src/arc-context.cpp

   1 #define __SP_ARC_CONTEXT_C__
   2
   3 /** \file Ellipse drawing context. */
   4
   5 /*
   6  * Authors:
   7  *   Mitsuru Oka
   8  *   Lauris Kaplinski <lauris@kaplinski.com>
   9  *   bulia byak <buliabyak@users.sf.net>
  10  *
  11  * Copyright (C) 2006      Johan Engelen <johan@shouraizou.nl>
  12  * Copyright (C) 2002      Mitsuru Oka
  13  * Copyright (C) 2000-2002 Lauris Kaplinski
  14  * Copyright (C) 2000-2001 Ximian, Inc.
  15  *
  16  * Released under GNU GPL, read the file 'COPYING' for more information
  17  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 # include <config.h>
  21 #endif
  22 #include <gdk/gdkkeysyms.h>
  23
  24 #include "macros.h"
  25 #include <glibmm/i18n.h>
  26 #include "display/sp-canvas.h"
  27 #include "sp-ellipse.h"
  28 #include "document.h"
  29 #include "sp-namedview.h"
  30 #include "selection.h"
  31 #include "desktop-handles.h"
  32 #include "snap.h"
  33 #include "pixmaps/cursor-ellipse.xpm"
  34 #include "sp-metrics.h"
  35 #include "xml/repr.h"
  36 #include "xml/node-event-vector.h"
  37 #include "object-edit.h"
  38 #include "prefs-utils.h"
  39 #include "message-context.h"
  40 #include "desktop.h"
  41 #include "desktop-style.h"
  42 #include "context-fns.h"
  43 #include "verbs.h"
  44
  45 #include "arc-context.h"
  46
  47 static void sp_arc_context_class_init(SPArcContextClass *klass);
  48 static void sp_arc_context_init(SPArcContext *arc_context);
  49 static void sp_arc_context_dispose(GObject *object);
  50
  51 static void sp_arc_context_setup(SPEventContext *ec);
  52 static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  53 static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  54
  55 static void sp_arc_drag(SPArcContext *ec, NR::Point pt, guint state);
  56 static void sp_arc_finish(SPArcContext *ec);
  57
  58 static SPEventContextClass *parent_class;
  59
  60 GtkType sp_arc_context_get_type()
  61 {
  62     static GType type = 0;
  63     if (!type) {
  64         GTypeInfo info = {
  65             sizeof(SPArcContextClass),
  66             NULL, NULL,
  67             (GClassInitFunc) sp_arc_context_class_init,
  68             NULL, NULL,
  69             sizeof(SPArcContext),
  70             4,
  71             (GInstanceInitFunc) sp_arc_context_init,
  72             NULL,   /* value_table */
  73         };
  74         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPArcContext", &info, (GTypeFlags) 0);
  75     }
  76     return type;
  77 }
  78
  79 static void sp_arc_context_class_init(SPArcContextClass *klass)
  80 {
  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_arc_context_dispose;
  88
  89     event_context_class->setup = sp_arc_context_setup;
  90     event_context_class->root_handler = sp_arc_context_root_handler;
  91     event_context_class->item_handler = sp_arc_context_item_handler;
  92 }
  93
  94 static void sp_arc_context_init(SPArcContext *arc_context)
  95 {
  96     SPEventContext *event_context = SP_EVENT_CONTEXT(arc_context);
  97
  98     event_context->cursor_shape = cursor_ellipse_xpm;
  99     event_context->hot_x = 4;
 100     event_context->hot_y = 4;
 101     event_context->xp = 0;
 102     event_context->yp = 0;
 103     event_context->tolerance = 0;
 104     event_context->within_tolerance = false;
 105     event_context->item_to_select = NULL;
 106
 107     event_context->shape_repr = NULL;
 108     event_context->shape_knot_holder = NULL;
 109
 110     arc_context->item = NULL;
 111
 112     new (&arc_context->sel_changed_connection) sigc::connection();
 113 }
 114
 115 static void sp_arc_context_dispose(GObject *object)
 116 {
 117     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 118     SPArcContext *ac = SP_ARC_CONTEXT(object);
 119
 120     ec->enableGrDrag(false);
 121
 122     ac->sel_changed_connection.disconnect();
 123     ac->sel_changed_connection.~connection();
 124
 125     if (ec->shape_knot_holder) {
 126         sp_knot_holder_destroy(ec->shape_knot_holder);
 127         ec->shape_knot_holder = NULL;
 128     }
 129
 130     if (ec->shape_repr) { // remove old listener
 131         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 132         Inkscape::GC::release(ec->shape_repr);
 133         ec->shape_repr = 0;
 134     }
 135
 136     /* fixme: This is necessary because we do not grab */
 137     if (ac->item) {
 138         sp_arc_finish(ac);
 139     }
 140
 141     delete ac->_message_context;
 142
 143     G_OBJECT_CLASS(parent_class)->dispose(object);
 144 }
 145
 146 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
 147     NULL, /* child_added */
 148     NULL, /* child_removed */
 149     ec_shape_event_attr_changed,
 150     NULL, /* content_changed */
 151     NULL  /* order_changed */
 152 };
 153
 154 /**
 155 \brief  Callback that processes the "changed" signal on the selection;
 156 destroys old and creates new knotholder.
 157 */
 158 void sp_arc_context_selection_changed(Inkscape::Selection * selection, gpointer data)
 159 {
 160     SPArcContext *ac = SP_ARC_CONTEXT(data);
 161     SPEventContext *ec = SP_EVENT_CONTEXT(ac);
 162
 163     if (ec->shape_knot_holder) { // desktroy knotholder
 164         sp_knot_holder_destroy(ec->shape_knot_holder);
 165         ec->shape_knot_holder = NULL;
 166     }
 167
 168     if (ec->shape_repr) { // remove old listener
 169         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 170         Inkscape::GC::release(ec->shape_repr);
 171         ec->shape_repr = 0;
 172     }
 173
 174     SPItem *item = selection ? selection->singleItem() : NULL;
 175     if (item) {
 176         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 177         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 178         if (shape_repr) {
 179             ec->shape_repr = shape_repr;
 180             Inkscape::GC::anchor(shape_repr);
 181             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 182         }
 183     }
 184 }
 185
 186 static void sp_arc_context_setup(SPEventContext *ec)
 187 {
 188     SPArcContext *ac = SP_ARC_CONTEXT(ec);
 189     Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
 190
 191     if (((SPEventContextClass *) parent_class)->setup) {
 192         ((SPEventContextClass *) parent_class)->setup(ec);
 193     }
 194
 195     SPItem *item = selection->singleItem();
 196
 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     ac->sel_changed_connection.disconnect();
 208     ac->sel_changed_connection = selection->connectChanged(
 209         sigc::bind(sigc::ptr_fun(&sp_arc_context_selection_changed), (gpointer) ac)
 210         );
 211
 212     if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
 213         ec->enableSelectionCue();
 214     }
 215
 216     if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
 217         ec->enableGrDrag();
 218     }
 219
 220     ac->_message_context = new Inkscape::MessageContext(ec->desktop->messageStack());
 221 }
 222
 223 static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 224 {
 225     SPDesktop *desktop = event_context->desktop;
 226     gint ret = FALSE;
 227
 228     switch (event->type) {
 229         case GDK_BUTTON_PRESS:
 230             if (event->button.button == 1) {
 231                 Inkscape::setup_for_drag_start(desktop, event_context, event);
 232                 ret = TRUE;
 233             }
 234             break;
 235             // motion and release are always on root (why?)
 236         default:
 237             break;
 238     }
 239
 240     if (((SPEventContextClass *) parent_class)->item_handler) {
 241         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 242     }
 243
 244     return ret;
 245 }
 246
 247 static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 248 {
 249     static bool dragging;
 250
 251     SPDesktop *desktop = event_context->desktop;
 252     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 253     SPArcContext *ac = SP_ARC_CONTEXT(event_context);
 254
 255     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 256
 257     gint ret = FALSE;
 258
 259     switch (event->type) {
 260         case GDK_BUTTON_PRESS:
 261             if (event->button.button == 1) {
 262
 263                 dragging = true;
 264                 ac->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
 265
 266                 SnapManager const &m = desktop->namedview->snap_manager;
 267                 ac->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT, ac->center, ac->item).getPoint();
 268                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 269                                     GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
 270                                     GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK,
 271                                     NULL, event->button.time);
 272                 ret = TRUE;
 273             }
 274             break;
 275         case GDK_MOTION_NOTIFY:
 276             if (dragging && event->motion.state && GDK_BUTTON1_MASK) {
 277
 278                 if ( event_context->within_tolerance
 279                      && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 280                      && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 281                     break; // do not drag if we're within tolerance from origin
 282                 }
 283                 // Once the user has moved farther than tolerance from the original location
 284                 // (indicating they intend to draw, not click), then always process the
 285                 // motion notify coordinates as given (no snapping back to origin)
 286                 event_context->within_tolerance = false;
 287
 288                 NR::Point const motion_w(event->motion.x, event->motion.y);
 289                 NR::Point const motion_dt(desktop->w2d(motion_w));
 290                 sp_arc_drag(ac, motion_dt, event->motion.state);
 291                 ret = TRUE;
 292             }
 293             break;
 294         case GDK_BUTTON_RELEASE:
 295             event_context->xp = event_context->yp = 0;
 296             if (event->button.button == 1) {
 297                 dragging = false;
 298                 if (!event_context->within_tolerance) {
 299                     // we've been dragging, finish the arc
 300                     sp_arc_finish(ac);
 301                 } else if (event_context->item_to_select) {
 302                     // no dragging, select clicked item if any
 303                     if (event->button.state & GDK_SHIFT_MASK) {
 304                         selection->toggle(event_context->item_to_select);
 305                     } else {
 306                         selection->set(event_context->item_to_select);
 307                     }
 308                 } else {
 309                     // click in an empty space
 310                     selection->clear();
 311                 }
 312                 event_context->xp = 0;
 313                 event_context->yp = 0;
 314                 event_context->item_to_select = NULL;
 315                 ret = TRUE;
 316             }
 317             sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
 318             break;
 319         case GDK_KEY_PRESS:
 320             switch (get_group0_keyval (&event->key)) {
 321                 case GDK_Alt_L:
 322                 case GDK_Alt_R:
 323                 case GDK_Control_L:
 324                 case GDK_Control_R:
 325                 case GDK_Shift_L:
 326                 case GDK_Shift_R:
 327                 case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 328                 case GDK_Meta_R:
 329                     if (!dragging) {
 330                         sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
 331                                                    _("<b>Ctrl</b>: make circle or integer-ratio ellipse, snap arc/segment angle"),
 332                                                    _("<b>Shift</b>: draw around the starting point"),
 333                                                    NULL);
 334                     }
 335                     break;
 336                 case GDK_Up:
 337                 case GDK_Down:
 338                 case GDK_KP_Up:
 339                 case GDK_KP_Down:
 340                     // prevent the zoom field from activation
 341                     if (!MOD__CTRL_ONLY)
 342                         ret = TRUE;
 343                     break;
 344                 case GDK_x:
 345                 case GDK_X:
 346                     if (MOD__ALT_ONLY) {
 347                         desktop->setToolboxFocusTo ("altx-arc");
 348                         ret = TRUE;
 349                     }
 350                     break;
 351                 case GDK_Escape:
 352                     sp_desktop_selection(desktop)->clear();
 353                     //TODO: make dragging escapable by Esc
 354                 default:
 355                     break;
 356             }
 357             break;
 358         case GDK_KEY_RELEASE:
 359             switch (event->key.keyval) {
 360                 case GDK_Alt_L:
 361                 case GDK_Alt_R:
 362                 case GDK_Control_L:
 363                 case GDK_Control_R:
 364                 case GDK_Shift_L:
 365                 case GDK_Shift_R:
 366                 case GDK_Meta_L:  // Meta is when you press Shift+Alt
 367                 case GDK_Meta_R:
 368                     event_context->defaultMessageContext()->clear();
 369                     break;
 370                 default:
 371                     break;
 372             }
 373             break;
 374         default:
 375             break;
 376     }
 377
 378     if (!ret) {
 379         if (((SPEventContextClass *) parent_class)->root_handler) {
 380             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 381         }
 382     }
 383
 384     return ret;
 385 }
 386
 387 static void sp_arc_drag(SPArcContext *ac, NR::Point pt, guint state)
 388 {
 389     SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
 390
 391     if (!ac->item) {
 392
 393         if (Inkscape::have_viable_layer(desktop, ac->_message_context) == false) {
 394             return;
 395         }
 396
 397         /* Create object */
 398         Inkscape::XML::Node *repr = sp_repr_new("svg:path");
 399         repr->setAttribute("sodipodi:type", "arc");
 400
 401         /* Set style */
 402         sp_desktop_apply_style_tool(desktop, repr, "tools.shapes.arc", false);
 403
 404         ac->item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 405         Inkscape::GC::release(repr);
 406         ac->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 407         ac->item->updateRepr();
 408
 409         sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 410     }
 411
 412     NR::Rect const r = Inkscape::snap_rectangular_box(desktop, ac->item, pt, ac->center, state);
 413
 414     sp_arc_position_set(SP_ARC(ac->item),
 415                         r.midpoint()[NR::X], r.midpoint()[NR::Y],
 416                         r.dimensions()[NR::X] / 2, r.dimensions()[NR::Y] / 2);
 417
 418     GString *xs = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::X], desktop->namedview->getDefaultMetric());
 419     GString *ys = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::Y], desktop->namedview->getDefaultMetric());
 420     ac->_message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>Ellipse</b>: %s &#215; %s; with <b>Ctrl</b> to make circle or integer-ratio ellipse; with <b>Shift</b> to draw around the starting point"), xs->str, ys->str);
 421     g_string_free(xs, FALSE);
 422     g_string_free(ys, FALSE);
 423 }
 424
 425 static void sp_arc_finish(SPArcContext *ac)
 426 {
 427     ac->_message_context->clear();
 428
 429     if (ac->item != NULL) {
 430         SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
 431
 432         SP_OBJECT(ac->item)->updateRepr();
 433
 434         sp_canvas_end_forced_full_redraws(desktop->canvas);
 435
 436         sp_desktop_selection(desktop)->set(ac->item);
 437         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_ARC,
 438                          _("Create ellipse"));
 439
 440         ac->item = NULL;
 441     }
 442 }
 443
 444
 445 /*
 446   Local Variables:
 447   mode:c++
 448   c-file-style:"stroustrup"
 449   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 450   indent-tabs-mode:nil
 451   fill-column:99
 452   End:
 453 */
 454 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :