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livetrax/libs/gtkmm2ext/fader.cc

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2015-05-06 09:43:14 -04:00
/*
Copyright (C) 2014 Waves Audio Ltd.
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.
$Id: fastmeter.h 570 2006-06-07 21:21:21Z sampo $
*/
#include <iostream>
#include "pbd/stacktrace.h"
#include "gtkmm2ext/fader.h"
#include "gtkmm2ext/keyboard.h"
#include "gtkmm2ext/rgb_macros.h"
#include "gtkmm2ext/utils.h"
#include "pbd/failed_constructor.h"
#include "pbd/file_utils.h"
#include "ardour/filesystem_paths.h"
using namespace Gtkmm2ext;
using namespace Gtk;
using namespace std;
#define CORNER_RADIUS 4
#define CORNER_SIZE 2
#define CORNER_OFFSET 1
#define FADER_RESERVE 5
static void get_closest_point_on_line(double xa, double ya, double xb, double yb, double xp, double yp, double& xl, double& yl )
{
// Storing vector A->B
double a_to_b_x = xb - xa;
double a_to_b_y = yb - ya;
// Storing vector A->P
double a_to_p_x = xp - xa;
double a_to_p_y = yp - ya;
// Basically finding the squared magnitude
// of a_to_b
double atb2 = a_to_b_x * a_to_b_x + a_to_b_y * a_to_b_y;
// The dot product of a_to_p and a_to_b
double atp_dot_atb = a_to_p_x * a_to_b_x + a_to_p_y * a_to_b_y;
// The normalized "distance" from a to
// your closest point
double t = atp_dot_atb / atb2;
// The vector perpendicular to a_to_b;
// This step can also be combined with the next
double perpendicular_x = -a_to_b_y;
double perpendicular_y = a_to_b_x;
// Finding Q, the point "in the right direction"
// If you want a mess, you can also combine this
// with the next step.
double xq = xp + perpendicular_x;
double yq = yp + perpendicular_y;
// Add the distance to A, moving
// towards B
double x = xa + a_to_b_x * t;
double y = ya + a_to_b_y * t;
if ((xa != xb)) {
if ((x < xa) && (x < xb)) {
if (xa < xb) {
x = xa;
y = ya;
} else {
x = xb;
y = yb;
}
} else if ((x > xa) && (x > xb)) {
if (xb > xa) {
x = xb;
y = yb;
} else {
x = xa;
y = ya;
}
}
} else {
if ((y < ya) && (y < yb)) {
if (ya < yb) {
x = xa;
y = ya;
} else {
x = xb;
y = yb;
}
} else if ((y > ya) && (y > yb)) {
if (yb > ya) {
x = xb;
y = yb;
} else {
x = xa;
y = ya;
}
}
}
xl = x;
yl = y;
}
Fader::Fader (Gtk::Adjustment& adj,
const Glib::RefPtr<Gdk::Pixbuf>& face_pixbuf,
const Glib::RefPtr<Gdk::Pixbuf>& active_face_pixbuf,
const Glib::RefPtr<Gdk::Pixbuf>& underlay_pixbuf,
const Glib::RefPtr<Gdk::Pixbuf>& handle_pixbuf,
const Glib::RefPtr<Gdk::Pixbuf>& active_handle_pixbuf,
int min_pos_x,
int min_pos_y,
int max_pos_x,
int max_pos_y,
bool read_only)
: adjustment (adj)
, _face_pixbuf (face_pixbuf)
, _active_face_pixbuf (active_face_pixbuf)
, _underlay_pixbuf (underlay_pixbuf)
, _handle_pixbuf (handle_pixbuf)
, _active_handle_pixbuf (active_handle_pixbuf)
, _min_pos_x (min_pos_x)
, _min_pos_y (min_pos_y)
, _max_pos_x (max_pos_x)
, _max_pos_y (max_pos_y)
, _default_value (adjustment.get_value())
, _dragging (false)
, _read_only (read_only)
, _grab_window (0)
, _touch_cursor (0)
{
update_unity_position ();
if (!_read_only) {
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);
}
adjustment.signal_value_changed().connect (mem_fun (*this, &Fader::adjustment_changed));
adjustment.signal_changed().connect (mem_fun (*this, &Fader::adjustment_changed));
CairoWidget::set_size_request(_face_pixbuf->get_width(), _face_pixbuf->get_height());
}
Fader::~Fader ()
{
if (_touch_cursor) {
delete _touch_cursor;
}
}
void
Fader::set_touch_cursor (const Glib::RefPtr<Gdk::Pixbuf>& touch_cursor)
{
_touch_cursor = new Gdk::Cursor (Gdk::Display::get_default(), touch_cursor, 12, 12);
}
void
Fader::render (cairo_t* cr, cairo_rectangle_t*)
{
get_handle_position (_last_drawn_x, _last_drawn_y);
if (_underlay_pixbuf != 0) {
cairo_rectangle (cr, 0, 0, get_width(), get_height());
gdk_cairo_set_source_pixbuf (cr,
_underlay_pixbuf->gobj(),
_last_drawn_x - (int)(_underlay_pixbuf->get_width()/2.0 + 0.5),
_last_drawn_y - (int)(_underlay_pixbuf->get_height()/2.0 + 0.5));
cairo_fill (cr);
}
cairo_rectangle (cr, 0, 0, get_width(), get_height());
gdk_cairo_set_source_pixbuf (cr,
((get_state () == Gtk::STATE_ACTIVE) && (_active_face_pixbuf != 0)) ?
_active_face_pixbuf->gobj() :
_face_pixbuf->gobj(),
0,
0);
cairo_fill (cr);
cairo_rectangle (cr, 0, 0, get_width(), get_height());
if (_dragging) {
gdk_cairo_set_source_pixbuf (cr,
_active_handle_pixbuf->gobj(),
_last_drawn_x - (int)(_active_handle_pixbuf->get_width()/2.0 + 0.5),
_last_drawn_y - (int)(_active_handle_pixbuf->get_height()/2.0 + 0.5));
} else {
gdk_cairo_set_source_pixbuf (cr,
_handle_pixbuf->gobj(),
_last_drawn_x - (int)(_handle_pixbuf->get_width()/2.0 + 0.5),
_last_drawn_y - (int)(_handle_pixbuf->get_height()/2.0 + 0.5));
}
cairo_fill (cr);
}
void
Fader::on_size_request (GtkRequisition* req)
{
req->width = _face_pixbuf->get_width();
req->height = _face_pixbuf->get_height();
}
void
Fader::on_size_allocate (Gtk::Allocation& alloc)
{
CairoWidget::on_size_allocate(alloc);
update_unity_position ();
}
bool
Fader::on_button_press_event (GdkEventButton* ev)
{
focus_handler();
if (_read_only) {
return false;
}
if (ev->type != GDK_BUTTON_PRESS) {
return false;
}
if (ev->button != 1 && ev->button != 2) {
return false;
}
if (_touch_cursor) {
get_window()->set_cursor (*_touch_cursor);
}
_grab_start_mouse_x = ev->x;
_grab_start_mouse_y = ev->y;
get_handle_position (_grab_start_handle_x, _grab_start_handle_y);
double hw = _handle_pixbuf->get_width();
double hh = _handle_pixbuf->get_height();
if ((ev->x < (_grab_start_handle_x - hw/2)) || (ev->x > (_grab_start_handle_x + hw/2)) || (ev->y < (_grab_start_handle_y - hh/2)) || (ev->y > (_grab_start_handle_y + hh/2))) {
return false;
}
double ev_pos_x;
double ev_pos_y;
get_closest_point_on_line(_min_pos_x, _min_pos_y,
_max_pos_x, _max_pos_y,
ev->x, ev->y,
ev_pos_x, ev_pos_y );
add_modal_grab ();
_grab_window = ev->window;
_dragging = true;
gdk_pointer_grab(ev->window,false,
GdkEventMask (Gdk::POINTER_MOTION_MASK | Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK),
NULL,
NULL,
ev->time);
queue_draw();
return true;
}
bool
Fader::on_button_release_event (GdkEventButton* ev)
{
if (_read_only) {
return false;
}
if (_touch_cursor) {
get_window()->set_cursor ();
}
if (_dragging) { //temp
remove_modal_grab();
_dragging = false;
gdk_pointer_ungrab (GDK_CURRENT_TIME);
queue_draw ();
}
return false;
}
bool
Fader::on_scroll_event (GdkEventScroll* ev)
{
if (_read_only) {
return false;
}
int step_factor = 1;
switch (ev->direction) {
case GDK_SCROLL_RIGHT:
case GDK_SCROLL_UP:
#ifdef __APPLE__
if ( ev->state & GDK_SHIFT_MASK ) {
step_factor = -1;
} else {
step_factor = 1;
}
#else
step_factor = 1;
#endif
break;
case GDK_SCROLL_LEFT:
case GDK_SCROLL_DOWN:
#ifdef __APPLE__
if ( ev->state & GDK_SHIFT_MASK ) {
step_factor = 1;
} else {
step_factor = -1;
}
#else
step_factor = -1;
#endif
break;
default:
return false;
}
adjustment.set_value (adjustment.get_value() + step_factor * (adjustment.get_step_increment() ));
return true;
}
bool
Fader::on_motion_notify_event (GdkEventMotion* ev)
{
if (_read_only) {
return false;
}
if (_dragging) {
double ev_pos_x;
double ev_pos_y;
if (ev->window != _grab_window) {
_grab_window = ev->window;
return true;
}
get_closest_point_on_line(_min_pos_x, _min_pos_y,
_max_pos_x, _max_pos_y,
_grab_start_handle_x + (ev->x - _grab_start_mouse_x), _grab_start_handle_y + (ev->y - _grab_start_mouse_y),
ev_pos_x, ev_pos_y );
double const fract = sqrt((ev_pos_x - _min_pos_x) * (ev_pos_x - _min_pos_x) +
(ev_pos_y - _min_pos_y) * (ev_pos_y - _min_pos_y)) /
sqrt((_max_pos_x - _min_pos_x) * (_max_pos_x - _min_pos_x) +
(_max_pos_y - _min_pos_y) * (_max_pos_y - _min_pos_y));
adjustment.set_value (adjustment.get_lower() + (adjustment.get_upper() - adjustment.get_lower()) * fract);
}
return true;
}
void
Fader::adjustment_changed ()
{
double handle_x;
double handle_y;
get_handle_position (handle_x, handle_y);
if ((handle_x != _last_drawn_x) || (handle_y != _last_drawn_y)) {
queue_draw ();
}
}
/** @return pixel offset of the current value from the right or bottom of the fader */
void
Fader::get_handle_position (double& x, double& y)
{
double fract = (adjustment.get_value () - adjustment.get_lower()) / ((adjustment.get_upper() - adjustment.get_lower()));
x = (int)(_min_pos_x + (_max_pos_x - _min_pos_x) * fract);
y = (int)(_min_pos_y + (_max_pos_y - _min_pos_y) * fract);
}
bool
Fader::on_enter_notify_event (GdkEventCrossing*)
{
_hovering = true;
Keyboard::magic_widget_grab_focus ();
queue_draw ();
return false;
}
bool
Fader::on_leave_notify_event (GdkEventCrossing*)
{
if (_read_only) {
return false;
}
if (!_dragging) {
_hovering = false;
Keyboard::magic_widget_drop_focus();
queue_draw ();
}
return false;
}
void
Fader::set_default_value (float d)
{
_default_value = d;
update_unity_position ();
}
void
Fader::update_unity_position ()
{
}