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) 2000-2002 Lauris Kaplinski
  12  * Copyright (C) 2000-2001 Ximian, Inc.
  13  * Copyright (C) 2002 Mitsuru Oka
  14  *
  15  * Released under GNU GPL, read the file 'COPYING' for more information
  16  */
  17
  18 #ifdef HAVE_CONFIG_H
  19 # include <config.h>
  20 #endif
  21 #include <gdk/gdkkeysyms.h>
  22
  23 #include "macros.h"
  24 #include <glibmm/i18n.h>
  25 #include "display/sp-canvas.h"
  26 #include "sp-ellipse.h"
  27 #include "document.h"
  28 #include "sp-namedview.h"
  29 #include "selection.h"
  30 #include "desktop-handles.h"
  31 #include "snap.h"
  32 #include "pixmaps/cursor-ellipse.xpm"
  33 #include "pixmaps/cursor-ellipse.pixbuf"
  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->cursor_pixbuf = gdk_pixbuf_new_from_inline(
 100             -1,
 101             cursor_ellipse_pixbuf,
 102             FALSE,
 103             NULL);
 104     event_context->hot_x = 4;
 105     event_context->hot_y = 4;
 106     event_context->xp = 0;
 107     event_context->yp = 0;
 108     event_context->tolerance = 0;
 109     event_context->within_tolerance = false;
 110     event_context->item_to_select = NULL;
 111
 112     event_context->shape_repr = NULL;
 113     event_context->shape_knot_holder = NULL;
 114
 115     arc_context->item = NULL;
 116
 117     new (&arc_context->sel_changed_connection) sigc::connection();
 118 }
 119
 120 static void sp_arc_context_dispose(GObject *object)
 121 {
 122     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 123     SPArcContext *ac = SP_ARC_CONTEXT(object);
 124
 125     ec->enableGrDrag(false);
 126
 127     ac->sel_changed_connection.disconnect();
 128     ac->sel_changed_connection.~connection();
 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     /* fixme: This is necessary because we do not grab */
 142     if (ac->item) {
 143         sp_arc_finish(ac);
 144     }
 145
 146     delete ac->_message_context;
 147
 148     G_OBJECT_CLASS(parent_class)->dispose(object);
 149 }
 150
 151 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
 152     NULL, /* child_added */
 153     NULL, /* child_removed */
 154     ec_shape_event_attr_changed,
 155     NULL, /* content_changed */
 156     NULL  /* order_changed */
 157 };
 158
 159 /**
 160 \brief  Callback that processes the "changed" signal on the selection;
 161 destroys old and creates new knotholder.
 162 */
 163 void sp_arc_context_selection_changed(Inkscape::Selection * selection, gpointer data)
 164 {
 165     SPArcContext *ac = SP_ARC_CONTEXT(data);
 166     SPEventContext *ec = SP_EVENT_CONTEXT(ac);
 167
 168     if (ec->shape_knot_holder) { // desktroy knotholder
 169         sp_knot_holder_destroy(ec->shape_knot_holder);
 170         ec->shape_knot_holder = NULL;
 171     }
 172
 173     if (ec->shape_repr) { // remove old listener
 174         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 175         Inkscape::GC::release(ec->shape_repr);
 176         ec->shape_repr = 0;
 177     }
 178
 179     SPItem *item = selection ? selection->singleItem() : NULL;
 180     if (item) {
 181         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 182         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 183         if (shape_repr) {
 184             ec->shape_repr = shape_repr;
 185             Inkscape::GC::anchor(shape_repr);
 186             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 187         }
 188     }
 189 }
 190
 191 static void sp_arc_context_setup(SPEventContext *ec)
 192 {
 193     SPArcContext *ac = SP_ARC_CONTEXT(ec);
 194     Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
 195
 196     if (((SPEventContextClass *) parent_class)->setup) {
 197         ((SPEventContextClass *) parent_class)->setup(ec);
 198     }
 199
 200     SPItem *item = selection->singleItem();
 201
 202     if (item) {
 203         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 204         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 205         if (shape_repr) {
 206             ec->shape_repr = shape_repr;
 207             Inkscape::GC::anchor(shape_repr);
 208             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 209         }
 210     }
 211
 212     ac->sel_changed_connection.disconnect();
 213     ac->sel_changed_connection = selection->connectChanged(
 214         sigc::bind(sigc::ptr_fun(&sp_arc_context_selection_changed), (gpointer) ac)
 215         );
 216
 217     if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
 218         ec->enableSelectionCue();
 219     }
 220
 221     if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
 222         ec->enableGrDrag();
 223     }
 224
 225     ac->_message_context = new Inkscape::MessageContext(ec->desktop->messageStack());
 226 }
 227
 228 static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 229 {
 230     SPDesktop *desktop = event_context->desktop;
 231     gint ret = FALSE;
 232
 233     switch (event->type) {
 234         case GDK_BUTTON_PRESS:
 235             if (event->button.button == 1) {
 236                 Inkscape::setup_for_drag_start(desktop, event_context, event);
 237                 ret = TRUE;
 238             }
 239             break;
 240             // motion and release are always on root (why?)
 241         default:
 242             break;
 243     }
 244
 245     if (((SPEventContextClass *) parent_class)->item_handler) {
 246         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 247     }
 248
 249     return ret;
 250 }
 251
 252 static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 253 {
 254     static bool dragging;
 255
 256     SPDesktop *desktop = event_context->desktop;
 257     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 258     SPArcContext *ac = SP_ARC_CONTEXT(event_context);
 259
 260     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 261
 262     gint ret = FALSE;
 263
 264     switch (event->type) {
 265         case GDK_BUTTON_PRESS:
 266             if (event->button.button == 1) {
 267
 268                 dragging = true;
 269                 ac->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
 270
 271                 SnapManager const &m = desktop->namedview->snap_manager;
 272                 ac->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT, ac->center, ac->item).getPoint();
 273                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 274                                     GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
 275                                     GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK,
 276                                     NULL, event->button.time);
 277                 ret = TRUE;
 278             }
 279             break;
 280         case GDK_MOTION_NOTIFY:
 281             if (dragging && event->motion.state && GDK_BUTTON1_MASK) {
 282
 283                 if ( event_context->within_tolerance
 284                      && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 285                      && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 286                     break; // do not drag if we're within tolerance from origin
 287                 }
 288                 // Once the user has moved farther than tolerance from the original location
 289                 // (indicating they intend to draw, not click), then always process the
 290                 // motion notify coordinates as given (no snapping back to origin)
 291                 event_context->within_tolerance = false;
 292
 293                 NR::Point const motion_w(event->motion.x, event->motion.y);
 294                 NR::Point const motion_dt(desktop->w2d(motion_w));
 295                 sp_arc_drag(ac, motion_dt, event->motion.state);
 296                 ret = TRUE;
 297             }
 298             break;
 299         case GDK_BUTTON_RELEASE:
 300             event_context->xp = event_context->yp = 0;
 301             if (event->button.button == 1) {
 302                 dragging = false;
 303                 if (!event_context->within_tolerance) {
 304                     // we've been dragging, finish the arc
 305                     sp_arc_finish(ac);
 306                 } else if (event_context->item_to_select) {
 307                     // no dragging, select clicked item if any
 308                     if (event->button.state & GDK_SHIFT_MASK) {
 309                         selection->toggle(event_context->item_to_select);
 310                     } else {
 311                         selection->set(event_context->item_to_select);
 312                     }
 313                 } else {
 314                     // click in an empty space
 315                     selection->clear();
 316                 }
 317                 event_context->xp = 0;
 318                 event_context->yp = 0;
 319                 event_context->item_to_select = NULL;
 320                 ret = TRUE;
 321             }
 322             sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
 323             break;
 324         case GDK_KEY_PRESS:
 325             switch (get_group0_keyval (&event->key)) {
 326                 case GDK_Alt_L:
 327                 case GDK_Alt_R:
 328                 case GDK_Control_L:
 329                 case GDK_Control_R:
 330                 case GDK_Shift_L:
 331                 case GDK_Shift_R:
 332                 case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 333                 case GDK_Meta_R:
 334                     sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
 335                                                _("<b>Ctrl</b>: make circle or integer-ratio ellipse, snap arc/segment angle"),
 336                                                _("<b>Shift</b>: draw around the starting point"),
 337                                                NULL);
 338                     break;
 339                 case GDK_Up:
 340                 case GDK_Down:
 341                 case GDK_KP_Up:
 342                 case GDK_KP_Down:
 343                     // prevent the zoom field from activation
 344                     if (!MOD__CTRL_ONLY)
 345                         ret = TRUE;
 346                     break;
 347                 case GDK_x:
 348                 case GDK_X:
 349                     if (MOD__ALT_ONLY) {
 350                         desktop->setToolboxFocusTo ("altx-arc");
 351                         ret = TRUE;
 352                     }
 353                     break;
 354                 case GDK_Escape:
 355                     sp_desktop_selection(desktop)->clear();
 356                     //TODO: make dragging escapable by Esc
 357                 default:
 358                     break;
 359             }
 360             break;
 361         case GDK_KEY_RELEASE:
 362             switch (event->key.keyval) {
 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
 370                 case GDK_Meta_R:
 371                     event_context->defaultMessageContext()->clear();
 372                     break;
 373                 default:
 374                     break;
 375             }
 376             break;
 377         default:
 378             break;
 379     }
 380
 381     if (!ret) {
 382         if (((SPEventContextClass *) parent_class)->root_handler) {
 383             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 384         }
 385     }
 386
 387     return ret;
 388 }
 389
 390 static void sp_arc_drag(SPArcContext *ac, NR::Point pt, guint state)
 391 {
 392     SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
 393
 394     if (!ac->item) {
 395
 396         if (Inkscape::have_viable_layer(desktop, ac->_message_context) == false) {
 397             return;
 398         }
 399
 400         /* Create object */
 401         Inkscape::XML::Node *repr = sp_repr_new("svg:path");
 402         repr->setAttribute("sodipodi:type", "arc");
 403
 404         /* Set style */
 405         sp_desktop_apply_style_tool(desktop, repr, "tools.shapes.arc", false);
 406
 407         ac->item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 408         Inkscape::GC::release(repr);
 409         ac->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 410         ac->item->updateRepr();
 411     }
 412
 413     NR::Rect const r = Inkscape::snap_rectangular_box(desktop, ac->item, pt, ac->center, state);
 414
 415     sp_arc_position_set(SP_ARC(ac->item),
 416                         r.midpoint()[NR::X], r.midpoint()[NR::Y],
 417                         r.dimensions()[NR::X] / 2, r.dimensions()[NR::Y] / 2);
 418
 419     GString *xs = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::X], desktop->namedview->getDefaultMetric());
 420     GString *ys = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::Y], desktop->namedview->getDefaultMetric());
 421     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);
 422     g_string_free(xs, FALSE);
 423     g_string_free(ys, FALSE);
 424 }
 425
 426 static void sp_arc_finish(SPArcContext *ac)
 427 {
 428     ac->_message_context->clear();
 429
 430     if (ac->item != NULL) {
 431         SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
 432
 433         SP_OBJECT(ac->item)->updateRepr();
 434
 435         sp_desktop_selection(desktop)->set(ac->item);
 436         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_ARC,
 437                          _("Create ellipse"));
 438
 439         ac->item = NULL;
 440     }
 441 }
 442
 443
 444 /*
 445   Local Variables:
 446   mode:c++
 447   c-file-style:"stroustrup"
 448   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 449   indent-tabs-mode:nil
 450   fill-column:99
 451   End:
 452 */
 453 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :