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, Flags flags)
64 , _dead_zone_delta (0)
68 ARDOUR_UI_UTILS::ColorsChanged.connect (sigc::mem_fun (*this, &ArdourKnob::color_handler));
71 ArdourKnob::~ArdourKnob()
76 ArdourKnob::render (cairo_t* cr, cairo_rectangle_t *)
78 cairo_pattern_t* shade_pattern;
80 float width = get_width();
81 float height = get_height();
83 const float scale = min(width, height);
84 const float pointer_thickness = 3.0 * (scale/80); //(if the knob is 80 pixels wide, we want a 3-pix line on it)
86 const float start_angle = ((180 - 65) * G_PI) / 180;
87 const float end_angle = ((360 + 65) * G_PI) / 180;
90 if (_flags & ArcToZero) {
94 const float value_angle = start_angle + (_val * (end_angle - start_angle));
95 const float zero_angle = start_angle + (zero * (end_angle - start_angle));
97 float value_x = cos (value_angle);
98 float value_y = sin (value_angle);
100 float xc = 0.5 + width/ 2.0;
101 float yc = 0.5 + height/ 2.0;
103 cairo_translate (cr, xc, yc); //after this, everything is based on the center of the knob
105 //get the knob color from the theme
106 ArdourCanvas::Color knob_color = ARDOUR_UI::config()->color (string_compose ("%1", get_name()));
108 float center_radius = 0.48*scale;
109 float border_width = 0.8;
111 bool arc = (_elements & Arc)==Arc;
112 bool bevel = (_elements & Bevel)==Bevel;
113 bool flat = _flat_buttons;
116 center_radius = scale*0.33;
118 float inner_progress_radius = scale*0.38;
119 float outer_progress_radius = scale*0.48;
120 float progress_width = (outer_progress_radius-inner_progress_radius);
121 float progress_radius = inner_progress_radius + progress_width/2.0;
123 //dark arc background
124 cairo_set_source_rgb (cr, 0.3, 0.3, 0.3 );
125 cairo_set_line_width (cr, progress_width);
126 cairo_arc (cr, 0, 0, progress_radius, start_angle, end_angle);
129 //look up the arc colors from the config
130 double red_start, green_start, blue_start, unused;
131 ArdourCanvas::Color arc_start_color = ARDOUR_UI::config()->color ( string_compose ("%1: arc start", get_name()));
132 ArdourCanvas::color_to_rgba( arc_start_color, red_start, green_start, blue_start, unused );
133 double red_end, green_end, blue_end;
134 ArdourCanvas::Color arc_end_color = ARDOUR_UI::config()->color ( string_compose ("%1: arc end", get_name()) );
135 ArdourCanvas::color_to_rgba( arc_end_color, red_end, green_end, blue_end, unused );
137 //vary the arc color over the travel of the knob
138 float intensity = fabsf (_val - zero) / std::max(zero, (1.f - zero));
139 const float intensity_inv = 1.0 - intensity;
140 float r = intensity_inv * red_end + intensity * red_start;
141 float g = intensity_inv * green_end + intensity * green_start;
142 float b = intensity_inv * blue_end + intensity * blue_start;
145 cairo_set_source_rgb (cr, r,g,b);
146 cairo_set_line_width (cr, progress_width);
147 if (zero_angle > value_angle) {
148 cairo_arc (cr, 0, 0, progress_radius, value_angle, zero_angle);
150 cairo_arc (cr, 0, 0, progress_radius, zero_angle, value_angle);
156 shade_pattern = cairo_pattern_create_linear (0.0, -yc, 0.0, yc); //note we have to offset the pattern from our centerpoint
157 cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.15);
158 cairo_pattern_add_color_stop_rgba (shade_pattern, 0.5, 1,1,1, 0.0);
159 cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 1,1,1, 0.0);
160 cairo_set_source (cr, shade_pattern);
161 cairo_arc (cr, 0, 0, outer_progress_radius-1, 0, 2.0*G_PI);
163 cairo_pattern_destroy (shade_pattern);
167 const float start_angle_x = cos (start_angle);
168 const float start_angle_y = sin (start_angle);
169 const float end_angle_x = cos (end_angle);
170 const float end_angle_y = sin (end_angle);
172 cairo_set_source_rgb (cr, 0, 0, 0 );
173 cairo_set_line_width (cr, border_width);
174 cairo_move_to (cr, (outer_progress_radius * start_angle_x), (outer_progress_radius * start_angle_y));
175 cairo_line_to (cr, (inner_progress_radius * start_angle_x), (inner_progress_radius * start_angle_y));
177 cairo_move_to (cr, (outer_progress_radius * end_angle_x), (outer_progress_radius * end_angle_y));
178 cairo_line_to (cr, (inner_progress_radius * end_angle_x), (inner_progress_radius * end_angle_y));
180 cairo_arc (cr, 0, 0, outer_progress_radius, start_angle, end_angle);
188 cairo_translate(cr, pointer_thickness+1, pointer_thickness+1 );
189 cairo_set_source_rgba (cr, 0, 0, 0, 0.1 );
190 cairo_arc (cr, 0, 0, center_radius-1, 0, 2.0*G_PI);
195 ArdourCanvas::set_source_rgba(cr, knob_color);
196 cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
202 shade_pattern = cairo_pattern_create_linear (0.0, -yc, 0.0, yc); //note we have to offset the gradient from our centerpoint
203 cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.2);
204 cairo_pattern_add_color_stop_rgba (shade_pattern, 0.2, 1,1,1, 0.2);
205 cairo_pattern_add_color_stop_rgba (shade_pattern, 0.8, 0,0,0, 0.2);
206 cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 0,0,0, 0.2);
207 cairo_set_source (cr, shade_pattern);
208 cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
210 cairo_pattern_destroy (shade_pattern);
212 //flat top over beveled edge
213 ArdourCanvas::set_source_rgb_a (cr, knob_color, 0.5 );
214 cairo_arc (cr, 0, 0, center_radius-pointer_thickness, 0, 2.0*G_PI);
218 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
219 cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.2);
220 cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 0,0,0, 0.3);
221 cairo_set_source (cr, shade_pattern);
222 cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
224 cairo_pattern_destroy (shade_pattern);
229 ArdourCanvas::set_source_rgba(cr, knob_color);
230 cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
236 cairo_set_line_width (cr, border_width);
237 cairo_set_source_rgba (cr, 0,0,0, 1 );
238 cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
244 cairo_translate(cr, 1, 1 );
245 cairo_set_source_rgba (cr, 0,0,0,0.3 );
246 cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
247 cairo_set_line_width (cr, pointer_thickness);
248 cairo_move_to (cr, (center_radius * value_x), (center_radius * value_y));
249 cairo_line_to (cr, ((center_radius*0.4) * value_x), ((center_radius*0.4) * value_y));
255 cairo_set_source_rgba (cr, 1,1,1, 1 );
256 cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
257 cairo_set_line_width (cr, pointer_thickness);
258 cairo_move_to (cr, (center_radius * value_x), (center_radius * value_y));
259 cairo_line_to (cr, ((center_radius*0.4) * value_x), ((center_radius*0.4) * value_y));
262 //highlight if grabbed or if mouse is hovering over me
263 if (_tooltip.dragging() || (_hovering && ARDOUR_UI::config()->get_widget_prelight() ) ) {
264 cairo_set_source_rgba (cr, 1,1,1, 0.12 );
265 cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
269 cairo_identity_matrix(cr);
273 ArdourKnob::on_size_request (Gtk::Requisition* req)
275 // see ardour-button VectorIcon size, use font scaling as default
276 CairoWidget::on_size_request (req); // allow to override
279 if (req->width < req->height) {
280 req->width = req->height;
282 if (req->height < req->width) {
283 req->height = req->width;
288 ArdourKnob::on_scroll_event (GdkEventScroll* ev)
292 float scale = 0.05; //by default, we step in 1/20ths of the knob travel
293 if (ev->state & Keyboard::GainFineScaleModifier) {
294 if (ev->state & Keyboard::GainExtraFineScaleModifier) {
301 boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
303 float val = c->get_interface();
305 if ( ev->direction == GDK_SCROLL_UP )
310 c->set_interface(val);
317 ArdourKnob::on_motion_notify_event (GdkEventMotion *ev)
319 if (!(ev->state & Gdk::BUTTON1_MASK)) {
323 boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
329 //scale the adjustment based on keyboard modifiers & GUI size
330 const float ui_scale = max (1.f, ARDOUR_UI::ui_scale);
331 float scale = 0.0025 / ui_scale;
333 if (ev->state & Keyboard::GainFineScaleModifier) {
334 if (ev->state & Keyboard::GainExtraFineScaleModifier) {
341 //calculate the travel of the mouse
342 int delta = (_grabbed_y - ev->y) - (_grabbed_x - ev->x);
349 float val = c->get_interface();
351 if (_flags & Detent) {
352 const float px_deadzone = 42.f * ui_scale;
354 if ((val - _normal) * (val - _normal + delta * scale) < 0) {
356 const int tozero = (_normal - val) * scale;
357 int remain = delta - tozero;
358 if (abs (remain) > px_deadzone) {
359 /* slow down passing the default value */
360 remain += (remain > 0) ? px_deadzone * -.5 : px_deadzone * .5;
361 delta = tozero + remain;
362 _dead_zone_delta = 0;
364 c->set_interface(_normal);
366 _dead_zone_delta = remain / px_deadzone;
371 if (fabsf (rintf((val - _normal) / scale) + _dead_zone_delta) < 1) {
372 c->set_interface(_normal);
373 _dead_zone_delta += delta / px_deadzone;
377 _dead_zone_delta = 0;
380 val += delta * scale;
381 c->set_interface(val);
387 ArdourKnob::on_button_press_event (GdkEventButton *ev)
391 _dead_zone_delta = 0;
393 if (ev->type != GDK_BUTTON_PRESS) {
396 gdk_pointer_ungrab (GDK_CURRENT_TIME);
401 if (binding_proxy.button_press_handler (ev)) {
405 if (ev->button != 1 && ev->button != 2) {
409 set_active_state (Gtkmm2ext::ExplicitActive);
410 _tooltip.start_drag();
413 gdk_pointer_grab(ev->window,false,
414 GdkEventMask( Gdk::POINTER_MOTION_MASK | Gdk::BUTTON_PRESS_MASK |Gdk::BUTTON_RELEASE_MASK),
420 ArdourKnob::on_button_release_event (GdkEventButton *ev)
422 _tooltip.stop_drag();
425 gdk_pointer_ungrab (GDK_CURRENT_TIME);
427 if ( (_grabbed_y == ev->y && _grabbed_x == ev->x) && Keyboard::modifier_state_equals (ev->state, Keyboard::TertiaryModifier)) { //no move, shift-click sets to default
428 boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
429 if (!c) return false;
430 c->set_value (c->normal());
434 unset_active_state ();
440 ArdourKnob::color_handler ()
446 ArdourKnob::on_size_allocate (Allocation& alloc)
448 CairoWidget::on_size_allocate (alloc);
452 ArdourKnob::set_controllable (boost::shared_ptr<Controllable> c)
454 watch_connection.disconnect (); //stop watching the old controllable
458 binding_proxy.set_controllable (c);
460 c->Changed.connect (watch_connection, invalidator(*this), boost::bind (&ArdourKnob::controllable_changed, this), gui_context());
462 _normal = c->internal_to_interface(c->normal());
464 controllable_changed();
468 ArdourKnob::controllable_changed ()
470 boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
472 _val = c->get_interface(); //% of knob travel
473 _val = min( max(0.0f, _val), 1.0f); //range check
475 if (!_tooltip_prefix.empty()) {
476 _tooltip.set_tip (_tooltip_prefix + c->get_user_string());
482 ArdourKnob::on_style_changed (const RefPtr<Gtk::Style>&)
488 ArdourKnob::on_name_changed ()
495 ArdourKnob::set_active_state (Gtkmm2ext::ActiveState s)
497 if (_active_state != s)
498 CairoWidget::set_active_state (s);
502 ArdourKnob::set_visual_state (Gtkmm2ext::VisualState s)
504 if (_visual_state != s)
505 CairoWidget::set_visual_state (s);
510 ArdourKnob::on_focus_in_event (GdkEventFocus* ev)
513 return CairoWidget::on_focus_in_event (ev);
517 ArdourKnob::on_focus_out_event (GdkEventFocus* ev)
520 return CairoWidget::on_focus_out_event (ev);
524 ArdourKnob::on_enter_notify_event (GdkEventCrossing* ev)
530 return CairoWidget::on_enter_notify_event (ev);
534 ArdourKnob::on_leave_notify_event (GdkEventCrossing* ev)
540 return CairoWidget::on_leave_notify_event (ev);
544 ArdourKnob::set_elements (Element e)
550 ArdourKnob::add_elements (Element e)
552 _elements = (ArdourKnob::Element) (_elements | e);
556 KnobPersistentTooltip::KnobPersistentTooltip (Gtk::Widget* w)
557 : PersistentTooltip (w, 3)
563 KnobPersistentTooltip::start_drag ()
569 KnobPersistentTooltip::stop_drag ()
575 KnobPersistentTooltip::dragging () const