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 "pixmaps/cursor-ellipse.pixbuf"
  35 #include "sp-metrics.h"
  36 #include "xml/repr.h"
  37 #include "xml/node-event-vector.h"
  38 #include "object-edit.h"
  39 #include "prefs-utils.h"
  40 #include "message-context.h"
  41 #include "desktop.h"
  42 #include "desktop-style.h"
  43 #include "context-fns.h"
  44 #include "verbs.h"
  45
  46 #include "arc-context.h"
  47
  48 static void sp_arc_context_class_init(SPArcContextClass *klass);
  49 static void sp_arc_context_init(SPArcContext *arc_context);
  50 static void sp_arc_context_dispose(GObject *object);
  51
  52 static void sp_arc_context_setup(SPEventContext *ec);
  53 static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  54 static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  55
  56 static void sp_arc_drag(SPArcContext *ec, NR::Point pt, guint state);
  57 static void sp_arc_finish(SPArcContext *ec);
  58
  59 static SPEventContextClass *parent_class;
  60
  61 GtkType sp_arc_context_get_type()
  62 {
  63     static GType type = 0;
  64     if (!type) {
  65         GTypeInfo info = {
  66             sizeof(SPArcContextClass),
  67             NULL, NULL,
  68             (GClassInitFunc) sp_arc_context_class_init,
  69             NULL, NULL,
  70             sizeof(SPArcContext),
  71             4,
  72             (GInstanceInitFunc) sp_arc_context_init,
  73             NULL,   /* value_table */
  74         };
  75         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPArcContext", &info, (GTypeFlags) 0);
  76     }
  77     return type;
  78 }
  79
  80 static void sp_arc_context_class_init(SPArcContextClass *klass)
  81 {
  82
  83     GObjectClass *object_class = (GObjectClass *) klass;
  84     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  85
  86     parent_class = (SPEventContextClass*) g_type_class_peek_parent(klass);
  87
  88     object_class->dispose = sp_arc_context_dispose;
  89
  90     event_context_class->setup = sp_arc_context_setup;
  91     event_context_class->root_handler = sp_arc_context_root_handler;
  92     event_context_class->item_handler = sp_arc_context_item_handler;
  93 }
  94
  95 static void sp_arc_context_init(SPArcContext *arc_context)
  96 {
  97     SPEventContext *event_context = SP_EVENT_CONTEXT(arc_context);
  98
  99     event_context->cursor_shape = cursor_ellipse_xpm;
 100     event_context->cursor_pixbuf = gdk_pixbuf_new_from_inline(
 101             -1,
 102             cursor_ellipse_pixbuf,
 103             FALSE,
 104             NULL);
 105     event_context->hot_x = 4;
 106     event_context->hot_y = 4;
 107     event_context->xp = 0;
 108     event_context->yp = 0;
 109     event_context->tolerance = 0;
 110     event_context->within_tolerance = false;
 111     event_context->item_to_select = NULL;
 112
 113     event_context->shape_repr = NULL;
 114     event_context->shape_knot_holder = NULL;
 115
 116     arc_context->item = NULL;
 117
 118     new (&arc_context->sel_changed_connection) sigc::connection();
 119 }
 120
 121 static void sp_arc_context_dispose(GObject *object)
 122 {
 123     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 124     SPArcContext *ac = SP_ARC_CONTEXT(object);
 125
 126     ec->enableGrDrag(false);
 127
 128     ac->sel_changed_connection.disconnect();
 129     ac->sel_changed_connection.~connection();
 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     /* fixme: This is necessary because we do not grab */
 143     if (ac->item) {
 144         sp_arc_finish(ac);
 145     }
 146
 147     delete ac->_message_context;
 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_arc_context_selection_changed(Inkscape::Selection * selection, gpointer data)
 165 {
 166     SPArcContext *ac = SP_ARC_CONTEXT(data);
 167     SPEventContext *ec = SP_EVENT_CONTEXT(ac);
 168
 169     if (ec->shape_knot_holder) { // desktroy 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 ? selection->singleItem() : NULL;
 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_arc_context_setup(SPEventContext *ec)
 193 {
 194     SPArcContext *ac = SP_ARC_CONTEXT(ec);
 195     Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
 196
 197     if (((SPEventContextClass *) parent_class)->setup) {
 198         ((SPEventContextClass *) parent_class)->setup(ec);
 199     }
 200
 201     SPItem *item = selection->singleItem();
 202
 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     ac->sel_changed_connection.disconnect();
 214     ac->sel_changed_connection = selection->connectChanged(
 215         sigc::bind(sigc::ptr_fun(&sp_arc_context_selection_changed), (gpointer) ac)
 216         );
 217
 218     if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
 219         ec->enableSelectionCue();
 220     }
 221
 222     if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
 223         ec->enableGrDrag();
 224     }
 225
 226     ac->_message_context = new Inkscape::MessageContext(ec->desktop->messageStack());
 227 }
 228
 229 static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 230 {
 231     SPDesktop *desktop = event_context->desktop;
 232     gint ret = FALSE;
 233
 234     switch (event->type) {
 235         case GDK_BUTTON_PRESS:
 236             if (event->button.button == 1) {
 237                 Inkscape::setup_for_drag_start(desktop, event_context, event);
 238                 ret = TRUE;
 239             }
 240             break;
 241             // motion and release are always on root (why?)
 242         default:
 243             break;
 244     }
 245
 246     if (((SPEventContextClass *) parent_class)->item_handler) {
 247         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 248     }
 249
 250     return ret;
 251 }
 252
 253 static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 254 {
 255     static bool dragging;
 256
 257     SPDesktop *desktop = event_context->desktop;
 258     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 259     SPArcContext *ac = SP_ARC_CONTEXT(event_context);
 260
 261     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 262
 263     gint ret = FALSE;
 264
 265     switch (event->type) {
 266         case GDK_BUTTON_PRESS:
 267             if (event->button.button == 1) {
 268
 269                 dragging = true;
 270                 ac->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
 271
 272                 SnapManager const &m = desktop->namedview->snap_manager;
 273                 ac->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT, ac->center, ac->item).getPoint();
 274                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 275                                     GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
 276                                     GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK,
 277                                     NULL, event->button.time);
 278                 ret = TRUE;
 279             }
 280             break;
 281         case GDK_MOTION_NOTIFY:
 282             if (dragging && event->motion.state && GDK_BUTTON1_MASK) {
 283
 284                 if ( event_context->within_tolerance
 285                      && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 286                      && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 287                     break; // do not drag if we're within tolerance from origin
 288                 }
 289                 // Once the user has moved farther than tolerance from the original location
 290                 // (indicating they intend to draw, not click), then always process the
 291                 // motion notify coordinates as given (no snapping back to origin)
 292                 event_context->within_tolerance = false;
 293
 294                 NR::Point const motion_w(event->motion.x, event->motion.y);
 295                 NR::Point const motion_dt(desktop->w2d(motion_w));
 296                 sp_arc_drag(ac, motion_dt, event->motion.state);
 297                 ret = TRUE;
 298             }
 299             break;
 300         case GDK_BUTTON_RELEASE:
 301             event_context->xp = event_context->yp = 0;
 302             if (event->button.button == 1) {
 303                 dragging = false;
 304                 if (!event_context->within_tolerance) {
 305                     // we've been dragging, finish the arc
 306                     sp_arc_finish(ac);
 307                 } else if (event_context->item_to_select) {
 308                     // no dragging, select clicked item if any
 309                     if (event->button.state & GDK_SHIFT_MASK) {
 310                         selection->toggle(event_context->item_to_select);
 311                     } else {
 312                         selection->set(event_context->item_to_select);
 313                     }
 314                 } else {
 315                     // click in an empty space
 316                     selection->clear();
 317                 }
 318                 event_context->xp = 0;
 319                 event_context->yp = 0;
 320                 event_context->item_to_select = NULL;
 321                 ret = TRUE;
 322             }
 323             sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
 324             break;
 325         case GDK_KEY_PRESS:
 326             switch (get_group0_keyval (&event->key)) {
 327                 case GDK_Alt_L:
 328                 case GDK_Alt_R:
 329                 case GDK_Control_L:
 330                 case GDK_Control_R:
 331                 case GDK_Shift_L:
 332                 case GDK_Shift_R:
 333                 case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 334                 case GDK_Meta_R:
 335                     if (!dragging) {
 336                         sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
 337                                                    _("<b>Ctrl</b>: make circle or integer-ratio ellipse, snap arc/segment angle"),
 338                                                    _("<b>Shift</b>: draw around the starting point"),
 339                                                    NULL);
 340                     }
 341                     break;
 342                 case GDK_Up:
 343                 case GDK_Down:
 344                 case GDK_KP_Up:
 345                 case GDK_KP_Down:
 346                     // prevent the zoom field from activation
 347                     if (!MOD__CTRL_ONLY)
 348                         ret = TRUE;
 349                     break;
 350                 case GDK_x:
 351                 case GDK_X:
 352                     if (MOD__ALT_ONLY) {
 353                         desktop->setToolboxFocusTo ("altx-arc");
 354                         ret = TRUE;
 355                     }
 356                     break;
 357                 case GDK_Escape:
 358                     sp_desktop_selection(desktop)->clear();
 359                     //TODO: make dragging escapable by Esc
 360                 default:
 361                     break;
 362             }
 363             break;
 364         case GDK_KEY_RELEASE:
 365             switch (event->key.keyval) {
 366                 case GDK_Alt_L:
 367                 case GDK_Alt_R:
 368                 case GDK_Control_L:
 369                 case GDK_Control_R:
 370                 case GDK_Shift_L:
 371                 case GDK_Shift_R:
 372                 case GDK_Meta_L:  // Meta is when you press Shift+Alt
 373                 case GDK_Meta_R:
 374                     event_context->defaultMessageContext()->clear();
 375                     break;
 376                 default:
 377                     break;
 378             }
 379             break;
 380         default:
 381             break;
 382     }
 383
 384     if (!ret) {
 385         if (((SPEventContextClass *) parent_class)->root_handler) {
 386             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 387         }
 388     }
 389
 390     return ret;
 391 }
 392
 393 static void sp_arc_drag(SPArcContext *ac, NR::Point pt, guint state)
 394 {
 395     SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
 396
 397     if (!ac->item) {
 398
 399         if (Inkscape::have_viable_layer(desktop, ac->_message_context) == false) {
 400             return;
 401         }
 402
 403         /* Create object */
 404         Inkscape::XML::Node *repr = sp_repr_new("svg:path");
 405         repr->setAttribute("sodipodi:type", "arc");
 406
 407         /* Set style */
 408         sp_desktop_apply_style_tool(desktop, repr, "tools.shapes.arc", false);
 409
 410         ac->item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 411         Inkscape::GC::release(repr);
 412         ac->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 413         ac->item->updateRepr();
 414
 415         sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 416     }
 417
 418     NR::Rect const r = Inkscape::snap_rectangular_box(desktop, ac->item, pt, ac->center, state);
 419
 420     sp_arc_position_set(SP_ARC(ac->item),
 421                         r.midpoint()[NR::X], r.midpoint()[NR::Y],
 422                         r.dimensions()[NR::X] / 2, r.dimensions()[NR::Y] / 2);
 423
 424     GString *xs = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::X], desktop->namedview->getDefaultMetric());
 425     GString *ys = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::Y], desktop->namedview->getDefaultMetric());
 426     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);
 427     g_string_free(xs, FALSE);
 428     g_string_free(ys, FALSE);
 429 }
 430
 431 static void sp_arc_finish(SPArcContext *ac)
 432 {
 433     ac->_message_context->clear();
 434
 435     if (ac->item != NULL) {
 436         SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
 437
 438         SP_OBJECT(ac->item)->updateRepr();
 439
 440         sp_canvas_end_forced_full_redraws(desktop->canvas);
 441
 442         sp_desktop_selection(desktop)->set(ac->item);
 443         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_ARC,
 444                          _("Create ellipse"));
 445
 446         ac->item = NULL;
 447     }
 448 }
 449
 450
 451 /*
 452   Local Variables:
 453   mode:c++
 454   c-file-style:"stroustrup"
 455   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 456   indent-tabs-mode:nil
 457   fill-column:99
 458   End:
 459 */
 460 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :