2 Copyright (C) 2010 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <pangomm/layout.h>
26 #include "pbd/compose.h"
27 #include "pbd/error.h"
28 #include "pbd/stacktrace.h"
30 #include "gtkmm2ext/utils.h"
31 #include "gtkmm2ext/rgb_macros.h"
32 #include "gtkmm2ext/gui_thread.h"
33 #include "gtkmm2ext/keyboard.h"
35 #include "ardour/rc_configuration.h" // for widget prelight preference
37 #include "ardour_knob.h"
38 #include "ardour_ui.h"
39 #include "global_signals.h"
41 #include "canvas/colors.h"
42 #include "canvas/utils.h"
46 using namespace Gtkmm2ext;
55 ArdourKnob::Element ArdourKnob::default_elements = ArdourKnob::Element (ArdourKnob::Arc);
57 ArdourKnob::ArdourKnob (Element e, bool arc_to_zero)
64 , _arc_to_zero (arc_to_zero)
67 ARDOUR_UI_UTILS::ColorsChanged.connect (sigc::mem_fun (*this, &ArdourKnob::color_handler));
70 ArdourKnob::~ArdourKnob()
75 ArdourKnob::render (cairo_t* cr, cairo_rectangle_t *)
77 cairo_pattern_t* shade_pattern;
79 float width = get_width();
80 float height = get_height();
82 const float scale = min(width, height);
83 const float pointer_thickness = 3.0 * (scale/80); //(if the knob is 80 pixels wide, we want a 3-pix line on it)
85 const float start_angle = ((180 - 65) * G_PI) / 180;
86 const float end_angle = ((360 + 65) * G_PI) / 180;
88 const float value_angle = start_angle + (_val * (end_angle - start_angle));
89 const float zero_angle = start_angle + (_zero * (end_angle - start_angle));
91 float value_x = cos (value_angle);
92 float value_y = sin (value_angle);
94 float xc = 0.5 + width/ 2.0;
95 float yc = 0.5 + height/ 2.0;
97 cairo_translate (cr, xc, yc); //after this, everything is based on the center of the knob
99 //get the knob color from the theme
100 ArdourCanvas::Color knob_color = ARDOUR_UI::config()->color (string_compose ("%1", get_name()));
102 float center_radius = 0.48*scale;
103 float border_width = 0.8;
105 bool arc = (_elements & Arc)==Arc;
106 bool bevel = (_elements & Bevel)==Bevel;
107 bool flat = _flat_buttons;
110 center_radius = scale*0.33;
112 float inner_progress_radius = scale*0.38;
113 float outer_progress_radius = scale*0.48;
114 float progress_width = (outer_progress_radius-inner_progress_radius);
115 float progress_radius = inner_progress_radius + progress_width/2.0;
117 //dark arc background
118 cairo_set_source_rgb (cr, 0.3, 0.3, 0.3 );
119 cairo_set_line_width (cr, progress_width);
120 cairo_arc (cr, 0, 0, progress_radius, start_angle, end_angle);
123 //look up the arc colors from the config
124 double red_start, green_start, blue_start, unused;
125 ArdourCanvas::Color arc_start_color = ARDOUR_UI::config()->color ( string_compose ("%1: arc start", get_name()));
126 ArdourCanvas::color_to_rgba( arc_start_color, red_start, green_start, blue_start, unused );
127 double red_end, green_end, blue_end;
128 ArdourCanvas::Color arc_end_color = ARDOUR_UI::config()->color ( string_compose ("%1: arc end", get_name()) );
129 ArdourCanvas::color_to_rgba( arc_end_color, red_end, green_end, blue_end, unused );
131 //vary the arc color over the travel of the knob
132 float intensity = fabs (_val - _zero) / std::max(_zero, (1.f - _zero));
133 const float intensity_inv = 1.0 - intensity;
134 float r = intensity_inv * red_end + intensity * red_start;
135 float g = intensity_inv * green_end + intensity * green_start;
136 float b = intensity_inv * blue_end + intensity * blue_start;
139 cairo_set_source_rgb (cr, r,g,b);
140 cairo_set_line_width (cr, progress_width);
141 if (zero_angle > value_angle) {
142 cairo_arc (cr, 0, 0, progress_radius, value_angle, zero_angle);
144 cairo_arc (cr, 0, 0, progress_radius, zero_angle, value_angle);
150 shade_pattern = cairo_pattern_create_linear (0.0, -yc, 0.0, yc); //note we have to offset the pattern from our centerpoint
151 cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.15);
152 cairo_pattern_add_color_stop_rgba (shade_pattern, 0.5, 1,1,1, 0.0);
153 cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 1,1,1, 0.0);
154 cairo_set_source (cr, shade_pattern);
155 cairo_arc (cr, 0, 0, outer_progress_radius-1, 0, 2.0*G_PI);
157 cairo_pattern_destroy (shade_pattern);
161 const float start_angle_x = cos (start_angle);
162 const float start_angle_y = sin (start_angle);
163 const float end_angle_x = cos (end_angle);
164 const float end_angle_y = sin (end_angle);
166 cairo_set_source_rgb (cr, 0, 0, 0 );
167 cairo_set_line_width (cr, border_width);
168 cairo_move_to (cr, (outer_progress_radius * start_angle_x), (outer_progress_radius * start_angle_y));
169 cairo_line_to (cr, (inner_progress_radius * start_angle_x), (inner_progress_radius * start_angle_y));
171 cairo_move_to (cr, (outer_progress_radius * end_angle_x), (outer_progress_radius * end_angle_y));
172 cairo_line_to (cr, (inner_progress_radius * end_angle_x), (inner_progress_radius * end_angle_y));
174 cairo_arc (cr, 0, 0, outer_progress_radius, start_angle, end_angle);
182 cairo_translate(cr, pointer_thickness+1, pointer_thickness+1 );
183 cairo_set_source_rgba (cr, 0, 0, 0, 0.1 );
184 cairo_arc (cr, 0, 0, center_radius-1, 0, 2.0*G_PI);
189 ArdourCanvas::set_source_rgba(cr, knob_color);
190 cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
196 shade_pattern = cairo_pattern_create_linear (0.0, -yc, 0.0, yc); //note we have to offset the gradient from our centerpoint
197 cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.2);
198 cairo_pattern_add_color_stop_rgba (shade_pattern, 0.2, 1,1,1, 0.2);
199 cairo_pattern_add_color_stop_rgba (shade_pattern, 0.8, 0,0,0, 0.2);
200 cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 0,0,0, 0.2);
201 cairo_set_source (cr, shade_pattern);
202 cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
204 cairo_pattern_destroy (shade_pattern);
206 //flat top over beveled edge
207 ArdourCanvas::set_source_rgb_a (cr, knob_color, 0.5 );
208 cairo_arc (cr, 0, 0, center_radius-pointer_thickness, 0, 2.0*G_PI);
212 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
213 cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.2);
214 cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 0,0,0, 0.3);
215 cairo_set_source (cr, shade_pattern);
216 cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
218 cairo_pattern_destroy (shade_pattern);
223 ArdourCanvas::set_source_rgba(cr, knob_color);
224 cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
230 cairo_set_line_width (cr, border_width);
231 cairo_set_source_rgba (cr, 0,0,0, 1 );
232 cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
238 cairo_translate(cr, 1, 1 );
239 cairo_set_source_rgba (cr, 0,0,0,0.3 );
240 cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
241 cairo_set_line_width (cr, pointer_thickness);
242 cairo_move_to (cr, (center_radius * value_x), (center_radius * value_y));
243 cairo_line_to (cr, ((center_radius*0.4) * value_x), ((center_radius*0.4) * value_y));
249 cairo_set_source_rgba (cr, 1,1,1, 1 );
250 cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
251 cairo_set_line_width (cr, pointer_thickness);
252 cairo_move_to (cr, (center_radius * value_x), (center_radius * value_y));
253 cairo_line_to (cr, ((center_radius*0.4) * value_x), ((center_radius*0.4) * value_y));
256 //highlight if grabbed or if mouse is hovering over me
257 if (_tooltip.dragging() || (_hovering && ARDOUR_UI::config()->get_widget_prelight() ) ) {
258 cairo_set_source_rgba (cr, 1,1,1, 0.12 );
259 cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
263 cairo_identity_matrix(cr);
267 ArdourKnob::on_size_request (Gtk::Requisition* req)
269 // see ardour-button VectorIcon size, use font scaling as default
270 CairoWidget::on_size_request (req); // allow to override
273 if (req->width < req->height) {
274 req->width = req->height;
276 if (req->height < req->width) {
277 req->height = req->width;
282 ArdourKnob::on_scroll_event (GdkEventScroll* ev)
286 float scale = 0.05; //by default, we step in 1/20ths of the knob travel
287 if (ev->state & Keyboard::GainFineScaleModifier) {
288 if (ev->state & Keyboard::GainExtraFineScaleModifier) {
295 boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
297 float val = c->get_interface();
299 if ( ev->direction == GDK_SCROLL_UP )
304 c->set_interface(val);
311 ArdourKnob::on_motion_notify_event (GdkEventMotion *ev)
313 //scale the adjustment based on keyboard modifiers
314 float scale = 0.0025;
315 if (ev->state & Keyboard::GainFineScaleModifier) {
316 if (ev->state & Keyboard::GainExtraFineScaleModifier) {
323 //calculate the travel of the mouse
325 if (ev->state & Gdk::BUTTON1_MASK) {
326 delta = (_grabbed_y - ev->y) - (_grabbed_x - ev->x);
329 if (delta == 0) return TRUE;
332 //step the value of the controllable
333 boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
335 float val = c->get_interface();
336 val += delta * scale;
337 c->set_interface(val);
344 ArdourKnob::on_button_press_event (GdkEventButton *ev)
348 _tooltip.start_drag();
350 set_active_state (Gtkmm2ext::ExplicitActive);
352 if (binding_proxy.button_press_handler (ev)) {
360 ArdourKnob::on_button_release_event (GdkEventButton *ev)
362 if ( (_grabbed_y == ev->y && _grabbed_x == ev->x) && Keyboard::modifier_state_equals (ev->state, Keyboard::TertiaryModifier)) { //no move, shift-click sets to default
363 boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
364 if (!c) return false;
365 c->set_value (c->normal());
369 //_tooltip.target_stop_drag ();
370 _tooltip.stop_drag();
371 unset_active_state ();
377 ArdourKnob::color_handler ()
383 ArdourKnob::on_size_allocate (Allocation& alloc)
385 CairoWidget::on_size_allocate (alloc);
389 ArdourKnob::set_controllable (boost::shared_ptr<Controllable> c)
391 watch_connection.disconnect (); //stop watching the old controllable
395 binding_proxy.set_controllable (c);
397 c->Changed.connect (watch_connection, invalidator(*this), boost::bind (&ArdourKnob::controllable_changed, this), gui_context());
400 _zero = c->internal_to_interface(c->normal());
405 controllable_changed();
409 ArdourKnob::controllable_changed ()
411 boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
413 _val = c->get_interface(); //% of knob travel
414 _val = min( max(0.0f, _val), 1.0f); //range check
416 if (!_tooltip_prefix.empty()) {
417 _tooltip.set_tip (_tooltip_prefix + c->get_user_string());
423 ArdourKnob::on_style_changed (const RefPtr<Gtk::Style>&)
429 ArdourKnob::on_name_changed ()
436 ArdourKnob::set_active_state (Gtkmm2ext::ActiveState s)
438 if (_active_state != s)
439 CairoWidget::set_active_state (s);
443 ArdourKnob::set_visual_state (Gtkmm2ext::VisualState s)
445 if (_visual_state != s)
446 CairoWidget::set_visual_state (s);
451 ArdourKnob::on_focus_in_event (GdkEventFocus* ev)
454 return CairoWidget::on_focus_in_event (ev);
458 ArdourKnob::on_focus_out_event (GdkEventFocus* ev)
461 return CairoWidget::on_focus_out_event (ev);
465 ArdourKnob::on_enter_notify_event (GdkEventCrossing* ev)
471 return CairoWidget::on_enter_notify_event (ev);
475 ArdourKnob::on_leave_notify_event (GdkEventCrossing* ev)
481 return CairoWidget::on_leave_notify_event (ev);
485 ArdourKnob::set_elements (Element e)
491 ArdourKnob::add_elements (Element e)
493 _elements = (ArdourKnob::Element) (_elements | e);
497 KnobPersistentTooltip::KnobPersistentTooltip (Gtk::Widget* w)
498 : PersistentTooltip (w, 3)
504 KnobPersistentTooltip::start_drag ()
511 KnobPersistentTooltip::stop_drag ()
518 KnobPersistentTooltip::dragging () const