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
  44 #include "arc-context.h"
  45
  46 static void sp_arc_context_class_init(SPArcContextClass *klass);
  47 static void sp_arc_context_init(SPArcContext *arc_context);
  48 static void sp_arc_context_dispose(GObject *object);
  49
  50 static void sp_arc_context_setup(SPEventContext *ec);
  51 static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  52 static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  53
  54 static void sp_arc_drag(SPArcContext *ec, NR::Point pt, guint state);
  55 static void sp_arc_finish(SPArcContext *ec);
  56
  57 static SPEventContextClass *parent_class;
  58
  59 GtkType sp_arc_context_get_type()
  60 {
  61     static GType type = 0;
  62     if (!type) {
  63         GTypeInfo info = {
  64             sizeof(SPArcContextClass),
  65             NULL, NULL,
  66             (GClassInitFunc) sp_arc_context_class_init,
  67             NULL, NULL,
  68             sizeof(SPArcContext),
  69             4,
  70             (GInstanceInitFunc) sp_arc_context_init,
  71             NULL,   /* value_table */
  72         };
  73         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPArcContext", &info, (GTypeFlags) 0);
  74     }
  75     return type;
  76 }
  77
  78 static void sp_arc_context_class_init(SPArcContextClass *klass)
  79 {
  80
  81     GObjectClass *object_class = (GObjectClass *) klass;
  82     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  83
  84     parent_class = (SPEventContextClass*) g_type_class_peek_parent(klass);
  85
  86     object_class->dispose = sp_arc_context_dispose;
  87
  88     event_context_class->setup = sp_arc_context_setup;
  89     event_context_class->root_handler = sp_arc_context_root_handler;
  90     event_context_class->item_handler = sp_arc_context_item_handler;
  91 }
  92
  93 static void sp_arc_context_init(SPArcContext *arc_context)
  94 {
  95     SPEventContext *event_context = SP_EVENT_CONTEXT(arc_context);
  96
  97     event_context->cursor_shape = cursor_ellipse_xpm;
  98     event_context->cursor_pixbuf = gdk_pixbuf_new_from_inline(
  99             -1,
 100             cursor_ellipse_pixbuf,
 101             FALSE,
 102             NULL);
 103     event_context->hot_x = 4;
 104     event_context->hot_y = 4;
 105     event_context->xp = 0;
 106     event_context->yp = 0;
 107     event_context->tolerance = 0;
 108     event_context->within_tolerance = false;
 109     event_context->item_to_select = NULL;
 110
 111     event_context->shape_repr = NULL;
 112     event_context->shape_knot_holder = NULL;
 113
 114     arc_context->item = NULL;
 115
 116     new (&arc_context->sel_changed_connection) sigc::connection();
 117 }
 118
 119 static void sp_arc_context_dispose(GObject *object)
 120 {
 121     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 122     SPArcContext *ac = SP_ARC_CONTEXT(object);
 123
 124     ec->enableGrDrag(false);
 125
 126     ac->sel_changed_connection.disconnect();
 127     ac->sel_changed_connection.~connection();
 128
 129     if (ec->shape_knot_holder) {
 130         sp_knot_holder_destroy(ec->shape_knot_holder);
 131         ec->shape_knot_holder = NULL;
 132     }
 133
 134     if (ec->shape_repr) { // remove old listener
 135         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 136         Inkscape::GC::release(ec->shape_repr);
 137         ec->shape_repr = 0;
 138     }
 139
 140     /* fixme: This is necessary because we do not grab */
 141     if (ac->item) {
 142         sp_arc_finish(ac);
 143     }
 144
 145     delete ac->_message_context;
 146
 147     G_OBJECT_CLASS(parent_class)->dispose(object);
 148 }
 149
 150 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
 151     NULL, /* child_added */
 152     NULL, /* child_removed */
 153     ec_shape_event_attr_changed,
 154     NULL, /* content_changed */
 155     NULL  /* order_changed */
 156 };
 157
 158 /**
 159 \brief  Callback that processes the "changed" signal on the selection;
 160 destroys old and creates new knotholder.
 161 */
 162 void sp_arc_context_selection_changed(Inkscape::Selection * selection, gpointer data)
 163 {
 164     SPArcContext *ac = SP_ARC_CONTEXT(data);
 165     SPEventContext *ec = SP_EVENT_CONTEXT(ac);
 166
 167     if (ec->shape_knot_holder) { // desktroy knotholder
 168         sp_knot_holder_destroy(ec->shape_knot_holder);
 169         ec->shape_knot_holder = NULL;
 170     }
 171
 172     if (ec->shape_repr) { // remove old listener
 173         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 174         Inkscape::GC::release(ec->shape_repr);
 175         ec->shape_repr = 0;
 176     }
 177
 178     SPItem *item = selection ? selection->singleItem() : NULL;
 179     if (item) {
 180         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 181         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 182         if (shape_repr) {
 183             ec->shape_repr = shape_repr;
 184             Inkscape::GC::anchor(shape_repr);
 185             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 186         }
 187     }
 188 }
 189
 190 static void sp_arc_context_setup(SPEventContext *ec)
 191 {
 192     SPArcContext *ac = SP_ARC_CONTEXT(ec);
 193     Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
 194
 195     if (((SPEventContextClass *) parent_class)->setup) {
 196         ((SPEventContextClass *) parent_class)->setup(ec);
 197     }
 198
 199     SPItem *item = selection->singleItem();
 200
 201     if (item) {
 202         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 203         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 204         if (shape_repr) {
 205             ec->shape_repr = shape_repr;
 206             Inkscape::GC::anchor(shape_repr);
 207             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 208         }
 209     }
 210
 211     ac->sel_changed_connection.disconnect();
 212     ac->sel_changed_connection = selection->connectChanged(
 213         sigc::bind(sigc::ptr_fun(&sp_arc_context_selection_changed), (gpointer) ac)
 214         );
 215
 216     if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
 217         ec->enableSelectionCue();
 218     }
 219
 220     if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
 221         ec->enableGrDrag();
 222     }
 223
 224     ac->_message_context = new Inkscape::MessageContext(ec->desktop->messageStack());
 225 }
 226
 227 static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 228 {
 229     SPDesktop *desktop = event_context->desktop;
 230     gint ret = FALSE;
 231
 232     switch (event->type) {
 233         case GDK_BUTTON_PRESS:
 234             if (event->button.button == 1) {
 235                 Inkscape::setup_for_drag_start(desktop, event_context, event);
 236                 ret = TRUE;
 237             }
 238             break;
 239             // motion and release are always on root (why?)
 240         default:
 241             break;
 242     }
 243
 244     if (((SPEventContextClass *) parent_class)->item_handler) {
 245         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 246     }
 247
 248     return ret;
 249 }
 250
 251 static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 252 {
 253     static bool dragging;
 254
 255     SPDesktop *desktop = event_context->desktop;
 256     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 257     SPArcContext *ac = SP_ARC_CONTEXT(event_context);
 258
 259     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 260
 261     gint ret = FALSE;
 262
 263     switch (event->type) {
 264         case GDK_BUTTON_PRESS:
 265             if (event->button.button == 1) {
 266
 267                 dragging = true;
 268                 ac->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
 269
 270                 SnapManager const &m = desktop->namedview->snap_manager;
 271                 ac->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT, ac->center, ac->item).getPoint();
 272                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 273                                     GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
 274                                     GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK,
 275                                     NULL, event->button.time);
 276                 ret = TRUE;
 277             }
 278             break;
 279         case GDK_MOTION_NOTIFY:
 280             if (dragging && event->motion.state && GDK_BUTTON1_MASK) {
 281
 282                 if ( event_context->within_tolerance
 283                      && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 284                      && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 285                     break; // do not drag if we're within tolerance from origin
 286                 }
 287                 // Once the user has moved farther than tolerance from the original location
 288                 // (indicating they intend to draw, not click), then always process the
 289                 // motion notify coordinates as given (no snapping back to origin)
 290                 event_context->within_tolerance = false;
 291
 292                 NR::Point const motion_w(event->motion.x, event->motion.y);
 293                 NR::Point const motion_dt(desktop->w2d(motion_w));
 294                 sp_arc_drag(ac, motion_dt, event->motion.state);
 295                 ret = TRUE;
 296             }
 297             break;
 298         case GDK_BUTTON_RELEASE:
 299             event_context->xp = event_context->yp = 0;
 300             if (event->button.button == 1) {
 301                 dragging = false;
 302                 if (!event_context->within_tolerance) {
 303                     // we've been dragging, finish the arc
 304                     sp_arc_finish(ac);
 305                 } else if (event_context->item_to_select) {
 306                     // no dragging, select clicked item if any
 307                     if (event->button.state & GDK_SHIFT_MASK) {
 308                         selection->toggle(event_context->item_to_select);
 309                     } else {
 310                         selection->set(event_context->item_to_select);
 311                     }
 312                 } else {
 313                     // click in an empty space
 314                     selection->clear();
 315                 }
 316                 event_context->xp = 0;
 317                 event_context->yp = 0;
 318                 event_context->item_to_select = NULL;
 319                 ret = TRUE;
 320             }
 321             sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
 322             break;
 323         case GDK_KEY_PRESS:
 324             switch (get_group0_keyval (&event->key)) {
 325                 case GDK_Alt_L:
 326                 case GDK_Alt_R:
 327                 case GDK_Control_L:
 328                 case GDK_Control_R:
 329                 case GDK_Shift_L:
 330                 case GDK_Shift_R:
 331                 case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 332                 case GDK_Meta_R:
 333                     sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
 334                                                _("<b>Ctrl</b>: make circle or integer-ratio ellipse, snap arc/segment angle"),
 335                                                _("<b>Shift</b>: draw around the starting point"),
 336                                                NULL);
 337                     break;
 338                 case GDK_Up:
 339                 case GDK_Down:
 340                 case GDK_KP_Up:
 341                 case GDK_KP_Down:
 342                     // prevent the zoom field from activation
 343                     if (!MOD__CTRL_ONLY)
 344                         ret = TRUE;
 345                     break;
 346                 case GDK_x:
 347                 case GDK_X:
 348                     if (MOD__ALT_ONLY) {
 349                         desktop->setToolboxFocusTo ("altx-arc");
 350                         ret = TRUE;
 351                     }
 352                     break;
 353                 case GDK_Escape:
 354                     sp_desktop_selection(desktop)->clear();
 355                     //TODO: make dragging escapable by Esc
 356                 default:
 357                     break;
 358             }
 359             break;
 360         case GDK_KEY_RELEASE:
 361             switch (event->key.keyval) {
 362                 case GDK_Alt_L:
 363                 case GDK_Alt_R:
 364                 case GDK_Control_L:
 365                 case GDK_Control_R:
 366                 case GDK_Shift_L:
 367                 case GDK_Shift_R:
 368                 case GDK_Meta_L:  // Meta is when you press Shift+Alt
 369                 case GDK_Meta_R:
 370                     event_context->defaultMessageContext()->clear();
 371                     break;
 372                 default:
 373                     break;
 374             }
 375             break;
 376         default:
 377             break;
 378     }
 379
 380     if (!ret) {
 381         if (((SPEventContextClass *) parent_class)->root_handler) {
 382             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 383         }
 384     }
 385
 386     return ret;
 387 }
 388
 389 static void sp_arc_drag(SPArcContext *ac, NR::Point pt, guint state)
 390 {
 391     SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
 392
 393     if (!ac->item) {
 394
 395         if (Inkscape::have_viable_layer(desktop, ac->_message_context) == false) {
 396             return;
 397         }
 398
 399         /* Create object */
 400         Inkscape::XML::Node *repr = sp_repr_new("svg:path");
 401         repr->setAttribute("sodipodi:type", "arc");
 402
 403         /* Set style */
 404         sp_desktop_apply_style_tool(desktop, repr, "tools.shapes.arc", false);
 405
 406         ac->item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 407         Inkscape::GC::release(repr);
 408         ac->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 409         ac->item->updateRepr();
 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_desktop_selection(desktop)->set(ac->item);
 435         sp_document_done(sp_desktop_document(desktop));
 436
 437         ac->item = NULL;
 438     }
 439 }
 440
 441
 442 /*
 443   Local Variables:
 444   mode:c++
 445   c-file-style:"stroustrup"
 446   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 447   indent-tabs-mode:nil
 448   fill-column:99
 449   End:
 450 */
 451 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :