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livetrax/libs/widgets/ardour_fader.cc

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/*
* Copyright (C) 2006 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2017-2018 Robin Gareus <robin@gareus.org>
* Copyright (C) 2017 Julien "_FrnchFrgg_" RIVAUD <frnchfrgg@free.fr>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <iostream>
#include <assert.h>
#include "gtkmm2ext/cairo_widget.h"
#include "gtkmm2ext/colors.h"
#include "gtkmm2ext/keyboard.h"
#include "gtkmm2ext/rgb_macros.h"
#include "gtkmm2ext/utils.h"
#include "widgets/ardour_fader.h"
#include "widgets/ui_config.h"
using namespace Gtk;
using namespace std;
using namespace Gtkmm2ext;
using namespace ArdourWidgets;
#define CORNER_RADIUS 2.5
#define CORNER_SIZE 2
#define CORNER_OFFSET 1
#define FADER_RESERVE 6
std::list<ArdourFader::FaderImage*> ArdourFader::_patterns;
ArdourFader::ArdourFader (Gtk::Adjustment& adj, int orientation, int fader_length, int fader_girth)
: FaderWidget (adj, orientation)
, _layout (0)
, _text_width (0)
, _text_height (0)
, _span (fader_length)
, _girth (fader_girth)
, _min_span (fader_length)
, _min_girth (fader_girth)
, _pattern (0)
, _centered_text (true)
, _current_parent (0)
, have_explicit_bg (false)
, have_explicit_fg (false)
, outline_color (0)
{
update_unity_position ();
add_events (Gdk::TOUCH_UPDATE_MASK);
if (_orien == VERT) {
CairoWidget::set_size_request(_girth, _span);
} else {
CairoWidget::set_size_request(_span, _girth);
}
outline_color = UIConfigurationBase::instance().color ("fader outline");
}
ArdourFader::~ArdourFader ()
{
if (_parent_style_change) _parent_style_change.disconnect();
if (_layout) _layout.clear (); // drop reference to existing layout
}
void
ArdourFader::flush_pattern_cache () {
for (list<FaderImage*>::iterator f = _patterns.begin(); f != _patterns.end(); ++f) {
cairo_pattern_destroy ((*f)->pattern);
}
_patterns.clear();
}
cairo_pattern_t*
ArdourFader::find_pattern (double afr, double afg, double afb,
double abr, double abg, double abb,
int w, int h)
{
for (list<FaderImage*>::iterator f = _patterns.begin(); f != _patterns.end(); ++f) {
if ((*f)->matches (afr, afg, afb, abr, abg, abb, w, h)) {
return (*f)->pattern;
}
}
return 0;
}
void
ArdourFader::create_patterns ()
{
Gdk::Color c = fg_color (get_state());
float fr, fg, fb;
float br, bg, bb;
fr = c.get_red_p ();
fg = c.get_green_p ();
fb = c.get_blue_p ();
c = bg_color (get_state());
br = c.get_red_p ();
bg = c.get_green_p ();
bb = c.get_blue_p ();
cairo_surface_t* surface;
cairo_t* tc = 0;
if (get_width() <= 1 || get_height() <= 1) {
return;
}
if ((_pattern = find_pattern (fr, fg, fb, br, bg, bb, get_width(), get_height())) != 0) {
/* found it - use it */
return;
}
if (_orien == VERT) {
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, get_width(), get_height() * 2.0);
tc = cairo_create (surface);
/* paint background + border */
cairo_pattern_t* shade_pattern = cairo_pattern_create_linear (0.0, 0.0, get_width(), 0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 0, br*0.4,bg*0.4,bb*0.4, 1.0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 0.25, br*0.6,bg*0.6,bb*0.6, 1.0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 1, br*0.8,bg*0.8,bb*0.8, 1.0);
cairo_set_source (tc, shade_pattern);
cairo_rectangle (tc, 0, 0, get_width(), get_height() * 2.0);
cairo_fill (tc);
cairo_pattern_destroy (shade_pattern);
/* paint lower shade */
shade_pattern = cairo_pattern_create_linear (0.0, 0.0, get_width() - 2 - CORNER_OFFSET , 0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 0, fr*0.8,fg*0.8,fb*0.8, 1.0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 1, fr*0.6,fg*0.6,fb*0.6, 1.0);
cairo_set_source (tc, shade_pattern);
Gtkmm2ext::rounded_top_half_rectangle (tc, CORNER_OFFSET, get_height() + CORNER_OFFSET,
get_width() - CORNER_SIZE, get_height(), CORNER_RADIUS);
cairo_fill (tc);
cairo_pattern_destroy (shade_pattern);
_pattern = cairo_pattern_create_for_surface (surface);
} else {
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, get_width() * 2.0, get_height());
tc = cairo_create (surface);
/* paint right shade (background section)*/
cairo_pattern_t* shade_pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, get_height());
cairo_pattern_add_color_stop_rgba (shade_pattern, 0, br*0.4,bg*0.4,bb*0.4, 1.0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 0.25, br*0.6,bg*0.6,bb*0.6, 1.0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 1, br*0.8,bg*0.8,bb*0.8, 1.0);
cairo_set_source (tc, shade_pattern);
cairo_rectangle (tc, 0, 0, get_width() * 2.0, get_height());
cairo_fill (tc);
/* paint left shade (active section/foreground) */
shade_pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, get_height());
cairo_pattern_add_color_stop_rgba (shade_pattern, 0, fr*0.8,fg*0.8,fb*0.8, 1.0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 1, fr*0.6,fg*0.6,fb*0.6, 1.0);
cairo_set_source (tc, shade_pattern);
Gtkmm2ext::rounded_right_half_rectangle (tc, CORNER_OFFSET, CORNER_OFFSET,
get_width() - CORNER_OFFSET, get_height() - CORNER_SIZE, CORNER_RADIUS);
cairo_fill (tc);
cairo_pattern_destroy (shade_pattern);
_pattern = cairo_pattern_create_for_surface (surface);
}
/* cache it for others to use */
_patterns.push_back (new FaderImage (_pattern, fr, fg, fb, br, bg, bb, get_width(), get_height()));
cairo_destroy (tc);
cairo_surface_destroy (surface);
}
Gdk::Color
ArdourFader::bg_color (Gtk::StateType s)
{
if (have_explicit_bg) {
return gdk_color_from_rgba (explicit_bg);
}
return get_style()->get_bg (s);
}
Gdk::Color
ArdourFader::fg_color (Gtk::StateType s)
{
if (have_explicit_fg) {
Gtkmm2ext::HSV hsv;
if (_hovering || (s == Gtk::STATE_PRELIGHT)) {
hsv = HSV (explicit_fg);
hsv.s *= 0.50;
return gdk_color_from_rgba (hsv.color());
}
switch (s) {
case Gtk::STATE_NORMAL:
return gdk_color_from_rgba (explicit_fg);
return gdk_color_from_rgba (hsv.color());
case Gtk::STATE_SELECTED:
return gdk_color_from_rgba (explicit_fg);
case Gtk::STATE_ACTIVE:
return gdk_color_from_rgba (explicit_fg);
case Gtk::STATE_INSENSITIVE:
return get_style()->get_fg (s);
case Gtk::STATE_PRELIGHT:
break;
}
}
return get_style()->get_fg (s);
}
void
ArdourFader::render (Cairo::RefPtr<Cairo::Context> const& ctx, cairo_rectangle_t* area)
{
cairo_t* cr = ctx->cobj();
if (!_pattern) {
create_patterns();
}
if (!_pattern) {
/* this isn't supposed to be happen, but some wackiness whereby
* the pixfader ends up with a 1xN or Nx1 size allocation
* leads to it. the basic wackiness needs fixing but we
* shouldn't crash. just fill in the expose area with
* our bg color.
*/
CairoWidget::set_source_rgb_a (cr, bg_color (get_state()), 1);
cairo_rectangle (cr, area->x, area->y, area->width, area->height);
cairo_fill (cr);
return;
}
OnExpose();
int ds = display_span ();
const float w = get_width();
const float h = get_height();
CairoWidget::set_source_rgb_a (cr, get_parent_bg(), 1);
cairo_rectangle (cr, 0, 0, w, h);
cairo_fill(cr);
cairo_set_line_width (cr, 2);
Gtkmm2ext::set_source_rgba (cr, outline_color);
cairo_matrix_t matrix;
Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, CORNER_OFFSET, w-CORNER_SIZE, h-CORNER_SIZE, CORNER_RADIUS);
// we use a 'trick' here: The stoke is off by .5px but filling the interior area
// after a stroke of 2px width results in an outline of 1px
cairo_stroke_preserve(cr);
if (_orien == VERT) {
if (ds > h - FADER_RESERVE - CORNER_OFFSET) {
ds = h - FADER_RESERVE - CORNER_OFFSET;
}
if (!CairoWidget::flat_buttons()) {
cairo_set_source (cr, _pattern);
cairo_matrix_init_translate (&matrix, 0, (h - ds));
cairo_pattern_set_matrix (_pattern, &matrix);
} else {
CairoWidget::set_source_rgb_a (cr, bg_color (get_state()), 1);
cairo_fill (cr);
CairoWidget::set_source_rgb_a (cr, fg_color (get_state()), 1);
Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, ds + CORNER_OFFSET,
w - CORNER_SIZE, h - ds - CORNER_SIZE, CORNER_RADIUS);
}
cairo_fill (cr);
} else {
if (ds < FADER_RESERVE) {
ds = FADER_RESERVE;
}
assert(ds <= w);
/*
* if ds == w, the pattern does not need to be translated
* if ds == 0 (or FADER_RESERVE), the pattern needs to be moved
* w to the left, which is -w in pattern space, and w in user space
* if ds == 10, then the pattern needs to be moved w - 10
* to the left, which is -(w-10) in pattern space, which
* is (w - 10) in user space
* thus: translation = (w - ds)
*/
if (!CairoWidget::flat_buttons() ) {
cairo_set_source (cr, _pattern);
cairo_matrix_init_translate (&matrix, w - ds, 0);
cairo_pattern_set_matrix (_pattern, &matrix);
} else {
CairoWidget::set_source_rgb_a (cr, bg_color (get_state()), 1);
cairo_fill (cr);
CairoWidget::set_source_rgb_a (cr, fg_color (get_state()), 1);
Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, CORNER_OFFSET,
ds - CORNER_SIZE, h - CORNER_SIZE, CORNER_RADIUS);
}
cairo_fill (cr);
}
/* draw the unity-position line if it's not at either end*/
if (!(_tweaks & NoShowUnityLine) && _unity_loc > CORNER_RADIUS) {
cairo_set_line_width(cr, 1);
cairo_set_line_cap(cr, CAIRO_LINE_CAP_ROUND);
Gdk::Color c = fg_color (Gtk::STATE_ACTIVE);
cairo_set_source_rgba (cr, c.get_red_p() * 1.5, c.get_green_p() * 1.5, c.get_blue_p() * 1.5, 0.85);
if (_orien == VERT) {
if (_unity_loc < h - CORNER_RADIUS) {
cairo_move_to (cr, 1.5, _unity_loc + CORNER_OFFSET + .5);
cairo_line_to (cr, _girth - 1.5, _unity_loc + CORNER_OFFSET + .5);
cairo_stroke (cr);
}
} else {
if (_unity_loc < w - CORNER_RADIUS) {
cairo_move_to (cr, _unity_loc - CORNER_OFFSET + .5, 1.5);
cairo_line_to (cr, _unity_loc - CORNER_OFFSET + .5, _girth - 1.5);
cairo_stroke (cr);
}
}
}
if (_layout && !_text.empty() && _orien == HORIZ) {
Gdk::Color bg_col;
cairo_save (cr);
if (_centered_text) {
/* center text */
cairo_move_to (cr, (w - _text_width)/2.0, h/2.0 - _text_height/2.0);
bg_col = bg_color (get_state());
} else if (ds > .5 * w) {
cairo_move_to (cr, CORNER_OFFSET + 3, h/2.0 - _text_height/2.0);
bg_col = fg_color (get_state());
} else {
cairo_move_to (cr, w - _text_width - CORNER_OFFSET - 3, h/2.0 - _text_height/2.0);
bg_col = bg_color (get_state());
}
const uint32_t r = bg_col.get_red_p () * 255.0;
const uint32_t g = bg_col.get_green_p () * 255.0;
const uint32_t b = bg_col.get_blue_p () * 255.0;
const uint32_t a = 0xff;
uint32_t rgba = RGBA_TO_UINT (r, g, b, a);
rgba = contrasting_text_color (rgba);
Gdk::Color text_color;
text_color.set_rgb ((rgba >> 24)*256, ((rgba & 0xff0000) >> 16)*256, ((rgba & 0xff00) >> 8)*256);
CairoWidget::set_source_rgb_a (cr, text_color, 1.);
pango_cairo_show_layout (cr, _layout->gobj());
cairo_restore (cr);
}
if (!get_sensitive()) {
Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, CORNER_OFFSET, w-CORNER_SIZE, h-CORNER_SIZE, CORNER_RADIUS);
cairo_set_source_rgba (cr, 0.505, 0.517, 0.525, 0.4);
cairo_fill (cr);
} else if (_hovering && CairoWidget::widget_prelight() && !have_explicit_fg) {
Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, CORNER_OFFSET, w-CORNER_SIZE, h-CORNER_SIZE, CORNER_RADIUS);
cairo_set_source_rgba (cr, 0.905, 0.917, 0.925, 0.1);
cairo_fill (cr);
}
}
void
ArdourFader::on_size_request (GtkRequisition* req)
{
if (_orien == VERT) {
req->width = (_min_girth ? _min_girth : -1);
req->height = (_min_span ? _min_span : -1);
} else {
req->height = (_min_girth ? _min_girth : -1);
req->width = (_min_span ? _min_span : -1);
}
}
void
ArdourFader::on_size_allocate (Gtk::Allocation& alloc)
{
int old_girth = _girth;
int old_span = _span;
CairoWidget::on_size_allocate(alloc);
if (_orien == VERT) {
_girth = alloc.get_width ();
_span = alloc.get_height ();
} else {
_girth = alloc.get_height ();
_span = alloc.get_width ();
}
if (get_realized() && ((old_girth != _girth) || (old_span != _span))) {
/* recreate patterns in case we've changed size */
create_patterns ();
}
update_unity_position ();
}
bool
ArdourFader::on_motion_notify_event (GdkEventMotion* ev)
{
if (_dragging) {
double scale = 1.0;
double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
if (ev->window != _grab_window) {
_grab_loc = ev_pos;
_grab_window = ev->window;
return true;
}
if (ev->state & Keyboard::GainFineScaleModifier) {
if (ev->state & Keyboard::GainExtraFineScaleModifier) {
scale = 0.005;
} else {
scale = 0.1;
}
}
double const delta = ev_pos - _grab_loc;
_grab_loc = ev_pos;
const double off = FADER_RESERVE + ((_orien == VERT) ? CORNER_OFFSET : 0);
const double span = _span - off;
double fract = (delta / span);
fract = min (1.0, fract);
fract = max (-1.0, fract);
// X Window is top->bottom for 0..Y
if (_orien == VERT) {
fract = -fract;
}
_adjustment.set_value (_adjustment.get_value() + scale * fract * (_adjustment.get_upper() - _adjustment.get_lower()));
}
return true;
}
bool
ArdourFader::on_touch_update_event (GdkEventTouch* ev)
{
GdkEventMotion mev;
mev.window = ev->window;
mev.time = ev->time;
mev.x = ev->x;
mev.y = ev->y;
mev.state = 0;
return ArdourFader::on_motion_notify_event (&mev);
}
/** @return pixel offset of the current value from the right or bottom of the fader */
int
ArdourFader::display_span ()
{
float fract = (_adjustment.get_value () - _adjustment.get_lower()) / ((_adjustment.get_upper() - _adjustment.get_lower()));
int ds;
if (_orien == VERT) {
const double off = FADER_RESERVE + CORNER_OFFSET;
const double span = _span - off;
ds = (int)rint (span * (1.0 - fract));
} else {
const double off = FADER_RESERVE;
const double span = _span - off;
ds = (int)rint (span * fract + off);
}
return ds;
}
void
ArdourFader::update_unity_position ()
{
if (_orien == VERT) {
const double span = _span - FADER_RESERVE - CORNER_OFFSET;
_unity_loc = (int) rint (span * (1 - ((_default_value - _adjustment.get_lower()) / (_adjustment.get_upper() - _adjustment.get_lower())))) - 1;
} else {
const double span = _span - FADER_RESERVE;
_unity_loc = (int) rint (FADER_RESERVE + (_default_value - _adjustment.get_lower()) * span / (_adjustment.get_upper() - _adjustment.get_lower()));
}
queue_draw ();
}
void
ArdourFader::set_adjustment_from_event (GdkEventButton* ev)
{
const double off = FADER_RESERVE + ((_orien == VERT) ? CORNER_OFFSET : 0);
const double span = _span - off;
double fract = (_orien == VERT) ? (1.0 - ((ev->y - off) / span)) : ((ev->x - off) / span);
fract = min (1.0, fract);
fract = max (0.0, fract);
_adjustment.set_value (fract * (_adjustment.get_upper () - _adjustment.get_lower ()));
}
void
ArdourFader::set_default_value (float d)
{
_default_value = d;
update_unity_position ();
}
void
ArdourFader::set_text (const std::string& str, bool centered, bool expose)
{
if (_layout && _text == str) {
return;
}
if (!_layout && !str.empty()) {
_layout = Pango::Layout::create (get_pango_context());
}
_text = str;
_centered_text = centered;
if (_layout) {
_layout->set_text (str);
_layout->get_pixel_size (_text_width, _text_height);
// queue_resize ();
if (expose) queue_draw ();
}
}
void
ArdourFader::on_state_changed (Gtk::StateType old_state)
{
Widget::on_state_changed (old_state);
create_patterns ();
queue_draw ();
}
void
ArdourFader::on_style_changed (const Glib::RefPtr<Gtk::Style>& style)
{
CairoWidget::on_style_changed (style);
if (_layout) {
std::string txt = _layout->get_text();
_layout.clear (); // drop reference to existing layout
_text = "";
set_text (txt, _centered_text, false);
queue_resize ();
}
/* patterns are cached and re-created as needed
* during 'expose' in the GUI thread */
_pattern = 0;
queue_draw ();
}
Gdk::Color
ArdourFader::get_parent_bg ()
{
Widget* parent = get_parent ();
while (parent) {
if (parent->get_has_window()) {
break;
}
parent = parent->get_parent();
}
if (parent && parent->get_has_window()) {
if (_current_parent != parent) {
if (_parent_style_change) _parent_style_change.disconnect();
_current_parent = parent;
_parent_style_change = parent->signal_style_changed().connect (mem_fun (*this, &ArdourFader::on_style_changed));
}
return parent->get_style ()->get_bg (parent->get_state());
}
return get_style ()->get_bg (get_state());
}
void
ArdourFader::set_bg (Gtkmm2ext::Color c)
{
explicit_bg = c;
have_explicit_bg = true;
_pattern = 0;
queue_draw ();
}
void
ArdourFader::set_fg (Gtkmm2ext::Color c)
{
explicit_fg = c;
have_explicit_fg = true;
_pattern = 0;
queue_draw ();
}
void
ArdourFader::unset_bg ()
{
if (have_explicit_bg) {
have_explicit_bg = false;
_pattern = 0;
queue_draw ();
}
}
void
ArdourFader::unset_fg ()
{
if (have_explicit_fg) {
have_explicit_fg = false;
_pattern = 0;
queue_draw ();
}
}
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