/* Copyright (C) 2011 Paul Davis Author: Carl Hetherington This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /** @file canvas/canvas.cc * @brief Implementation of the main canvas classes. */ #include #include #include #include #include #include "pbd/compose.h" #include "pbd/stacktrace.h" #include "canvas/canvas.h" #include "canvas/debug.h" #include "canvas/line.h" #include "canvas/scroll_group.h" #include "canvas/utils.h" using namespace std; using namespace ArdourCanvas; uint32_t Canvas::tooltip_timeout_msecs = 750; /** Construct a new Canvas */ Canvas::Canvas () : _root (this) , _bg_color (rgba_to_color (0, 1.0, 0.0, 1.0)) { set_epoch (); } void Canvas::scroll_to (Coord x, Coord y) { /* We do things this way because we do not want to recurse through the canvas for every scroll. In the presence of large MIDI tracks this means traversing item lists that include thousands of items (notes). This design limits us to moving only those items (groups, typically) that should move in certain ways as we scroll. In other terms, it becomes O(1) rather than O(N). */ for (list::iterator i = scrollers.begin(); i != scrollers.end(); ++i) { (*i)->scroll_to (Duple (x, y)); } pick_current_item (0); // no current mouse position } void Canvas::add_scroller (ScrollGroup& i) { scrollers.push_back (&i); } void Canvas::zoomed () { pick_current_item (0); // no current mouse position } /** Render an area of the canvas. * @param area Area in window coordinates. * @param context Cairo context to render to. */ void Canvas::render (Rect const & area, Cairo::RefPtr const & context) const { #ifdef CANVAS_DEBUG if (DEBUG_ENABLED(PBD::DEBUG::CanvasRender)) { cerr << this << " RENDER: " << area << endl; //cerr << "CANVAS @ " << this << endl; //dump (cerr); //cerr << "-------------------------\n"; } #endif render_count = 0; boost::optional root_bbox = _root.bounding_box(); if (!root_bbox) { /* the root has no bounding box, so there's nothing to render */ return; } boost::optional draw = root_bbox->intersection (area); if (draw) { /* there's a common area between the root and the requested area, so render it. */ _root.render (*draw, context); #if defined CANVAS_DEBUG && !PLATFORM_WINDOWS if (getenv ("CANVAS_HARLEQUIN_DEBUGGING")) { // This transparently colors the rect being rendered, after it has been drawn. double r = (random() % 65536) /65536.0; double g = (random() % 65536) /65536.0; double b = (random() % 65536) /65536.0; context->rectangle (draw->x0, draw->y0, draw->x1 - draw->x0, draw->y1 - draw->y0); context->set_source_rgba (r, g, b, 0.25); context->fill (); } #endif } } ostream& operator<< (ostream& o, Canvas& c) { c.dump (o); return o; } std::string Canvas::indent() const { string s; for (int n = 0; n < ArdourCanvas::dump_depth; ++n) { s += '\t'; } return s; } std::string Canvas::render_indent() const { string s; for (int n = 0; n < ArdourCanvas::render_depth; ++n) { s += ' '; } return s; } void Canvas::dump (ostream& o) const { dump_depth = 0; _root.dump (o); } /** Called when an item has been shown or hidden. * @param item Item that has been shown or hidden. */ void Canvas::item_shown_or_hidden (Item* item) { boost::optional bbox = item->bounding_box (); if (bbox) { if (item->item_to_window (*bbox).intersection (visible_area ())) { queue_draw_item_area (item, bbox.get ()); } } } /** Called when an item has a change to its visual properties * that do NOT affect its bounding box. * @param item Item that has been modified. */ void Canvas::item_visual_property_changed (Item* item) { boost::optional bbox = item->bounding_box (); if (bbox) { if (item->item_to_window (*bbox).intersection (visible_area ())) { queue_draw_item_area (item, bbox.get ()); } } } /** Called when an item has changed, but not moved. * @param item Item that has changed. * @param pre_change_bounding_box The bounding box of item before the change, * in the item's coordinates. */ void Canvas::item_changed (Item* item, boost::optional pre_change_bounding_box) { Rect window_bbox = visible_area (); if (pre_change_bounding_box) { if (item->item_to_window (*pre_change_bounding_box).intersection (window_bbox)) { /* request a redraw of the item's old bounding box */ queue_draw_item_area (item, pre_change_bounding_box.get ()); } } boost::optional post_change_bounding_box = item->bounding_box (); if (post_change_bounding_box) { if (item->item_to_window (*post_change_bounding_box).intersection (window_bbox)) { /* request a redraw of the item's new bounding box */ queue_draw_item_area (item, post_change_bounding_box.get ()); } } } Duple Canvas::window_to_canvas (Duple const & d) const { /* Find the scroll group that covers d (a window coordinate). Scroll groups are only allowed * as children of the root group, so we just scan its first level * children and see what we can find. */ std::list const& root_children (_root.items()); ScrollGroup* sg = 0; /* if the coordinates are negative, clamp to zero and find the item * that covers that "edge" position. */ Duple in_window (d); if (in_window.x < 0) { in_window.x = 0; } if (in_window.y < 0) { in_window.y = 0; } for (std::list::const_iterator i = root_children.begin(); i != root_children.end(); ++i) { if (((sg = dynamic_cast(*i)) != 0) && sg->covers_window (in_window)) { break; } } if (sg) { return d.translate (sg->scroll_offset()); } return d; } Duple Canvas::canvas_to_window (Duple const & d, bool rounded) const { /* Find the scroll group that covers d (a canvas coordinate). Scroll groups are only allowed * as children of the root group, so we just scan its first level * children and see what we can find. */ std::list const& root_children (_root.items()); ScrollGroup* sg = 0; Duple wd; for (std::list::const_iterator i = root_children.begin(); i != root_children.end(); ++i) { if (((sg = dynamic_cast(*i)) != 0) && sg->covers_canvas (d)) { break; } } if (sg) { wd = d.translate (-sg->scroll_offset()); } else { wd = d; } /* Note that this intentionally almost always returns integer coordinates */ if (rounded) { wd.x = round (wd.x); wd.y = round (wd.y); } return wd; } /** Called when an item has moved. * @param item Item that has moved. * @param pre_change_parent_bounding_box The bounding box of the item before * the move, in its parent's coordinates. */ void Canvas::item_moved (Item* item, boost::optional pre_change_parent_bounding_box) { if (pre_change_parent_bounding_box) { /* request a redraw of where the item used to be. The box has * to be in parent coordinate space since the bounding box of * an item does not change when moved. If we use * item->item_to_canvas() on the old bounding box, we will be * using the item's new position, and so will compute the wrong * invalidation area. If we use the parent (which has not * moved, then this will work. */ queue_draw_item_area (item->parent(), pre_change_parent_bounding_box.get ()); } boost::optional post_change_bounding_box = item->bounding_box (); if (post_change_bounding_box) { /* request a redraw of where the item now is */ queue_draw_item_area (item, post_change_bounding_box.get ()); } } /** Request a redraw of a particular area in an item's coordinates. * @param item Item. * @param area Area to redraw in the item's coordinates. */ void Canvas::queue_draw_item_area (Item* item, Rect area) { request_redraw (item->item_to_window (area)); } void Canvas::set_tooltip_timeout (uint32_t msecs) { tooltip_timeout_msecs = msecs; } void Canvas::set_background_color (Color c) { _bg_color = c; boost::optional r = _root.bounding_box(); if (r) { request_redraw (_root.item_to_window (r.get())); } } void GtkCanvas::re_enter () { DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, "re-enter canvas by request\n"); _current_item = 0; pick_current_item (0); } /** Construct a GtkCanvas */ GtkCanvas::GtkCanvas () : _current_item (0) , _new_current_item (0) , _grabbed_item (0) , _focused_item (0) , current_tooltip_item (0) , tooltip_window (0) { /* these are the events we want to know about */ add_events (Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK | Gdk::POINTER_MOTION_MASK | Gdk::SCROLL_MASK | Gdk::ENTER_NOTIFY_MASK | Gdk::LEAVE_NOTIFY_MASK); } void GtkCanvas::pick_current_item (int state) { int x; int y; /* this version of ::pick_current_item() is called after an item is * added or removed, so we have no coordinates to work from as is the * case with a motion event. Find out where the mouse is and use that. */ Glib::RefPtr pointer_window = Gdk::Display::get_default()->get_window_at_pointer (x, y); if (pointer_window != get_window()) { return; } pick_current_item (Duple (x, y), state); } /** Given @param point (a position in window coordinates) * and mouse state @param state, check to see if _current_item * (which will be used to deliver events) should change. */ void GtkCanvas::pick_current_item (Duple const & point, int state) { /* we do not enter/leave items during a drag/grab */ if (_grabbed_item) { return; } /* find the items at the given window position */ vector items; _root.add_items_at_point (point, items); DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("%1 covers %2 items\n", point, items.size())); #ifndef NDEBUG if (DEBUG_ENABLED(PBD::DEBUG::CanvasEnterLeave)) { for (vector::const_iterator it = items.begin(); it != items.end(); ++it) { #ifdef CANVAS_DEBUG std::cerr << "\tItem " << (*it)->whatami() << '/' << (*it)->name << " ignore events ? " << (*it)->ignore_events() << " vis ? " << (*it)->visible() << std::endl; #else std::cerr << "\tItem " << (*it)->whatami() << '/' << " ignore events ? " << (*it)->ignore_events() << " vis ? " << (*it)->visible() << std::endl; #endif } } #endif /* put all items at point that are event-sensitive and visible and NOT groups into within_items. Note that items is sorted from bottom to top, but we're going to reverse that for within_items so that its first item is the upper-most item that can be chosen as _current_item. */ vector::const_iterator i; list within_items; for (i = items.begin(); i != items.end(); ++i) { Item const * possible_item = *i; /* We ignore invisible items, containers and items that ignore events */ if (!possible_item->visible() || possible_item->ignore_events() || dynamic_cast(possible_item) != 0) { continue; } within_items.push_front (possible_item); } DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("after filtering insensitive + containers, we have %1 items\n", within_items.size())); if (within_items.empty()) { /* no items at point, just send leave event below */ _new_current_item = 0; } else { if (within_items.front() == _current_item) { /* uppermost item at point is already _current_item */ DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("CURRENT ITEM %1/%2\n", _new_current_item->whatami(), _current_item->name)); return; } _new_current_item = const_cast (within_items.front()); } if (_new_current_item != _current_item) { deliver_enter_leave (point, state); } if (_current_item) { DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("CURRENT ITEM %1/%2\n", _new_current_item->whatami(), _current_item->name)); } else { DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, "--- no current item\n"); } } /** Deliver a series of enter & leave events based on the pointer position being at window * coordinate @param point, and pointer @param state (modifier keys, etc) */ void GtkCanvas::deliver_enter_leave (Duple const & point, int state) { /* setup enter & leave event structures */ Glib::RefPtr win = get_window(); if (!win) { return; } GdkEventCrossing enter_event; enter_event.type = GDK_ENTER_NOTIFY; enter_event.window = win->gobj(); enter_event.send_event = 0; enter_event.subwindow = 0; enter_event.mode = GDK_CROSSING_NORMAL; enter_event.focus = FALSE; enter_event.state = state; /* Events delivered to canvas items are expected to be in canvas * coordinates but @param point is in window coordinates. */ Duple c = window_to_canvas (point); enter_event.x = c.x; enter_event.y = c.y; GdkEventCrossing leave_event = enter_event; leave_event.type = GDK_LEAVE_NOTIFY; Item* i; GdkNotifyType enter_detail; GdkNotifyType leave_detail; vector items_to_leave_virtual; vector items_to_enter_virtual; if (_new_current_item == 0) { leave_detail = GDK_NOTIFY_UNKNOWN; if (_current_item) { /* no current item, so also send virtual leave events to the * entire heirarchy for the current item */ for (i = _current_item->parent(); i ; i = i->parent()) { items_to_leave_virtual.push_back (i); } } } else if (_current_item == 0) { enter_detail = GDK_NOTIFY_UNKNOWN; /* no current item, so also send virtual enter events to the * entire heirarchy for the new item */ for (i = _new_current_item->parent(); i ; i = i->parent()) { items_to_enter_virtual.push_back (i); } } else if (_current_item->is_descendant_of (*_new_current_item)) { /* move from descendant to ancestor (X: "_current_item is an * inferior ("child") of _new_current_item") * * Deliver "virtual" leave notifications to all items in the * heirarchy between current and new_current. */ for (i = _current_item->parent(); i && i != _new_current_item; i = i->parent()) { items_to_leave_virtual.push_back (i); } enter_detail = GDK_NOTIFY_INFERIOR; leave_detail = GDK_NOTIFY_ANCESTOR; } else if (_new_current_item->is_descendant_of (*_current_item)) { /* move from ancestor to descendant (X: "_new_current_item is * an inferior ("child") of _current_item") * * Deliver "virtual" enter notifications to all items in the * heirarchy between current and new_current. */ for (i = _new_current_item->parent(); i && i != _current_item; i = i->parent()) { items_to_enter_virtual.push_back (i); } enter_detail = GDK_NOTIFY_ANCESTOR; leave_detail = GDK_NOTIFY_INFERIOR; } else { Item const * common_ancestor = _current_item->closest_ancestor_with (*_new_current_item); /* deliver virtual leave events to everything between _current * and common_ancestor. */ for (i = _current_item->parent(); i && i != common_ancestor; i = i->parent()) { items_to_leave_virtual.push_back (i); } /* deliver virtual enter events to everything between * _new_current and common_ancestor. */ for (i = _new_current_item->parent(); i && i != common_ancestor; i = i->parent()) { items_to_enter_virtual.push_back (i); } enter_detail = GDK_NOTIFY_NONLINEAR; leave_detail = GDK_NOTIFY_NONLINEAR; } if (_current_item && !_current_item->ignore_events ()) { leave_event.detail = leave_detail; _current_item->Event ((GdkEvent*)&leave_event); DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("LEAVE %1/%2\n", _current_item->whatami(), _current_item->name)); } leave_event.detail = GDK_NOTIFY_VIRTUAL; enter_event.detail = GDK_NOTIFY_VIRTUAL; for (vector::iterator it = items_to_leave_virtual.begin(); it != items_to_leave_virtual.end(); ++it) { if (!(*it)->ignore_events()) { DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("leave %1/%2\n", (*it)->whatami(), (*it)->name)); (*it)->Event ((GdkEvent*)&leave_event); } } for (vector::iterator it = items_to_enter_virtual.begin(); it != items_to_enter_virtual.end(); ++it) { if (!(*it)->ignore_events()) { DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("enter %1/%2\n", (*it)->whatami(), (*it)->name)); (*it)->Event ((GdkEvent*)&enter_event); // std::cerr << "enter " << (*it)->whatami() << '/' << (*it)->name << std::endl; } } if (_new_current_item && !_new_current_item->ignore_events()) { enter_event.detail = enter_detail; DEBUG_TRACE (PBD::DEBUG::CanvasEnterLeave, string_compose ("ENTER %1/%2\n", _new_current_item->whatami(), _new_current_item->name)); start_tooltip_timeout (_new_current_item); _new_current_item->Event ((GdkEvent*)&enter_event); } _current_item = _new_current_item; } /** Deliver an event to the appropriate item; either the grabbed item, or * one of the items underneath the event. * @param point Position that the event has occurred at, in canvas coordinates. * @param event The event. */ bool GtkCanvas::deliver_event (GdkEvent* event) { /* Point in in canvas coordinate space */ const Item* event_item; if (_grabbed_item) { /* we have a grabbed item, so everything gets sent there */ DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("%1 %2 (%3) was grabbed, send event there\n", _grabbed_item, _grabbed_item->whatami(), _grabbed_item->name)); event_item = _grabbed_item; } else { event_item = _current_item; } if (!event_item) { return false; } /* run through the items from child to parent, until one claims the event */ Item* item = const_cast (event_item); while (item) { Item* parent = item->parent (); if (!item->ignore_events () && item->Event (event)) { /* this item has just handled the event */ DEBUG_TRACE ( PBD::DEBUG::CanvasEvents, string_compose ("canvas event handled by %1 %2\n", item->whatami(), item->name.empty() ? "[unknown]" : item->name) ); return true; } 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))); if ((item = parent) == 0) { break; } } return false; } /** Called when an item is being destroyed. * @param item Item being destroyed. * @param bounding_box Last known bounding box of the item. */ void GtkCanvas::item_going_away (Item* item, boost::optional bounding_box) { if (bounding_box) { queue_draw_item_area (item, bounding_box.get ()); } if (_new_current_item == item) { _new_current_item = 0; } if (_grabbed_item == item) { _grabbed_item = 0; } if (_focused_item == item) { _focused_item = 0; } if (current_tooltip_item) { current_tooltip_item = 0; stop_tooltip_timeout (); } ScrollGroup* sg = dynamic_cast(item); if (sg) { scrollers.remove (sg); } if (_current_item == item) { /* no need to send a leave event to this item, since it is going away */ _current_item = 0; pick_current_item (0); // no mouse state } } void GtkCanvas::on_size_allocate (Gtk::Allocation& a) { EventBox::on_size_allocate (a); #ifdef USE_CAIRO_IMAGE_SURFACE /* allocate an image surface as large as the canvas itself */ canvas_image.clear (); canvas_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, a.get_width(), a.get_height()); #endif } /** Handler for GDK expose events. * @param ev Event. * @return true if the event was handled. */ bool GtkCanvas::on_expose_event (GdkEventExpose* ev) { #ifdef USE_CAIRO_IMAGE_SURFACE if (!canvas_image) { canvas_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, get_width(), get_height()); } Cairo::RefPtr draw_context = Cairo::Context::create (canvas_image); Cairo::RefPtr window_context = get_window()->create_cairo_context (); #else Cairo::RefPtr draw_context = get_window()->create_cairo_context (); #endif /* draw background color */ draw_context->save (); draw_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height); draw_context->clip (); draw_context->set_operator (Cairo::OPERATOR_SOURCE); set_source_rgba (draw_context, _bg_color); draw_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height); draw_context->fill (); draw_context->restore (); /* render canvas */ render (Rect (ev->area.x, ev->area.y, ev->area.x + ev->area.width, ev->area.y + ev->area.height), draw_context); #ifdef USE_CAIRO_IMAGE_SURFACE_FOR_GTK_CANVAS /* now blit our private surface back to the GDK one */ window_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height); window_context->clip (); window_context->set_source (canvas_image, 0, 0); window_context->set_operator (Cairo::OPERATOR_SOURCE); window_context->paint (); #endif return true; } /** Handler for GDK scroll events. * @param ev Event. * @return true if the event was handled. */ bool GtkCanvas::on_scroll_event (GdkEventScroll* ev) { /* translate event coordinates from window to canvas */ GdkEvent copy = *((GdkEvent*)ev); Duple winpos = Duple (ev->x, ev->y); Duple where = window_to_canvas (winpos); pick_current_item (winpos, ev->state); copy.button.x = where.x; copy.button.y = where.y; /* Coordinates in the event will be canvas coordinates, correctly adjusted for scroll if this GtkCanvas is in a GtkCanvasViewport. */ DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas scroll @ %1, %2 => %3\n", ev->x, ev->y, where)); return deliver_event (reinterpret_cast(©)); } /** Handler for GDK button press events. * @param ev Event. * @return true if the event was handled. */ bool GtkCanvas::on_button_press_event (GdkEventButton* ev) { /* translate event coordinates from window to canvas */ GdkEvent copy = *((GdkEvent*)ev); Duple winpos = Duple (ev->x, ev->y); Duple where = window_to_canvas (winpos); pick_current_item (winpos, ev->state); copy.button.x = where.x; copy.button.y = where.y; /* Coordinates in the event will be canvas coordinates, correctly adjusted for scroll if this GtkCanvas is in a GtkCanvasViewport. */ DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas button press @ %1, %2 => %3\n", ev->x, ev->y, where)); return deliver_event (reinterpret_cast(©)); } /** Handler for GDK button release events. * @param ev Event. * @return true if the event was handled. */ bool GtkCanvas::on_button_release_event (GdkEventButton* ev) { /* translate event coordinates from window to canvas */ GdkEvent copy = *((GdkEvent*)ev); Duple winpos = Duple (ev->x, ev->y); Duple where = window_to_canvas (winpos); pick_current_item (winpos, ev->state); copy.button.x = where.x; copy.button.y = where.y; /* Coordinates in the event will be canvas coordinates, correctly adjusted for scroll if this GtkCanvas is in a GtkCanvasViewport. */ DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas button release @ %1, %2 => %3\n", ev->x, ev->y, where)); return deliver_event (reinterpret_cast(©)); } bool GtkCanvas::get_mouse_position (Duple& winpos) const { int x; int y; Gdk::ModifierType mask; Glib::RefPtr self = Glib::RefPtr::cast_const (get_window ()); if (!self) { std::cerr << " no self window\n"; winpos = Duple (0, 0); return false; } Glib::RefPtr win = self->get_pointer (x, y, mask); winpos.x = x; winpos.y = y; return true; } /** Handler for GDK motion events. * @param ev Event. * @return true if the event was handled. */ bool GtkCanvas::on_motion_notify_event (GdkEventMotion* ev) { hide_tooltip (); /* translate event coordinates from window to canvas */ GdkEvent copy = *((GdkEvent*)ev); Duple point (ev->x, ev->y); Duple where = window_to_canvas (point); copy.motion.x = where.x; copy.motion.y = where.y; /* Coordinates in "copy" will be canvas coordinates, */ 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)); MouseMotion (point); /* EMIT SIGNAL */ pick_current_item (point, ev->state); /* Now deliver the motion event. It may seem a little inefficient to recompute the items under the event, but the enter notify/leave events may have deleted canvas items so it is important to recompute the list in deliver_event. */ return deliver_event (reinterpret_cast (©)); } bool GtkCanvas::on_enter_notify_event (GdkEventCrossing* ev) { pick_current_item (Duple (ev->x, ev->y), ev->state); return true; } bool GtkCanvas::on_leave_notify_event (GdkEventCrossing* ev) { switch (ev->detail) { case GDK_NOTIFY_ANCESTOR: case GDK_NOTIFY_UNKNOWN: case GDK_NOTIFY_VIRTUAL: case GDK_NOTIFY_NONLINEAR: case GDK_NOTIFY_NONLINEAR_VIRTUAL: /* leaving window, cancel any tooltips */ stop_tooltip_timeout (); hide_tooltip (); break; default: /* we don't care about any other kind of leave event (notably GDK_NOTIFY_INFERIOR) */ break; } _new_current_item = 0; deliver_enter_leave (Duple (ev->x, ev->y), ev->state); return true; } /** Called to request a redraw of our canvas. * @param area Area to redraw, in window coordinates. */ void GtkCanvas::request_redraw (Rect const & request) { Rect real_area; Coord const w = width (); Coord const h = height (); /* clamp area requested to actual visible window */ real_area.x0 = max (0.0, min (w, request.x0)); real_area.x1 = max (0.0, min (w, request.x1)); real_area.y0 = max (0.0, min (h, request.y0)); real_area.y1 = max (0.0, min (h, request.y1)); queue_draw_area (real_area.x0, real_area.y0, real_area.width(), real_area.height()); } /** Called to request that we try to get a particular size for ourselves. * @param size Size to request, in pixels. */ void GtkCanvas::request_size (Duple size) { Duple req = size; if (req.x > INT_MAX) { req.x = INT_MAX; } if (req.y > INT_MAX) { req.y = INT_MAX; } set_size_request (req.x, req.y); } /** `Grab' an item, so that all events are sent to that item until it is `ungrabbed'. * This is typically used for dragging items around, so that they are grabbed during * the drag. * @param item Item to grab. */ void GtkCanvas::grab (Item* item) { /* XXX: should this be doing gdk_pointer_grab? */ _grabbed_item = item; } /** `Ungrab' any item that was previously grabbed */ void GtkCanvas::ungrab () { /* XXX: should this be doing gdk_pointer_ungrab? */ _grabbed_item = 0; } /** Set keyboard focus on an item, so that all keyboard events are sent to that item until the focus * moves elsewhere. * @param item Item to grab. */ void GtkCanvas::focus (Item* item) { _focused_item = item; } void GtkCanvas::unfocus (Item* item) { if (item == _focused_item) { _focused_item = 0; } } /** @return The visible area of the canvas, in window coordinates */ Rect GtkCanvas::visible_area () const { return Rect (0, 0, get_allocation().get_width (), get_allocation().get_height ()); } Coord GtkCanvas::width() const { return get_allocation().get_width(); } Coord GtkCanvas::height() const { return get_allocation().get_height(); } void GtkCanvas::start_tooltip_timeout (Item* item) { stop_tooltip_timeout (); if (item) { current_tooltip_item = item; /* wait for the first idle that happens after this is called. this means that we've stopped processing events, which in turn implies that the user has stopped doing stuff for a little while. */ Glib::signal_idle().connect (sigc::mem_fun (*this, &GtkCanvas::really_start_tooltip_timeout)); } } bool GtkCanvas::really_start_tooltip_timeout () { /* an idle has occured since we entered a tooltip-bearing widget. Now * wait 1 second and if the timeout isn't cancelled, show the tooltip. */ if (current_tooltip_item) { tooltip_timeout_connection = Glib::signal_timeout().connect (sigc::mem_fun (*this, &GtkCanvas::show_tooltip), tooltip_timeout_msecs); } return false; /* this is called from an idle callback, don't call it again */ } void GtkCanvas::stop_tooltip_timeout () { current_tooltip_item = 0; tooltip_timeout_connection.disconnect (); } bool GtkCanvas::show_tooltip () { Rect tooltip_item_bbox; if (!current_tooltip_item || current_tooltip_item->tooltip().empty() || !current_tooltip_item->bounding_box()) { return false; } if (!tooltip_window) { tooltip_window = new Gtk::Window (Gtk::WINDOW_POPUP); tooltip_label = manage (new Gtk::Label); tooltip_label->show (); tooltip_window->add (*tooltip_label); tooltip_window->set_border_width (6); tooltip_window->set_name ("tooltip"); } tooltip_label->set_text (current_tooltip_item->tooltip()); /* figure out where to position the tooltip */ Gtk::Widget* toplevel = get_toplevel(); assert (toplevel); int pointer_x, pointer_y; Gdk::ModifierType mask; (void) toplevel->get_window()->get_pointer (pointer_x, pointer_y, mask); Duple tooltip_window_origin (pointer_x, pointer_y); /* convert to root window coordinates */ int win_x, win_y; dynamic_cast(toplevel)->get_position (win_x, win_y); tooltip_window_origin = tooltip_window_origin.translate (Duple (win_x, win_y)); /* we don't want the pointer to be inside the window when it is * displayed, because then we generate a leave/enter event pair when * the window is displayed then hidden - the enter event will * trigger a new tooltip timeout. * * So move the window right of the pointer position by just a enough * to get it away from the pointer. */ tooltip_window_origin.x += 20; /* move the tooltip window into position */ tooltip_window->move (tooltip_window_origin.x, tooltip_window_origin.y); /* ready to show */ tooltip_window->present (); /* called from a timeout handler, don't call it again */ return false; } void GtkCanvas::hide_tooltip () { /* hide it if its there */ if (tooltip_window) { tooltip_window->hide (); } } /** Create a GtkCanvaSViewport. * @param hadj Adjustment to use for horizontal scrolling. * @param vadj Adjustment to use for vertica scrolling. */ GtkCanvasViewport::GtkCanvasViewport (Gtk::Adjustment& hadj, Gtk::Adjustment& vadj) : Alignment (0, 0, 1.0, 1.0) , hadjustment (hadj) , vadjustment (vadj) { add (_canvas); hadj.signal_value_changed().connect (sigc::mem_fun (*this, &GtkCanvasViewport::scrolled)); vadj.signal_value_changed().connect (sigc::mem_fun (*this, &GtkCanvasViewport::scrolled)); } void GtkCanvasViewport::scrolled () { _canvas.scroll_to (hadjustment.get_value(), vadjustment.get_value()); queue_draw (); } /** Handler for when GTK asks us what minimum size we want. * @param req Requsition to fill in. */ void GtkCanvasViewport::on_size_request (Gtk::Requisition* req) { /* force the canvas to size itself */ // _canvas.root()->bounding_box(); req->width = 16; req->height = 16; }