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livetrax/libs/gtkmm2ext/pixfader.cc

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/*
Copyright (C) 2006 Paul Davis
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 "gtkmm2ext/pixfader.h"
#include "gtkmm2ext/keyboard.h"
using namespace Gtkmm2ext;
using namespace Gtk;
using namespace Gdk;
using namespace std;
int PixFader::fine_scale_modifier = Keyboard::PrimaryModifier;
int PixFader::extra_fine_scale_modifier = Keyboard::SecondaryModifier;
PixFader::PixFader (Glib::RefPtr<Pixbuf> belt, Gtk::Adjustment& adj, int orientation, int fader_length)
: adjustment (adj),
pixbuf (belt),
_orien(orientation)
{
dragging = false;
default_value = adjustment.get_value();
last_drawn = -1;
view.x = 0;
view.y = 0;
if (orientation == VERT) {
view.width = girth = pixbuf->get_width();
} else {
view.height = girth = pixbuf->get_height();
}
set_fader_length (fader_length);
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, &PixFader::adjustment_changed));
adjustment.signal_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
}
PixFader::~PixFader ()
{
}
bool
PixFader::on_expose_event (GdkEventExpose* ev)
{
GdkRectangle intersection;
int srcx, srcy;
int const ds = display_span ();
int offset_into_pixbuf = (int) floor (span / ((float) span / ds));
/* account for fader lengths that are shorter than the fader pixbuf */
if (_orien == VERT) {
offset_into_pixbuf += pixbuf->get_height() / 2 - view.height;
} else {
offset_into_pixbuf += pixbuf->get_width() / 2 - view.width;
}
Glib::RefPtr<Gdk::GC> fg_gc (get_style()->get_fg_gc(get_state()));
if (gdk_rectangle_intersect (&view, &ev->area, &intersection)) {
if (_orien == VERT) {
srcx = intersection.x;
srcy = offset_into_pixbuf + intersection.y;
} else {
srcx = offset_into_pixbuf + intersection.x;
srcy = intersection.y;
}
get_window()->draw_pixbuf (fg_gc, pixbuf,
srcx, srcy,
intersection.x, intersection.y,
intersection.width, intersection.height,
Gdk::RGB_DITHER_NONE, 0, 0);
get_window()->draw_line (get_style()->get_bg_gc(STATE_ACTIVE), 0, 0, view.width - 1, 0); /* top */
get_window()->draw_line (get_style()->get_bg_gc(STATE_ACTIVE), 0, 0, 0, view.height - 1); /* left */
get_window()->draw_line (get_style()->get_bg_gc(STATE_NORMAL), view.width - 1, 0, view.width - 1, view.height - 1); /* right */
get_window()->draw_line (get_style()->get_bg_gc(STATE_NORMAL), 0, view.height - 1, view.width - 1, view.height - 1); /* bottom */
}
/* always draw the line */
if (_orien == VERT) {
get_window()->draw_line (fg_gc, 1, unity_loc, girth - 2, unity_loc);
} else {
get_window()->draw_line (fg_gc, unity_loc, 1, unity_loc, girth - 2);
}
last_drawn = ds;
return true;
}
void
PixFader::on_size_request (GtkRequisition* req)
{
req->width = view.width;
req->height = view.height;
}
bool
PixFader::on_button_press_event (GdkEventButton* ev)
{
switch (ev->button) {
case 1:
case 2:
add_modal_grab();
grab_loc = (_orien == VERT) ? ev->y : ev->x;
grab_start = (_orien == VERT) ? ev->y : ev->x;
grab_window = ev->window;
dragging = true;
break;
default:
break;
}
return false;
}
bool
PixFader::on_button_release_event (GdkEventButton* ev)
{
double fract, ev_pos;
ev_pos = (_orien == VERT) ? ev->y : ev->x;
switch (ev->button) {
case 1:
if (dragging) {
remove_modal_grab();
dragging = false;
if (ev_pos == grab_start) {
/* no motion - just a click */
if (ev->state & Keyboard::TertiaryModifier) {
adjustment.set_value (default_value);
} else if (ev->state & fine_scale_modifier) {
adjustment.set_value (adjustment.get_lower());
} else if ((_orien == VERT && ev_pos < span - display_span()) || (_orien == HORIZ && ev_pos > span - display_span())) {
/* above the current display height, remember X Window coords */
adjustment.set_value (adjustment.get_value() + adjustment.get_step_increment());
} else {
adjustment.set_value (adjustment.get_value() - adjustment.get_step_increment());
}
}
}
break;
case 2:
if (dragging) {
remove_modal_grab();
dragging = false;
fract = 1.0 - (ev_pos / span); // inverted X Window coordinates, grrr
fract = min (1.0, fract);
fract = max (0.0, fract);
adjustment.set_value (fract * (adjustment.get_upper() - adjustment.get_lower()));
}
break;
default:
break;
}
return false;
}
bool
PixFader::on_scroll_event (GdkEventScroll* ev)
{
double scale;
bool ret = false;
if (ev->state & fine_scale_modifier) {
if (ev->state & extra_fine_scale_modifier) {
scale = 0.01;
} else {
scale = 0.05;
}
} else {
scale = 0.25;
}
if (_orien == VERT) {
/* should left/right scroll affect vertical faders ? */
switch (ev->direction) {
case GDK_SCROLL_UP:
adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
ret = true;
break;
case GDK_SCROLL_DOWN:
adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
ret = true;
break;
default:
break;
}
} else {
/* up/down scrolls should definitely affect horizontal faders
because they are so much easier to use
*/
switch (ev->direction) {
case GDK_SCROLL_RIGHT:
case GDK_SCROLL_UP:
adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
ret = true;
break;
case GDK_SCROLL_LEFT:
case GDK_SCROLL_DOWN:
adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
ret = true;
break;
default:
break;
}
}
return ret;
}
bool
PixFader::on_motion_notify_event (GdkEventMotion* ev)
{
if (dragging) {
double fract, delta, scale, ev_pos;
ev_pos = (_orien == VERT) ? ev->y : ev->x;
//cerr << "PixFader::on_motion_notify_event() called x:y = " << ev->x << ":" << ev->y;
if (ev->window != grab_window) {
grab_loc = ev_pos;
grab_window = ev->window;
return true;
}
if (ev->state & fine_scale_modifier) {
if (ev->state & extra_fine_scale_modifier) {
scale = 0.05;
} else {
scale = 0.1;
}
} else {
scale = 1.0;
}
//cerr << " ev_pos=" << ev_pos << " grab_loc=" << grab_loc;
delta = ev_pos - grab_loc;
grab_loc = ev_pos;
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()));
//cerr << " adj=" << adjustment.get_value() << " fract=" << fract << " delta=" << delta << " scale=" << scale << endl;
}
return true;
}
void
PixFader::adjustment_changed ()
{
if (display_span() != last_drawn) {
queue_draw ();
}
}
/** @return pixel offset of the current value from the right or bottom of the fader */
int
PixFader::display_span ()
{
float fract = (adjustment.get_upper() - adjustment.get_value ()) / ((adjustment.get_upper() - adjustment.get_lower()));
return (_orien == VERT) ? (int)floor (span * (1.0 - fract)) : (int)floor (span * fract);
}
void
PixFader::set_fader_length (int l)
{
if (_orien == VERT) {
view.height = span = l;
unity_loc = (int) rint (view.height - (default_value * view.height)) - 1;
} else {
view.width = span = l;
unity_loc = (int) rint (default_value * view.width) - 1;
}
queue_draw ();
}
bool
PixFader::on_enter_notify_event (GdkEventCrossing*)
{
Keyboard::magic_widget_grab_focus ();
return false;
}
bool
PixFader::on_leave_notify_event (GdkEventCrossing*)
{
Keyboard::magic_widget_drop_focus();
return false;
}