2010-11-30 15:22:43 -05:00
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/*
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Copyright (C) 2000-2007 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <iostream>
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#include <iomanip>
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#include <cstring>
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#include "pbd/controllable.h"
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#include "pbd/compose.h"
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#include "gtkmm2ext/gui_thread.h"
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#include "gtkmm2ext/gtk_ui.h"
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#include "ardour/panner.h"
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#include "stereo_panner.h"
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#include "i18n.h"
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using namespace std;
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using namespace Gtk;
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static const int pos_box_size = 10;
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static const int lr_box_size = 18;
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static const int step_down = 10;
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StereoPanner::StereoPanner (boost::shared_ptr<PBD::Controllable> position, boost::shared_ptr<PBD::Controllable> width)
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: position_control (position)
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, width_control (width)
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, dragging (false)
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, dragging_position (false)
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, drag_start_x (0)
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, last_drag_x (0)
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{
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position_control->Changed.connect (connections, invalidator(*this), boost::bind (&StereoPanner::value_change, this), gui_context());
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width_control->Changed.connect (connections, invalidator(*this), boost::bind (&StereoPanner::value_change, this), gui_context());
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set_tooltip ();
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add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::SCROLL_MASK|Gdk::POINTER_MOTION_MASK);
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}
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StereoPanner::~StereoPanner ()
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{
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}
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void
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StereoPanner::set_tooltip ()
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{
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Gtkmm2ext::UI::instance()->set_tip (this, string_compose (_("L:%1 R:%2 Width: %3%%"),
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(int) floor (position_control->get_value() * 100.0),
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(int) floor ((1.0 - position_control->get_value() * 100)),
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(int) floor (width_control->get_value() * 100.0)).c_str());
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}
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void
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StereoPanner::value_change ()
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{
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set_tooltip ();
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queue_draw ();
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}
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bool
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StereoPanner::on_expose_event (GdkEventExpose* ev)
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{
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Glib::RefPtr<Gdk::Window> win (get_window());
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Glib::RefPtr<Gdk::GC> gc (get_style()->get_base_gc (get_state()));
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cairo_t* cr = gdk_cairo_create (win->gobj());
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int x1, x2;
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int width, height;
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double pos = position_control->get_value (); /* 0..1 */
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double swidth = width_control->get_value (); /* -1..+1 */
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const int border_width = 1;
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const int border = border_width * 2;
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width = get_width();
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height = get_height ();
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/* background */
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cairo_set_source_rgb (cr, 0.184, 0.172, 0.172);
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cairo_rectangle (cr, 0, 0, width, height);
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cairo_fill (cr);
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/* leave a border */
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width -= border_width;
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height -= border_width;
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/* compute where the central box is */
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x1 = (int) floor (width * pos); // center of widget
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x2 = x1 - (int) floor ((fabs (swidth) * width)/2.0); // center, then back up half the swidth value
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x1 -= pos_box_size/2; // center, then back up by half width of position box
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/* compute & draw the line through the box */
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cairo_set_line_width (cr, 2);
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cairo_set_source_rgba (cr, 0.3137, 0.4431, 0.7843, 1.0);
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cairo_move_to (cr, border + x2, 4+(pos_box_size/2)+step_down);
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cairo_line_to (cr, border + x2, 4+(pos_box_size/2));
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cairo_line_to (cr, border + x2 + floor ((fabs (swidth * width))), 4+(pos_box_size/2));
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cairo_line_to (cr, border + x2 + floor ((fabs (swidth * width))), 4+(pos_box_size/2) + step_down);
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cairo_stroke (cr);
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/* left box */
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cairo_rectangle (cr,
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border+ x2 - lr_box_size/2,
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(lr_box_size/2)+step_down,
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lr_box_size, lr_box_size);
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cairo_set_source_rgba (cr, 0.3137, 0.4431, 0.7843, 1.0);
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cairo_stroke_preserve (cr);
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cairo_set_source_rgba (cr, 0.4509, 0.7686, 0.8627, 0.8);
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cairo_fill (cr);
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/* add text */
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cairo_move_to (cr,
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border + x2 - lr_box_size/2 + 4,
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(lr_box_size/2) + step_down + 13);
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cairo_set_source_rgba (cr, 0.129, 0.054, 0.588, 1.0);
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cairo_select_font_face (cr, "sans-serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
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cairo_show_text (cr, "L");
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/* right box */
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cairo_rectangle (cr,
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border + x2 + (int) floor ((fabs (swidth * width))) - lr_box_size/2,
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(lr_box_size/2)+step_down,
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lr_box_size, lr_box_size);
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cairo_set_source_rgba (cr, 0.3137, 0.4431, 0.7843, 1.0);
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cairo_stroke_preserve (cr);
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cairo_set_source_rgba (cr, 0.4509, 0.7686, 0.8627, 0.8);
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cairo_fill (cr);
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/* add text */
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cairo_move_to (cr,
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border + x2 + (int) floor ((fabs (swidth * width))) - lr_box_size/2 + 4,
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(lr_box_size/2)+step_down + 13);
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cairo_set_source_rgba (cr, 0.129, 0.054, 0.588, 1.0);
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cairo_show_text (cr, "R");
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/* draw the central box */
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cairo_set_line_width (cr, 1);
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cairo_rectangle (cr, border + x1, 4, pos_box_size, pos_box_size);
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cairo_set_source_rgba (cr, 0.3137, 0.4431, 0.7843, 1.0);
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cairo_stroke_preserve (cr);
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cairo_set_source_rgba (cr, 0.4509, 0.7686, 0.8627, 0.8);
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cairo_fill (cr);
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/* done */
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cairo_destroy (cr);
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return true;
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}
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bool
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StereoPanner::on_button_press_event (GdkEventButton* ev)
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{
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drag_start_x = ev->x;
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last_drag_x = ev->x;
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/* center 8 pixels are for position drag */
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int w = get_width();
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double pos = position_control->get_value ();
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if ((ev->x >= (int) floor ((pos * w)-(pos_box_size/2))) && (ev->x <= (int) floor ((pos * w)+(pos_box_size/2)))) {
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dragging_position = true;
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} else {
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dragging_position = false;
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}
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if (ev->type == GDK_2BUTTON_PRESS) {
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if (dragging_position) {
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cerr << "Reset pos\n";
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position_control->set_value (0.5); // reset position to center
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} else {
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cerr << "Reset width\n";
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width_control->set_value (1.0); // reset position to full, LR
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}
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dragging = false;
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} else {
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dragging = true;
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}
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return true;
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}
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bool
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StereoPanner::on_button_release_event (GdkEventButton* ev)
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{
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dragging = false;
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dragging_position = false;
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return true;
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}
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bool
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StereoPanner::on_motion_notify_event (GdkEventMotion* ev)
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{
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if (!dragging) {
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return false;
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}
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int w = get_width();
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float delta = (abs (ev->x - last_drag_x)) / (double) (w/2);
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if (!dragging_position) {
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double wv = width_control->get_value();
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if (((drag_start_x < w/2) && ev->x > last_drag_x) || // start left of center, move towards it
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((drag_start_x > w/2) && ev->x < last_drag_x)) { // start right of center, move towards it
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wv = wv * (1.0 - delta);
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} else {
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/* moving out, so increase the width */
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wv = wv * (1.0 + delta);
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}
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width_control->set_value (wv);
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} else {
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double pv = position_control->get_value(); // 0..1.0 ; 0 = left
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if (ev->x > last_drag_x) { // increasing
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pv = pv * (1.0 + delta);
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} else {
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pv = pv * (1.0 - delta);
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}
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position_control->set_value (pv);
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}
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last_drag_x = ev->x;
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return true;
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}
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