src/rect-context.cpp

   1 #define __SP_RECT_CONTEXT_C__
   2
   3 /*
   4  * Rectangle drawing context
   5  *
   6  * Author:
   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) 2000-2005 authors
  12  * Copyright (C) 2000-2001 Ximian, Inc.
  13  *
  14  * Released under GNU GPL, read the file 'COPYING' for more information
  15  */
  16
  17 #include "config.h"
  18
  19 #include <gdk/gdkkeysyms.h>
  20 #include <cstring>
  21 #include <string>
  22
  23 #include "macros.h"
  24 #include "display/sp-canvas.h"
  25 #include "sp-rect.h"
  26 #include "document.h"
  27 #include "sp-namedview.h"
  28 #include "selection.h"
  29 #include "selection-chemistry.h"
  30 #include "desktop-handles.h"
  31 #include "snap.h"
  32 #include "desktop.h"
  33 #include "desktop-style.h"
  34 #include "message-context.h"
  35 #include "pixmaps/cursor-rect.xpm"
  36 #include "rect-context.h"
  37 #include "sp-metrics.h"
  38 #include <glibmm/i18n.h>
  39 #include "object-edit.h"
  40 #include "xml/repr.h"
  41 #include "xml/node-event-vector.h"
  42 #include "preferences.h"
  43 #include "context-fns.h"
  44 #include "shape-editor.h"
  45
  46 //static const double goldenratio = 1.61803398874989484820; // golden ratio
  47
  48 static void sp_rect_context_class_init(SPRectContextClass *klass);
  49 static void sp_rect_context_init(SPRectContext *rect_context);
  50 static void sp_rect_context_dispose(GObject *object);
  51
  52 static void sp_rect_context_setup(SPEventContext *ec);
  53 static void sp_rect_context_finish(SPEventContext *ec);
  54 static void sp_rect_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val);
  55
  56 static gint sp_rect_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  57 static gint sp_rect_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  58
  59 static void sp_rect_drag(SPRectContext &rc, Geom::Point const pt, guint state);
  60 static void sp_rect_finish(SPRectContext *rc);
  61 static void sp_rect_cancel(SPRectContext *rc);
  62
  63 static SPEventContextClass *parent_class;
  64
  65
  66 GtkType sp_rect_context_get_type()
  67 {
  68     static GType type = 0;
  69     if (!type) {
  70         GTypeInfo info = {
  71             sizeof(SPRectContextClass),
  72             NULL, NULL,
  73             (GClassInitFunc) sp_rect_context_class_init,
  74             NULL, NULL,
  75             sizeof(SPRectContext),
  76             4,
  77             (GInstanceInitFunc) sp_rect_context_init,
  78             NULL,    /* value_table */
  79         };
  80         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPRectContext", &info, (GTypeFlags) 0);
  81     }
  82     return type;
  83 }
  84
  85 static void sp_rect_context_class_init(SPRectContextClass *klass)
  86 {
  87     GObjectClass *object_class = (GObjectClass *) klass;
  88     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  89
  90     parent_class = (SPEventContextClass *) g_type_class_peek_parent(klass);
  91
  92     object_class->dispose = sp_rect_context_dispose;
  93
  94     event_context_class->setup = sp_rect_context_setup;
  95     event_context_class->finish = sp_rect_context_finish;
  96     event_context_class->set = sp_rect_context_set;
  97     event_context_class->root_handler  = sp_rect_context_root_handler;
  98     event_context_class->item_handler  = sp_rect_context_item_handler;
  99 }
 100
 101 static void sp_rect_context_init(SPRectContext *rect_context)
 102 {
 103     SPEventContext *event_context = SP_EVENT_CONTEXT(rect_context);
 104
 105     event_context->cursor_shape = cursor_rect_xpm;
 106     event_context->hot_x = 4;
 107     event_context->hot_y = 4;
 108     event_context->xp = 0;
 109     event_context->yp = 0;
 110     event_context->tolerance = 0;
 111     event_context->within_tolerance = false;
 112     event_context->item_to_select = NULL;
 113     event_context->tool_url = "/tools/shapes/rect";
 114
 115     rect_context->item = NULL;
 116
 117     rect_context->rx = 0.0;
 118     rect_context->ry = 0.0;
 119
 120     new (&rect_context->sel_changed_connection) sigc::connection();
 121 }
 122
 123 static void sp_rect_context_finish(SPEventContext *ec)
 124 {
 125     SPRectContext *rc = SP_RECT_CONTEXT(ec);
 126     SPDesktop *desktop = ec->desktop;
 127
 128     sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), GDK_CURRENT_TIME);
 129     sp_rect_finish(rc);
 130     rc->sel_changed_connection.disconnect();
 131
 132     if (((SPEventContextClass *) parent_class)->finish) {
 133         ((SPEventContextClass *) parent_class)->finish(ec);
 134     }
 135 }
 136
 137
 138 static void sp_rect_context_dispose(GObject *object)
 139 {
 140     SPRectContext *rc = SP_RECT_CONTEXT(object);
 141     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 142
 143     ec->enableGrDrag(false);
 144
 145     rc->sel_changed_connection.disconnect();
 146     rc->sel_changed_connection.~connection();
 147
 148     delete ec->shape_editor;
 149     ec->shape_editor = NULL;
 150
 151     /* fixme: This is necessary because we do not grab */
 152     if (rc->item) {
 153         sp_rect_finish(rc);
 154     }
 155
 156     if (rc->_message_context) {
 157         delete rc->_message_context;
 158     }
 159
 160     G_OBJECT_CLASS(parent_class)->dispose(object);
 161 }
 162
 163 /**
 164 \brief  Callback that processes the "changed" signal on the selection;
 165 destroys old and creates new knotholder
 166 */
 167 void sp_rect_context_selection_changed(Inkscape::Selection *selection, gpointer data)
 168 {
 169     SPRectContext *rc = SP_RECT_CONTEXT(data);
 170     SPEventContext *ec = SP_EVENT_CONTEXT(rc);
 171
 172     ec->shape_editor->unset_item(SH_KNOTHOLDER);
 173     SPItem *item = selection->singleItem();
 174     ec->shape_editor->set_item(item, SH_KNOTHOLDER);
 175 }
 176
 177 static void sp_rect_context_setup(SPEventContext *ec)
 178 {
 179     SPRectContext *rc = SP_RECT_CONTEXT(ec);
 180
 181     if (((SPEventContextClass *) parent_class)->setup) {
 182         ((SPEventContextClass *) parent_class)->setup(ec);
 183     }
 184
 185     ec->shape_editor = new ShapeEditor(ec->desktop);
 186
 187     SPItem *item = sp_desktop_selection(ec->desktop)->singleItem();
 188     if (item) {
 189         ec->shape_editor->set_item(item, SH_KNOTHOLDER);
 190     }
 191
 192     rc->sel_changed_connection.disconnect();
 193     rc->sel_changed_connection = sp_desktop_selection(ec->desktop)->connectChanged(
 194         sigc::bind(sigc::ptr_fun(&sp_rect_context_selection_changed), (gpointer)rc)
 195     );
 196
 197     sp_event_context_read(ec, "rx");
 198     sp_event_context_read(ec, "ry");
 199
 200     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 201     if (prefs->getBool("/tools/shapes/selcue")) {
 202         ec->enableSelectionCue();
 203     }
 204
 205     if (prefs->getBool("/tools/shapes/gradientdrag")) {
 206         ec->enableGrDrag();
 207     }
 208
 209     rc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 210 }
 211
 212 static void sp_rect_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val)
 213 {
 214     SPRectContext *rc = SP_RECT_CONTEXT(ec);
 215
 216     /* fixme: Proper error handling for non-numeric data.  Use a locale-independent function like
 217      * g_ascii_strtod (or a thin wrapper that does the right thing for invalid values inf/nan). */
 218     Glib::ustring name = val->getEntryName();
 219     if ( name == "rx" ) {
 220         rc->rx = val->getDoubleLimited(); // prevents NaN and +/-Inf from messing up
 221     } else if ( name == "ry" ) {
 222         rc->ry = val->getDoubleLimited();
 223     }
 224 }
 225
 226 static gint sp_rect_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 227 {
 228     SPDesktop *desktop = event_context->desktop;
 229
 230     gint ret = FALSE;
 231
 232     switch (event->type) {
 233     case GDK_BUTTON_PRESS:
 234         if ( event->button.button == 1 && !event_context->space_panning) {
 235             Inkscape::setup_for_drag_start(desktop, event_context, event);
 236             ret = TRUE;
 237         }
 238         break;
 239         // motion and release are always on root (why?)
 240     default:
 241         break;
 242     }
 243
 244     if (((SPEventContextClass *) parent_class)->item_handler) {
 245         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 246     }
 247
 248     return ret;
 249 }
 250
 251 static gint sp_rect_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 252 {
 253     static bool dragging;
 254
 255     SPDesktop *desktop = event_context->desktop;
 256     Inkscape::Selection *selection = sp_desktop_selection (desktop);
 257
 258     SPRectContext *rc = SP_RECT_CONTEXT(event_context);
 259     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 260
 261     event_context->tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 262
 263     gint ret = FALSE;
 264     switch (event->type) {
 265     case GDK_BUTTON_PRESS:
 266         if (event->button.button == 1 && !event_context->space_panning) {
 267             Geom::Point const button_w(event->button.x,
 268                                      event->button.y);
 269
 270             // save drag origin
 271             event_context->xp = (gint) button_w[Geom::X];
 272             event_context->yp = (gint) button_w[Geom::Y];
 273             event_context->within_tolerance = true;
 274
 275             // remember clicked item, disregarding groups, honoring Alt
 276             event_context->item_to_select = sp_event_context_find_item (desktop, button_w, event->button.state & GDK_MOD1_MASK, TRUE);
 277
 278             dragging = true;
 279
 280             /* Position center */
 281             Geom::Point button_dt(desktop->w2d(button_w));
 282             rc->center = from_2geom(button_dt);
 283
 284             /* Snap center */
 285             SnapManager &m = desktop->namedview->snap_manager;
 286             m.setup(desktop);
 287             m.freeSnapReturnByRef(button_dt, Inkscape::SNAPSOURCE_NODE_HANDLE);
 288             m.unSetup();
 289             rc->center = from_2geom(button_dt);
 290
 291             sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 292                                 ( GDK_KEY_PRESS_MASK |
 293                                   GDK_BUTTON_RELEASE_MASK       |
 294                                   GDK_POINTER_MOTION_MASK       |
 295                                   GDK_POINTER_MOTION_HINT_MASK       |
 296                                   GDK_BUTTON_PRESS_MASK ),
 297                                 NULL, event->button.time);
 298
 299             ret = TRUE;
 300         }
 301         break;
 302     case GDK_MOTION_NOTIFY:
 303         if ( dragging
 304              && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning)
 305         {
 306             if ( event_context->within_tolerance
 307                  && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 308                  && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 309                 break; // do not drag if we're within tolerance from origin
 310             }
 311             // Once the user has moved farther than tolerance from the original location
 312             // (indicating they intend to draw, not click), then always process the
 313             // motion notify coordinates as given (no snapping back to origin)
 314             event_context->within_tolerance = false;
 315
 316             Geom::Point const motion_w(event->motion.x, event->motion.y);
 317             Geom::Point motion_dt(desktop->w2d(motion_w));
 318
 319             sp_rect_drag(*rc, motion_dt, event->motion.state); // this will also handle the snapping
 320             gobble_motion_events(GDK_BUTTON1_MASK);
 321             ret = TRUE;
 322         } else if (!sp_event_context_knot_mouseover(rc)) {
 323             SnapManager &m = desktop->namedview->snap_manager;
 324             m.setup(desktop);
 325
 326             Geom::Point const motion_w(event->motion.x, event->motion.y);
 327             Geom::Point motion_dt(desktop->w2d(motion_w));
 328
 329             m.preSnap(Inkscape::SnapCandidatePoint(motion_dt, Inkscape::SNAPSOURCE_NODE_HANDLE));
 330             m.unSetup();
 331         }
 332         break;
 333     case GDK_BUTTON_RELEASE:
 334         event_context->xp = event_context->yp = 0;
 335         if (event->button.button == 1 && !event_context->space_panning) {
 336             dragging = false;
 337             sp_event_context_discard_delayed_snap_event(event_context);
 338
 339             if (!event_context->within_tolerance) {
 340                 // we've been dragging, finish the rect
 341                 sp_rect_finish(rc);
 342             } else if (event_context->item_to_select) {
 343                 // no dragging, select clicked item if any
 344                 if (event->button.state & GDK_SHIFT_MASK) {
 345                     selection->toggle(event_context->item_to_select);
 346                 } else {
 347                     selection->set(event_context->item_to_select);
 348                 }
 349             } else {
 350                 // click in an empty space
 351                 selection->clear();
 352             }
 353
 354             event_context->item_to_select = NULL;
 355             ret = TRUE;
 356             sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
 357                                   event->button.time);
 358         }
 359         break;
 360     case GDK_KEY_PRESS:
 361         switch (get_group0_keyval (&event->key)) {
 362         case GDK_Alt_L:
 363         case GDK_Alt_R:
 364         case GDK_Control_L:
 365         case GDK_Control_R:
 366         case GDK_Shift_L:
 367         case GDK_Shift_R:
 368         case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 369         case GDK_Meta_R:
 370             if (!dragging){
 371                 sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
 372                                             _("<b>Ctrl</b>: make square or integer-ratio rect, lock a rounded corner circular"),
 373                                             _("<b>Shift</b>: draw around the starting point"),
 374                                             NULL);
 375             }
 376             break;
 377         case GDK_Up:
 378         case GDK_Down:
 379         case GDK_KP_Up:
 380         case GDK_KP_Down:
 381             // prevent the zoom field from activation
 382             if (!MOD__CTRL_ONLY)
 383                 ret = TRUE;
 384             break;
 385
 386         case GDK_x:
 387         case GDK_X:
 388             if (MOD__ALT_ONLY) {
 389                 desktop->setToolboxFocusTo ("altx-rect");
 390                 ret = TRUE;
 391             }
 392             break;
 393
 394         case GDK_g:
 395         case GDK_G:
 396             if (MOD__SHIFT_ONLY) {
 397                 sp_selection_to_guides(desktop);
 398                 ret = true;
 399             }
 400             break;
 401
 402         case GDK_Escape:
 403             if (dragging) {
 404                 dragging = false;
 405                 sp_event_context_discard_delayed_snap_event(event_context);
 406                 // if drawing, cancel, otherwise pass it up for deselecting
 407                 sp_rect_cancel(rc);
 408                 ret = TRUE;
 409             }
 410             break;
 411
 412         case GDK_space:
 413             if (dragging) {
 414                 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
 415                                       event->button.time);
 416                 dragging = false;
 417                 sp_event_context_discard_delayed_snap_event(event_context);
 418                 if (!event_context->within_tolerance) {
 419                     // we've been dragging, finish the rect
 420                     sp_rect_finish(rc);
 421                 }
 422                 // do not return true, so that space would work switching to selector
 423             }
 424             break;
 425
 426         default:
 427             break;
 428         }
 429         break;
 430     case GDK_KEY_RELEASE:
 431         switch (get_group0_keyval (&event->key)) {
 432         case GDK_Alt_L:
 433         case GDK_Alt_R:
 434         case GDK_Control_L:
 435         case GDK_Control_R:
 436         case GDK_Shift_L:
 437         case GDK_Shift_R:
 438         case GDK_Meta_L:  // Meta is when you press Shift+Alt
 439         case GDK_Meta_R:
 440             event_context->defaultMessageContext()->clear();
 441             break;
 442         default:
 443             break;
 444         }
 445         break;
 446     default:
 447         break;
 448     }
 449
 450     if (!ret) {
 451         if (((SPEventContextClass *) parent_class)->root_handler) {
 452             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 453         }
 454     }
 455
 456     return ret;
 457 }
 458
 459 static void sp_rect_drag(SPRectContext &rc, Geom::Point const pt, guint state)
 460 {
 461     SPDesktop *desktop = SP_EVENT_CONTEXT(&rc)->desktop;
 462
 463     if (!rc.item) {
 464
 465         if (Inkscape::have_viable_layer(desktop, rc._message_context) == false) {
 466             return;
 467         }
 468
 469         /* Create object */
 470         Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_EVENT_CONTEXT_DOCUMENT(&rc));
 471         Inkscape::XML::Node *repr = xml_doc->createElement("svg:rect");
 472
 473         /* Set style */
 474         sp_desktop_apply_style_tool (desktop, repr, "/tools/shapes/rect", false);
 475
 476         rc.item = (SPItem *) desktop->currentLayer()->appendChildRepr(repr);
 477         Inkscape::GC::release(repr);
 478         rc.item->transform = sp_item_i2doc_affine(SP_ITEM(desktop->currentLayer())).inverse();
 479         rc.item->updateRepr();
 480
 481         sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 482     }
 483
 484     Geom::Rect const r = Inkscape::snap_rectangular_box(desktop, rc.item, pt, rc.center, state);
 485
 486     sp_rect_position_set(SP_RECT(rc.item), r.min()[Geom::X], r.min()[Geom::Y], r.dimensions()[Geom::X], r.dimensions()[Geom::Y]);
 487     if ( rc.rx != 0.0 ) {
 488         sp_rect_set_rx (SP_RECT(rc.item), TRUE, rc.rx);
 489     }
 490     if ( rc.ry != 0.0 ) {
 491         if (rc.rx == 0.0)
 492             sp_rect_set_ry (SP_RECT(rc.item), TRUE, CLAMP(rc.ry, 0, MIN(r.dimensions()[Geom::X], r.dimensions()[Geom::Y])/2));
 493         else
 494             sp_rect_set_ry (SP_RECT(rc.item), TRUE, CLAMP(rc.ry, 0, r.dimensions()[Geom::Y]));
 495     }
 496
 497     // status text
 498     double rdimx = r.dimensions()[Geom::X];
 499     double rdimy = r.dimensions()[Geom::Y];
 500     GString *xs = SP_PX_TO_METRIC_STRING(rdimx, desktop->namedview->getDefaultMetric());
 501     GString *ys = SP_PX_TO_METRIC_STRING(rdimy, desktop->namedview->getDefaultMetric());
 502     if (state & GDK_CONTROL_MASK) {
 503         int ratio_x, ratio_y;
 504         bool is_golden_ratio = false;
 505         if (fabs (rdimx) > fabs (rdimy)) {
 506             if (fabs(rdimx / rdimy - goldenratio) < 1e-6) {
 507                 is_golden_ratio = true;
 508             }
 509             ratio_x = (int) rint (rdimx / rdimy);
 510             ratio_y = 1;
 511         } else {
 512             if (fabs(rdimy / rdimx - goldenratio) < 1e-6) {
 513                 is_golden_ratio = true;
 514             }
 515             ratio_x = 1;
 516             ratio_y = (int) rint (rdimy / rdimx);
 517         }
 518         if (!is_golden_ratio) {
 519             rc._message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>Rectangle</b>: %s &#215; %s (constrained to ratio %d:%d); with <b>Shift</b> to draw around the starting point"), xs->str, ys->str, ratio_x, ratio_y);
 520         } else {
 521             if (ratio_y == 1) {
 522                 rc._message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>Rectangle</b>: %s &#215; %s (constrained to golden ratio 1.618 : 1); with <b>Shift</b> to draw around the starting point"), xs->str, ys->str);
 523             } else {
 524                 rc._message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>Rectangle</b>: %s &#215; %s (constrained to golden ratio 1 : 1.618); with <b>Shift</b> to draw around the starting point"), xs->str, ys->str);
 525             }
 526         }
 527     } else {
 528         rc._message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>Rectangle</b>: %s &#215; %s; with <b>Ctrl</b> to make square or integer-ratio rectangle; with <b>Shift</b> to draw around the starting point"), xs->str, ys->str);
 529     }
 530     g_string_free(xs, FALSE);
 531     g_string_free(ys, FALSE);
 532 }
 533
 534 static void sp_rect_finish(SPRectContext *rc)
 535 {
 536     rc->_message_context->clear();
 537
 538     if ( rc->item != NULL ) {
 539         SPRect *rect = SP_RECT(rc->item);
 540         if (rect->width.computed == 0 || rect->height.computed == 0) {
 541             sp_rect_cancel(rc); // Don't allow the creating of zero sized rectangle, for example when the start and and point snap to the snap grid point
 542             return;
 543         }
 544
 545         SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(rc);
 546
 547         SP_OBJECT(rc->item)->updateRepr();
 548
 549         sp_canvas_end_forced_full_redraws(desktop->canvas);
 550
 551         sp_desktop_selection(desktop)->set(rc->item);
 552         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_RECT,
 553                          _("Create rectangle"));
 554
 555         rc->item = NULL;
 556     }
 557 }
 558
 559 static void sp_rect_cancel(SPRectContext *rc)
 560 {
 561     SPDesktop *desktop = SP_EVENT_CONTEXT(rc)->desktop;
 562
 563     sp_desktop_selection(desktop)->clear();
 564     sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
 565
 566     if (rc->item != NULL) {
 567         SP_OBJECT(rc->item)->deleteObject();
 568         rc->item = NULL;
 569     }
 570
 571     rc->within_tolerance = false;
 572     rc->xp = 0;
 573     rc->yp = 0;
 574     rc->item_to_select = NULL;
 575
 576     sp_canvas_end_forced_full_redraws(desktop->canvas);
 577
 578     sp_document_cancel(sp_desktop_document(desktop));
 579 }
 580
 581
 582 /*
 583   Local Variables:
 584   mode:c++
 585   c-file-style:"stroustrup"
 586   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 587   indent-tabs-mode:nil
 588   fill-column:99
 589   End:
 590 */
 591 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :