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 $
24 #include "gtkmm2ext/pixfader.h"
25 #include "gtkmm2ext/keyboard.h"
26 #include "gtkmm2ext/rgb_macros.h"
27 #include "gtkmm2ext/utils.h"
29 using namespace Gtkmm2ext;
33 #define CORNER_RADIUS 4
34 #define FADER_RESERVE (2*CORNER_RADIUS)
36 std::list<PixFader::FaderImage*> PixFader::_patterns;
38 PixFader::PixFader (Gtk::Adjustment& adj, int orientation, int fader_length, int fader_girth)
42 , _orien (orientation)
48 default_value = adjustment.get_value();
49 update_unity_position ();
51 add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK|Gdk::SCROLL_MASK|Gdk::ENTER_NOTIFY_MASK|Gdk::LEAVE_NOTIFY_MASK);
53 adjustment.signal_value_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
54 adjustment.signal_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
57 PixFader::~PixFader ()
62 PixFader::find_pattern (double afr, double afg, double afb,
63 double abr, double abg, double abb,
66 for (list<FaderImage*>::iterator f = _patterns.begin(); f != _patterns.end(); ++f) {
67 if ((*f)->matches (afr, afg, afb, abr, abg, abb, w, h)) {
75 PixFader::create_patterns ()
77 Gdk::Color c = get_style()->get_fg (get_state());
82 fg = c.get_green_p ();
85 c = get_style()->get_bg (get_state());
88 bg = c.get_green_p ();
91 if ( !_text.empty()) {
92 _layout->get_pixel_size (_text_width, _text_height);
98 c = get_style()->get_text (get_state());
100 text_r = c.get_red_p ();
101 text_g = c.get_green_p ();
102 text_b = c.get_blue_p ();
104 cairo_surface_t* surface;
106 float radius = CORNER_RADIUS;
108 double w = get_width();
110 if (w <= 1 || get_height() <= 1) {
114 if ((pattern = find_pattern (fr, fg, fb, br, bg, bb, get_width(), get_height())) != 0) {
115 /* found it - use it */
119 if (_orien == VERT) {
121 surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, get_width(), get_height() * 2.0);
122 tc = cairo_create (surface);
124 /* paint background + border */
126 cairo_pattern_t* shade_pattern = cairo_pattern_create_linear (0.0, 0.0, get_width(), 0);
127 cairo_pattern_add_color_stop_rgba (shade_pattern, 0, br*0.8,bg*0.8,bb*0.8, 1.0);
128 cairo_pattern_add_color_stop_rgba (shade_pattern, 1, br*0.6,bg*0.6,bb*0.6, 1.0);
129 cairo_set_source (tc, shade_pattern);
130 cairo_rectangle (tc, 0, 0, get_width(), get_height() * 2.0);
133 cairo_pattern_destroy (shade_pattern);
135 /* paint lower shade */
139 shade_pattern = cairo_pattern_create_linear (0.0, 0.0, w, 0);
140 cairo_pattern_add_color_stop_rgba (shade_pattern, 0, fr*0.8,fg*0.8,fb*0.8, 1.0);
141 cairo_pattern_add_color_stop_rgba (shade_pattern, 1, fr*0.6,fg*0.6,fb*0.6, 1.0);
142 cairo_set_source (tc, shade_pattern);
143 Gtkmm2ext::rounded_top_half_rectangle (tc, 1.0, get_height(), w, get_height(), radius-1.5);
146 cairo_pattern_destroy (shade_pattern);
148 pattern = cairo_pattern_create_for_surface (surface);
152 surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, get_width() * 2.0, get_height());
153 tc = cairo_create (surface);
155 /* paint right shade (background section)*/
157 cairo_pattern_t* shade_pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, get_height());
158 cairo_pattern_add_color_stop_rgba (shade_pattern, 0, br*0.8,bg*0.8,bb*0.8, 1.0);
159 cairo_pattern_add_color_stop_rgba (shade_pattern, 1, br*0.6,bg*0.6,bb*0.6, 1.0);
160 cairo_set_source (tc, shade_pattern);
161 cairo_rectangle (tc, 0, 0, get_width() * 2.0, get_height());
164 /* paint left shade (active section/foreground) */
166 shade_pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, get_height());
167 cairo_pattern_add_color_stop_rgba (shade_pattern, 0, fr*0.8,fg*0.8,fb*0.8, 1.0);
168 cairo_pattern_add_color_stop_rgba (shade_pattern, 1, fr*0.6,fg*0.6,fb*0.6, 1.0);
169 cairo_set_source (tc, shade_pattern);
170 Gtkmm2ext::rounded_right_half_rectangle (tc, 0, 1, get_width(), get_height() - 2.0, radius-1.5);
172 cairo_pattern_destroy (shade_pattern);
174 pattern = cairo_pattern_create_for_surface (surface);
177 /* cache it for others to use */
179 _patterns.push_back (new FaderImage (pattern, fr, fg, fb, br, bg, bb, get_width(), get_height()));
182 cairo_surface_destroy (surface);
186 PixFader::on_expose_event (GdkEventExpose* ev)
188 Cairo::RefPtr<Cairo::Context> context = get_window()->create_cairo_context();
189 cairo_t* cr = context->cobj();
197 /* this isn't supposed to be happen, but some wackiness whereby
198 the pixfader ends up with a 1xN or Nx1 size allocation
199 leads to it. the basic wackiness needs fixing but we
200 shouldn't crash. just fill in the expose area with
204 Gdk::Color c = get_style()->get_bg (get_state());
208 bg = c.get_green_p ();
209 bb = c.get_blue_p ();
210 cairo_set_source_rgb (cr, br, bg, bb);
211 cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
217 cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
220 int ds = display_span ();
221 float w = get_width();
222 float h = get_height();
224 cairo_matrix_t matrix;
226 if (_orien == VERT) {
228 if (ds > h - FADER_RESERVE) {
229 ds = h - FADER_RESERVE;
232 cairo_set_source (cr, pattern);
233 cairo_matrix_init_translate (&matrix, 0, (h - ds));
234 cairo_pattern_set_matrix (pattern, &matrix);
235 Gtkmm2ext::rounded_rectangle (cr, 0, 0, w, h, CORNER_RADIUS-1.5);
240 if (ds < FADER_RESERVE) {
245 if ds == w, the pattern does not need to be translated
246 if ds == 0 (or FADER_RESERVE), the pattern needs to be moved
247 w to the left, which is -w in pattern space, and w in
249 if ds == 10, then the pattern needs to be moved w - 10
250 to the left, which is -(w-10) in pattern space, which
251 is (w - 10) in user space
253 thus: translation = (w - ds)
256 cairo_set_source (cr, pattern);
257 cairo_matrix_init_translate (&matrix, w - ds, 0);
258 cairo_pattern_set_matrix (pattern, &matrix);
259 Gtkmm2ext::rounded_rectangle (cr, 0, 0, w, h, CORNER_RADIUS-1.5);
263 /* draw the unity-position line if it's not at either end*/
265 if ( _orien == VERT) {
266 if (unity_loc < h ) {
267 context->set_line_width (1);
268 context->set_source_rgb (0.0, 1.0, 0.0);
269 context->move_to (1, unity_loc);
270 context->line_to (girth - 2.0, unity_loc);
274 if ( unity_loc < w ){
275 context->set_line_width (1);
276 context->set_source_rgb (0.0, 1.0, 0.0);
277 context->move_to (unity_loc, 1);
278 context->line_to (unity_loc, girth - 2.0);
284 if ( !_text.empty() ) {
289 cairo_move_to (cr, (get_width() - _text_width)/2.0, get_height()/2.0 - _text_height/2.0);
290 cairo_set_source_rgba (cr, text_r, text_g, text_b, 0.9);
291 pango_cairo_show_layout (cr, _layout->gobj());
294 // if (Config->get_widget_prelight()) { //pixfader does not have access to config
296 Gtkmm2ext::rounded_rectangle (cr, 0, 0, get_width(), get_height(), 3);
297 cairo_set_source_rgba (cr, 0.905, 0.917, 0.925, 0.1);
308 PixFader::on_size_request (GtkRequisition* req)
310 if (_orien == VERT) {
320 PixFader::on_size_allocate (Gtk::Allocation& alloc)
322 DrawingArea::on_size_allocate(alloc);
324 if (_orien == VERT) {
325 girth = alloc.get_width ();
326 span = alloc.get_height ();
328 girth = alloc.get_height ();
329 span = alloc.get_width ();
332 update_unity_position ();
336 PixFader::on_button_press_event (GdkEventButton* ev)
338 if (ev->type != GDK_BUTTON_PRESS) {
342 if (ev->button != 1 && ev->button != 2) {
347 grab_loc = (_orien == VERT) ? ev->y : ev->x;
348 grab_start = (_orien == VERT) ? ev->y : ev->x;
349 grab_window = ev->window;
351 gdk_pointer_grab(ev->window,false,
352 GdkEventMask( Gdk::POINTER_MOTION_MASK | Gdk::BUTTON_PRESS_MASK |Gdk::BUTTON_RELEASE_MASK),
355 if (ev->button == 2) {
356 set_adjustment_from_event (ev);
363 PixFader::on_button_release_event (GdkEventButton* ev)
365 double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
367 switch (ev->button) {
372 gdk_pointer_ungrab (GDK_CURRENT_TIME);
375 Keyboard::magic_widget_drop_focus();
379 if (ev_pos == grab_start) {
381 /* no motion - just a click */
383 if (ev->state & Keyboard::TertiaryModifier) {
384 adjustment.set_value (default_value);
385 } else if (ev->state & Keyboard::GainFineScaleModifier) {
386 adjustment.set_value (adjustment.get_lower());
387 } else if ((_orien == VERT && ev_pos < display_span()) || (_orien == HORIZ && ev_pos > display_span())) {
388 /* above the current display height, remember X Window coords */
389 adjustment.set_value (adjustment.get_value() + adjustment.get_step_increment());
391 adjustment.set_value (adjustment.get_value() - adjustment.get_step_increment());
402 set_adjustment_from_event (ev);
403 gdk_pointer_ungrab (GDK_CURRENT_TIME);
416 PixFader::on_scroll_event (GdkEventScroll* ev)
421 if (ev->state & Keyboard::GainFineScaleModifier) {
422 if (ev->state & Keyboard::GainExtraFineScaleModifier) {
431 if (_orien == VERT) {
433 /* should left/right scroll affect vertical faders ? */
435 switch (ev->direction) {
438 adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
441 case GDK_SCROLL_DOWN:
442 adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
450 /* up/down scrolls should definitely affect horizontal faders
451 because they are so much easier to use
454 switch (ev->direction) {
456 case GDK_SCROLL_RIGHT:
458 adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
461 case GDK_SCROLL_LEFT:
462 case GDK_SCROLL_DOWN:
463 adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
474 PixFader::on_motion_notify_event (GdkEventMotion* ev)
478 double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
480 if (ev->window != grab_window) {
482 grab_window = ev->window;
486 if (ev->state & Keyboard::GainFineScaleModifier) {
487 if (ev->state & Keyboard::GainExtraFineScaleModifier) {
494 double const delta = ev_pos - grab_loc;
497 double fract = (delta / span);
499 fract = min (1.0, fract);
500 fract = max (-1.0, fract);
502 // X Window is top->bottom for 0..Y
504 if (_orien == VERT) {
508 adjustment.set_value (adjustment.get_value() + scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
515 PixFader::adjustment_changed ()
517 if (display_span() != last_drawn) {
522 /** @return pixel offset of the current value from the right or bottom of the fader */
524 PixFader::display_span ()
526 float fract = (adjustment.get_value () - adjustment.get_lower()) / ((adjustment.get_upper() - adjustment.get_lower()));
528 if (_orien == VERT) {
529 ds = (int)floor ( span * (1.0 - fract));
531 ds = (int)floor (span * fract);
538 PixFader::set_fader_length (int l)
541 update_unity_position ();
546 PixFader::update_unity_position ()
548 if (_orien == VERT) {
549 unity_loc = (int) rint (span * (1 - (default_value / (adjustment.get_upper() - adjustment.get_lower())))) - 1;
551 unity_loc = (int) rint (default_value * span / (adjustment.get_upper() - adjustment.get_lower()));
558 PixFader::on_enter_notify_event (GdkEventCrossing*)
561 Keyboard::magic_widget_grab_focus ();
567 PixFader::on_leave_notify_event (GdkEventCrossing*)
571 Keyboard::magic_widget_drop_focus();
578 PixFader::set_adjustment_from_event (GdkEventButton* ev)
580 double fract = (_orien == VERT) ? (1.0 - (ev->y / span)) : (ev->x / span);
582 fract = min (1.0, fract);
583 fract = max (0.0, fract);
585 adjustment.set_value (fract * (adjustment.get_upper () - adjustment.get_lower ()));
589 PixFader::set_default_value (float d)
592 update_unity_position ();
596 PixFader::set_text (const std::string& str)
600 if (!_layout && !_text.empty()) {
601 _layout = Pango::Layout::create (get_pango_context());
605 _layout->set_text (str);
606 _layout->get_pixel_size (_text_width, _text_height);
613 PixFader::on_state_changed (Gtk::StateType old_state)
615 Widget::on_state_changed (old_state);
620 PixFader::on_style_changed (const Glib::RefPtr<Gtk::Style>&)
623 std::string txt = _layout->get_text();
624 _layout.clear (); // drop reference to existing layout
628 /* remember that all patterns are cached and not owned by an individual
629 pixfader. we will lazily create a new pattern when needed.