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 "sp-metrics.h"
  34 #include "xml/repr.h"
  35 #include "xml/node-event-vector.h"
  36 #include "object-edit.h"
  37 #include "prefs-utils.h"
  38 #include "message-context.h"
  39 #include "desktop.h"
  40 #include "desktop-style.h"
  41 #include "context-fns.h"
  42
  43 #include "arc-context.h"
  44
  45 static void sp_arc_context_class_init(SPArcContextClass *klass);
  46 static void sp_arc_context_init(SPArcContext *arc_context);
  47 static void sp_arc_context_dispose(GObject *object);
  48
  49 static void sp_arc_context_setup(SPEventContext *ec);
  50 static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  51 static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  52
  53 static void sp_arc_drag(SPArcContext *ec, NR::Point pt, guint state);
  54 static void sp_arc_finish(SPArcContext *ec);
  55
  56 static SPEventContextClass *parent_class;
  57
  58 GtkType sp_arc_context_get_type()
  59 {
  60     static GType type = 0;
  61     if (!type) {
  62         GTypeInfo info = {
  63             sizeof(SPArcContextClass),
  64             NULL, NULL,
  65             (GClassInitFunc) sp_arc_context_class_init,
  66             NULL, NULL,
  67             sizeof(SPArcContext),
  68             4,
  69             (GInstanceInitFunc) sp_arc_context_init,
  70             NULL,   /* value_table */
  71         };
  72         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPArcContext", &info, (GTypeFlags) 0);
  73     }
  74     return type;
  75 }
  76
  77 static void sp_arc_context_class_init(SPArcContextClass *klass)
  78 {
  79
  80     GObjectClass *object_class = (GObjectClass *) klass;
  81     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  82
  83     parent_class = (SPEventContextClass*) g_type_class_peek_parent(klass);
  84
  85     object_class->dispose = sp_arc_context_dispose;
  86
  87     event_context_class->setup = sp_arc_context_setup;
  88     event_context_class->root_handler = sp_arc_context_root_handler;
  89     event_context_class->item_handler = sp_arc_context_item_handler;
  90 }
  91
  92 static void sp_arc_context_init(SPArcContext *arc_context)
  93 {
  94     SPEventContext *event_context = SP_EVENT_CONTEXT(arc_context);
  95
  96     event_context->cursor_shape = cursor_ellipse_xpm;
  97     event_context->hot_x = 4;
  98     event_context->hot_y = 4;
  99     event_context->xp = 0;
 100     event_context->yp = 0;
 101     event_context->tolerance = 0;
 102     event_context->within_tolerance = false;
 103     event_context->item_to_select = NULL;
 104
 105     event_context->shape_repr = NULL;
 106     event_context->shape_knot_holder = NULL;
 107
 108     arc_context->item = NULL;
 109
 110     new (&arc_context->sel_changed_connection) sigc::connection();
 111 }
 112
 113 static void sp_arc_context_dispose(GObject *object)
 114 {
 115     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 116     SPArcContext *ac = SP_ARC_CONTEXT(object);
 117
 118     ec->enableGrDrag(false);
 119
 120     ac->sel_changed_connection.disconnect();
 121     ac->sel_changed_connection.~connection();
 122
 123     if (ec->shape_knot_holder) {
 124         sp_knot_holder_destroy(ec->shape_knot_holder);
 125         ec->shape_knot_holder = NULL;
 126     }
 127
 128     if (ec->shape_repr) { // remove old listener
 129         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 130         Inkscape::GC::release(ec->shape_repr);
 131         ec->shape_repr = 0;
 132     }
 133
 134     /* fixme: This is necessary because we do not grab */
 135     if (ac->item) {
 136         sp_arc_finish(ac);
 137     }
 138
 139     delete ac->_message_context;
 140
 141     G_OBJECT_CLASS(parent_class)->dispose(object);
 142 }
 143
 144 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
 145     NULL, /* child_added */
 146     NULL, /* child_removed */
 147     ec_shape_event_attr_changed,
 148     NULL, /* content_changed */
 149     NULL  /* order_changed */
 150 };
 151
 152 /**
 153 \brief  Callback that processes the "changed" signal on the selection;
 154 destroys old and creates new knotholder.
 155 */
 156 void sp_arc_context_selection_changed(Inkscape::Selection * selection, gpointer data)
 157 {
 158     SPArcContext *ac = SP_ARC_CONTEXT(data);
 159     SPEventContext *ec = SP_EVENT_CONTEXT(ac);
 160
 161     if (ec->shape_knot_holder) { // desktroy knotholder
 162         sp_knot_holder_destroy(ec->shape_knot_holder);
 163         ec->shape_knot_holder = NULL;
 164     }
 165
 166     if (ec->shape_repr) { // remove old listener
 167         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 168         Inkscape::GC::release(ec->shape_repr);
 169         ec->shape_repr = 0;
 170     }
 171
 172     SPItem *item = selection ? selection->singleItem() : NULL;
 173     if (item) {
 174         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 175         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 176         if (shape_repr) {
 177             ec->shape_repr = shape_repr;
 178             Inkscape::GC::anchor(shape_repr);
 179             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 180         }
 181     }
 182 }
 183
 184 static void sp_arc_context_setup(SPEventContext *ec)
 185 {
 186     SPArcContext *ac = SP_ARC_CONTEXT(ec);
 187     Inkscape::Selection *selection = SP_DT_SELECTION(ec->desktop);
 188
 189     if (((SPEventContextClass *) parent_class)->setup) {
 190         ((SPEventContextClass *) parent_class)->setup(ec);
 191     }
 192
 193     SPItem *item = selection->singleItem();
 194
 195     if (item) {
 196         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 197         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 198         if (shape_repr) {
 199             ec->shape_repr = shape_repr;
 200             Inkscape::GC::anchor(shape_repr);
 201             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 202         }
 203     }
 204
 205     ac->sel_changed_connection.disconnect();
 206     ac->sel_changed_connection = selection->connectChanged(
 207         sigc::bind(sigc::ptr_fun(&sp_arc_context_selection_changed), (gpointer) ac)
 208         );
 209
 210     if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
 211         ec->enableSelectionCue();
 212     }
 213
 214     if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
 215         ec->enableGrDrag();
 216     }
 217
 218     ac->_message_context = new Inkscape::MessageContext(ec->desktop->messageStack());
 219 }
 220
 221 static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 222 {
 223     SPDesktop *desktop = event_context->desktop;
 224     gint ret = FALSE;
 225
 226     switch (event->type) {
 227         case GDK_BUTTON_PRESS:
 228             if (event->button.button == 1) {
 229                 Inkscape::setup_for_drag_start(desktop, event_context, event);
 230                 ret = TRUE;
 231             }
 232             break;
 233             // motion and release are always on root (why?)
 234         default:
 235             break;
 236     }
 237
 238     if (((SPEventContextClass *) parent_class)->item_handler) {
 239         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 240     }
 241
 242     return ret;
 243 }
 244
 245 static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 246 {
 247     static bool dragging;
 248
 249     SPDesktop *desktop = event_context->desktop;
 250     Inkscape::Selection *selection = SP_DT_SELECTION(desktop);
 251     SPArcContext *ac = SP_ARC_CONTEXT(event_context);
 252
 253     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 254
 255     gint ret = FALSE;
 256
 257     switch (event->type) {
 258         case GDK_BUTTON_PRESS:
 259             if (event->button.button == 1) {
 260
 261                 dragging = true;
 262                 ac->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
 263
 264                 SnapManager const m(desktop->namedview);
 265                 ac->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT, ac->center, ac->item).getPoint();
 266                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 267                                     GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
 268                                     GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK,
 269                                     NULL, event->button.time);
 270                 ret = TRUE;
 271             }
 272             break;
 273         case GDK_MOTION_NOTIFY:
 274             if (dragging && event->motion.state && GDK_BUTTON1_MASK) {
 275
 276                 if ( event_context->within_tolerance
 277                      && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 278                      && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 279                     break; // do not drag if we're within tolerance from origin
 280                 }
 281                 // Once the user has moved farther than tolerance from the original location
 282                 // (indicating they intend to draw, not click), then always process the
 283                 // motion notify coordinates as given (no snapping back to origin)
 284                 event_context->within_tolerance = false;
 285
 286                 NR::Point const motion_w(event->motion.x, event->motion.y);
 287                 NR::Point const motion_dt(desktop->w2d(motion_w));
 288                 sp_arc_drag(ac, motion_dt, event->motion.state);
 289                 ret = TRUE;
 290             }
 291             break;
 292         case GDK_BUTTON_RELEASE:
 293             event_context->xp = event_context->yp = 0;
 294             if (event->button.button == 1) {
 295                 dragging = false;
 296                 if (!event_context->within_tolerance) {
 297                     // we've been dragging, finish the arc
 298                     sp_arc_finish(ac);
 299                 } else if (event_context->item_to_select) {
 300                     // no dragging, select clicked item if any
 301                     if (event->button.state & GDK_SHIFT_MASK) {
 302                         selection->toggle(event_context->item_to_select);
 303                     } else {
 304                         selection->set(event_context->item_to_select);
 305                     }
 306                 } else {
 307                     // click in an empty space
 308                     selection->clear();
 309                 }
 310                 event_context->xp = 0;
 311                 event_context->yp = 0;
 312                 event_context->item_to_select = NULL;
 313                 ret = TRUE;
 314             }
 315             sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
 316             break;
 317         case GDK_KEY_PRESS:
 318             switch (get_group0_keyval (&event->key)) {
 319                 case GDK_Alt_L:
 320                 case GDK_Alt_R:
 321                 case GDK_Control_L:
 322                 case GDK_Control_R:
 323                 case GDK_Shift_L:
 324                 case GDK_Shift_R:
 325                 case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 326                 case GDK_Meta_R:
 327                     sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
 328                                                _("<b>Ctrl</b>: make circle or integer-ratio ellipse, snap arc/segment angle"),
 329                                                _("<b>Shift</b>: draw around the starting point"),
 330                                                NULL);
 331                     break;
 332                 case GDK_Up:
 333                 case GDK_Down:
 334                 case GDK_KP_Up:
 335                 case GDK_KP_Down:
 336                     // prevent the zoom field from activation
 337                     if (!MOD__CTRL_ONLY)
 338                         ret = TRUE;
 339                     break;
 340                 case GDK_x:
 341                 case GDK_X:
 342                     if (MOD__ALT_ONLY) {
 343                         desktop->setToolboxFocusTo ("altx-arc");
 344                         ret = TRUE;
 345                     }
 346                     break;
 347                 case GDK_Escape:
 348                     SP_DT_SELECTION(desktop)->clear();
 349                     //TODO: make dragging escapable by Esc
 350                 default:
 351                     break;
 352             }
 353             break;
 354         case GDK_KEY_RELEASE:
 355             switch (event->key.keyval) {
 356                 case GDK_Alt_L:
 357                 case GDK_Alt_R:
 358                 case GDK_Control_L:
 359                 case GDK_Control_R:
 360                 case GDK_Shift_L:
 361                 case GDK_Shift_R:
 362                 case GDK_Meta_L:  // Meta is when you press Shift+Alt
 363                 case GDK_Meta_R:
 364                     event_context->defaultMessageContext()->clear();
 365                     break;
 366                 default:
 367                     break;
 368             }
 369             break;
 370         default:
 371             break;
 372     }
 373
 374     if (!ret) {
 375         if (((SPEventContextClass *) parent_class)->root_handler) {
 376             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 377         }
 378     }
 379
 380     return ret;
 381 }
 382
 383 static void sp_arc_drag(SPArcContext *ac, NR::Point pt, guint state)
 384 {
 385     SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
 386
 387     if (!ac->item) {
 388
 389         if (Inkscape::have_viable_layer(desktop, ac->_message_context) == false) {
 390             return;
 391         }
 392
 393         /* Create object */
 394         Inkscape::XML::Node *repr = sp_repr_new("svg:path");
 395         repr->setAttribute("sodipodi:type", "arc");
 396
 397         /* Set style */
 398         sp_desktop_apply_style_tool(desktop, repr, "tools.shapes.arc", false);
 399
 400         ac->item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 401         Inkscape::GC::release(repr);
 402         ac->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 403         ac->item->updateRepr();
 404     }
 405
 406     NR::Rect const r = Inkscape::snap_rectangular_box(desktop, ac->item, pt, ac->center, state);
 407
 408     sp_arc_position_set(SP_ARC(ac->item),
 409                         r.midpoint()[NR::X], r.midpoint()[NR::Y],
 410                         r.dimensions()[NR::X] / 2, r.dimensions()[NR::Y] / 2);
 411
 412     GString *xs = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::X], desktop->namedview->getDefaultMetric());
 413     GString *ys = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::Y], desktop->namedview->getDefaultMetric());
 414     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);
 415     g_string_free(xs, FALSE);
 416     g_string_free(ys, FALSE);
 417 }
 418
 419 static void sp_arc_finish(SPArcContext *ac)
 420 {
 421     ac->_message_context->clear();
 422
 423     if (ac->item != NULL) {
 424         SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
 425
 426         SP_OBJECT(ac->item)->updateRepr();
 427
 428         SP_DT_SELECTION(desktop)->set(ac->item);
 429         sp_document_done(SP_DT_DOCUMENT(desktop));
 430
 431         ac->item = NULL;
 432     }
 433 }
 434
 435
 436 /*
 437   Local Variables:
 438   mode:c++
 439   c-file-style:"stroustrup"
 440   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 441   indent-tabs-mode:nil
 442   fill-column:99
 443   End:
 444 */
 445 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :