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livetrax/gtk2_ardour/stereo_panner.cc

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/*
Copyright (C) 2000-2007 Paul Davis
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.
*/
#include <iostream>
#include <iomanip>
#include <cstring>
#include "pbd/controllable.h"
#include "gtkmm2ext/gui_thread.h"
#include "ardour/panner.h"
#include "stereo_panner.h"
#include "i18n.h"
using namespace std;
using namespace Gtk;
StereoPanner::StereoPanner (boost::shared_ptr<PBD::Controllable> position, boost::shared_ptr<PBD::Controllable> width)
: position_control (position)
, width_control (width)
, dragging (false)
, dragging_position (false)
, drag_start_x (0)
, last_drag_x (0)
{
set_size_request (-1, 15);
position_control->Changed.connect (connections, invalidator(*this), boost::bind (&DrawingArea::queue_draw, this), gui_context());
width_control->Changed.connect (connections, invalidator(*this), boost::bind (&DrawingArea::queue_draw, this), gui_context());
add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::SCROLL_MASK|Gdk::POINTER_MOTION_MASK);
}
StereoPanner::~StereoPanner ()
{
}
bool
StereoPanner::on_expose_event (GdkEventExpose* ev)
{
Glib::RefPtr<Gdk::Window> win (get_window());
Glib::RefPtr<Gdk::GC> gc (get_style()->get_base_gc (get_state()));
cairo_t* cr = gdk_cairo_create (win->gobj());
int x1, x2;
int width, height;
double pos = position_control->get_value (); /* 0..1 */
double swidth = width_control->get_value (); /* -1..+1 */
const int pos_box_size = 5;
width = get_width();
height = get_height ();
/* compute where the central box is */
x1 = (int) floor (width * pos);
x1 -= pos_box_size/2;
cairo_set_source_rgb (cr, 255, 0, 0);
cairo_rectangle (cr, x1, 4, pos_box_size, pos_box_size);
cairo_fill (cr);
/* compute & draw the line through the box */
x2 = x1 - (int) floor ((fabs (swidth) * width)/2.0); // center, then back up half the swidth value
cairo_set_source_rgb (cr, 0, 255, 0);
cairo_move_to (cr, x2, 4+(pos_box_size/2));
cairo_line_to (cr, x2 + floor ((fabs (swidth * width))), 4+(pos_box_size/2));
cairo_stroke (cr);
cairo_destroy (cr);
return true;
}
bool
StereoPanner::on_button_press_event (GdkEventButton* ev)
{
drag_start_x = ev->x;
last_drag_x = ev->x;
/* center 8 pixels are for position drag */
int w = get_width();
double pos = position_control->get_value ();
if ((ev->x >= (int) floor ((pos * w)-4)) && (ev->x <= (int) floor ((pos * w)+4))) {
dragging_position = true;
} else {
dragging_position = false;
}
if (ev->type == GDK_2BUTTON_PRESS) {
if (dragging_position) {
cerr << "Reset pos\n";
position_control->set_value (0.5); // reset position to center
} else {
cerr << "Reset width\n";
width_control->set_value (1.0); // reset position to full, LR
}
dragging = false;
} else {
dragging = true;
}
return true;
}
bool
StereoPanner::on_button_release_event (GdkEventButton* ev)
{
dragging = false;
dragging_position = false;
return true;
}
bool
StereoPanner::on_motion_notify_event (GdkEventMotion* ev)
{
if (!dragging) {
return false;
}
int w = get_width();
float delta = (abs (ev->x - last_drag_x)) / (double) (w/2);
if (!dragging_position) {
double wv = width_control->get_value();
if (((drag_start_x < w/2) && ev->x > last_drag_x) || // start left of center, move towards it
((drag_start_x > w/2) && ev->x < last_drag_x)) { // start right of center, move towards it
wv = wv * (1.0 - delta);
} else {
/* moving out, so increase the width */
wv = wv * (1.0 + delta);
}
width_control->set_value (wv);
} else {
double pv = position_control->get_value(); // 0..1.0 ; 0 = left
if (ev->x > last_drag_x) { // increasing
pv = pv * (1.0 + delta);
} else {
pv = pv * (1.0 - delta);
}
position_control->set_value (pv);
}
last_drag_x = ev->x;
return true;
}