src/select-context.cpp

   1 #define __SP_SELECT_CONTEXT_C__
   2
   3 /*
   4  * Selection and transformation context
   5  *
   6  * Authors:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   bulia byak <buliabyak@users.sf.net>
   9  *
  10  * Copyright (C) 2006      Johan Engelen <johan@shouraizou.nl>
  11  * Copyright (C) 1999-2005 Authors
  12  *
  13  * Released under GNU GPL, read the file 'COPYING' for more information
  14  */
  15
  16 #ifdef HAVE_CONFIG_H
  17 # include "config.h"
  18 #endif
  19 #include <cstring>
  20 #include <string>
  21 #include <gdk/gdkkeysyms.h>
  22 #include "macros.h"
  23 #include "rubberband.h"
  24 #include "document.h"
  25 #include "selection.h"
  26 #include "seltrans-handles.h"
  27 #include "sp-cursor.h"
  28 #include "pixmaps/cursor-select-m.xpm"
  29 #include "pixmaps/cursor-select-d.xpm"
  30 #include "pixmaps/handles.xpm"
  31 #include <glibmm/i18n.h>
  32
  33 #include "select-context.h"
  34 #include "selection-chemistry.h"
  35 #include "desktop.h"
  36 #include "desktop-handles.h"
  37 #include "sp-root.h"
  38 #include "preferences.h"
  39 #include "tools-switch.h"
  40 #include "message-stack.h"
  41 #include "selection-describer.h"
  42 #include "seltrans.h"
  43 #include "box3d.h"
  44
  45 static void sp_select_context_class_init(SPSelectContextClass *klass);
  46 static void sp_select_context_init(SPSelectContext *select_context);
  47 static void sp_select_context_dispose(GObject *object);
  48
  49 static void sp_select_context_setup(SPEventContext *ec);
  50 static void sp_select_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val);
  51 static gint sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  52 static gint sp_select_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  53
  54 static SPEventContextClass *parent_class;
  55
  56 static GdkCursor *CursorSelectMouseover = NULL;
  57 static GdkCursor *CursorSelectDragging = NULL;
  58 GdkPixbuf *handles[13];
  59
  60 static gint rb_escaped = 0; // if non-zero, rubberband was canceled by esc, so the next button release should not deselect
  61 static gint drag_escaped = 0; // if non-zero, drag was canceled by esc
  62
  63 static gint xp = 0, yp = 0; // where drag started
  64 static gint tolerance = 0;
  65 static bool within_tolerance = false;
  66
  67 GtkType
  68 sp_select_context_get_type(void)
  69 {
  70     static GType type = 0;
  71     if (!type) {
  72         GTypeInfo info = {
  73             sizeof(SPSelectContextClass),
  74             NULL, NULL,
  75             (GClassInitFunc) sp_select_context_class_init,
  76             NULL, NULL,
  77             sizeof(SPSelectContext),
  78             4,
  79             (GInstanceInitFunc) sp_select_context_init,
  80             NULL,   /* value_table */
  81         };
  82         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPSelectContext", &info, (GTypeFlags)0);
  83     }
  84     return type;
  85 }
  86
  87 static void
  88 sp_select_context_class_init(SPSelectContextClass *klass)
  89 {
  90     GObjectClass *object_class = (GObjectClass *) klass;
  91     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  92
  93     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
  94
  95     object_class->dispose = sp_select_context_dispose;
  96
  97     event_context_class->setup = sp_select_context_setup;
  98     event_context_class->set = sp_select_context_set;
  99     event_context_class->root_handler = sp_select_context_root_handler;
 100     event_context_class->item_handler = sp_select_context_item_handler;
 101 }
 102
 103 static void
 104 sp_select_context_init(SPSelectContext *sc)
 105 {
 106     sc->dragging = FALSE;
 107     sc->moved = FALSE;
 108     sc->button_press_shift = false;
 109     sc->button_press_ctrl = false;
 110     sc->button_press_alt = false;
 111     sc->_seltrans = NULL;
 112     sc->_describer = NULL;
 113
 114     // cursors in select context
 115     CursorSelectMouseover = sp_cursor_new_from_xpm(cursor_select_m_xpm , 1, 1);
 116     CursorSelectDragging = sp_cursor_new_from_xpm(cursor_select_d_xpm , 1, 1);
 117     // selection handles
 118     handles[0]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_nw_xpm);
 119     handles[1]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_ne_xpm);
 120     handles[2]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_h_xpm);
 121     handles[3]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_scale_v_xpm);
 122     handles[4]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_nw_xpm);
 123     handles[5]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_n_xpm);
 124     handles[6]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_ne_xpm);
 125     handles[7]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_e_xpm);
 126     handles[8]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_se_xpm);
 127     handles[9]  = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_s_xpm);
 128     handles[10] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_sw_xpm);
 129     handles[11] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_w_xpm);
 130     handles[12] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_center_xpm);
 131 }
 132
 133 static void
 134 sp_select_context_dispose(GObject *object)
 135 {
 136     SPSelectContext *sc = SP_SELECT_CONTEXT(object);
 137     SPEventContext * ec = SP_EVENT_CONTEXT (object);
 138
 139     ec->enableGrDrag(false);
 140
 141     if (sc->grabbed) {
 142         sp_canvas_item_ungrab(sc->grabbed, GDK_CURRENT_TIME);
 143         sc->grabbed = NULL;
 144     }
 145
 146     delete sc->_seltrans;
 147     sc->_seltrans = NULL;
 148     delete sc->_describer;
 149     sc->_describer = NULL;
 150
 151     if (CursorSelectDragging) {
 152         gdk_cursor_unref (CursorSelectDragging);
 153         CursorSelectDragging = NULL;
 154     }
 155     if (CursorSelectMouseover) {
 156         gdk_cursor_unref (CursorSelectMouseover);
 157         CursorSelectMouseover = NULL;
 158     }
 159
 160     G_OBJECT_CLASS(parent_class)->dispose(object);
 161 }
 162
 163 static void
 164 sp_select_context_setup(SPEventContext *ec)
 165 {
 166     SPSelectContext *select_context = SP_SELECT_CONTEXT(ec);
 167
 168     if (((SPEventContextClass *) parent_class)->setup) {
 169         ((SPEventContextClass *) parent_class)->setup(ec);
 170     }
 171
 172     SPDesktop *desktop = ec->desktop;
 173
 174     select_context->_describer = new Inkscape::SelectionDescriber(
 175                 desktop->selection,
 176                 desktop->messageStack(),
 177                 _("Click selection to toggle scale/rotation handles"),
 178                 _("No objects selected. Click, Shift+click, or drag around objects to select.")
 179         );
 180
 181     select_context->_seltrans = new Inkscape::SelTrans(desktop);
 182
 183     sp_event_context_read(ec, "show");
 184     sp_event_context_read(ec, "transform");
 185
 186     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 187     if (prefs->getBool("/tools/select/gradientdrag")) {
 188         ec->enableGrDrag();
 189     }
 190 }
 191
 192 static void
 193 sp_select_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val)
 194 {
 195     SPSelectContext *sc = SP_SELECT_CONTEXT(ec);
 196     Glib::ustring path = val->getEntryName();
 197
 198     if (path == "show") {
 199         if (val->getString() == "outline") {
 200             sc->_seltrans->setShow(Inkscape::SelTrans::SHOW_OUTLINE);
 201         } else {
 202             sc->_seltrans->setShow(Inkscape::SelTrans::SHOW_CONTENT);
 203         }
 204     }
 205 }
 206
 207 static bool
 208 sp_select_context_abort(SPEventContext *event_context)
 209 {
 210     SPDesktop *desktop = event_context->desktop;
 211     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 212     Inkscape::SelTrans *seltrans = sc->_seltrans;
 213
 214     if (sc->dragging) {
 215         if (sc->moved) { // cancel dragging an object
 216             seltrans->ungrab();
 217             sc->moved = FALSE;
 218             sc->dragging = FALSE;
 219             sp_event_context_discard_delayed_snap_event(event_context);
 220             drag_escaped = 1;
 221
 222             if (sc->item) {
 223                 // only undo if the item is still valid
 224                 if (SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))) {
 225                     sp_document_undo(sp_desktop_document(desktop));
 226                 }
 227
 228                 sp_object_unref( SP_OBJECT(sc->item), NULL);
 229             } else if (sc->button_press_ctrl) {
 230                 // NOTE:  This is a workaround to a bug.
 231                 // When the ctrl key is held, sc->item is not defined
 232                 // so in this case (only), we skip the object doc check
 233                 sp_document_undo(sp_desktop_document(desktop));
 234             }
 235             sc->item = NULL;
 236
 237             SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Move canceled."));
 238             return true;
 239         }
 240     } else {
 241         if (Inkscape::Rubberband::get(desktop)->is_started()) {
 242             Inkscape::Rubberband::get(desktop)->stop();
 243             rb_escaped = 1;
 244             SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 245             SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Selection canceled."));
 246             return true;
 247         }
 248     }
 249     return false;
 250 }
 251
 252 bool
 253 key_is_a_modifier (guint key) {
 254     return (key == GDK_Alt_L ||
 255                 key == GDK_Alt_R ||
 256                 key == GDK_Control_L ||
 257                 key == GDK_Control_R ||
 258                 key == GDK_Shift_L ||
 259                 key == GDK_Shift_R ||
 260                 key == GDK_Meta_L ||  // Meta is when you press Shift+Alt (at least on my machine)
 261             key == GDK_Meta_R);
 262 }
 263
 264 void
 265 sp_select_context_up_one_layer(SPDesktop *desktop)
 266 {
 267     /* Click in empty place, go up one level -- but don't leave a layer to root.
 268      *
 269      * (Rationale: we don't usually allow users to go to the root, since that
 270      * detracts from the layer metaphor: objects at the root level can in front
 271      * of or behind layers.  Whereas it's fine to go to the root if editing
 272      * a document that has no layers (e.g. a non-Inkscape document).)
 273      *
 274      * Once we support editing SVG "islands" (e.g. <svg> embedded in an xhtml
 275      * document), we might consider further restricting the below to disallow
 276      * leaving a layer to go to a non-layer.
 277      */
 278     SPObject *const current_layer = desktop->currentLayer();
 279     if (current_layer) {
 280         SPObject *const parent = SP_OBJECT_PARENT(current_layer);
 281         if ( parent
 282              && ( SP_OBJECT_PARENT(parent)
 283                   || !( SP_IS_GROUP(current_layer)
 284                         && ( SPGroup::LAYER
 285                              == SP_GROUP(current_layer)->layerMode() ) ) ) )
 286         {
 287             desktop->setCurrentLayer(parent);
 288             if (SP_IS_GROUP(current_layer) && SPGroup::LAYER != SP_GROUP(current_layer)->layerMode())
 289                 sp_desktop_selection(desktop)->set(current_layer);
 290         }
 291     }
 292 }
 293
 294 static gint
 295 sp_select_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 296 {
 297     gint ret = FALSE;
 298
 299     SPDesktop *desktop = event_context->desktop;
 300     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 301     Inkscape::SelTrans *seltrans = sc->_seltrans;
 302
 303     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 304     tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 305
 306     // make sure we still have valid objects to move around
 307     if (sc->item && SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))==NULL) {
 308         sp_select_context_abort(event_context);
 309     }
 310
 311     switch (event->type) {
 312         case GDK_BUTTON_PRESS:
 313             if (event->button.button == 1 && !event_context->space_panning) {
 314                 /* Left mousebutton */
 315
 316                 // save drag origin
 317                 xp = (gint) event->button.x;
 318                 yp = (gint) event->button.y;
 319                 within_tolerance = true;
 320
 321                 // remember what modifiers were on before button press
 322                 sc->button_press_shift = (event->button.state & GDK_SHIFT_MASK) ? true : false;
 323                 sc->button_press_ctrl = (event->button.state & GDK_CONTROL_MASK) ? true : false;
 324                 sc->button_press_alt = (event->button.state & GDK_MOD1_MASK) ? true : false;
 325
 326                 if (event->button.state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK | GDK_MOD1_MASK)) {
 327                     // if shift or ctrl was pressed, do not move objects;
 328                     // pass the event to root handler which will perform rubberband, shift-click, ctrl-click, ctrl-drag
 329                 } else {
 330                     sc->dragging = TRUE;
 331                     sc->moved = FALSE;
 332
 333                     gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectDragging);
 334
 335                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 336
 337                     // remember the clicked item in sc->item:
 338                     if (sc->item) {
 339                         sp_object_unref(sc->item, NULL);
 340                         sc->item = NULL;
 341                     }
 342                     sc->item = sp_event_context_find_item (desktop,
 343                                               Geom::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 344                     sp_object_ref(sc->item, NULL);
 345
 346                     rb_escaped = drag_escaped = 0;
 347
 348                     if (sc->grabbed) {
 349                         sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 350                         sc->grabbed = NULL;
 351                     }
 352                     sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->drawing),
 353                                         GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_PRESS_MASK |
 354                                         GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK,
 355                                         NULL, event->button.time);
 356                     sc->grabbed = SP_CANVAS_ITEM(desktop->drawing);
 357
 358                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 359
 360                     ret = TRUE;
 361                 }
 362             } else if (event->button.button == 3) {
 363                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 364                 sp_select_context_abort(event_context);
 365             }
 366             break;
 367
 368         case GDK_ENTER_NOTIFY:
 369         {
 370             if (!desktop->isWaitingCursor() && !sc->dragging) {
 371                 gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectMouseover);
 372             }
 373             break;
 374         }
 375
 376         case GDK_LEAVE_NOTIFY:
 377             if (!desktop->isWaitingCursor() && !sc->dragging)
 378                 gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
 379             break;
 380
 381         case GDK_KEY_PRESS:
 382             if (get_group0_keyval (&event->key) == GDK_space) {
 383                 if (sc->dragging && sc->grabbed) {
 384                     /* stamping mode: show content mode moving */
 385                     seltrans->stamp();
 386                     ret = TRUE;
 387                 }
 388             }
 389             break;
 390
 391         default:
 392             break;
 393     }
 394
 395     if (!ret) {
 396         if (((SPEventContextClass *) parent_class)->item_handler)
 397             ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 398     }
 399
 400     return ret;
 401 }
 402
 403 static gint
 404 sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 405 {
 406     SPItem *item = NULL;
 407     SPItem *item_at_point = NULL, *group_at_point = NULL, *item_in_group = NULL;
 408     gint ret = FALSE;
 409
 410     SPDesktop *desktop = event_context->desktop;
 411     SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
 412     Inkscape::SelTrans *seltrans = sc->_seltrans;
 413     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 414     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 415
 416     // make sure we still have valid objects to move around
 417     if (sc->item && SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))==NULL) {
 418         sp_select_context_abort(event_context);
 419     }
 420
 421     switch (event->type) {
 422         case GDK_2BUTTON_PRESS:
 423             if (event->button.button == 1) {
 424                 if (!selection->isEmpty()) {
 425                     SPItem *clicked_item = (SPItem *) selection->itemList()->data;
 426                     if (SP_IS_GROUP(clicked_item) && !SP_IS_BOX3D(clicked_item)) { // enter group if it's not a 3D box
 427                         desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 428                         sp_desktop_selection(desktop)->clear();
 429                         sc->dragging = false;
 430                         sp_event_context_discard_delayed_snap_event(event_context);
 431
 432                         sp_canvas_end_forced_full_redraws(desktop->canvas);
 433                     } else { // switch tool
 434                         Geom::Point const button_pt(event->button.x, event->button.y);
 435                         Geom::Point const p(desktop->w2d(button_pt));
 436                         tools_switch_by_item (desktop, clicked_item, p);
 437                     }
 438                 } else {
 439                     sp_select_context_up_one_layer(desktop);
 440                 }
 441                 ret = TRUE;
 442             }
 443             break;
 444         case GDK_BUTTON_PRESS:
 445             if (event->button.button == 1 && !event_context->space_panning) {
 446
 447                 // save drag origin
 448                 xp = (gint) event->button.x;
 449                 yp = (gint) event->button.y;
 450                 within_tolerance = true;
 451
 452                 Geom::Point const button_pt(event->button.x, event->button.y);
 453                 Geom::Point const p(desktop->w2d(button_pt));
 454                 if (event->button.state & GDK_MOD1_MASK)
 455                     Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_TOUCHPATH);
 456                 Inkscape::Rubberband::get(desktop)->start(desktop, p);
 457                 if (sc->grabbed) {
 458                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 459                     sc->grabbed = NULL;
 460                 }
 461                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 462                                     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,
 463                                     NULL, event->button.time);
 464                 sc->grabbed = SP_CANVAS_ITEM(desktop->acetate);
 465
 466                 // remember what modifiers were on before button press
 467                 sc->button_press_shift = (event->button.state & GDK_SHIFT_MASK) ? true : false;
 468                 sc->button_press_ctrl = (event->button.state & GDK_CONTROL_MASK) ? true : false;
 469                 sc->button_press_alt = (event->button.state & GDK_MOD1_MASK) ? true : false;
 470
 471                 sc->moved = FALSE;
 472
 473                 rb_escaped = drag_escaped = 0;
 474
 475                 ret = TRUE;
 476             } else if (event->button.button == 3) {
 477                 // right click; do not eat it so that right-click menu can appear, but cancel dragging & rubberband
 478                 sp_select_context_abort(event_context);
 479             }
 480             break;
 481
 482         case GDK_MOTION_NOTIFY:
 483                 tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 484                 if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {
 485                 Geom::Point const motion_pt(event->motion.x, event->motion.y);
 486                 Geom::Point const p(desktop->w2d(motion_pt));
 487
 488                 if ( within_tolerance
 489                      && ( abs( (gint) event->motion.x - xp ) < tolerance )
 490                      && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
 491                     break; // do not drag if we're within tolerance from origin
 492                 }
 493                 // Once the user has moved farther than tolerance from the original location
 494                 // (indicating they intend to move the object, not click), then always process the
 495                 // motion notify coordinates as given (no snapping back to origin)
 496                 within_tolerance = false;
 497
 498                 if (sc->button_press_ctrl || (sc->button_press_alt && !sc->button_press_shift && !selection->isEmpty())) {
 499                     // if it's not click and ctrl or alt was pressed (the latter with some selection
 500                     // but not with shift) we want to drag rather than rubberband
 501                         sc->dragging = TRUE;
 502                     gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectDragging);
 503
 504                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 505                 }
 506
 507                 if (sc->dragging) {
 508                     /* User has dragged fast, so we get events on root (lauris)*/
 509                     // not only that; we will end up here when ctrl-dragging as well
 510                     // and also when we started within tolerance, but trespassed tolerance outside of item
 511                     Inkscape::Rubberband::get(desktop)->stop();
 512                     SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 513                     item_at_point = desktop->item_at_point(Geom::Point(event->button.x, event->button.y), FALSE);
 514                     if (!item_at_point) // if no item at this point, try at the click point (bug 1012200)
 515                         item_at_point = desktop->item_at_point(Geom::Point(xp, yp), FALSE);
 516                     if (item_at_point || sc->moved || sc->button_press_alt) {
 517                         // drag only if starting from an item, or if something is already grabbed, or if alt-dragging
 518                         if (!sc->moved) {
 519                             item_in_group = desktop->item_at_point(Geom::Point(event->button.x, event->button.y), TRUE);
 520                             group_at_point = desktop->group_at_point(Geom::Point(event->button.x, event->button.y));
 521                             if (SP_IS_LAYER(selection->single()))
 522                                 group_at_point = SP_GROUP(selection->single());
 523
 524                             // group-at-point is meant to be topmost item if it's a group,
 525                             // not topmost group of all items at point
 526                             if (group_at_point != item_in_group &&
 527                                 !(group_at_point && item_at_point &&
 528                                   group_at_point->isAncestorOf(item_at_point)))
 529                                 group_at_point = NULL;
 530
 531                             // if neither a group nor an item (possibly in a group) at point are selected, set selection to the item at point
 532                             if ((!item_in_group || !selection->includes(item_in_group)) &&
 533                                 (!group_at_point || !selection->includes(group_at_point))
 534                                 && !sc->button_press_alt) {
 535                                 // select what is under cursor
 536                                 if (!seltrans->isEmpty()) {
 537                                     seltrans->resetState();
 538                                 }
 539                                 // when simply ctrl-dragging, we don't want to go into groups
 540                                 if (item_at_point && !selection->includes(item_at_point))
 541                                     selection->set(item_at_point);
 542                             } // otherwise, do not change selection so that dragging selected-within-group items, as well as alt-dragging, is possible
 543                             seltrans->grab(p, -1, -1, FALSE, TRUE);
 544                             sc->moved = TRUE;
 545                         }
 546                         if (!seltrans->isEmpty())
 547                             seltrans->moveTo(p, event->button.state);
 548                         desktop->scroll_to_point(p);
 549                         gobble_motion_events(GDK_BUTTON1_MASK);
 550                         ret = TRUE;
 551                     } else {
 552                         sc->dragging = FALSE;
 553                         sp_event_context_discard_delayed_snap_event(event_context);
 554                         sp_canvas_end_forced_full_redraws(desktop->canvas);
 555                     }
 556                 } else {
 557                     if (Inkscape::Rubberband::get(desktop)->is_started()) {
 558                         Inkscape::Rubberband::get(desktop)->move(p);
 559                         if (Inkscape::Rubberband::get(desktop)->getMode() == RUBBERBAND_MODE_TOUCHPATH) {
 560                             event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Draw over</b> objects to select them; release <b>Alt</b> to switch to rubberband selection"));
 561                         } else {
 562                             event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Drag around</b> objects to select them; press <b>Alt</b> to switch to touch selection"));
 563                         }
 564                         gobble_motion_events(GDK_BUTTON1_MASK);
 565                     }
 566                 }
 567             }
 568             break;
 569         case GDK_BUTTON_RELEASE:
 570             xp = yp = 0;
 571             if ((event->button.button == 1) && (sc->grabbed) && !event_context->space_panning) {
 572                 if (sc->dragging) {
 573                     if (sc->moved) {
 574                         // item has been moved
 575                         seltrans->ungrab();
 576                         sc->moved = FALSE;
 577                     } else if (sc->item && !drag_escaped) {
 578                         // item has not been moved -> simply a click, do selecting
 579                         if (!selection->isEmpty()) {
 580                             if (event->button.state & GDK_SHIFT_MASK) {
 581                                 // with shift, toggle selection
 582                                 seltrans->resetState();
 583                                 selection->toggle(sc->item);
 584                             } else {
 585                                 SPObject* single = selection->single();
 586                                 // without shift, increase state (i.e. toggle scale/rotation handles)
 587                                 if (selection->includes(sc->item)) {
 588                                     seltrans->increaseState();
 589                                 } else if (SP_IS_LAYER(single) && single->isAncestorOf(sc->item)) {
 590                                     seltrans->increaseState();
 591                                 } else {
 592                                     seltrans->resetState();
 593                                     selection->set(sc->item);
 594                                 }
 595                             }
 596                         } else { // simple or shift click, no previous selection
 597                             seltrans->resetState();
 598                             selection->set(sc->item);
 599                         }
 600                     }
 601                     sc->dragging = FALSE;
 602                     gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectMouseover);
 603                     sp_event_context_discard_delayed_snap_event(event_context);
 604                     sp_canvas_end_forced_full_redraws(desktop->canvas);
 605
 606                     if (sc->item) {
 607                         sp_object_unref( SP_OBJECT(sc->item), NULL);
 608                     }
 609                     sc->item = NULL;
 610                 } else {
 611                     Inkscape::Rubberband *r = Inkscape::Rubberband::get(desktop);
 612                     if (r->is_started() && !within_tolerance) {
 613                         // this was a rubberband drag
 614                         GSList *items = NULL;
 615                         if (r->getMode() == RUBBERBAND_MODE_RECT) {
 616                             Geom::OptRect const b = r->getRectangle();
 617                             items = sp_document_items_in_box(sp_desktop_document(desktop), desktop->dkey, *b);
 618                         } else if (r->getMode() == RUBBERBAND_MODE_TOUCHPATH) {
 619                             items = sp_document_items_at_points(sp_desktop_document(desktop), desktop->dkey, r->getPoints());
 620                         }
 621
 622                         seltrans->resetState();
 623                         r->stop();
 624                         SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
 625
 626                         if (event->button.state & GDK_SHIFT_MASK) {
 627                             // with shift, add to selection
 628                             selection->addList (items);
 629                         } else {
 630                             // without shift, simply select anew
 631                             selection->setList (items);
 632                         }
 633                         g_slist_free (items);
 634                     } else { // it was just a click, or a too small rubberband
 635                         r->stop();
 636                         if (sc->button_press_shift && !rb_escaped && !drag_escaped) {
 637                             // this was a shift+click or alt+shift+click, select what was clicked upon
 638
 639                             sc->button_press_shift = false;
 640
 641                             if (sc->button_press_ctrl) {
 642                                 // go into groups, honoring Alt
 643                                 item = sp_event_context_find_item (desktop,
 644                                                    Geom::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, TRUE);
 645                                 sc->button_press_ctrl = FALSE;
 646                             } else {
 647                                 // don't go into groups, honoring Alt
 648                                 item = sp_event_context_find_item (desktop,
 649                                                    Geom::Point(event->button.x, event->button.y), event->button.state & GDK_MOD1_MASK, FALSE);
 650                             }
 651
 652                             if (item) {
 653                                 selection->toggle(item);
 654                                 item = NULL;
 655                             }
 656
 657                         } else if ((sc->button_press_ctrl || sc->button_press_alt) && !rb_escaped && !drag_escaped) { // ctrl+click, alt+click
 658
 659                             item = sp_event_context_find_item (desktop,
 660                                          Geom::Point(event->button.x, event->button.y), sc->button_press_alt, sc->button_press_ctrl);
 661
 662                             sc->button_press_ctrl = FALSE;
 663                             sc->button_press_alt = FALSE;
 664
 665                             if (item) {
 666                                 if (selection->includes(item)) {
 667                                     seltrans->increaseState();
 668                                 } else {
 669                                     seltrans->resetState();
 670                                     selection->set(item);
 671                                 }
 672                                 item = NULL;
 673                             }
 674
 675                         } else { // click without shift, simply deselect, unless with Alt or something was cancelled
 676                             if (!selection->isEmpty()) {
 677                                 if (!(rb_escaped) && !(drag_escaped) && !(event->button.state & GDK_MOD1_MASK))
 678                                     selection->clear();
 679                                 rb_escaped = 0;
 680                                 ret = TRUE;
 681                             }
 682                         }
 683                     }
 684                     ret = TRUE;
 685                 }
 686                 if (sc->grabbed) {
 687                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
 688                     sc->grabbed = NULL;
 689                 }
 690
 691                 desktop->updateNow();
 692             }
 693             if (event->button.button == 1) {
 694                 Inkscape::Rubberband::get(desktop)->stop(); // might have been started in another tool!
 695             }
 696             sc->button_press_shift = false;
 697             sc->button_press_ctrl = false;
 698             sc->button_press_alt = false;
 699             break;
 700
 701         case GDK_KEY_PRESS: // keybindings for select context
 702
 703                         {
 704                         {
 705                 guint keyval = get_group0_keyval(&event->key);
 706             bool alt = ( MOD__ALT
 707                                     || (keyval == GDK_Alt_L)
 708                                     || (keyval == GDK_Alt_R)
 709                                     || (keyval == GDK_Meta_L)
 710                                     || (keyval == GDK_Meta_R));
 711
 712             if (!key_is_a_modifier (keyval)) {
 713                     event_context->defaultMessageContext()->clear();
 714             } else if (sc->grabbed || seltrans->isGrabbed()) {
 715                 if (Inkscape::Rubberband::get(desktop)->is_started()) {
 716                     // if Alt then change cursor to moving cursor:
 717                     if (alt) {
 718                         Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_TOUCHPATH);
 719                     }
 720                 } else {
 721                 // do not change the statusbar text when mousekey is down to move or transform the object,
 722                 // because the statusbar text is already updated somewhere else.
 723                    break;
 724                 }
 725             } else {
 726                     sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
 727                                                 _("<b>Ctrl</b>: click to select in groups; drag to move hor/vert"),
 728                                                 _("<b>Shift</b>: click to toggle select; drag for rubberband selection"),
 729                                                 _("<b>Alt</b>: click to select under; drag to move selected or select by touch"));
 730                     // if Alt and nonempty selection, show moving cursor ("move selected"):
 731                     if (alt && !selection->isEmpty() && !desktop->isWaitingCursor()) {
 732                         gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectDragging);
 733                     }
 734                     //*/
 735                     break;
 736             }
 737                         }
 738
 739             gdouble const nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000); // in px
 740                         gdouble const offset = prefs->getDoubleLimited("/options/defaultscale/value", 2, 0, 1000);
 741                         int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
 742
 743                         switch (get_group0_keyval (&event->key)) {
 744                 case GDK_Left: // move selection left
 745                 case GDK_KP_Left:
 746                 case GDK_KP_4:
 747                     if (!MOD__CTRL) { // not ctrl
 748                         gint mul = 1 + gobble_key_events(
 749                             get_group0_keyval(&event->key), 0); // with any mask
 750                         if (MOD__ALT) { // alt
 751                             if (MOD__SHIFT) sp_selection_move_screen(desktop, mul*-10, 0); // shift
 752                             else sp_selection_move_screen(desktop, mul*-1, 0); // no shift
 753                         }
 754                         else { // no alt
 755                             if (MOD__SHIFT) sp_selection_move(desktop, mul*-10*nudge, 0); // shift
 756                             else sp_selection_move(desktop, mul*-nudge, 0); // no shift
 757                         }
 758                         ret = TRUE;
 759                     }
 760                     break;
 761                 case GDK_Up: // move selection up
 762                 case GDK_KP_Up:
 763                 case GDK_KP_8:
 764                     if (!MOD__CTRL) { // not ctrl
 765                         gint mul = 1 + gobble_key_events(
 766                             get_group0_keyval(&event->key), 0); // with any mask
 767                         if (MOD__ALT) { // alt
 768                             if (MOD__SHIFT) sp_selection_move_screen(desktop, 0, mul*10); // shift
 769                             else sp_selection_move_screen(desktop, 0, mul*1); // no shift
 770                         }
 771                         else { // no alt
 772                             if (MOD__SHIFT) sp_selection_move(desktop, 0, mul*10*nudge); // shift
 773                             else sp_selection_move(desktop, 0, mul*nudge); // no shift
 774                         }
 775                         ret = TRUE;
 776                     }
 777                     break;
 778                 case GDK_Right: // move selection right
 779                 case GDK_KP_Right:
 780                 case GDK_KP_6:
 781                     if (!MOD__CTRL) { // not ctrl
 782                         gint mul = 1 + gobble_key_events(
 783                             get_group0_keyval(&event->key), 0); // with any mask
 784                         if (MOD__ALT) { // alt
 785                             if (MOD__SHIFT) sp_selection_move_screen(desktop, mul*10, 0); // shift
 786                             else sp_selection_move_screen(desktop, mul*1, 0); // no shift
 787                         }
 788                         else { // no alt
 789                             if (MOD__SHIFT) sp_selection_move(desktop, mul*10*nudge, 0); // shift
 790                             else sp_selection_move(desktop, mul*nudge, 0); // no shift
 791                         }
 792                         ret = TRUE;
 793                     }
 794                     break;
 795                 case GDK_Down: // move selection down
 796                 case GDK_KP_Down:
 797                 case GDK_KP_2:
 798                     if (!MOD__CTRL) { // not ctrl
 799                         gint mul = 1 + gobble_key_events(
 800                             get_group0_keyval(&event->key), 0); // with any mask
 801                         if (MOD__ALT) { // alt
 802                             if (MOD__SHIFT) sp_selection_move_screen(desktop, 0, mul*-10); // shift
 803                             else sp_selection_move_screen(desktop, 0, mul*-1); // no shift
 804                         }
 805                         else { // no alt
 806                             if (MOD__SHIFT) sp_selection_move(desktop, 0, mul*-10*nudge); // shift
 807                             else sp_selection_move(desktop, 0, mul*-nudge); // no shift
 808                         }
 809                         ret = TRUE;
 810                     }
 811                     break;
 812                 case GDK_Escape:
 813                     if (!sp_select_context_abort(event_context))
 814                         selection->clear();
 815                     ret = TRUE;
 816                     break;
 817                 case GDK_a:
 818                 case GDK_A:
 819                     if (MOD__CTRL_ONLY) {
 820                         sp_edit_select_all(desktop);
 821                         ret = TRUE;
 822                     }
 823                     break;
 824                 case GDK_space:
 825                     /* stamping mode: show outline mode moving */
 826                     /* FIXME: Is next condition ok? (lauris) */
 827                     if (sc->dragging && sc->grabbed) {
 828                         seltrans->stamp();
 829                         ret = TRUE;
 830                     }
 831                     break;
 832                 case GDK_x:
 833                 case GDK_X:
 834                     if (MOD__ALT_ONLY) {
 835                         desktop->setToolboxFocusTo ("altx");
 836                         ret = TRUE;
 837                     }
 838                     break;
 839                 case GDK_bracketleft:
 840                     if (MOD__ALT) {
 841                         gint mul = 1 + gobble_key_events(
 842                             get_group0_keyval(&event->key), 0); // with any mask
 843                         sp_selection_rotate_screen(selection, mul*1);
 844                     } else if (MOD__CTRL) {
 845                         sp_selection_rotate(selection, 90);
 846                     } else if (snaps) {
 847                         sp_selection_rotate(selection, 180/snaps);
 848                     }
 849                     ret = TRUE;
 850                     break;
 851                 case GDK_bracketright:
 852                     if (MOD__ALT) {
 853                         gint mul = 1 + gobble_key_events(
 854                             get_group0_keyval(&event->key), 0); // with any mask
 855                         sp_selection_rotate_screen(selection, -1*mul);
 856                     } else if (MOD__CTRL) {
 857                         sp_selection_rotate(selection, -90);
 858                     } else if (snaps) {
 859                         sp_selection_rotate(selection, -180/snaps);
 860                     }
 861                     ret = TRUE;
 862                     break;
 863                 case GDK_less:
 864                 case GDK_comma:
 865                     if (MOD__ALT) {
 866                         gint mul = 1 + gobble_key_events(
 867                             get_group0_keyval(&event->key), 0); // with any mask
 868                         sp_selection_scale_screen(selection, -2*mul);
 869                     } else if (MOD__CTRL) {
 870                         sp_selection_scale_times(selection, 0.5);
 871                     } else {
 872                         gint mul = 1 + gobble_key_events(
 873                             get_group0_keyval(&event->key), 0); // with any mask
 874                         sp_selection_scale(selection, -offset*mul);
 875                     }
 876                     ret = TRUE;
 877                     break;
 878                 case GDK_greater:
 879                 case GDK_period:
 880                     if (MOD__ALT) {
 881                         gint mul = 1 + gobble_key_events(
 882                             get_group0_keyval(&event->key), 0); // with any mask
 883                         sp_selection_scale_screen(selection, 2*mul);
 884                     } else if (MOD__CTRL) {
 885                         sp_selection_scale_times(selection, 2);
 886                     } else {
 887                         gint mul = 1 + gobble_key_events(
 888                             get_group0_keyval(&event->key), 0); // with any mask
 889                         sp_selection_scale(selection, offset*mul);
 890                     }
 891                     ret = TRUE;
 892                     break;
 893                 case GDK_Return:
 894                     if (MOD__CTRL_ONLY) {
 895                         if (selection->singleItem()) {
 896                             SPItem *clicked_item = selection->singleItem();
 897                             if ( SP_IS_GROUP(clicked_item) ||
 898                                  SP_IS_BOX3D(clicked_item)) { // enter group or a 3D box
 899                                 desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
 900                                 sp_desktop_selection(desktop)->clear();
 901                             } else {
 902                                 SP_EVENT_CONTEXT(sc)->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Selected object is not a group. Cannot enter."));
 903                             }
 904                         }
 905                         ret = TRUE;
 906                     }
 907                     break;
 908                 case GDK_BackSpace:
 909                     if (MOD__CTRL_ONLY) {
 910                         sp_select_context_up_one_layer(desktop);
 911                         ret = TRUE;
 912                     }
 913                     break;
 914                 case GDK_s:
 915                 case GDK_S:
 916                     if (MOD__SHIFT_ONLY) {
 917                         if (!selection->isEmpty()) {
 918                             seltrans->increaseState();
 919                         }
 920                         ret = TRUE;
 921                     }
 922                     break;
 923                 case GDK_g:
 924                 case GDK_G:
 925                     if (MOD__SHIFT_ONLY) {
 926                         sp_selection_to_guides(desktop);
 927                         ret = true;
 928                     }
 929                     break;
 930                 default:
 931                     break;
 932             }
 933             break;
 934                         }
 935         case GDK_KEY_RELEASE:
 936             {
 937             guint keyval = get_group0_keyval(&event->key);
 938             if (key_is_a_modifier (keyval))
 939                 event_context->defaultMessageContext()->clear();
 940
 941             bool alt = ( MOD__ALT
 942                          || (keyval == GDK_Alt_L)
 943                          || (keyval == GDK_Alt_R)
 944                          || (keyval == GDK_Meta_L)
 945                          || (keyval == GDK_Meta_R));
 946
 947             if (Inkscape::Rubberband::get(desktop)->is_started()) {
 948                 // if Alt then change cursor to moving cursor:
 949                 if (alt) {
 950                     Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_RECT);
 951                 }
 952             }
 953             }
 954             // set cursor to default.
 955             if (!desktop->isWaitingCursor()) {
 956                 gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
 957             }
 958             break;
 959         default:
 960             break;
 961     }
 962
 963     if (!ret) {
 964         if (((SPEventContextClass *) parent_class)->root_handler)
 965             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 966     }
 967
 968     return ret;
 969 }
 970
 971
 972 /*
 973   Local Variables:
 974   mode:c++
 975   c-file-style:"stroustrup"
 976   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 977   indent-tabs-mode:nil
 978   fill-column:99
 979   End:
 980 */
 981 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :