*/
+#if !defined USE_CAIRO_IMAGE_SURFACE && !defined NDEBUG
+#define OPTIONAL_CAIRO_IMAGE_SURFACE
+#endif
+
/** @file canvas/canvas.cc
* @brief Implementation of the main canvas classes.
*/
#include <cassert>
#include <gtkmm/adjustment.h>
#include <gtkmm/label.h>
+#include <gtkmm/window.h>
#include "pbd/compose.h"
#include "pbd/stacktrace.h"
#include "canvas/canvas.h"
+#include "canvas/colors.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 ();
}
(*i)->scroll_to (Duple (x, y));
}
- pick_current_item (0); // no current mouse position
+ pick_current_item (0); // no current mouse position
}
void
#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 */
boost::optional<Rect> 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);
-#ifdef CANVAS_DEBUG
+#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;
std::string
Canvas::indent() const
-{
+{
string s;
for (int n = 0; n < ArdourCanvas::dump_depth; ++n) {
std::string
Canvas::render_indent() const
-{
+{
string s;
for (int n = 0; n < ArdourCanvas::render_depth; ++n) {
{
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_changed (Item* item, boost::optional<Rect> pre_change_bounding_box)
{
-
+
Rect window_bbox = visible_area ();
if (pre_change_bounding_box) {
boost::optional<Rect> 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<Item*> const& root_children (_root.items());
+ ScrollGroup* best_group = 0;
ScrollGroup* sg = 0;
/* if the coordinates are negative, clamp to zero and find the item
in_window.y = 0;
}
- for (std::list<Item*>::const_iterator i = root_children.begin(); i != root_children.end(); ++i) {
- if (((sg = dynamic_cast<ScrollGroup*>(*i)) != 0) && sg->covers_window (in_window)) {
- break;
+ for (list<ScrollGroup*>::const_iterator s = scrollers.begin(); s != scrollers.end(); ++s) {
+
+ if ((*s)->covers_window (in_window)) {
+ sg = *s;
+
+ /* XXX January 22nd 2015: leaving this in place for now
+ * but I think it fixes a bug that really should be
+ * fixed in a different way (and will be) by my next
+ * commit. But it may still be relevant.
+ */
+
+ /* If scroll groups overlap, choose the one with the highest sensitivity,
+ that is, choose an HV scroll group over an H or V
+ only group.
+ */
+ if (!best_group || sg->sensitivity() > best_group->sensitivity()) {
+ best_group = sg;
+ if (sg->sensitivity() == (ScrollGroup::ScrollsVertically | ScrollGroup::ScrollsHorizontally)) {
+ /* Can't do any better than this. */
+ break;
+ }
+ }
}
}
- if (sg) {
- return d.translate (sg->scroll_offset());
+ if (best_group) {
+ return d.translate (best_group->scroll_offset());
}
return d;
break;
}
}
-
if (sg) {
wd = d.translate (-sg->scroll_offset());
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<Rect> 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)
+ , _single_exposure (1)
+ , current_tooltip_item (0)
+ , tooltip_window (0)
+ , _in_dtor (false)
{
/* 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);
+ Gdk::SCROLL_MASK | Gdk::ENTER_NOTIFY_MASK | Gdk::LEAVE_NOTIFY_MASK |
+ Gdk::KEY_PRESS_MASK | Gdk::KEY_RELEASE_MASK);
}
void
* 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()) {
if (DEBUG_ENABLED(PBD::DEBUG::CanvasEnterLeave)) {
for (vector<Item const*>::const_iterator it = items.begin(); it != items.end(); ++it) {
#ifdef CANVAS_DEBUG
- std::cerr << "\tItem " << (*it)->whatami() << '/' << (*it)->name << std::endl;
+ std::cerr << "\tItem " << (*it)->whatami() << '/' << (*it)->name << " ignore events ? " << (*it)->ignore_events() << " vis ? " << (*it)->visible() << std::endl;
#else
- std::cerr << "\tItem " << (*it)->whatami() << std::endl;
+ std::cerr << "\tItem " << (*it)->whatami() << '/' << " ignore events ? " << (*it)->ignore_events() << " vis ? " << (*it)->visible() << std::endl;
#endif
}
}
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;
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<Item*> (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
{
/* setup enter & leave event structures */
+ Glib::RefPtr<Gdk::Window> win = get_window();
+
+ if (!win) {
+ return;
+ }
+
GdkEventCrossing enter_event;
enter_event.type = GDK_ENTER_NOTIFY;
- enter_event.window = get_window()->gobj();
+ enter_event.window = win->gobj();
enter_event.send_event = 0;
enter_event.subwindow = 0;
enter_event.mode = GDK_CROSSING_NORMAL;
/* 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;
leave_event.type = GDK_LEAVE_NOTIFY;
Item* i;
- GdkNotifyType enter_detail;
- GdkNotifyType leave_detail;
+ GdkNotifyType enter_detail = GDK_NOTIFY_UNKNOWN;
+ GdkNotifyType leave_detail = GDK_NOTIFY_UNKNOWN;
vector<Item*> items_to_leave_virtual;
vector<Item*> items_to_enter_virtual;
enter_detail = GDK_NOTIFY_UNKNOWN;
/* no current item, so also send virtual enter events to the
- * entire heirarchy for the new item
+ * entire heirarchy for the new item
*/
for (i = _new_current_item->parent(); i ; i = i->parent()) {
} 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")
+ * 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_NONLINEAR;
leave_detail = GDK_NOTIFY_NONLINEAR;
}
-
+
if (_current_item && !_current_item->ignore_events ()) {
leave_event.detail = leave_detail;
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);
}
/* run through the items from child to parent, until one claims the event */
Item* item = const_cast<Item*> (event_item);
-
+
while (item) {
Item* parent = item->parent ();
- if (!item->ignore_events () &&
+ 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) {
if (bounding_box) {
queue_draw_item_area (item, bounding_box.get ());
}
-
+
if (_new_current_item == item) {
_new_current_item = 0;
}
_focused_item = 0;
}
+ if (current_tooltip_item) {
+ current_tooltip_item = 0;
+ stop_tooltip_timeout ();
+ }
+
ScrollGroup* sg = dynamic_cast<ScrollGroup*>(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
+ /* 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 OPTIONAL_CAIRO_IMAGE_SURFACE
+ if (getenv("ARDOUR_IMAGE_SURFACE")) {
+#endif
+#if defined USE_CAIRO_IMAGE_SURFACE || defined OPTIONAL_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
+#ifdef OPTIONAL_CAIRO_IMAGE_SURFACE
+ }
+#endif
}
/** Handler for GDK expose events.
bool
GtkCanvas::on_expose_event (GdkEventExpose* ev)
{
- Cairo::RefPtr<Cairo::Context> cairo_context = 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), cairo_context);
- return true;
-}
+ if (_in_dtor) {
+ 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> ();
+#ifdef OPTIONAL_CAIRO_IMAGE_SURFACE
+ Cairo::RefPtr<Cairo::Context> draw_context;
+ Cairo::RefPtr<Cairo::Context> window_context;
+ if (getenv("ARDOUR_IMAGE_SURFACE")) {
+ if (!canvas_image) {
+ canvas_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, get_width(), get_height());
+ }
+ draw_context = Cairo::Context::create (canvas_image);
+ window_context = get_window()->create_cairo_context ();
+ } else {
+ draw_context = get_window()->create_cairo_context ();
+ }
+#elif defined USE_CAIRO_IMAGE_SURFACE
+ if (!canvas_image) {
+ canvas_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, get_width(), get_height());
+ }
+ Cairo::RefPtr<Cairo::Context> draw_context = Cairo::Context::create (canvas_image);
+ Cairo::RefPtr<Cairo::Context> window_context = get_window()->create_cairo_context ();
+#else
+ Cairo::RefPtr<Cairo::Context> draw_context = get_window()->create_cairo_context ();
+#endif
+
+ /* draw background color */
+
+ draw_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
+ draw_context->clip_preserve ();
+ set_source_rgba (draw_context, _bg_color);
+ draw_context->fill ();
+
+ /* render canvas */
+ if ( _single_exposure ) {
+
+ render (Rect (ev->area.x, ev->area.y, ev->area.x + ev->area.width, ev->area.y + ev->area.height), draw_context);
+
+ } else {
+ GdkRectangle* rects;
+ gint nrects;
+
+ gdk_region_get_rectangles (ev->region, &rects, &nrects);
+ for (gint n = 0; n < nrects; ++n) {
+ draw_context->set_identity_matrix(); //reset the cairo matrix, just in case someone left it transformed after drawing ( cough )
+ render (Rect (rects[n].x, rects[n].y, rects[n].x + rects[n].width, rects[n].y + rects[n].height), draw_context);
+ }
+ g_free (rects);
+ }
+
+#ifdef OPTIONAL_CAIRO_IMAGE_SURFACE
+ if (getenv("ARDOUR_IMAGE_SURFACE")) {
+#endif
+#if defined USE_CAIRO_IMAGE_SURFACE || defined OPTIONAL_CAIRO_IMAGE_SURFACE
+ /* 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
+#ifdef OPTIONAL_CAIRO_IMAGE_SURFACE
}
+#endif
- return w->create_cairo_context ();
+ return true;
}
/** Handler for GDK scroll events.
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.
*/
return deliver_event (reinterpret_cast<GdkEvent*>(©));
}
+/** Handler for GDK key press events.
+ * @param ev Event.
+ * @return true if the event was handled.
+ */
+bool
+GtkCanvas::on_key_press_event (GdkEventKey* ev)
+{
+ DEBUG_TRACE (PBD::DEBUG::CanvasEvents, "canvas key press\n");
+ return deliver_event (reinterpret_cast<GdkEvent*>(ev));
+}
+
+/** Handler for GDK key release events.
+ * @param ev Event.
+ * @return true if the event was handled.
+ */
+bool
+GtkCanvas::on_key_release_event (GdkEventKey* ev)
+{
+ DEBUG_TRACE (PBD::DEBUG::CanvasEvents, "canvas key release\n");
+ return deliver_event (reinterpret_cast<GdkEvent*>(ev));
+}
+
/** Handler for GDK button press events.
* @param ev Event.
* @return true if the event was handled.
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));
+ DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas button press %1 @ %2, %3 => %4\n", ev->button, ev->x, ev->y, where));
return deliver_event (reinterpret_cast<GdkEvent*>(©));
}
*/
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;
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));
+ DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas button release %1 @ %2, %3 => %4\n", ev->button, ev->x, ev->y, where));
return deliver_event (reinterpret_cast<GdkEvent*>(©));
}
bool
GtkCanvas::on_motion_notify_event (GdkEventMotion* ev)
{
+ hide_tooltip ();
+
/* translate event coordinates from window to canvas */
GdkEvent copy = *((GdkEvent*)ev);
copy.motion.x = where.x;
copy.motion.y = where.y;
- /* Coordinates in "copy" will be canvas coordinates,
+ /* 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));
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;
void
GtkCanvas::request_redraw (Rect const & request)
{
+ if (_in_dtor) {
+ return;
+ }
+
Rect real_area;
Coord const w = width ();
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 (1);
+ 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<Gtk::Window*>(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 += 30;
+ tooltip_window_origin.y += 45;
+
+ /* 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 ();
+
+ // Delete the tooltip window so it'll get re-created
+ // (i.e. properly re-sized) on the next usage.
+ delete tooltip_window;
+ tooltip_window = NULL;
+ }
+}
+
/** Create a GtkCanvaSViewport.
* @param hadj Adjustment to use for horizontal scrolling.
* @param vadj Adjustment to use for vertica scrolling.
GtkCanvasViewport::on_size_request (Gtk::Requisition* req)
{
/* force the canvas to size itself */
- // _canvas.root()->bounding_box();
+ // _canvas.root()->bounding_box();
req->width = 16;
req->height = 16;
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