2 Copyright (C) 2011 Paul Davis
3 Author: Carl Hetherington <cth@carlh.net>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 /** @file canvas/canvas.cc
22 * @brief Implementation of the main canvas classes.
27 #include <gtkmm/adjustment.h>
28 #include <gtkmm/label.h>
29 #include <gtkmm/window.h>
31 #include "pbd/compose.h"
32 #include "pbd/stacktrace.h"
34 #include "canvas/canvas.h"
35 #include "canvas/colors.h"
36 #include "canvas/debug.h"
37 #include "canvas/line.h"
38 #include "canvas/scroll_group.h"
39 #include "canvas/utils.h"
42 using namespace ArdourCanvas;
44 uint32_t Canvas::tooltip_timeout_msecs = 750;
46 /** Construct a new Canvas */
49 , _bg_color (rgba_to_color (0, 1.0, 0.0, 1.0))
55 Canvas::scroll_to (Coord x, Coord y)
57 /* We do things this way because we do not want to recurse through
58 the canvas for every scroll. In the presence of large MIDI
59 tracks this means traversing item lists that include
60 thousands of items (notes).
62 This design limits us to moving only those items (groups, typically)
63 that should move in certain ways as we scroll. In other terms, it
64 becomes O(1) rather than O(N).
67 for (list<ScrollGroup*>::iterator i = scrollers.begin(); i != scrollers.end(); ++i) {
68 (*i)->scroll_to (Duple (x, y));
71 pick_current_item (0); // no current mouse position
75 Canvas::add_scroller (ScrollGroup& i)
77 scrollers.push_back (&i);
83 pick_current_item (0); // no current mouse position
86 /** Render an area of the canvas.
87 * @param area Area in window coordinates.
88 * @param context Cairo context to render to.
91 Canvas::render (Rect const & area, Cairo::RefPtr<Cairo::Context> const & context) const
94 if (DEBUG_ENABLED(PBD::DEBUG::CanvasRender)) {
95 cerr << this << " RENDER: " << area << endl;
96 //cerr << "CANVAS @ " << this << endl;
98 //cerr << "-------------------------\n";
104 boost::optional<Rect> root_bbox = _root.bounding_box();
106 /* the root has no bounding box, so there's nothing to render */
110 boost::optional<Rect> draw = root_bbox->intersection (area);
113 /* there's a common area between the root and the requested
117 _root.render (*draw, context);
119 #if defined CANVAS_DEBUG && !PLATFORM_WINDOWS
120 if (getenv ("CANVAS_HARLEQUIN_DEBUGGING")) {
121 // This transparently colors the rect being rendered, after it has been drawn.
122 double r = (random() % 65536) /65536.0;
123 double g = (random() % 65536) /65536.0;
124 double b = (random() % 65536) /65536.0;
125 context->rectangle (draw->x0, draw->y0, draw->x1 - draw->x0, draw->y1 - draw->y0);
126 context->set_source_rgba (r, g, b, 0.25);
135 operator<< (ostream& o, Canvas& c)
142 Canvas::indent() const
146 for (int n = 0; n < ArdourCanvas::dump_depth; ++n) {
154 Canvas::render_indent() const
158 for (int n = 0; n < ArdourCanvas::render_depth; ++n) {
166 Canvas::dump (ostream& o) const
172 /** Called when an item has been shown or hidden.
173 * @param item Item that has been shown or hidden.
176 Canvas::item_shown_or_hidden (Item* item)
178 boost::optional<Rect> bbox = item->bounding_box ();
180 if (item->item_to_window (*bbox).intersection (visible_area ())) {
181 queue_draw_item_area (item, bbox.get ());
186 /** Called when an item has a change to its visual properties
187 * that do NOT affect its bounding box.
188 * @param item Item that has been modified.
191 Canvas::item_visual_property_changed (Item* item)
193 boost::optional<Rect> bbox = item->bounding_box ();
195 if (item->item_to_window (*bbox).intersection (visible_area ())) {
196 queue_draw_item_area (item, bbox.get ());
201 /** Called when an item has changed, but not moved.
202 * @param item Item that has changed.
203 * @param pre_change_bounding_box The bounding box of item before the change,
204 * in the item's coordinates.
207 Canvas::item_changed (Item* item, boost::optional<Rect> pre_change_bounding_box)
210 Rect window_bbox = visible_area ();
212 if (pre_change_bounding_box) {
214 if (item->item_to_window (*pre_change_bounding_box).intersection (window_bbox)) {
215 /* request a redraw of the item's old bounding box */
216 queue_draw_item_area (item, pre_change_bounding_box.get ());
220 boost::optional<Rect> post_change_bounding_box = item->bounding_box ();
221 if (post_change_bounding_box) {
223 if (item->item_to_window (*post_change_bounding_box).intersection (window_bbox)) {
224 /* request a redraw of the item's new bounding box */
225 queue_draw_item_area (item, post_change_bounding_box.get ());
231 Canvas::window_to_canvas (Duple const & d) const
233 /* Find the scroll group that covers d (a window coordinate). Scroll groups are only allowed
234 * as children of the root group, so we just scan its first level
235 * children and see what we can find.
238 std::list<Item*> const& root_children (_root.items());
241 /* if the coordinates are negative, clamp to zero and find the item
242 * that covers that "edge" position.
247 if (in_window.x < 0) {
250 if (in_window.y < 0) {
254 for (std::list<Item*>::const_iterator i = root_children.begin(); i != root_children.end(); ++i) {
255 if (((sg = dynamic_cast<ScrollGroup*>(*i)) != 0) && sg->covers_window (in_window)) {
261 return d.translate (sg->scroll_offset());
268 Canvas::canvas_to_window (Duple const & d, bool rounded) const
270 /* Find the scroll group that covers d (a canvas coordinate). Scroll groups are only allowed
271 * as children of the root group, so we just scan its first level
272 * children and see what we can find.
275 std::list<Item*> const& root_children (_root.items());
279 for (std::list<Item*>::const_iterator i = root_children.begin(); i != root_children.end(); ++i) {
280 if (((sg = dynamic_cast<ScrollGroup*>(*i)) != 0) && sg->covers_canvas (d)) {
287 wd = d.translate (-sg->scroll_offset());
292 /* Note that this intentionally almost always returns integer coordinates */
302 /** Called when an item has moved.
303 * @param item Item that has moved.
304 * @param pre_change_parent_bounding_box The bounding box of the item before
305 * the move, in its parent's coordinates.
308 Canvas::item_moved (Item* item, boost::optional<Rect> pre_change_parent_bounding_box)
310 if (pre_change_parent_bounding_box) {
311 /* request a redraw of where the item used to be. The box has
312 * to be in parent coordinate space since the bounding box of
313 * an item does not change when moved. If we use
314 * item->item_to_canvas() on the old bounding box, we will be
316 * using the item's new position, and so will compute the wrong
317 * invalidation area. If we use the parent (which has not
318 * moved, then this will work.
320 queue_draw_item_area (item->parent(), pre_change_parent_bounding_box.get ());
323 boost::optional<Rect> post_change_bounding_box = item->bounding_box ();
324 if (post_change_bounding_box) {
325 /* request a redraw of where the item now is */
326 queue_draw_item_area (item, post_change_bounding_box.get ());
330 /** Request a redraw of a particular area in an item's coordinates.
332 * @param area Area to redraw in the item's coordinates.
335 Canvas::queue_draw_item_area (Item* item, Rect area)
337 request_redraw (item->item_to_window (area));
341 Canvas::set_tooltip_timeout (uint32_t msecs)
343 tooltip_timeout_msecs = msecs;
347 Canvas::set_background_color (Color c)
351 boost::optional<Rect> r = _root.bounding_box();
354 request_redraw (_root.item_to_window (r.get()));
359 GtkCanvas::re_enter ()
361 DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, "re-enter canvas by request\n");
363 pick_current_item (0);
366 /** Construct a GtkCanvas */
367 GtkCanvas::GtkCanvas ()
369 , _new_current_item (0)
372 , current_tooltip_item (0)
375 /* these are the events we want to know about */
376 add_events (Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK | Gdk::POINTER_MOTION_MASK |
377 Gdk::SCROLL_MASK | Gdk::ENTER_NOTIFY_MASK | Gdk::LEAVE_NOTIFY_MASK);
381 GtkCanvas::pick_current_item (int state)
386 /* this version of ::pick_current_item() is called after an item is
387 * added or removed, so we have no coordinates to work from as is the
388 * case with a motion event. Find out where the mouse is and use that.
391 Glib::RefPtr<const Gdk::Window> pointer_window = Gdk::Display::get_default()->get_window_at_pointer (x, y);
393 if (pointer_window != get_window()) {
397 pick_current_item (Duple (x, y), state);
400 /** Given @param point (a position in window coordinates)
401 * and mouse state @param state, check to see if _current_item
402 * (which will be used to deliver events) should change.
405 GtkCanvas::pick_current_item (Duple const & point, int state)
407 /* we do not enter/leave items during a drag/grab */
413 /* find the items at the given window position */
415 vector<Item const *> items;
416 _root.add_items_at_point (point, items);
418 DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("%1 covers %2 items\n", point, items.size()));
421 if (DEBUG_ENABLED(PBD::DEBUG::CanvasEnterLeave)) {
422 for (vector<Item const*>::const_iterator it = items.begin(); it != items.end(); ++it) {
424 std::cerr << "\tItem " << (*it)->whatami() << '/' << (*it)->name << " ignore events ? " << (*it)->ignore_events() << " vis ? " << (*it)->visible() << std::endl;
426 std::cerr << "\tItem " << (*it)->whatami() << '/' << " ignore events ? " << (*it)->ignore_events() << " vis ? " << (*it)->visible() << std::endl;
432 /* put all items at point that are event-sensitive and visible and NOT
433 groups into within_items. Note that items is sorted from bottom to
434 top, but we're going to reverse that for within_items so that its
435 first item is the upper-most item that can be chosen as _current_item.
438 vector<Item const *>::const_iterator i;
439 list<Item const *> within_items;
441 for (i = items.begin(); i != items.end(); ++i) {
443 Item const * possible_item = *i;
445 /* We ignore invisible items, containers and items that ignore events */
447 if (!possible_item->visible() || possible_item->ignore_events() || dynamic_cast<ArdourCanvas::Container const *>(possible_item) != 0) {
450 within_items.push_front (possible_item);
453 DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("after filtering insensitive + containers, we have %1 items\n", within_items.size()));
455 if (within_items.empty()) {
457 /* no items at point, just send leave event below */
458 _new_current_item = 0;
462 if (within_items.front() == _current_item) {
463 /* uppermost item at point is already _current_item */
464 DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("CURRENT ITEM %1/%2\n", _new_current_item->whatami(), _current_item->name));
468 _new_current_item = const_cast<Item*> (within_items.front());
471 if (_new_current_item != _current_item) {
472 deliver_enter_leave (point, state);
476 DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("CURRENT ITEM %1/%2\n", _new_current_item->whatami(), _current_item->name));
478 DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, "--- no current item\n");
483 /** Deliver a series of enter & leave events based on the pointer position being at window
484 * coordinate @param point, and pointer @param state (modifier keys, etc)
487 GtkCanvas::deliver_enter_leave (Duple const & point, int state)
489 /* setup enter & leave event structures */
491 Glib::RefPtr<Gdk::Window> win = get_window();
497 GdkEventCrossing enter_event;
498 enter_event.type = GDK_ENTER_NOTIFY;
499 enter_event.window = win->gobj();
500 enter_event.send_event = 0;
501 enter_event.subwindow = 0;
502 enter_event.mode = GDK_CROSSING_NORMAL;
503 enter_event.focus = FALSE;
504 enter_event.state = state;
506 /* Events delivered to canvas items are expected to be in canvas
507 * coordinates but @param point is in window coordinates.
510 Duple c = window_to_canvas (point);
514 GdkEventCrossing leave_event = enter_event;
515 leave_event.type = GDK_LEAVE_NOTIFY;
518 GdkNotifyType enter_detail;
519 GdkNotifyType leave_detail;
520 vector<Item*> items_to_leave_virtual;
521 vector<Item*> items_to_enter_virtual;
523 if (_new_current_item == 0) {
525 leave_detail = GDK_NOTIFY_UNKNOWN;
529 /* no current item, so also send virtual leave events to the
530 * entire heirarchy for the current item
533 for (i = _current_item->parent(); i ; i = i->parent()) {
534 items_to_leave_virtual.push_back (i);
538 } else if (_current_item == 0) {
540 enter_detail = GDK_NOTIFY_UNKNOWN;
542 /* no current item, so also send virtual enter events to the
543 * entire heirarchy for the new item
546 for (i = _new_current_item->parent(); i ; i = i->parent()) {
547 items_to_enter_virtual.push_back (i);
550 } else if (_current_item->is_descendant_of (*_new_current_item)) {
552 /* move from descendant to ancestor (X: "_current_item is an
553 * inferior ("child") of _new_current_item")
555 * Deliver "virtual" leave notifications to all items in the
556 * heirarchy between current and new_current.
559 for (i = _current_item->parent(); i && i != _new_current_item; i = i->parent()) {
560 items_to_leave_virtual.push_back (i);
563 enter_detail = GDK_NOTIFY_INFERIOR;
564 leave_detail = GDK_NOTIFY_ANCESTOR;
566 } else if (_new_current_item->is_descendant_of (*_current_item)) {
567 /* move from ancestor to descendant (X: "_new_current_item is
568 * an inferior ("child") of _current_item")
570 * Deliver "virtual" enter notifications to all items in the
571 * heirarchy between current and new_current.
574 for (i = _new_current_item->parent(); i && i != _current_item; i = i->parent()) {
575 items_to_enter_virtual.push_back (i);
578 enter_detail = GDK_NOTIFY_ANCESTOR;
579 leave_detail = GDK_NOTIFY_INFERIOR;
583 Item const * common_ancestor = _current_item->closest_ancestor_with (*_new_current_item);
585 /* deliver virtual leave events to everything between _current
586 * and common_ancestor.
589 for (i = _current_item->parent(); i && i != common_ancestor; i = i->parent()) {
590 items_to_leave_virtual.push_back (i);
593 /* deliver virtual enter events to everything between
594 * _new_current and common_ancestor.
597 for (i = _new_current_item->parent(); i && i != common_ancestor; i = i->parent()) {
598 items_to_enter_virtual.push_back (i);
601 enter_detail = GDK_NOTIFY_NONLINEAR;
602 leave_detail = GDK_NOTIFY_NONLINEAR;
606 if (_current_item && !_current_item->ignore_events ()) {
607 leave_event.detail = leave_detail;
608 _current_item->Event ((GdkEvent*)&leave_event);
609 DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("LEAVE %1/%2\n", _current_item->whatami(), _current_item->name));
612 leave_event.detail = GDK_NOTIFY_VIRTUAL;
613 enter_event.detail = GDK_NOTIFY_VIRTUAL;
615 for (vector<Item*>::iterator it = items_to_leave_virtual.begin(); it != items_to_leave_virtual.end(); ++it) {
616 if (!(*it)->ignore_events()) {
617 DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("leave %1/%2\n", (*it)->whatami(), (*it)->name));
618 (*it)->Event ((GdkEvent*)&leave_event);
622 for (vector<Item*>::iterator it = items_to_enter_virtual.begin(); it != items_to_enter_virtual.end(); ++it) {
623 if (!(*it)->ignore_events()) {
624 DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("enter %1/%2\n", (*it)->whatami(), (*it)->name));
625 (*it)->Event ((GdkEvent*)&enter_event);
626 // std::cerr << "enter " << (*it)->whatami() << '/' << (*it)->name << std::endl;
630 if (_new_current_item && !_new_current_item->ignore_events()) {
631 enter_event.detail = enter_detail;
632 DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("ENTER %1/%2\n", _new_current_item->whatami(), _new_current_item->name));
633 start_tooltip_timeout (_new_current_item);
634 _new_current_item->Event ((GdkEvent*)&enter_event);
637 _current_item = _new_current_item;
641 /** Deliver an event to the appropriate item; either the grabbed item, or
642 * one of the items underneath the event.
643 * @param point Position that the event has occurred at, in canvas coordinates.
644 * @param event The event.
647 GtkCanvas::deliver_event (GdkEvent* event)
649 /* Point in in canvas coordinate space */
651 const Item* event_item;
654 /* we have a grabbed item, so everything gets sent there */
655 DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("%1 %2 (%3) was grabbed, send event there\n",
656 _grabbed_item, _grabbed_item->whatami(), _grabbed_item->name));
657 event_item = _grabbed_item;
659 event_item = _current_item;
666 /* run through the items from child to parent, until one claims the event */
668 Item* item = const_cast<Item*> (event_item);
672 Item* parent = item->parent ();
674 if (!item->ignore_events () &&
675 item->Event (event)) {
676 /* this item has just handled the event */
678 PBD::DEBUG::CanvasEvents,
679 string_compose ("canvas event handled by %1 %2\n", item->whatami(), item->name.empty() ? "[unknown]" : item->name)
685 DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas event %3 left unhandled by %1 %2\n", item->whatami(), item->name.empty() ? "[unknown]" : item->name, event_type_string (event->type)));
687 if ((item = parent) == 0) {
696 /** Called when an item is being destroyed.
697 * @param item Item being destroyed.
698 * @param bounding_box Last known bounding box of the item.
701 GtkCanvas::item_going_away (Item* item, boost::optional<Rect> bounding_box)
704 queue_draw_item_area (item, bounding_box.get ());
707 if (_new_current_item == item) {
708 _new_current_item = 0;
711 if (_grabbed_item == item) {
715 if (_focused_item == item) {
719 if (current_tooltip_item) {
720 current_tooltip_item = 0;
721 stop_tooltip_timeout ();
724 ScrollGroup* sg = dynamic_cast<ScrollGroup*>(item);
726 scrollers.remove (sg);
729 if (_current_item == item) {
730 /* no need to send a leave event to this item, since it is going away
733 pick_current_item (0); // no mouse state
739 GtkCanvas::on_size_allocate (Gtk::Allocation& a)
741 EventBox::on_size_allocate (a);
742 #ifdef USE_CAIRO_IMAGE_SURFACE
743 /* allocate an image surface as large as the canvas itself */
745 canvas_image.clear ();
746 canvas_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, a.get_width(), a.get_height());
750 /** Handler for GDK expose events.
752 * @return true if the event was handled.
755 GtkCanvas::on_expose_event (GdkEventExpose* ev)
757 #ifdef USE_CAIRO_IMAGE_SURFACE
759 canvas_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, get_width(), get_height());
761 Cairo::RefPtr<Cairo::Context> draw_context = Cairo::Context::create (canvas_image);
762 Cairo::RefPtr<Cairo::Context> window_context = get_window()->create_cairo_context ();
764 Cairo::RefPtr<Cairo::Context> draw_context = get_window()->create_cairo_context ();
767 /* draw background color */
769 draw_context->save ();
770 draw_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
771 draw_context->clip ();
772 draw_context->set_operator (Cairo::OPERATOR_SOURCE);
773 set_source_rgba (draw_context, _bg_color);
774 draw_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
775 draw_context->fill ();
776 draw_context->restore ();
780 render (Rect (ev->area.x, ev->area.y, ev->area.x + ev->area.width, ev->area.y + ev->area.height), draw_context);
782 #ifdef USE_CAIRO_IMAGE_SURFACE_FOR_GTK_CANVAS
783 /* now blit our private surface back to the GDK one */
785 window_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
786 window_context->clip ();
787 window_context->set_source (canvas_image, 0, 0);
788 window_context->set_operator (Cairo::OPERATOR_SOURCE);
789 window_context->paint ();
795 /** Handler for GDK scroll events.
797 * @return true if the event was handled.
800 GtkCanvas::on_scroll_event (GdkEventScroll* ev)
802 /* translate event coordinates from window to canvas */
804 GdkEvent copy = *((GdkEvent*)ev);
805 Duple winpos = Duple (ev->x, ev->y);
806 Duple where = window_to_canvas (winpos);
808 pick_current_item (winpos, ev->state);
810 copy.button.x = where.x;
811 copy.button.y = where.y;
813 /* Coordinates in the event will be canvas coordinates, correctly adjusted
814 for scroll if this GtkCanvas is in a GtkCanvasViewport.
817 DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas scroll @ %1, %2 => %3\n", ev->x, ev->y, where));
818 return deliver_event (reinterpret_cast<GdkEvent*>(©));
821 /** Handler for GDK button press events.
823 * @return true if the event was handled.
826 GtkCanvas::on_button_press_event (GdkEventButton* ev)
828 /* translate event coordinates from window to canvas */
830 GdkEvent copy = *((GdkEvent*)ev);
831 Duple winpos = Duple (ev->x, ev->y);
832 Duple where = window_to_canvas (winpos);
834 pick_current_item (winpos, ev->state);
836 copy.button.x = where.x;
837 copy.button.y = where.y;
839 /* Coordinates in the event will be canvas coordinates, correctly adjusted
840 for scroll if this GtkCanvas is in a GtkCanvasViewport.
843 DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas button press @ %1, %2 => %3\n", ev->x, ev->y, where));
844 return deliver_event (reinterpret_cast<GdkEvent*>(©));
847 /** Handler for GDK button release events.
849 * @return true if the event was handled.
852 GtkCanvas::on_button_release_event (GdkEventButton* ev)
854 /* translate event coordinates from window to canvas */
856 GdkEvent copy = *((GdkEvent*)ev);
857 Duple winpos = Duple (ev->x, ev->y);
858 Duple where = window_to_canvas (winpos);
860 pick_current_item (winpos, ev->state);
862 copy.button.x = where.x;
863 copy.button.y = where.y;
865 /* Coordinates in the event will be canvas coordinates, correctly adjusted
866 for scroll if this GtkCanvas is in a GtkCanvasViewport.
869 DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas button release @ %1, %2 => %3\n", ev->x, ev->y, where));
870 return deliver_event (reinterpret_cast<GdkEvent*>(©));
874 GtkCanvas::get_mouse_position (Duple& winpos) const
878 Gdk::ModifierType mask;
879 Glib::RefPtr<Gdk::Window> self = Glib::RefPtr<Gdk::Window>::cast_const (get_window ());
882 std::cerr << " no self window\n";
883 winpos = Duple (0, 0);
887 Glib::RefPtr<Gdk::Window> win = self->get_pointer (x, y, mask);
895 /** Handler for GDK motion events.
897 * @return true if the event was handled.
900 GtkCanvas::on_motion_notify_event (GdkEventMotion* ev)
904 /* translate event coordinates from window to canvas */
906 GdkEvent copy = *((GdkEvent*)ev);
907 Duple point (ev->x, ev->y);
908 Duple where = window_to_canvas (point);
910 copy.motion.x = where.x;
911 copy.motion.y = where.y;
913 /* Coordinates in "copy" will be canvas coordinates,
916 DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas motion @ %1, %2 canvas @ %3, %4\n", ev->x, ev->y, copy.motion.x, copy.motion.y));
918 MouseMotion (point); /* EMIT SIGNAL */
920 pick_current_item (point, ev->state);
922 /* Now deliver the motion event. It may seem a little inefficient
923 to recompute the items under the event, but the enter notify/leave
924 events may have deleted canvas items so it is important to
925 recompute the list in deliver_event.
928 return deliver_event (reinterpret_cast<GdkEvent*> (©));
932 GtkCanvas::on_enter_notify_event (GdkEventCrossing* ev)
934 pick_current_item (Duple (ev->x, ev->y), ev->state);
939 GtkCanvas::on_leave_notify_event (GdkEventCrossing* ev)
941 switch (ev->detail) {
942 case GDK_NOTIFY_ANCESTOR:
943 case GDK_NOTIFY_UNKNOWN:
944 case GDK_NOTIFY_VIRTUAL:
945 case GDK_NOTIFY_NONLINEAR:
946 case GDK_NOTIFY_NONLINEAR_VIRTUAL:
947 /* leaving window, cancel any tooltips */
948 stop_tooltip_timeout ();
952 /* we don't care about any other kind
953 of leave event (notably GDK_NOTIFY_INFERIOR)
957 _new_current_item = 0;
958 deliver_enter_leave (Duple (ev->x, ev->y), ev->state);
962 /** Called to request a redraw of our canvas.
963 * @param area Area to redraw, in window coordinates.
966 GtkCanvas::request_redraw (Rect const & request)
970 Coord const w = width ();
971 Coord const h = height ();
973 /* clamp area requested to actual visible window */
975 real_area.x0 = max (0.0, min (w, request.x0));
976 real_area.x1 = max (0.0, min (w, request.x1));
977 real_area.y0 = max (0.0, min (h, request.y0));
978 real_area.y1 = max (0.0, min (h, request.y1));
980 queue_draw_area (real_area.x0, real_area.y0, real_area.width(), real_area.height());
983 /** Called to request that we try to get a particular size for ourselves.
984 * @param size Size to request, in pixels.
987 GtkCanvas::request_size (Duple size)
991 if (req.x > INT_MAX) {
995 if (req.y > INT_MAX) {
999 set_size_request (req.x, req.y);
1002 /** `Grab' an item, so that all events are sent to that item until it is `ungrabbed'.
1003 * This is typically used for dragging items around, so that they are grabbed during
1005 * @param item Item to grab.
1008 GtkCanvas::grab (Item* item)
1010 /* XXX: should this be doing gdk_pointer_grab? */
1011 _grabbed_item = item;
1015 /** `Ungrab' any item that was previously grabbed */
1017 GtkCanvas::ungrab ()
1019 /* XXX: should this be doing gdk_pointer_ungrab? */
1023 /** Set keyboard focus on an item, so that all keyboard events are sent to that item until the focus
1025 * @param item Item to grab.
1028 GtkCanvas::focus (Item* item)
1030 _focused_item = item;
1034 GtkCanvas::unfocus (Item* item)
1036 if (item == _focused_item) {
1041 /** @return The visible area of the canvas, in window coordinates */
1043 GtkCanvas::visible_area () const
1045 return Rect (0, 0, get_allocation().get_width (), get_allocation().get_height ());
1049 GtkCanvas::width() const
1051 return get_allocation().get_width();
1055 GtkCanvas::height() const
1057 return get_allocation().get_height();
1061 GtkCanvas::start_tooltip_timeout (Item* item)
1063 stop_tooltip_timeout ();
1066 current_tooltip_item = item;
1068 /* wait for the first idle that happens after this is
1069 called. this means that we've stopped processing events, which
1070 in turn implies that the user has stopped doing stuff for a
1074 Glib::signal_idle().connect (sigc::mem_fun (*this, &GtkCanvas::really_start_tooltip_timeout));
1079 GtkCanvas::really_start_tooltip_timeout ()
1081 /* an idle has occured since we entered a tooltip-bearing widget. Now
1082 * wait 1 second and if the timeout isn't cancelled, show the tooltip.
1085 if (current_tooltip_item) {
1086 tooltip_timeout_connection = Glib::signal_timeout().connect (sigc::mem_fun (*this, &GtkCanvas::show_tooltip), tooltip_timeout_msecs);
1089 return false; /* this is called from an idle callback, don't call it again */
1093 GtkCanvas::stop_tooltip_timeout ()
1095 current_tooltip_item = 0;
1096 tooltip_timeout_connection.disconnect ();
1100 GtkCanvas::show_tooltip ()
1102 Rect tooltip_item_bbox;
1104 if (!current_tooltip_item || current_tooltip_item->tooltip().empty() || !current_tooltip_item->bounding_box()) {
1108 if (!tooltip_window) {
1109 tooltip_window = new Gtk::Window (Gtk::WINDOW_POPUP);
1110 tooltip_label = manage (new Gtk::Label);
1111 tooltip_label->show ();
1112 tooltip_window->add (*tooltip_label);
1113 tooltip_window->set_border_width (6);
1114 tooltip_window->set_name ("tooltip");
1117 tooltip_label->set_text (current_tooltip_item->tooltip());
1119 /* figure out where to position the tooltip */
1121 Gtk::Widget* toplevel = get_toplevel();
1123 int pointer_x, pointer_y;
1124 Gdk::ModifierType mask;
1126 (void) toplevel->get_window()->get_pointer (pointer_x, pointer_y, mask);
1128 Duple tooltip_window_origin (pointer_x, pointer_y);
1130 /* convert to root window coordinates */
1133 dynamic_cast<Gtk::Window*>(toplevel)->get_position (win_x, win_y);
1135 tooltip_window_origin = tooltip_window_origin.translate (Duple (win_x, win_y));
1137 /* we don't want the pointer to be inside the window when it is
1138 * displayed, because then we generate a leave/enter event pair when
1139 * the window is displayed then hidden - the enter event will
1140 * trigger a new tooltip timeout.
1142 * So move the window right of the pointer position by just a enough
1143 * to get it away from the pointer.
1146 tooltip_window_origin.x += 20;
1148 /* move the tooltip window into position */
1150 tooltip_window->move (tooltip_window_origin.x, tooltip_window_origin.y);
1154 tooltip_window->present ();
1156 /* called from a timeout handler, don't call it again */
1162 GtkCanvas::hide_tooltip ()
1164 /* hide it if its there */
1166 if (tooltip_window) {
1167 tooltip_window->hide ();
1171 /** Create a GtkCanvaSViewport.
1172 * @param hadj Adjustment to use for horizontal scrolling.
1173 * @param vadj Adjustment to use for vertica scrolling.
1175 GtkCanvasViewport::GtkCanvasViewport (Gtk::Adjustment& hadj, Gtk::Adjustment& vadj)
1176 : Alignment (0, 0, 1.0, 1.0)
1177 , hadjustment (hadj)
1178 , vadjustment (vadj)
1182 hadj.signal_value_changed().connect (sigc::mem_fun (*this, &GtkCanvasViewport::scrolled));
1183 vadj.signal_value_changed().connect (sigc::mem_fun (*this, &GtkCanvasViewport::scrolled));
1187 GtkCanvasViewport::scrolled ()
1189 _canvas.scroll_to (hadjustment.get_value(), vadjustment.get_value());
1193 /** Handler for when GTK asks us what minimum size we want.
1194 * @param req Requsition to fill in.
1197 GtkCanvasViewport::on_size_request (Gtk::Requisition* req)
1199 /* force the canvas to size itself */
1200 // _canvas.root()->bounding_box();