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/*
silence_ui.cpp - LV2 Toolkit UI Example
Copyright (C) 2012 Michael Fisher <mfisher31@gmail.com>
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 silence_ui.cpp
Demonstrates of creating a GtkUI manually without the GtkUI Mixin.
*/
#include <gtkmm.h>
#include <lvtk/ui.hpp>
#include "silence.h"
using namespace lvtk;
using namespace Gtk;
using namespace sigc;
using Glib::ustring;
/* An atom-like struct for raw MIDI note on/offs */
struct midi_t {
LV2_Atom atom;
uint8_t midi[3];
};
/* The Silence UI- Notice GtkUI<true> is not added here. The
required widget() method impl is done manually without
a toolkit mixin */
class SilenceGtk : public UI<SilenceGtk, URID<true> >
{
public:
SilenceGtk (const char* plugin_uri)
{
/* Required before creating widgets */
Gtk::Main::init_gtkmm_internals();
/* Create the container with @c new because we don't
know if the host is using Gtkmm or not */
p_hbox = new Gtk::HBox();
if (p_hbox) {
Button *btn = manage (new Button(ustring("Silence")));
btn->signal_pressed().connect(
mem_fun(*this, &SilenceGtk::send_note_on));
btn->signal_released().connect(
mem_fun(*this, &SilenceGtk::send_note_off));
p_hbox->pack_start (*btn);
} else {
p_hbox = 0;
}
}
/* Required implementation by the UI class. The UI library will ALWAYS
try to execute a @c widget() method during instantiation. The
toolkit mixins implement this method. Since we aren't using a mixin,
we have to do it ourselves.
This is really easy for gtkmm. However, you can return ANY pointer here
as the host supports the 'widget type' you are returning. */
LV2UI_Widget*
widget()
{
/* If the HBox is NULL at this point, it will prevent the UI from
instantiating */
if (p_hbox) {
/* LV2 GtkUI expects a Gtk C Object. cast one to an LV2UI_Widget */
return widget_cast (p_hbox->gobj());
}
return NULL;
}
protected:
/* Raw MIDI Senders */
void
send_note_on()
{
LV2_URID xfer = map(LV2_ATOM__eventTransfer);
LV2_URID midiEvent = map(LV2_MIDI__MidiEvent);
midi_t midi = {{3, midiEvent}, { 0x90, 0x40, 0x40 }};
write (p_midi, sizeof(midi), xfer, (void*)&midi);
}
void
send_note_off()
{
LV2_URID xfer = map(LV2_ATOM__eventTransfer);
LV2_URID midiEvent = map(LV2_MIDI__MidiEvent);
midi_t midi = {{3, midiEvent},{ 0x80, 0x40, 0x40 }};
write (p_midi, sizeof(midi), xfer, (void*)&midi);
}
private:
/* The container object */
Gtk::HBox *p_hbox;
};
int _ = SilenceGtk::register_class ("http://lvtoolkit.org/plugins/silence#ui");
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