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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"
#include "gtkmm2ext/rgb_macros.h"
using namespace Gtkmm2ext;
using namespace Gtk;
using namespace std;
int PixFader::fine_scale_modifier = Keyboard::PrimaryModifier;
int PixFader::extra_fine_scale_modifier = Keyboard::SecondaryModifier;
PixFader::PixFader (Glib::RefPtr<Gdk::Pixbuf> belt, Gtk::Adjustment& adj, int orientation, int fader_length)
: adjustment (adj),
pixbuf (belt),
_orien(orientation)
{
Cairo::Format format;
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));
if (pixbuf->get_has_alpha()) {
format = Cairo::FORMAT_ARGB32;
} else {
format = Cairo::FORMAT_RGB24;
}
belt_surface = Cairo::ImageSurface::create (format, pixbuf->get_width(), pixbuf->get_height());
belt_context = Cairo::Context::create (belt_surface);
Gdk::Cairo::set_source_pixbuf (belt_context, pixbuf, 0.0, 0.0);
belt_context->paint();
left_r = 0;
left_g = 0;
left_b = 0;
right_r = 0;
right_g = 0;
right_b = 0;
}
PixFader::~PixFader ()
{
}
void
PixFader::set_border_colors (uint32_t left, uint32_t right)
{
int r, g, b;
UINT_TO_RGB(left, &r, &g, &b);
left_r = r/255.0;
left_g = g/255.0;
left_b = b/255.0;
UINT_TO_RGB(right, &r, &g, &b);
right_r = r/255.0;
right_g = g/255.0;
right_b = b/255.0;
}
bool
PixFader::on_expose_event (GdkEventExpose* ev)
{
Cairo::RefPtr<Cairo::Context> context = get_window()->create_cairo_context();
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;
}
context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
context->clip ();
if (_orien == VERT) {
srcx = 0;
srcy = offset_into_pixbuf;
} else {
srcx = offset_into_pixbuf;
srcy = 0;
}
/* fader */
context->save();
context->set_source (belt_surface, -srcx, -srcy);
context->rectangle (0, 0, get_width(), get_height());
context->clip ();
context->paint();
context->restore();
/* bounding box lines (2 colors for nicer visuals) */
/* top and left side */
context->set_line_width (1);
context->set_source_rgb (left_r, left_g, left_b);
context->move_to (view.width - 1, 0); /* upper right */
context->line_to (0, 0); /* upper left */
context->line_to (0, view.height - 1);/* lower left */
context->stroke ();
/* bottom & right side */
context->set_line_width (1);
context->set_source_rgb (right_r, right_g, right_b);
context->move_to (0, view.height - 0.5); /* lower left */
context->line_to (view.width - 0.5, view.height - 0.5); /* lower right */
context->line_to (view.width - 0.5, 0); /* upper right */
context->stroke ();
/* always draw the unity-position line */
if (_orien == VERT) {
context->set_line_width (1);
context->set_source_rgb (0.0, 1.0, 0.0);
context->move_to (1, unity_loc);
context->line_to (girth, unity_loc);
context->stroke ();
} else {
context->set_line_width (1);
context->set_source_rgb (0.0, 1.0, 0.0);
context->move_to (unity_loc, 1);
context->line_to (unity_loc, girth - 1);
context->stroke ();
}
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)
{
if (ev->type != GDK_BUTTON_PRESS) {
return false;
}
if (ev->button != 1 && ev->button != 2) {
return false;
}
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;
if (ev->button == 2) {
set_adjustment_from_event (ev);
}
return true;
}
bool
PixFader::on_button_release_event (GdkEventButton* ev)
{
double const 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;
set_adjustment_from_event (ev);
}
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 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 & fine_scale_modifier) {
if (ev->state & extra_fine_scale_modifier) {
scale = 0.05;
} else {
scale = 0.1;
}
}
double const delta = ev_pos - grab_loc;
grab_loc = ev_pos;
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;
}
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_value () - adjustment.get_lower()) / ((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;
} else {
view.width = span = l;
}
update_unity_position ();
queue_draw ();
}
void
PixFader::update_unity_position ()
{
if (_orien == VERT) {
unity_loc = (int) rint (view.height * (1 - (default_value / (adjustment.get_upper() - adjustment.get_lower())))) - 1;
} else {
unity_loc = (int) rint (default_value * view.width);
}
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;
}
void
PixFader::set_adjustment_from_event (GdkEventButton* ev)
{
double fract = (_orien == VERT) ? (1.0 - (ev->y / span)) : (ev->x / span);
fract = min (1.0, fract);
fract = max (0.0, fract);
adjustment.set_value (fract * (adjustment.get_upper () - adjustment.get_lower ()));
}
void
PixFader::set_default_value (float d)
{
default_value = d;
update_unity_position ();
}