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) 1999-2010 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 "event-context.h"
32 #include <string.h>
33 #include <gdk/gdkkeysyms.h>
34 #include <gtk/gtkmain.h>
35 #include <gtk/gtkmenu.h>
36 #include <glibmm/i18n.h>
37 #include <cstring>
38 #include <string>
40 #include "display/sp-canvas.h"
41 #include "xml/node-event-vector.h"
42 #include "sp-cursor.h"
43 #include "shortcuts.h"
44 #include "desktop.h"
45 #include "desktop-handles.h"
46 #include "desktop-events.h"
47 #include "desktop-style.h"
48 #include "widgets/desktop-widget.h"
49 #include "sp-namedview.h"
50 #include "selection.h"
51 #include "file.h"
52 #include "interface.h"
53 #include "macros.h"
54 #include "tools-switch.h"
55 #include "preferences.h"
56 #include "message-context.h"
57 #include "gradient-drag.h"
58 #include "object-edit.h"
59 #include "attributes.h"
60 #include "rubberband.h"
61 #include "selcue.h"
62 #include "lpe-tool-context.h"
63 #include "ui/tool/control-point.h"
64 #include "shape-editor.h"
65 #include "sp-guide.h"
66 #include "color.h"
68 static void sp_event_context_class_init(SPEventContextClass *klass);
69 static void sp_event_context_init(SPEventContext *event_context);
70 static void sp_event_context_dispose(GObject *object);
72 static void sp_event_context_private_setup(SPEventContext *ec);
73 static gint sp_event_context_private_root_handler(
74 SPEventContext *event_context, GdkEvent *event);
75 static gint sp_event_context_private_item_handler(
76 SPEventContext *event_context, SPItem *item, GdkEvent *event);
78 static void set_event_location(SPDesktop * desktop, GdkEvent * event);
80 static GObjectClass *parent_class;
82 // globals for temporary switching to selector by space
83 static bool selector_toggled = FALSE;
84 static int switch_selector_to = 0;
86 // globals for temporary switching to dropper by 'D'
87 static bool dropper_toggled = FALSE;
88 static int switch_dropper_to = 0;
90 static gint xp = 0, yp = 0; // where drag started
91 static gint tolerance = 0;
92 static bool within_tolerance = false;
94 // globals for keeping track of keyboard scroll events in order to accelerate
95 static guint32 scroll_event_time = 0;
96 static gdouble scroll_multiply = 1;
97 static guint scroll_keyval = 0;
99 /**
100 * Registers the SPEventContext class with Glib and returns its type number.
101 */
102 GType sp_event_context_get_type(void) {
103 static GType type = 0;
104 if (!type) {
105 GTypeInfo info = { sizeof(SPEventContextClass), NULL, NULL,
106 (GClassInitFunc) sp_event_context_class_init, NULL, NULL,
107 sizeof(SPEventContext), 4,
108 (GInstanceInitFunc) sp_event_context_init, NULL, /* value_table */
109 };
110 type = g_type_register_static(G_TYPE_OBJECT, "SPEventContext", &info,
111 (GTypeFlags) 0);
112 }
113 return type;
114 }
116 /**
117 * Callback to set up the SPEventContext vtable.
118 */
119 static void sp_event_context_class_init(SPEventContextClass *klass) {
120 GObjectClass *object_class;
122 object_class = (GObjectClass *) klass;
124 parent_class = (GObjectClass*) g_type_class_peek_parent(klass);
126 object_class->dispose = sp_event_context_dispose;
128 klass->setup = sp_event_context_private_setup;
129 klass->root_handler = sp_event_context_private_root_handler;
130 klass->item_handler = sp_event_context_private_item_handler;
131 }
133 /**
134 * Clears all SPEventContext object members.
135 */
136 static void sp_event_context_init(SPEventContext *event_context) {
137 event_context->desktop = NULL;
138 event_context->cursor = NULL;
139 event_context->_message_context = NULL;
140 event_context->_selcue = NULL;
141 event_context->_grdrag = NULL;
142 event_context->space_panning = false;
143 event_context->shape_editor = NULL;
144 event_context->_delayed_snap_event = NULL;
145 event_context->_dse_callback_in_process = false;
146 event_context->tool_url = NULL;
147 }
149 /**
150 * Callback to free and null member variables of SPEventContext object.
151 */
152 static void sp_event_context_dispose(GObject *object) {
153 SPEventContext *ec;
155 ec = SP_EVENT_CONTEXT(object);
157 if (ec->_message_context) {
158 delete ec->_message_context;
159 }
161 if (ec->cursor != NULL) {
162 gdk_cursor_unref(ec->cursor);
163 ec->cursor = NULL;
164 }
166 if (ec->desktop) {
167 ec->desktop = NULL;
168 }
170 if (ec->pref_observer) {
171 delete ec->pref_observer;
172 }
174 if (ec->_delayed_snap_event) {
175 delete ec->_delayed_snap_event;
176 }
178 G_OBJECT_CLASS(parent_class)->dispose(object);
179 }
181 /**
182 * Recreates and draws cursor on desktop related to SPEventContext.
183 */
184 void sp_event_context_update_cursor(SPEventContext *ec) {
185 GtkWidget *w = GTK_WIDGET(sp_desktop_canvas(ec->desktop));
186 if (w->window) {
187 /* fixme: */
188 if (ec->cursor_shape) {
189 GdkDisplay *display = gdk_display_get_default();
190 if (ec->tool_url && gdk_display_supports_cursor_alpha(display) && gdk_display_supports_cursor_color(display)) {
191 bool fillHasColor=false, strokeHasColor=false;
192 guint32 fillColor = sp_desktop_get_color_tool(ec->desktop, ec->tool_url, true, &fillHasColor);
193 guint32 strokeColor = sp_desktop_get_color_tool(ec->desktop, ec->tool_url, false, &strokeHasColor);
194 double fillOpacity = fillHasColor ? sp_desktop_get_opacity_tool(ec->desktop, ec->tool_url, true) : 0;
195 double strokeOpacity = strokeHasColor ? sp_desktop_get_opacity_tool(ec->desktop, ec->tool_url, false) : 0;
196 GdkPixbuf *pixbuf = sp_cursor_pixbuf_from_xpm(
197 ec->cursor_shape,
198 w->style->black, w->style->white,
199 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)),
200 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))
201 );
202 if (pixbuf != NULL) {
203 if (ec->cursor)
204 gdk_cursor_unref(ec->cursor);
205 ec->cursor = gdk_cursor_new_from_pixbuf(display, pixbuf, ec->hot_x, ec->hot_y);
206 g_object_unref(pixbuf);
207 }
208 } else {
209 GdkBitmap *bitmap = NULL;
210 GdkBitmap *mask = NULL;
211 sp_cursor_bitmap_and_mask_from_xpm(&bitmap, &mask, ec->cursor_shape);
212 if ((bitmap != NULL) && (mask != NULL)) {
213 if (ec->cursor)
214 gdk_cursor_unref(ec->cursor);
215 ec->cursor = gdk_cursor_new_from_pixmap(bitmap, mask,
216 &w->style->black, &w->style->white, ec->hot_x,
217 ec->hot_y);
218 g_object_unref(bitmap);
219 g_object_unref(mask);
220 }
221 }
222 }
223 gdk_window_set_cursor(w->window, ec->cursor);
224 gdk_flush();
225 }
226 ec->desktop->waiting_cursor = false;
227 }
229 /**
230 * Callback that gets called on initialization of SPEventContext object.
231 * Redraws mouse cursor, at the moment.
232 */
233 static void sp_event_context_private_setup(SPEventContext *ec) {
234 sp_event_context_update_cursor(ec);
235 }
237 /**
238 * \brief Gobbles next key events on the queue with the same keyval and mask. Returns the number of events consumed.
239 */
240 gint gobble_key_events(guint keyval, gint mask) {
241 GdkEvent *event_next;
242 gint i = 0;
244 event_next = gdk_event_get();
245 // while the next event is also a key notify with the same keyval and mask,
246 while (event_next && (event_next->type == GDK_KEY_PRESS || event_next->type
247 == GDK_KEY_RELEASE) && event_next->key.keyval == keyval && (!mask
248 || (event_next->key.state & mask))) {
249 if (event_next->type == GDK_KEY_PRESS)
250 i++;
251 // kill it
252 gdk_event_free(event_next);
253 // get next
254 event_next = gdk_event_get();
255 }
256 // otherwise, put it back onto the queue
257 if (event_next)
258 gdk_event_put(event_next);
260 return i;
261 }
263 /**
264 * \brief Gobbles next motion notify events on the queue with the same mask. Returns the number of events consumed.
265 */
266 gint gobble_motion_events(gint mask) {
267 GdkEvent *event_next;
268 gint i = 0;
270 event_next = gdk_event_get();
271 // while the next event is also a key notify with the same keyval and mask,
272 while (event_next && event_next->type == GDK_MOTION_NOTIFY
273 && (event_next->motion.state & mask)) {
274 // kill it
275 gdk_event_free(event_next);
276 // get next
277 event_next = gdk_event_get();
278 i++;
279 }
280 // otherwise, put it back onto the queue
281 if (event_next)
282 gdk_event_put(event_next);
284 return i;
285 }
287 /**
288 * Toggles current tool between active tool and selector tool.
289 * Subroutine of sp_event_context_private_root_handler().
290 */
291 static void sp_toggle_selector(SPDesktop *dt) {
292 if (!dt->event_context)
293 return;
295 if (tools_isactive(dt, TOOLS_SELECT)) {
296 if (selector_toggled) {
297 if (switch_selector_to)
298 tools_switch(dt, switch_selector_to);
299 selector_toggled = FALSE;
300 } else
301 return;
302 } else {
303 selector_toggled = TRUE;
304 switch_selector_to = tools_active(dt);
305 tools_switch(dt, TOOLS_SELECT);
306 }
307 }
309 /**
310 * Toggles current tool between active tool and dropper tool.
311 * Subroutine of sp_event_context_private_root_handler().
312 */
313 static void sp_toggle_dropper(SPDesktop *dt) {
314 if (!dt->event_context)
315 return;
317 if (tools_isactive(dt, TOOLS_DROPPER)) {
318 if (dropper_toggled) {
319 if (switch_dropper_to)
320 tools_switch(dt, switch_dropper_to);
321 dropper_toggled = FALSE;
322 } else
323 return;
324 } else {
325 dropper_toggled = TRUE;
326 switch_dropper_to = tools_active(dt);
327 tools_switch(dt, TOOLS_DROPPER);
328 }
329 }
331 /**
332 * Calculates and keeps track of scroll acceleration.
333 * Subroutine of sp_event_context_private_root_handler().
334 */
335 static gdouble accelerate_scroll(GdkEvent *event, gdouble acceleration,
336 SPCanvas */*canvas*/) {
337 guint32 time_diff = ((GdkEventKey *) event)->time - scroll_event_time;
339 /* key pressed within 500ms ? (1/2 second) */
340 if (time_diff > 500 || event->key.keyval != scroll_keyval) {
341 scroll_multiply = 1; // abort acceleration
342 } else {
343 scroll_multiply += acceleration; // continue acceleration
344 }
346 scroll_event_time = ((GdkEventKey *) event)->time;
347 scroll_keyval = event->key.keyval;
349 return scroll_multiply;
350 }
352 /**
353 * Main event dispatch, gets called from Gdk.
354 */
355 static gint sp_event_context_private_root_handler(
356 SPEventContext *event_context, GdkEvent *event) {
357 static Geom::Point button_w;
358 static unsigned int panning = 0;
359 static unsigned int zoom_rb = 0;
361 SPDesktop *desktop = event_context->desktop;
362 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
364 /// @todo REmove redundant /value in preference keys
365 tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
367 gint ret = FALSE;
369 switch (event->type) {
370 case GDK_2BUTTON_PRESS:
371 if (panning) {
372 panning = 0;
373 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
374 event->button.time);
375 ret = TRUE;
376 } else {
377 /* sp_desktop_dialog(); */
378 }
379 break;
380 case GDK_BUTTON_PRESS:
382 // save drag origin
383 xp = (gint) event->button.x;
384 yp = (gint) event->button.y;
385 within_tolerance = true;
387 button_w = Geom::Point(event->button.x, event->button.y);
389 switch (event->button.button) {
390 case 1:
391 if (event_context->space_panning) {
392 // When starting panning, make sure there are no snap events pending because these might disable the panning again
393 sp_event_context_discard_delayed_snap_event(event_context);
394 panning = 1;
395 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
396 GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK
397 | GDK_POINTER_MOTION_MASK
398 | GDK_POINTER_MOTION_HINT_MASK, NULL,
399 event->button.time - 1);
400 ret = TRUE;
401 }
402 break;
403 case 2:
404 if (event->button.state & GDK_SHIFT_MASK) {
405 zoom_rb = 2;
406 } else {
407 // When starting panning, make sure there are no snap events pending because these might disable the panning again
408 sp_event_context_discard_delayed_snap_event(event_context);
409 panning = 2;
410 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
411 GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK
412 | GDK_POINTER_MOTION_HINT_MASK, NULL,
413 event->button.time - 1);
414 }
415 ret = TRUE;
416 break;
417 case 3:
418 if (event->button.state & GDK_SHIFT_MASK || event->button.state
419 & GDK_CONTROL_MASK) {
420 // When starting panning, make sure there are no snap events pending because these might disable the panning again
421 sp_event_context_discard_delayed_snap_event(event_context);
422 panning = 3;
423 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
424 GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK
425 | GDK_POINTER_MOTION_HINT_MASK, NULL,
426 event->button.time);
427 ret = TRUE;
428 } else {
429 sp_event_root_menu_popup(desktop, NULL, event);
430 }
431 break;
432 default:
433 break;
434 }
435 break;
436 case GDK_MOTION_NOTIFY:
437 if (panning) {
438 if ((panning == 2 && !(event->motion.state & GDK_BUTTON2_MASK))
439 || (panning == 1 && !(event->motion.state
440 & GDK_BUTTON1_MASK)) || (panning == 3
441 && !(event->motion.state & GDK_BUTTON3_MASK))) {
442 /* Gdk seems to lose button release for us sometimes :-( */
443 panning = 0;
444 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
445 event->button.time);
446 ret = TRUE;
447 } else {
448 if (within_tolerance && (abs((gint) event->motion.x - xp)
449 < tolerance) && (abs((gint) event->motion.y - yp)
450 < tolerance)) {
451 // do not drag if we're within tolerance from origin
452 break;
453 }
454 // Once the user has moved farther than tolerance from
455 // the original location (indicating they intend to move
456 // the object, not click), then always process the motion
457 // notify coordinates as given (no snapping back to origin)
458 within_tolerance = false;
460 // gobble subsequent motion events to prevent "sticking"
461 // when scrolling is slow
462 gobble_motion_events(panning == 2 ? GDK_BUTTON2_MASK : (panning
463 == 1 ? GDK_BUTTON1_MASK : GDK_BUTTON3_MASK));
465 Geom::Point const motion_w(event->motion.x, event->motion.y);
466 Geom::Point const moved_w(motion_w - button_w);
467 event_context->desktop->scroll_world(moved_w, true); // we're still scrolling, do not redraw
468 ret = TRUE;
469 }
470 } else if (zoom_rb) {
471 Geom::Point const motion_w(event->motion.x, event->motion.y);
472 Geom::Point const motion_dt(desktop->w2d(motion_w));
474 if (within_tolerance && (abs((gint) event->motion.x - xp)
475 < tolerance) && (abs((gint) event->motion.y - yp)
476 < tolerance)) {
477 break; // do not drag if we're within tolerance from origin
478 }
479 // Once the user has moved farther than tolerance from the original location
480 // (indicating they intend to move the object, not click), then always process the
481 // motion notify coordinates as given (no snapping back to origin)
482 within_tolerance = false;
484 if (Inkscape::Rubberband::get(desktop)->is_started()) {
485 Inkscape::Rubberband::get(desktop)->move(motion_dt);
486 } else {
487 Inkscape::Rubberband::get(desktop)->start(desktop, motion_dt);
488 }
489 if (zoom_rb == 2)
490 gobble_motion_events(GDK_BUTTON2_MASK);
491 }
492 break;
493 case GDK_BUTTON_RELEASE:
494 xp = yp = 0;
495 if (within_tolerance && (panning || zoom_rb)) {
496 zoom_rb = 0;
497 if (panning) {
498 panning = 0;
499 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
500 event->button.time);
501 }
502 Geom::Point const event_w(event->button.x, event->button.y);
503 Geom::Point const event_dt(desktop->w2d(event_w));
504 double const zoom_inc = prefs->getDoubleLimited(
505 "/options/zoomincrement/value", M_SQRT2, 1.01, 10);
506 desktop->zoom_relative_keep_point(event_dt, (event->button.state
507 & GDK_SHIFT_MASK) ? 1 / zoom_inc : zoom_inc);
508 desktop->updateNow();
509 ret = TRUE;
510 } else if (panning == event->button.button) {
511 panning = 0;
512 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
513 event->button.time);
515 // in slow complex drawings, some of the motion events are lost;
516 // to make up for this, we scroll it once again to the button-up event coordinates
517 // (i.e. canvas will always get scrolled all the way to the mouse release point,
518 // even if few intermediate steps were visible)
519 Geom::Point const motion_w(event->button.x, event->button.y);
520 Geom::Point const moved_w(motion_w - button_w);
521 event_context->desktop->scroll_world(moved_w);
522 desktop->updateNow();
523 ret = TRUE;
524 } else if (zoom_rb == event->button.button) {
525 zoom_rb = 0;
526 Geom::OptRect const b =
527 Inkscape::Rubberband::get(desktop)->getRectangle();
528 Inkscape::Rubberband::get(desktop)->stop();
529 if (b && !within_tolerance) {
530 desktop->set_display_area(*b, 10);
531 }
532 ret = TRUE;
533 }
534 break;
535 case GDK_KEY_PRESS: {
536 double const acceleration = prefs->getDoubleLimited(
537 "/options/scrollingacceleration/value", 0, 0, 6);
538 int const key_scroll = prefs->getIntLimited("/options/keyscroll/value",
539 10, 0, 1000);
541 switch (get_group0_keyval(&event->key)) {
542 // GDK insists on stealing these keys (F1 for no idea what, tab for cycling widgets
543 // in the editing window). So we resteal them back and run our regular shortcut
544 // invoker on them.
545 unsigned int shortcut;
546 case GDK_Tab:
547 case GDK_ISO_Left_Tab:
548 case GDK_F1:
549 shortcut = get_group0_keyval(&event->key);
550 if (event->key.state & GDK_SHIFT_MASK)
551 shortcut |= SP_SHORTCUT_SHIFT_MASK;
552 if (event->key.state & GDK_CONTROL_MASK)
553 shortcut |= SP_SHORTCUT_CONTROL_MASK;
554 if (event->key.state & GDK_MOD1_MASK)
555 shortcut |= SP_SHORTCUT_ALT_MASK;
556 ret = sp_shortcut_invoke(shortcut, desktop);
557 break;
559 case GDK_D:
560 case GDK_d:
561 if (!MOD__SHIFT && !MOD__CTRL && !MOD__ALT) {
562 sp_toggle_dropper(desktop);
563 ret = TRUE;
564 }
565 break;
566 case GDK_Q:
567 case GDK_q:
568 if (desktop->quick_zoomed()) {
569 ret = TRUE;
570 }
571 if (!MOD__SHIFT && !MOD__CTRL && !MOD__ALT) {
572 desktop->zoom_quick(true);
573 ret = TRUE;
574 }
575 break;
576 case GDK_W:
577 case GDK_w:
578 case GDK_F4:
579 /* Close view */
580 if (MOD__CTRL_ONLY) {
581 sp_ui_close_view(NULL);
582 ret = TRUE;
583 }
584 break;
585 case GDK_Left: // Ctrl Left
586 case GDK_KP_Left:
587 case GDK_KP_4:
588 if (MOD__CTRL_ONLY) {
589 int i = (int) floor(key_scroll * accelerate_scroll(event,
590 acceleration, sp_desktop_canvas(desktop)));
591 gobble_key_events(get_group0_keyval(&event->key), GDK_CONTROL_MASK);
592 event_context->desktop->scroll_world(i, 0);
593 ret = TRUE;
594 }
595 break;
596 case GDK_Up: // Ctrl Up
597 case GDK_KP_Up:
598 case GDK_KP_8:
599 if (MOD__CTRL_ONLY) {
600 int i = (int) floor(key_scroll * accelerate_scroll(event,
601 acceleration, sp_desktop_canvas(desktop)));
602 gobble_key_events(get_group0_keyval(&event->key), GDK_CONTROL_MASK);
603 event_context->desktop->scroll_world(0, i);
604 ret = TRUE;
605 }
606 break;
607 case GDK_Right: // Ctrl Right
608 case GDK_KP_Right:
609 case GDK_KP_6:
610 if (MOD__CTRL_ONLY) {
611 int i = (int) floor(key_scroll * accelerate_scroll(event,
612 acceleration, sp_desktop_canvas(desktop)));
613 gobble_key_events(get_group0_keyval(&event->key), GDK_CONTROL_MASK);
614 event_context->desktop->scroll_world(-i, 0);
615 ret = TRUE;
616 }
617 break;
618 case GDK_Down: // Ctrl Down
619 case GDK_KP_Down:
620 case GDK_KP_2:
621 if (MOD__CTRL_ONLY) {
622 int i = (int) floor(key_scroll * accelerate_scroll(event,
623 acceleration, sp_desktop_canvas(desktop)));
624 gobble_key_events(get_group0_keyval(&event->key), GDK_CONTROL_MASK);
625 event_context->desktop->scroll_world(0, -i);
626 ret = TRUE;
627 }
628 break;
629 case GDK_F10:
630 if (MOD__SHIFT_ONLY) {
631 sp_event_root_menu_popup(desktop, NULL, event);
632 ret = TRUE;
633 }
634 break;
635 case GDK_space:
636 if (prefs->getBool("/options/spacepans/value")) {
637 event_context->space_panning = true;
638 event_context->_message_context->set(Inkscape::INFORMATION_MESSAGE,
639 _("<b>Space+mouse drag</b> to pan canvas"));
640 ret = TRUE;
641 } else {
642 sp_toggle_selector(desktop);
643 ret = TRUE;
644 }
645 break;
646 case GDK_z:
647 case GDK_Z:
648 if (MOD__ALT_ONLY) {
649 desktop->zoom_grab_focus();
650 ret = TRUE;
651 }
652 break;
653 default:
654 break;
655 }
656 }
657 break;
658 case GDK_KEY_RELEASE:
659 switch (get_group0_keyval(&event->key)) {
660 case GDK_space:
661 if (event_context->space_panning) {
662 event_context->space_panning = false;
663 event_context->_message_context->clear();
664 if (panning == 1) {
665 panning = 0;
666 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
667 event->key.time);
668 desktop->updateNow();
669 }
670 ret = TRUE;
671 }
672 break;
673 case GDK_Q:
674 case GDK_q:
675 if (desktop->quick_zoomed()) {
676 desktop->zoom_quick(false);
677 ret = TRUE;
678 }
679 break;
680 default:
681 break;
682 }
683 break;
684 case GDK_SCROLL: {
685 bool ctrl = (event->scroll.state & GDK_CONTROL_MASK);
686 bool wheelzooms = prefs->getBool("/options/wheelzooms/value");
687 int const wheel_scroll = prefs->getIntLimited(
688 "/options/wheelscroll/value", 40, 0, 1000);
690 /* shift + wheel, pan left--right */
691 if (event->scroll.state & GDK_SHIFT_MASK) {
692 switch (event->scroll.direction) {
693 case GDK_SCROLL_UP:
694 desktop->scroll_world(wheel_scroll, 0);
695 break;
696 case GDK_SCROLL_DOWN:
697 desktop->scroll_world(-wheel_scroll, 0);
698 break;
699 default:
700 break;
701 }
703 /* ctrl + wheel, zoom in--out */
704 } else if ((ctrl && !wheelzooms) || (!ctrl && wheelzooms)) {
705 double rel_zoom;
706 double const zoom_inc = prefs->getDoubleLimited(
707 "/options/zoomincrement/value", M_SQRT2, 1.01, 10);
708 switch (event->scroll.direction) {
709 case GDK_SCROLL_UP:
710 rel_zoom = zoom_inc;
711 break;
712 case GDK_SCROLL_DOWN:
713 rel_zoom = 1 / zoom_inc;
714 break;
715 default:
716 rel_zoom = 0.0;
717 break;
718 }
719 if (rel_zoom != 0.0) {
720 Geom::Point const scroll_dt = desktop->point();
721 desktop->zoom_relative_keep_point(scroll_dt, rel_zoom);
722 }
724 /* no modifier, pan up--down (left--right on multiwheel mice?) */
725 } else {
726 switch (event->scroll.direction) {
727 case GDK_SCROLL_UP:
728 desktop->scroll_world(0, wheel_scroll);
729 break;
730 case GDK_SCROLL_DOWN:
731 desktop->scroll_world(0, -wheel_scroll);
732 break;
733 case GDK_SCROLL_LEFT:
734 desktop->scroll_world(wheel_scroll, 0);
735 break;
736 case GDK_SCROLL_RIGHT:
737 desktop->scroll_world(-wheel_scroll, 0);
738 break;
739 }
740 }
741 break;
742 }
743 default:
744 break;
745 }
747 return ret;
748 }
750 /**
751 * Handles item specific events. Gets called from Gdk.
752 *
753 * Only reacts to right mouse button at the moment.
754 * \todo Fixme: do context sensitive popup menu on items.
755 */
756 gint sp_event_context_private_item_handler(SPEventContext *ec, SPItem *item,
757 GdkEvent *event) {
758 int ret = FALSE;
760 switch (event->type) {
761 case GDK_BUTTON_PRESS:
762 if ((event->button.button == 3) && !(event->button.state
763 & GDK_SHIFT_MASK || event->button.state & GDK_CONTROL_MASK)) {
764 sp_event_root_menu_popup(ec->desktop, item, event);
765 ret = TRUE;
766 }
767 break;
768 default:
769 break;
770 }
772 return ret;
773 }
775 /**
776 * @brief: Returns true if we're hovering above a knot (needed because we don't want to pre-snap in that case)
777 */
779 bool sp_event_context_knot_mouseover(SPEventContext *ec)
780 {
781 if (ec->shape_editor) {
782 return ec->shape_editor->knot_mouseover();
783 }
785 return false;
786 }
788 /**
789 * @brief An observer that relays pref changes to the derived classes
790 */
791 class ToolPrefObserver: public Inkscape::Preferences::Observer {
792 public:
793 ToolPrefObserver(Glib::ustring const &path, SPEventContext *ec) :
794 Inkscape::Preferences::Observer(path), _ec(ec) {
795 }
796 virtual void notify(Inkscape::Preferences::Entry const &val) {
797 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(_ec))->set) {
798 ((SPEventContextClass *) G_OBJECT_GET_CLASS(_ec))->set(_ec,
799 const_cast<Inkscape::Preferences::Entry*> (&val));
800 }
801 }
802 private:
803 SPEventContext * const _ec;
804 };
806 /**
807 * Creates new SPEventContext object and calls its virtual setup() function.
808 * @todo This is bogus. pref_path should be a private property of the inheriting objects.
809 */
810 SPEventContext *
811 sp_event_context_new(GType type, SPDesktop *desktop, gchar const *pref_path,
812 unsigned int key) {
813 g_return_val_if_fail(g_type_is_a(type, SP_TYPE_EVENT_CONTEXT), NULL);
814 g_return_val_if_fail(desktop != NULL, NULL);
816 SPEventContext * const ec = (SPEventContext*) g_object_new(type, NULL);
818 ec->desktop = desktop;
819 ec->_message_context
820 = new Inkscape::MessageContext(desktop->messageStack());
821 ec->key = key;
822 ec->pref_observer = NULL;
824 if (pref_path) {
825 ec->pref_observer = new ToolPrefObserver(pref_path, ec);
827 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
828 prefs->addObserver(*(ec->pref_observer));
829 }
831 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->setup)
832 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->setup(ec);
834 return ec;
835 }
837 /**
838 * Finishes SPEventContext.
839 */
840 void sp_event_context_finish(SPEventContext *ec) {
841 g_return_if_fail(ec != NULL);
842 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
844 ec->enableSelectionCue(false);
846 if (ec->next) {
847 g_warning("Finishing event context with active link\n");
848 }
850 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->finish)
851 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->finish(ec);
852 }
854 //-------------------------------member functions
856 /**
857 * Enables/disables the SPEventContext's SelCue.
858 */
859 void SPEventContext::enableSelectionCue(bool enable) {
860 if (enable) {
861 if (!_selcue) {
862 _selcue = new Inkscape::SelCue(desktop);
863 }
864 } else {
865 delete _selcue;
866 _selcue = NULL;
867 }
868 }
870 /**
871 * Enables/disables the SPEventContext's GrDrag.
872 */
873 void SPEventContext::enableGrDrag(bool enable) {
874 if (enable) {
875 if (!_grdrag) {
876 _grdrag = new GrDrag(desktop);
877 }
878 } else {
879 if (_grdrag) {
880 delete _grdrag;
881 _grdrag = NULL;
882 }
883 }
884 }
886 /**
887 * Calls virtual set() function of SPEventContext.
888 */
889 void sp_event_context_read(SPEventContext *ec, gchar const *key) {
890 g_return_if_fail(ec != NULL);
891 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
892 g_return_if_fail(key != NULL);
894 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->set) {
895 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
896 Inkscape::Preferences::Entry val = prefs->getEntry(
897 ec->pref_observer->observed_path + '/' + key);
898 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->set(ec, &val);
899 }
900 }
902 /**
903 * Calls virtual activate() function of SPEventContext.
904 */
905 void sp_event_context_activate(SPEventContext *ec) {
906 g_return_if_fail(ec != NULL);
907 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
909 // Make sure no delayed snapping events are carried over after switching contexts
910 // (this is only an additional safety measure against sloppy coding, because each
911 // context should take care of this by itself.
912 sp_event_context_discard_delayed_snap_event(ec);
914 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->activate)
915 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->activate(ec);
916 }
918 /**
919 * Calls virtual deactivate() function of SPEventContext.
920 */
921 void sp_event_context_deactivate(SPEventContext *ec) {
922 g_return_if_fail(ec != NULL);
923 g_return_if_fail(SP_IS_EVENT_CONTEXT(ec));
925 if (((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->deactivate)
926 ((SPEventContextClass *) G_OBJECT_GET_CLASS(ec))->deactivate(ec);
927 }
929 /**
930 * Calls virtual root_handler(), the main event handling function.
931 */
932 gint sp_event_context_root_handler(SPEventContext * event_context,
933 GdkEvent * event)
934 {
935 switch (event->type) {
936 case GDK_MOTION_NOTIFY:
937 sp_event_context_snap_delay_handler(event_context, NULL, NULL,
938 (GdkEventMotion *) event,
939 DelayedSnapEvent::EVENTCONTEXT_ROOT_HANDLER);
940 break;
941 case GDK_BUTTON_RELEASE:
942 if (event_context->_delayed_snap_event) {
943 // If we have any pending snapping action, then invoke it now
944 sp_event_context_snap_watchdog_callback(
945 event_context->_delayed_snap_event);
946 }
947 break;
948 case GDK_BUTTON_PRESS:
949 case GDK_2BUTTON_PRESS:
950 case GDK_3BUTTON_PRESS:
951 // Snapping will be on hold if we're moving the mouse at high speeds. When starting
952 // drawing a new shape we really should snap though.
953 event_context->desktop->namedview->snap_manager.snapprefs.setSnapPostponedGlobally(
954 false);
955 break;
956 default:
957 break;
958 }
960 return sp_event_context_virtual_root_handler(event_context, event);
961 }
963 gint sp_event_context_virtual_root_handler(SPEventContext * event_context, GdkEvent * event) {
964 gint ret = false;
965 if (event_context) { // If no event-context is available then do nothing, otherwise Inkscape would crash
966 // (see the comment in SPDesktop::set_event_context, and bug LP #622350)
967 ret = ((SPEventContextClass *) G_OBJECT_GET_CLASS(event_context))->root_handler(event_context, event);
968 set_event_location(event_context->desktop, event);
969 }
970 return ret;
971 }
973 /**
974 * Calls virtual item_handler(), the item event handling function.
975 */
976 gint sp_event_context_item_handler(SPEventContext * event_context,
977 SPItem * item, GdkEvent * event) {
978 switch (event->type) {
979 case GDK_MOTION_NOTIFY:
980 sp_event_context_snap_delay_handler(event_context, (gpointer) item, NULL, (GdkEventMotion *) event, DelayedSnapEvent::EVENTCONTEXT_ITEM_HANDLER);
981 break;
982 case GDK_BUTTON_RELEASE:
983 if (event_context->_delayed_snap_event) {
984 // If we have any pending snapping action, then invoke it now
985 sp_event_context_snap_watchdog_callback(event_context->_delayed_snap_event);
986 }
987 break;
988 case GDK_BUTTON_PRESS:
989 case GDK_2BUTTON_PRESS:
990 case GDK_3BUTTON_PRESS:
991 // Snapping will be on hold if we're moving the mouse at high speeds. When starting
992 // drawing a new shape we really should snap though.
993 event_context->desktop->namedview->snap_manager.snapprefs.setSnapPostponedGlobally(false);
994 break;
995 default:
996 break;
997 }
999 return sp_event_context_virtual_item_handler(event_context, item, event);
1000 }
1002 gint sp_event_context_virtual_item_handler(SPEventContext * event_context, SPItem * item, GdkEvent * event) {
1003 gint ret = false;
1004 if (event_context) { // If no event-context is available then do nothing, otherwise Inkscape would crash
1005 // (see the comment in SPDesktop::set_event_context, and bug LP #622350)
1006 ret = ((SPEventContextClass *) G_OBJECT_GET_CLASS(event_context))->item_handler(event_context, item, event);
1007 if (!ret) {
1008 ret = sp_event_context_virtual_root_handler(event_context, event);
1009 } else {
1010 set_event_location(event_context->desktop, event);
1011 }
1012 }
1014 return ret;
1015 }
1017 /**
1018 * Emits 'position_set' signal on desktop and shows coordinates on status bar.
1019 */
1020 static void set_event_location(SPDesktop *desktop, GdkEvent *event) {
1021 if (event->type != GDK_MOTION_NOTIFY) {
1022 return;
1023 }
1025 Geom::Point const button_w(event->button.x, event->button.y);
1026 Geom::Point const button_dt(desktop->w2d(button_w));
1027 desktop->setPosition(button_dt);
1028 desktop->set_coordinate_status(button_dt);
1029 }
1031 //-------------------------------------------------------------------
1032 /**
1033 * Create popup menu and tell Gtk to show it.
1034 */
1035 void sp_event_root_menu_popup(SPDesktop *desktop, SPItem *item, GdkEvent *event) {
1036 GtkWidget *menu;
1038 /* fixme: This is not what I want but works for now (Lauris) */
1039 if (event->type == GDK_KEY_PRESS) {
1040 item = sp_desktop_selection(desktop)->singleItem();
1041 }
1042 menu = sp_ui_context_menu(desktop, item);
1043 gtk_widget_show(menu);
1045 switch (event->type) {
1046 case GDK_BUTTON_PRESS:
1047 gtk_menu_popup(GTK_MENU(menu), NULL, NULL, 0, NULL,
1048 event->button.button, event->button.time);
1049 break;
1050 case GDK_KEY_PRESS:
1051 gtk_menu_popup(GTK_MENU(menu), NULL, NULL, 0, NULL, 0, event->key.time);
1052 break;
1053 default:
1054 break;
1055 }
1056 }
1058 /**
1059 * Show tool context specific modifier tip.
1060 */
1061 void sp_event_show_modifier_tip(Inkscape::MessageContext *message_context,
1062 GdkEvent *event, gchar const *ctrl_tip, gchar const *shift_tip,
1063 gchar const *alt_tip) {
1064 guint keyval = get_group0_keyval(&event->key);
1066 bool ctrl = ctrl_tip && (MOD__CTRL || (keyval == GDK_Control_L) || (keyval
1067 == GDK_Control_R));
1068 bool shift = shift_tip && (MOD__SHIFT || (keyval == GDK_Shift_L) || (keyval
1069 == GDK_Shift_R));
1070 bool alt = alt_tip && (MOD__ALT || (keyval == GDK_Alt_L) || (keyval
1071 == GDK_Alt_R) || (keyval == GDK_Meta_L) || (keyval == GDK_Meta_R));
1073 gchar *tip = g_strdup_printf("%s%s%s%s%s", (ctrl ? ctrl_tip : ""), (ctrl
1074 && (shift || alt) ? "; " : ""), (shift ? shift_tip : ""), ((ctrl
1075 || shift) && alt ? "; " : ""), (alt ? alt_tip : ""));
1077 if (strlen(tip) > 0) {
1078 message_context->flash(Inkscape::INFORMATION_MESSAGE, tip);
1079 }
1081 g_free(tip);
1082 }
1084 /**
1085 * Return the keyval corresponding to the key event in group 0, i.e.,
1086 * in the main (English) layout.
1087 *
1088 * Use this instead of simply event->keyval, so that your keyboard shortcuts
1089 * work regardless of layouts (e.g., in Cyrillic).
1090 */
1091 guint get_group0_keyval(GdkEventKey *event) {
1092 guint keyval = 0;
1093 gdk_keymap_translate_keyboard_state(gdk_keymap_get_for_display(
1094 gdk_display_get_default()), event->hardware_keycode,
1095 (GdkModifierType) event->state, 0 /*event->key.group*/, &keyval,
1096 NULL, NULL, NULL);
1097 return keyval;
1098 }
1100 /**
1101 * Returns item at point p in desktop.
1102 *
1103 * If state includes alt key mask, cyclically selects under; honors
1104 * into_groups.
1105 */
1106 SPItem *
1107 sp_event_context_find_item(SPDesktop *desktop, Geom::Point const &p,
1108 bool select_under, bool into_groups) {
1109 SPItem *item;
1111 if (select_under) {
1112 SPItem *selected_at_point = desktop->item_from_list_at_point_bottom(
1113 desktop->selection->itemList(), p);
1114 item = desktop->item_at_point(p, into_groups, selected_at_point);
1115 if (item == NULL) { // we may have reached bottom, flip over to the top
1116 item = desktop->item_at_point(p, into_groups, NULL);
1117 }
1118 } else
1119 item = desktop->item_at_point(p, into_groups, NULL);
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->item_from_list_at_point_bottom(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 :