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livetrax/libs/canvas/step_button.cc

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/*
Copyright (C) 2017 Paul Davis
Author: Carl Hetherington <cth@carlh.net>
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <iostream>
#include <cairomm/context.h>
#include <cairomm/pattern.h>
#include "pbd/compose.h"
#include "canvas/canvas.h"
#include "canvas/debug.h"
#include "canvas/step_button.h"
#include "canvas/text.h"
#include "gtkmm2ext/utils.h"
using namespace std;
using namespace ArdourCanvas;
using namespace Gtkmm2ext;
using namespace Cairo;
StepButton::StepButton (Canvas* canvas, double w, double h, Gtkmm2ext::Color c)
: Item (canvas)
, width (w)
, height (h)
, label (new Text (canvas))
, current_value (0)
, prelight (false)
, highlight (false)
, dragging (false)
, clicking (false)
, color (c)
{
label->set (string_compose ("%1", rint (current_value)));
label->set_color (contrasting_text_color (c));
label->set_font_description (Pango::FontDescription ("Sans 9"));
add (label);
create_patterns ();
Event.connect (sigc::mem_fun (*this, &StepButton::event_handler));
label->Event.connect (sigc::mem_fun (*this, &StepButton::event_handler));
Rect r = label->bounding_box ();
label->set_position (Duple ((width - r.width())/2.0, (height - r.height())/2.0));
}
void
StepButton::compute_bounding_box () const
{
_bounding_box = Rect (0, 0, width, height);
add_child_bounding_boxes ();
_bounding_box_dirty = false;
}
#define CORNER_RADIUS 5
void
StepButton::create_patterns ()
{
double r, g, b, a;
inactive_pattern = LinearGradient::create (0.0, 0.0, width, height);
color_to_rgba (color.darker (0.95).color(), r, g, b, a);
inactive_pattern->add_color_stop_rgb (0.00, r, g, b);
color_to_rgba (color.darker (0.85).color(), r, g, b, a);
inactive_pattern->add_color_stop_rgb (1.00, r, g, b);
enabled_pattern = LinearGradient::create (0.0, 0.0, width, height);
color_to_rgba (color.lighter (0.95).color(), r, g, b, a);
enabled_pattern->add_color_stop_rgb (0.00, r, g, b);
color_to_rgba (color.lighter (0.85).color(), r, g, b, a);
enabled_pattern->add_color_stop_rgb (1.00, r, g, b);
}
void
StepButton::set_color (Gtkmm2ext::Color c)
{
color = c;
label->set_color (contrasting_text_color (c));
create_patterns ();
redraw ();
}
void
StepButton::set_size (double w, double h)
{
width = w;
height = h;
_bounding_box_dirty = true;
create_patterns ();
redraw ();
}
void
StepButton::set_value (double val)
{
val = rint (val);
if (val <= 0) { val = 0;}
if (val >= 127) { val = 127;}
if (val == current_value) {
return;
}
current_value = val;
label->set (string_compose ("%1", (int) current_value));
/* move to recenter */
Rect r = label->bounding_box ();
label->set_position (Duple ((width - r.width())/2.0, (height - r.height())/2.0));
redraw ();
}
void
StepButton::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
{
Rect self = item_to_window (_bounding_box, false);
Rect draw = self.intersection (area);
if (!draw) {
return;
}
double cr, g, b, a;
context->save ();
context->set_operator (OPERATOR_OVER);
/* basic (rounded) rectangle, with pattern to fill */
rounded_rectangle (context, self.x0 + 2.5, self.y0 + 2.5, width - 4, height - 4, CORNER_RADIUS);
if (current_value > 0) {
color_to_rgba (color.lighter (0.95).color(), cr, g, b, a);
context->set_source_rgb (cr, g, b);
context->set_source (enabled_pattern);
context->fill_preserve ();
float fc = current_value / 127.f;
context->set_source_rgba (fc, .6 * fc, .2 * fc, .6);
} else {
context->set_source (inactive_pattern);
}
context->fill_preserve ();
/* draw a (hard-coded) black outline around the same shape */
context->set_line_width (.75);
context->set_source_rgba (.0, .0, .0, 1.0);
context->stroke_preserve ();
context->clip ();
/* draw several lines on the edges to "shade" them */
for (int r = 2 * CORNER_RADIUS; r > 0; --r) {
context->set_line_width (r);
const float alpha = 0.1 - 0.1 * r / (2 * CORNER_RADIUS + 1.f);
color_to_rgba (color.darker (0.95).color(), cr, g, b, a);
context->set_source_rgba (cr, g, b, alpha);
/* draw a line along the top side */
context->move_to(self.x0, self.y0 + 2.5);
context->rel_line_to(width, 0);
context->stroke();
/* draw a line down the left side */
context->move_to(self.x0 + 2.5, self.y0);
context->rel_line_to(0, height);
context->stroke();
/* draw a line along the bottom edge */
context->set_source_rgba (.0, .0, .0, alpha);
context->move_to(self.x0 + 2.5, self.y1 - 1.5);
context->rel_line_to(width - 4, 0);
context->stroke();
/* draw a line down the right hand side */
context->move_to(self.x1 - 2.5, self.y0 + 1.5);
context->rel_line_to(0, height - 4);
context->stroke();
}
if (highlight) {
context->set_operator (Cairo::OPERATOR_OVER);
context->set_source_rgba (1.0, 0.0, 0.0, .2);
rounded_rectangle (context, self.x0 + 2.5, self.y0 + 2.5, width - 4, height - 4, CORNER_RADIUS);
context->fill();
}
if (prelight) {
context->set_operator (Cairo::OPERATOR_OVER);
color_to_rgba (contrasting_text_color (color.color()), cr, g, b, a);
context->set_source_rgba (cr, g, b, 0.1);
rounded_rectangle (context, self.x0 + 2.5, self.y0 + 2.5, width - 4, height - 4, CORNER_RADIUS);
context->fill();
}
context->restore ();
Item::render_children (area, context);
}
void
StepButton::set_highlight (bool yn)
{
if (highlight != yn) {
highlight = yn;
redraw ();
}
}
bool
StepButton::event_handler (GdkEvent *ev)
{
if (ev->type == GDK_ENTER_NOTIFY) {
prelight = true;
redraw ();
} else if (ev->type == GDK_LEAVE_NOTIFY) {
prelight = false;
redraw ();
}
return false;
}