460 lines
12 KiB
C++
460 lines
12 KiB
C++
/*
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Copyright (C) 2010 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 <cmath>
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#include <algorithm>
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#include <pangomm/layout.h>
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#include "pbd/compose.h"
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#include "pbd/error.h"
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#include "pbd/stacktrace.h"
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#include "gtkmm2ext/utils.h"
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#include "gtkmm2ext/rgb_macros.h"
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#include "gtkmm2ext/gui_thread.h"
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#include "gtkmm2ext/keyboard.h"
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#include "ardour/rc_configuration.h" // for widget prelight preference
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#include "ardour_knob.h"
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#include "ardour_ui.h"
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#include "global_signals.h"
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#include "canvas/colors.h"
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#include "canvas/utils.h"
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#include "i18n.h"
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using namespace Gtkmm2ext;
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using namespace Gdk;
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using namespace Gtk;
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using namespace Glib;
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using namespace PBD;
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using std::max;
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using std::min;
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using namespace std;
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ArdourKnob::Element ArdourKnob::default_elements = ArdourKnob::Element (ArdourKnob::Arc);
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ArdourKnob::ArdourKnob (Element e)
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: _elements (e)
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, _hovering (false)
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{
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ARDOUR_UI_UTILS::ColorsChanged.connect (sigc::mem_fun (*this, &ArdourKnob::color_handler));
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}
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ArdourKnob::~ArdourKnob()
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{
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}
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void
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ArdourKnob::render (cairo_t* cr, cairo_rectangle_t *)
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{
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cairo_pattern_t* shade_pattern;
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float width = get_width();
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float height = get_height();
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const float scale = min(width, height);
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const float pointer_thickness = 3.0 * (scale/80); //(if the knob is 80 pixels wide, we want a 3-pix line on it)
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float start_angle = ((180 - 65) * G_PI) / 180;
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float end_angle = ((360 + 65) * G_PI) / 180;
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float value_angle = start_angle + (_val * (end_angle - start_angle));
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float value_x = cos (value_angle);
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float value_y = sin (value_angle);
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float xc = 0.5 + width/ 2.0;
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float yc = 0.5 + height/ 2.0;
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cairo_translate (cr, xc, yc); //after this, everything is based on the center of the knob
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//get the knob color from the theme
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ArdourCanvas::Color knob_color = ARDOUR_UI::config()->color (string_compose ("%1", get_name()));
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float center_radius = 0.48*scale;
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float border_width = 0.8;
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bool arc = (_elements & Arc)==Arc;
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bool bevel = (_elements & Bevel)==Bevel;
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bool flat = _flat_buttons;
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if ( arc ) {
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center_radius = scale*0.30;
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float inner_progress_radius = scale*0.30;
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float outer_progress_radius = scale*0.48;
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float progress_width = (outer_progress_radius-inner_progress_radius);
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float progress_radius = inner_progress_radius + progress_width/2.0;
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float start_angle_x = cos (start_angle);
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float start_angle_y = sin (start_angle);
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float end_angle_x = cos (end_angle);
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float end_angle_y = sin (end_angle);
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//dark arc background
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cairo_set_source_rgb (cr, 0.3, 0.3, 0.3 );
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cairo_set_line_width (cr, progress_width);
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cairo_arc (cr, 0, 0, progress_radius, start_angle, end_angle);
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cairo_stroke (cr);
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//look up the arc colors from the config
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double red_start, green_start, blue_start, unused;
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ArdourCanvas::Color arc_start_color = ARDOUR_UI::config()->color ( string_compose ("%1: arc start", get_name()));
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ArdourCanvas::color_to_rgba( arc_start_color, red_start, green_start, blue_start, unused );
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double red_end, green_end, blue_end;
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ArdourCanvas::Color arc_end_color = ARDOUR_UI::config()->color ( string_compose ("%1: arc end", get_name()) );
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ArdourCanvas::color_to_rgba( arc_end_color, red_end, green_end, blue_end, unused );
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//vary the arc color over the travel of the knob
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float r = (1.0-_val) * red_end + _val * red_start;
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float g = (1.0-_val) * green_end + _val * green_start;
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float b = (1.0-_val) * blue_end + _val * blue_start;
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//draw the arc
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cairo_set_source_rgb (cr, r,g,b);
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cairo_set_line_width (cr, progress_width);
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cairo_arc (cr, 0, 0, progress_radius, start_angle, value_angle);
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cairo_stroke (cr);
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//shade the arc
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if (!flat) {
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shade_pattern = cairo_pattern_create_linear (0.0, -yc, 0.0, yc); //note we have to offset the pattern from our centerpoint
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cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.15);
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cairo_pattern_add_color_stop_rgba (shade_pattern, 0.5, 1,1,1, 0.0);
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cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 1,1,1, 0.0);
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cairo_set_source (cr, shade_pattern);
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cairo_arc (cr, 0, 0, outer_progress_radius-1, 0, 2.0*G_PI);
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cairo_fill (cr);
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cairo_pattern_destroy (shade_pattern);
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}
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//black border
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cairo_set_source_rgb (cr, 0, 0, 0 );
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cairo_set_line_width (cr, border_width);
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cairo_move_to (cr, (outer_progress_radius * start_angle_x), (outer_progress_radius * start_angle_y));
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cairo_line_to (cr, (inner_progress_radius * start_angle_x), (inner_progress_radius * start_angle_y));
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cairo_stroke (cr);
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cairo_move_to (cr, (outer_progress_radius * end_angle_x), (outer_progress_radius * end_angle_y));
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cairo_line_to (cr, (inner_progress_radius * end_angle_x), (inner_progress_radius * end_angle_y));
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cairo_stroke (cr);
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cairo_arc (cr, 0, 0, outer_progress_radius, start_angle, end_angle);
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cairo_stroke (cr);
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}
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if (!flat) {
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//knob shadow
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cairo_save(cr);
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cairo_translate(cr, pointer_thickness+1, pointer_thickness+1 );
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cairo_set_source_rgba (cr, 0, 0, 0, 0.1 );
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cairo_arc (cr, 0, 0, center_radius-1, 0, 2.0*G_PI);
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cairo_fill (cr);
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cairo_restore(cr);
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//inner circle
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ArdourCanvas::set_source_rgba(cr, knob_color);
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cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
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cairo_fill (cr);
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//gradient
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if (bevel) {
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//knob gradient
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shade_pattern = cairo_pattern_create_linear (0.0, -yc, 0.0, yc); //note we have to offset the gradient from our centerpoint
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cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.2);
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cairo_pattern_add_color_stop_rgba (shade_pattern, 0.2, 1,1,1, 0.2);
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cairo_pattern_add_color_stop_rgba (shade_pattern, 0.8, 0,0,0, 0.2);
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cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 0,0,0, 0.2);
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cairo_set_source (cr, shade_pattern);
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cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
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cairo_fill (cr);
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cairo_pattern_destroy (shade_pattern);
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//flat top over beveled edge
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ArdourCanvas::set_source_rgb_a (cr, knob_color, 0.5 );
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cairo_arc (cr, 0, 0, center_radius-pointer_thickness, 0, 2.0*G_PI);
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cairo_fill (cr);
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} else {
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//radial gradient
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shade_pattern = cairo_pattern_create_radial ( -center_radius, -center_radius, 1, -center_radius, -center_radius, center_radius*2.5 ); //note we have to offset the gradient from our centerpoint
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cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.2);
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cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 0,0,0, 0.3);
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cairo_set_source (cr, shade_pattern);
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cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
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cairo_fill (cr);
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cairo_pattern_destroy (shade_pattern);
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}
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} else {
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//inner circle
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ArdourCanvas::set_source_rgba(cr, knob_color);
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cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
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cairo_fill (cr);
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}
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//black knob border
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cairo_set_line_width (cr, border_width);
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cairo_set_source_rgba (cr, 0,0,0, 1 );
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cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
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cairo_stroke (cr);
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//line shadow
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if (!flat) {
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cairo_save(cr);
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cairo_translate(cr, 1, 1 );
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cairo_set_source_rgba (cr, 0,0,0,0.3 );
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cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
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cairo_set_line_width (cr, pointer_thickness);
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cairo_move_to (cr, (center_radius * value_x), (center_radius * value_y));
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cairo_line_to (cr, ((center_radius*0.4) * value_x), ((center_radius*0.4) * value_y));
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cairo_stroke (cr);
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cairo_restore(cr);
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}
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//line
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cairo_set_source_rgba (cr, 1,1,1, 1 );
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cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
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cairo_set_line_width (cr, pointer_thickness);
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cairo_move_to (cr, (center_radius * value_x), (center_radius * value_y));
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cairo_line_to (cr, ((center_radius*0.4) * value_x), ((center_radius*0.4) * value_y));
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cairo_stroke (cr);
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//highlight if grabbed or if mouse is hovering over me
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if ( _grabbed || (_hovering && ARDOUR::Config->get_widget_prelight() ) ) {
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cairo_set_source_rgba (cr, 1,1,1, 0.12 );
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cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
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cairo_fill (cr);
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}
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cairo_identity_matrix(cr);
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}
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void
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ArdourKnob::on_size_request (Gtk::Requisition* req)
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{
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CairoWidget::on_size_request (req);
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//perhaps render the knob base into a cached image here?
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}
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bool
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ArdourKnob::on_scroll_event (GdkEventScroll* ev)
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{
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/* mouse wheel */
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float scale = 0.05; //by default, we step in 1/20ths of the knob travel
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if (ev->state & Keyboard::GainFineScaleModifier) {
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if (ev->state & Keyboard::GainExtraFineScaleModifier) {
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scale *= 0.01;
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} else {
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scale *= 0.10;
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}
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}
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boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
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if (c) {
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float val = c->get_interface();
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if ( ev->direction == GDK_SCROLL_UP )
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val += scale;
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else
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val -= scale;
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c->set_interface(val);
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}
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return true;
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}
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bool
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ArdourKnob::on_motion_notify_event (GdkEventMotion *ev)
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{
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//scale the adjustment based on keyboard modifiers
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float scale = 0.0025;
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if (ev->state & Keyboard::GainFineScaleModifier) {
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if (ev->state & Keyboard::GainExtraFineScaleModifier) {
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scale *= 0.01;
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} else {
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scale *= 0.10;
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}
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}
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//calculate the travel of the mouse
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int y_delta = 0;
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if (ev->state & Gdk::BUTTON1_MASK) {
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y_delta = _grabbed_y - ev->y;
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_grabbed_y = ev->y;
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if (y_delta == 0) return TRUE;
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}
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//step the value of the controllable
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boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
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if (c) {
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float val = c->get_interface();
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val += y_delta * scale;
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c->set_interface(val);
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}
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return true;
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}
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bool
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ArdourKnob::on_button_press_event (GdkEventButton *ev)
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{
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_grabbed_y = ev->y;
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_grabbed = true;
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set_active_state (Gtkmm2ext::ExplicitActive);
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if (binding_proxy.button_press_handler (ev)) {
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return true;
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}
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return false;
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}
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bool
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ArdourKnob::on_button_release_event (GdkEventButton *ev)
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{
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if ( (_grabbed_y == ev->y) && Keyboard::modifier_state_equals (ev->state, Keyboard::TertiaryModifier)) { //no move, shift-click sets to default
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boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
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if (!c) return false;
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c->set_value (c->normal());
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return true;
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}
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_grabbed = false;
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unset_active_state ();
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return false;
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}
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void
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ArdourKnob::color_handler ()
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{
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set_dirty ();
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}
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void
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ArdourKnob::on_size_allocate (Allocation& alloc)
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{
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CairoWidget::on_size_allocate (alloc);
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}
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void
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ArdourKnob::set_controllable (boost::shared_ptr<Controllable> c)
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{
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watch_connection.disconnect (); //stop watching the old controllable
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if (!c) return;
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binding_proxy.set_controllable (c);
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c->Changed.connect (watch_connection, invalidator(*this), boost::bind (&ArdourKnob::controllable_changed, this), gui_context());
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controllable_changed();
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}
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void
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ArdourKnob::controllable_changed ()
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{
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_val = binding_proxy.get_controllable()->get_interface(); //% of knob travel
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_val = min( max(0.0f, _val), 1.0f); //range check
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set_dirty();
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}
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void
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ArdourKnob::on_style_changed (const RefPtr<Gtk::Style>&)
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{
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set_dirty ();
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}
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void
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ArdourKnob::on_name_changed ()
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{
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set_dirty ();
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}
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void
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ArdourKnob::set_active_state (Gtkmm2ext::ActiveState s)
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{
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if (_active_state != s)
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CairoWidget::set_active_state (s);
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}
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void
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ArdourKnob::set_visual_state (Gtkmm2ext::VisualState s)
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{
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if (_visual_state != s)
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CairoWidget::set_visual_state (s);
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}
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bool
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ArdourKnob::on_focus_in_event (GdkEventFocus* ev)
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{
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set_dirty ();
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return CairoWidget::on_focus_in_event (ev);
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}
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bool
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ArdourKnob::on_focus_out_event (GdkEventFocus* ev)
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{
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set_dirty ();
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return CairoWidget::on_focus_out_event (ev);
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}
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bool
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ArdourKnob::on_enter_notify_event (GdkEventCrossing* ev)
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{
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_hovering = true;
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set_dirty ();
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return CairoWidget::on_enter_notify_event (ev);
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}
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bool
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ArdourKnob::on_leave_notify_event (GdkEventCrossing* ev)
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{
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_hovering = false;
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set_dirty ();
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return CairoWidget::on_leave_notify_event (ev);
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}
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void
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ArdourKnob::set_elements (Element e)
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{
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_elements = e;
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}
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void
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ArdourKnob::add_elements (Element e)
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{
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_elements = (ArdourKnob::Element) (_elements | e);
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}
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