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