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Diffstat (limited to 'gtk2_ardour/ardour_knob.cc')
| -rw-r--r-- | gtk2_ardour/ardour_knob.cc | 458 |
1 files changed, 458 insertions, 0 deletions
diff --git a/gtk2_ardour/ardour_knob.cc b/gtk2_ardour/ardour_knob.cc new file mode 100644 index 0000000000..a125588db7 --- /dev/null +++ b/gtk2_ardour/ardour_knob.cc @@ -0,0 +1,458 @@ +/* + Copyright (C) 2010 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 <cmath> +#include <algorithm> + +#include <pangomm/layout.h> + +#include "pbd/compose.h" +#include "pbd/error.h" +#include "pbd/stacktrace.h" + +#include "gtkmm2ext/utils.h" +#include "gtkmm2ext/rgb_macros.h" +#include "gtkmm2ext/gui_thread.h" +#include "gtkmm2ext/keyboard.h" + +#include "ardour/rc_configuration.h" // for widget prelight preference + +#include "ardour_knob.h" +#include "ardour_ui.h" +#include "global_signals.h" + +#include "canvas/utils.h" + +#include "i18n.h" + +using namespace Gtkmm2ext; +using namespace Gdk; +using namespace Gtk; +using namespace Glib; +using namespace PBD; +using std::max; +using std::min; +using namespace std; + +ArdourKnob::Element ArdourKnob::default_elements = ArdourKnob::Element (ArdourKnob::Arc); + +ArdourKnob::ArdourKnob (Element e) + : _elements (e) + , _hovering (false) + , _grabbed (false) +{ + ARDOUR_UI_UTILS::ColorsChanged.connect (sigc::mem_fun (*this, &ArdourKnob::color_handler)); +} + +ArdourKnob::~ArdourKnob() +{ +} + +void +ArdourKnob::render (cairo_t* cr, cairo_rectangle_t *) +{ + cairo_pattern_t* shade_pattern; + + float width = get_width(); + float height = get_height(); + + const float scale = min(width, height); + const float pointer_thickness = 3.0 * (scale/80); //(if the knob is 80 pixels wide, we want a 3-pix line on it) + + float start_angle = ((180 - 65) * G_PI) / 180; + float end_angle = ((360 + 65) * G_PI) / 180; + float value_angle = start_angle + (_val * (end_angle - start_angle)); + + float value_x = cos (value_angle); + float value_y = sin (value_angle); + + cairo_set_antialias( cr, CAIRO_ANTIALIAS_BEST ); + + float xc = 0.5 + width/ 2.0; + float yc = 0.5 + height/ 2.0; + + cairo_translate (cr, xc, yc); //after this, everything is based on the center of the knob + + //get the knob color from the theme + ArdourCanvas::Color knob_color = ARDOUR_UI::config()->color_by_name (string_compose ("%1", get_name())); + + float center_radius = 0.48*scale; + + bool arc = (_elements & Arc)==Arc; + bool bevel = (_elements & Bevel)==Bevel; + bool flat = ARDOUR_UI::config()->get_flat_buttons(); + + if ( arc ) { + center_radius = scale*0.25; + + float inner_progress_radius = scale*0.25; + float outer_progress_radius = scale*0.48; + float progress_width = (outer_progress_radius-inner_progress_radius); + float progress_radius = inner_progress_radius + progress_width/2.0; + + float start_angle_x = cos (start_angle); + float start_angle_y = sin (start_angle); + float end_angle_x = cos (end_angle); + float end_angle_y = sin (end_angle); + + //dark arc background + cairo_set_source_rgb (cr, 0.3, 0.3, 0.3 ); + cairo_set_line_width (cr, progress_width); + cairo_arc (cr, 0, 0, progress_radius, start_angle, end_angle); + cairo_stroke (cr); + + //look up the arc colors from the config + double red_start, green_start, blue_start, unused; + ArdourCanvas::Color arc_start_color = ARDOUR_UI::config()->color_by_name ( "processor fader: fill start"); + ArdourCanvas::color_to_rgba( arc_start_color, red_start, green_start, blue_start, unused ); + double red_end, green_end, blue_end; + ArdourCanvas::Color arc_end_color = ARDOUR_UI::config()->color_by_name ( "processor fader: fill end" ); + ArdourCanvas::color_to_rgba( arc_end_color, red_end, green_end, blue_end, unused ); + + //vary the arc color over the travel of the knob + float r = (1.0-_val) * red_end + _val * red_start; + float g = (1.0-_val) * green_end + _val * green_start; + float b = (1.0-_val) * blue_end + _val * blue_start; + + //draw the arc + cairo_set_source_rgb (cr, r,g,b); + cairo_set_line_width (cr, progress_width); + cairo_arc (cr, 0, 0, progress_radius, start_angle, value_angle); + cairo_stroke (cr); + + //shade the arc + if (!flat) { + shade_pattern = cairo_pattern_create_linear (0.0, -yc, 0.0, yc); //note we have to offset the pattern from our centerpoint + cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.15); + cairo_pattern_add_color_stop_rgba (shade_pattern, 0.5, 1,1,1, 0.0); + cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 1,1,1, 0.0); + cairo_set_source (cr, shade_pattern); + cairo_arc (cr, 0, 0, outer_progress_radius-1, 0, 2.0*G_PI); + cairo_fill (cr); + cairo_pattern_destroy (shade_pattern); + } + + //black border + cairo_set_source_rgb (cr, 0, 0, 0 ); + cairo_set_line_width (cr, 1.0); + cairo_move_to (cr, (outer_progress_radius * start_angle_x), (outer_progress_radius * start_angle_y)); + cairo_line_to (cr, (inner_progress_radius * start_angle_x), (inner_progress_radius * start_angle_y)); + cairo_stroke (cr); + cairo_move_to (cr, (outer_progress_radius * end_angle_x), (outer_progress_radius * end_angle_y)); + cairo_line_to (cr, (inner_progress_radius * end_angle_x), (inner_progress_radius * end_angle_y)); + cairo_stroke (cr); + cairo_arc (cr, 0, 0, outer_progress_radius, start_angle, end_angle); + cairo_stroke (cr); + } + + if (!flat) { + //knob shadow + cairo_save(cr); + cairo_translate(cr, pointer_thickness+1, pointer_thickness+1 ); + cairo_set_source_rgba (cr, 0, 0, 0, 0.1 ); + cairo_arc (cr, 0, 0, center_radius-1, 0, 2.0*G_PI); + cairo_fill (cr); + cairo_restore(cr); + + //black border + cairo_set_source_rgb (cr, 0, 0, 0 ); + cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI); + cairo_stroke (cr); + + //inner circle + ArdourCanvas::set_source_rgba(cr, knob_color); + cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI); + cairo_fill (cr); + + //gradient + if (bevel) { + //knob gradient + shade_pattern = cairo_pattern_create_linear (0.0, -yc, 0.0, yc); //note we have to offset the gradient from our centerpoint + cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.2); + cairo_pattern_add_color_stop_rgba (shade_pattern, 0.2, 1,1,1, 0.2); + cairo_pattern_add_color_stop_rgba (shade_pattern, 0.8, 0,0,0, 0.2); + cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 0,0,0, 0.2); + cairo_set_source (cr, shade_pattern); + cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI); + cairo_fill (cr); + cairo_pattern_destroy (shade_pattern); + + //flat top over beveled edge + ArdourCanvas::set_source_rgb_a (cr, knob_color, 0.5 ); + cairo_arc (cr, 0, 0, center_radius-pointer_thickness, 0, 2.0*G_PI); + cairo_fill (cr); + } else { + //radial gradient + 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 + cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.2); + cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 0,0,0, 0.3); + cairo_set_source (cr, shade_pattern); + cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI); + cairo_fill (cr); + cairo_pattern_destroy (shade_pattern); + } + + } else { + //inner circle + ArdourCanvas::set_source_rgba(cr, knob_color); + cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI); + cairo_fill (cr); + } + + + //black knob border + cairo_set_line_width (cr, 1); + cairo_set_source_rgba (cr, 0,0,0, 1 ); + cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI); + cairo_stroke (cr); + + //line shadow + if (!flat) { + cairo_save(cr); + cairo_translate(cr, 2, 2 ); + cairo_set_source_rgba (cr, 0,0,0,0.5 ); + cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND); + cairo_set_line_width (cr, pointer_thickness); + cairo_move_to (cr, (center_radius * value_x), (center_radius * value_y)); + cairo_line_to (cr, ((center_radius*0.4) * value_x), ((center_radius*0.4) * value_y)); + cairo_stroke (cr); + cairo_restore(cr); + } + + //line + cairo_set_source_rgba (cr, 1,1,1, 1 ); + cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND); + cairo_set_line_width (cr, pointer_thickness); + cairo_move_to (cr, (center_radius * value_x), (center_radius * value_y)); + cairo_line_to (cr, ((center_radius*0.4) * value_x), ((center_radius*0.4) * value_y)); + cairo_stroke (cr); + + //highlight if grabbed or if mouse is hovering over me + if ( _grabbed || (_hovering && ARDOUR::Config->get_widget_prelight() ) ) { + cairo_set_source_rgba (cr, 1,1,1, 0.12 ); + cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI); + cairo_fill (cr); + } + + cairo_identity_matrix(cr); +} + +void +ArdourKnob::on_size_request (Gtk::Requisition* req) +{ + CairoWidget::on_size_request (req); + + //perhaps render the knob base into a cached image here? +} + +bool +ArdourKnob::on_scroll_event (GdkEventScroll* ev) +{ + /* mouse wheel */ + + float scale = 0.05; //by default, we step in 1/20ths of the knob travel + if (ev->state & Keyboard::GainFineScaleModifier) { + if (ev->state & Keyboard::GainExtraFineScaleModifier) { + scale *= 0.01; + } else { + scale *= 0.10; + } + } + + boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable(); + if (c) { + float val = c->get_interface(); + + if ( ev->direction == GDK_SCROLL_UP ) + val += scale; + else + val -= scale; + + c->set_interface(val); + } + + return true; +} + +bool +ArdourKnob::on_motion_notify_event (GdkEventMotion *ev) +{ + //scale the adjustment based on keyboard modifiers + float scale = 0.0025; + if (ev->state & Keyboard::GainFineScaleModifier) { + if (ev->state & Keyboard::GainExtraFineScaleModifier) { + scale *= 0.01; + } else { + scale *= 0.10; + } + } + + //calculate the travel of the mouse + int y_delta = 0; + if (ev->state & Gdk::BUTTON1_MASK) { + y_delta = _grabbed_y - ev->y; + _grabbed_y = ev->y; + if (y_delta == 0) return TRUE; + } + + //step the value of the controllable + boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable(); + if (c) { + float val = c->get_interface(); + val += y_delta * scale; + c->set_interface(val); + } + + return true; +} + +bool +ArdourKnob::on_button_press_event (GdkEventButton *ev) +{ + _grabbed_y = ev->y; + _grabbed = true; + + set_active_state (Gtkmm2ext::ExplicitActive); + + if (binding_proxy.button_press_handler (ev)) { + return true; + } + + return false; +} + +bool +ArdourKnob::on_button_release_event (GdkEventButton *ev) +{ + _grabbed = false; + unset_active_state (); + + return false; +} + +void +ArdourKnob::color_handler () +{ + set_dirty (); +} + +void +ArdourKnob::on_size_allocate (Allocation& alloc) +{ + CairoWidget::on_size_allocate (alloc); +} + +void +ArdourKnob::set_controllable (boost::shared_ptr<Controllable> c) +{ + watch_connection.disconnect (); //stop watching the old controllable + + if (!c) return; + + binding_proxy.set_controllable (c); + + c->Changed.connect (watch_connection, invalidator(*this), boost::bind (&ArdourKnob::controllable_changed, this), gui_context()); + + controllable_changed(); +} + +void +ArdourKnob::controllable_changed () +{ + _val = binding_proxy.get_controllable()->get_interface(); //% of knob travel + + _val = min( max(0.0f, _val), 1.0f); //range check + + set_dirty(); +} + +void +ArdourKnob::on_style_changed (const RefPtr<Gtk::Style>&) +{ + set_dirty (); +} + +void +ArdourKnob::on_name_changed () +{ + set_dirty (); +} + + +void +ArdourKnob::set_active_state (Gtkmm2ext::ActiveState s) +{ + if (_active_state != s) + CairoWidget::set_active_state (s); +} + +void +ArdourKnob::set_visual_state (Gtkmm2ext::VisualState s) +{ + if (_visual_state != s) + CairoWidget::set_visual_state (s); +} + + +bool +ArdourKnob::on_focus_in_event (GdkEventFocus* ev) +{ + set_dirty (); + return CairoWidget::on_focus_in_event (ev); +} + +bool +ArdourKnob::on_focus_out_event (GdkEventFocus* ev) +{ + set_dirty (); + return CairoWidget::on_focus_out_event (ev); +} + +bool +ArdourKnob::on_enter_notify_event (GdkEventCrossing* ev) +{ + _hovering = true; + + set_dirty (); + + return CairoWidget::on_enter_notify_event (ev); +} + +bool +ArdourKnob::on_leave_notify_event (GdkEventCrossing* ev) +{ + _hovering = false; + + set_dirty (); + + return CairoWidget::on_leave_notify_event (ev); +} + +void +ArdourKnob::set_elements (Element e) +{ + _elements = e; +} + +void +ArdourKnob::add_elements (Element e) +{ + _elements = (ArdourKnob::Element) (_elements | e); +} |