2 Copyright (C) 2006 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.
18 $Id: fastmeter.h 570 2006-06-07 21:21:21Z sampo $
25 #include "pbd/stacktrace.h"
27 #include "gtkmm2ext/cairo_widget.h"
28 #include "gtkmm2ext/keyboard.h"
29 #include "gtkmm2ext/pixfader.h"
30 #include "gtkmm2ext/utils.h"
32 using namespace Gtkmm2ext;
36 #define CORNER_RADIUS 4
38 #define CORNER_OFFSET 1
39 #define FADER_RESERVE 5
41 std::list<PixFader::FaderImage*> PixFader::_patterns;
43 PixFader::PixFader (Gtk::Adjustment& adj, int orientation, int fader_length, int fader_girth)
45 , _span (fader_length)
46 , _girth (fader_girth)
47 , _orien (orientation)
52 , _centered_text (true)
55 _default_value = adjustment.get_value();
56 update_unity_position ();
59 Gdk::BUTTON_PRESS_MASK
60 | Gdk::BUTTON_RELEASE_MASK
61 | Gdk::POINTER_MOTION_MASK
63 | Gdk::ENTER_NOTIFY_MASK
64 | Gdk::LEAVE_NOTIFY_MASK
67 adjustment.signal_value_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
68 adjustment.signal_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
71 DrawingArea::set_size_request(_girth, _span);
73 DrawingArea::set_size_request(_span, _girth);
77 PixFader::~PixFader ()
79 if (_parent_style_change) _parent_style_change.disconnect();
80 if (_layout) _layout.clear (); // drop reference to existing layout
84 PixFader::find_pattern (double afr, double afg, double afb,
85 double abr, double abg, double abb,
88 for (list<FaderImage*>::iterator f = _patterns.begin(); f != _patterns.end(); ++f) {
89 if ((*f)->matches (afr, afg, afb, abr, abg, abb, w, h)) {
97 PixFader::create_patterns ()
99 Gdk::Color c = get_style()->get_fg (get_state());
104 fg = c.get_green_p ();
105 fb = c.get_blue_p ();
107 c = get_style()->get_bg (get_state());
110 bg = c.get_green_p ();
111 bb = c.get_blue_p ();
113 cairo_surface_t* surface;
116 if (get_width() <= 1 || get_height() <= 1) {
120 if ((_pattern = find_pattern (fr, fg, fb, br, bg, bb, get_width(), get_height())) != 0) {
121 /* found it - use it */
125 if (_orien == VERT) {
127 surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, get_width(), get_height() * 2.0);
128 tc = cairo_create (surface);
130 /* paint background + border */
132 cairo_pattern_t* shade_pattern = cairo_pattern_create_linear (0.0, 0.0, get_width(), 0);
133 cairo_pattern_add_color_stop_rgba (shade_pattern, 0, br*0.8,bg*0.8,bb*0.8, 1.0);
134 cairo_pattern_add_color_stop_rgba (shade_pattern, 1, br*0.6,bg*0.6,bb*0.6, 1.0);
135 cairo_set_source (tc, shade_pattern);
136 cairo_rectangle (tc, 0, 0, get_width(), get_height() * 2.0);
139 cairo_pattern_destroy (shade_pattern);
141 /* paint lower shade */
143 shade_pattern = cairo_pattern_create_linear (0.0, 0.0, get_width() - 2 - CORNER_OFFSET , 0);
144 cairo_pattern_add_color_stop_rgba (shade_pattern, 0, fr*0.8,fg*0.8,fb*0.8, 1.0);
145 cairo_pattern_add_color_stop_rgba (shade_pattern, 1, fr*0.6,fg*0.6,fb*0.6, 1.0);
146 cairo_set_source (tc, shade_pattern);
147 Gtkmm2ext::rounded_top_half_rectangle (tc, CORNER_OFFSET, get_height() + CORNER_OFFSET,
148 get_width() - CORNER_SIZE, get_height(), CORNER_RADIUS);
151 cairo_pattern_destroy (shade_pattern);
153 _pattern = cairo_pattern_create_for_surface (surface);
157 surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, get_width() * 2.0, get_height());
158 tc = cairo_create (surface);
160 /* paint right shade (background section)*/
162 cairo_pattern_t* shade_pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, get_height());
163 cairo_pattern_add_color_stop_rgba (shade_pattern, 0, br*0.8,bg*0.8,bb*0.8, 1.0);
164 cairo_pattern_add_color_stop_rgba (shade_pattern, 1, br*0.6,bg*0.6,bb*0.6, 1.0);
165 cairo_set_source (tc, shade_pattern);
166 cairo_rectangle (tc, 0, 0, get_width() * 2.0, get_height());
169 /* paint left shade (active section/foreground) */
171 shade_pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, get_height());
172 cairo_pattern_add_color_stop_rgba (shade_pattern, 0, fr*0.8,fg*0.8,fb*0.8, 1.0);
173 cairo_pattern_add_color_stop_rgba (shade_pattern, 1, fr*0.6,fg*0.6,fb*0.6, 1.0);
174 cairo_set_source (tc, shade_pattern);
175 Gtkmm2ext::rounded_right_half_rectangle (tc, CORNER_OFFSET, CORNER_OFFSET,
176 get_width() - CORNER_OFFSET, get_height() - CORNER_SIZE, CORNER_RADIUS);
178 cairo_pattern_destroy (shade_pattern);
180 _pattern = cairo_pattern_create_for_surface (surface);
183 /* cache it for others to use */
185 _patterns.push_back (new FaderImage (_pattern, fr, fg, fb, br, bg, bb, get_width(), get_height()));
188 cairo_surface_destroy (surface);
192 PixFader::on_expose_event (GdkEventExpose* ev)
194 Cairo::RefPtr<Cairo::Context> context = get_window()->create_cairo_context();
195 cairo_t* cr = context->cobj();
197 // clip to expose area
198 cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
206 /* this isn't supposed to be happen, but some wackiness whereby
207 * the pixfader ends up with a 1xN or Nx1 size allocation
208 * leads to it. the basic wackiness needs fixing but we
209 * shouldn't crash. just fill in the expose area with
213 CairoWidget::set_source_rgb_a (cr, get_style()->get_bg (get_state()), 1);
214 cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
220 int ds = display_span ();
221 const float w = get_width();
222 const float h = get_height();
224 CairoWidget::set_source_rgb_a (cr, get_parent_bg(), 1);
225 cairo_rectangle (cr, 0, 0, w, h);
228 cairo_set_line_width (cr, 1);
229 cairo_set_source_rgba (cr, 0, 0, 0, 1.0);
231 cairo_matrix_t matrix;
232 Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, CORNER_OFFSET, w-CORNER_SIZE, h-CORNER_SIZE, CORNER_RADIUS);
233 // we use a 'trick' here: The stoke is off by .5px but filling the interiour area
234 // results in an outline of 0.5 px the actual outline is exatly 1px at 50% alpha.
235 cairo_stroke_preserve(cr);
237 if (_orien == VERT) {
239 if (ds > h - FADER_RESERVE - CORNER_OFFSET) {
240 ds = h - FADER_RESERVE - CORNER_OFFSET;
243 if (!CairoWidget::flat_buttons() ) {
244 cairo_set_source (cr, _pattern);
245 cairo_matrix_init_translate (&matrix, 0, (h - ds));
246 cairo_pattern_set_matrix (_pattern, &matrix);
248 CairoWidget::set_source_rgb_a (cr, get_style()->get_bg (get_state()), 1);
250 CairoWidget::set_source_rgb_a (cr, get_style()->get_fg (get_state()), 1);
251 Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, ds + CORNER_OFFSET,
252 w - CORNER_SIZE, h - ds - CORNER_SIZE, CORNER_RADIUS);
258 if (ds < FADER_RESERVE) {
264 * if ds == w, the pattern does not need to be translated
265 * if ds == 0 (or FADER_RESERVE), the pattern needs to be moved
266 * w to the left, which is -w in pattern space, and w in user space
267 * if ds == 10, then the pattern needs to be moved w - 10
268 * to the left, which is -(w-10) in pattern space, which
269 * is (w - 10) in user space
270 * thus: translation = (w - ds)
273 if (!CairoWidget::flat_buttons() ) {
274 cairo_set_source (cr, _pattern);
275 cairo_matrix_init_translate (&matrix, w - ds, 0);
276 cairo_pattern_set_matrix (_pattern, &matrix);
278 CairoWidget::set_source_rgb_a (cr, get_style()->get_bg (get_state()), 1);
280 CairoWidget::set_source_rgb_a (cr, get_style()->get_fg (get_state()), 1);
281 Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, CORNER_OFFSET,
282 ds - CORNER_OFFSET, h - CORNER_SIZE, CORNER_RADIUS);
287 /* draw the unity-position line if it's not at either end*/
288 if (_unity_loc > 0) {
289 context->set_line_width (1);
290 context->set_line_cap (Cairo::LINE_CAP_ROUND);
291 Gdk::Color c = get_style()->get_fg (Gtk::STATE_ACTIVE);
292 context->set_source_rgba (c.get_red_p()*1.5, c.get_green_p()*1.5, c.get_blue_p()*1.5, 0.85);
293 if ( _orien == VERT) {
294 if (_unity_loc < h ) {
295 context->move_to (1.5, _unity_loc + CORNER_OFFSET + .5);
296 context->line_to (_girth - 1.5, _unity_loc + CORNER_OFFSET + .5);
300 if ( _unity_loc < w ){
301 context->move_to (_unity_loc - CORNER_OFFSET + .5, 1.5);
302 context->line_to (_unity_loc - CORNER_OFFSET + .5, _girth - 1.5);
308 if (_layout && !_text.empty() && _orien == HORIZ) {
310 if (_centered_text) {
312 cairo_move_to (cr, (w - _text_width)/2.0, h/2.0 - _text_height/2.0);
313 } else if (ds > .5 * w) {
314 cairo_move_to (cr, CORNER_OFFSET + 3, h/2.0 - _text_height/2.0);
315 cairo_set_operator(cr, CAIRO_OPERATOR_XOR);
317 cairo_move_to (cr, w - _text_width - CORNER_OFFSET - 3, h/2.0 - _text_height/2.0);
319 CairoWidget::set_source_rgb_a (cr, get_style()->get_text (get_state()), 1);
320 pango_cairo_show_layout (cr, _layout->gobj());
324 if (!get_sensitive()) {
325 Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, CORNER_OFFSET, w-CORNER_SIZE, h-CORNER_SIZE, CORNER_RADIUS);
326 cairo_set_source_rgba (cr, 0.505, 0.517, 0.525, 0.4);
328 } else if (_hovering) {
329 Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, CORNER_OFFSET, w-CORNER_SIZE, h-CORNER_SIZE, CORNER_RADIUS);
330 cairo_set_source_rgba (cr, 0.905, 0.917, 0.925, 0.1);
340 PixFader::on_size_request (GtkRequisition* req)
342 if (_orien == VERT) {
343 req->width = (_girth ? _girth : -1);
344 req->height = (_span ? _span : -1);
346 req->height = (_girth ? _girth : -1);
347 req->width = (_span ? _span : -1);
352 PixFader::on_size_allocate (Gtk::Allocation& alloc)
354 DrawingArea::on_size_allocate(alloc);
356 if (_orien == VERT) {
357 _girth = alloc.get_width ();
358 _span = alloc.get_height ();
360 _girth = alloc.get_height ();
361 _span = alloc.get_width ();
365 /* recreate patterns in case we've changed size */
369 update_unity_position ();
373 PixFader::on_button_press_event (GdkEventButton* ev)
375 if (ev->type != GDK_BUTTON_PRESS) {
379 gdk_pointer_ungrab (GDK_CURRENT_TIME);
385 if (ev->button != 1 && ev->button != 2) {
391 _grab_loc = (_orien == VERT) ? ev->y : ev->x;
392 _grab_start = (_orien == VERT) ? ev->y : ev->x;
393 _grab_window = ev->window;
395 gdk_pointer_grab(ev->window,false,
396 GdkEventMask( Gdk::POINTER_MOTION_MASK | Gdk::BUTTON_PRESS_MASK |Gdk::BUTTON_RELEASE_MASK),
399 if (ev->button == 2) {
400 set_adjustment_from_event (ev);
407 PixFader::on_button_release_event (GdkEventButton* ev)
409 double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
411 switch (ev->button) {
416 gdk_pointer_ungrab (GDK_CURRENT_TIME);
420 Keyboard::magic_widget_drop_focus();
424 if (ev_pos == _grab_start) {
426 /* no motion - just a click */
428 if (ev->state & Keyboard::TertiaryModifier) {
429 adjustment.set_value (_default_value);
430 } else if (ev->state & Keyboard::GainFineScaleModifier) {
431 adjustment.set_value (adjustment.get_lower());
432 } else if (ev_pos == display_span()) {
433 ; // click on current position, no move.
434 } else if ((_orien == VERT && ev_pos < display_span()) || (_orien == HORIZ && ev_pos > display_span())) {
435 /* above the current display height, remember X Window coords */
436 adjustment.set_value (adjustment.get_value() + adjustment.get_step_increment());
438 adjustment.set_value (adjustment.get_value() - adjustment.get_step_increment());
450 set_adjustment_from_event (ev);
451 gdk_pointer_ungrab (GDK_CURRENT_TIME);
463 PixFader::on_scroll_event (GdkEventScroll* ev)
468 if (ev->state & Keyboard::GainFineScaleModifier) {
469 if (ev->state & Keyboard::GainExtraFineScaleModifier) {
478 if (_orien == VERT) {
480 /* should left/right scroll affect vertical faders ? */
482 switch (ev->direction) {
485 adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
488 case GDK_SCROLL_DOWN:
489 adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
497 /* up/down scrolls should definitely affect horizontal faders
498 because they are so much easier to use
501 switch (ev->direction) {
503 case GDK_SCROLL_RIGHT:
505 adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
508 case GDK_SCROLL_LEFT:
509 case GDK_SCROLL_DOWN:
510 adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
521 PixFader::on_motion_notify_event (GdkEventMotion* ev)
525 double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
527 if (ev->window != _grab_window) {
529 _grab_window = ev->window;
533 if (ev->state & Keyboard::GainFineScaleModifier) {
534 if (ev->state & Keyboard::GainExtraFineScaleModifier) {
541 double const delta = ev_pos - _grab_loc;
544 double fract = (delta / _span);
546 fract = min (1.0, fract);
547 fract = max (-1.0, fract);
549 // X Window is top->bottom for 0..Y
551 if (_orien == VERT) {
555 adjustment.set_value (adjustment.get_value() + scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
562 PixFader::adjustment_changed ()
564 if (display_span() != _last_drawn) {
569 /** @return pixel offset of the current value from the right or bottom of the fader */
571 PixFader::display_span ()
573 float fract = (adjustment.get_value () - adjustment.get_lower()) / ((adjustment.get_upper() - adjustment.get_lower()));
575 if (_orien == VERT) {
576 ds = (int)floor (_span * (1.0 - fract));
578 ds = (int)floor (_span * fract);
585 PixFader::update_unity_position ()
587 if (_orien == VERT) {
588 _unity_loc = (int) rint (_span * (1 - ((_default_value - adjustment.get_lower()) / (adjustment.get_upper() - adjustment.get_lower())))) - 1;
590 _unity_loc = (int) rint ((_default_value - adjustment.get_lower()) * _span / (adjustment.get_upper() - adjustment.get_lower()));
597 PixFader::on_enter_notify_event (GdkEventCrossing*)
600 Keyboard::magic_widget_grab_focus ();
606 PixFader::on_leave_notify_event (GdkEventCrossing*)
610 Keyboard::magic_widget_drop_focus();
617 PixFader::set_adjustment_from_event (GdkEventButton* ev)
619 double fract = (_orien == VERT) ? (1.0 - (ev->y / _span)) : (ev->x / _span);
621 fract = min (1.0, fract);
622 fract = max (0.0, fract);
624 adjustment.set_value (fract * (adjustment.get_upper () - adjustment.get_lower ()));
628 PixFader::set_default_value (float d)
631 update_unity_position ();
635 PixFader::set_text (const std::string& str, bool centered)
637 if (_layout && _text == str) {
640 if (!_layout && !str.empty()) {
641 _layout = Pango::Layout::create (get_pango_context());
645 _centered_text = centered;
647 _layout->set_text (str);
648 _layout->get_pixel_size (_text_width, _text_height);
654 PixFader::on_state_changed (Gtk::StateType old_state)
656 Widget::on_state_changed (old_state);
662 PixFader::on_style_changed (const Glib::RefPtr<Gtk::Style>&)
665 std::string txt = _layout->get_text();
666 _layout.clear (); // drop reference to existing layout
668 set_text (txt, _centered_text);
670 /* patterns are cached and re-created as needed
671 * during 'expose' in the GUI thread */
677 PixFader::get_parent_bg ()
679 Widget* parent = get_parent ();
682 if (parent->get_has_window()) {
685 parent = parent->get_parent();
688 if (parent && parent->get_has_window()) {
689 if (_current_parent != parent) {
690 if (_parent_style_change) _parent_style_change.disconnect();
691 _current_parent = parent;
692 _parent_style_change = parent->signal_style_changed().connect (mem_fun (*this, &PixFader::on_style_changed));
694 return parent->get_style ()->get_bg (parent->get_state());
697 return get_style ()->get_bg (get_state());