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
  21 #include "macros.h"
  22 #include "display/sp-canvas.h"
  23 #include "sp-rect.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 "desktop.h"
  30 #include "desktop-style.h"
  31 #include "message-context.h"
  32 #include "pixmaps/cursor-rect.xpm"
  33 #include "rect-context.h"
  34 #include "sp-metrics.h"
  35 #include <glibmm/i18n.h>
  36 #include "object-edit.h"
  37 #include "xml/repr.h"
  38 #include "xml/node-event-vector.h"
  39 #include "prefs-utils.h"
  40 #include "context-fns.h"
  41
  42 static void sp_rect_context_class_init(SPRectContextClass *klass);
  43 static void sp_rect_context_init(SPRectContext *rect_context);
  44 static void sp_rect_context_dispose(GObject *object);
  45
  46 static void sp_rect_context_setup(SPEventContext *ec);
  47 static void sp_rect_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  48
  49 static gint sp_rect_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  50 static gint sp_rect_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  51
  52 static void sp_rect_drag(SPRectContext &rc, NR::Point const pt, guint state);
  53 static void sp_rect_finish(SPRectContext *rc);
  54
  55 static SPEventContextClass *parent_class;
  56
  57
  58 GtkType sp_rect_context_get_type()
  59 {
  60     static GType type = 0;
  61     if (!type) {
  62         GTypeInfo info = {
  63             sizeof(SPRectContextClass),
  64             NULL, NULL,
  65             (GClassInitFunc) sp_rect_context_class_init,
  66             NULL, NULL,
  67             sizeof(SPRectContext),
  68             4,
  69             (GInstanceInitFunc) sp_rect_context_init,
  70             NULL,    /* value_table */
  71         };
  72         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPRectContext", &info, (GTypeFlags) 0);
  73     }
  74     return type;
  75 }
  76
  77 static void sp_rect_context_class_init(SPRectContextClass *klass)
  78 {
  79     GObjectClass *object_class = (GObjectClass *) klass;
  80     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  81
  82     parent_class = (SPEventContextClass *) g_type_class_peek_parent(klass);
  83
  84     object_class->dispose = sp_rect_context_dispose;
  85
  86     event_context_class->setup = sp_rect_context_setup;
  87     event_context_class->set = sp_rect_context_set;
  88     event_context_class->root_handler  = sp_rect_context_root_handler;
  89     event_context_class->item_handler  = sp_rect_context_item_handler;
  90 }
  91
  92 static void sp_rect_context_init(SPRectContext *rect_context)
  93 {
  94     SPEventContext *event_context = SP_EVENT_CONTEXT(rect_context);
  95
  96     event_context->cursor_shape = cursor_rect_xpm;
  97     event_context->hot_x = 4;
  98     event_context->hot_y = 4;
  99     event_context->xp = 0;
 100     event_context->yp = 0;
 101     event_context->tolerance = 0;
 102     event_context->within_tolerance = false;
 103     event_context->item_to_select = NULL;
 104
 105     event_context->shape_repr = NULL;
 106     event_context->shape_knot_holder = NULL;
 107
 108     rect_context->item = NULL;
 109
 110     rect_context->rx = 0.0;
 111     rect_context->ry = 0.0;
 112
 113     new (&rect_context->sel_changed_connection) sigc::connection();
 114 }
 115
 116 static void sp_rect_context_dispose(GObject *object)
 117 {
 118     SPRectContext *rc = SP_RECT_CONTEXT(object);
 119     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 120
 121     ec->enableGrDrag(false);
 122
 123     rc->sel_changed_connection.disconnect();
 124     rc->sel_changed_connection.~connection();
 125
 126     /* fixme: This is necessary because we do not grab */
 127     if (rc->item) {
 128         sp_rect_finish(rc);
 129     }
 130
 131     if (ec->shape_knot_holder) {
 132         sp_knot_holder_destroy(ec->shape_knot_holder);
 133         ec->shape_knot_holder = NULL;
 134     }
 135
 136     if (ec->shape_repr) { // remove old listener
 137         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 138         Inkscape::GC::release(ec->shape_repr);
 139         ec->shape_repr = 0;
 140     }
 141
 142     if (rc->_message_context) {
 143         delete rc->_message_context;
 144     }
 145
 146     G_OBJECT_CLASS(parent_class)->dispose(object);
 147 }
 148
 149 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
 150     NULL, /* child_added */
 151     NULL, /* child_removed */
 152     ec_shape_event_attr_changed,
 153     NULL, /* content_changed */
 154     NULL  /* order_changed */
 155 };
 156
 157 /**
 158 \brief  Callback that processes the "changed" signal on the selection;
 159 destroys old and creates new knotholder
 160 */
 161 void sp_rect_context_selection_changed(Inkscape::Selection *selection, gpointer data)
 162 {
 163     SPRectContext *rc = SP_RECT_CONTEXT(data);
 164     SPEventContext *ec = SP_EVENT_CONTEXT(rc);
 165
 166     if (ec->shape_knot_holder) { // destroy knotholder
 167         sp_knot_holder_destroy(ec->shape_knot_holder);
 168         ec->shape_knot_holder = NULL;
 169     }
 170
 171     if (ec->shape_repr) { // remove old listener
 172         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 173         Inkscape::GC::release(ec->shape_repr);
 174         ec->shape_repr = 0;
 175     }
 176
 177     SPItem *item = selection->singleItem();
 178     if (item) {
 179         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 180         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 181         if (shape_repr) {
 182             ec->shape_repr = shape_repr;
 183             Inkscape::GC::anchor(shape_repr);
 184             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 185         }
 186     }
 187 }
 188
 189 static void sp_rect_context_setup(SPEventContext *ec)
 190 {
 191     SPRectContext *rc = SP_RECT_CONTEXT(ec);
 192
 193     if (((SPEventContextClass *) parent_class)->setup) {
 194         ((SPEventContextClass *) parent_class)->setup(ec);
 195     }
 196
 197     SPItem *item = sp_desktop_selection(ec->desktop)->singleItem();
 198     if (item) {
 199         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 200         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 201         if (shape_repr) {
 202             ec->shape_repr = shape_repr;
 203             Inkscape::GC::anchor(shape_repr);
 204             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 205         }
 206     }
 207
 208     rc->sel_changed_connection.disconnect();
 209     rc->sel_changed_connection = sp_desktop_selection(ec->desktop)->connectChanged(
 210         sigc::bind(sigc::ptr_fun(&sp_rect_context_selection_changed), (gpointer)rc)
 211     );
 212
 213     sp_event_context_read(ec, "rx");
 214     sp_event_context_read(ec, "ry");
 215
 216     if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
 217         ec->enableSelectionCue();
 218     }
 219
 220     if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
 221         ec->enableGrDrag();
 222     }
 223
 224     rc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 225 }
 226
 227 static void sp_rect_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 228 {
 229     SPRectContext *rc = SP_RECT_CONTEXT(ec);
 230
 231     /* fixme: Proper error handling for non-numeric data.  Use a locale-independent function like
 232      * g_ascii_strtod (or a thin wrapper that does the right thing for invalid values inf/nan). */
 233     if ( strcmp(key, "rx") == 0 ) {
 234         rc->rx = ( val
 235                          ? g_ascii_strtod (val, NULL)
 236                          : 0.0 );
 237     } else if ( strcmp(key, "ry") == 0 ) {
 238         rc->ry = ( val
 239                          ? g_ascii_strtod (val, NULL)
 240                          : 0.0 );
 241     }
 242 }
 243
 244 static gint sp_rect_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 245 {
 246     SPDesktop *desktop = event_context->desktop;
 247
 248     gint ret = FALSE;
 249
 250     switch (event->type) {
 251     case GDK_BUTTON_PRESS:
 252         if ( event->button.button == 1 ) {
 253             Inkscape::setup_for_drag_start(desktop, event_context, event);
 254             ret = TRUE;
 255         }
 256         break;
 257         // motion and release are always on root (why?)
 258     default:
 259         break;
 260     }
 261
 262     if (((SPEventContextClass *) parent_class)->item_handler) {
 263         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 264     }
 265
 266     return ret;
 267 }
 268
 269 static gint sp_rect_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 270 {
 271     static bool dragging;
 272
 273     SPDesktop *desktop = event_context->desktop;
 274     Inkscape::Selection *selection = sp_desktop_selection (desktop);
 275
 276     SPRectContext *rc = SP_RECT_CONTEXT(event_context);
 277
 278     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 279
 280     gint ret = FALSE;
 281     switch (event->type) {
 282     case GDK_BUTTON_PRESS:
 283         if ( event->button.button == 1 ) {
 284             NR::Point const button_w(event->button.x,
 285                                      event->button.y);
 286
 287             // save drag origin
 288             event_context->xp = (gint) button_w[NR::X];
 289             event_context->yp = (gint) button_w[NR::Y];
 290             event_context->within_tolerance = true;
 291
 292             // remember clicked item, disregarding groups, honoring Alt
 293             event_context->item_to_select = sp_event_context_find_item (desktop, button_w, event->button.state & GDK_MOD1_MASK, TRUE);
 294
 295             dragging = true;
 296
 297             /* Position center */
 298             NR::Point const button_dt(desktop->w2d(button_w));
 299
 300             /* Snap center */
 301             SnapManager const &m = desktop->namedview->snap_manager;
 302             rc->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT | Inkscape::Snapper::BBOX_POINT,
 303                                     button_dt, rc->item).getPoint();
 304
 305             sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 306                                 ( GDK_KEY_PRESS_MASK |
 307                                   GDK_BUTTON_RELEASE_MASK       |
 308                                   GDK_POINTER_MOTION_MASK       |
 309                                   GDK_BUTTON_PRESS_MASK ),
 310                                 NULL, event->button.time);
 311             ret = TRUE;
 312         }
 313         break;
 314     case GDK_MOTION_NOTIFY:
 315         if ( dragging
 316              && ( event->motion.state & GDK_BUTTON1_MASK ) )
 317         {
 318             if ( event_context->within_tolerance
 319                  && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 320                  && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 321                 break; // do not drag if we're within tolerance from origin
 322             }
 323             // Once the user has moved farther than tolerance from the original location
 324             // (indicating they intend to draw, not click), then always process the
 325             // motion notify coordinates as given (no snapping back to origin)
 326             event_context->within_tolerance = false;
 327
 328             NR::Point const motion_w(event->motion.x,
 329                                      event->motion.y);
 330             NR::Point motion_dt(desktop->w2d(motion_w));
 331
 332             SnapManager const &m = desktop->namedview->snap_manager;
 333             motion_dt = m.freeSnap(Inkscape::Snapper::BBOX_POINT | Inkscape::Snapper::SNAP_POINT, motion_dt, rc->item).getPoint();
 334
 335             sp_rect_drag(*rc, motion_dt, event->motion.state);
 336
 337             ret = TRUE;
 338         }
 339         break;
 340     case GDK_BUTTON_RELEASE:
 341         event_context->xp = event_context->yp = 0;
 342         if ( event->button.button == 1 ) {
 343             dragging = false;
 344
 345             if (!event_context->within_tolerance) {
 346                 // we've been dragging, finish the rect
 347                 sp_rect_finish(rc);
 348             } else if (event_context->item_to_select) {
 349                 // no dragging, select clicked item if any
 350                 if (event->button.state & GDK_SHIFT_MASK) {
 351                     selection->toggle(event_context->item_to_select);
 352                 } else {
 353                     selection->set(event_context->item_to_select);
 354                 }
 355             } else {
 356                 // click in an empty space
 357                 selection->clear();
 358             }
 359
 360             event_context->item_to_select = NULL;
 361             ret = TRUE;
 362             sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
 363                                   event->button.time);
 364         }
 365         break;
 366     case GDK_KEY_PRESS:
 367         switch (get_group0_keyval (&event->key)) {
 368         case GDK_Alt_L:
 369         case GDK_Alt_R:
 370         case GDK_Control_L:
 371         case GDK_Control_R:
 372         case GDK_Shift_L:
 373         case GDK_Shift_R:
 374         case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 375         case GDK_Meta_R:
 376             if (!dragging){
 377                 sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
 378                                             _("<b>Ctrl</b>: make square or integer-ratio rect, lock a rounded corner circular"),
 379                                             _("<b>Shift</b>: draw around the starting point"),
 380                                             NULL);
 381             }
 382             break;
 383         case GDK_Up:
 384         case GDK_Down:
 385         case GDK_KP_Up:
 386         case GDK_KP_Down:
 387             // prevent the zoom field from activation
 388             if (!MOD__CTRL_ONLY)
 389                 ret = TRUE;
 390             break;
 391
 392         case GDK_x:
 393         case GDK_X:
 394             if (MOD__ALT_ONLY) {
 395                 desktop->setToolboxFocusTo ("altx-rect");
 396                 ret = TRUE;
 397             }
 398             break;
 399
 400         case GDK_Escape:
 401             sp_desktop_selection(desktop)->clear();
 402             //TODO: make dragging escapable by Esc
 403             break;
 404
 405         case GDK_space:
 406             if (dragging) {
 407                 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
 408                                       event->button.time);
 409                 dragging = false;
 410                 if (!event_context->within_tolerance) {
 411                     // we've been dragging, finish the rect
 412                     sp_rect_finish(rc);
 413                 }
 414                 // do not return true, so that space would work switching to selector
 415             }
 416             break;
 417
 418         default:
 419             break;
 420         }
 421         break;
 422     case GDK_KEY_RELEASE:
 423         switch (get_group0_keyval (&event->key)) {
 424         case GDK_Alt_L:
 425         case GDK_Alt_R:
 426         case GDK_Control_L:
 427         case GDK_Control_R:
 428         case GDK_Shift_L:
 429         case GDK_Shift_R:
 430         case GDK_Meta_L:  // Meta is when you press Shift+Alt
 431         case GDK_Meta_R:
 432             event_context->defaultMessageContext()->clear();
 433             break;
 434         default:
 435             break;
 436         }
 437         break;
 438     default:
 439         break;
 440     }
 441
 442     if (!ret) {
 443         if (((SPEventContextClass *) parent_class)->root_handler) {
 444             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 445         }
 446     }
 447
 448     return ret;
 449 }
 450
 451 static void sp_rect_drag(SPRectContext &rc, NR::Point const pt, guint state)
 452 {
 453     SPDesktop *desktop = SP_EVENT_CONTEXT(&rc)->desktop;
 454
 455     if (!rc.item) {
 456
 457         if (Inkscape::have_viable_layer(desktop, rc._message_context) == false) {
 458             return;
 459         }
 460
 461         /* Create object */
 462         Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_EVENT_CONTEXT_DOCUMENT(&rc));
 463         Inkscape::XML::Node *repr = xml_doc->createElement("svg:rect");
 464
 465         /* Set style */
 466         sp_desktop_apply_style_tool (desktop, repr, "tools.shapes.rect", false);
 467
 468         rc.item = (SPItem *) desktop->currentLayer()->appendChildRepr(repr);
 469         Inkscape::GC::release(repr);
 470         rc.item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 471         rc.item->updateRepr();
 472
 473         sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 474     }
 475
 476     NR::Rect const r = Inkscape::snap_rectangular_box(desktop, rc.item, pt, rc.center, state);
 477
 478     sp_rect_position_set(SP_RECT(rc.item), r.min()[NR::X], r.min()[NR::Y], r.dimensions()[NR::X], r.dimensions()[NR::Y]);
 479     if ( rc.rx != 0.0 ) {
 480         sp_rect_set_rx (SP_RECT(rc.item), TRUE, rc.rx);
 481     }
 482     if ( rc.ry != 0.0 ) {
 483         if (rc.rx == 0.0)
 484             sp_rect_set_ry (SP_RECT(rc.item), TRUE, CLAMP(rc.ry, 0, MIN(r.dimensions()[NR::X], r.dimensions()[NR::Y])/2));
 485         else
 486             sp_rect_set_ry (SP_RECT(rc.item), TRUE, CLAMP(rc.ry, 0, r.dimensions()[NR::Y]));
 487     }
 488
 489     // status text
 490     GString *xs = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::X], desktop->namedview->getDefaultMetric());
 491     GString *ys = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::Y], desktop->namedview->getDefaultMetric());
 492     rc._message_context->setF(Inkscape::NORMAL_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);
 493     g_string_free(xs, FALSE);
 494     g_string_free(ys, FALSE);
 495 }
 496
 497 static void sp_rect_finish(SPRectContext *rc)
 498 {
 499     rc->_message_context->clear();
 500
 501     if ( rc->item != NULL ) {
 502         SPDesktop * desktop;
 503
 504         desktop = SP_EVENT_CONTEXT_DESKTOP(rc);
 505
 506         SP_OBJECT(rc->item)->updateRepr();
 507
 508         sp_canvas_end_forced_full_redraws(desktop->canvas);
 509
 510         sp_desktop_selection(desktop)->set(rc->item);
 511         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_RECT,
 512                          _("Create rectangle"));
 513
 514         rc->item = NULL;
 515     }
 516 }
 517
 518 /*
 519   Local Variables:
 520   mode:c++
 521   c-file-style:"stroustrup"
 522   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 523   indent-tabs-mode:nil
 524   fill-column:99
 525   End:
 526 */
 527 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :