#include <gtkmm/menu.h>
#include <gtkmm/menushell.h>
#include <gtkmm/menu_elems.h>
+#include <gtkmm/window.h>
#include "ardour/bundle.h"
#include "ardour/types.h"
#include "ardour/session.h"
#include "ardour/route.h"
#include "port_matrix.h"
#include "port_matrix_body.h"
+#include "port_matrix_component.h"
#include "i18n.h"
+using namespace std;
+using namespace sigc;
+using namespace Gtk;
+using namespace ARDOUR;
+
/** PortMatrix constructor.
* @param session Our session.
* @param type Port type that we are handling.
*/
-PortMatrix::PortMatrix (ARDOUR::Session& session, ARDOUR::DataType type)
- : Gtk::Table (2, 2),
+PortMatrix::PortMatrix (Window* parent, Session& session, DataType type)
+ : Table (2, 2),
_session (session),
+ _parent (parent),
_type (type),
- _column_visibility_box_added (false),
- _row_visibility_box_added (false),
_menu (0),
- _setup_once (false),
_arrangement (TOP_TO_RIGHT),
_row_index (0),
_column_index (1),
_min_height_divisor (1),
- _show_only_bundles (false)
+ _show_only_bundles (false),
+ _inhibit_toggle_show_only_bundles (false)
{
_body = new PortMatrixBody (this);
_ports[i].set_type (type);
/* watch for the content of _ports[] changing */
- _ports[i].Changed.connect (sigc::mem_fun (*this, &PortMatrix::setup));
+ _ports[i].Changed.connect (mem_fun (*this, &PortMatrix::setup));
}
- _row_visibility_box.pack_start (_row_visibility_label, Gtk::PACK_SHRINK);
- _column_visibility_box.pack_start (_column_visibility_label, Gtk::PACK_SHRINK);
-
- _hscroll.signal_value_changed().connect (sigc::mem_fun (*this, &PortMatrix::hscroll_changed));
- _vscroll.signal_value_changed().connect (sigc::mem_fun (*this, &PortMatrix::vscroll_changed));
+ _hscroll.signal_value_changed().connect (mem_fun (*this, &PortMatrix::hscroll_changed));
+ _vscroll.signal_value_changed().connect (mem_fun (*this, &PortMatrix::vscroll_changed));
/* watch for routes being added or removed */
- _session.RouteAdded.connect (sigc::hide (sigc::mem_fun (*this, &PortMatrix::routes_changed)));
+ _session.RouteAdded.connect (sigc::hide (mem_fun (*this, &PortMatrix::routes_changed)));
/* and also bundles */
- _session.BundleAdded.connect (sigc::hide (sigc::mem_fun (*this, &PortMatrix::setup_global_ports)));
+ _session.BundleAdded.connect (sigc::hide (mem_fun (*this, &PortMatrix::setup_global_ports)));
reconnect_to_routes ();
+ attach (*_body, 0, 1, 0, 1);
+ attach (_vscroll, 1, 2, 0, 1, SHRINK);
+ attach (_hscroll, 0, 1, 1, 2, FILL | EXPAND, SHRINK);
+
show_all ();
}
PortMatrix::~PortMatrix ()
{
delete _body;
-
- for (std::vector<Gtk::CheckButton*>::iterator i = _column_visibility_buttons.begin(); i != _column_visibility_buttons.end(); ++i) {
- delete *i;
- }
-
- for (std::vector<Gtk::CheckButton*>::iterator i = _row_visibility_buttons.begin(); i != _row_visibility_buttons.end(); ++i) {
- delete *i;
- }
-
delete _menu;
}
void
PortMatrix::reconnect_to_routes ()
{
- for (std::vector<sigc::connection>::iterator i = _route_connections.begin(); i != _route_connections.end(); ++i) {
+ for (vector<connection>::iterator i = _route_connections.begin(); i != _route_connections.end(); ++i) {
i->disconnect ();
}
_route_connections.clear ();
- boost::shared_ptr<ARDOUR::RouteList> routes = _session.get_routes ();
- for (ARDOUR::RouteList::iterator i = routes->begin(); i != routes->end(); ++i) {
+ boost::shared_ptr<RouteList> routes = _session.get_routes ();
+ for (RouteList::iterator i = routes->begin(); i != routes->end(); ++i) {
_route_connections.push_back (
- (*i)->processors_changed.connect (sigc::mem_fun (*this, &PortMatrix::setup_global_ports))
+ (*i)->processors_changed.connect (mem_fun (*this, &PortMatrix::setup_global_ports))
);
}
}
void
PortMatrix::setup ()
{
- select_arrangement ();
+ if ((get_flags () & Gtk::REALIZED) == 0) {
+ select_arrangement ();
+ }
+
_body->setup ();
setup_scrollbars ();
queue_draw ();
- if (_setup_once) {
-
- /* we've set up before, so we need to clean up before re-setting-up */
- /* XXX: we ought to be able to do this by just getting a list of children
- from each container widget, but I couldn't make that work */
-
- for (std::vector<Gtk::CheckButton*>::iterator i = _column_visibility_buttons.begin(); i != _column_visibility_buttons.end(); ++i) {
- _column_visibility_box.remove (**i);
- delete *i;
- }
-
- _column_visibility_buttons.clear ();
-
- for (std::vector<Gtk::CheckButton*>::iterator i = _row_visibility_buttons.begin(); i != _row_visibility_buttons.end(); ++i) {
- _row_visibility_box.remove (**i);
- delete *i;
- }
-
- _row_visibility_buttons.clear ();
-
- _scroller_table.remove (_vscroll);
- _scroller_table.remove (*_body);
- _scroller_table.remove (_hscroll);
-
- remove (_scroller_table);
- if (_row_visibility_box_added) {
- remove (_row_visibility_box);
- }
-
- if (_column_visibility_box_added) {
- remove (_column_visibility_box);
- }
- }
-
- if (_column_index == 0) {
- _column_visibility_label.set_text (_("Show Outputs"));
- _row_visibility_label.set_text (_("Show Inputs"));
- } else {
- _column_visibility_label.set_text (_("Show Inputs"));
- _row_visibility_label.set_text (_("Show Outputs"));
- }
-
- for (PortGroupList::List::const_iterator i = columns()->begin(); i != columns()->end(); ++i) {
- Gtk::CheckButton* b = new Gtk::CheckButton ((*i)->name);
- b->set_active ((*i)->visible());
- boost::weak_ptr<PortGroup> w (*i);
- b->signal_toggled().connect (sigc::bind (sigc::mem_fun (*this, &PortMatrix::visibility_toggled), w, b));
- _column_visibility_buttons.push_back (b);
- _column_visibility_box.pack_start (*b, Gtk::PACK_SHRINK);
- }
-
- for (PortGroupList::List::const_iterator i = rows()->begin(); i != rows()->end(); ++i) {
- Gtk::CheckButton* b = new Gtk::CheckButton ((*i)->name);
- b->set_active ((*i)->visible());
- boost::weak_ptr<PortGroup> w (*i);
- b->signal_toggled().connect (sigc::bind (sigc::mem_fun (*this, &PortMatrix::visibility_toggled), w, b));
- _row_visibility_buttons.push_back (b);
- _row_visibility_box.pack_start (*b, Gtk::PACK_SHRINK);
- }
-
- if (_arrangement == TOP_TO_RIGHT) {
-
- _scroller_table.attach (_hscroll, 0, 1, 0, 1, Gtk::FILL | Gtk::EXPAND, Gtk::SHRINK);
- _scroller_table.attach (*_body, 0, 1, 1, 2);
- _scroller_table.attach (_vscroll, 1, 2, 1, 2, Gtk::SHRINK);
-
- attach (_scroller_table, 0, 1, 1, 2, Gtk::FILL | Gtk::EXPAND, Gtk::FILL | Gtk::EXPAND);
-
- if (rows()->size() > 1) {
- attach (_row_visibility_box, 1, 2, 1, 2, Gtk::SHRINK, Gtk::SHRINK);
- _row_visibility_box_added = true;
- } else {
- _row_visibility_box_added = false;
- }
-
- if (columns()->size() > 1) {
- attach (_column_visibility_box, 0, 1, 0, 1, Gtk::SHRINK, Gtk::SHRINK);
- _column_visibility_box_added = true;
- } else {
- _column_visibility_box_added = false;
- }
-
- } else {
- _scroller_table.attach (_vscroll, 0, 1, 0, 1, Gtk::SHRINK);
- _scroller_table.attach (*_body, 1, 2, 0, 1);
- _scroller_table.attach (_hscroll, 1, 2, 1, 2, Gtk::FILL | Gtk::EXPAND, Gtk::SHRINK);
-
- if (rows()->size() > 1) {
- attach (_row_visibility_box, 0, 1, 0, 1, Gtk::SHRINK, Gtk::SHRINK);
- _row_visibility_box_added = true;
- } else {
- _row_visibility_box_added = false;
- }
-
- attach (_scroller_table, 1, 2, 0, 1, Gtk::FILL | Gtk::EXPAND, Gtk::FILL | Gtk::EXPAND);
-
- if (columns()->size() > 1) {
- attach (_column_visibility_box, 1, 2, 1, 2, Gtk::SHRINK, Gtk::SHRINK);
- _column_visibility_box_added = true;
- } else {
- _column_visibility_box_added = false;
- }
- }
-
- _setup_once = true;
-
show_all ();
}
void
-PortMatrix::set_type (ARDOUR::DataType t)
+PortMatrix::set_type (DataType t)
{
_type = t;
_ports[0].set_type (_type);
void
PortMatrix::setup_scrollbars ()
{
- Gtk::Adjustment* a = _hscroll.get_adjustment ();
+ Adjustment* a = _hscroll.get_adjustment ();
a->set_lower (0);
a->set_upper (_body->full_scroll_width());
a->set_page_size (_body->alloc_scroll_width());
void
PortMatrix::disassociate_all ()
{
- ARDOUR::BundleList a = _ports[0].bundles ();
- ARDOUR::BundleList b = _ports[1].bundles ();
+ PortGroup::BundleList a = _ports[0].bundles ();
+ PortGroup::BundleList b = _ports[1].bundles ();
- for (ARDOUR::BundleList::iterator i = a.begin(); i != a.end(); ++i) {
- for (uint32_t j = 0; j < (*i)->nchannels(); ++j) {
- for (ARDOUR::BundleList::iterator k = b.begin(); k != b.end(); ++k) {
- for (uint32_t l = 0; l < (*k)->nchannels(); ++l) {
+ for (PortGroup::BundleList::iterator i = a.begin(); i != a.end(); ++i) {
+ for (uint32_t j = 0; j < i->bundle->nchannels(); ++j) {
+ for (PortGroup::BundleList::iterator k = b.begin(); k != b.end(); ++k) {
+ for (uint32_t l = 0; l < k->bundle->nchannels(); ++l) {
- ARDOUR::BundleChannel c[2] = {
- ARDOUR::BundleChannel (*i, j),
- ARDOUR::BundleChannel (*k, l)
+ BundleChannel c[2] = {
+ BundleChannel (i->bundle, j),
+ BundleChannel (k->bundle, l)
};
if (get_state (c) == PortMatrixNode::ASSOCIATED) {
return &_ports[_row_index];
}
-/** A group visibility checkbutton has been toggled.
- * @param w Group.
- * @param b Button.
- */
void
-PortMatrix::visibility_toggled (boost::weak_ptr<PortGroup> w, Gtk::CheckButton* b)
+PortMatrix::popup_menu (
+ pair<boost::shared_ptr<PortGroup>, BundleChannel> column,
+ pair<boost::shared_ptr<PortGroup>, BundleChannel> row,
+ uint32_t t
+ )
{
- boost::shared_ptr<PortGroup> g = w.lock ();
- if (!g) {
- return;
- }
+ using namespace Menu_Helpers;
- g->set_visible (b->get_active());
- _body->setup ();
- setup_scrollbars ();
- queue_draw ();
-}
-
-void
-PortMatrix::popup_channel_context_menu (int dim, uint32_t N, uint32_t t)
-{
delete _menu;
- _menu = new Gtk::Menu;
+ _menu = new Menu;
_menu->set_name ("ArdourContextMenu");
- Gtk::Menu_Helpers::MenuList& items = _menu->items ();
+ MenuList& items = _menu->items ();
- ARDOUR::BundleChannel bc;
+ boost::shared_ptr<PortGroup> pg[2];
+ pg[_column_index] = column.first;
+ pg[_row_index] = row.first;
- ARDOUR::BundleList const r = _ports[dim].bundles();
- for (ARDOUR::BundleList::const_iterator i = r.begin(); i != r.end(); ++i) {
- if (N < (*i)->nchannels ()) {
- bc = ARDOUR::BundleChannel (*i, N);
- break;
- } else {
- N -= (*i)->nchannels ();
- }
- }
+ BundleChannel bc[2];
+ bc[_column_index] = column.second;
+ bc[_row_index] = row.second;
- if (bc.bundle) {
- char buf [64];
- bool have_one = false;
-
- if (can_rename_channels (dim)) {
- snprintf (buf, sizeof (buf), _("Rename '%s'..."), bc.bundle->channel_name (bc.channel).c_str());
- boost::weak_ptr<ARDOUR::Bundle> w (bc.bundle);
- items.push_back (
- Gtk::Menu_Helpers::MenuElem (
- buf,
- sigc::bind (sigc::mem_fun (*this, &PortMatrix::rename_channel_proxy), w, bc.channel)
- )
- );
+ char buf [64];
+ bool need_separator = false;
- have_one = true;
- }
+ for (int dim = 0; dim < 2; ++dim) {
+
+ if (bc[dim].bundle) {
+
+ Menu* m = manage (new Menu);
+ MenuList& sub = m->items ();
+
+ boost::weak_ptr<Bundle> w (bc[dim].bundle);
- if (can_remove_channels (dim)) {
- snprintf (buf, sizeof (buf), _("Remove '%s'"), bc.bundle->channel_name (bc.channel).c_str());
- boost::weak_ptr<ARDOUR::Bundle> w (bc.bundle);
- items.push_back (
- Gtk::Menu_Helpers::MenuElem (
- buf,
- sigc::bind (sigc::mem_fun (*this, &PortMatrix::remove_channel_proxy), w, bc.channel)
- )
+ if (can_add_channel (bc[dim].bundle)) {
+ snprintf (buf, sizeof (buf), _("Add %s"), channel_noun().c_str());
+ sub.push_back (MenuElem (buf, bind (mem_fun (*this, &PortMatrix::add_channel_proxy), w)));
+ }
+
+
+ if (can_rename_channels (bc[dim].bundle)) {
+ snprintf (buf, sizeof (buf), _("Rename '%s'..."), bc[dim].bundle->channel_name (bc[dim].channel).c_str());
+ sub.push_back (
+ MenuElem (
+ buf,
+ bind (mem_fun (*this, &PortMatrix::rename_channel_proxy), w, bc[dim].channel)
+ )
+ );
+ }
+
+ sub.push_back (SeparatorElem ());
+
+ if (can_remove_channels (bc[dim].bundle)) {
+ snprintf (buf, sizeof (buf), _("Remove '%s'"), bc[dim].bundle->channel_name (bc[dim].channel).c_str());
+ sub.push_back (
+ MenuElem (
+ buf,
+ bind (mem_fun (*this, &PortMatrix::remove_channel_proxy), w, bc[dim].channel)
+ )
+ );
+ }
+
+ if (_show_only_bundles) {
+ snprintf (buf, sizeof (buf), _("%s all"), disassociation_verb().c_str());
+ } else {
+ snprintf (
+ buf, sizeof (buf), _("%s all from '%s'"),
+ disassociation_verb().c_str(),
+ bc[dim].bundle->channel_name (bc[dim].channel).c_str()
+ );
+ }
+
+ sub.push_back (
+ MenuElem (buf, bind (mem_fun (*this, &PortMatrix::disassociate_all_on_channel), w, bc[dim].channel, dim))
);
- have_one = true;
+ items.push_back (MenuElem (bc[dim].bundle->name().c_str(), *m));
+ need_separator = true;
}
- if (have_one) {
- items.push_back (Gtk::Menu_Helpers::SeparatorElem ());
- }
-
- boost::weak_ptr<ARDOUR::Bundle> w (bc.bundle);
- items.push_back (Gtk::Menu_Helpers::MenuElem (
- _("Disassociate all"),
- sigc::bind (sigc::mem_fun (*this, &PortMatrix::disassociate_all_on_channel), w, bc.channel, dim)
- )
- );
+ }
+
+ if (need_separator) {
+ items.push_back (SeparatorElem ());
+ }
+
+ need_separator = false;
+
+ for (int dim = 0; dim < 2; ++dim) {
+
+ if (pg[dim]) {
+
+ boost::weak_ptr<PortGroup> wp (pg[dim]);
- _menu->popup (1, t);
+ if (pg[dim]->visible()) {
+ if (dim == 0) {
+ if (pg[dim]->name.empty()) {
+ snprintf (buf, sizeof (buf), _("Hide sources"));
+ } else {
+ snprintf (buf, sizeof (buf), _("Hide '%s' sources"), pg[dim]->name.c_str());
+ }
+ } else {
+ if (pg[dim]->name.empty()) {
+ snprintf (buf, sizeof (buf), _("Hide destinations"));
+ } else {
+ snprintf (buf, sizeof (buf), _("Hide '%s' destinations"), pg[dim]->name.c_str());
+ }
+ }
+
+ items.push_back (MenuElem (buf, bind (mem_fun (*this, &PortMatrix::hide_group), wp)));
+ } else {
+ if (dim == 0) {
+ if (pg[dim]->name.empty()) {
+ snprintf (buf, sizeof (buf), _("Show sources"));
+ } else {
+ snprintf (buf, sizeof (buf), _("Show '%s' sources"), pg[dim]->name.c_str());
+ }
+ } else {
+ if (pg[dim]->name.empty()) {
+ snprintf (buf, sizeof (buf), _("Show destinations"));
+ } else {
+ snprintf (buf, sizeof (buf), _("Show '%s' destinations"), pg[dim]->name.c_str());
+ }
+ }
+ items.push_back (MenuElem (buf, bind (mem_fun (*this, &PortMatrix::show_group), wp)));
+ }
+
+ need_separator = true;
+ }
+ }
+
+ if (need_separator) {
+ items.push_back (SeparatorElem ());
}
+
+ items.push_back (MenuElem (_("Rescan"), mem_fun (*this, &PortMatrix::setup_all_ports)));
+ items.push_back (CheckMenuElem (_("Show individual ports"), mem_fun (*this, &PortMatrix::toggle_show_only_bundles)));
+ CheckMenuItem* i = dynamic_cast<CheckMenuItem*> (&items.back());
+ _inhibit_toggle_show_only_bundles = true;
+ i->set_active (!_show_only_bundles);
+ _inhibit_toggle_show_only_bundles = false;
+ _menu->popup (1, t);
}
-
void
-PortMatrix::remove_channel_proxy (boost::weak_ptr<ARDOUR::Bundle> b, uint32_t c)
+PortMatrix::remove_channel_proxy (boost::weak_ptr<Bundle> b, uint32_t c)
{
- boost::shared_ptr<ARDOUR::Bundle> sb = b.lock ();
+ boost::shared_ptr<Bundle> sb = b.lock ();
if (!sb) {
return;
}
- remove_channel (ARDOUR::BundleChannel (sb, c));
+ remove_channel (BundleChannel (sb, c));
}
void
-PortMatrix::rename_channel_proxy (boost::weak_ptr<ARDOUR::Bundle> b, uint32_t c)
+PortMatrix::rename_channel_proxy (boost::weak_ptr<Bundle> b, uint32_t c)
{
- boost::shared_ptr<ARDOUR::Bundle> sb = b.lock ();
+ boost::shared_ptr<Bundle> sb = b.lock ();
if (!sb) {
return;
}
- rename_channel (ARDOUR::BundleChannel (sb, c));
+ rename_channel (BundleChannel (sb, c));
}
void
-PortMatrix::disassociate_all_on_channel (boost::weak_ptr<ARDOUR::Bundle> bundle, uint32_t channel, int dim)
+PortMatrix::disassociate_all_on_channel (boost::weak_ptr<Bundle> bundle, uint32_t channel, int dim)
{
- boost::shared_ptr<ARDOUR::Bundle> sb = bundle.lock ();
+ boost::shared_ptr<Bundle> sb = bundle.lock ();
if (!sb) {
return;
}
- ARDOUR::BundleList a = _ports[1-dim].bundles ();
+ PortGroup::BundleList a = _ports[1-dim].bundles ();
- for (ARDOUR::BundleList::iterator i = a.begin(); i != a.end(); ++i) {
- for (uint32_t j = 0; j < (*i)->nchannels(); ++j) {
+ for (PortGroup::BundleList::iterator i = a.begin(); i != a.end(); ++i) {
+ for (uint32_t j = 0; j < i->bundle->nchannels(); ++j) {
- ARDOUR::BundleChannel c[2];
- c[dim] = ARDOUR::BundleChannel (sb, channel);
- c[1-dim] = ARDOUR::BundleChannel (*i, j);
+ BundleChannel c[2];
+ c[dim] = BundleChannel (sb, channel);
+ c[1-dim] = BundleChannel (i->bundle, j);
if (get_state (c) == PortMatrixNode::ASSOCIATED) {
set_state (c, false);
}
void
-PortMatrix::set_show_only_bundles (bool s)
+PortMatrix::toggle_show_only_bundles ()
{
- _show_only_bundles = s;
+ if (_inhibit_toggle_show_only_bundles) {
+ return;
+ }
+
+ _show_only_bundles = !_show_only_bundles;
_body->setup ();
setup_scrollbars ();
queue_draw ();
}
+
+void
+PortMatrix::hide_group (boost::weak_ptr<PortGroup> w)
+{
+ boost::shared_ptr<PortGroup> g = w.lock ();
+ if (!g) {
+ return;
+ }
+
+ g->set_visible (false);
+}
+
+void
+PortMatrix::show_group (boost::weak_ptr<PortGroup> w)
+{
+ boost::shared_ptr<PortGroup> g = w.lock ();
+ if (!g) {
+ return;
+ }
+
+ g->set_visible (true);
+}
+
+pair<uint32_t, uint32_t>
+PortMatrix::max_size () const
+{
+ pair<uint32_t, uint32_t> m = _body->max_size ();
+
+ m.first += _vscroll.get_width ();
+ m.second += _hscroll.get_height ();
+
+ return m;
+}
+
+void
+PortMatrix::setup_max_size ()
+{
+ if (!_parent) {
+ return;
+ }
+
+ pair<uint32_t, uint32_t> const m = max_size ();
+
+ GdkGeometry g;
+ g.max_width = m.first;
+ g.max_height = m.second;
+
+ _parent->set_geometry_hints (*this, g, Gdk::HINT_MAX_SIZE);
+}
+
+bool
+PortMatrix::on_scroll_event (GdkEventScroll* ev)
+{
+ double const h = _hscroll.get_value ();
+ double const v = _vscroll.get_value ();
+
+ switch (ev->direction) {
+ case GDK_SCROLL_UP:
+ _vscroll.set_value (v - PortMatrixComponent::grid_spacing ());
+ break;
+ case GDK_SCROLL_DOWN:
+ _vscroll.set_value (v + PortMatrixComponent::grid_spacing ());
+ break;
+ case GDK_SCROLL_LEFT:
+ _hscroll.set_value (h - PortMatrixComponent::grid_spacing ());
+ break;
+ case GDK_SCROLL_RIGHT:
+ _hscroll.set_value (h + PortMatrixComponent::grid_spacing ());
+ break;
+ }
+
+ return true;
+}
+
+boost::shared_ptr<IO>
+PortMatrix::io_from_bundle (boost::shared_ptr<Bundle> b) const
+{
+ boost::shared_ptr<IO> io = _ports[0].io_from_bundle (b);
+ if (!io) {
+ io = _ports[1].io_from_bundle (b);
+ }
+
+ return io;
+}
+
+bool
+PortMatrix::can_add_channel (boost::shared_ptr<Bundle> b) const
+{
+ return io_from_bundle (b);
+}
+
+void
+PortMatrix::add_channel (boost::shared_ptr<Bundle> b)
+{
+ boost::shared_ptr<IO> io = io_from_bundle (b);
+
+ if (io) {
+ io->add_port ("", this, _type);
+ }
+}
+
+bool
+PortMatrix::can_remove_channels (boost::shared_ptr<Bundle> b) const
+{
+ return io_from_bundle (b);
+}
+
+void
+PortMatrix::remove_channel (ARDOUR::BundleChannel b)
+{
+ boost::shared_ptr<IO> io = io_from_bundle (b.bundle);
+
+ if (io) {
+ Port* p = io->nth (b.channel);
+ if (p) {
+ io->remove_port (p, this);
+ }
+ }
+}
+
+void
+PortMatrix::add_channel_proxy (boost::weak_ptr<Bundle> w)
+{
+ boost::shared_ptr<Bundle> b = w.lock ();
+ if (!b) {
+ return;
+ }
+
+ add_channel (b);
+}
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