47447e6a0fa4263a6c10e3b09158156529a4f20d
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 // This is a hack that is necessary because when middle-clicking too fast,
297 // button_press events come for all clicks but there's button_release only
298 // for the first one. So after a release, we must prohibit the next grab for
299 // some time, or the grab will be stuck. Perhaps this is caused by some
300 // wrong handling of events among contexts and not by a GDK bug;
301 // if someone can fix this properly this would be great.
302 static gint dontgrab = 0;
303 static bool
304 grab_allow_again()
305 {
306 dontgrab--;
307 if (dontgrab < 0) dontgrab = 0;
308 return FALSE; // so that it is only called once
309 }
311 /**
312 * Main event dispatch, gets called from Gdk.
313 */
314 static gint sp_event_context_private_root_handler(SPEventContext *event_context, GdkEvent *event)
315 {
316 static NR::Point button_w;
317 static unsigned int panning = 0;
318 static unsigned int zoom_rb = 0;
320 SPDesktop *desktop = event_context->desktop;
322 tolerance = prefs_get_int_attribute_limited(
323 "options.dragtolerance","value", 0, 0, 100);
324 double const zoom_inc = prefs_get_double_attribute_limited(
325 "options.zoomincrement", "value", M_SQRT2, 1.01, 10);
326 double const acceleration = prefs_get_double_attribute_limited(
327 "options.scrollingacceleration", "value", 0, 0, 6);
328 int const key_scroll = prefs_get_int_attribute_limited(
329 "options.keyscroll", "value", 10, 0, 1000);
330 int const wheel_scroll = prefs_get_int_attribute_limited(
331 "options.wheelscroll", "value", 40, 0, 1000);
333 gint ret = FALSE;
335 switch (event->type) {
336 case GDK_2BUTTON_PRESS:
337 if (panning) {
338 panning = 0;
339 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
340 event->button.time);
341 ret = TRUE;
342 } else {
343 /* sp_desktop_dialog(); */
344 }
345 break;
346 case GDK_BUTTON_PRESS:
348 // save drag origin
349 xp = (gint) event->button.x;
350 yp = (gint) event->button.y;
351 within_tolerance = true;
353 switch (event->button.button) {
354 case 2:
356 if (dontgrab)
357 // double-click, still not permitted to grab;
358 // increase the counter to guard against triple click
359 {
360 dontgrab ++;
361 gtk_timeout_add(250, (GtkFunction) grab_allow_again, NULL);
362 break;
363 }
365 button_w = NR::Point(event->button.x,
366 event->button.y);
367 if (event->button.state == GDK_SHIFT_MASK) {
368 zoom_rb = 2;
369 } else {
370 panning = 2;
371 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
372 GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK,
373 NULL, event->button.time-1);
374 }
375 ret = TRUE;
376 break;
377 case 3:
378 if (event->button.state & GDK_SHIFT_MASK
379 || event->button.state & GDK_CONTROL_MASK) {
380 button_w = NR::Point(event->button.x,
381 event->button.y);
382 panning = 3;
383 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
384 GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK,
385 NULL, event->button.time);
386 ret = TRUE;
387 } else {
388 sp_event_root_menu_popup(desktop, NULL, event);
389 }
390 break;
391 default:
392 break;
393 }
394 break;
395 case GDK_MOTION_NOTIFY:
396 if (panning) {
397 if ((panning == 2 && !(event->motion.state & GDK_BUTTON2_MASK))
398 || (panning == 3 && !(event->motion.state & GDK_BUTTON3_MASK))) {
399 /* Gdk seems to lose button release for us sometimes :-( */
400 panning = 0;
401 dontgrab = 0;
402 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
403 event->button.time);
404 ret = TRUE;
405 } else {
406 if ( within_tolerance
407 && ( abs( (gint) event->motion.x - xp ) < tolerance )
408 && ( abs( (gint) event->motion.y - yp ) < tolerance ))
409 {
410 // do not drag if we're within tolerance from origin
411 break;
412 }
413 // Once the user has moved farther than tolerance from
414 // the original location (indicating they intend to move
415 // the object, not click), then always process the motion
416 // notify coordinates as given (no snapping back to origin)
417 within_tolerance = false;
419 // gobble subsequent motion events to prevent "sticking"
420 // when scrolling is slow
421 gobble_motion_events(panning == 2 ?
422 GDK_BUTTON2_MASK : GDK_BUTTON3_MASK);
424 NR::Point const motion_w(event->motion.x,
425 event->motion.y);
426 NR::Point const moved_w( motion_w - button_w );
427 event_context->desktop->scroll_world(moved_w);
428 ret = TRUE;
429 }
430 } else if (zoom_rb) {
431 NR::Point const motion_w(event->motion.x, event->motion.y);
432 NR::Point const motion_dt(desktop->w2d(motion_w));
434 if ( within_tolerance
435 && ( abs( (gint) event->motion.x - xp ) < tolerance )
436 && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
437 break; // do not drag if we're within tolerance from origin
438 }
440 if (within_tolerance) {
441 Inkscape::Rubberband::get()->start(desktop, motion_dt);
442 } else {
443 Inkscape::Rubberband::get()->move(motion_dt);
444 }
446 // Once the user has moved farther than tolerance from the original location
447 // (indicating they intend to move the object, not click), then always process the
448 // motion notify coordinates as given (no snapping back to origin)
449 within_tolerance = false;
450 }
451 break;
452 case GDK_BUTTON_RELEASE:
453 if (within_tolerance && (panning || zoom_rb)) {
454 dontgrab ++;
455 NR::Point const event_w(event->button.x, event->button.y);
456 NR::Point const event_dt(desktop->w2d(event_w));
457 double const zoom_power = ( (event->button.state & GDK_SHIFT_MASK)
458 ? -dontgrab : dontgrab );
459 desktop->zoom_relative_keep_point(event_dt,
460 pow(zoom_inc, zoom_power));
461 gtk_timeout_add(250, (GtkFunction) grab_allow_again, NULL);
462 desktop->updateNow();
463 }
464 if (panning == event->button.button) {
465 panning = 0;
466 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
467 event->button.time);
468 desktop->updateNow();
469 ret = TRUE;
470 } else if (zoom_rb == event->button.button) {
471 zoom_rb = 0;
472 NR::Maybe<NR::Rect> const b = Inkscape::Rubberband::get()->getRectangle();
473 if (b != NR::Nothing() && !within_tolerance) {
474 desktop->set_display_area(b.assume(), 10);
475 }
476 Inkscape::Rubberband::get()->stop();
477 }
478 xp = yp = 0;
479 break;
480 case GDK_KEY_PRESS:
481 switch (get_group0_keyval(&event->key)) {
482 // GDK insists on stealing these keys (F1 for no idea what, tab for cycling widgets
483 // in the editing window). So we resteal them back and run our regular shortcut
484 // invoker on them.
485 unsigned int shortcut;
486 case GDK_Tab:
487 case GDK_ISO_Left_Tab:
488 case GDK_F1:
489 shortcut = get_group0_keyval(&event->key);
490 if (event->key.state & GDK_SHIFT_MASK)
491 shortcut |= SP_SHORTCUT_SHIFT_MASK;
492 if (event->key.state & GDK_CONTROL_MASK)
493 shortcut |= SP_SHORTCUT_CONTROL_MASK;
494 if (event->key.state & GDK_MOD1_MASK)
495 shortcut |= SP_SHORTCUT_ALT_MASK;
496 ret = sp_shortcut_invoke(shortcut, desktop);
497 break;
499 case GDK_W:
500 case GDK_w:
501 case GDK_F4:
502 /* Close view */
503 if (MOD__CTRL_ONLY) {
504 sp_ui_close_view(NULL);
505 ret = TRUE;
506 }
507 break;
508 case GDK_Left: // Ctrl Left
509 case GDK_KP_Left:
510 case GDK_KP_4:
511 if (MOD__CTRL_ONLY) {
512 int i = (int) floor(key_scroll * accelerate_scroll(event, acceleration));
513 gobble_key_events(get_group0_keyval(&event->key),
514 GDK_CONTROL_MASK);
515 event_context->desktop->scroll_world(i, 0);
516 ret = TRUE;
517 }
518 break;
519 case GDK_Up: // Ctrl Up
520 case GDK_KP_Up:
521 case GDK_KP_8:
522 if (MOD__CTRL_ONLY) {
523 int i = (int) floor(key_scroll * accelerate_scroll(event, acceleration));
524 gobble_key_events(get_group0_keyval(&event->key),
525 GDK_CONTROL_MASK);
526 event_context->desktop->scroll_world(0, i);
527 ret = TRUE;
528 }
529 break;
530 case GDK_Right: // Ctrl Right
531 case GDK_KP_Right:
532 case GDK_KP_6:
533 if (MOD__CTRL_ONLY) {
534 int i = (int) floor(key_scroll * accelerate_scroll(event, acceleration));
535 gobble_key_events(get_group0_keyval(&event->key),
536 GDK_CONTROL_MASK);
537 event_context->desktop->scroll_world(-i, 0);
538 ret = TRUE;
539 }
540 break;
541 case GDK_Down: // Ctrl Down
542 case GDK_KP_Down:
543 case GDK_KP_2:
544 if (MOD__CTRL_ONLY) {
545 int i = (int) floor(key_scroll * accelerate_scroll(event, acceleration));
546 gobble_key_events(get_group0_keyval(&event->key),
547 GDK_CONTROL_MASK);
548 event_context->desktop->scroll_world(0, -i);
549 ret = TRUE;
550 }
551 break;
552 case GDK_F10:
553 if (MOD__SHIFT_ONLY) {
554 sp_event_root_menu_popup(desktop, NULL, event);
555 ret= TRUE;
556 }
557 break;
558 case GDK_space:
559 sp_toggle_selector(desktop);
560 ret= TRUE;
561 break;
562 case GDK_z:
563 case GDK_Z:
564 if (MOD__ALT_ONLY) {
565 desktop->zoom_grab_focus();
566 ret = TRUE;
567 }
568 break;
569 default:
570 break;
571 }
572 break;
573 case GDK_SCROLL:
574 /* shift + wheel, pan left--right */
575 if (event->scroll.state & GDK_SHIFT_MASK) {
576 switch (event->scroll.direction) {
577 case GDK_SCROLL_UP:
578 desktop->scroll_world(wheel_scroll, 0);
579 break;
580 case GDK_SCROLL_DOWN:
581 desktop->scroll_world(-wheel_scroll, 0);
582 break;
583 default:
584 break;
585 }
587 /* ctrl + wheel, zoom in--out */
588 } else if (event->scroll.state & GDK_CONTROL_MASK) {
589 double rel_zoom;
590 switch (event->scroll.direction) {
591 case GDK_SCROLL_UP:
592 rel_zoom = zoom_inc;
593 break;
594 case GDK_SCROLL_DOWN:
595 rel_zoom = 1 / zoom_inc;
596 break;
597 default:
598 rel_zoom = 0.0;
599 break;
600 }
601 if (rel_zoom != 0.0) {
602 NR::Point const scroll_dt = desktop->point();
603 desktop->zoom_relative_keep_point(scroll_dt, rel_zoom);
604 }
606 /* no modifier, pan up--down (left--right on multiwheel mice?) */
607 } else {
608 switch (event->scroll.direction) {
609 case GDK_SCROLL_UP:
610 desktop->scroll_world(0, wheel_scroll);
611 break;
612 case GDK_SCROLL_DOWN:
613 desktop->scroll_world(0, -wheel_scroll);
614 break;
615 case GDK_SCROLL_LEFT:
616 desktop->scroll_world(wheel_scroll, 0);
617 break;
618 case GDK_SCROLL_RIGHT:
619 desktop->scroll_world(-wheel_scroll, 0);
620 break;
621 }
622 }
623 break;
624 default:
625 break;
626 }
628 return ret;
629 }
631 /**
632 * Handles item specific events. Gets called from Gdk.
633 *
634 * Only reacts to right mouse button at the moment.
635 * \todo Fixme: do context sensitive popup menu on items.
636 */
637 gint
638 sp_event_context_private_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
639 {
640 int ret = FALSE;
642 switch (event->type) {
643 case GDK_BUTTON_PRESS:
644 if ((event->button.button == 3)
645 && !(event->button.state & GDK_SHIFT_MASK || event->button.state & GDK_CONTROL_MASK)) {
646 sp_event_root_menu_popup(ec->desktop, item, event);
647 ret = TRUE;
648 }
649 break;
650 default:
651 break;
652 }
654 return ret;
655 }
657 /**
658 * Gets called when attribute changes value.
659 */
660 static void
661 sp_ec_repr_attr_changed(Inkscape::XML::Node *prefs_repr, gchar const *key, gchar const *oldval, gchar const *newval,
662 bool is_interactive, gpointer data)
663 {
664 SPEventContext *ec;
666 ec = SP_EVENT_CONTEXT(data);
668 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->set) {
669 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->set(ec, key, newval);
670 }
671 }
673 Inkscape::XML::NodeEventVector sp_ec_event_vector = {
674 NULL, /* Child added */
675 NULL, /* Child removed */
676 sp_ec_repr_attr_changed,
677 NULL, /* Content changed */
678 NULL /* Order changed */
679 };
681 /**
682 * Creates new SPEventContext object and calls its virtual setup() function.
683 */
684 SPEventContext *
685 sp_event_context_new(GType type, SPDesktop *desktop, Inkscape::XML::Node *prefs_repr, unsigned int key)
686 {
687 g_return_val_if_fail(g_type_is_a(type, SP_TYPE_EVENT_CONTEXT), NULL);
688 g_return_val_if_fail(desktop != NULL, NULL);
690 SPEventContext *const ec = (SPEventContext*)g_object_new(type, NULL);
692 ec->desktop = desktop;
693 ec->_message_context = new Inkscape::MessageContext(desktop->messageStack());
694 ec->key = key;
695 ec->prefs_repr = prefs_repr;
696 if (ec->prefs_repr) {
697 Inkscape::GC::anchor(ec->prefs_repr);
698 sp_repr_add_listener(ec->prefs_repr, &sp_ec_event_vector, ec);
699 }
701 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->setup)
702 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->setup(ec);
704 return ec;
705 }
707 /**
708 * Finishes SPEventContext.
709 */
710 void
711 sp_event_context_finish(SPEventContext *ec)
712 {
713 g_return_if_fail(ec != NULL);
714 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
716 ec->enableSelectionCue(false);
718 if (ec->next) {
719 g_warning("Finishing event context with active link\n");
720 }
722 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->finish)
723 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->finish(ec);
724 }
726 //-------------------------------member functions
728 /**
729 * Enables/disables the SPEventContext's SelCue.
730 */
731 void SPEventContext::enableSelectionCue(bool enable) {
732 if (enable) {
733 if (!_selcue) {
734 _selcue = new Inkscape::SelCue(desktop);
735 }
736 } else {
737 delete _selcue;
738 _selcue = NULL;
739 }
740 }
742 /**
743 * Enables/disables the SPEventContext's GrDrag.
744 */
745 void SPEventContext::enableGrDrag(bool enable) {
746 if (enable) {
747 if (!_grdrag) {
748 _grdrag = new GrDrag(desktop);
749 }
750 } else {
751 if (_grdrag) {
752 delete _grdrag;
753 _grdrag = NULL;
754 }
755 }
756 }
758 /**
759 * Calls virtual set() function of SPEventContext.
760 */
761 void
762 sp_event_context_read(SPEventContext *ec, gchar const *key)
763 {
764 g_return_if_fail(ec != NULL);
765 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
766 g_return_if_fail(key != NULL);
768 if (ec->prefs_repr) {
769 gchar const *val = ec->prefs_repr->attribute(key);
770 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->set)
771 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->set(ec, key, val);
772 }
773 }
775 /**
776 * Calls virtual activate() function of SPEventContext.
777 */
778 void
779 sp_event_context_activate(SPEventContext *ec)
780 {
781 g_return_if_fail(ec != NULL);
782 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
784 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->activate)
785 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->activate(ec);
786 }
788 /**
789 * Calls virtual deactivate() function of SPEventContext.
790 */
791 void
792 sp_event_context_deactivate(SPEventContext *ec)
793 {
794 g_return_if_fail(ec != NULL);
795 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
797 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->deactivate)
798 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->deactivate(ec);
799 }
801 /**
802 * Calls virtual root_handler(), the main event handling function.
803 */
804 gint
805 sp_event_context_root_handler(SPEventContext * event_context, GdkEvent * event)
806 {
807 gint ret;
809 ret = ((SPEventContextClass *) G_OBJECT_GET_CLASS(event_context))->root_handler(event_context, event);
811 set_event_location(event_context->desktop, event);
813 return ret;
814 }
816 /**
817 * Calls virtual item_handler(), the item event handling function.
818 */
819 gint
820 sp_event_context_item_handler(SPEventContext * event_context, SPItem * item, GdkEvent * event)
821 {
822 gint ret;
824 ret = ((SPEventContextClass *) G_OBJECT_GET_CLASS(event_context))->item_handler(event_context, item, event);
826 if (! ret) {
827 ret = sp_event_context_root_handler(event_context, event);
828 } else {
829 set_event_location(event_context->desktop, event);
830 }
832 return ret;
833 }
835 /**
836 * Emits 'position_set' signal on desktop and shows coordinates on status bar.
837 */
838 static void set_event_location(SPDesktop *desktop, GdkEvent *event)
839 {
840 if (event->type != GDK_MOTION_NOTIFY) {
841 return;
842 }
844 NR::Point const button_w(event->button.x, event->button.y);
845 NR::Point const button_dt(desktop->w2d(button_w));
846 desktop-> setPosition (button_dt);
847 desktop->set_coordinate_status(button_dt);
848 }
850 //-------------------------------------------------------------------
851 /**
852 * Create popup menu and tell Gtk to show it.
853 */
854 void
855 sp_event_root_menu_popup(SPDesktop *desktop, SPItem *item, GdkEvent *event)
856 {
857 GtkWidget *menu;
859 /* fixme: This is not what I want but works for now (Lauris) */
860 if (event->type == GDK_KEY_PRESS) {
861 item = sp_desktop_selection(desktop)->singleItem();
862 }
863 menu = sp_ui_context_menu(desktop, item);
864 gtk_widget_show(menu);
866 switch (event->type) {
867 case GDK_BUTTON_PRESS:
868 gtk_menu_popup(GTK_MENU(menu), NULL, NULL, 0, NULL, event->button.button, event->button.time);
869 break;
870 case GDK_KEY_PRESS:
871 gtk_menu_popup(GTK_MENU(menu), NULL, NULL, 0, NULL, 0, event->key.time);
872 break;
873 default:
874 break;
875 }
876 }
878 /**
879 * Show tool context specific modifier tip.
880 */
881 void
882 sp_event_show_modifier_tip(Inkscape::MessageContext *message_context,
883 GdkEvent *event, gchar const *ctrl_tip, gchar const *shift_tip,
884 gchar const *alt_tip)
885 {
886 guint keyval = get_group0_keyval(&event->key);
888 bool ctrl = ctrl_tip && (MOD__CTRL
889 || (keyval == GDK_Control_L)
890 || (keyval == GDK_Control_R));
891 bool shift = shift_tip
892 && (MOD__SHIFT || (keyval == GDK_Shift_L) || (keyval == GDK_Shift_R));
893 bool alt = alt_tip
894 && (MOD__ALT
895 || (keyval == GDK_Alt_L)
896 || (keyval == GDK_Alt_R)
897 || (keyval == GDK_Meta_L)
898 || (keyval == GDK_Meta_R));
900 gchar *tip = g_strdup_printf("%s%s%s%s%s",
901 ( ctrl ? ctrl_tip : "" ),
902 ( ctrl && (shift || alt) ? "; " : "" ),
903 ( shift ? shift_tip : "" ),
904 ( (ctrl || shift) && alt ? "; " : "" ),
905 ( alt ? alt_tip : "" ));
907 if (strlen(tip) > 0) {
908 message_context->flash(Inkscape::INFORMATION_MESSAGE, tip);
909 }
911 g_free(tip);
912 }
914 /**
915 * Return the keyval corresponding to the key event in group 0, i.e.,
916 * in the main (English) layout.
917 *
918 * Use this instead of simply event->keyval, so that your keyboard shortcuts
919 * work regardless of layouts (e.g., in Cyrillic).
920 */
921 guint
922 get_group0_keyval(GdkEventKey *event)
923 {
924 guint keyval = 0;
925 gdk_keymap_translate_keyboard_state(
926 gdk_keymap_get_for_display(gdk_display_get_default()),
927 event->hardware_keycode,
928 (GdkModifierType) event->state,
929 0 /*event->key.group*/,
930 &keyval, NULL, NULL, NULL);
931 return keyval;
932 }
934 /**
935 * Returns item at point p in desktop.
936 *
937 * If state includes alt key mask, cyclically selects under; honors
938 * into_groups.
939 */
940 SPItem *
941 sp_event_context_find_item (SPDesktop *desktop, NR::Point const p,
942 bool select_under, bool into_groups)
943 {
944 SPItem *item;
946 if (select_under) {
947 SPItem *selected_at_point =
948 desktop->item_from_list_at_point_bottom (desktop->selection->itemList(), p);
949 item = desktop->item_at_point(p, into_groups, selected_at_point);
950 if (item == NULL) { // we may have reached bottom, flip over to the top
951 item = desktop->item_at_point(p, into_groups, NULL);
952 }
953 } else
954 item = desktop->item_at_point(p, into_groups, NULL);
956 return item;
957 }
959 /**
960 * Returns item if it is under point p in desktop, at any depth; otherwise returns NULL.
961 *
962 * Honors into_groups.
963 */
964 SPItem *
965 sp_event_context_over_item (SPDesktop *desktop, SPItem *item, NR::Point const p)
966 {
967 GSList *temp = NULL;
968 temp = g_slist_prepend (temp, item);
969 SPItem *item_at_point = desktop->item_from_list_at_point_bottom (temp, p);
970 g_slist_free (temp);
972 return item_at_point;
973 }
975 /**
976 * Called when SPEventContext subclass node attribute changed.
977 */
978 void
979 ec_shape_event_attr_changed(Inkscape::XML::Node *shape_repr, gchar const *name,
980 gchar const *old_value, gchar const *new_value,
981 bool const is_interactive, gpointer const data)
982 {
983 if (!name
984 || !strcmp(name, "style")
985 || SP_ATTRIBUTE_IS_CSS(sp_attribute_lookup(name))) {
986 // no need to regenrate knotholder if only style changed
987 return;
988 }
990 SPEventContext *ec = SP_EVENT_CONTEXT(data);
992 if (ec->shape_knot_holder) {
993 sp_knot_holder_destroy(ec->shape_knot_holder);
994 }
995 ec->shape_knot_holder = NULL;
997 SPDesktop *desktop = ec->desktop;
999 SPItem *item = sp_desktop_selection(desktop)->singleItem();
1001 if (item) {
1002 ec->shape_knot_holder = sp_item_knot_holder(item, desktop);
1003 }
1004 }
1007 /*
1008 Local Variables:
1009 mode:c++
1010 c-file-style:"stroustrup"
1011 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1012 indent-tabs-mode:nil
1013 fill-column:99
1014 End:
1015 */
1016 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :