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 "pixmaps/cursor-rect.pixbuf"
  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->cursor_pixbuf = gdk_pixbuf_new_from_inline(
  98             -1,
  99             cursor_rect_pixbuf,
 100             FALSE,
 101             NULL);
 102     event_context->hot_x = 4;
 103     event_context->hot_y = 4;
 104     event_context->xp = 0;
 105     event_context->yp = 0;
 106     event_context->tolerance = 0;
 107     event_context->within_tolerance = false;
 108     event_context->item_to_select = NULL;
 109
 110     event_context->shape_repr = NULL;
 111     event_context->shape_knot_holder = NULL;
 112
 113     rect_context->item = NULL;
 114
 115     rect_context->rx = 0.0;
 116     rect_context->ry = 0.0;
 117
 118     new (&rect_context->sel_changed_connection) sigc::connection();
 119 }
 120
 121 static void sp_rect_context_dispose(GObject *object)
 122 {
 123     SPRectContext *rc = SP_RECT_CONTEXT(object);
 124     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 125
 126     ec->enableGrDrag(false);
 127
 128     rc->sel_changed_connection.disconnect();
 129     rc->sel_changed_connection.~connection();
 130
 131     /* fixme: This is necessary because we do not grab */
 132     if (rc->item) {
 133         sp_rect_finish(rc);
 134     }
 135
 136     if (ec->shape_knot_holder) {
 137         sp_knot_holder_destroy(ec->shape_knot_holder);
 138         ec->shape_knot_holder = NULL;
 139     }
 140
 141     if (ec->shape_repr) { // remove old listener
 142         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 143         Inkscape::GC::release(ec->shape_repr);
 144         ec->shape_repr = 0;
 145     }
 146
 147     if (rc->_message_context) {
 148         delete rc->_message_context;
 149     }
 150
 151     G_OBJECT_CLASS(parent_class)->dispose(object);
 152 }
 153
 154 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
 155     NULL, /* child_added */
 156     NULL, /* child_removed */
 157     ec_shape_event_attr_changed,
 158     NULL, /* content_changed */
 159     NULL  /* order_changed */
 160 };
 161
 162 /**
 163 \brief  Callback that processes the "changed" signal on the selection;
 164 destroys old and creates new knotholder
 165 */
 166 void sp_rect_context_selection_changed(Inkscape::Selection *selection, gpointer data)
 167 {
 168     SPRectContext *rc = SP_RECT_CONTEXT(data);
 169     SPEventContext *ec = SP_EVENT_CONTEXT(rc);
 170
 171     if (ec->shape_knot_holder) { // destroy knotholder
 172         sp_knot_holder_destroy(ec->shape_knot_holder);
 173         ec->shape_knot_holder = NULL;
 174     }
 175
 176     if (ec->shape_repr) { // remove old listener
 177         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 178         Inkscape::GC::release(ec->shape_repr);
 179         ec->shape_repr = 0;
 180     }
 181
 182     SPItem *item = selection->singleItem();
 183     if (item) {
 184         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 185         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 186         if (shape_repr) {
 187             ec->shape_repr = shape_repr;
 188             Inkscape::GC::anchor(shape_repr);
 189             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 190         }
 191     }
 192 }
 193
 194 static void sp_rect_context_setup(SPEventContext *ec)
 195 {
 196     SPRectContext *rc = SP_RECT_CONTEXT(ec);
 197
 198     if (((SPEventContextClass *) parent_class)->setup) {
 199         ((SPEventContextClass *) parent_class)->setup(ec);
 200     }
 201
 202     SPItem *item = sp_desktop_selection(ec->desktop)->singleItem();
 203     if (item) {
 204         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 205         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 206         if (shape_repr) {
 207             ec->shape_repr = shape_repr;
 208             Inkscape::GC::anchor(shape_repr);
 209             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 210         }
 211     }
 212
 213     rc->sel_changed_connection.disconnect();
 214     rc->sel_changed_connection = sp_desktop_selection(ec->desktop)->connectChanged(
 215         sigc::bind(sigc::ptr_fun(&sp_rect_context_selection_changed), (gpointer)rc)
 216     );
 217
 218     sp_event_context_read(ec, "rx");
 219     sp_event_context_read(ec, "ry");
 220
 221     if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
 222         ec->enableSelectionCue();
 223     }
 224
 225     if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
 226         ec->enableGrDrag();
 227     }
 228
 229     rc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 230 }
 231
 232 static void sp_rect_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 233 {
 234     SPRectContext *rc = SP_RECT_CONTEXT(ec);
 235
 236     /* fixme: Proper error handling for non-numeric data.  Use a locale-independent function like
 237      * g_ascii_strtod (or a thin wrapper that does the right thing for invalid values inf/nan). */
 238     if ( strcmp(key, "rx") == 0 ) {
 239         rc->rx = ( val
 240                          ? g_ascii_strtod (val, NULL)
 241                          : 0.0 );
 242     } else if ( strcmp(key, "ry") == 0 ) {
 243         rc->ry = ( val
 244                          ? g_ascii_strtod (val, NULL)
 245                          : 0.0 );
 246     }
 247 }
 248
 249 static gint sp_rect_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 250 {
 251     SPDesktop *desktop = event_context->desktop;
 252
 253     gint ret = FALSE;
 254
 255     switch (event->type) {
 256     case GDK_BUTTON_PRESS:
 257         if ( event->button.button == 1 ) {
 258             Inkscape::setup_for_drag_start(desktop, event_context, event);
 259             ret = TRUE;
 260         }
 261         break;
 262         // motion and release are always on root (why?)
 263     default:
 264         break;
 265     }
 266
 267     if (((SPEventContextClass *) parent_class)->item_handler) {
 268         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 269     }
 270
 271     return ret;
 272 }
 273
 274 static gint sp_rect_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 275 {
 276     static bool dragging;
 277
 278     SPDesktop *desktop = event_context->desktop;
 279     Inkscape::Selection *selection = sp_desktop_selection (desktop);
 280
 281     SPRectContext *rc = SP_RECT_CONTEXT(event_context);
 282
 283     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 284
 285     gint ret = FALSE;
 286     switch (event->type) {
 287     case GDK_BUTTON_PRESS:
 288         if ( event->button.button == 1 ) {
 289             NR::Point const button_w(event->button.x,
 290                                      event->button.y);
 291
 292             // save drag origin
 293             event_context->xp = (gint) button_w[NR::X];
 294             event_context->yp = (gint) button_w[NR::Y];
 295             event_context->within_tolerance = true;
 296
 297             // remember clicked item, disregarding groups, honoring Alt
 298             event_context->item_to_select = sp_event_context_find_item (desktop, button_w, event->button.state & GDK_MOD1_MASK, TRUE);
 299
 300             dragging = true;
 301
 302             /* Position center */
 303             NR::Point const button_dt(desktop->w2d(button_w));
 304
 305             /* Snap center */
 306             SnapManager const &m = desktop->namedview->snap_manager;
 307             rc->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT | Inkscape::Snapper::BBOX_POINT,
 308                                     button_dt, rc->item).getPoint();
 309
 310             sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 311                                 ( GDK_KEY_PRESS_MASK |
 312                                   GDK_BUTTON_RELEASE_MASK       |
 313                                   GDK_POINTER_MOTION_MASK       |
 314                                   GDK_BUTTON_PRESS_MASK ),
 315                                 NULL, event->button.time);
 316             ret = TRUE;
 317         }
 318         break;
 319     case GDK_MOTION_NOTIFY:
 320         if ( dragging
 321              && ( event->motion.state & GDK_BUTTON1_MASK ) )
 322         {
 323             if ( event_context->within_tolerance
 324                  && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 325                  && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 326                 break; // do not drag if we're within tolerance from origin
 327             }
 328             // Once the user has moved farther than tolerance from the original location
 329             // (indicating they intend to draw, not click), then always process the
 330             // motion notify coordinates as given (no snapping back to origin)
 331             event_context->within_tolerance = false;
 332
 333             NR::Point const motion_w(event->motion.x,
 334                                      event->motion.y);
 335             NR::Point const motion_dt(desktop->w2d(motion_w));
 336             sp_rect_drag(*rc, motion_dt, event->motion.state);
 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             sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
 377                                         _("<b>Ctrl</b>: make square or integer-ratio rect, lock a rounded corner circular"),
 378                                         _("<b>Shift</b>: draw around the starting point"),
 379                                         NULL);
 380             break;
 381         case GDK_Up:
 382         case GDK_Down:
 383         case GDK_KP_Up:
 384         case GDK_KP_Down:
 385             // prevent the zoom field from activation
 386             if (!MOD__CTRL_ONLY)
 387                 ret = TRUE;
 388             break;
 389
 390         case GDK_x:
 391         case GDK_X:
 392             if (MOD__ALT_ONLY) {
 393                 desktop->setToolboxFocusTo ("altx-rect");
 394                 ret = TRUE;
 395             }
 396             break;
 397
 398         case GDK_Escape:
 399             sp_desktop_selection(desktop)->clear();
 400             //TODO: make dragging escapable by Esc
 401         default:
 402             break;
 403         }
 404         break;
 405     case GDK_KEY_RELEASE:
 406         switch (get_group0_keyval (&event->key)) {
 407         case GDK_Alt_L:
 408         case GDK_Alt_R:
 409         case GDK_Control_L:
 410         case GDK_Control_R:
 411         case GDK_Shift_L:
 412         case GDK_Shift_R:
 413         case GDK_Meta_L:  // Meta is when you press Shift+Alt
 414         case GDK_Meta_R:
 415             event_context->defaultMessageContext()->clear();
 416             break;
 417         default:
 418             break;
 419         }
 420         break;
 421     default:
 422         break;
 423     }
 424
 425     if (!ret) {
 426         if (((SPEventContextClass *) parent_class)->root_handler) {
 427             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 428         }
 429     }
 430
 431     return ret;
 432 }
 433
 434 static void sp_rect_drag(SPRectContext &rc, NR::Point const pt, guint state)
 435 {
 436     SPDesktop *desktop = SP_EVENT_CONTEXT(&rc)->desktop;
 437
 438     if (!rc.item) {
 439
 440         if (Inkscape::have_viable_layer(desktop, rc._message_context) == false) {
 441             return;
 442         }
 443
 444         /* Create object */
 445         Inkscape::XML::Node *repr = sp_repr_new("svg:rect");
 446
 447         /* Set style */
 448         sp_desktop_apply_style_tool (desktop, repr, "tools.shapes.rect", false);
 449
 450         rc.item = (SPItem *) desktop->currentLayer()->appendChildRepr(repr);
 451         Inkscape::GC::release(repr);
 452         rc.item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 453         rc.item->updateRepr();
 454
 455         sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 456     }
 457
 458     NR::Rect const r = Inkscape::snap_rectangular_box(desktop, rc.item, pt, rc.center, state);
 459
 460     sp_rect_position_set(SP_RECT(rc.item), r.min()[NR::X], r.min()[NR::Y], r.dimensions()[NR::X], r.dimensions()[NR::Y]);
 461     if ( rc.rx != 0.0 ) {
 462         sp_rect_set_rx (SP_RECT(rc.item), TRUE, rc.rx);
 463     }
 464     if ( rc.ry != 0.0 ) {
 465         if (rc.rx == 0.0)
 466             sp_rect_set_ry (SP_RECT(rc.item), TRUE, CLAMP(rc.ry, 0, MIN(r.dimensions()[NR::X], r.dimensions()[NR::Y])/2));
 467         else
 468             sp_rect_set_ry (SP_RECT(rc.item), TRUE, CLAMP(rc.ry, 0, r.dimensions()[NR::Y]));
 469     }
 470
 471     // status text
 472     GString *xs = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::X], desktop->namedview->getDefaultMetric());
 473     GString *ys = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::Y], desktop->namedview->getDefaultMetric());
 474     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);
 475     g_string_free(xs, FALSE);
 476     g_string_free(ys, FALSE);
 477 }
 478
 479 static void sp_rect_finish(SPRectContext *rc)
 480 {
 481     rc->_message_context->clear();
 482
 483     if ( rc->item != NULL ) {
 484         SPDesktop * desktop;
 485
 486         desktop = SP_EVENT_CONTEXT_DESKTOP(rc);
 487
 488         SP_OBJECT(rc->item)->updateRepr();
 489
 490         sp_canvas_end_forced_full_redraws(desktop->canvas);
 491
 492         sp_desktop_selection(desktop)->set(rc->item);
 493         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_RECT,
 494                          _("Create rectangle"));
 495
 496         rc->item = NULL;
 497     }
 498 }
 499
 500 /*
 501   Local Variables:
 502   mode:c++
 503   c-file-style:"stroustrup"
 504   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 505   indent-tabs-mode:nil
 506   fill-column:99
 507   End:
 508 */
 509 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :