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 #include "inkscape.h"
  19
  20 #include <gdk/gdkkeysyms.h>
  21
  22 #include "macros.h"
  23 #include "display/sp-canvas.h"
  24 #include "sp-rect.h"
  25 #include "document.h"
  26 #include "sp-namedview.h"
  27 #include "selection.h"
  28 #include "desktop-handles.h"
  29 #include "snap.h"
  30 #include "desktop.h"
  31 #include "desktop-style.h"
  32 #include "message-context.h"
  33 #include "pixmaps/cursor-rect.xpm"
  34 #include "rect-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 const double goldenratio = 1.61803398874989484820; // golden ratio
  44
  45 static void sp_rect_context_class_init(SPRectContextClass *klass);
  46 static void sp_rect_context_init(SPRectContext *rect_context);
  47 static void sp_rect_context_dispose(GObject *object);
  48
  49 static void sp_rect_context_setup(SPEventContext *ec);
  50 static void sp_rect_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  51
  52 static gint sp_rect_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  53 static gint sp_rect_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  54
  55 static void sp_rect_drag(SPRectContext &rc, NR::Point const pt, guint state);
  56 static void sp_rect_finish(SPRectContext *rc);
  57
  58 static SPEventContextClass *parent_class;
  59
  60
  61 GtkType sp_rect_context_get_type()
  62 {
  63     static GType type = 0;
  64     if (!type) {
  65         GTypeInfo info = {
  66             sizeof(SPRectContextClass),
  67             NULL, NULL,
  68             (GClassInitFunc) sp_rect_context_class_init,
  69             NULL, NULL,
  70             sizeof(SPRectContext),
  71             4,
  72             (GInstanceInitFunc) sp_rect_context_init,
  73             NULL,    /* value_table */
  74         };
  75         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPRectContext", &info, (GTypeFlags) 0);
  76     }
  77     return type;
  78 }
  79
  80 static void sp_rect_context_class_init(SPRectContextClass *klass)
  81 {
  82     GObjectClass *object_class = (GObjectClass *) klass;
  83     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  84
  85     parent_class = (SPEventContextClass *) g_type_class_peek_parent(klass);
  86
  87     object_class->dispose = sp_rect_context_dispose;
  88
  89     event_context_class->setup = sp_rect_context_setup;
  90     event_context_class->set = sp_rect_context_set;
  91     event_context_class->root_handler  = sp_rect_context_root_handler;
  92     event_context_class->item_handler  = sp_rect_context_item_handler;
  93 }
  94
  95 static void sp_rect_context_init(SPRectContext *rect_context)
  96 {
  97     SPEventContext *event_context = SP_EVENT_CONTEXT(rect_context);
  98
  99     event_context->cursor_shape = cursor_rect_xpm;
 100     event_context->hot_x = 4;
 101     event_context->hot_y = 4;
 102     event_context->xp = 0;
 103     event_context->yp = 0;
 104     event_context->tolerance = 0;
 105     event_context->within_tolerance = false;
 106     event_context->item_to_select = NULL;
 107
 108     event_context->shape_repr = NULL;
 109     event_context->shape_knot_holder = NULL;
 110
 111     rect_context->item = NULL;
 112
 113     rect_context->rx = 0.0;
 114     rect_context->ry = 0.0;
 115
 116     new (&rect_context->sel_changed_connection) sigc::connection();
 117 }
 118
 119 static void sp_rect_context_dispose(GObject *object)
 120 {
 121     SPRectContext *rc = SP_RECT_CONTEXT(object);
 122     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 123
 124     ec->enableGrDrag(false);
 125
 126     rc->sel_changed_connection.disconnect();
 127     rc->sel_changed_connection.~connection();
 128
 129     /* fixme: This is necessary because we do not grab */
 130     if (rc->item) {
 131         sp_rect_finish(rc);
 132     }
 133
 134     if (ec->shape_knot_holder) {
 135         sp_knot_holder_destroy(ec->shape_knot_holder);
 136         ec->shape_knot_holder = NULL;
 137     }
 138
 139     if (ec->shape_repr) { // remove old listener
 140         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 141         Inkscape::GC::release(ec->shape_repr);
 142         ec->shape_repr = 0;
 143     }
 144
 145     if (rc->_message_context) {
 146         delete rc->_message_context;
 147     }
 148
 149     G_OBJECT_CLASS(parent_class)->dispose(object);
 150 }
 151
 152 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
 153     NULL, /* child_added */
 154     NULL, /* child_removed */
 155     ec_shape_event_attr_changed,
 156     NULL, /* content_changed */
 157     NULL  /* order_changed */
 158 };
 159
 160 /**
 161 \brief  Callback that processes the "changed" signal on the selection;
 162 destroys old and creates new knotholder
 163 */
 164 void sp_rect_context_selection_changed(Inkscape::Selection *selection, gpointer data)
 165 {
 166     SPRectContext *rc = SP_RECT_CONTEXT(data);
 167     SPEventContext *ec = SP_EVENT_CONTEXT(rc);
 168
 169     if (ec->shape_knot_holder) { // destroy knotholder
 170         sp_knot_holder_destroy(ec->shape_knot_holder);
 171         ec->shape_knot_holder = NULL;
 172     }
 173
 174     if (ec->shape_repr) { // remove old listener
 175         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 176         Inkscape::GC::release(ec->shape_repr);
 177         ec->shape_repr = 0;
 178     }
 179
 180     SPItem *item = selection->singleItem();
 181     if (item) {
 182         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 183         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 184         if (shape_repr) {
 185             ec->shape_repr = shape_repr;
 186             Inkscape::GC::anchor(shape_repr);
 187             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 188         }
 189     }
 190 }
 191
 192 static void sp_rect_context_setup(SPEventContext *ec)
 193 {
 194     SPRectContext *rc = SP_RECT_CONTEXT(ec);
 195
 196     if (((SPEventContextClass *) parent_class)->setup) {
 197         ((SPEventContextClass *) parent_class)->setup(ec);
 198     }
 199
 200     SPItem *item = sp_desktop_selection(ec->desktop)->singleItem();
 201     if (item) {
 202         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 203         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 204         if (shape_repr) {
 205             ec->shape_repr = shape_repr;
 206             Inkscape::GC::anchor(shape_repr);
 207             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 208         }
 209     }
 210
 211     rc->sel_changed_connection.disconnect();
 212     rc->sel_changed_connection = sp_desktop_selection(ec->desktop)->connectChanged(
 213         sigc::bind(sigc::ptr_fun(&sp_rect_context_selection_changed), (gpointer)rc)
 214     );
 215
 216     sp_event_context_read(ec, "rx");
 217     sp_event_context_read(ec, "ry");
 218
 219     if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
 220         ec->enableSelectionCue();
 221     }
 222
 223     if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
 224         ec->enableGrDrag();
 225     }
 226
 227     rc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 228 }
 229
 230 static void sp_rect_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 231 {
 232     SPRectContext *rc = SP_RECT_CONTEXT(ec);
 233
 234     /* fixme: Proper error handling for non-numeric data.  Use a locale-independent function like
 235      * g_ascii_strtod (or a thin wrapper that does the right thing for invalid values inf/nan). */
 236     if ( strcmp(key, "rx") == 0 ) {
 237         rc->rx = ( val
 238                          ? g_ascii_strtod (val, NULL)
 239                          : 0.0 );
 240     } else if ( strcmp(key, "ry") == 0 ) {
 241         rc->ry = ( val
 242                          ? g_ascii_strtod (val, NULL)
 243                          : 0.0 );
 244     }
 245 }
 246
 247 static gint sp_rect_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_rect_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     SPRectContext *rc = SP_RECT_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, TRUE);
 297
 298             dragging = true;
 299
 300             /* Position center */
 301             NR::Point const button_dt(desktop->w2d(button_w));
 302
 303             /* Snap center */
 304             SnapManager const &m = desktop->namedview->snap_manager;
 305             rc->center = m.freeSnap(Inkscape::Snapper::SNAPPOINT_NODE,
 306                                     button_dt, rc->item).getPoint();
 307
 308             sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 309                                 ( GDK_KEY_PRESS_MASK |
 310                                   GDK_BUTTON_RELEASE_MASK       |
 311                                   GDK_POINTER_MOTION_MASK       |
 312                                   GDK_BUTTON_PRESS_MASK ),
 313                                 NULL, event->button.time);
 314             ret = TRUE;
 315         }
 316         break;
 317     case GDK_MOTION_NOTIFY:
 318         if ( dragging
 319              && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning)
 320         {
 321             if ( event_context->within_tolerance
 322                  && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 323                  && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 324                 break; // do not drag if we're within tolerance from origin
 325             }
 326             // Once the user has moved farther than tolerance from the original location
 327             // (indicating they intend to draw, not click), then always process the
 328             // motion notify coordinates as given (no snapping back to origin)
 329             event_context->within_tolerance = false;
 330
 331             NR::Point const motion_w(event->motion.x,
 332                                      event->motion.y);
 333             NR::Point motion_dt(desktop->w2d(motion_w));
 334
 335             SnapManager const &m = desktop->namedview->snap_manager;
 336             motion_dt = m.freeSnap(Inkscape::Snapper::SNAPPOINT_NODE, motion_dt, rc->item).getPoint();
 337
 338             sp_rect_drag(*rc, motion_dt, event->motion.state);
 339             gobble_motion_events(GDK_BUTTON1_MASK);
 340             ret = TRUE;
 341         }
 342         break;
 343     case GDK_BUTTON_RELEASE:
 344         event_context->xp = event_context->yp = 0;
 345         if (event->button.button == 1 && !event_context->space_panning) {
 346             dragging = false;
 347
 348             if (!event_context->within_tolerance) {
 349                 // we've been dragging, finish the rect
 350                 sp_rect_finish(rc);
 351             } else if (event_context->item_to_select) {
 352                 // no dragging, select clicked item if any
 353                 if (event->button.state & GDK_SHIFT_MASK) {
 354                     selection->toggle(event_context->item_to_select);
 355                 } else {
 356                     selection->set(event_context->item_to_select);
 357                 }
 358             } else {
 359                 // click in an empty space
 360                 selection->clear();
 361             }
 362
 363             event_context->item_to_select = NULL;
 364             ret = TRUE;
 365             sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
 366                                   event->button.time);
 367         }
 368         break;
 369     case GDK_KEY_PRESS:
 370         switch (get_group0_keyval (&event->key)) {
 371         case GDK_Alt_L:
 372         case GDK_Alt_R:
 373         case GDK_Control_L:
 374         case GDK_Control_R:
 375         case GDK_Shift_L:
 376         case GDK_Shift_R:
 377         case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 378         case GDK_Meta_R:
 379             if (!dragging){
 380                 sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
 381                                             _("<b>Ctrl</b>: make square or integer-ratio rect, lock a rounded corner circular"),
 382                                             _("<b>Shift</b>: draw around the starting point"),
 383                                             NULL);
 384             }
 385             break;
 386         case GDK_Up:
 387         case GDK_Down:
 388         case GDK_KP_Up:
 389         case GDK_KP_Down:
 390             // prevent the zoom field from activation
 391             if (!MOD__CTRL_ONLY)
 392                 ret = TRUE;
 393             break;
 394
 395         case GDK_x:
 396         case GDK_X:
 397             if (MOD__ALT_ONLY) {
 398                 desktop->setToolboxFocusTo ("altx-rect");
 399                 ret = TRUE;
 400             }
 401             break;
 402
 403         case GDK_T:
 404             {
 405                 Inkscape::Selection *selection = sp_desktop_selection (inkscape_active_desktop());
 406                 SPItem *item = selection->singleItem();
 407                 if (item && SP_IS_RECT (item)) {
 408                     g_print ("Scaling transformation matrix\n");
 409                     SP_RECT (item)->transform = nr_matrix_set_scale(SP_RECT (item)->transform, 1.25, 1.5);
 410                     SP_OBJECT (item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
 411                 }
 412                 ret = TRUE;
 413             }
 414             break;
 415
 416         case GDK_Escape:
 417             sp_desktop_selection(desktop)->clear();
 418             //TODO: make dragging escapable by Esc
 419             break;
 420
 421         case GDK_space:
 422             if (dragging) {
 423                 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
 424                                       event->button.time);
 425                 dragging = false;
 426                 if (!event_context->within_tolerance) {
 427                     // we've been dragging, finish the rect
 428                     sp_rect_finish(rc);
 429                 }
 430                 // do not return true, so that space would work switching to selector
 431             }
 432             break;
 433
 434         default:
 435             break;
 436         }
 437         break;
 438     case GDK_KEY_RELEASE:
 439         switch (get_group0_keyval (&event->key)) {
 440         case GDK_Alt_L:
 441         case GDK_Alt_R:
 442         case GDK_Control_L:
 443         case GDK_Control_R:
 444         case GDK_Shift_L:
 445         case GDK_Shift_R:
 446         case GDK_Meta_L:  // Meta is when you press Shift+Alt
 447         case GDK_Meta_R:
 448             event_context->defaultMessageContext()->clear();
 449             break;
 450         default:
 451             break;
 452         }
 453         break;
 454     default:
 455         break;
 456     }
 457
 458     if (!ret) {
 459         if (((SPEventContextClass *) parent_class)->root_handler) {
 460             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 461         }
 462     }
 463
 464     return ret;
 465 }
 466
 467 static void sp_rect_drag(SPRectContext &rc, NR::Point const pt, guint state)
 468 {
 469     SPDesktop *desktop = SP_EVENT_CONTEXT(&rc)->desktop;
 470
 471     if (!rc.item) {
 472
 473         if (Inkscape::have_viable_layer(desktop, rc._message_context) == false) {
 474             return;
 475         }
 476
 477         /* Create object */
 478         Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_EVENT_CONTEXT_DOCUMENT(&rc));
 479         Inkscape::XML::Node *repr = xml_doc->createElement("svg:rect");
 480
 481         /* Set style */
 482         sp_desktop_apply_style_tool (desktop, repr, "tools.shapes.rect", false);
 483
 484         rc.item = (SPItem *) desktop->currentLayer()->appendChildRepr(repr);
 485         Inkscape::GC::release(repr);
 486         rc.item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 487         rc.item->updateRepr();
 488
 489         sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 490     }
 491
 492     NR::Rect const r = Inkscape::snap_rectangular_box(desktop, rc.item, pt, rc.center, state);
 493
 494     sp_rect_position_set(SP_RECT(rc.item), r.min()[NR::X], r.min()[NR::Y], r.dimensions()[NR::X], r.dimensions()[NR::Y]);
 495     if ( rc.rx != 0.0 ) {
 496         sp_rect_set_rx (SP_RECT(rc.item), TRUE, rc.rx);
 497     }
 498     if ( rc.ry != 0.0 ) {
 499         if (rc.rx == 0.0)
 500             sp_rect_set_ry (SP_RECT(rc.item), TRUE, CLAMP(rc.ry, 0, MIN(r.dimensions()[NR::X], r.dimensions()[NR::Y])/2));
 501         else
 502             sp_rect_set_ry (SP_RECT(rc.item), TRUE, CLAMP(rc.ry, 0, r.dimensions()[NR::Y]));
 503     }
 504
 505     // status text
 506     double rdimx = r.dimensions()[NR::X];
 507     double rdimy = r.dimensions()[NR::Y];
 508     GString *xs = SP_PX_TO_METRIC_STRING(rdimx, desktop->namedview->getDefaultMetric());
 509     GString *ys = SP_PX_TO_METRIC_STRING(rdimy, desktop->namedview->getDefaultMetric());
 510     if (state & GDK_CONTROL_MASK) {
 511         int ratio_x, ratio_y;
 512         bool is_golden_ratio = false;
 513         if (fabs (rdimx) > fabs (rdimy)) {
 514             if (fabs(rdimx / rdimy - goldenratio) < 1e-6) {
 515                 is_golden_ratio = true;
 516             }
 517             ratio_x = (int) rint (rdimx / rdimy);
 518             ratio_y = 1;
 519         } else {
 520             if (fabs(rdimy / rdimx - goldenratio) < 1e-6) {
 521                 is_golden_ratio = true;
 522             }
 523             ratio_x = 1;
 524             ratio_y = (int) rint (rdimy / rdimx);
 525         }
 526         if (!is_golden_ratio) {
 527             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);
 528         } else {
 529             if (ratio_y == 1) {
 530                 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);
 531             } else {
 532                 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);
 533             }
 534         }
 535     } else {
 536         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);
 537     }
 538     g_string_free(xs, FALSE);
 539     g_string_free(ys, FALSE);
 540 }
 541
 542 static void sp_rect_finish(SPRectContext *rc)
 543 {
 544     rc->_message_context->clear();
 545
 546     if ( rc->item != NULL ) {
 547         SPDesktop * desktop;
 548
 549         desktop = SP_EVENT_CONTEXT_DESKTOP(rc);
 550
 551         SP_OBJECT(rc->item)->updateRepr();
 552
 553         sp_canvas_end_forced_full_redraws(desktop->canvas);
 554
 555         sp_desktop_selection(desktop)->set(rc->item);
 556         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_RECT,
 557                          _("Create rectangle"));
 558
 559         rc->item = NULL;
 560     }
 561 }
 562
 563 /*
 564   Local Variables:
 565   mode:c++
 566   c-file-style:"stroustrup"
 567   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 568   indent-tabs-mode:nil
 569   fill-column:99
 570   End:
 571 */
 572 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :