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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 <cmath>
#include <gtkmm/window.h>
#include "pbd/controllable.h"
#include "pbd/compose.h"
#include "gtkmm2ext/gui_thread.h"
#include "gtkmm2ext/gtk_ui.h"
#include "gtkmm2ext/keyboard.h"
#include "ardour/panner.h"
#include "ardour_ui.h"
#include "global_signals.h"
#include "stereo_panner.h"
#include "rgb_macros.h"
#include "utils.h"
#include "i18n.h"
using namespace std;
using namespace Gtk;
using namespace Gtkmm2ext;
static const int pos_box_size = 10;
static const int lr_box_size = 15;
static const int step_down = 10;
static const int top_step = 2;
StereoPanner::ColorScheme StereoPanner::colors[3];
bool StereoPanner::have_colors = false;
PBD::Signal0<void> StereoPanner::color_change;
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)
{
if (!have_colors) {
set_colors ();
have_colors = true;
}
position_control->Changed.connect (connections, invalidator(*this), boost::bind (&StereoPanner::value_change, this), gui_context());
width_control->Changed.connect (connections, invalidator(*this), boost::bind (&StereoPanner::value_change, this), gui_context());
set_tooltip ();
set_flags (Gtk::CAN_FOCUS);
add_events (Gdk::ENTER_NOTIFY_MASK|Gdk::LEAVE_NOTIFY_MASK|
Gdk::KEY_PRESS_MASK|Gdk::KEY_RELEASE_MASK|
Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|
Gdk::SCROLL_MASK|
Gdk::POINTER_MOTION_MASK);
color_change.connect (connections, invalidator (*this), boost::bind (&DrawingArea::queue_draw, this), gui_context());
}
StereoPanner::~StereoPanner ()
{
}
void
StereoPanner::set_tooltip ()
{
double pos = position_control->get_value(); // 0..1
double w = width_control->get_value (); // -1..+1
int lpos = (int) lrint ((pos - (w/2.0)) * 100.0);
int rpos = (int) lrint ((pos + (w/2.0)) * 100.0);
Gtkmm2ext::UI::instance()->set_tip (this, string_compose (_("L:%1 R:%2 Width: %3%%"),
lpos, rpos,
(int) floor (w * 100.0)).c_str());
}
void
StereoPanner::value_change ()
{
cerr << this << " Value change, pos = " << position_control->get_value() << " w = " << width_control->get_value() << endl;
set_tooltip ();
queue_draw ();
}
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 width, height;
double pos = position_control->get_value (); /* 0..1 */
double swidth = width_control->get_value (); /* -1..+1 */
double fswidth = fabs (swidth);
uint32_t o, f, t, b;
State state;
width = get_width();
height = get_height ();
if (swidth == 0.0) {
state = Mono;
} else if (swidth < 0.0) {
state = Inverted;
} else {
state = Normal;
}
o = colors[state].outline;
f = colors[state].fill;
t = colors[state].text;
b = colors[state].background;
/* background */
cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(b), UINT_RGBA_G_FLT(b), UINT_RGBA_B_FLT(b), UINT_RGBA_A_FLT(b));
cairo_rectangle (cr, 0, 0, width, height);
cairo_fill (cr);
/* compute the centers of the L/R boxes based on the current stereo width */
int usable_width = width - lr_box_size;
double center = (lr_box_size/2.0) + (usable_width * pos);
int left = lrint (center - (fswidth * usable_width / 2.0)); // center of leftmost box
int right = lrint (center + (fswidth * usable_width / 2.0)); // center of rightmost box
cerr << this << " pos " << pos << " width = " << width << " swidth = " << swidth << " center @ " << center << " L = " << left << " R = " << right << endl;
/* compute & draw the line through the box */
cairo_set_line_width (cr, 2);
cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(o), UINT_RGBA_G_FLT(o), UINT_RGBA_B_FLT(o), UINT_RGBA_A_FLT(o));
cairo_move_to (cr, left, top_step+(pos_box_size/2)+step_down);
cairo_line_to (cr, left, top_step+(pos_box_size/2));
cairo_line_to (cr, right, top_step+(pos_box_size/2));
cairo_line_to (cr, right, top_step+(pos_box_size/2) + step_down);
cairo_stroke (cr);
if (swidth < 0.0) {
/* flip where the L/R boxes are drawn */
swap (left, right);
}
/* left box */
left -= lr_box_size/2;
right -= lr_box_size/2;
cairo_rectangle (cr,
left,
(lr_box_size/2)+step_down,
lr_box_size, lr_box_size);
cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(o), UINT_RGBA_G_FLT(o), UINT_RGBA_B_FLT(o), UINT_RGBA_A_FLT(o));
cairo_stroke_preserve (cr);
cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(f), UINT_RGBA_G_FLT(f), UINT_RGBA_B_FLT(f), UINT_RGBA_A_FLT(f));
cairo_fill (cr);
/* add text */
cairo_move_to (cr,
left + 3,
(lr_box_size/2) + step_down + 13);
cairo_select_font_face (cr, "sans-serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
if (state != Mono) {
cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(t), UINT_RGBA_G_FLT(t), UINT_RGBA_B_FLT(t), UINT_RGBA_A_FLT(t));
cairo_show_text (cr, _("L"));
}
/* right box */
cairo_rectangle (cr,
right,
(lr_box_size/2)+step_down,
lr_box_size, lr_box_size);
cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(o), UINT_RGBA_G_FLT(o), UINT_RGBA_B_FLT(o), UINT_RGBA_A_FLT(o));
cairo_stroke_preserve (cr);
cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(f), UINT_RGBA_G_FLT(f), UINT_RGBA_B_FLT(f), UINT_RGBA_A_FLT(f));
cairo_fill (cr);
/* add text */
cairo_move_to (cr,
right + 3,
(lr_box_size/2)+step_down + 13);
cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(t), UINT_RGBA_G_FLT(t), UINT_RGBA_B_FLT(t), UINT_RGBA_A_FLT(t));
if (state == Mono) {
cairo_show_text (cr, _("M"));
} else {
cairo_show_text (cr, _("R"));
}
/* draw the central box */
cairo_set_line_width (cr, 1);
cairo_rectangle (cr, lrint (center - (pos_box_size/2.0)), top_step, pos_box_size, pos_box_size);
cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(o), UINT_RGBA_G_FLT(o), UINT_RGBA_B_FLT(o), UINT_RGBA_A_FLT(o));
cairo_stroke_preserve (cr);
cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(f), UINT_RGBA_G_FLT(f), UINT_RGBA_B_FLT(f), UINT_RGBA_A_FLT(f));
cairo_fill (cr);
/* done */
cairo_destroy (cr);
return true;
}
bool
StereoPanner::on_button_press_event (GdkEventButton* ev)
{
drag_start_x = ev->x;
last_drag_x = ev->x;
if (ev->y < 20) {
/* top section of widget is for position drags */
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_scroll_event (GdkEventScroll* ev)
{
double one_degree = 1.0/180.0;
double pv = position_control->get_value(); // 0..1.0 ; 0 = left
double wv = width_control->get_value(); // 0..1.0 ; 0 = left
double step;
if (Keyboard::modifier_state_contains (ev->state, Keyboard::PrimaryModifier)) {
step = one_degree;
} else {
step = one_degree * 5.0;
}
switch (ev->direction) {
case GDK_SCROLL_LEFT:
wv += step;
width_control->set_value (wv);
break;
case GDK_SCROLL_UP:
pv -= step;
position_control->set_value (pv);
break;
case GDK_SCROLL_RIGHT:
wv -= step;
width_control->set_value (wv);
break;
case GDK_SCROLL_DOWN:
pv += step;
position_control->set_value (pv);
break;
}
return true;
}
bool
StereoPanner::on_motion_notify_event (GdkEventMotion* ev)
{
if (!dragging) {
return false;
}
int w = get_width();
double delta = (abs (ev->x - last_drag_x)) / (w/2.0);
int drag_dir = 0;
if (!dragging_position) {
double wv = width_control->get_value();
int inc;
double old_wv;
double opx; // compute the operational x-coordinate given the current pos+width
if (wv > 0) {
/* positive value: increasing width means adding */
inc = 1;
} else {
/* positive value: increasing width means subtracting */
inc = -1;
}
if (drag_start_x < w/2) {
/* started left of center */
opx = position_control->get_value() - (wv/2.0);
if (opx < 0.5) {
/* still left */
if (ev->x > last_drag_x) {
/* motion to left */
cerr << "was left, still left, move left\n";
drag_dir = -inc;
} else {
cerr << "was left, still left, move right\n";
drag_dir = inc;
}
} else {
/* now right */
if (ev->x > last_drag_x) {
/* motion to left */
cerr << "was left, gone right, move left\n";
drag_dir = inc;
} else {
cerr << "was left, gone right, move right\n";
drag_dir = -inc;
}
}
} else {
/* started right of center */
opx = position_control->get_value() + (wv/2.0);
if (opx > 0.5) {
/* still right */
if (ev->x < last_drag_x) {
/* motion to right */
cerr << "was right, still right, move right\n";
drag_dir = -inc;
} else {
cerr << "was right, still right, move left\n";
drag_dir = inc;
}
} else {
/* now left */
if (ev->x < last_drag_x) {
/* motion to right */
cerr << "was right, gone left, move right\n";
drag_dir = inc;
} else {
cerr << "was right, gone left, move left\n";
drag_dir = -inc;
}
}
}
old_wv = wv;
wv = wv + (drag_dir * delta);
cerr << this << " set width to " << wv << endl;
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 + delta;
} else {
pv = pv - delta;
}
cerr << this << " set position to " << pv << endl;
position_control->set_value (pv);
}
last_drag_x = ev->x;
return true;
}
bool
StereoPanner::on_key_press_event (GdkEventKey* ev)
{
double one_degree = 1.0/180.0;
double pv = position_control->get_value(); // 0..1.0 ; 0 = left
double wv = width_control->get_value(); // 0..1.0 ; 0 = left
double step;
if (Keyboard::modifier_state_contains (ev->state, Keyboard::PrimaryModifier)) {
step = one_degree;
} else {
step = one_degree * 5.0;
}
/* up/down control width because we consider pan position more "important"
(and thus having higher "sense" priority) than width.
*/
switch (ev->keyval) {
case GDK_Up:
if (Keyboard::modifier_state_equals (ev->state, Keyboard::SecondaryModifier)) {
width_control->set_value (1.0);
} else {
width_control->set_value (wv + step);
}
break;
case GDK_Down:
if (Keyboard::modifier_state_equals (ev->state, Keyboard::SecondaryModifier)) {
width_control->set_value (-1.0);
} else {
width_control->set_value (wv - step);
}
case GDK_Left:
pv -= step;
position_control->set_value (pv);
break;
case GDK_Right:
pv += step;
position_control->set_value (pv);
break;
break;
case GDK_0:
case GDK_KP_0:
width_control->set_value (0.0);
break;
default:
return false;
}
return true;
}
bool
StereoPanner::on_key_release_event (GdkEventKey* ev)
{
return false;
}
bool
StereoPanner::on_enter_notify_event (GdkEventCrossing* ev)
{
grab_focus ();
Keyboard::magic_widget_grab_focus ();
return false;
}
bool
StereoPanner::on_leave_notify_event (GdkEventCrossing*)
{
Keyboard::magic_widget_drop_focus ();
return false;
}
void
StereoPanner::set_colors ()
{
colors[Normal].fill = ARDOUR_UI::config()->canvasvar_StereoPannerFill.get();
colors[Normal].outline = ARDOUR_UI::config()->canvasvar_StereoPannerOutline.get();
colors[Normal].text = ARDOUR_UI::config()->canvasvar_StereoPannerText.get();
colors[Normal].background = ARDOUR_UI::config()->canvasvar_StereoPannerBackground.get();
colors[Mono].fill = ARDOUR_UI::config()->canvasvar_StereoPannerMonoFill.get();
colors[Mono].outline = ARDOUR_UI::config()->canvasvar_StereoPannerMonoOutline.get();
colors[Mono].text = ARDOUR_UI::config()->canvasvar_StereoPannerMonoText.get();
colors[Mono].background = ARDOUR_UI::config()->canvasvar_StereoPannerMonoBackground.get();
colors[Inverted].fill = ARDOUR_UI::config()->canvasvar_StereoPannerInvertedFill.get();
colors[Inverted].outline = ARDOUR_UI::config()->canvasvar_StereoPannerInvertedOutline.get();
colors[Inverted].text = ARDOUR_UI::config()->canvasvar_StereoPannerInvertedText.get();
colors[Inverted].background = ARDOUR_UI::config()->canvasvar_StereoPannerInvertedBackground.get();
color_change (); /* EMIT SIGNAL */
}