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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>
using namespace Gtkmm2ext;
using namespace Gtk;
using namespace Gdk;
using namespace std;
PixFader::PixFader (Glib::RefPtr<Pixbuf> belt, Gtk::Adjustment& adj)
: adjustment (adj),
pixbuf (belt)
{
dragging = false;
default_value = adjustment.get_value();
last_drawn = -1;
pixheight = pixbuf->get_height();
view.x = 0;
view.y = 0;
view.width = pixbuf->get_width();
view.height = pixheight / 2;
unity_y = (int) rint (view.height - (default_value * view.height)) - 1;
add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK|Gdk::SCROLL_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 dh = display_height ();
int offset_into_pixbuf = (int) floor (view.height / ((float) view.height / dh));
if (gdk_rectangle_intersect (&view, &ev->area, &intersection)) {
get_window()->draw_pixbuf(get_style()->get_fg_gc(get_state()), pixbuf,
intersection.x, offset_into_pixbuf + intersection.y,
intersection.x, intersection.y,
intersection.width, intersection.height,
Gdk::RGB_DITHER_NONE, 0, 0);
}
/* always draw the line */
get_window()->draw_line (get_style()->get_fg_gc(get_state()), 0, unity_y, view.width - 2, unity_y);
last_drawn = dh;
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:
if (!(ev->state & Gdk::SHIFT_MASK)) {
add_modal_grab();
grab_y = ev->y;
grab_start = ev->y;
grab_window = ev->window;
dragging = true;
}
break;
default:
break;
}
return false;
}
bool
PixFader::on_button_release_event (GdkEventButton* ev)
{
double scale;
double fract;
if (ev->state & GDK_CONTROL_MASK) {
if (ev->state & GDK_MOD1_MASK) {
scale = 0.05;
} else {
scale = 0.1;
}
} else {
scale = 1.0;
}
switch (ev->button) {
case 1:
if (dragging) {
remove_modal_grab();
dragging = false;
if (ev->y == grab_start) {
/* no motion - just a click */
if (ev->y < view.height - display_height()) {
/* 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());
}
}
} else {
if (ev->state & Gdk::SHIFT_MASK) {
adjustment.set_value (default_value);
}
}
break;
case 2:
if (dragging) {
remove_modal_grab();
dragging = false;
fract = 1.0 - (ev->y / view.height); // inverted X Window coordinates, grrr
fract = min (1.0, fract);
fract = max (0.0, fract);
adjustment.set_value (scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
}
break;
default:
break;
}
return false;
}
bool
PixFader::on_scroll_event (GdkEventScroll* ev)
{
double scale;
if (ev->state & GDK_CONTROL_MASK) {
if (ev->state & GDK_MOD1_MASK) {
scale = 0.05;
} else {
scale = 0.1;
}
} else {
scale = 0.5;
}
switch (ev->direction) {
case GDK_SCROLL_UP:
/* wheel up */
adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
break;
case GDK_SCROLL_DOWN:
/* wheel down */
adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
break;
default:
break;
}
return false;
}
bool
PixFader::on_motion_notify_event (GdkEventMotion* ev)
{
if (dragging) {
double fract;
double delta;
double scale;
if (ev->window != grab_window) {
grab_y = ev->y;
grab_window = ev->window;
return true;
}
if (ev->state & GDK_CONTROL_MASK) {
if (ev->state & GDK_MOD1_MASK) {
scale = 0.05;
} else {
scale = 0.1;
}
} else {
scale = 1.0;
}
delta = ev->y - grab_y;
grab_y = ev->y;
fract = (delta / view.height);
fract = min (1.0, fract);
fract = max (-1.0, fract);
// X Window is top->bottom for 0..Y
fract = -fract;
adjustment.set_value (adjustment.get_value() + scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
}
return true;
}
void
PixFader::adjustment_changed ()
{
if (display_height() != last_drawn) {
queue_draw ();
}
}
int
PixFader::display_height ()
{
float fract = (adjustment.get_upper() - adjustment.get_value ()) / ((adjustment.get_upper() - adjustment.get_lower()));
return (int) floor (view.height * (1.0 - fract));
}