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) 2000-2005 authors
  11  * Copyright (C) 2000-2001 Ximian, Inc.
  12  *
  13  * Released under GNU GPL, read the file 'COPYING' for more information
  14  */
  15
  16 #include "config.h"
  17
  18 #include <gdk/gdkkeysyms.h>
  19
  20 #include "macros.h"
  21 #include "display/sp-canvas.h"
  22 #include "sp-rect.h"
  23 #include "document.h"
  24 #include "sp-namedview.h"
  25 #include "selection.h"
  26 #include "desktop-handles.h"
  27 #include "snap.h"
  28 #include "desktop.h"
  29 #include "desktop-style.h"
  30 #include "message-context.h"
  31 #include "pixmaps/cursor-rect.xpm"
  32 #include "rect-context.h"
  33 #include "sp-metrics.h"
  34 #include <glibmm/i18n.h>
  35 #include "object-edit.h"
  36 #include "xml/repr.h"
  37 #include "xml/node-event-vector.h"
  38 #include "prefs-utils.h"
  39 #include "context-fns.h"
  40
  41 static void sp_rect_context_class_init(SPRectContextClass *klass);
  42 static void sp_rect_context_init(SPRectContext *rect_context);
  43 static void sp_rect_context_dispose(GObject *object);
  44
  45 static void sp_rect_context_setup(SPEventContext *ec);
  46 static void sp_rect_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  47
  48 static gint sp_rect_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  49 static gint sp_rect_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  50
  51 static void sp_rect_drag(SPRectContext &rc, NR::Point const pt, guint state);
  52 static void sp_rect_finish(SPRectContext *rc);
  53
  54 static SPEventContextClass *parent_class;
  55
  56
  57 GtkType sp_rect_context_get_type()
  58 {
  59     static GType type = 0;
  60     if (!type) {
  61         GTypeInfo info = {
  62             sizeof(SPRectContextClass),
  63             NULL, NULL,
  64             (GClassInitFunc) sp_rect_context_class_init,
  65             NULL, NULL,
  66             sizeof(SPRectContext),
  67             4,
  68             (GInstanceInitFunc) sp_rect_context_init,
  69             NULL,    /* value_table */
  70         };
  71         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPRectContext", &info, (GTypeFlags) 0);
  72     }
  73     return type;
  74 }
  75
  76 static void sp_rect_context_class_init(SPRectContextClass *klass)
  77 {
  78     GObjectClass *object_class = (GObjectClass *) klass;
  79     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  80
  81     parent_class = (SPEventContextClass *) g_type_class_peek_parent(klass);
  82
  83     object_class->dispose = sp_rect_context_dispose;
  84
  85     event_context_class->setup = sp_rect_context_setup;
  86     event_context_class->set = sp_rect_context_set;
  87     event_context_class->root_handler  = sp_rect_context_root_handler;
  88     event_context_class->item_handler  = sp_rect_context_item_handler;
  89 }
  90
  91 static void sp_rect_context_init(SPRectContext *rect_context)
  92 {
  93     SPEventContext *event_context = SP_EVENT_CONTEXT(rect_context);
  94
  95     event_context->cursor_shape = cursor_rect_xpm;
  96     event_context->hot_x = 4;
  97     event_context->hot_y = 4;
  98     event_context->xp = 0;
  99     event_context->yp = 0;
 100     event_context->tolerance = 0;
 101     event_context->within_tolerance = false;
 102     event_context->item_to_select = NULL;
 103
 104     event_context->shape_repr = NULL;
 105     event_context->shape_knot_holder = NULL;
 106
 107     rect_context->item = NULL;
 108
 109     rect_context->rx = 0.0;
 110     rect_context->ry = 0.0;
 111
 112     new (&rect_context->sel_changed_connection) sigc::connection();
 113 }
 114
 115 static void sp_rect_context_dispose(GObject *object)
 116 {
 117     SPRectContext *rc = SP_RECT_CONTEXT(object);
 118     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 119
 120     ec->enableGrDrag(false);
 121
 122     rc->sel_changed_connection.disconnect();
 123     rc->sel_changed_connection.~connection();
 124
 125     /* fixme: This is necessary because we do not grab */
 126     if (rc->item) {
 127         sp_rect_finish(rc);
 128     }
 129
 130     if (ec->shape_knot_holder) {
 131         sp_knot_holder_destroy(ec->shape_knot_holder);
 132         ec->shape_knot_holder = NULL;
 133     }
 134
 135     if (ec->shape_repr) { // remove old listener
 136         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 137         Inkscape::GC::release(ec->shape_repr);
 138         ec->shape_repr = 0;
 139     }
 140
 141     if (rc->_message_context) {
 142         delete rc->_message_context;
 143     }
 144
 145     G_OBJECT_CLASS(parent_class)->dispose(object);
 146 }
 147
 148 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
 149     NULL, /* child_added */
 150     NULL, /* child_removed */
 151     ec_shape_event_attr_changed,
 152     NULL, /* content_changed */
 153     NULL  /* order_changed */
 154 };
 155
 156 /**
 157 \brief  Callback that processes the "changed" signal on the selection;
 158 destroys old and creates new knotholder
 159 */
 160 void sp_rect_context_selection_changed(Inkscape::Selection *selection, gpointer data)
 161 {
 162     SPRectContext *rc = SP_RECT_CONTEXT(data);
 163     SPEventContext *ec = SP_EVENT_CONTEXT(rc);
 164
 165     if (ec->shape_knot_holder) { // destroy knotholder
 166         sp_knot_holder_destroy(ec->shape_knot_holder);
 167         ec->shape_knot_holder = NULL;
 168     }
 169
 170     if (ec->shape_repr) { // remove old listener
 171         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 172         Inkscape::GC::release(ec->shape_repr);
 173         ec->shape_repr = 0;
 174     }
 175
 176     SPItem *item = selection->singleItem();
 177     if (item) {
 178         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 179         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 180         if (shape_repr) {
 181             ec->shape_repr = shape_repr;
 182             Inkscape::GC::anchor(shape_repr);
 183             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 184         }
 185     }
 186 }
 187
 188 static void sp_rect_context_setup(SPEventContext *ec)
 189 {
 190     SPRectContext *rc = SP_RECT_CONTEXT(ec);
 191
 192     if (((SPEventContextClass *) parent_class)->setup) {
 193         ((SPEventContextClass *) parent_class)->setup(ec);
 194     }
 195
 196     SPItem *item = SP_DT_SELECTION(ec->desktop)->singleItem();
 197     if (item) {
 198         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 199         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 200         if (shape_repr) {
 201             ec->shape_repr = shape_repr;
 202             Inkscape::GC::anchor(shape_repr);
 203             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 204         }
 205     }
 206
 207     rc->sel_changed_connection.disconnect();
 208     rc->sel_changed_connection = SP_DT_SELECTION(ec->desktop)->connectChanged(
 209         sigc::bind(sigc::ptr_fun(&sp_rect_context_selection_changed), (gpointer)rc)
 210     );
 211
 212     sp_event_context_read(ec, "rx");
 213     sp_event_context_read(ec, "ry");
 214
 215     if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
 216         ec->enableSelectionCue();
 217     }
 218
 219     if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
 220         ec->enableGrDrag();
 221     }
 222
 223     rc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 224 }
 225
 226 static void sp_rect_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 227 {
 228     SPRectContext *rc = SP_RECT_CONTEXT(ec);
 229
 230     /* fixme: Proper error handling for non-numeric data.  Use a locale-independent function like
 231      * g_ascii_strtod (or a thin wrapper that does the right thing for invalid values inf/nan). */
 232     if ( strcmp(key, "rx") == 0 ) {
 233         rc->rx = ( val
 234                          ? g_ascii_strtod (val, NULL)
 235                          : 0.0 );
 236     } else if ( strcmp(key, "ry") == 0 ) {
 237         rc->ry = ( val
 238                          ? g_ascii_strtod (val, NULL)
 239                          : 0.0 );
 240     }
 241 }
 242
 243 static gint sp_rect_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 244 {
 245     SPDesktop *desktop = event_context->desktop;
 246
 247     gint ret = FALSE;
 248
 249     switch (event->type) {
 250     case GDK_BUTTON_PRESS:
 251         if ( event->button.button == 1 ) {
 252             Inkscape::setup_for_drag_start(desktop, event_context, event);
 253             ret = TRUE;
 254         }
 255         break;
 256         // motion and release are always on root (why?)
 257     default:
 258         break;
 259     }
 260
 261     if (((SPEventContextClass *) parent_class)->item_handler) {
 262         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 263     }
 264
 265     return ret;
 266 }
 267
 268 static gint sp_rect_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 269 {
 270     static bool dragging;
 271
 272     SPDesktop *desktop = event_context->desktop;
 273     Inkscape::Selection *selection = SP_DT_SELECTION (desktop);
 274
 275     SPRectContext *rc = SP_RECT_CONTEXT(event_context);
 276
 277     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 278
 279     gint ret = FALSE;
 280     switch (event->type) {
 281     case GDK_BUTTON_PRESS:
 282         if ( event->button.button == 1 ) {
 283             NR::Point const button_w(event->button.x,
 284                                      event->button.y);
 285
 286             // save drag origin
 287             event_context->xp = (gint) button_w[NR::X];
 288             event_context->yp = (gint) button_w[NR::Y];
 289             event_context->within_tolerance = true;
 290
 291             // remember clicked item, disregarding groups, honoring Alt
 292             event_context->item_to_select = sp_event_context_find_item (desktop, button_w, event->button.state & GDK_MOD1_MASK, TRUE);
 293
 294             dragging = true;
 295
 296             /* Position center */
 297             NR::Point const button_dt(desktop->w2d(button_w));
 298
 299             /* Snap center */
 300             SnapManager const m(desktop->namedview);
 301             rc->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT | Inkscape::Snapper::BBOX_POINT,
 302                                     button_dt, rc->item).getPoint();
 303
 304             sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 305                                 ( GDK_KEY_PRESS_MASK |
 306                                   GDK_BUTTON_RELEASE_MASK       |
 307                                   GDK_POINTER_MOTION_MASK       |
 308                                   GDK_POINTER_MOTION_HINT_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 const motion_dt(desktop->w2d(motion_w));
 331             sp_rect_drag(*rc, motion_dt, event->motion.state);
 332             ret = TRUE;
 333         }
 334         break;
 335     case GDK_BUTTON_RELEASE:
 336         event_context->xp = event_context->yp = 0;
 337         if ( event->button.button == 1 ) {
 338             dragging = false;
 339
 340             if (!event_context->within_tolerance) {
 341                 // we've been dragging, finish the rect
 342                 sp_rect_finish(rc);
 343             } else if (event_context->item_to_select) {
 344                 // no dragging, select clicked item if any
 345                 if (event->button.state & GDK_SHIFT_MASK) {
 346                     selection->toggle(event_context->item_to_select);
 347                 } else {
 348                     selection->set(event_context->item_to_select);
 349                 }
 350             } else {
 351                 // click in an empty space
 352                 selection->clear();
 353             }
 354
 355             event_context->item_to_select = NULL;
 356             ret = TRUE;
 357             sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
 358                                   event->button.time);
 359         }
 360         break;
 361     case GDK_KEY_PRESS:
 362         switch (get_group0_keyval (&event->key)) {
 363         case GDK_Alt_L:
 364         case GDK_Alt_R:
 365         case GDK_Control_L:
 366         case GDK_Control_R:
 367         case GDK_Shift_L:
 368         case GDK_Shift_R:
 369         case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 370         case GDK_Meta_R:
 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             break;
 376         case GDK_Up:
 377         case GDK_Down:
 378         case GDK_KP_Up:
 379         case GDK_KP_Down:
 380             // prevent the zoom field from activation
 381             if (!MOD__CTRL_ONLY)
 382                 ret = TRUE;
 383             break;
 384
 385         case GDK_x:
 386         case GDK_X:
 387             if (MOD__ALT_ONLY) {
 388                 desktop->setToolboxFocusTo ("altx-rect");
 389                 ret = TRUE;
 390             }
 391             break;
 392
 393         case GDK_Escape:
 394             SP_DT_SELECTION(desktop)->clear();
 395             //TODO: make dragging escapable by Esc
 396         default:
 397             break;
 398         }
 399         break;
 400     case GDK_KEY_RELEASE:
 401         switch (get_group0_keyval (&event->key)) {
 402         case GDK_Alt_L:
 403         case GDK_Alt_R:
 404         case GDK_Control_L:
 405         case GDK_Control_R:
 406         case GDK_Shift_L:
 407         case GDK_Shift_R:
 408         case GDK_Meta_L:  // Meta is when you press Shift+Alt
 409         case GDK_Meta_R:
 410             event_context->defaultMessageContext()->clear();
 411             break;
 412         default:
 413             break;
 414         }
 415         break;
 416     default:
 417         break;
 418     }
 419
 420     if (!ret) {
 421         if (((SPEventContextClass *) parent_class)->root_handler) {
 422             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 423         }
 424     }
 425
 426     return ret;
 427 }
 428
 429 static void sp_rect_drag(SPRectContext &rc, NR::Point const pt, guint state)
 430 {
 431     SPDesktop *desktop = SP_EVENT_CONTEXT(&rc)->desktop;
 432
 433     if (!rc.item) {
 434
 435         if (Inkscape::have_viable_layer(desktop, rc._message_context) == false) {
 436             return;
 437         }
 438
 439         /* Create object */
 440         Inkscape::XML::Node *repr = sp_repr_new("svg:rect");
 441
 442         /* Set style */
 443         sp_desktop_apply_style_tool (desktop, repr, "tools.shapes.rect", false);
 444
 445         rc.item = (SPItem *) desktop->currentLayer()->appendChildRepr(repr);
 446         Inkscape::GC::release(repr);
 447         rc.item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 448         rc.item->updateRepr();
 449     }
 450
 451     NR::Rect const r = Inkscape::snap_rectangular_box(desktop, rc.item, pt, rc.center, state);
 452
 453     sp_rect_position_set(SP_RECT(rc.item), r.min()[NR::X], r.min()[NR::Y], r.dimensions()[NR::X], r.dimensions()[NR::Y]);
 454     if ( rc.rx != 0.0 ) {
 455         sp_rect_set_rx (SP_RECT(rc.item), TRUE, rc.rx);
 456     }
 457     if ( rc.ry != 0.0 ) {
 458         if (rc.rx == 0.0)
 459             sp_rect_set_ry (SP_RECT(rc.item), TRUE, CLAMP(rc.ry, 0, MIN(r.dimensions()[NR::X], r.dimensions()[NR::Y])/2));
 460         else
 461             sp_rect_set_ry (SP_RECT(rc.item), TRUE, CLAMP(rc.ry, 0, r.dimensions()[NR::Y]));
 462     }
 463
 464     // status text
 465     GString *xs = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::X], desktop->namedview->getDefaultMetric());
 466     GString *ys = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::Y], desktop->namedview->getDefaultMetric());
 467     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);
 468     g_string_free(xs, FALSE);
 469     g_string_free(ys, FALSE);
 470 }
 471
 472 static void sp_rect_finish(SPRectContext *rc)
 473 {
 474     rc->_message_context->clear();
 475
 476     if ( rc->item != NULL ) {
 477         SPDesktop * dt;
 478
 479         dt = SP_EVENT_CONTEXT_DESKTOP(rc);
 480
 481         SP_OBJECT(rc->item)->updateRepr();
 482
 483         SP_DT_SELECTION(dt)->set(rc->item);
 484         sp_document_done(SP_DT_DOCUMENT(dt));
 485
 486         rc->item = NULL;
 487     }
 488 }
 489
 490 /*
 491   Local Variables:
 492   mode:c++
 493   c-file-style:"stroustrup"
 494   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 495   indent-tabs-mode:nil
 496   fill-column:99
 497   End:
 498 */
 499 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :