src/rect-context.cpp

   1 #define __SP_RECT_CONTEXT_C__
   2
   3 /*
   4  * Rectangle drawing context
   5  *
   6  * Author:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   bulia byak <buliabyak@users.sf.net>
   9  *
  10  * Copyright (C) 2000-2005 authors
  11  * Copyright (C) 2000-2001 Ximian, Inc.
  12  *
  13  * Released under GNU GPL, read the file 'COPYING' for more information
  14  */
  15
  16 #include "config.h"
  17
  18 #include <gdk/gdkkeysyms.h>
  19
  20 #include "macros.h"
  21 #include "display/sp-canvas.h"
  22 #include "sp-rect.h"
  23 #include "document.h"
  24 #include "sp-namedview.h"
  25 #include "selection.h"
  26 #include "desktop-handles.h"
  27 #include "snap.h"
  28 #include "desktop.h"
  29 #include "desktop-style.h"
  30 #include "message-context.h"
  31 #include "pixmaps/cursor-rect.xpm"
  32 #include "rect-context.h"
  33 #include "sp-metrics.h"
  34 #include <glibmm/i18n.h>
  35 #include "object-edit.h"
  36 #include "xml/repr.h"
  37 #include "xml/node-event-vector.h"
  38 #include "prefs-utils.h"
  39 #include "context-fns.h"
  40
  41 static void sp_rect_context_class_init(SPRectContextClass *klass);
  42 static void sp_rect_context_init(SPRectContext *rect_context);
  43 static void sp_rect_context_dispose(GObject *object);
  44
  45 static void sp_rect_context_setup(SPEventContext *ec);
  46 static void sp_rect_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  47
  48 static gint sp_rect_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  49 static gint sp_rect_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  50
  51 static void sp_rect_drag(SPRectContext &rc, NR::Point const pt, guint state);
  52 static void sp_rect_finish(SPRectContext *rc);
  53
  54 static SPEventContextClass *parent_class;
  55
  56
  57 GtkType sp_rect_context_get_type()
  58 {
  59     static GType type = 0;
  60     if (!type) {
  61         GTypeInfo info = {
  62             sizeof(SPRectContextClass),
  63             NULL, NULL,
  64             (GClassInitFunc) sp_rect_context_class_init,
  65             NULL, NULL,
  66             sizeof(SPRectContext),
  67             4,
  68             (GInstanceInitFunc) sp_rect_context_init,
  69             NULL,    /* value_table */
  70         };
  71         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPRectContext", &info, (GTypeFlags) 0);
  72     }
  73     return type;
  74 }
  75
  76 static void sp_rect_context_class_init(SPRectContextClass *klass)
  77 {
  78     GObjectClass *object_class = (GObjectClass *) klass;
  79     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  80
  81     parent_class = (SPEventContextClass *) g_type_class_peek_parent(klass);
  82
  83     object_class->dispose = sp_rect_context_dispose;
  84
  85     event_context_class->setup = sp_rect_context_setup;
  86     event_context_class->set = sp_rect_context_set;
  87     event_context_class->root_handler  = sp_rect_context_root_handler;
  88     event_context_class->item_handler  = sp_rect_context_item_handler;
  89 }
  90
  91 static void sp_rect_context_init(SPRectContext *rect_context)
  92 {
  93     SPEventContext *event_context = SP_EVENT_CONTEXT(rect_context);
  94
  95     event_context->cursor_shape = cursor_rect_xpm;
  96     event_context->hot_x = 4;
  97     event_context->hot_y = 4;
  98     event_context->xp = 0;
  99     event_context->yp = 0;
 100     event_context->tolerance = 0;
 101     event_context->within_tolerance = false;
 102     event_context->item_to_select = NULL;
 103
 104     event_context->shape_repr = NULL;
 105     event_context->shape_knot_holder = NULL;
 106
 107     rect_context->item = NULL;
 108
 109     rect_context->rx = 0.0;
 110     rect_context->ry = 0.0;
 111
 112     new (&rect_context->sel_changed_connection) sigc::connection();
 113 }
 114
 115 static void sp_rect_context_dispose(GObject *object)
 116 {
 117     SPRectContext *rc = SP_RECT_CONTEXT(object);
 118     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 119
 120     ec->enableGrDrag(false);
 121
 122     rc->sel_changed_connection.disconnect();
 123     rc->sel_changed_connection.~connection();
 124
 125     /* fixme: This is necessary because we do not grab */
 126     if (rc->item) {
 127         sp_rect_finish(rc);
 128     }
 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     if (rc->_message_context) {
 142         delete rc->_message_context;
 143     }
 144
 145     G_OBJECT_CLASS(parent_class)->dispose(object);
 146 }
 147
 148 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
 149     NULL, /* child_added */
 150     NULL, /* child_removed */
 151     ec_shape_event_attr_changed,
 152     NULL, /* content_changed */
 153     NULL  /* order_changed */
 154 };
 155
 156 /**
 157 \brief  Callback that processes the "changed" signal on the selection;
 158 destroys old and creates new knotholder
 159 */
 160 void sp_rect_context_selection_changed(Inkscape::Selection *selection, gpointer data)
 161 {
 162     SPRectContext *rc = SP_RECT_CONTEXT(data);
 163     SPEventContext *ec = SP_EVENT_CONTEXT(rc);
 164
 165     if (ec->shape_knot_holder) { // destroy knotholder
 166         sp_knot_holder_destroy(ec->shape_knot_holder);
 167         ec->shape_knot_holder = NULL;
 168     }
 169
 170     if (ec->shape_repr) { // remove old listener
 171         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 172         Inkscape::GC::release(ec->shape_repr);
 173         ec->shape_repr = 0;
 174     }
 175
 176     SPItem *item = selection->singleItem();
 177     if (item) {
 178         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 179         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 180         if (shape_repr) {
 181             ec->shape_repr = shape_repr;
 182             Inkscape::GC::anchor(shape_repr);
 183             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 184             sp_repr_synthesize_events(shape_repr, &ec_shape_repr_events, ec);
 185         }
 186     }
 187 }
 188
 189 static void sp_rect_context_setup(SPEventContext *ec)
 190 {
 191     SPRectContext *rc = SP_RECT_CONTEXT(ec);
 192
 193     if (((SPEventContextClass *) parent_class)->setup) {
 194         ((SPEventContextClass *) parent_class)->setup(ec);
 195     }
 196
 197     SPItem *item = SP_DT_SELECTION(ec->desktop)->singleItem();
 198     if (item) {
 199         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 200         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 201         if (shape_repr) {
 202             ec->shape_repr = shape_repr;
 203             Inkscape::GC::anchor(shape_repr);
 204             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 205             sp_repr_synthesize_events(shape_repr, &ec_shape_repr_events, ec);
 206         }
 207     }
 208
 209     rc->sel_changed_connection.disconnect();
 210     rc->sel_changed_connection = SP_DT_SELECTION(ec->desktop)->connectChanged(
 211         sigc::bind(sigc::ptr_fun(&sp_rect_context_selection_changed), (gpointer)rc)
 212     );
 213
 214     sp_event_context_read(ec, "rx");
 215     sp_event_context_read(ec, "ry");
 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     rc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 226 }
 227
 228 static void sp_rect_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 229 {
 230     SPRectContext *rc = SP_RECT_CONTEXT(ec);
 231
 232     /* fixme: Proper error handling for non-numeric data.  Use a locale-independent function like
 233      * g_ascii_strtod (or a thin wrapper that does the right thing for invalid values inf/nan). */
 234     if ( strcmp(key, "rx") == 0 ) {
 235         rc->rx = ( val
 236                          ? g_ascii_strtod (val, NULL)
 237                          : 0.0 );
 238     } else if ( strcmp(key, "ry") == 0 ) {
 239         rc->ry = ( val
 240                          ? g_ascii_strtod (val, NULL)
 241                          : 0.0 );
 242     }
 243 }
 244
 245 static gint sp_rect_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 246 {
 247     SPDesktop *desktop = event_context->desktop;
 248
 249     gint ret = FALSE;
 250
 251     switch (event->type) {
 252     case GDK_BUTTON_PRESS:
 253         if ( event->button.button == 1 ) {
 254             Inkscape::setup_for_drag_start(desktop, event_context, event);
 255             ret = TRUE;
 256         }
 257         break;
 258         // motion and release are always on root (why?)
 259     default:
 260         break;
 261     }
 262
 263     if (((SPEventContextClass *) parent_class)->item_handler) {
 264         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 265     }
 266
 267     return ret;
 268 }
 269
 270 static gint sp_rect_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 271 {
 272     static bool dragging;
 273
 274     SPDesktop *desktop = event_context->desktop;
 275     Inkscape::Selection *selection = SP_DT_SELECTION (desktop);
 276
 277     SPRectContext *rc = SP_RECT_CONTEXT(event_context);
 278
 279     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 280
 281     gint ret = FALSE;
 282     switch (event->type) {
 283     case GDK_BUTTON_PRESS:
 284         if ( event->button.button == 1 ) {
 285             NR::Point const button_w(event->button.x,
 286                                      event->button.y);
 287
 288             // save drag origin
 289             event_context->xp = (gint) button_w[NR::X];
 290             event_context->yp = (gint) button_w[NR::Y];
 291             event_context->within_tolerance = true;
 292
 293             // remember clicked item, disregarding groups, honoring Alt
 294             event_context->item_to_select = sp_event_context_find_item (desktop, button_w, event->button.state & GDK_MOD1_MASK, TRUE);
 295
 296             dragging = true;
 297
 298             /* Position center */
 299             NR::Point const button_dt(desktop->w2d(button_w));
 300
 301             /* Snap center */
 302             SnapManager const m(desktop->namedview);
 303             rc->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT | Inkscape::Snapper::BBOX_POINT,
 304                                     button_dt, rc->item).getPoint();
 305
 306             sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 307                                 ( GDK_KEY_PRESS_MASK |
 308                                   GDK_BUTTON_RELEASE_MASK       |
 309                                   GDK_POINTER_MOTION_MASK       |
 310                                   GDK_POINTER_MOTION_HINT_MASK  |
 311                                   GDK_BUTTON_PRESS_MASK ),
 312                                 NULL, event->button.time);
 313             ret = TRUE;
 314         }
 315         break;
 316     case GDK_MOTION_NOTIFY:
 317         if ( dragging
 318              && ( event->motion.state & GDK_BUTTON1_MASK ) )
 319         {
 320             if ( event_context->within_tolerance
 321                  && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 322                  && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 323                 break; // do not drag if we're within tolerance from origin
 324             }
 325             // Once the user has moved farther than tolerance from the original location
 326             // (indicating they intend to draw, not click), then always process the
 327             // motion notify coordinates as given (no snapping back to origin)
 328             event_context->within_tolerance = false;
 329
 330             NR::Point const motion_w(event->motion.x,
 331                                      event->motion.y);
 332             NR::Point const motion_dt(desktop->w2d(motion_w));
 333             sp_rect_drag(*rc, motion_dt, event->motion.state);
 334             ret = TRUE;
 335         }
 336         break;
 337     case GDK_BUTTON_RELEASE:
 338         event_context->xp = event_context->yp = 0;
 339         if ( event->button.button == 1 ) {
 340             dragging = false;
 341
 342             if (!event_context->within_tolerance) {
 343                 // we've been dragging, finish the rect
 344                 sp_rect_finish(rc);
 345             } else if (event_context->item_to_select) {
 346                 // no dragging, select clicked item if any
 347                 if (event->button.state & GDK_SHIFT_MASK) {
 348                     selection->toggle(event_context->item_to_select);
 349                 } else {
 350                     selection->set(event_context->item_to_select);
 351                 }
 352             } else {
 353                 // click in an empty space
 354                 selection->clear();
 355             }
 356
 357             event_context->item_to_select = NULL;
 358             ret = TRUE;
 359             sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
 360                                   event->button.time);
 361         }
 362         break;
 363     case GDK_KEY_PRESS:
 364         switch (get_group0_keyval (&event->key)) {
 365         case GDK_Alt_L:
 366         case GDK_Alt_R:
 367         case GDK_Control_L:
 368         case GDK_Control_R:
 369         case GDK_Shift_L:
 370         case GDK_Shift_R:
 371         case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 372         case GDK_Meta_R:
 373             sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
 374                                         _("<b>Ctrl</b>: make square or integer-ratio rect, lock a rounded corner circular"),
 375                                         _("<b>Shift</b>: draw around the starting point"),
 376                                         NULL);
 377             break;
 378         case GDK_Up:
 379         case GDK_Down:
 380         case GDK_KP_Up:
 381         case GDK_KP_Down:
 382             // prevent the zoom field from activation
 383             if (!MOD__CTRL_ONLY)
 384                 ret = TRUE;
 385             break;
 386
 387         case GDK_x:
 388         case GDK_X:
 389             if (MOD__ALT_ONLY) {
 390                 desktop->setToolboxFocusTo ("altx-rect");
 391                 ret = TRUE;
 392             }
 393             break;
 394
 395         case GDK_Escape:
 396             SP_DT_SELECTION(desktop)->clear();
 397             //TODO: make dragging escapable by Esc
 398         default:
 399             break;
 400         }
 401         break;
 402     case GDK_KEY_RELEASE:
 403         switch (get_group0_keyval (&event->key)) {
 404         case GDK_Alt_L:
 405         case GDK_Alt_R:
 406         case GDK_Control_L:
 407         case GDK_Control_R:
 408         case GDK_Shift_L:
 409         case GDK_Shift_R:
 410         case GDK_Meta_L:  // Meta is when you press Shift+Alt
 411         case GDK_Meta_R:
 412             event_context->defaultMessageContext()->clear();
 413             break;
 414         default:
 415             break;
 416         }
 417         break;
 418     default:
 419         break;
 420     }
 421
 422     if (!ret) {
 423         if (((SPEventContextClass *) parent_class)->root_handler) {
 424             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 425         }
 426     }
 427
 428     return ret;
 429 }
 430
 431 static void sp_rect_drag(SPRectContext &rc, NR::Point const pt, guint state)
 432 {
 433     SPDesktop *desktop = SP_EVENT_CONTEXT(&rc)->desktop;
 434
 435     if (!rc.item) {
 436
 437         if (Inkscape::have_viable_layer(desktop, rc._message_context) == false) {
 438             return;
 439         }
 440
 441         /* Create object */
 442         Inkscape::XML::Node *repr = sp_repr_new("svg:rect");
 443
 444         /* Set style */
 445         sp_desktop_apply_style_tool (desktop, repr, "tools.shapes.rect", false);
 446
 447         rc.item = (SPItem *) desktop->currentLayer()->appendChildRepr(repr);
 448         Inkscape::GC::release(repr);
 449         rc.item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 450         rc.item->updateRepr();
 451     }
 452
 453     NR::Rect const r = Inkscape::snap_rectangular_box(desktop, rc.item, pt, rc.center, state);
 454
 455     sp_rect_position_set(SP_RECT(rc.item), r.min()[NR::X], r.min()[NR::Y], r.dimensions()[NR::X], r.dimensions()[NR::Y]);
 456     if ( rc.rx != 0.0 ) {
 457         sp_rect_set_rx (SP_RECT(rc.item), TRUE, rc.rx);
 458     }
 459     if ( rc.ry != 0.0 ) {
 460         if (rc.rx == 0.0)
 461             sp_rect_set_ry (SP_RECT(rc.item), TRUE, CLAMP(rc.ry, 0, MIN(r.dimensions()[NR::X], r.dimensions()[NR::Y])/2));
 462         else
 463             sp_rect_set_ry (SP_RECT(rc.item), TRUE, CLAMP(rc.ry, 0, r.dimensions()[NR::Y]));
 464     }
 465
 466     // status text
 467     GString *xs = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::X], desktop->namedview->getDefaultMetric());
 468     GString *ys = SP_PX_TO_METRIC_STRING(r.dimensions()[NR::Y], desktop->namedview->getDefaultMetric());
 469     rc._message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>Rectangle</b>: %s &#215; %s; with <b>Ctrl</b> to make square or integer-ratio rectangle; with <b>Shift</b> to draw around the starting point"), xs->str, ys->str);
 470     g_string_free(xs, FALSE);
 471     g_string_free(ys, FALSE);
 472 }
 473
 474 static void sp_rect_finish(SPRectContext *rc)
 475 {
 476     rc->_message_context->clear();
 477
 478     if ( rc->item != NULL ) {
 479         SPDesktop * dt;
 480
 481         dt = SP_EVENT_CONTEXT_DESKTOP(rc);
 482
 483         SP_OBJECT(rc->item)->updateRepr();
 484
 485         SP_DT_SELECTION(dt)->set(rc->item);
 486         sp_document_done(SP_DT_DOCUMENT(dt));
 487
 488         rc->item = NULL;
 489     }
 490 }
 491
 492 /*
 493   Local Variables:
 494   mode:c++
 495   c-file-style:"stroustrup"
 496   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 497   indent-tabs-mode:nil
 498   fill-column:99
 499   End:
 500 */
 501 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :