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.
26 #include <gtkmm/adjustment.h>
27 #include <gtkmm/label.h>
29 #include "pbd/compose.h"
30 #include "pbd/stacktrace.h"
32 #include "canvas/canvas.h"
33 #include "canvas/debug.h"
36 using namespace ArdourCanvas;
38 /** Construct a new Canvas */
42 , _scroll_offset_x (0)
43 , _scroll_offset_y (0)
49 Canvas::scroll_to (Coord x, Coord y)
55 /** Render an area of the canvas.
56 * @param area Area in canvas coordinates.
57 * @param context Cairo context to render to.
60 Canvas::render (Rect const & area, Cairo::RefPtr<Cairo::Context> const & context) const
63 if (DEBUG_ENABLED(PBD::DEBUG::CanvasRender)) {
64 cerr << "CANVAS @ " << this << endl;
66 cerr << "-------------------------\n";
70 // checkpoint ("render", "-> render");
76 if (getenv ("ARDOUR_REDRAW_CANVAS")) {
77 /* light up the canvas to show redraws */
78 context->set_source_rgba (random()%255 / 255.0,
82 context->rectangle (area.x0, area.y0, area.width(), area.height());
87 /* clip to the requested area */
88 context->rectangle (area.x0, area.y0, area.width(), area.height());
91 boost::optional<Rect> root_bbox = _root.bounding_box();
93 /* the root has no bounding box, so there's nothing to render */
94 // checkpoint ("render", "no root bbox");
99 boost::optional<Rect> draw = root_bbox.get().intersection (area);
101 /* there's a common area between the root and the requested
104 // checkpoint ("render", "... root");
107 _root.render (*draw, context);
111 _renders.push_back (area);
117 if (getenv ("ARDOUR_HARLEQUIN_CANVAS")) {
118 /* light up the canvas to show redraws */
119 context->set_source_rgba (random()%255 / 255.0,
120 random()%255 / 255.0,
121 random()%255 / 255.0,
123 context->rectangle (area.x0, area.y0, area.width(), area.height());
127 // checkpoint ("render", "<- render");
131 operator<< (ostream& o, Canvas& c)
138 Canvas::indent() const
142 for (int n = 0; n < ArdourCanvas::dump_depth; ++n) {
150 Canvas::render_indent() const
154 for (int n = 0; n < ArdourCanvas::render_depth; ++n) {
162 Canvas::dump (ostream& o) const
168 /** Called when an item has been shown or hidden.
169 * @param item Item that has been shown or hidden.
172 Canvas::item_shown_or_hidden (Item* item)
174 boost::optional<Rect> bbox = item->bounding_box ();
176 queue_draw_item_area (item, bbox.get ());
180 /** Called when an item has a change to its visual properties
181 * that do NOT affect its bounding box.
182 * @param item Item that has been modified.
185 Canvas::item_visual_property_changed (Item* item)
187 boost::optional<Rect> bbox = item->bounding_box ();
189 queue_draw_item_area (item, bbox.get ());
193 /** Called when an item has changed, but not moved.
194 * @param item Item that has changed.
195 * @param pre_change_bounding_box The bounding box of item before the change,
196 * in the item's coordinates.
199 Canvas::item_changed (Item* item, boost::optional<Rect> pre_change_bounding_box)
201 if (pre_change_bounding_box) {
202 /* request a redraw of the item's old bounding box */
203 queue_draw_item_area (item, pre_change_bounding_box.get ());
206 boost::optional<Rect> post_change_bounding_box = item->bounding_box ();
207 if (post_change_bounding_box) {
208 /* request a redraw of the item's new bounding box */
209 queue_draw_item_area (item, post_change_bounding_box.get ());
214 Canvas::window_to_canvas (Duple const & d) const
216 return d.translate (Duple (_scroll_offset_x, _scroll_offset_y));
220 Canvas::canvas_to_window (Duple const & d) const
222 return d.translate (Duple (-_scroll_offset_x, -_scroll_offset_y));
226 Canvas::window_to_canvas (Rect const & r) const
228 return r.translate (Duple (_scroll_offset_x, _scroll_offset_y));
232 Canvas::canvas_to_window (Rect const & r) const
234 return r.translate (Duple (-_scroll_offset_x, -_scroll_offset_y));
237 /** Called when an item has moved.
238 * @param item Item that has moved.
239 * @param pre_change_parent_bounding_box The bounding box of the item before
240 * the move, in its parent's coordinates.
243 Canvas::item_moved (Item* item, boost::optional<Rect> pre_change_parent_bounding_box)
245 if (pre_change_parent_bounding_box) {
246 /* request a redraw of where the item used to be. The box has
247 * to be in parent coordinate space since the bounding box of
248 * an item does not change when moved. If we use
249 * item->item_to_canvas() on the old bounding box, we will be
250 * using the item's new position, and so will compute the wrong
251 * invalidation area. If we use the parent (which has not
252 * moved, then this will work.
255 queue_draw_item_area (item->parent(), pre_change_parent_bounding_box.get ());
258 boost::optional<Rect> post_change_bounding_box = item->bounding_box ();
259 if (post_change_bounding_box) {
260 /* request a redraw of where the item now is */
261 queue_draw_item_area (item, post_change_bounding_box.get ());
265 /** Request a redraw of a particular area in an item's coordinates.
267 * @param area Area to redraw in the item's coordinates.
270 Canvas::queue_draw_item_area (Item* item, Rect area)
272 ArdourCanvas::Rect canvas_area = item->item_to_canvas (area);
273 // cerr << "CANVAS Invalidate " << area << " TRANSLATE AS " << canvas_area << endl;
274 request_redraw (canvas_area);
277 /** Construct a GtkCanvas */
278 GtkCanvas::GtkCanvas ()
282 /* these are the events we want to know about */
283 add_events (Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK | Gdk::POINTER_MOTION_MASK);
286 /** Handler for button presses on the canvas.
287 * @param ev GDK event.
290 GtkCanvas::button_handler (GdkEventButton* ev)
292 DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas button %3 %1 %1\n", ev->x, ev->y, (ev->type == GDK_BUTTON_PRESS ? "press" : "release")));
293 /* The Duple that we are passing in here is in canvas coordinates */
294 return deliver_event (Duple (ev->x, ev->y), reinterpret_cast<GdkEvent*> (ev));
297 /** Handler for pointer motion events on the canvas.
298 * @param ev GDK event.
299 * @return true if the motion event was handled, otherwise false.
302 GtkCanvas::motion_notify_handler (GdkEventMotion* ev)
305 /* if we have a grabbed item, it gets just the motion event,
306 since no enter/leave events can have happened.
308 DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("%1 %2 (%3) was grabbed, send MOTION event there\n",
309 _grabbed_item, _grabbed_item->whatami(), _grabbed_item->name));
310 return _grabbed_item->Event (reinterpret_cast<GdkEvent*> (ev));
313 /* This is in canvas coordinates */
314 Duple point (ev->x, ev->y);
316 /* find the items at the new mouse position */
317 vector<Item const *> items;
318 _root.add_items_at_point (point, items);
320 Item const * new_item = items.empty() ? 0 : items.back ();
322 if (_current_item && _current_item != new_item) {
324 GdkEventCrossing leave_event;
325 leave_event.type = GDK_LEAVE_NOTIFY;
326 leave_event.x = ev->x;
327 leave_event.y = ev->y;
328 _current_item->Event (reinterpret_cast<GdkEvent*> (&leave_event));
331 if (new_item && _current_item != new_item) {
333 GdkEventCrossing enter_event;
334 enter_event.type = GDK_ENTER_NOTIFY;
335 enter_event.x = ev->x;
336 enter_event.y = ev->y;
337 new_item->Event (reinterpret_cast<GdkEvent*> (&enter_event));
340 _current_item = new_item;
342 /* Now deliver the motion event. It may seem a little inefficient
343 to recompute the items under the event, but the enter notify/leave
344 events may have deleted canvas items so it is important to
345 recompute the list in deliver_event.
347 return deliver_event (point, reinterpret_cast<GdkEvent*> (ev));
350 /** Deliver an event to the appropriate item; either the grabbed item, or
351 * one of the items underneath the event.
352 * @param point Position that the event has occurred at, in canvas coordinates.
353 * @param event The event.
356 GtkCanvas::deliver_event (Duple point, GdkEvent* event)
359 /* we have a grabbed item, so everything gets sent there */
360 DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("%1 %2 (%3) was grabbed, send event there\n",
361 _grabbed_item, _grabbed_item->whatami(), _grabbed_item->name));
362 return _grabbed_item->Event (event);
365 /* find the items that exist at the event's position */
366 vector<Item const *> items;
367 _root.add_items_at_point (point, items);
369 DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("%1 possible items to deliver event to\n", items.size()));
371 /* run through the items under the event, from top to bottom, until one claims the event */
372 vector<Item const *>::const_reverse_iterator i = items.rbegin ();
373 while (i != items.rend()) {
375 if ((*i)->ignore_events ()) {
377 PBD::DEBUG::CanvasEvents,
378 string_compose ("canvas event ignored by %1 %2\n", (*i)->whatami(), (*i)->name.empty() ? "[unknown]" : (*i)->name)
384 if ((*i)->Event (event)) {
385 /* this item has just handled the event */
387 PBD::DEBUG::CanvasEvents,
388 string_compose ("canvas event handled by %1 %2\n", (*i)->whatami(), (*i)->name.empty() ? "[unknown]" : (*i)->name)
395 PBD::DEBUG::CanvasEvents,
396 string_compose ("canvas event left unhandled by %1 %2\n", (*i)->whatami(), (*i)->name.empty() ? "[unknown]" : (*i)->name)
403 if (PBD::debug_bits & PBD::DEBUG::CanvasEvents) {
404 while (i != items.rend()) {
405 DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas event not seen by %1\n", (*i)->name.empty() ? "[unknown]" : (*i)->name));
413 /** Called when an item is being destroyed.
414 * @param item Item being destroyed.
415 * @param bounding_box Last known bounding box of the item.
418 GtkCanvas::item_going_away (Item* item, boost::optional<Rect> bounding_box)
421 queue_draw_item_area (item, bounding_box.get ());
424 if (_current_item == item) {
428 if (_grabbed_item == item) {
433 /** Handler for GDK expose events.
435 * @return true if the event was handled.
438 GtkCanvas::on_expose_event (GdkEventExpose* ev)
441 Cairo::RefPtr<Cairo::Context> c = get_window()->create_cairo_context ();
444 * 0,0 _scroll_offset_x, _scroll_offset_y
447 /* render using canvas coordinates */
449 Rect canvas_area (ev->area.x, ev->area.y, ev->area.x + ev->area.width, ev->area.y + ev->area.height);
450 canvas_area = canvas_area.translate (Duple (_scroll_offset_x, _scroll_offset_y));
452 /* things are going to render to the cairo surface with canvas
455 * an item at window/cairo 0,0 will have canvas_coords _scroll_offset_x,_scroll_offset_y
457 * let them render at their natural coordinates by using cairo_translate()
460 c->translate (-_scroll_offset_x, -_scroll_offset_y);
462 render (canvas_area, c);
467 /** @return Our Cairo context, or 0 if we don't have one */
468 Cairo::RefPtr<Cairo::Context>
469 GtkCanvas::context ()
471 Glib::RefPtr<Gdk::Window> w = get_window ();
473 return Cairo::RefPtr<Cairo::Context> ();
476 return w->create_cairo_context ();
479 /** Handler for GDK button press events.
481 * @return true if the event was handled.
484 GtkCanvas::on_button_press_event (GdkEventButton* ev)
486 /* translate event coordinates from window to canvas */
488 GdkEvent copy = *((GdkEvent*)ev);
489 Duple where = window_to_canvas (Duple (ev->x, ev->y));
491 copy.button.x = where.x;
492 copy.button.y = where.y;
494 /* Coordinates in the event will be canvas coordinates, correctly adjusted
495 for scroll if this GtkCanvas is in a GtkCanvasViewport.
497 return button_handler ((GdkEventButton*) ©);
500 /** Handler for GDK button release events.
502 * @return true if the event was handled.
505 GtkCanvas::on_button_release_event (GdkEventButton* ev)
507 /* translate event coordinates from window to canvas */
509 GdkEvent copy = *((GdkEvent*)ev);
510 Duple where = window_to_canvas (Duple (ev->x, ev->y));
512 copy.button.x = where.x;
513 copy.button.y = where.y;
515 /* Coordinates in the event will be canvas coordinates, correctly adjusted
516 for scroll if this GtkCanvas is in a GtkCanvasViewport.
518 return button_handler ((GdkEventButton*) ©);
521 /** Handler for GDK motion events.
523 * @return true if the event was handled.
526 GtkCanvas::on_motion_notify_event (GdkEventMotion* ev)
528 /* translate event coordinates from window to canvas */
530 GdkEvent copy = *((GdkEvent*)ev);
531 Duple where = window_to_canvas (Duple (ev->x, ev->y));
533 copy.motion.x = where.x;
534 copy.motion.y = where.y;
536 /* Coordinates in the event will be canvas coordinates, correctly adjusted
537 for scroll if this GtkCanvas is in a GtkCanvasViewport.
539 return motion_notify_handler ((GdkEventMotion*) ©);
542 /** Called to request a redraw of our canvas.
543 * @param area Area to redraw, in canvas coordinates.
546 GtkCanvas::request_redraw (Rect const & request)
548 Rect area = canvas_to_window (request);
549 // cerr << "Invalidate " << request << " TRANSLATE AS " << area << endl;
550 queue_draw_area (floor (area.x0), floor (area.y0), ceil (area.x1) - floor (area.x0), ceil (area.y1) - floor (area.y0));
553 /** Called to request that we try to get a particular size for ourselves.
554 * @param size Size to request, in pixels.
557 GtkCanvas::request_size (Duple size)
561 if (req.x > INT_MAX) {
565 if (req.y > INT_MAX) {
569 set_size_request (req.x, req.y);
572 /** `Grab' an item, so that all events are sent to that item until it is `ungrabbed'.
573 * This is typically used for dragging items around, so that they are grabbed during
575 * @param item Item to grab.
578 GtkCanvas::grab (Item* item)
580 /* XXX: should this be doing gdk_pointer_grab? */
581 _grabbed_item = item;
584 /** `Ungrab' any item that was previously grabbed */
588 /* XXX: should this be doing gdk_pointer_ungrab? */
592 /** @return The visible area of the canvas, in canvas coordinates */
594 GtkCanvas::visible_area () const
596 Distance const xo = _scroll_offset_x;
597 Distance const yo = _scroll_offset_y;
598 return Rect (xo, yo, xo + get_allocation().get_width (), yo + get_allocation().get_height ());
601 /** Create a GtkCanvaSViewport.
602 * @param hadj Adjustment to use for horizontal scrolling.
603 * @param vadj Adjustment to use for vertica scrolling.
605 GtkCanvasViewport::GtkCanvasViewport (Gtk::Adjustment& hadj, Gtk::Adjustment& vadj)
606 : Alignment (0, 0, 1.0, 1.0)
612 hadj.signal_value_changed().connect (sigc::mem_fun (*this, &GtkCanvasViewport::scrolled));
613 vadj.signal_value_changed().connect (sigc::mem_fun (*this, &GtkCanvasViewport::scrolled));
617 GtkCanvasViewport::scrolled ()
619 _canvas.scroll_to (hadjustment.get_value(), vadjustment.get_value());
623 /** Handler for when GTK asks us what minimum size we want.
624 * @param req Requsition to fill in.
627 GtkCanvasViewport::on_size_request (Gtk::Requisition* req)
629 /* force the canvas to size itself */
630 // _canvas.root()->bounding_box();