1 /** \file
2 * Main event handling, and related helper functions.
3 *
4 * Authors:
5 * Lauris Kaplinski <lauris@kaplinski.com>
6 * Frank Felfe <innerspace@iname.com>
7 * bulia byak <buliabyak@users.sf.net>
8 * Jon A. Cruz <jon@joncruz.org>
9 *
10 * Copyright (C) 1999-2010 authors
11 * Copyright (C) 2001-2002 Ximian, Inc.
12 *
13 * Released under GNU GPL, read the file 'COPYING' for more information
14 */
16 /** \class SPEventContext
17 * SPEventContext is an abstract base class of all tools. As the name
18 * indicates, event context implementations process UI events (mouse
19 * movements and keypresses) and take actions (like creating or modifying
20 * objects). There is one event context implementation for each tool,
21 * plus few abstract base classes. Writing a new tool involves
22 * subclassing SPEventContext.
23 */
25 #ifdef HAVE_CONFIG_H
26 # include "config.h"
27 #endif
29 #include "event-context.h"
31 #include <string.h>
32 #include <gdk/gdkkeysyms.h>
33 #include <gtk/gtkmain.h>
34 #include <gtk/gtkmenu.h>
35 #include <glibmm/i18n.h>
36 #include <cstring>
37 #include <string>
39 #include "display/sp-canvas.h"
40 #include "xml/node-event-vector.h"
41 #include "sp-cursor.h"
42 #include "shortcuts.h"
43 #include "desktop.h"
44 #include "desktop-handles.h"
45 #include "desktop-events.h"
46 #include "desktop-style.h"
47 #include "widgets/desktop-widget.h"
48 #include "sp-namedview.h"
49 #include "selection.h"
50 #include "file.h"
51 #include "interface.h"
52 #include "macros.h"
53 #include "tools-switch.h"
54 #include "preferences.h"
55 #include "message-context.h"
56 #include "gradient-drag.h"
57 #include "object-edit.h"
58 #include "attributes.h"
59 #include "rubberband.h"
60 #include "selcue.h"
61 #include "lpe-tool-context.h"
62 #include "ui/tool/control-point.h"
63 #include "shape-editor.h"
64 #include "sp-guide.h"
65 #include "color.h"
67 static void sp_event_context_class_init(SPEventContextClass *klass);
68 static void sp_event_context_init(SPEventContext *event_context);
69 static void sp_event_context_dispose(GObject *object);
71 static void sp_event_context_private_setup(SPEventContext *ec);
72 static gint sp_event_context_private_root_handler(
73 SPEventContext *event_context, GdkEvent *event);
74 static gint sp_event_context_private_item_handler(
75 SPEventContext *event_context, SPItem *item, GdkEvent *event);
77 static void set_event_location(SPDesktop * desktop, GdkEvent * event);
79 static GObjectClass *parent_class;
81 // globals for temporary switching to selector by space
82 static bool selector_toggled = FALSE;
83 static int switch_selector_to = 0;
85 // globals for temporary switching to dropper by 'D'
86 static bool dropper_toggled = FALSE;
87 static int switch_dropper_to = 0;
89 static gint xp = 0, yp = 0; // where drag started
90 static gint tolerance = 0;
91 static bool within_tolerance = false;
93 // globals for keeping track of keyboard scroll events in order to accelerate
94 static guint32 scroll_event_time = 0;
95 static gdouble scroll_multiply = 1;
96 static guint scroll_keyval = 0;
98 /**
99 * Registers the SPEventContext class with Glib and returns its type number.
100 */
101 GType sp_event_context_get_type(void) {
102 static GType type = 0;
103 if (!type) {
104 GTypeInfo info = { sizeof(SPEventContextClass), NULL, NULL,
105 (GClassInitFunc) sp_event_context_class_init, NULL, NULL,
106 sizeof(SPEventContext), 4,
107 (GInstanceInitFunc) sp_event_context_init, NULL, /* value_table */
108 };
109 type = g_type_register_static(G_TYPE_OBJECT, "SPEventContext", &info,
110 (GTypeFlags) 0);
111 }
112 return type;
113 }
115 /**
116 * Callback to set up the SPEventContext vtable.
117 */
118 static void sp_event_context_class_init(SPEventContextClass *klass) {
119 GObjectClass *object_class;
121 object_class = (GObjectClass *) klass;
123 parent_class = (GObjectClass*) g_type_class_peek_parent(klass);
125 object_class->dispose = sp_event_context_dispose;
127 klass->setup = sp_event_context_private_setup;
128 klass->root_handler = sp_event_context_private_root_handler;
129 klass->item_handler = sp_event_context_private_item_handler;
130 }
132 /**
133 * Clears all SPEventContext object members.
134 */
135 static void sp_event_context_init(SPEventContext *event_context) {
136 event_context->desktop = NULL;
137 event_context->cursor = NULL;
138 event_context->_message_context = NULL;
139 event_context->_selcue = NULL;
140 event_context->_grdrag = NULL;
141 event_context->space_panning = false;
142 event_context->shape_editor = NULL;
143 event_context->_delayed_snap_event = NULL;
144 event_context->_dse_callback_in_process = false;
145 event_context->tool_url = NULL;
146 }
148 /**
149 * Callback to free and null member variables of SPEventContext object.
150 */
151 static void sp_event_context_dispose(GObject *object) {
152 SPEventContext *ec;
154 ec = SP_EVENT_CONTEXT(object);
156 if (ec->_message_context) {
157 delete ec->_message_context;
158 }
160 if (ec->cursor != NULL) {
161 gdk_cursor_unref(ec->cursor);
162 ec->cursor = NULL;
163 }
165 if (ec->desktop) {
166 ec->desktop = NULL;
167 }
169 if (ec->pref_observer) {
170 delete ec->pref_observer;
171 }
173 if (ec->_delayed_snap_event) {
174 delete ec->_delayed_snap_event;
175 }
177 G_OBJECT_CLASS(parent_class)->dispose(object);
178 }
180 /**
181 * Recreates and draws cursor on desktop related to SPEventContext.
182 */
183 void sp_event_context_update_cursor(SPEventContext *ec) {
184 GtkWidget *w = GTK_WIDGET(sp_desktop_canvas(ec->desktop));
185 if (w->window) {
186 /* fixme: */
187 if (ec->cursor_shape) {
188 GdkDisplay *display = gdk_display_get_default();
189 if (ec->tool_url && gdk_display_supports_cursor_alpha(display) && gdk_display_supports_cursor_color(display)) {
190 bool fillHasColor=false, strokeHasColor=false;
191 guint32 fillColor = sp_desktop_get_color_tool(ec->desktop, ec->tool_url, true, &fillHasColor);
192 guint32 strokeColor = sp_desktop_get_color_tool(ec->desktop, ec->tool_url, false, &strokeHasColor);
193 double fillOpacity = fillHasColor ? sp_desktop_get_opacity_tool(ec->desktop, ec->tool_url, true) : 0;
194 double strokeOpacity = strokeHasColor ? sp_desktop_get_opacity_tool(ec->desktop, ec->tool_url, false) : 0;
195 GdkPixbuf *pixbuf = sp_cursor_pixbuf_from_xpm(
196 ec->cursor_shape,
197 w->style->black, w->style->white,
198 SP_RGBA32_U_COMPOSE(SP_RGBA32_R_U(fillColor),SP_RGBA32_G_U(fillColor),SP_RGBA32_B_U(fillColor),SP_COLOR_F_TO_U(fillOpacity)),
199 SP_RGBA32_U_COMPOSE(SP_RGBA32_R_U(strokeColor),SP_RGBA32_G_U(strokeColor),SP_RGBA32_B_U(strokeColor),SP_COLOR_F_TO_U(strokeOpacity))
200 );
201 if (pixbuf != NULL) {
202 if (ec->cursor)
203 gdk_cursor_unref(ec->cursor);
204 ec->cursor = gdk_cursor_new_from_pixbuf(display, pixbuf, ec->hot_x, ec->hot_y);
205 g_object_unref(pixbuf);
206 }
207 } else {
208 GdkBitmap *bitmap = NULL;
209 GdkBitmap *mask = NULL;
210 sp_cursor_bitmap_and_mask_from_xpm(&bitmap, &mask, ec->cursor_shape);
211 if ((bitmap != NULL) && (mask != NULL)) {
212 if (ec->cursor)
213 gdk_cursor_unref(ec->cursor);
214 ec->cursor = gdk_cursor_new_from_pixmap(bitmap, mask,
215 &w->style->black, &w->style->white, ec->hot_x,
216 ec->hot_y);
217 g_object_unref(bitmap);
218 g_object_unref(mask);
219 }
220 }
221 }
222 gdk_window_set_cursor(w->window, ec->cursor);
223 gdk_flush();
224 }
225 ec->desktop->waiting_cursor = false;
226 }
228 /**
229 * Callback that gets called on initialization of SPEventContext object.
230 * Redraws mouse cursor, at the moment.
231 */
232 static void sp_event_context_private_setup(SPEventContext *ec) {
233 sp_event_context_update_cursor(ec);
234 }
236 /**
237 * \brief Gobbles next key events on the queue with the same keyval and mask. Returns the number of events consumed.
238 */
239 gint gobble_key_events(guint keyval, gint mask) {
240 GdkEvent *event_next;
241 gint i = 0;
243 event_next = gdk_event_get();
244 // while the next event is also a key notify with the same keyval and mask,
245 while (event_next && (event_next->type == GDK_KEY_PRESS || event_next->type
246 == GDK_KEY_RELEASE) && event_next->key.keyval == keyval && (!mask
247 || (event_next->key.state & mask))) {
248 if (event_next->type == GDK_KEY_PRESS)
249 i++;
250 // kill it
251 gdk_event_free(event_next);
252 // get next
253 event_next = gdk_event_get();
254 }
255 // otherwise, put it back onto the queue
256 if (event_next)
257 gdk_event_put(event_next);
259 return i;
260 }
262 /**
263 * \brief Gobbles next motion notify events on the queue with the same mask. Returns the number of events consumed.
264 */
265 gint gobble_motion_events(gint mask) {
266 GdkEvent *event_next;
267 gint i = 0;
269 event_next = gdk_event_get();
270 // while the next event is also a key notify with the same keyval and mask,
271 while (event_next && event_next->type == GDK_MOTION_NOTIFY
272 && (event_next->motion.state & mask)) {
273 // kill it
274 gdk_event_free(event_next);
275 // get next
276 event_next = gdk_event_get();
277 i++;
278 }
279 // otherwise, put it back onto the queue
280 if (event_next)
281 gdk_event_put(event_next);
283 return i;
284 }
286 /**
287 * Toggles current tool between active tool and selector tool.
288 * Subroutine of sp_event_context_private_root_handler().
289 */
290 static void sp_toggle_selector(SPDesktop *dt) {
291 if (!dt->event_context)
292 return;
294 if (tools_isactive(dt, TOOLS_SELECT)) {
295 if (selector_toggled) {
296 if (switch_selector_to)
297 tools_switch(dt, switch_selector_to);
298 selector_toggled = FALSE;
299 } else
300 return;
301 } else {
302 selector_toggled = TRUE;
303 switch_selector_to = tools_active(dt);
304 tools_switch(dt, TOOLS_SELECT);
305 }
306 }
308 /**
309 * Toggles current tool between active tool and dropper tool.
310 * Subroutine of sp_event_context_private_root_handler().
311 */
312 static void sp_toggle_dropper(SPDesktop *dt) {
313 if (!dt->event_context)
314 return;
316 if (tools_isactive(dt, TOOLS_DROPPER)) {
317 if (dropper_toggled) {
318 if (switch_dropper_to)
319 tools_switch(dt, switch_dropper_to);
320 dropper_toggled = FALSE;
321 } else
322 return;
323 } else {
324 dropper_toggled = TRUE;
325 switch_dropper_to = tools_active(dt);
326 tools_switch(dt, TOOLS_DROPPER);
327 }
328 }
330 /**
331 * Calculates and keeps track of scroll acceleration.
332 * Subroutine of sp_event_context_private_root_handler().
333 */
334 static gdouble accelerate_scroll(GdkEvent *event, gdouble acceleration,
335 SPCanvas */*canvas*/) {
336 guint32 time_diff = ((GdkEventKey *) event)->time - scroll_event_time;
338 /* key pressed within 500ms ? (1/2 second) */
339 if (time_diff > 500 || event->key.keyval != scroll_keyval) {
340 scroll_multiply = 1; // abort acceleration
341 } else {
342 scroll_multiply += acceleration; // continue acceleration
343 }
345 scroll_event_time = ((GdkEventKey *) event)->time;
346 scroll_keyval = event->key.keyval;
348 return scroll_multiply;
349 }
351 /**
352 * Main event dispatch, gets called from Gdk.
353 */
354 static gint sp_event_context_private_root_handler(
355 SPEventContext *event_context, GdkEvent *event) {
356 static Geom::Point button_w;
357 static unsigned int panning = 0;
358 static unsigned int zoom_rb = 0;
360 SPDesktop *desktop = event_context->desktop;
361 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
363 /// @todo REmove redundant /value in preference keys
364 tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
366 gint ret = FALSE;
368 switch (event->type) {
369 case GDK_2BUTTON_PRESS:
370 if (panning) {
371 panning = 0;
372 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
373 event->button.time);
374 ret = TRUE;
375 } else {
376 /* sp_desktop_dialog(); */
377 }
378 break;
379 case GDK_BUTTON_PRESS:
381 // save drag origin
382 xp = (gint) event->button.x;
383 yp = (gint) event->button.y;
384 within_tolerance = true;
386 button_w = Geom::Point(event->button.x, event->button.y);
388 switch (event->button.button) {
389 case 1:
390 if (event_context->space_panning) {
391 // When starting panning, make sure there are no snap events pending because these might disable the panning again
392 sp_event_context_discard_delayed_snap_event(event_context);
393 panning = 1;
394 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
395 GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK
396 | GDK_POINTER_MOTION_MASK
397 | GDK_POINTER_MOTION_HINT_MASK, NULL,
398 event->button.time - 1);
399 ret = TRUE;
400 }
401 break;
402 case 2:
403 if (event->button.state & GDK_SHIFT_MASK) {
404 zoom_rb = 2;
405 } else {
406 // When starting panning, make sure there are no snap events pending because these might disable the panning again
407 sp_event_context_discard_delayed_snap_event(event_context);
408 panning = 2;
409 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
410 GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK
411 | GDK_POINTER_MOTION_HINT_MASK, NULL,
412 event->button.time - 1);
413 }
414 ret = TRUE;
415 break;
416 case 3:
417 if (event->button.state & GDK_SHIFT_MASK || event->button.state
418 & GDK_CONTROL_MASK) {
419 // When starting panning, make sure there are no snap events pending because these might disable the panning again
420 sp_event_context_discard_delayed_snap_event(event_context);
421 panning = 3;
422 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
423 GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK
424 | GDK_POINTER_MOTION_HINT_MASK, NULL,
425 event->button.time);
426 ret = TRUE;
427 } else {
428 sp_event_root_menu_popup(desktop, NULL, event);
429 }
430 break;
431 default:
432 break;
433 }
434 break;
435 case GDK_MOTION_NOTIFY:
436 if (panning) {
437 if ((panning == 2 && !(event->motion.state & GDK_BUTTON2_MASK))
438 || (panning == 1 && !(event->motion.state
439 & GDK_BUTTON1_MASK)) || (panning == 3
440 && !(event->motion.state & GDK_BUTTON3_MASK))) {
441 /* Gdk seems to lose button release for us sometimes :-( */
442 panning = 0;
443 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
444 event->button.time);
445 ret = TRUE;
446 } else {
447 if (within_tolerance && (abs((gint) event->motion.x - xp)
448 < tolerance) && (abs((gint) event->motion.y - yp)
449 < tolerance)) {
450 // do not drag if we're within tolerance from origin
451 break;
452 }
453 // Once the user has moved farther than tolerance from
454 // the original location (indicating they intend to move
455 // the object, not click), then always process the motion
456 // notify coordinates as given (no snapping back to origin)
457 within_tolerance = false;
459 // gobble subsequent motion events to prevent "sticking"
460 // when scrolling is slow
461 gobble_motion_events(panning == 2 ? GDK_BUTTON2_MASK : (panning
462 == 1 ? GDK_BUTTON1_MASK : GDK_BUTTON3_MASK));
464 Geom::Point const motion_w(event->motion.x, event->motion.y);
465 Geom::Point const moved_w(motion_w - button_w);
466 event_context->desktop->scroll_world(moved_w, true); // we're still scrolling, do not redraw
467 ret = TRUE;
468 }
469 } else if (zoom_rb) {
470 Geom::Point const motion_w(event->motion.x, event->motion.y);
471 Geom::Point const motion_dt(desktop->w2d(motion_w));
473 if (within_tolerance && (abs((gint) event->motion.x - xp)
474 < tolerance) && (abs((gint) event->motion.y - yp)
475 < tolerance)) {
476 break; // do not drag if we're within tolerance from origin
477 }
478 // Once the user has moved farther than tolerance from the original location
479 // (indicating they intend to move the object, not click), then always process the
480 // motion notify coordinates as given (no snapping back to origin)
481 within_tolerance = false;
483 if (Inkscape::Rubberband::get(desktop)->is_started()) {
484 Inkscape::Rubberband::get(desktop)->move(motion_dt);
485 } else {
486 Inkscape::Rubberband::get(desktop)->start(desktop, motion_dt);
487 }
488 if (zoom_rb == 2)
489 gobble_motion_events(GDK_BUTTON2_MASK);
490 }
491 break;
492 case GDK_BUTTON_RELEASE:
493 xp = yp = 0;
494 if (within_tolerance && (panning || zoom_rb)) {
495 zoom_rb = 0;
496 if (panning) {
497 panning = 0;
498 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
499 event->button.time);
500 }
501 Geom::Point const event_w(event->button.x, event->button.y);
502 Geom::Point const event_dt(desktop->w2d(event_w));
503 double const zoom_inc = prefs->getDoubleLimited(
504 "/options/zoomincrement/value", M_SQRT2, 1.01, 10);
505 desktop->zoom_relative_keep_point(event_dt, (event->button.state
506 & GDK_SHIFT_MASK) ? 1 / zoom_inc : zoom_inc);
507 desktop->updateNow();
508 ret = TRUE;
509 } else if (panning == event->button.button) {
510 panning = 0;
511 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
512 event->button.time);
514 // in slow complex drawings, some of the motion events are lost;
515 // to make up for this, we scroll it once again to the button-up event coordinates
516 // (i.e. canvas will always get scrolled all the way to the mouse release point,
517 // even if few intermediate steps were visible)
518 Geom::Point const motion_w(event->button.x, event->button.y);
519 Geom::Point const moved_w(motion_w - button_w);
520 event_context->desktop->scroll_world(moved_w);
521 desktop->updateNow();
522 ret = TRUE;
523 } else if (zoom_rb == event->button.button) {
524 zoom_rb = 0;
525 Geom::OptRect const b =
526 Inkscape::Rubberband::get(desktop)->getRectangle();
527 Inkscape::Rubberband::get(desktop)->stop();
528 if (b && !within_tolerance) {
529 desktop->set_display_area(*b, 10);
530 }
531 ret = TRUE;
532 }
533 break;
534 case GDK_KEY_PRESS: {
535 double const acceleration = prefs->getDoubleLimited(
536 "/options/scrollingacceleration/value", 0, 0, 6);
537 int const key_scroll = prefs->getIntLimited("/options/keyscroll/value",
538 10, 0, 1000);
540 switch (get_group0_keyval(&event->key)) {
541 // GDK insists on stealing these keys (F1 for no idea what, tab for cycling widgets
542 // in the editing window). So we resteal them back and run our regular shortcut
543 // invoker on them.
544 unsigned int shortcut;
545 case GDK_Tab:
546 case GDK_ISO_Left_Tab:
547 case GDK_F1:
548 shortcut = get_group0_keyval(&event->key);
549 if (event->key.state & GDK_SHIFT_MASK)
550 shortcut |= SP_SHORTCUT_SHIFT_MASK;
551 if (event->key.state & GDK_CONTROL_MASK)
552 shortcut |= SP_SHORTCUT_CONTROL_MASK;
553 if (event->key.state & GDK_MOD1_MASK)
554 shortcut |= SP_SHORTCUT_ALT_MASK;
555 ret = sp_shortcut_invoke(shortcut, desktop);
556 break;
558 case GDK_D:
559 case GDK_d:
560 if (!MOD__SHIFT && !MOD__CTRL && !MOD__ALT) {
561 sp_toggle_dropper(desktop);
562 ret = TRUE;
563 }
564 break;
565 case GDK_Q:
566 case GDK_q:
567 if (desktop->quick_zoomed()) {
568 ret = TRUE;
569 }
570 if (!MOD__SHIFT && !MOD__CTRL && !MOD__ALT) {
571 desktop->zoom_quick(true);
572 ret = TRUE;
573 }
574 break;
575 case GDK_W:
576 case GDK_w:
577 case GDK_F4:
578 /* Close view */
579 if (MOD__CTRL_ONLY) {
580 sp_ui_close_view(NULL);
581 ret = TRUE;
582 }
583 break;
584 case GDK_Left: // Ctrl Left
585 case GDK_KP_Left:
586 case GDK_KP_4:
587 if (MOD__CTRL_ONLY) {
588 int i = (int) floor(key_scroll * accelerate_scroll(event,
589 acceleration, sp_desktop_canvas(desktop)));
590 gobble_key_events(get_group0_keyval(&event->key), GDK_CONTROL_MASK);
591 event_context->desktop->scroll_world(i, 0);
592 ret = TRUE;
593 }
594 break;
595 case GDK_Up: // Ctrl Up
596 case GDK_KP_Up:
597 case GDK_KP_8:
598 if (MOD__CTRL_ONLY) {
599 int i = (int) floor(key_scroll * accelerate_scroll(event,
600 acceleration, sp_desktop_canvas(desktop)));
601 gobble_key_events(get_group0_keyval(&event->key), GDK_CONTROL_MASK);
602 event_context->desktop->scroll_world(0, i);
603 ret = TRUE;
604 }
605 break;
606 case GDK_Right: // Ctrl Right
607 case GDK_KP_Right:
608 case GDK_KP_6:
609 if (MOD__CTRL_ONLY) {
610 int i = (int) floor(key_scroll * accelerate_scroll(event,
611 acceleration, sp_desktop_canvas(desktop)));
612 gobble_key_events(get_group0_keyval(&event->key), GDK_CONTROL_MASK);
613 event_context->desktop->scroll_world(-i, 0);
614 ret = TRUE;
615 }
616 break;
617 case GDK_Down: // Ctrl Down
618 case GDK_KP_Down:
619 case GDK_KP_2:
620 if (MOD__CTRL_ONLY) {
621 int i = (int) floor(key_scroll * accelerate_scroll(event,
622 acceleration, sp_desktop_canvas(desktop)));
623 gobble_key_events(get_group0_keyval(&event->key), GDK_CONTROL_MASK);
624 event_context->desktop->scroll_world(0, -i);
625 ret = TRUE;
626 }
627 break;
628 case GDK_F10:
629 if (MOD__SHIFT_ONLY) {
630 sp_event_root_menu_popup(desktop, NULL, event);
631 ret = TRUE;
632 }
633 break;
634 case GDK_space:
635 if (prefs->getBool("/options/spacepans/value")) {
636 event_context->space_panning = true;
637 event_context->_message_context->set(Inkscape::INFORMATION_MESSAGE,
638 _("<b>Space+mouse drag</b> to pan canvas"));
639 ret = TRUE;
640 } else {
641 sp_toggle_selector(desktop);
642 ret = TRUE;
643 }
644 break;
645 case GDK_z:
646 case GDK_Z:
647 if (MOD__ALT_ONLY) {
648 desktop->zoom_grab_focus();
649 ret = TRUE;
650 }
651 break;
652 default:
653 break;
654 }
655 }
656 break;
657 case GDK_KEY_RELEASE:
658 switch (get_group0_keyval(&event->key)) {
659 case GDK_space:
660 if (event_context->space_panning) {
661 event_context->space_panning = false;
662 event_context->_message_context->clear();
663 if (panning == 1) {
664 panning = 0;
665 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
666 event->key.time);
667 desktop->updateNow();
668 }
669 ret = TRUE;
670 }
671 break;
672 case GDK_Q:
673 case GDK_q:
674 if (desktop->quick_zoomed()) {
675 desktop->zoom_quick(false);
676 ret = TRUE;
677 }
678 break;
679 default:
680 break;
681 }
682 break;
683 case GDK_SCROLL: {
684 bool ctrl = (event->scroll.state & GDK_CONTROL_MASK);
685 bool wheelzooms = prefs->getBool("/options/wheelzooms/value");
686 int const wheel_scroll = prefs->getIntLimited(
687 "/options/wheelscroll/value", 40, 0, 1000);
689 /* shift + wheel, pan left--right */
690 if (event->scroll.state & GDK_SHIFT_MASK) {
691 switch (event->scroll.direction) {
692 case GDK_SCROLL_UP:
693 desktop->scroll_world(wheel_scroll, 0);
694 break;
695 case GDK_SCROLL_DOWN:
696 desktop->scroll_world(-wheel_scroll, 0);
697 break;
698 default:
699 break;
700 }
702 /* ctrl + wheel, zoom in--out */
703 } else if ((ctrl && !wheelzooms) || (!ctrl && wheelzooms)) {
704 double rel_zoom;
705 double const zoom_inc = prefs->getDoubleLimited(
706 "/options/zoomincrement/value", M_SQRT2, 1.01, 10);
707 switch (event->scroll.direction) {
708 case GDK_SCROLL_UP:
709 rel_zoom = zoom_inc;
710 break;
711 case GDK_SCROLL_DOWN:
712 rel_zoom = 1 / zoom_inc;
713 break;
714 default:
715 rel_zoom = 0.0;
716 break;
717 }
718 if (rel_zoom != 0.0) {
719 Geom::Point const scroll_dt = desktop->point();
720 desktop->zoom_relative_keep_point(scroll_dt, rel_zoom);
721 }
723 /* no modifier, pan up--down (left--right on multiwheel mice?) */
724 } else {
725 switch (event->scroll.direction) {
726 case GDK_SCROLL_UP:
727 desktop->scroll_world(0, wheel_scroll);
728 break;
729 case GDK_SCROLL_DOWN:
730 desktop->scroll_world(0, -wheel_scroll);
731 break;
732 case GDK_SCROLL_LEFT:
733 desktop->scroll_world(wheel_scroll, 0);
734 break;
735 case GDK_SCROLL_RIGHT:
736 desktop->scroll_world(-wheel_scroll, 0);
737 break;
738 }
739 }
740 break;
741 }
742 default:
743 break;
744 }
746 return ret;
747 }
749 /**
750 * Handles item specific events. Gets called from Gdk.
751 *
752 * Only reacts to right mouse button at the moment.
753 * \todo Fixme: do context sensitive popup menu on items.
754 */
755 gint sp_event_context_private_item_handler(SPEventContext *ec, SPItem *item,
756 GdkEvent *event) {
757 int ret = FALSE;
759 switch (event->type) {
760 case GDK_BUTTON_PRESS:
761 if ((event->button.button == 3) && !(event->button.state
762 & GDK_SHIFT_MASK || event->button.state & GDK_CONTROL_MASK)) {
763 sp_event_root_menu_popup(ec->desktop, item, event);
764 ret = TRUE;
765 }
766 break;
767 default:
768 break;
769 }
771 return ret;
772 }
774 /**
775 * @brief: Returns true if we're hovering above a knot (needed because we don't want to pre-snap in that case)
776 */
778 bool sp_event_context_knot_mouseover(SPEventContext *ec)
779 {
780 if (ec->shape_editor) {
781 return ec->shape_editor->knot_mouseover();
782 }
784 return false;
785 }
787 /**
788 * @brief An observer that relays pref changes to the derived classes
789 */
790 class ToolPrefObserver: public Inkscape::Preferences::Observer {
791 public:
792 ToolPrefObserver(Glib::ustring const &path, SPEventContext *ec) :
793 Inkscape::Preferences::Observer(path), _ec(ec) {
794 }
795 virtual void notify(Inkscape::Preferences::Entry const &val) {
796 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(_ec))->set) {
797 ((SPEventContextClass *) G_OBJECT_GET_CLASS(_ec))->set(_ec,
798 const_cast<Inkscape::Preferences::Entry*> (&val));
799 }
800 }
801 private:
802 SPEventContext * const _ec;
803 };
805 /**
806 * Creates new SPEventContext object and calls its virtual setup() function.
807 * @todo This is bogus. pref_path should be a private property of the inheriting objects.
808 */
809 SPEventContext *
810 sp_event_context_new(GType type, SPDesktop *desktop, gchar const *pref_path,
811 unsigned int key) {
812 g_return_val_if_fail(g_type_is_a(type, SP_TYPE_EVENT_CONTEXT), NULL);
813 g_return_val_if_fail(desktop != NULL, NULL);
815 SPEventContext * const ec = (SPEventContext*) g_object_new(type, NULL);
817 ec->desktop = desktop;
818 ec->_message_context
819 = new Inkscape::MessageContext(desktop->messageStack());
820 ec->key = key;
821 ec->pref_observer = NULL;
823 if (pref_path) {
824 ec->pref_observer = new ToolPrefObserver(pref_path, ec);
826 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
827 prefs->addObserver(*(ec->pref_observer));
828 }
830 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->setup)
831 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->setup(ec);
833 return ec;
834 }
836 /**
837 * Finishes SPEventContext.
838 */
839 void sp_event_context_finish(SPEventContext *ec) {
840 g_return_if_fail(ec != NULL);
841 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
843 ec->enableSelectionCue(false);
845 if (ec->next) {
846 g_warning("Finishing event context with active link\n");
847 }
849 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->finish)
850 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->finish(ec);
851 }
853 //-------------------------------member functions
855 /**
856 * Enables/disables the SPEventContext's SelCue.
857 */
858 void SPEventContext::enableSelectionCue(bool enable) {
859 if (enable) {
860 if (!_selcue) {
861 _selcue = new Inkscape::SelCue(desktop);
862 }
863 } else {
864 delete _selcue;
865 _selcue = NULL;
866 }
867 }
869 /**
870 * Enables/disables the SPEventContext's GrDrag.
871 */
872 void SPEventContext::enableGrDrag(bool enable) {
873 if (enable) {
874 if (!_grdrag) {
875 _grdrag = new GrDrag(desktop);
876 }
877 } else {
878 if (_grdrag) {
879 delete _grdrag;
880 _grdrag = NULL;
881 }
882 }
883 }
885 /**
886 * Calls virtual set() function of SPEventContext.
887 */
888 void sp_event_context_read(SPEventContext *ec, gchar const *key) {
889 g_return_if_fail(ec != NULL);
890 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
891 g_return_if_fail(key != NULL);
893 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->set) {
894 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
895 Inkscape::Preferences::Entry val = prefs->getEntry(
896 ec->pref_observer->observed_path + '/' + key);
897 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->set(ec, &val);
898 }
899 }
901 /**
902 * Calls virtual activate() function of SPEventContext.
903 */
904 void sp_event_context_activate(SPEventContext *ec) {
905 g_return_if_fail(ec != NULL);
906 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
908 // Make sure no delayed snapping events are carried over after switching contexts
909 // (this is only an additional safety measure against sloppy coding, because each
910 // context should take care of this by itself.
911 sp_event_context_discard_delayed_snap_event(ec);
913 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->activate)
914 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->activate(ec);
915 }
917 /**
918 * Calls virtual deactivate() function of SPEventContext.
919 */
920 void sp_event_context_deactivate(SPEventContext *ec) {
921 g_return_if_fail(ec != NULL);
922 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
924 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->deactivate)
925 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->deactivate(ec);
926 }
928 /**
929 * Calls virtual root_handler(), the main event handling function.
930 */
931 gint sp_event_context_root_handler(SPEventContext * event_context,
932 GdkEvent * event)
933 {
934 switch (event->type) {
935 case GDK_MOTION_NOTIFY:
936 sp_event_context_snap_delay_handler(event_context, NULL, NULL,
937 (GdkEventMotion *) event,
938 DelayedSnapEvent::EVENTCONTEXT_ROOT_HANDLER);
939 break;
940 case GDK_BUTTON_RELEASE:
941 if (event_context->_delayed_snap_event) {
942 // If we have any pending snapping action, then invoke it now
943 sp_event_context_snap_watchdog_callback(
944 event_context->_delayed_snap_event);
945 }
946 break;
947 case GDK_BUTTON_PRESS:
948 case GDK_2BUTTON_PRESS:
949 case GDK_3BUTTON_PRESS:
950 // Snapping will be on hold if we're moving the mouse at high speeds. When starting
951 // drawing a new shape we really should snap though.
952 event_context->desktop->namedview->snap_manager.snapprefs.setSnapPostponedGlobally(
953 false);
954 break;
955 default:
956 break;
957 }
959 return sp_event_context_virtual_root_handler(event_context, event);
960 }
962 gint sp_event_context_virtual_root_handler(SPEventContext * event_context, GdkEvent * event) {
963 gint ret = false;
964 if (event_context) { // If no event-context is available then do nothing, otherwise Inkscape would crash
965 // (see the comment in SPDesktop::set_event_context, and bug LP #622350)
966 ret = ((SPEventContextClass *) G_OBJECT_GET_CLASS(event_context))->root_handler(event_context, event);
967 set_event_location(event_context->desktop, event);
968 }
969 return ret;
970 }
972 /**
973 * Calls virtual item_handler(), the item event handling function.
974 */
975 gint sp_event_context_item_handler(SPEventContext * event_context,
976 SPItem * item, GdkEvent * event) {
977 switch (event->type) {
978 case GDK_MOTION_NOTIFY:
979 sp_event_context_snap_delay_handler(event_context, (gpointer) item, NULL, (GdkEventMotion *) event, DelayedSnapEvent::EVENTCONTEXT_ITEM_HANDLER);
980 break;
981 case GDK_BUTTON_RELEASE:
982 if (event_context->_delayed_snap_event) {
983 // If we have any pending snapping action, then invoke it now
984 sp_event_context_snap_watchdog_callback(event_context->_delayed_snap_event);
985 }
986 break;
987 case GDK_BUTTON_PRESS:
988 case GDK_2BUTTON_PRESS:
989 case GDK_3BUTTON_PRESS:
990 // Snapping will be on hold if we're moving the mouse at high speeds. When starting
991 // drawing a new shape we really should snap though.
992 event_context->desktop->namedview->snap_manager.snapprefs.setSnapPostponedGlobally(false);
993 break;
994 default:
995 break;
996 }
998 return sp_event_context_virtual_item_handler(event_context, item, event);
999 }
1001 gint sp_event_context_virtual_item_handler(SPEventContext * event_context, SPItem * item, GdkEvent * event) {
1002 gint ret = false;
1003 if (event_context) { // If no event-context is available then do nothing, otherwise Inkscape would crash
1004 // (see the comment in SPDesktop::set_event_context, and bug LP #622350)
1005 ret = ((SPEventContextClass *) G_OBJECT_GET_CLASS(event_context))->item_handler(event_context, item, event);
1006 if (!ret) {
1007 ret = sp_event_context_virtual_root_handler(event_context, event);
1008 } else {
1009 set_event_location(event_context->desktop, event);
1010 }
1011 }
1013 return ret;
1014 }
1016 /**
1017 * Emits 'position_set' signal on desktop and shows coordinates on status bar.
1018 */
1019 static void set_event_location(SPDesktop *desktop, GdkEvent *event) {
1020 if (event->type != GDK_MOTION_NOTIFY) {
1021 return;
1022 }
1024 Geom::Point const button_w(event->button.x, event->button.y);
1025 Geom::Point const button_dt(desktop->w2d(button_w));
1026 desktop->setPosition(button_dt);
1027 desktop->set_coordinate_status(button_dt);
1028 }
1030 //-------------------------------------------------------------------
1031 /**
1032 * Create popup menu and tell Gtk to show it.
1033 */
1034 void sp_event_root_menu_popup(SPDesktop *desktop, SPItem *item, GdkEvent *event) {
1035 GtkWidget *menu;
1037 /* fixme: This is not what I want but works for now (Lauris) */
1038 if (event->type == GDK_KEY_PRESS) {
1039 item = sp_desktop_selection(desktop)->singleItem();
1040 }
1041 menu = sp_ui_context_menu(desktop, item);
1042 gtk_widget_show(menu);
1044 switch (event->type) {
1045 case GDK_BUTTON_PRESS:
1046 gtk_menu_popup(GTK_MENU(menu), NULL, NULL, 0, NULL,
1047 event->button.button, event->button.time);
1048 break;
1049 case GDK_KEY_PRESS:
1050 gtk_menu_popup(GTK_MENU(menu), NULL, NULL, 0, NULL, 0, event->key.time);
1051 break;
1052 default:
1053 break;
1054 }
1055 }
1057 /**
1058 * Show tool context specific modifier tip.
1059 */
1060 void sp_event_show_modifier_tip(Inkscape::MessageContext *message_context,
1061 GdkEvent *event, gchar const *ctrl_tip, gchar const *shift_tip,
1062 gchar const *alt_tip) {
1063 guint keyval = get_group0_keyval(&event->key);
1065 bool ctrl = ctrl_tip && (MOD__CTRL || (keyval == GDK_Control_L) || (keyval
1066 == GDK_Control_R));
1067 bool shift = shift_tip && (MOD__SHIFT || (keyval == GDK_Shift_L) || (keyval
1068 == GDK_Shift_R));
1069 bool alt = alt_tip && (MOD__ALT || (keyval == GDK_Alt_L) || (keyval
1070 == GDK_Alt_R) || (keyval == GDK_Meta_L) || (keyval == GDK_Meta_R));
1072 gchar *tip = g_strdup_printf("%s%s%s%s%s", (ctrl ? ctrl_tip : ""), (ctrl
1073 && (shift || alt) ? "; " : ""), (shift ? shift_tip : ""), ((ctrl
1074 || shift) && alt ? "; " : ""), (alt ? alt_tip : ""));
1076 if (strlen(tip) > 0) {
1077 message_context->flash(Inkscape::INFORMATION_MESSAGE, tip);
1078 }
1080 g_free(tip);
1081 }
1083 /**
1084 * Return the keyval corresponding to the key event in group 0, i.e.,
1085 * in the main (English) layout.
1086 *
1087 * Use this instead of simply event->keyval, so that your keyboard shortcuts
1088 * work regardless of layouts (e.g., in Cyrillic).
1089 */
1090 guint get_group0_keyval(GdkEventKey *event) {
1091 guint keyval = 0;
1092 gdk_keymap_translate_keyboard_state(gdk_keymap_get_for_display(
1093 gdk_display_get_default()), event->hardware_keycode,
1094 (GdkModifierType) event->state, 0 /*event->key.group*/, &keyval,
1095 NULL, NULL, NULL);
1096 return keyval;
1097 }
1099 /**
1100 * Returns item at point p in desktop.
1101 *
1102 * If state includes alt key mask, cyclically selects under; honors
1103 * into_groups.
1104 */
1105 SPItem *sp_event_context_find_item(SPDesktop *desktop, Geom::Point const &p,
1106 bool select_under, bool into_groups)
1107 {
1108 SPItem *item = 0;
1110 if (select_under) {
1111 SPItem *selected_at_point = desktop->getItemFromListAtPointBottom(
1112 desktop->selection->itemList(), p);
1113 item = desktop->getItemAtPoint(p, into_groups, selected_at_point);
1114 if (item == NULL) { // we may have reached bottom, flip over to the top
1115 item = desktop->getItemAtPoint(p, into_groups, NULL);
1116 }
1117 } else {
1118 item = desktop->getItemAtPoint(p, into_groups, NULL);
1119 }
1121 return item;
1122 }
1124 /**
1125 * Returns item if it is under point p in desktop, at any depth; otherwise returns NULL.
1126 *
1127 * Honors into_groups.
1128 */
1129 SPItem *
1130 sp_event_context_over_item(SPDesktop *desktop, SPItem *item,
1131 Geom::Point const &p) {
1132 GSList *temp = NULL;
1133 temp = g_slist_prepend(temp, item);
1134 SPItem *item_at_point = desktop->getItemFromListAtPointBottom(temp, p);
1135 g_slist_free(temp);
1137 return item_at_point;
1138 }
1140 ShapeEditor *
1141 sp_event_context_get_shape_editor(SPEventContext *ec) {
1142 return ec->shape_editor;
1143 }
1145 void event_context_print_event_info(GdkEvent *event, bool print_return) {
1146 switch (event->type) {
1147 case GDK_BUTTON_PRESS:
1148 g_print("GDK_BUTTON_PRESS");
1149 break;
1150 case GDK_2BUTTON_PRESS:
1151 g_print("GDK_2BUTTON_PRESS");
1152 break;
1153 case GDK_3BUTTON_PRESS:
1154 g_print("GDK_3BUTTON_PRESS");
1155 break;
1157 case GDK_MOTION_NOTIFY:
1158 g_print("GDK_MOTION_NOTIFY");
1159 break;
1160 case GDK_ENTER_NOTIFY:
1161 g_print("GDK_ENTER_NOTIFY");
1162 break;
1164 case GDK_LEAVE_NOTIFY:
1165 g_print("GDK_LEAVE_NOTIFY");
1166 break;
1167 case GDK_BUTTON_RELEASE:
1168 g_print("GDK_BUTTON_RELEASE");
1169 break;
1171 case GDK_KEY_PRESS:
1172 g_print("GDK_KEY_PRESS: %d", get_group0_keyval(&event->key));
1173 break;
1174 case GDK_KEY_RELEASE:
1175 g_print("GDK_KEY_RELEASE: %d", get_group0_keyval(&event->key));
1176 break;
1177 default:
1178 //g_print ("even type not recognized");
1179 break;
1180 }
1182 if (print_return) {
1183 g_print("\n");
1184 }
1185 }
1187 /**
1188 * \brief Analyses the current event, calculates the mouse speed, turns snapping off (temporarily) if the
1189 * mouse speed is above a threshold, and stores the current event such that it can be re-triggered when needed
1190 * (re-triggering is controlled by a watchdog timer)
1191 *
1192 * \param ec Pointer to the event context
1193 * \param dse_item Pointer that store a reference to a canvas or to an item
1194 * \param dse_item2 Another pointer, storing a reference to a knot or controlpoint
1195 * \param event Pointer to the motion event
1196 * \param origin Identifier (enum) specifying where the delay (and the call to this method) were initiated
1197 */
1198 void sp_event_context_snap_delay_handler(SPEventContext *ec,
1199 gpointer const dse_item, gpointer const dse_item2, GdkEventMotion *event,
1200 DelayedSnapEvent::DelayedSnapEventOrigin origin)
1201 {
1202 static guint32 prev_time;
1203 static boost::optional<Geom::Point> prev_pos;
1205 if (ec->_dse_callback_in_process) {
1206 return;
1207 }
1209 // Snapping occurs when dragging with the left mouse button down, or when hovering e.g. in the pen tool with left mouse button up
1210 bool const c1 = event->state & GDK_BUTTON2_MASK; // We shouldn't hold back any events when other mouse buttons have been
1211 bool const c2 = event->state & GDK_BUTTON3_MASK; // pressed, e.g. when scrolling with the middle mouse button; if we do then
1212 // Inkscape will get stuck in an unresponsive state
1213 bool const c3 = tools_isactive(ec->desktop, TOOLS_CALLIGRAPHIC);
1214 // The snap delay will repeat the last motion event, which will lead to
1215 // erroneous points in the calligraphy context. And because we don't snap
1216 // in this context, we might just as well disable the snap delay all together
1218 if (c1 || c2 || c3) {
1219 // Make sure that we don't send any pending snap events to a context if we know in advance
1220 // that we're not going to snap any way (e.g. while scrolling with middle mouse button)
1221 // Any motion event might affect the state of the context, leading to unexpected behavior
1222 sp_event_context_discard_delayed_snap_event(ec);
1223 } else if (ec->desktop
1224 && ec->desktop->namedview->snap_manager.snapprefs.getSnapEnabledGlobally()) {
1225 // Snap when speed drops below e.g. 0.02 px/msec, or when no motion events have occurred for some period.
1226 // i.e. snap when we're at stand still. A speed threshold enforces snapping for tablets, which might never
1227 // be fully at stand still and might keep spitting out motion events.
1228 ec->desktop->namedview->snap_manager.snapprefs.setSnapPostponedGlobally(true); // put snapping on hold
1230 Geom::Point event_pos(event->x, event->y);
1231 guint32 event_t = gdk_event_get_time((GdkEvent *) event);
1233 if (prev_pos) {
1234 Geom::Coord dist = Geom::L2(event_pos - *prev_pos);
1235 guint32 delta_t = event_t - prev_time;
1236 gdouble speed = delta_t > 0 ? dist / delta_t : 1000;
1237 //std::cout << "Mouse speed = " << speed << " px/msec " << std::endl;
1238 if (speed > 0.02) { // Jitter threshold, might be needed for tablets
1239 // We're moving fast, so postpone any snapping until the next GDK_MOTION_NOTIFY event. We
1240 // will keep on postponing the snapping as long as the speed is high.
1241 // We must snap at some point in time though, so set a watchdog timer at some time from
1242 // now, just in case there's no future motion event that drops under the speed limit (when
1243 // stopping abruptly)
1244 delete ec->_delayed_snap_event;
1245 ec->_delayed_snap_event = new DelayedSnapEvent(ec, dse_item, dse_item2,
1246 event, origin); // watchdog is reset, i.e. pushed forward in time
1247 // If the watchdog expires before a new motion event is received, we will snap (as explained
1248 // above). This means however that when the timer is too short, we will always snap and that the
1249 // speed threshold is ineffective. In the extreme case the delay is set to zero, and snapping will
1250 // be immediate, as it used to be in the old days ;-).
1251 } else { // Speed is very low, so we're virtually at stand still
1252 // But if we're really standing still, then we should snap now. We could use some low-pass filtering,
1253 // otherwise snapping occurs for each jitter movement. For this filtering we'll leave the watchdog to expire,
1254 // snap, and set a new watchdog again.
1255 if (ec->_delayed_snap_event == NULL) { // no watchdog has been set
1256 // it might have already expired, so we'll set a new one; the snapping frequency will be limited this way
1257 ec->_delayed_snap_event = new DelayedSnapEvent(ec, dse_item,
1258 dse_item2, event, origin);
1259 } // else: watchdog has been set before and we'll wait for it to expire
1260 }
1261 } else {
1262 // This is the first GDK_MOTION_NOTIFY event, so postpone snapping and set the watchdog
1263 g_assert(ec->_delayed_snap_event == NULL);
1264 ec->_delayed_snap_event = new DelayedSnapEvent(ec, dse_item, dse_item2,
1265 event, origin);
1266 }
1268 prev_pos = event_pos;
1269 prev_time = event_t;
1270 }
1271 }
1273 /**
1274 * \brief When the snap delay watchdog timer barks, this method will be called and will re-inject the last motion
1275 * event in an appropriate place, with snapping being turned on again
1276 */
1277 gboolean sp_event_context_snap_watchdog_callback(gpointer data) {
1278 // Snap NOW! For this the "postponed" flag will be reset and the last motion event will be repeated
1279 DelayedSnapEvent *dse = reinterpret_cast<DelayedSnapEvent*> (data);
1281 if (dse == NULL) {
1282 // This might occur when this method is called directly, i.e. not through the timer
1283 // E.g. on GDK_BUTTON_RELEASE in sp_event_context_root_handler()
1284 return FALSE;
1285 }
1287 SPEventContext *ec = dse->getEventContext();
1288 if (ec == NULL || ec->desktop == NULL) {
1289 return false;
1290 }
1291 ec->_dse_callback_in_process = true;
1293 SPDesktop *dt = ec->desktop;
1294 dt->namedview->snap_manager.snapprefs.setSnapPostponedGlobally(false);
1296 // Depending on where the delayed snap event originated from, we will inject it back at it's origin
1297 // The switch below takes care of that and prepares the relevant parameters
1298 switch (dse->getOrigin()) {
1299 case DelayedSnapEvent::EVENTCONTEXT_ROOT_HANDLER:
1300 sp_event_context_virtual_root_handler(ec, dse->getEvent());
1301 break;
1302 case DelayedSnapEvent::EVENTCONTEXT_ITEM_HANDLER: {
1303 SPItem* item = NULL;
1304 item = SP_ITEM(dse->getItem());
1305 if (item && SP_IS_ITEM(item)) {
1306 sp_event_context_virtual_item_handler(ec, item, dse->getEvent());
1307 }
1308 }
1309 break;
1310 case DelayedSnapEvent::KNOT_HANDLER: {
1311 SPKnot* knot = SP_KNOT(dse->getItem2());
1312 if (knot && SP_IS_KNOT(knot)) {
1313 sp_knot_handler_request_position(dse->getEvent(), knot);
1314 }
1315 }
1316 break;
1317 case DelayedSnapEvent::CONTROL_POINT_HANDLER: {
1318 using Inkscape::UI::ControlPoint;
1319 ControlPoint *point = reinterpret_cast<ControlPoint*> (dse->getItem2());
1320 point->_eventHandler(dse->getEvent());
1321 }
1322 break;
1323 case DelayedSnapEvent::GUIDE_HANDLER: {
1324 gpointer item = dse->getItem();
1325 gpointer item2 = dse->getItem2();
1326 if (item && item2) {
1327 g_assert(SP_IS_CANVAS_ITEM(item));
1328 g_assert(SP_IS_GUIDE(item2));
1329 sp_dt_guide_event(SP_CANVAS_ITEM(item), dse->getEvent(), item2);
1330 }
1331 }
1332 break;
1333 case DelayedSnapEvent::GUIDE_HRULER:
1334 case DelayedSnapEvent::GUIDE_VRULER: {
1335 gpointer item = dse->getItem();
1336 gpointer item2 = dse->getItem2();
1337 if (item && item2) {
1338 g_assert(GTK_IS_WIDGET(item));
1339 g_assert(SP_IS_DESKTOP_WIDGET(item2));
1340 if (dse->getOrigin() == DelayedSnapEvent::GUIDE_HRULER) {
1341 sp_dt_hruler_event(GTK_WIDGET(item), dse->getEvent(), SP_DESKTOP_WIDGET(item2));
1342 } else {
1343 sp_dt_vruler_event(GTK_WIDGET(item), dse->getEvent(), SP_DESKTOP_WIDGET(item2));
1344 }
1345 }
1346 }
1347 break;
1348 default:
1349 g_warning("Origin of snap-delay event has not been defined!;");
1350 break;
1351 }
1353 ec->_delayed_snap_event = NULL;
1354 delete dse;
1356 ec->_dse_callback_in_process = false;
1358 return FALSE; //Kills the timer and stops it from executing this callback over and over again.
1359 }
1361 void sp_event_context_discard_delayed_snap_event(SPEventContext *ec) {
1362 delete ec->_delayed_snap_event;
1363 ec->_delayed_snap_event = NULL;
1364 ec->desktop->namedview->snap_manager.snapprefs.setSnapPostponedGlobally(false);
1365 }
1367 /*
1368 Local Variables:
1369 mode:c++
1370 c-file-style:"stroustrup"
1371 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1372 indent-tabs-mode:nil
1373 fill-column:99
1374 End:
1375 */
1376 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :