
 105 sp_select_context_init(SPSelectContext *sc)
 106 {
 107     sc->dragging = FALSE;
 108     sc->moved = FALSE;
 109     sc->button_press_shift = false;
 110     sc->button_press_ctrl = false;
 111     sc->button_press_alt = false;
 112     sc->_seltrans = NULL;
 113     sc->_describer = NULL;
 114
 115     // cursors in select context
 116     CursorSelectMouseover = sp_cursor_new_from_xpm(cursor_select_m_xpm , 1, 1);
 117     CursorSelectDragging = sp_cursor_new_from_xpm(cursor_select_d_xpm , 1, 1);
 118     // selection handles
 119     handles[0]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_nw_xpm);
 120     handles[1]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_ne_xpm);
 121     handles[2]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_h_xpm);
 122     handles[3]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_v_xpm);
 123     handles[4]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_nw_xpm);
 124     handles[5]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_n_xpm);
 125     handles[6]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_ne_xpm);
 126     handles[7]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_e_xpm);
 127     handles[8]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_se_xpm);
 128     handles[9]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_s_xpm);
 129     handles[10] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_sw_xpm);
 130     handles[11] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_w_xpm);
 131     handles[12] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_center_xpm);
 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(
 176                 desktop->selection,
 177                 desktop->messageStack(),
 178                 _("Click selection to toggle scale/rotation handles"),
 179                 _("No objects selected. Click, Shift+click, or drag around objects to select.")
 180         );
 181
 182     select_context->_seltrans = new Inkscape::SelTrans(desktop);
 183
 184     sp_event_context_read(ec, "show");
 185     sp_event_context_read(ec, "transform");
 186
 187     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 188     if (prefs->getBool("/tools/select/gradientdrag")) {
 189         ec->enableGrDrag();
 190     }
 191 }
 192
 193 static void
 194 sp_select_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val)
 195 {
 196     SPSelectContext *sc = SP_SELECT_CONTEXT(ec);
 197     Glib::ustring path = val->getEntryName();
 198
 199     if (path == "show") {
 200         if (val->getString() == "outline") {
 201             sc->_seltrans->setShow(Inkscape::SelTrans::SHOW_OUTLINE);
 202         } else {
 203             sc->_seltrans->setShow(Inkscape::SelTrans::SHOW_CONTENT);
 204         }
 205     }
 206 }
 207
 208 static bool
 209 sp_select_context_abort(SPEventContext *event_context)
 210 {
 211     SPDesktop *desktop = event_context->desktop;
 212     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 213     Inkscape::SelTrans *seltrans = sc->_seltrans;
 214
 215     if (sc->dragging) {
 216         if (sc->moved) { // cancel dragging an object
 217             seltrans->ungrab();
 218             sc->moved = FALSE;
 219             sc->dragging = FALSE;
 220             sp_event_context_discard_delayed_snap_event(event_context);
 221             drag_escaped = 1;
 222
 223             if (sc->item) {
 224                 // only undo if the item is still valid
 225                 if (SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))) {
 226                     DocumentUndo::undo(sp_desktop_document(desktop));
 227                 }
 228
 229                 sp_object_unref( SP_OBJECT(sc->item), NULL);
 230             } else if (sc->button_press_ctrl) {
 231                 // NOTE:  This is a workaround to a bug.
 232                 // When the ctrl key is held, sc->item is not defined
 233                 // so in this case (only), we skip the object doc check
 234                 DocumentUndo::undo(sp_desktop_document(desktop));
 235             }
 236             sc->item = NULL;
 237
 238             SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Move canceled."));
 239             return true;
 240         }
 241     } else {
 242         if (Inkscape::Rubberband::get(desktop)->is_started()) {
 243             Inkscape::Rubberband::get(desktop)->stop();
 244             rb_escaped = 1;
 245             SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 246             SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Selection canceled."));
 247             return true;
 248         }
 249     }
 250     return false;
 251 }
 252
 253 bool
 254 key_is_a_modifier (guint key) {
 255     return (key == GDK_Alt_L ||
 256                 key == GDK_Alt_R ||
 257                 key == GDK_Control_L ||
 258                 key == GDK_Control_R ||
 259                 key == GDK_Shift_L ||
 260                 key == GDK_Shift_R ||
 261                 key == GDK_Meta_L ||  // Meta is when you press Shift+Alt (at least on my machine)
 262             key == GDK_Meta_R);
 263 }
 264
 265 void
 266 sp_select_context_up_one_layer(SPDesktop *desktop)
 267 {
 268     /* Click in empty place, go up one level -- but don't leave a layer to root.
 269      *
 270      * (Rationale: we don't usually allow users to go to the root, since that
 271      * detracts from the layer metaphor: objects at the root level can in front
 272      * of or behind layers.  Whereas it's fine to go to the root if editing
 273      * a document that has no layers (e.g. a non-Inkscape document).)
 274      *
 275      * Once we support editing SVG "islands" (e.g. <svg> embedded in an xhtml
 276      * document), we might consider further restricting the below to disallow
 277      * leaving a layer to go to a non-layer.
 278      */
 279     SPObject *const current_layer = desktop->currentLayer();
 280     if (current_layer) {
 281         SPObject *const parent = SP_OBJECT_PARENT(current_layer);
 282         if ( parent
 283              && ( SP_OBJECT_PARENT(parent)
 284                   || !( SP_IS_GROUP(current_layer)
 285                         && ( SPGroup::LAYER
 286                              == SP_GROUP(current_layer)->layerMode() ) ) ) )
 287         {
 288             desktop->setCurrentLayer(parent);
 289             if (SP_IS_GROUP(current_layer) && SPGroup::LAYER != SP_GROUP(current_layer)->layerMode())
 290                 sp_desktop_selection(desktop)->set(current_layer);
 291         }
 292     }
 293 }
 294
 295 static gint
 296 sp_select_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 297 {
 298     gint ret = FALSE;
 299
 300     SPDesktop *desktop = event_context->desktop;
 301     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 302     Inkscape::SelTrans *seltrans = sc->_seltrans;
 303
 304     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 305     tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 306
 307     // make sure we still have valid objects to move around
 308     if (sc->item && SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))==NULL) {
 309         sp_select_context_abort(event_context);
 310     }
 311
 312     switch (event->type) {
 313         case GDK_BUTTON_PRESS:
 314             if (event->button.button == 1 && !event_context->space_panning) {
 315                 /* Left mousebutton */
 316
 317                 // save drag origin
 318                 xp = (gint) event->button.x;
 319                 yp = (gint) event->button.y;
 320                 within_tolerance = true;
 321
 322                 // remember what modifiers were on before button press
 323                 sc->button_press_shift = (event->button.state & GDK_SHIFT_MASK) ? true : false;
 324                 sc->button_press_ctrl = (event->button.state & GDK_CONTROL_MASK) ? true : false;
 325                 sc->button_press_alt = (event->button.state & GDK_MOD1_MASK) ? true : false;
 326
 327                 if (event->button.state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK | GDK_MOD1_MASK)) {
 328                     // if shift or ctrl was pressed, do not move objects;
 329                     // pass the event to root handler which will perform rubberband, shift-click, ctrl-click, ctrl-drag
 330                 } else {
 331                     sc->dragging = TRUE;
 332                     sc->moved = FALSE;
 333
 334                     gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectDragging);
 335
 336                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 337
 338                     // remember the clicked item in sc->item:
 339                     if (sc->item) {
 340                         sp_object_unref(sc->item, NULL);
 341                         sc->item = NULL;
 342                     }
 343                     sc->item = sp_event_context_find_item (desktop,
 344                                               Geom::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 345                     sp_object_ref(sc->item, NULL);
 346
 347                     rb_escaped = drag_escaped = 0;
 348
 349                     if (sc->grabbed) {
 350                         sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 351                         sc->grabbed = NULL;
 352                     }
 353                     sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->drawing),
 354                                         GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_PRESS_MASK |
 355                                         GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK,
 356                                         NULL, event->button.time);
 357                     sc->grabbed = SP_CANVAS_ITEM(desktop->drawing);
 358
 359                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 360
 361                     ret = TRUE;
 362                 }
 363             } else if (event->button.button == 3) {
 364                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 365                 sp_select_context_abort(event_context);
 366             }
 367             break;
 368
 369         case GDK_ENTER_NOTIFY:
 370         {
 371             if (!desktop->isWaitingCursor() && !sc->dragging) {
 372                 gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectMouseover);
 373             }
 374             break;
 375         }
 376
 377         case GDK_LEAVE_NOTIFY:
 378             if (!desktop->isWaitingCursor() && !sc->dragging)
 379                 gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
 380             break;
 381
 382         case GDK_KEY_PRESS:
 383             if (get_group0_keyval (&event->key) == GDK_space) {
 384                 if (sc->dragging && sc->grabbed) {
 385                     /* stamping mode: show content mode moving */
 386                     seltrans->stamp();
 387                     ret = TRUE;
 388                 }
 389             }
 390             break;
 391
 392         default:
 393             break;
 394     }
 395
 396     if (!ret) {
 397         if (((SPEventContextClass *) parent_class)->item_handler)
 398             ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 399     }
 400
 401     return ret;
 402 }
 403
 404 static gint
 405 sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 406 {
 407     SPItem *item = NULL;
 408     SPItem *item_at_point = NULL, *group_at_point = NULL, *item_in_group = NULL;
 409     gint ret = FALSE;
 410
 411     SPDesktop *desktop = event_context->desktop;
 412     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 413     Inkscape::SelTrans *seltrans = sc->_seltrans;
 414     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 415     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 416
 417     // make sure we still have valid objects to move around
 418     if (sc->item && SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))==NULL) {
 419         sp_select_context_abort(event_context);
 420     }
 421
 422     switch (event->type) {
 423         case GDK_2BUTTON_PRESS:
 424             if (event->button.button == 1) {
 425                 if (!selection->isEmpty()) {
 426                     SPItem *clicked_item = (SPItem *) selection->itemList()->data;
 427                     if (SP_IS_GROUP(clicked_item) && !SP_IS_BOX3D(clicked_item)) { // enter group if it's not a 3D box
 428                         desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 429                         sp_desktop_selection(desktop)->clear();
 430                         sc->dragging = false;
 431                         sp_event_context_discard_delayed_snap_event(event_context);
 432
 433                         sp_canvas_end_forced_full_redraws(desktop->canvas);
 434                     } else { // switch tool
 435                         Geom::Point const button_pt(event->button.x, event->button.y);
 436                         Geom::Point const p(desktop->w2d(button_pt));
 437                         tools_switch_by_item (desktop, clicked_item, p);
 438                     }
 439                 } else {
 440                     sp_select_context_up_one_layer(desktop);
 441                 }
 442                 ret = TRUE;
 443             }
 444             break;
 445         case GDK_BUTTON_PRESS:
 446             if (event->button.button == 1 && !event_context->space_panning) {
 447
 448                 // save drag origin
 449                 xp = (gint) event->button.x;
 450                 yp = (gint) event->button.y;
 451                 within_tolerance = true;
 452
 453                 Geom::Point const button_pt(event->button.x, event->button.y);
 454                 Geom::Point const p(desktop->w2d(button_pt));
 455                 if (event->button.state & GDK_MOD1_MASK)
 456                     Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_TOUCHPATH);
 457                 Inkscape::Rubberband::get(desktop)->start(desktop, p);
 458                 if (sc->grabbed) {
 459                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 460                     sc->grabbed = NULL;
 461                 }
 462                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 463                                     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,
 464                                     NULL, event->button.time);
 465                 sc->grabbed = SP_CANVAS_ITEM(desktop->acetate);
 466
 467                 // remember what modifiers were on before button press
 468                 sc->button_press_shift = (event->button.state & GDK_SHIFT_MASK) ? true : false;
 469                 sc->button_press_ctrl = (event->button.state & GDK_CONTROL_MASK) ? true : false;
 470                 sc->button_press_alt = (event->button.state & GDK_MOD1_MASK) ? true : false;
 471
 472                 sc->moved = FALSE;
 473
 474                 rb_escaped = drag_escaped = 0;
 475
 476                 ret = TRUE;
 477             } else if (event->button.button == 3) {
 478                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 479                 sp_select_context_abort(event_context);
 480             }
 481             break;
 482
 483         case GDK_MOTION_NOTIFY:
 484                 tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 485                 if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {
 486                 Geom::Point const motion_pt(event->motion.x, event->motion.y);
 487                 Geom::Point const p(desktop->w2d(motion_pt));
 488
 489                 if ( within_tolerance
 490                      && ( abs( (gint) event->motion.x - xp ) < tolerance )
 491                      && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
 492                     break; // do not drag if we're within tolerance from origin
 493                 }
 494                 // Once the user has moved farther than tolerance from the original location
 495                 // (indicating they intend to move the object, not click), then always process the
 496                 // motion notify coordinates as given (no snapping back to origin)
 497                 within_tolerance = false;
 498
 499                 if (sc->button_press_ctrl || (sc->button_press_alt && !sc->button_press_shift && !selection->isEmpty())) {
 500                     // if it's not click and ctrl or alt was pressed (the latter with some selection
 501                     // but not with shift) we want to drag rather than rubberband
 502                         sc->dragging = TRUE;
 503                     gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectDragging);
 504
 505                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 506                 }
 507
 508                 if (sc->dragging) {
 509                     /* User has dragged fast, so we get events on root (lauris)*/
 510                     // not only that; we will end up here when ctrl-dragging as well
 511                     // and also when we started within tolerance, but trespassed tolerance outside of item
 512                     Inkscape::Rubberband::get(desktop)->stop();
 513                     SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 514                     item_at_point = desktop->getItemAtPoint(Geom::Point(event->button.x, event->button.y), FALSE);
 515                     if (!item_at_point) // if no item at this point, try at the click point (bug 1012200)
 516                         item_at_point = desktop->getItemAtPoint(Geom::Point(xp, yp), FALSE);
 517                     if (item_at_point || sc->moved || sc->button_press_alt) {
 518                         // drag only if starting from an item, or if something is already grabbed, or if alt-dragging
 519                         if (!sc->moved) {
 520                             item_in_group = desktop->getItemAtPoint(Geom::Point(event->button.x, event->button.y), TRUE);
 521                             group_at_point = desktop->getGroupAtPoint(Geom::Point(event->button.x, event->button.y));
 522                             if (SP_IS_LAYER(selection->single()))
 523                                 group_at_point = SP_GROUP(selection->single());
 524
 525                             // group-at-point is meant to be topmost item if it's a group,
 526                             // not topmost group of all items at point
 527                             if (group_at_point != item_in_group &&
 528                                 !(group_at_point && item_at_point &&
 529                                   group_at_point->isAncestorOf(item_at_point)))
 530                                 group_at_point = NULL;
 531
 532                             // if neither a group nor an item (possibly in a group) at point are selected, set selection to the item at point
 533                             if ((!item_in_group || !selection->includes(item_in_group)) &&
 534                                 (!group_at_point || !selection->includes(group_at_point))
 535                                 && !sc->button_press_alt) {
 536                                 // select what is under cursor
 537                                 if (!seltrans->isEmpty()) {
 538                                     seltrans->resetState();
 539                                 }
 540                                 // when simply ctrl-dragging, we don't want to go into groups
 541                                 if (item_at_point && !selection->includes(item_at_point))
 542                                     selection->set(item_at_point);
 543                             } // otherwise, do not change selection so that dragging selected-within-group items, as well as alt-dragging, is possible
 544                             seltrans->grab(p, -1, -1, FALSE, TRUE);
 545                             sc->moved = TRUE;
 546                         }
 547                         if (!seltrans->isEmpty())
 548                             seltrans->moveTo(p, event->button.state);
 549                         desktop->scroll_to_point(p);
 550                         gobble_motion_events(GDK_BUTTON1_MASK);
 551                         ret = TRUE;
 552                     } else {
 553                         sc->dragging = FALSE;
 554                         sp_event_context_discard_delayed_snap_event(event_context);
 555                         sp_canvas_end_forced_full_redraws(desktop->canvas);
 556                     }
 557                 } else {
 558                     if (Inkscape::Rubberband::get(desktop)->is_started()) {
 559                         Inkscape::Rubberband::get(desktop)->move(p);
 560                         if (Inkscape::Rubberband::get(desktop)->getMode() == RUBBERBAND_MODE_TOUCHPATH) {
 561                             event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Draw over</b> objects to select them; release <b>Alt</b> to switch to rubberband selection"));
 562                         } else {
 563                             event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Drag around</b> objects to select them; press <b>Alt</b> to switch to touch selection"));
 564                         }
 565                         gobble_motion_events(GDK_BUTTON1_MASK);
 566                     }
 567                 }
 568             }
 569             break;
 570         case GDK_BUTTON_RELEASE:
 571             xp = yp = 0;
 572             if ((event->button.button == 1) && (sc->grabbed) && !event_context->space_panning) {
 573                 if (sc->dragging) {
 574                     if (sc->moved) {
 575                         // item has been moved
 576                         seltrans->ungrab();
 577                         sc->moved = FALSE;
 578                     } else if (sc->item && !drag_escaped) {
 579                         // item has not been moved -> simply a click, do selecting
 580                         if (!selection->isEmpty()) {
 581                             if (event->button.state & GDK_SHIFT_MASK) {
 582                                 // with shift, toggle selection
 583                                 seltrans->resetState();
 584                                 selection->toggle(sc->item);
 585                             } else {
 586                                 SPObject* single = selection->single();
 587                                 // without shift, increase state (i.e. toggle scale/rotation handles)
 588                                 if (selection->includes(sc->item)) {
 589                                     seltrans->increaseState();
 590                                 } else if (SP_IS_LAYER(single) && single->isAncestorOf(sc->item)) {
 591                                     seltrans->increaseState();
 592                                 } else {
 593                                     seltrans->resetState();
 594                                     selection->set(sc->item);
 595                                 }
 596                             }
 597                         } else { // simple or shift click, no previous selection
 598                             seltrans->resetState();
 599                             selection->set(sc->item);
 600                         }
 601                     }
 602                     sc->dragging = FALSE;
 603                     gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectMouseover);
 604                     sp_event_context_discard_delayed_snap_event(event_context);
 605                     sp_canvas_end_forced_full_redraws(desktop->canvas);
 606
 607                     if (sc->item) {
 608                         sp_object_unref( SP_OBJECT(sc->item), NULL);
 609                     }
 610                     sc->item = NULL;
 611                 } else {
 612                     Inkscape::Rubberband *r = Inkscape::Rubberband::get(desktop);
 613                     if (r->is_started() && !within_tolerance) {
 614                         // this was a rubberband drag
 615                         GSList *items = NULL;
 616                         if (r->getMode() == RUBBERBAND_MODE_RECT) {
 617                             Geom::OptRect const b = r->getRectangle();
 618                             items = sp_desktop_document(desktop)->getItemsInBox(desktop->dkey, *b);
 619                         } else if (r->getMode() == RUBBERBAND_MODE_TOUCHPATH) {
 620                             items = sp_desktop_document(desktop)->getItemsAtPoints(desktop->dkey, r->getPoints());
 621                         }
 622
 623                         seltrans->resetState();
 624                         r->stop();
 625                         SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 626
 627                         if (event->button.state & GDK_SHIFT_MASK) {
 628                             // with shift, add to selection
 629                             selection->addList (items);
 630                         } else {
 631                             // without shift, simply select anew
 632                             selection->setList (items);
 633                         }
 634                         g_slist_free (items);
 635                     } else { // it was just a click, or a too small rubberband
 636                         r->stop();
 637                         if (sc->button_press_shift && !rb_escaped && !drag_escaped) {
 638                             // this was a shift+click or alt+shift+click, select what was clicked upon
 639
 640                             sc->button_press_shift = false;
 641
 642                             if (sc->button_press_ctrl) {
 643                                 // go into groups, honoring Alt
 644                                 item = sp_event_context_find_item (desktop,
 645                                                    Geom::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, TRUE);
 646                                 sc->button_press_ctrl = FALSE;
 647                             } else {
 648                                 // don't go into groups, honoring Alt
 649                                 item = sp_event_context_find_item (desktop,
 650                                                    Geom::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 651                             }
 652
 653                             if (item) {
 654                                 selection->toggle(item);
 655                                 item = NULL;
 656                             }
 657
 658                         } else if ((sc->button_press_ctrl || sc->button_press_alt) && !rb_escaped && !drag_escaped) { // ctrl+click, alt+click
 659
 660                             item = sp_event_context_find_item (desktop,
 661                                          Geom::Point(event->button.x, event->button.y), sc->button_press_alt, sc->button_press_ctrl);
 662
 663                             sc->button_press_ctrl = FALSE;
 664                             sc->button_press_alt = FALSE;
 665
 666                             if (item) {
 667                                 if (selection->includes(item)) {
 668                                     seltrans->increaseState();
 669                                 } else {
 670                                     seltrans->resetState();
 671                                     selection->set(item);
 672                                 }
 673                                 item = NULL;
 674                             }
 675
 676                         } else { // click without shift, simply deselect, unless with Alt or something was cancelled
 677                             if (!selection->isEmpty()) {
 678                                 if (!(rb_escaped) && !(drag_escaped) && !(event->button.state & GDK_MOD1_MASK))
 679                                     selection->clear();
 680                                 rb_escaped = 0;
 681                                 ret = TRUE;
 682                             }
 683                         }
 684                     }
 685                     ret = TRUE;
 686                 }
 687                 if (sc->grabbed) {
 688                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 689                     sc->grabbed = NULL;
 690                 }
 691
 692                 desktop->updateNow();
 693             }
 694             if (event->button.button == 1) {
 695                 Inkscape::Rubberband::get(desktop)->stop(); // might have been started in another tool!
 696             }
 697             sc->button_press_shift = false;
 698             sc->button_press_ctrl = false;
 699             sc->button_press_alt = false;
 700             break;
 701
 702         case GDK_KEY_PRESS: // keybindings for select context
 703
 704                         {
 705                         {
 706                 guint keyval = get_group0_keyval(&event->key);
 707             bool alt = ( MOD__ALT
 708                                     || (keyval == GDK_Alt_L)
 709                                     || (keyval == GDK_Alt_R)
 710                                     || (keyval == GDK_Meta_L)
 711                                     || (keyval == GDK_Meta_R));
 712
 713             if (!key_is_a_modifier (keyval)) {
 714                     event_context->defaultMessageContext()->clear();
 715             } else if (sc->grabbed || seltrans->isGrabbed()) {
 716                 if (Inkscape::Rubberband::get(desktop)->is_started()) {
 717                     // if Alt then change cursor to moving cursor:
 718                     if (alt) {
 719                         Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_TOUCHPATH);
 720                     }
 721                 } else {
 722                 // do not change the statusbar text when mousekey is down to move or transform the object,
 723                 // because the statusbar text is already updated somewhere else.
 724                    break;
 725                 }
 726             } else {
 727                     sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
 728                                                 _("<b>Ctrl</b>: click to select in groups; drag to move hor/vert"),
 729                                                 _("<b>Shift</b>: click to toggle select; drag for rubberband selection"),
 730                                                 _("<b>Alt</b>: click to select under; drag to move selected or select by touch"));
 731                     // if Alt and nonempty selection, show moving cursor ("move selected"):
 732                     if (alt && !selection->isEmpty() && !desktop->isWaitingCursor()) {
 733                         gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectDragging);
 734                     }
 735                     //*/
 736                     break;
 737             }
 738                         }
 739
 740             gdouble const nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000); // in px
 741                         gdouble const offset = prefs->getDoubleLimited("/options/defaultscale/value", 2, 0, 1000);
 742                         int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
 743
 744                         switch (get_group0_keyval (&event->key)) {
 745                 case GDK_Left: // move selection left
 746                 case GDK_KP_Left:
 747                 case GDK_KP_4:
 748                     if (!MOD__CTRL) { // not ctrl
 749                         gint mul = 1 + gobble_key_events(
 750                             get_group0_keyval(&event->key), 0); // with any mask
 751                         if (MOD__ALT) { // alt
 752                             if (MOD__SHIFT) sp_selection_move_screen(desktop, mul*-10, 0); // shift
 753                             else sp_selection_move_screen(desktop, mul*-1, 0); // no shift
 754                         }
 755                         else { // no alt
 756                             if (MOD__SHIFT) sp_selection_move(desktop, mul*-10*nudge, 0); // shift
 757                             else sp_selection_move(desktop, mul*-nudge, 0); // no shift
 758                         }
 759                         ret = TRUE;
 760                     }
 761                     break;
 762                 case GDK_Up: // move selection up
 763                 case GDK_KP_Up:
 764                 case GDK_KP_8:
 765                     if (!MOD__CTRL) { // not ctrl
 766                         gint mul = 1 + gobble_key_events(
 767                             get_group0_keyval(&event->key), 0); // with any mask
 768                         if (MOD__ALT) { // alt
 769                             if (MOD__SHIFT) sp_selection_move_screen(desktop, 0, mul*10); // shift
 770                             else sp_selection_move_screen(desktop, 0, mul*1); // no shift
 771                         }
 772                         else { // no alt
 773                             if (MOD__SHIFT) sp_selection_move(desktop, 0, mul*10*nudge); // shift
 774                             else sp_selection_move(desktop, 0, mul*nudge); // no shift
 775                         }
 776                         ret = TRUE;
 777                     }
 778                     break;
 779                 case GDK_Right: // move selection right
 780                 case GDK_KP_Right:
 781                 case GDK_KP_6:
 782                     if (!MOD__CTRL) { // not ctrl
 783                         gint mul = 1 + gobble_key_events(
 784                             get_group0_keyval(&event->key), 0); // with any mask
 785                         if (MOD__ALT) { // alt
 786                             if (MOD__SHIFT) sp_selection_move_screen(desktop, mul*10, 0); // shift
 787                             else sp_selection_move_screen(desktop, mul*1, 0); // no shift
 788                         }
 789                         else { // no alt
 790                             if (MOD__SHIFT) sp_selection_move(desktop, mul*10*nudge, 0); // shift
 791                             else sp_selection_move(desktop, mul*nudge, 0); // no shift
 792                         }
 793                         ret = TRUE;
 794                     }
 795                     break;
 796                 case GDK_Down: // move selection down
 797                 case GDK_KP_Down:
 798                 case GDK_KP_2:
 799                     if (!MOD__CTRL) { // not ctrl
 800                         gint mul = 1 + gobble_key_events(
 801                             get_group0_keyval(&event->key), 0); // with any mask
 802                         if (MOD__ALT) { // alt
 803                             if (MOD__SHIFT) sp_selection_move_screen(desktop, 0, mul*-10); // shift
 804                             else sp_selection_move_screen(desktop, 0, mul*-1); // no shift
 805                         }
 806                         else { // no alt
 807                             if (MOD__SHIFT) sp_selection_move(desktop, 0, mul*-10*nudge); // shift
 808                             else sp_selection_move(desktop, 0, mul*-nudge); // no shift
 809                         }
 810                         ret = TRUE;
 811                     }
 812                     break;
 813                 case GDK_Escape:
 814                     if (!sp_select_context_abort(event_context))
 815                         selection->clear();
 816                     ret = TRUE;
 817                     break;
 818                 case GDK_a:
 819                 case GDK_A:
 820                     if (MOD__CTRL_ONLY) {
 821                         sp_edit_select_all(desktop);
 822                         ret = TRUE;
 823                     }
 824                     break;
 825                 case GDK_space:
 826                     /* stamping mode: show outline mode moving */
 827                     /* FIXME: Is next condition ok? (lauris) */
 828                     if (sc->dragging && sc->grabbed) {
 829                         seltrans->stamp();
 830                         ret = TRUE;
 831                     }
 832                     break;
 833                 case GDK_x:
 834                 case GDK_X:
 835                     if (MOD__ALT_ONLY) {
 836                         desktop->setToolboxFocusTo ("altx");
 837                         ret = TRUE;
 838                     }
 839                     break;
 840                 case GDK_bracketleft:
 841                     if (MOD__ALT) {
 842                         gint mul = 1 + gobble_key_events(
 843                             get_group0_keyval(&event->key), 0); // with any mask
 844                         sp_selection_rotate_screen(selection, mul*1);
 845                     } else if (MOD__CTRL) {
 846                         sp_selection_rotate(selection, 90);
 847                     } else if (snaps) {
 848                         sp_selection_rotate(selection, 180/snaps);
 849                     }
 850                     ret = TRUE;
 851                     break;
 852                 case GDK_bracketright:
 853                     if (MOD__ALT) {
 854                         gint mul = 1 + gobble_key_events(
 855                             get_group0_keyval(&event->key), 0); // with any mask
 856                         sp_selection_rotate_screen(selection, -1*mul);
 857                     } else if (MOD__CTRL) {
 858                         sp_selection_rotate(selection, -90);
 859                     } else if (snaps) {
 860                         sp_selection_rotate(selection, -180/snaps);
 861                     }
 862                     ret = TRUE;
 863                     break;
 864                 case GDK_less:
 865                 case GDK_comma:
 866                     if (MOD__ALT) {
 867                         gint mul = 1 + gobble_key_events(
 868                             get_group0_keyval(&event->key), 0); // with any mask
 869                         sp_selection_scale_screen(selection, -2*mul);
 870                     } else if (MOD__CTRL) {
 871                         sp_selection_scale_times(selection, 0.5);
 872                     } else {
 873                         gint mul = 1 + gobble_key_events(
 874                             get_group0_keyval(&event->key), 0); // with any mask
 875                         sp_selection_scale(selection, -offset*mul);
 876                     }
 877                     ret = TRUE;
 878                     break;
 879                 case GDK_greater:
 880                 case GDK_period:
 881                     if (MOD__ALT) {
 882                         gint mul = 1 + gobble_key_events(
 883                             get_group0_keyval(&event->key), 0); // with any mask
 884                         sp_selection_scale_screen(selection, 2*mul);
 885                     } else if (MOD__CTRL) {
 886                         sp_selection_scale_times(selection, 2);
 887                     } else {
 888                         gint mul = 1 + gobble_key_events(
 889                             get_group0_keyval(&event->key), 0); // with any mask
 890                         sp_selection_scale(selection, offset*mul);
 891                     }
 892                     ret = TRUE;
 893                     break;
 894                 case GDK_Return:
 895                     if (MOD__CTRL_ONLY) {
 896                         if (selection->singleItem()) {
 897                             SPItem *clicked_item = selection->singleItem();
 898                             if ( SP_IS_GROUP(clicked_item) ||
 899                                  SP_IS_BOX3D(clicked_item)) { // enter group or a 3D box
 900                                 desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 901                                 sp_desktop_selection(desktop)->clear();
 902                             } else {
 903                                 SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Selected object is not a group. Cannot enter."));
 904                             }
 905                         }
 906                         ret = TRUE;
 907                     }
 908                     break;
 909                 case GDK_BackSpace:
 910                     if (MOD__CTRL_ONLY) {
 911                         sp_select_context_up_one_layer(desktop);
 912                         ret = TRUE;
 913                     }
 914                     break;
 915                 case GDK_s:
 916                 case GDK_S:
 917                     if (MOD__SHIFT_ONLY) {
 918                         if (!selection->isEmpty()) {
 919                             seltrans->increaseState();
 920                         }
 921                         ret = TRUE;
 922                     }
 923                     break;
 924                 case GDK_g:
 925                 case GDK_G:
 926                     if (MOD__SHIFT_ONLY) {
 927                         sp_selection_to_guides(desktop);
 928                         ret = true;
 929                     }
 930                     break;
 931                 default:
 932                     break;
 933             }
 934             break;
 935                         }
 936         case GDK_KEY_RELEASE:
 937             {
 938             guint keyval = get_group0_keyval(&event->key);
 939             if (key_is_a_modifier (keyval))
 940                 event_context->defaultMessageContext()->clear();
 941
 942             bool alt = ( MOD__ALT
 943                          || (keyval == GDK_Alt_L)
 944                          || (keyval == GDK_Alt_R)
 945                          || (keyval == GDK_Meta_L)
 946                          || (keyval == GDK_Meta_R));
 947
 948             if (Inkscape::Rubberband::get(desktop)->is_started()) {
 949                 // if Alt then change cursor to moving cursor:
 950                 if (alt) {
 951                     Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_RECT);
 952                 }
 953             }
 954             }
 955             // set cursor to default.
 956             if (!desktop->isWaitingCursor()) {
 957                 gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
 958             }
 959             break;
 960         default:
 961             break;
 962     }
 963
 964     if (!ret) {
 965         if (((SPEventContextClass *) parent_class)->root_handler)
 966             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 967     }
 968
 969     return ret;
 970 }
 971
 972
 973 /*
 974   Local Variables:
 975   mode:c++
 976   c-file-style:"stroustrup"
 977   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 978   indent-tabs-mode:nil
 979   fill-column:99
 980   End:
 981 */
 982 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :