2ab045e7e2d19d9fd742de27ebd7a3911e72d335
1 #define __SP_EVENT_CONTEXT_C__
3 /** \file
4 * Main event handling, and related helper functions.
5 *
6 * Authors:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * Frank Felfe <innerspace@iname.com>
9 * bulia byak <buliabyak@users.sf.net>
10 *
11 * Copyright (C) 1999-2005 authors
12 * Copyright (C) 2001-2002 Ximian, Inc.
13 *
14 * Released under GNU GPL, read the file 'COPYING' for more information
15 */
17 /** \class SPEventContext
18 * SPEventContext is an abstract base class of all tools. As the name
19 * indicates, event context implementations process UI events (mouse
20 * movements and keypresses) and take actions (like creating or modifying
21 * objects). There is one event context implementation for each tool,
22 * plus few abstract base classes. Writing a new tool involves
23 * subclassing SPEventContext.
24 */
26 #ifdef HAVE_CONFIG_H
27 # include "config.h"
28 #endif
30 #include <gdk/gdkkeysyms.h>
31 #include <gtk/gtkmain.h>
32 #include <gtk/gtkmenu.h>
34 #include "display/sp-canvas.h"
35 #include "xml/node-event-vector.h"
36 #include "sp-cursor.h"
37 #include "shortcuts.h"
38 #include "desktop.h"
39 #include "desktop-handles.h"
40 #include "selection.h"
41 #include "file.h"
42 #include "interface.h"
43 #include "macros.h"
44 #include "tools-switch.h"
45 #include "prefs-utils.h"
46 #include "message-context.h"
47 #include "gradient-drag.h"
48 #include "object-edit.h"
49 #include "attributes.h"
50 #include "rubberband.h"
51 #include "selcue.h"
53 #include "event-context.h"
55 static void sp_event_context_class_init(SPEventContextClass *klass);
56 static void sp_event_context_init(SPEventContext *event_context);
57 static void sp_event_context_dispose(GObject *object);
59 static void sp_event_context_private_setup(SPEventContext *ec);
60 static gint sp_event_context_private_root_handler(SPEventContext *event_context, GdkEvent *event);
61 static gint sp_event_context_private_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
63 static void set_event_location(SPDesktop * desktop, GdkEvent * event);
65 static GObjectClass *parent_class;
67 // globals for temporary switching to selector by space
68 static bool selector_toggled = FALSE;
69 static int switch_selector_to = 0;
71 static gint xp = 0, yp = 0; // where drag started
72 static gint tolerance = 0;
73 static bool within_tolerance = false;
75 // globals for keeping track of keyboard scroll events in order to accelerate
76 static guint32 scroll_event_time = 0;
77 static gdouble scroll_multiply = 1;
78 static guint scroll_keyval = 0;
80 /**
81 * Registers the SPEventContext class with Glib and returns its type number.
82 */
83 GType
84 sp_event_context_get_type(void)
85 {
86 static GType type = 0;
87 if (!type) {
88 GTypeInfo info = {
89 sizeof(SPEventContextClass),
90 NULL, NULL,
91 (GClassInitFunc) sp_event_context_class_init,
92 NULL, NULL,
93 sizeof(SPEventContext),
94 4,
95 (GInstanceInitFunc) sp_event_context_init,
96 NULL, /* value_table */
97 };
98 type = g_type_register_static(G_TYPE_OBJECT, "SPEventContext", &info, (GTypeFlags)0);
99 }
100 return type;
101 }
103 /**
104 * Callback to set up the SPEventContext vtable.
105 */
106 static void
107 sp_event_context_class_init(SPEventContextClass *klass)
108 {
109 GObjectClass *object_class;
111 object_class = (GObjectClass *) klass;
113 parent_class = (GObjectClass*)g_type_class_peek_parent(klass);
115 object_class->dispose = sp_event_context_dispose;
117 klass->setup = sp_event_context_private_setup;
118 klass->root_handler = sp_event_context_private_root_handler;
119 klass->item_handler = sp_event_context_private_item_handler;
120 }
122 /**
123 * Clears all SPEventContext object members.
124 */
125 static void
126 sp_event_context_init(SPEventContext *event_context)
127 {
128 event_context->desktop = NULL;
129 event_context->cursor = NULL;
130 event_context->_message_context = NULL;
131 event_context->_selcue = NULL;
132 event_context->_grdrag = NULL;
133 }
135 /**
136 * Callback to free and null member variables of SPEventContext object.
137 */
138 static void
139 sp_event_context_dispose(GObject *object)
140 {
141 SPEventContext *ec;
143 ec = SP_EVENT_CONTEXT(object);
145 if (ec->_message_context) {
146 delete ec->_message_context;
147 }
149 if (ec->cursor != NULL) {
150 gdk_cursor_unref(ec->cursor);
151 ec->cursor = NULL;
152 }
154 if (ec->desktop) {
155 ec->desktop = NULL;
156 }
158 if (ec->prefs_repr) {
159 sp_repr_remove_listener_by_data(ec->prefs_repr, ec);
160 Inkscape::GC::release(ec->prefs_repr);
161 ec->prefs_repr = NULL;
162 }
164 G_OBJECT_CLASS(parent_class)->dispose(object);
165 }
167 /**
168 * Recreates and draws cursor on desktop related to SPEventContext.
169 */
170 void
171 sp_event_context_update_cursor(SPEventContext *ec)
172 {
173 GtkWidget *w = GTK_WIDGET(sp_desktop_canvas(ec->desktop));
174 if (w->window) {
175 /* fixme: */
176 if (ec->cursor_shape) {
177 GdkBitmap *bitmap = NULL;
178 GdkBitmap *mask = NULL;
179 sp_cursor_bitmap_and_mask_from_xpm(&bitmap, &mask, ec->cursor_shape);
180 if ((bitmap != NULL) && (mask != NULL)) {
181 if (ec->cursor)
182 gdk_cursor_unref (ec->cursor);
183 ec->cursor = gdk_cursor_new_from_pixmap(bitmap, mask,
184 &w->style->black,
185 &w->style->white,
186 ec->hot_x, ec->hot_y);
187 g_object_unref (bitmap);
188 g_object_unref (mask);
189 }
190 }
191 gdk_window_set_cursor(w->window, ec->cursor);
192 }
193 }
195 /**
196 * Callback that gets called on initialization of SPEventContext object.
197 * Redraws mouse cursor, at the moment.
198 */
199 static void
200 sp_event_context_private_setup(SPEventContext *ec)
201 {
202 sp_event_context_update_cursor(ec);
203 }
205 /**
206 * \brief Gobbles next key events on the queue with the same keyval and mask. Returns the number of events consumed.
207 */
208 gint gobble_key_events(guint keyval, gint mask)
209 {
210 GdkEvent *event_next;
211 gint i = 0;
213 event_next = gdk_event_get();
214 // while the next event is also a key notify with the same keyval and mask,
215 while (event_next && event_next->type == GDK_KEY_PRESS
216 && event_next->key.keyval == keyval
217 && (event_next->key.state & mask)) {
218 // kill it
219 gdk_event_free(event_next);
220 // get next
221 event_next = gdk_event_get();
222 i ++;
223 }
224 // otherwise, put it back onto the queue
225 if (event_next) gdk_event_put(event_next);
227 return i;
228 }
230 /**
231 * \brief Gobbles next motion notify events on the queue with the same mask. Returns the number of events consumed.
232 */
233 gint gobble_motion_events(gint mask)
234 {
235 GdkEvent *event_next;
236 gint i = 0;
238 event_next = gdk_event_get();
239 // while the next event is also a key notify with the same keyval and mask,
240 while (event_next && event_next->type == GDK_MOTION_NOTIFY
241 && (event_next->motion.state & mask)) {
242 // kill it
243 gdk_event_free(event_next);
244 // get next
245 event_next = gdk_event_get();
246 i ++;
247 }
248 // otherwise, put it back onto the queue
249 if (event_next) gdk_event_put(event_next);
251 return i;
252 }
254 /**
255 * Toggles current tool between active tool and selector tool.
256 * Subroutine of sp_event_context_private_root_handler().
257 */
258 static void
259 sp_toggle_selector(SPDesktop *dt)
260 {
261 if (!dt->event_context) return;
263 if (tools_isactive(dt, TOOLS_SELECT)) {
264 if (selector_toggled) {
265 if (switch_selector_to) tools_switch (dt, switch_selector_to);
266 selector_toggled = FALSE;
267 } else return;
268 } else {
269 selector_toggled = TRUE;
270 switch_selector_to = tools_active(dt);
271 tools_switch (dt, TOOLS_SELECT);
272 }
273 }
275 /**
276 * Calculates and keeps track of scroll acceleration.
277 * Subroutine of sp_event_context_private_root_handler().
278 */
279 static gdouble accelerate_scroll(GdkEvent *event, gdouble acceleration)
280 {
281 guint32 time_diff = ((GdkEventKey *) event)->time - scroll_event_time;
283 /* key pressed within 500ms ? (1/2 second) */
284 if (time_diff > 500 || event->key.keyval != scroll_keyval) {
285 scroll_multiply = 1;
286 } else {
287 scroll_multiply += acceleration;
288 }
290 scroll_event_time = ((GdkEventKey *) event)->time;
291 scroll_keyval = event->key.keyval;
293 return scroll_multiply;
294 }
296 /**
297 * Main event dispatch, gets called from Gdk.
298 */
299 static gint sp_event_context_private_root_handler(SPEventContext *event_context, GdkEvent *event)
300 {
301 static NR::Point button_w;
302 static unsigned int panning = 0;
303 static unsigned int zoom_rb = 0;
305 SPDesktop *desktop = event_context->desktop;
307 tolerance = prefs_get_int_attribute_limited(
308 "options.dragtolerance","value", 0, 0, 100);
309 double const zoom_inc = prefs_get_double_attribute_limited(
310 "options.zoomincrement", "value", M_SQRT2, 1.01, 10);
311 double const acceleration = prefs_get_double_attribute_limited(
312 "options.scrollingacceleration", "value", 0, 0, 6);
313 int const key_scroll = prefs_get_int_attribute_limited(
314 "options.keyscroll", "value", 10, 0, 1000);
315 int const wheel_scroll = prefs_get_int_attribute_limited(
316 "options.wheelscroll", "value", 40, 0, 1000);
318 gint ret = FALSE;
320 switch (event->type) {
321 case GDK_2BUTTON_PRESS:
322 if (panning) {
323 panning = 0;
324 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
325 event->button.time);
326 ret = TRUE;
327 } else {
328 /* sp_desktop_dialog(); */
329 }
330 break;
331 case GDK_BUTTON_PRESS:
333 // save drag origin
334 xp = (gint) event->button.x;
335 yp = (gint) event->button.y;
336 within_tolerance = true;
338 switch (event->button.button) {
339 case 2:
340 button_w = NR::Point(event->button.x,
341 event->button.y);
342 if (event->button.state == GDK_SHIFT_MASK) {
343 zoom_rb = 2;
344 } else {
345 panning = 2;
346 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
347 GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK,
348 NULL, event->button.time-1);
349 }
350 ret = TRUE;
351 break;
352 case 3:
353 if (event->button.state & GDK_SHIFT_MASK
354 || event->button.state & GDK_CONTROL_MASK) {
355 button_w = NR::Point(event->button.x,
356 event->button.y);
357 panning = 3;
358 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
359 GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK,
360 NULL, event->button.time);
361 ret = TRUE;
362 } else {
363 sp_event_root_menu_popup(desktop, NULL, event);
364 }
365 break;
366 default:
367 break;
368 }
369 break;
370 case GDK_MOTION_NOTIFY:
371 if (panning) {
372 if ((panning == 2 && !(event->motion.state & GDK_BUTTON2_MASK))
373 || (panning == 3 && !(event->motion.state & GDK_BUTTON3_MASK))) {
374 /* Gdk seems to lose button release for us sometimes :-( */
375 panning = 0;
376 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
377 event->button.time);
378 ret = TRUE;
379 } else {
380 if ( within_tolerance
381 && ( abs( (gint) event->motion.x - xp ) < tolerance )
382 && ( abs( (gint) event->motion.y - yp ) < tolerance ))
383 {
384 // do not drag if we're within tolerance from origin
385 break;
386 }
387 // Once the user has moved farther than tolerance from
388 // the original location (indicating they intend to move
389 // the object, not click), then always process the motion
390 // notify coordinates as given (no snapping back to origin)
391 within_tolerance = false;
393 // gobble subsequent motion events to prevent "sticking"
394 // when scrolling is slow
395 gobble_motion_events(panning == 2 ?
396 GDK_BUTTON2_MASK : GDK_BUTTON3_MASK);
398 NR::Point const motion_w(event->motion.x,
399 event->motion.y);
400 NR::Point const moved_w( motion_w - button_w );
401 event_context->desktop->scroll_world(moved_w);
402 ret = TRUE;
403 }
404 } else if (zoom_rb) {
405 NR::Point const motion_w(event->motion.x, event->motion.y);
406 NR::Point const motion_dt(desktop->w2d(motion_w));
408 if ( within_tolerance
409 && ( abs( (gint) event->motion.x - xp ) < tolerance )
410 && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
411 break; // do not drag if we're within tolerance from origin
412 }
414 if (within_tolerance) {
415 Inkscape::Rubberband::get()->start(desktop, motion_dt);
416 } else {
417 Inkscape::Rubberband::get()->move(motion_dt);
418 }
420 // Once the user has moved farther than tolerance from the original location
421 // (indicating they intend to move the object, not click), then always process the
422 // motion notify coordinates as given (no snapping back to origin)
423 within_tolerance = false;
424 }
425 break;
426 case GDK_BUTTON_RELEASE:
427 xp = yp = 0;
428 if (within_tolerance && (panning || zoom_rb)) {
429 zoom_rb = 0;
430 NR::Point const event_w(event->button.x, event->button.y);
431 NR::Point const event_dt(desktop->w2d(event_w));
432 desktop->zoom_relative_keep_point(event_dt,
433 (event->button.state & GDK_SHIFT_MASK) ? 1/zoom_inc : zoom_inc);
434 desktop->updateNow();
435 }
436 if (panning == event->button.button) {
437 panning = 0;
438 ret = TRUE;
439 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
440 event->button.time);
441 desktop->updateNow();
442 } else if (zoom_rb == event->button.button) {
443 zoom_rb = 0;
444 NR::Maybe<NR::Rect> const b = Inkscape::Rubberband::get()->getRectangle();
445 Inkscape::Rubberband::get()->stop();
446 if (b != NR::Nothing() && !within_tolerance) {
447 desktop->set_display_area(b.assume(), 10);
448 }
449 }
450 break;
451 case GDK_KEY_PRESS:
452 switch (get_group0_keyval(&event->key)) {
453 // GDK insists on stealing these keys (F1 for no idea what, tab for cycling widgets
454 // in the editing window). So we resteal them back and run our regular shortcut
455 // invoker on them.
456 unsigned int shortcut;
457 case GDK_Tab:
458 case GDK_ISO_Left_Tab:
459 case GDK_F1:
460 shortcut = get_group0_keyval(&event->key);
461 if (event->key.state & GDK_SHIFT_MASK)
462 shortcut |= SP_SHORTCUT_SHIFT_MASK;
463 if (event->key.state & GDK_CONTROL_MASK)
464 shortcut |= SP_SHORTCUT_CONTROL_MASK;
465 if (event->key.state & GDK_MOD1_MASK)
466 shortcut |= SP_SHORTCUT_ALT_MASK;
467 ret = sp_shortcut_invoke(shortcut, desktop);
468 break;
470 case GDK_W:
471 case GDK_w:
472 case GDK_F4:
473 /* Close view */
474 if (MOD__CTRL_ONLY) {
475 sp_ui_close_view(NULL);
476 ret = TRUE;
477 }
478 break;
479 case GDK_Left: // Ctrl Left
480 case GDK_KP_Left:
481 case GDK_KP_4:
482 if (MOD__CTRL_ONLY) {
483 int i = (int) floor(key_scroll * accelerate_scroll(event, acceleration));
484 gobble_key_events(get_group0_keyval(&event->key),
485 GDK_CONTROL_MASK);
486 event_context->desktop->scroll_world(i, 0);
487 ret = TRUE;
488 }
489 break;
490 case GDK_Up: // Ctrl Up
491 case GDK_KP_Up:
492 case GDK_KP_8:
493 if (MOD__CTRL_ONLY) {
494 int i = (int) floor(key_scroll * accelerate_scroll(event, acceleration));
495 gobble_key_events(get_group0_keyval(&event->key),
496 GDK_CONTROL_MASK);
497 event_context->desktop->scroll_world(0, i);
498 ret = TRUE;
499 }
500 break;
501 case GDK_Right: // Ctrl Right
502 case GDK_KP_Right:
503 case GDK_KP_6:
504 if (MOD__CTRL_ONLY) {
505 int i = (int) floor(key_scroll * accelerate_scroll(event, acceleration));
506 gobble_key_events(get_group0_keyval(&event->key),
507 GDK_CONTROL_MASK);
508 event_context->desktop->scroll_world(-i, 0);
509 ret = TRUE;
510 }
511 break;
512 case GDK_Down: // Ctrl Down
513 case GDK_KP_Down:
514 case GDK_KP_2:
515 if (MOD__CTRL_ONLY) {
516 int i = (int) floor(key_scroll * accelerate_scroll(event, acceleration));
517 gobble_key_events(get_group0_keyval(&event->key),
518 GDK_CONTROL_MASK);
519 event_context->desktop->scroll_world(0, -i);
520 ret = TRUE;
521 }
522 break;
523 case GDK_F10:
524 if (MOD__SHIFT_ONLY) {
525 sp_event_root_menu_popup(desktop, NULL, event);
526 ret= TRUE;
527 }
528 break;
529 case GDK_space:
530 sp_toggle_selector(desktop);
531 ret= TRUE;
532 break;
533 case GDK_z:
534 case GDK_Z:
535 if (MOD__ALT_ONLY) {
536 desktop->zoom_grab_focus();
537 ret = TRUE;
538 }
539 break;
540 default:
541 break;
542 }
543 break;
544 case GDK_SCROLL:
545 /* shift + wheel, pan left--right */
546 if (event->scroll.state & GDK_SHIFT_MASK) {
547 switch (event->scroll.direction) {
548 case GDK_SCROLL_UP:
549 desktop->scroll_world(wheel_scroll, 0);
550 break;
551 case GDK_SCROLL_DOWN:
552 desktop->scroll_world(-wheel_scroll, 0);
553 break;
554 default:
555 break;
556 }
558 /* ctrl + wheel, zoom in--out */
559 } else if (event->scroll.state & GDK_CONTROL_MASK) {
560 double rel_zoom;
561 switch (event->scroll.direction) {
562 case GDK_SCROLL_UP:
563 rel_zoom = zoom_inc;
564 break;
565 case GDK_SCROLL_DOWN:
566 rel_zoom = 1 / zoom_inc;
567 break;
568 default:
569 rel_zoom = 0.0;
570 break;
571 }
572 if (rel_zoom != 0.0) {
573 NR::Point const scroll_dt = desktop->point();
574 desktop->zoom_relative_keep_point(scroll_dt, rel_zoom);
575 }
577 /* no modifier, pan up--down (left--right on multiwheel mice?) */
578 } else {
579 switch (event->scroll.direction) {
580 case GDK_SCROLL_UP:
581 desktop->scroll_world(0, wheel_scroll);
582 break;
583 case GDK_SCROLL_DOWN:
584 desktop->scroll_world(0, -wheel_scroll);
585 break;
586 case GDK_SCROLL_LEFT:
587 desktop->scroll_world(wheel_scroll, 0);
588 break;
589 case GDK_SCROLL_RIGHT:
590 desktop->scroll_world(-wheel_scroll, 0);
591 break;
592 }
593 }
594 break;
595 default:
596 break;
597 }
599 return ret;
600 }
602 /**
603 * Handles item specific events. Gets called from Gdk.
604 *
605 * Only reacts to right mouse button at the moment.
606 * \todo Fixme: do context sensitive popup menu on items.
607 */
608 gint
609 sp_event_context_private_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
610 {
611 int ret = FALSE;
613 switch (event->type) {
614 case GDK_BUTTON_PRESS:
615 if ((event->button.button == 3)
616 && !(event->button.state & GDK_SHIFT_MASK || event->button.state & GDK_CONTROL_MASK)) {
617 sp_event_root_menu_popup(ec->desktop, item, event);
618 ret = TRUE;
619 }
620 break;
621 default:
622 break;
623 }
625 return ret;
626 }
628 /**
629 * Gets called when attribute changes value.
630 */
631 static void
632 sp_ec_repr_attr_changed(Inkscape::XML::Node *prefs_repr, gchar const *key, gchar const *oldval, gchar const *newval,
633 bool is_interactive, gpointer data)
634 {
635 SPEventContext *ec;
637 ec = SP_EVENT_CONTEXT(data);
639 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->set) {
640 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->set(ec, key, newval);
641 }
642 }
644 Inkscape::XML::NodeEventVector sp_ec_event_vector = {
645 NULL, /* Child added */
646 NULL, /* Child removed */
647 sp_ec_repr_attr_changed,
648 NULL, /* Content changed */
649 NULL /* Order changed */
650 };
652 /**
653 * Creates new SPEventContext object and calls its virtual setup() function.
654 */
655 SPEventContext *
656 sp_event_context_new(GType type, SPDesktop *desktop, Inkscape::XML::Node *prefs_repr, unsigned int key)
657 {
658 g_return_val_if_fail(g_type_is_a(type, SP_TYPE_EVENT_CONTEXT), NULL);
659 g_return_val_if_fail(desktop != NULL, NULL);
661 SPEventContext *const ec = (SPEventContext*)g_object_new(type, NULL);
663 ec->desktop = desktop;
664 ec->_message_context = new Inkscape::MessageContext(desktop->messageStack());
665 ec->key = key;
666 ec->prefs_repr = prefs_repr;
667 if (ec->prefs_repr) {
668 Inkscape::GC::anchor(ec->prefs_repr);
669 sp_repr_add_listener(ec->prefs_repr, &sp_ec_event_vector, ec);
670 }
672 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->setup)
673 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->setup(ec);
675 return ec;
676 }
678 /**
679 * Finishes SPEventContext.
680 */
681 void
682 sp_event_context_finish(SPEventContext *ec)
683 {
684 g_return_if_fail(ec != NULL);
685 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
687 ec->enableSelectionCue(false);
689 if (ec->next) {
690 g_warning("Finishing event context with active link\n");
691 }
693 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->finish)
694 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->finish(ec);
695 }
697 //-------------------------------member functions
699 /**
700 * Enables/disables the SPEventContext's SelCue.
701 */
702 void SPEventContext::enableSelectionCue(bool enable) {
703 if (enable) {
704 if (!_selcue) {
705 _selcue = new Inkscape::SelCue(desktop);
706 }
707 } else {
708 delete _selcue;
709 _selcue = NULL;
710 }
711 }
713 /**
714 * Enables/disables the SPEventContext's GrDrag.
715 */
716 void SPEventContext::enableGrDrag(bool enable) {
717 if (enable) {
718 if (!_grdrag) {
719 _grdrag = new GrDrag(desktop);
720 }
721 } else {
722 if (_grdrag) {
723 delete _grdrag;
724 _grdrag = NULL;
725 }
726 }
727 }
729 /**
730 * Calls virtual set() function of SPEventContext.
731 */
732 void
733 sp_event_context_read(SPEventContext *ec, gchar const *key)
734 {
735 g_return_if_fail(ec != NULL);
736 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
737 g_return_if_fail(key != NULL);
739 if (ec->prefs_repr) {
740 gchar const *val = ec->prefs_repr->attribute(key);
741 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->set)
742 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->set(ec, key, val);
743 }
744 }
746 /**
747 * Calls virtual activate() function of SPEventContext.
748 */
749 void
750 sp_event_context_activate(SPEventContext *ec)
751 {
752 g_return_if_fail(ec != NULL);
753 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
755 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->activate)
756 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->activate(ec);
757 }
759 /**
760 * Calls virtual deactivate() function of SPEventContext.
761 */
762 void
763 sp_event_context_deactivate(SPEventContext *ec)
764 {
765 g_return_if_fail(ec != NULL);
766 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
768 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->deactivate)
769 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->deactivate(ec);
770 }
772 /**
773 * Calls virtual root_handler(), the main event handling function.
774 */
775 gint
776 sp_event_context_root_handler(SPEventContext * event_context, GdkEvent * event)
777 {
778 gint ret;
780 ret = ((SPEventContextClass *) G_OBJECT_GET_CLASS(event_context))->root_handler(event_context, event);
782 set_event_location(event_context->desktop, event);
784 return ret;
785 }
787 /**
788 * Calls virtual item_handler(), the item event handling function.
789 */
790 gint
791 sp_event_context_item_handler(SPEventContext * event_context, SPItem * item, GdkEvent * event)
792 {
793 gint ret;
795 ret = ((SPEventContextClass *) G_OBJECT_GET_CLASS(event_context))->item_handler(event_context, item, event);
797 if (! ret) {
798 ret = sp_event_context_root_handler(event_context, event);
799 } else {
800 set_event_location(event_context->desktop, event);
801 }
803 return ret;
804 }
806 /**
807 * Emits 'position_set' signal on desktop and shows coordinates on status bar.
808 */
809 static void set_event_location(SPDesktop *desktop, GdkEvent *event)
810 {
811 if (event->type != GDK_MOTION_NOTIFY) {
812 return;
813 }
815 NR::Point const button_w(event->button.x, event->button.y);
816 NR::Point const button_dt(desktop->w2d(button_w));
817 desktop-> setPosition (button_dt);
818 desktop->set_coordinate_status(button_dt);
819 }
821 //-------------------------------------------------------------------
822 /**
823 * Create popup menu and tell Gtk to show it.
824 */
825 void
826 sp_event_root_menu_popup(SPDesktop *desktop, SPItem *item, GdkEvent *event)
827 {
828 GtkWidget *menu;
830 /* fixme: This is not what I want but works for now (Lauris) */
831 if (event->type == GDK_KEY_PRESS) {
832 item = sp_desktop_selection(desktop)->singleItem();
833 }
834 menu = sp_ui_context_menu(desktop, item);
835 gtk_widget_show(menu);
837 switch (event->type) {
838 case GDK_BUTTON_PRESS:
839 gtk_menu_popup(GTK_MENU(menu), NULL, NULL, 0, NULL, event->button.button, event->button.time);
840 break;
841 case GDK_KEY_PRESS:
842 gtk_menu_popup(GTK_MENU(menu), NULL, NULL, 0, NULL, 0, event->key.time);
843 break;
844 default:
845 break;
846 }
847 }
849 /**
850 * Show tool context specific modifier tip.
851 */
852 void
853 sp_event_show_modifier_tip(Inkscape::MessageContext *message_context,
854 GdkEvent *event, gchar const *ctrl_tip, gchar const *shift_tip,
855 gchar const *alt_tip)
856 {
857 guint keyval = get_group0_keyval(&event->key);
859 bool ctrl = ctrl_tip && (MOD__CTRL
860 || (keyval == GDK_Control_L)
861 || (keyval == GDK_Control_R));
862 bool shift = shift_tip
863 && (MOD__SHIFT || (keyval == GDK_Shift_L) || (keyval == GDK_Shift_R));
864 bool alt = alt_tip
865 && (MOD__ALT
866 || (keyval == GDK_Alt_L)
867 || (keyval == GDK_Alt_R)
868 || (keyval == GDK_Meta_L)
869 || (keyval == GDK_Meta_R));
871 gchar *tip = g_strdup_printf("%s%s%s%s%s",
872 ( ctrl ? ctrl_tip : "" ),
873 ( ctrl && (shift || alt) ? "; " : "" ),
874 ( shift ? shift_tip : "" ),
875 ( (ctrl || shift) && alt ? "; " : "" ),
876 ( alt ? alt_tip : "" ));
878 if (strlen(tip) > 0) {
879 message_context->flash(Inkscape::INFORMATION_MESSAGE, tip);
880 }
882 g_free(tip);
883 }
885 /**
886 * Return the keyval corresponding to the key event in group 0, i.e.,
887 * in the main (English) layout.
888 *
889 * Use this instead of simply event->keyval, so that your keyboard shortcuts
890 * work regardless of layouts (e.g., in Cyrillic).
891 */
892 guint
893 get_group0_keyval(GdkEventKey *event)
894 {
895 guint keyval = 0;
896 gdk_keymap_translate_keyboard_state(
897 gdk_keymap_get_for_display(gdk_display_get_default()),
898 event->hardware_keycode,
899 (GdkModifierType) event->state,
900 0 /*event->key.group*/,
901 &keyval, NULL, NULL, NULL);
902 return keyval;
903 }
905 /**
906 * Returns item at point p in desktop.
907 *
908 * If state includes alt key mask, cyclically selects under; honors
909 * into_groups.
910 */
911 SPItem *
912 sp_event_context_find_item (SPDesktop *desktop, NR::Point const p,
913 bool select_under, bool into_groups)
914 {
915 SPItem *item;
917 if (select_under) {
918 SPItem *selected_at_point =
919 desktop->item_from_list_at_point_bottom (desktop->selection->itemList(), p);
920 item = desktop->item_at_point(p, into_groups, selected_at_point);
921 if (item == NULL) { // we may have reached bottom, flip over to the top
922 item = desktop->item_at_point(p, into_groups, NULL);
923 }
924 } else
925 item = desktop->item_at_point(p, into_groups, NULL);
927 return item;
928 }
930 /**
931 * Returns item if it is under point p in desktop, at any depth; otherwise returns NULL.
932 *
933 * Honors into_groups.
934 */
935 SPItem *
936 sp_event_context_over_item (SPDesktop *desktop, SPItem *item, NR::Point const p)
937 {
938 GSList *temp = NULL;
939 temp = g_slist_prepend (temp, item);
940 SPItem *item_at_point = desktop->item_from_list_at_point_bottom (temp, p);
941 g_slist_free (temp);
943 return item_at_point;
944 }
946 /**
947 * Called when SPEventContext subclass node attribute changed.
948 */
949 void
950 ec_shape_event_attr_changed(Inkscape::XML::Node *shape_repr, gchar const *name,
951 gchar const *old_value, gchar const *new_value,
952 bool const is_interactive, gpointer const data)
953 {
954 if (!name
955 || !strcmp(name, "style")
956 || SP_ATTRIBUTE_IS_CSS(sp_attribute_lookup(name))) {
957 // no need to regenrate knotholder if only style changed
958 return;
959 }
961 SPEventContext *ec = SP_EVENT_CONTEXT(data);
963 if (ec->shape_knot_holder) {
964 sp_knot_holder_destroy(ec->shape_knot_holder);
965 }
966 ec->shape_knot_holder = NULL;
968 SPDesktop *desktop = ec->desktop;
970 SPItem *item = sp_desktop_selection(desktop)->singleItem();
972 if (item) {
973 ec->shape_knot_holder = sp_item_knot_holder(item, desktop);
974 }
975 }
978 /*
979 Local Variables:
980 mode:c++
981 c-file-style:"stroustrup"
982 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
983 indent-tabs-mode:nil
984 fill-column:99
985 End:
986 */
987 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :