--- /dev/null
-
- // context->rectangle (area.x0, area.y0, area.x1 - area.x0, area.y1 - area.y0);
- // context->set_source_rgba (1.0, 0, 0, 1.0);
- // context->fill ();
-
+/*
+ Copyright (C) 2011 Paul Davis
+ Author: Carl Hetherington <cth@carlh.net>
+
+ 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 <list>
+#include <cassert>
+#include <gtkmm/adjustment.h>
+#include <gtkmm/label.h>
+
+#include "pbd/compose.h"
+#include "pbd/stacktrace.h"
+
+#include "canvas/canvas.h"
+#include "canvas/debug.h"
+
+using namespace std;
+using namespace ArdourCanvas;
+
+/** Construct a new Canvas */
+Canvas::Canvas ()
+ : _root (this)
+ , _scroll_offset_x (0)
+ , _scroll_offset_y (0)
+{
+ set_epoch ();
+}
+
+void
+Canvas::scroll_to (Coord x, Coord y)
+{
+ _scroll_offset_x = x;
+ _scroll_offset_y = y;
+
+ pick_current_item (0); // no current mouse position
+}
+
+void
+Canvas::zoomed ()
+{
+ pick_current_item (0); // no current mouse position
+}
+
+/** Render an area of the canvas.
+ * @param area Area in canvas coordinates.
+ * @param context Cairo context to render to.
+ */
+void
+Canvas::render (Rect const & area, Cairo::RefPtr<Cairo::Context> const & context) const
+{
+#ifdef CANVAS_DEBUG
+ if (DEBUG_ENABLED(PBD::DEBUG::CanvasRender)) {
+ cerr << "RENDER: " << area << endl;
+ //cerr << "CANVAS @ " << this << endl;
+ //dump (cerr);
+ //cerr << "-------------------------\n";
+ }
+#endif
+
+ render_count = 0;
+
+ boost::optional<Rect> root_bbox = _root.bounding_box();
+ if (!root_bbox) {
+ /* the root has no bounding box, so there's nothing to render */
+ return;
+ }
+
+ boost::optional<Rect> draw = root_bbox->intersection (area);
+ if (draw) {
- queue_draw_area (floor (area.x0), floor (area.y0), ceil (area.width()), ceil (area.height()));
++
+ /* there's a common area between the root and the requested
+ area, so render it.
+ */
+
+ _root.render (*draw, context);
++
++ // This outlines the rect being rendered, after it has been drawn.
++ // context->rectangle (draw->x0, draw->y0, draw->x1 - draw->x0, draw->y1 - draw->y0);
++ // context->set_source_rgba (1.0, 0, 0, 1.0);
++ // context->stroke ();
++
+ }
+
+}
+
+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<Rect> bbox = item->bounding_box ();
+ if (bbox) {
+ 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<Rect> bbox = item->bounding_box ();
+ if (bbox) {
+ 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<Rect> pre_change_bounding_box)
+{
+ if (pre_change_bounding_box) {
+ /* request a redraw of the item's old bounding box */
+ queue_draw_item_area (item, pre_change_bounding_box.get ());
+ }
+
+ boost::optional<Rect> post_change_bounding_box = item->bounding_box ();
+ if (post_change_bounding_box) {
+ /* 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
+{
+ return d.translate (Duple (_scroll_offset_x, _scroll_offset_y));
+}
+
+Duple
+Canvas::canvas_to_window (Duple const & d) const
+{
+ Duple wd = d.translate (Duple (-_scroll_offset_x, -_scroll_offset_y));
+ wd.x = round (wd.x);
+ wd.y = round (wd.y);
+ return wd;
+}
+
+Rect
+Canvas::window_to_canvas (Rect const & r) const
+{
+ return r.translate (Duple (_scroll_offset_x, _scroll_offset_y));
+}
+
+Rect
+Canvas::canvas_to_window (Rect const & r) const
+{
+ Rect wr = r.translate (Duple (-_scroll_offset_x, -_scroll_offset_y));
+ wr.x0 = floor (wr.x0);
+ wr.x1 = ceil (wr.x1);
+ wr.y0 = floor (wr.y0);
+ wr.y1 = ceil (wr.y1);
+ return wr;
+}
+
+/** 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<Rect> 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<Rect> 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)
+{
+ ArdourCanvas::Rect canvas_area = item->item_to_canvas (area);
+ // cerr << "CANVAS " << this << " for " << item->whatami() << ' ' << item->name << " invalidate " << area << " TRANSLATE AS " << canvas_area << endl;
+ request_redraw (canvas_area);
+}
+
+/** Construct a GtkCanvas */
+GtkCanvas::GtkCanvas ()
+ : _current_item (0)
+ , _new_current_item (0)
+ , _grabbed_item (0)
+ , _focused_item (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::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<const Gdk::Window> pointer_window = Gdk::Display::get_default()->get_window_at_pointer (x, y);
+
+ if (pointer_window != get_window()) {
+ return;
+ }
+
+ pick_current_item (window_to_canvas (Duple (x, y)), state);
+}
+
+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 position */
+
+ vector<Item const *> items;
+ _root.add_items_at_point (point, items);
+
+ /* 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<Item const *>::const_iterator i;
+ list<Item const *> within_items;
+
+ for (i = items.begin(); i != items.end(); ++i) {
+
+ Item const * new_item = *i;
+
+ /* We ignore groups and we ignore items that ignore events */
+
+ if (new_item->ignore_events() || dynamic_cast<Group const *>(new_item) != 0) {
+ continue;
+ }
+
+ within_items.push_front (new_item);
+ }
+
+ if (within_items.empty()) {
+
+ /* no items at point, just send leave event below */
+
+ } else {
+ if (within_items.front() == _current_item) {
+ /* uppermost item at point is already _current_item */
+ return;
+ }
+
+ _new_current_item = const_cast<Item*> (within_items.front());
+ }
+
+ deliver_enter_leave (point, state);
+}
+
+void
+GtkCanvas::deliver_enter_leave (Duple const & point, int state)
+{
+ /* setup enter & leave event structures */
+
+ GdkEventCrossing enter_event;
+ enter_event.type = GDK_ENTER_NOTIFY;
+ enter_event.window = get_window()->gobj();
+ enter_event.send_event = 0;
+ enter_event.subwindow = 0;
+ enter_event.mode = GDK_CROSSING_NORMAL;
+ enter_event.focus = FALSE;
+ enter_event.state = state;
+ enter_event.x = point.x;
+ enter_event.y = point.y;
+
+ GdkEventCrossing leave_event = enter_event;
+ leave_event.type = GDK_LEAVE_NOTIFY;
+
+ Item* i;
+ GdkNotifyType enter_detail;
+ GdkNotifyType leave_detail;
+ vector<Item*> items_to_leave_virtual;
+ vector<Item*> 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 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 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);
+ }
+
+ leave_event.detail = GDK_NOTIFY_VIRTUAL;
+ enter_event.detail = GDK_NOTIFY_VIRTUAL;
+
+ for (vector<Item*>::iterator it = items_to_leave_virtual.begin(); it != items_to_leave_virtual.end(); ++it) {
+ if (!(*it)->ignore_events()) {
+ (*it)->Event ((GdkEvent*)&leave_event);
+ }
+ }
+
+ for (vector<Item*>::iterator it = items_to_enter_virtual.begin(); it != items_to_enter_virtual.end(); ++it) {
+ if (!(*it)->ignore_events()) {
+ (*it)->Event ((GdkEvent*)&enter_event);
+ }
+ }
+
+ if (_new_current_item && !_new_current_item->ignore_events()) {
+ enter_event.detail = enter_detail;
+ _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 */
+
+ 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));
+ return _grabbed_item->Event (event);
+ }
+
+ if (!_current_item) {
+ return false;
+ }
+
+ /* run through the items from child to parent, until one claims the event */
+
+ Item* item = const_cast<Item*> (_current_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 left unhandled by %1 %2\n", item->whatami(), item->name.empty() ? "[unknown]" : item->name));
+
+ 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<Rect> bounding_box)
+{
+ if (bounding_box) {
+ queue_draw_item_area (item, bounding_box.get ());
+ }
+
+ /* no need to send a leave event to this item, since it is going away
+ */
+
+ if (_new_current_item == item) {
+ _new_current_item = 0;
+ }
+
+ if (_current_item == item) {
+ _current_item = 0;
+ }
+
+ if (_grabbed_item == item) {
+ _grabbed_item = 0;
+ }
+
+ if (_focused_item == item) {
+ _focused_item = 0;
+ }
+
+ pick_current_item (0); // no mouse state
+
+}
+
+/** Handler for GDK expose events.
+ * @param ev Event.
+ * @return true if the event was handled.
+ */
+bool
+GtkCanvas::on_expose_event (GdkEventExpose* ev)
+{
+ Cairo::RefPtr<Cairo::Context> c = get_window()->create_cairo_context ();
+
+ render (Rect (ev->area.x, ev->area.y, ev->area.x + ev->area.width, ev->area.y + ev->area.height), c);
+
+ return true;
+}
+
+/** @return Our Cairo context, or 0 if we don't have one */
+Cairo::RefPtr<Cairo::Context>
+GtkCanvas::context ()
+{
+ Glib::RefPtr<Gdk::Window> w = get_window ();
+ if (!w) {
+ return Cairo::RefPtr<Cairo::Context> ();
+ }
+
+ return w->create_cairo_context ();
+}
+
+/** 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 where = window_to_canvas (Duple (ev->x, ev->y));
+
+ 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.
+ */
+
+ pick_current_item (where, ev->state);
+ DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas button press @ %1, %2 => %3\n", ev->x, ev->y, where));
+ return deliver_event (reinterpret_cast<GdkEvent*>(©));
+}
+
+/** 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 where = window_to_canvas (Duple (ev->x, ev->y));
+
+ pick_current_item (where, 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.
+ */
+
+ pick_current_item (where, ev->state);
+ DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas button release @ %1, %2 => %3\n", ev->x, ev->y, where));
+ return deliver_event (reinterpret_cast<GdkEvent*>(©));
+}
+
+/** Handler for GDK motion events.
+ * @param ev Event.
+ * @return true if the event was handled.
+ */
+bool
+GtkCanvas::on_motion_notify_event (GdkEventMotion* ev)
+{
+ /* 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\n", ev->x, ev->y));
+
+ if (_grabbed_item) {
+ /* if we have a grabbed item, it gets just the motion event,
+ since no enter/leave events can have happened.
+ */
+ DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("%1 %2 (%3) was grabbed, send MOTION event there\n",
+ _grabbed_item, _grabbed_item->whatami(), _grabbed_item->name));
+ return _grabbed_item->Event (reinterpret_cast<GdkEvent*> (©));
+ }
+
+ pick_current_item (where, 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<GdkEvent*> (©));
+}
+
+bool
+GtkCanvas::on_enter_notify_event (GdkEventCrossing* ev)
+{
+ Duple where = window_to_canvas (Duple (ev->x, ev->y));
+ pick_current_item (where, ev->state);
+ return true;
+}
+
+bool
+GtkCanvas::on_leave_notify_event (GdkEventCrossing* ev)
+{
+ _new_current_item = 0;
+ Duple where = window_to_canvas (Duple (ev->x, ev->y));
+ deliver_enter_leave (where, ev->state);
+ return true;
+}
+
+/** Called to request a redraw of our canvas.
+ * @param area Area to redraw, in canvas coordinates.
+ */
+void
+GtkCanvas::request_redraw (Rect const & request)
+{
+ Rect area = canvas_to_window (request);
++ queue_draw_area (area.x0, area.y0, area.width(), 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 canvas coordinates */
+Rect
+GtkCanvas::visible_area () const
+{
+ Distance const xo = _scroll_offset_x;
+ Distance const yo = _scroll_offset_y;
+ return Rect (xo, yo, xo + get_allocation().get_width (), yo + get_allocation().get_height ());
+}
+
+/** 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;
+}
+
projects / ardour.git / commitdiff