src/box3d-context.cpp

   1 #define __SP_3DBOX_CONTEXT_C__
   2
   3 /*
   4  * 3D box drawing context
   5  *
   6  * Author:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   bulia byak <buliabyak@users.sf.net>
   9  *
  10  * Copyright (C) 2007      Maximilian Albert <Anhalter42@gmx.de>
  11  * Copyright (C) 2006      Johan Engelen <johan@shouraizou.nl>
  12  * Copyright (C) 2000-2005 authors
  13  * Copyright (C) 2000-2001 Ximian, Inc.
  14  *
  15  * Released under GNU GPL, read the file 'COPYING' for more information
  16  */
  17
  18 #include "config.h"
  19
  20 #include <gdk/gdkkeysyms.h>
  21
  22 #include "macros.h"
  23 #include "display/sp-canvas.h"
  24 #include "document.h"
  25 #include "sp-namedview.h"
  26 #include "selection.h"
  27 #include "desktop-handles.h"
  28 #include "snap.h"
  29 #include "display/curve.h"
  30 #include "desktop.h"
  31 #include "message-context.h"
  32 #include "pixmaps/cursor-rect.xpm"
  33 #include "box3d.h"
  34 #include "box3d-context.h"
  35 #include "sp-metrics.h"
  36 #include <glibmm/i18n.h>
  37 #include "object-edit.h"
  38 #include "xml/repr.h"
  39 #include "xml/node-event-vector.h"
  40 #include "prefs-utils.h"
  41 #include "context-fns.h"
  42
  43 static void sp_3dbox_context_class_init(SP3DBoxContextClass *klass);
  44 static void sp_3dbox_context_init(SP3DBoxContext *box3d_context);
  45 static void sp_3dbox_context_dispose(GObject *object);
  46
  47 static void sp_3dbox_context_setup(SPEventContext *ec);
  48 static void sp_3dbox_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  49
  50 static gint sp_3dbox_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  51 static gint sp_3dbox_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  52
  53 static void sp_3dbox_drag(SP3DBoxContext &bc, guint state);
  54 static void sp_3dbox_finish(SP3DBoxContext *bc);
  55
  56 static SPEventContextClass *parent_class;
  57
  58
  59 GtkType sp_3dbox_context_get_type()
  60 {
  61     static GType type = 0;
  62     if (!type) {
  63         GTypeInfo info = {
  64             sizeof(SP3DBoxContextClass),
  65             NULL, NULL,
  66             (GClassInitFunc) sp_3dbox_context_class_init,
  67             NULL, NULL,
  68             sizeof(SP3DBoxContext),
  69             4,
  70             (GInstanceInitFunc) sp_3dbox_context_init,
  71             NULL,    /* value_table */
  72         };
  73         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SP3DBoxContext", &info, (GTypeFlags) 0);
  74     }
  75     return type;
  76 }
  77
  78 static void sp_3dbox_context_class_init(SP3DBoxContextClass *klass)
  79 {
  80     GObjectClass *object_class = (GObjectClass *) klass;
  81     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  82
  83     parent_class = (SPEventContextClass *) g_type_class_peek_parent(klass);
  84
  85     object_class->dispose = sp_3dbox_context_dispose;
  86
  87     event_context_class->setup = sp_3dbox_context_setup;
  88     event_context_class->set = sp_3dbox_context_set;
  89     event_context_class->root_handler  = sp_3dbox_context_root_handler;
  90     event_context_class->item_handler  = sp_3dbox_context_item_handler;
  91 }
  92
  93 Box3D::Perspective3D * Box3D::Perspective3D::current_perspective = NULL;
  94 guint SP3DBoxContext::number_of_handles = 3;
  95
  96 static void sp_3dbox_context_init(SP3DBoxContext *box3d_context)
  97 {
  98     SPEventContext *event_context = SP_EVENT_CONTEXT(box3d_context);
  99
 100     event_context->cursor_shape = cursor_rect_xpm;
 101     event_context->hot_x = 4;
 102     event_context->hot_y = 4;
 103     event_context->xp = 0;
 104     event_context->yp = 0;
 105     event_context->tolerance = 0;
 106     event_context->within_tolerance = false;
 107     event_context->item_to_select = NULL;
 108
 109     event_context->shape_repr = NULL;
 110     event_context->shape_knot_holder = NULL;
 111
 112     box3d_context->item = NULL;
 113
 114     box3d_context->ctrl_dragged = false;
 115     box3d_context->extruded = false;
 116
 117     new (&box3d_context->sel_changed_connection) sigc::connection();
 118 }
 119
 120 static void sp_3dbox_context_dispose(GObject *object)
 121 {
 122     SP3DBoxContext *bc = SP_3DBOX_CONTEXT(object);
 123     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 124
 125     ec->enableGrDrag(false);
 126
 127     bc->sel_changed_connection.disconnect();
 128     bc->sel_changed_connection.~connection();
 129
 130     /* fixme: This is necessary because we do not grab */
 131     if (bc->item) {
 132         sp_3dbox_finish(bc);
 133     }
 134
 135     if (ec->shape_knot_holder) {
 136         sp_knot_holder_destroy(ec->shape_knot_holder);
 137         ec->shape_knot_holder = NULL;
 138     }
 139
 140     if (ec->shape_repr) { // remove old listener
 141         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 142         Inkscape::GC::release(ec->shape_repr);
 143         ec->shape_repr = 0;
 144     }
 145
 146     if (bc->_message_context) {
 147         delete bc->_message_context;
 148     }
 149
 150     G_OBJECT_CLASS(parent_class)->dispose(object);
 151 }
 152
 153 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
 154     NULL, /* child_added */
 155     NULL, /* child_removed */
 156     ec_shape_event_attr_changed,
 157     NULL, /* content_changed */
 158     NULL  /* order_changed */
 159 };
 160
 161 /**
 162 \brief  Callback that processes the "changed" signal on the selection;
 163 destroys old and creates new knotholder
 164 */
 165 void sp_3dbox_context_selection_changed(Inkscape::Selection *selection, gpointer data)
 166 {
 167     SP3DBoxContext *bc = SP_3DBOX_CONTEXT(data);
 168     SPEventContext *ec = SP_EVENT_CONTEXT(bc);
 169
 170     if (ec->shape_knot_holder) { // destroy knotholder
 171         sp_knot_holder_destroy(ec->shape_knot_holder);
 172         ec->shape_knot_holder = NULL;
 173     }
 174
 175     if (ec->shape_repr) { // remove old listener
 176         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 177         Inkscape::GC::release(ec->shape_repr);
 178         ec->shape_repr = 0;
 179     }
 180
 181     SPItem *item = selection->singleItem();
 182     if (item) {
 183         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 184         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 185         if (shape_repr) {
 186             ec->shape_repr = shape_repr;
 187             Inkscape::GC::anchor(shape_repr);
 188             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 189         }
 190     }
 191 }
 192
 193 static void sp_3dbox_context_setup(SPEventContext *ec)
 194 {
 195     SP3DBoxContext *bc = SP_3DBOX_CONTEXT(ec);
 196
 197     if (((SPEventContextClass *) parent_class)->setup) {
 198         ((SPEventContextClass *) parent_class)->setup(ec);
 199     }
 200
 201     SPItem *item = sp_desktop_selection(ec->desktop)->singleItem();
 202     if (item) {
 203         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 204         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 205         if (shape_repr) {
 206             ec->shape_repr = shape_repr;
 207             Inkscape::GC::anchor(shape_repr);
 208             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 209         }
 210     }
 211
 212     bc->sel_changed_connection.disconnect();
 213     bc->sel_changed_connection = sp_desktop_selection(ec->desktop)->connectChanged(
 214         sigc::bind(sigc::ptr_fun(&sp_3dbox_context_selection_changed), (gpointer)bc)
 215     );
 216
 217     if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
 218         ec->enableSelectionCue();
 219     }
 220
 221     if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
 222         ec->enableGrDrag();
 223     }
 224
 225     bc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 226 }
 227
 228 static void sp_3dbox_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 229 {
 230     //SP3DBoxContext *bc = SP_3DBOX_CONTEXT(ec);
 231
 232     /* fixme: Proper error handling for non-numeric data.  Use a locale-independent function like
 233      * g_ascii_strtod (or a thin wrapper that does the right thing for invalid values inf/nan). */
 234     /**
 235     if ( strcmp(key, "rx") == 0 ) {
 236         bc->rx = ( val
 237                          ? g_ascii_strtod (val, NULL)
 238                          : 0.0 );
 239     } else if ( strcmp(key, "ry") == 0 ) {
 240         bc->ry = ( val
 241                          ? g_ascii_strtod (val, NULL)
 242                          : 0.0 );
 243     }
 244     **/
 245 }
 246
 247 static gint sp_3dbox_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 248 {
 249     SPDesktop *desktop = event_context->desktop;
 250
 251     gint ret = FALSE;
 252
 253     switch (event->type) {
 254     case GDK_BUTTON_PRESS:
 255         if ( event->button.button == 1 && !event_context->space_panning) {
 256             Inkscape::setup_for_drag_start(desktop, event_context, event);
 257             ret = TRUE;
 258         }
 259         break;
 260         // motion and release are always on root (why?)
 261     default:
 262         break;
 263     }
 264
 265     if (((SPEventContextClass *) parent_class)->item_handler) {
 266         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 267     }
 268
 269     return ret;
 270 }
 271
 272 static gint sp_3dbox_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 273 {
 274     static bool dragging;
 275
 276     SPDesktop *desktop = event_context->desktop;
 277     Inkscape::Selection *selection = sp_desktop_selection (desktop);
 278
 279     SP3DBoxContext *bc = SP_3DBOX_CONTEXT(event_context);
 280
 281     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 282
 283     gint ret = FALSE;
 284     switch (event->type) {
 285     case GDK_BUTTON_PRESS:
 286         if ( event->button.button == 1  && !event_context->space_panning) {
 287             NR::Point const button_w(event->button.x,
 288                                      event->button.y);
 289
 290             // save drag origin
 291             event_context->xp = (gint) button_w[NR::X];
 292             event_context->yp = (gint) button_w[NR::Y];
 293             event_context->within_tolerance = true;
 294
 295             // remember clicked item, disregarding groups, honoring Alt
 296             event_context->item_to_select = sp_event_context_find_item (desktop, button_w, event->button.state & GDK_MOD1_MASK, event->button.state & GDK_CONTROL_MASK);
 297
 298             dragging = true;
 299
 300             /* Position center */
 301             NR::Point const button_dt(desktop->w2d(button_w));
 302             bc->drag_origin = button_dt;
 303             bc->drag_ptB = button_dt;
 304             bc->drag_ptC = button_dt;
 305
 306             /* Snap center */
 307             SnapManager const &m = desktop->namedview->snap_manager;
 308             bc->center = m.freeSnap(Inkscape::Snapper::SNAPPOINT_NODE | Inkscape::Snapper::SNAPPOINT_BBOX,
 309                                     button_dt, bc->item).getPoint();
 310
 311             sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 312                                 ( GDK_KEY_PRESS_MASK |
 313                                   GDK_BUTTON_RELEASE_MASK       |
 314                                   GDK_POINTER_MOTION_MASK       |
 315                                   GDK_BUTTON_PRESS_MASK ),
 316                                 NULL, event->button.time);
 317             ret = TRUE;
 318         }
 319         break;
 320     case GDK_MOTION_NOTIFY:
 321         if ( dragging
 322              && ( event->motion.state & GDK_BUTTON1_MASK )  && !event_context->space_panning)
 323         {
 324             if ( event_context->within_tolerance
 325                  && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 326                  && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 327                 break; // do not drag if we're within tolerance from origin
 328             }
 329             // Once the user has moved farther than tolerance from the original location
 330             // (indicating they intend to draw, not click), then always process the
 331             // motion notify coordinates as given (no snapping back to origin)
 332             event_context->within_tolerance = false;
 333
 334             NR::Point const motion_w(event->motion.x,
 335                                      event->motion.y);
 336             NR::Point motion_dt(desktop->w2d(motion_w));
 337
 338             SnapManager const &m = desktop->namedview->snap_manager;
 339             motion_dt = m.freeSnap(Inkscape::Snapper::SNAPPOINT_BBOX | Inkscape::Snapper::SNAPPOINT_NODE, motion_dt, bc->item).getPoint();
 340
 341             bc->ctrl_dragged  = event->motion.state & GDK_CONTROL_MASK;
 342
 343             if (event->motion.state & GDK_SHIFT_MASK && !bc->extruded) {
 344                 /* once shift is pressed, set bc->extruded (no need to create further faces;
 345                    all of them are already created in sp_3dbox_init) */
 346                 bc->extruded = true;
 347             }
 348
 349             if (!bc->extruded) {
 350                 bc->drag_ptB = motion_dt;
 351                 bc->drag_ptC = motion_dt;
 352             } else {
 353                 // Without Ctrl, motion of the extruded corner is constrained to the
 354                 // perspective line from drag_ptB to vanishing point Y.
 355                 if (!bc->ctrl_dragged) {
 356                         bc->drag_ptC = Box3D::perspective_line_snap (bc->drag_ptB, Box3D::Z, motion_dt, Box3D::Perspective3D::current_perspective);
 357                 } else {
 358                     bc->drag_ptC = motion_dt;
 359                 }
 360                 bc->drag_ptC = m.freeSnap(Inkscape::Snapper::SNAPPOINT_BBOX | Inkscape::Snapper::SNAPPOINT_NODE, bc->drag_ptC, bc->item).getPoint();
 361                 if (bc->ctrl_dragged) {
 362                         Box3D::PerspectiveLine pl1 (NR::Point (event_context->xp, event_context->yp), Box3D::Y, Box3D::Perspective3D::current_perspective);
 363                         Box3D::PerspectiveLine pl2 (bc->drag_ptB, Box3D::X, Box3D::Perspective3D::current_perspective);
 364                         NR::Point corner1 = pl1.meet(pl2);
 365
 366                         Box3D::PerspectiveLine pl3 (corner1, Box3D::X, Box3D::Perspective3D::current_perspective);
 367                         Box3D::PerspectiveLine pl4 (bc->drag_ptC, Box3D::Z, Box3D::Perspective3D::current_perspective);
 368                         bc->drag_ptB = pl3.meet(pl4);
 369                 }
 370             }
 371
 372
 373             sp_3dbox_drag(*bc, event->motion.state);
 374
 375             ret = TRUE;
 376         }
 377         break;
 378     case GDK_BUTTON_RELEASE:
 379         event_context->xp = event_context->yp = 0;
 380         if ( event->button.button == 1  && !event_context->space_panning) {
 381             dragging = false;
 382
 383             if (!event_context->within_tolerance) {
 384                 // we've been dragging, finish the box
 385                 sp_3dbox_finish(bc);
 386             } else if (event_context->item_to_select) {
 387                 // no dragging, select clicked item if any
 388                 if (event->button.state & GDK_SHIFT_MASK) {
 389                     selection->toggle(event_context->item_to_select);
 390                 } else {
 391                     selection->set(event_context->item_to_select);
 392                 }
 393             } else {
 394                 // click in an empty space
 395                 selection->clear();
 396             }
 397
 398             event_context->item_to_select = NULL;
 399             ret = TRUE;
 400             sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
 401                                   event->button.time);
 402         }
 403         break;
 404     case GDK_KEY_PRESS:
 405         switch (get_group0_keyval (&event->key)) {
 406         case GDK_Alt_L:
 407         case GDK_Alt_R:
 408         case GDK_Control_L:
 409         case GDK_Control_R:
 410         case GDK_Shift_L:
 411         case GDK_Shift_R:
 412         case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 413         case GDK_Meta_R:
 414             /***
 415             if (!dragging){
 416                 sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
 417                                             _("<b>Ctrl</b>: make square or integer-ratio rect, lock a rounded corner circular"),
 418                                             _("<b>Shift</b>: draw around the starting point"),
 419                                             NULL);
 420             }
 421             ***/
 422             break;
 423         case GDK_Up:
 424         case GDK_Down:
 425         case GDK_KP_Up:
 426         case GDK_KP_Down:
 427             // prevent the zoom field from activation
 428             if (!MOD__CTRL_ONLY)
 429                 ret = TRUE;
 430             break;
 431
 432         case GDK_x:
 433         case GDK_X:
 434             if (MOD__ALT_ONLY) {
 435                 // desktop->setToolboxFocusTo ("altx-rect");
 436                 ret = TRUE;
 437             }
 438             break;
 439
 440         case GDK_Escape:
 441             sp_desktop_selection(desktop)->clear();
 442             //TODO: make dragging escapable by Esc
 443             break;
 444
 445         case GDK_space:
 446             if (dragging) {
 447                 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
 448                                       event->button.time);
 449                 dragging = false;
 450                 if (!event_context->within_tolerance) {
 451                     // we've been dragging, finish the box
 452                     sp_3dbox_finish(bc);
 453                 }
 454                 // do not return true, so that space would work switching to selector
 455             }
 456             break;
 457
 458         default:
 459             break;
 460         }
 461         break;
 462     case GDK_KEY_RELEASE:
 463         switch (get_group0_keyval (&event->key)) {
 464         case GDK_Alt_L:
 465         case GDK_Alt_R:
 466         case GDK_Control_L:
 467         case GDK_Control_R:
 468         case GDK_Shift_L:
 469         case GDK_Shift_R:
 470         case GDK_Meta_L:  // Meta is when you press Shift+Alt
 471         case GDK_Meta_R:
 472             event_context->defaultMessageContext()->clear();
 473             break;
 474         default:
 475             break;
 476         }
 477         break;
 478     default:
 479         break;
 480     }
 481
 482     if (!ret) {
 483         if (((SPEventContextClass *) parent_class)->root_handler) {
 484             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 485         }
 486     }
 487
 488     return ret;
 489 }
 490
 491 static void sp_3dbox_drag(SP3DBoxContext &bc, guint state)
 492 {
 493     SPDesktop *desktop = SP_EVENT_CONTEXT(&bc)->desktop;
 494
 495     if (!bc.item) {
 496
 497         if (Inkscape::have_viable_layer(desktop, bc._message_context) == false) {
 498             return;
 499         }
 500
 501         /* Create object */
 502         Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_EVENT_CONTEXT_DOCUMENT(&bc));
 503         Inkscape::XML::Node *repr = xml_doc->createElement("svg:g");
 504         repr->setAttribute("sodipodi:type", "inkscape:3dbox");
 505
 506         /* Set style */
 507         sp_desktop_apply_style_tool (desktop, repr, "tools.shapes.3dbox", false);
 508
 509         bc.item = (SPItem *) desktop->currentLayer()->appendChildRepr(repr);
 510         Inkscape::GC::release(repr);
 511         bc.item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 512
 513         /* Hook paths to the faces of the box */
 514         for (int i = 0; i < 6; ++i) {
 515             SP_3DBOX(bc.item)->faces[i]->hook_path_to_3dbox();
 516         }
 517
 518         bc.item->updateRepr();
 519
 520         sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 521     }
 522
 523     // FIXME: remove these extra points
 524     NR::Point pt = bc.drag_ptB;
 525     NR::Point shift_pt = bc.drag_ptC;
 526
 527     NR::Rect r;
 528     if (!(state & GDK_SHIFT_MASK)) {
 529         r = Inkscape::snap_rectangular_box(desktop, bc.item, pt, bc.center, state);
 530     } else {
 531         r = Inkscape::snap_rectangular_box(desktop, bc.item, shift_pt, bc.center, state);
 532     }
 533
 534     SPEventContext *ec = SP_EVENT_CONTEXT(&bc);
 535     NR::Point origin_w(ec->xp, ec->yp);
 536     NR::Point origin(desktop->w2d(origin_w));
 537     sp_3dbox_position_set(bc);
 538
 539     // status text
 540     //GString *Ax = SP_PX_TO_METRIC_STRING(origin[NR::X], desktop->namedview->getDefaultMetric());
 541     //GString *Ay = SP_PX_TO_METRIC_STRING(origin[NR::Y], desktop->namedview->getDefaultMetric());
 542     bc._message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>3D Box</b>; with <b>Shift</b> to extrude along the Z axis"));
 543     //g_string_free(Ax, FALSE);
 544     //g_string_free(Ay, FALSE);
 545 }
 546
 547 static void sp_3dbox_finish(SP3DBoxContext *bc)
 548 {
 549     bc->_message_context->clear();
 550
 551     if ( bc->item != NULL ) {
 552         SPDesktop * desktop;
 553
 554         desktop = SP_EVENT_CONTEXT_DESKTOP(bc);
 555
 556         SP_OBJECT(bc->item)->updateRepr();
 557         sp_3dbox_set_ratios(SP_3DBOX(bc->item));
 558
 559         sp_canvas_end_forced_full_redraws(desktop->canvas);
 560
 561         sp_desktop_selection(desktop)->set(bc->item);
 562         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_3DBOX,
 563                          _("Create 3D box"));
 564
 565         bc->item = NULL;
 566     }
 567
 568     bc->ctrl_dragged = false;
 569     bc->extruded = false;
 570 }
 571
 572 /*
 573   Local Variables:
 574   mode:c++
 575   c-file-style:"stroustrup"
 576   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 577   indent-tabs-mode:nil
 578   fill-column:99
 579   End:
 580 */
 581 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :