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livetrax/libs/gtkmm2ext/auto_spin.cc

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/*
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Copyright (C) 1999 Paul Barton-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.
$Id$
*/
#include <cmath>
#include "gtkmm2ext/auto_spin.h"
#include "gtkmm2ext/keyboard.h"
using namespace Gtkmm2ext;
using namespace std;
#define upper adjustment.get_upper()
#define lower adjustment.get_lower()
#define step_increment adjustment.get_step_increment()
#define page_increment adjustment.get_page_increment()
const unsigned int AutoSpin::initial_timer_interval = 500; /* msecs */
const unsigned int AutoSpin::timer_interval = 20; /* msecs */
const unsigned int AutoSpin::climb_timer_calls = 5; /* between climbing */
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AutoSpin::AutoSpin (Gtk::Adjustment &adjr, gfloat cr, bool round_to_steps_yn)
: adjustment (adjr),
climb_rate (cr)
{
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initial = adjustment.get_value ();
left_is_decrement = true;
wrap = false;
have_timer = false;
need_timer = false;
timer_calls = 0;
round_to_steps = round_to_steps_yn;
}
void
AutoSpin::stop_timer ()
{
if (have_timer) {
g_source_remove (timeout_tag);
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have_timer = false;
}
}
gint
AutoSpin::stop_spinning (GdkEventButton */*ev*/)
{
need_timer = false;
stop_timer ();
return FALSE;
}
gint
AutoSpin::button_press (GdkEventButton *ev)
{
bool shifted = false;
bool control = false;
bool with_decrement = false;
stop_spinning (0);
if (ev->type == GDK_2BUTTON_PRESS || ev->type == GDK_3BUTTON_PRESS ) {
return true;
}
if (ev->state & Keyboard::TertiaryModifier) {
/* use page shift */
shifted = true;
}
if (ev->state & Keyboard::PrimaryModifier) {
/* go to upper/lower bound on button1/button2 */
control = true;
}
/* XXX should figure out which button is left/right */
switch (ev->button) {
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case 1:
if (control) {
set_value (left_is_decrement ? lower : upper);
return TRUE;
} else {
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if (left_is_decrement) {
with_decrement = true;
} else {
with_decrement = false;
}
}
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break;
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case 2:
if (!control) {
set_value (initial);
}
return TRUE;
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break;
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case 3:
if (control) {
set_value (left_is_decrement ? upper : lower);
return TRUE;
}
break;
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case 4:
if (!control) {
adjust_value (shifted ? page_increment : step_increment);
} else {
set_value (upper);
}
return TRUE;
break;
case 5:
if (!control) {
adjust_value (shifted ? -page_increment : -step_increment);
} else {
set_value (lower);
}
return TRUE;
break;
}
start_spinning (with_decrement, shifted);
return TRUE;
}
gint
AutoSpin::scroll_event (GdkEventScroll *ev)
{
stop_spinning (0);
gfloat increment = step_increment;
if (ev->state & Keyboard::TertiaryModifier) {
increment = page_increment;
}
switch (ev->direction) {
case GDK_SCROLL_DOWN:
case GDK_SCROLL_LEFT:
adjust_value (-increment);
break;
case GDK_SCROLL_RIGHT:
case GDK_SCROLL_UP:
adjust_value (increment);
break;
}
}
void
AutoSpin::start_spinning (bool decrement, bool page)
{
timer_increment = page ? page_increment : step_increment;
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if (decrement) {
timer_increment = -timer_increment;
}
adjust_value (timer_increment);
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have_timer = true;
timer_calls = 0;
timeout_tag = g_timeout_add (initial_timer_interval,
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AutoSpin::_timer,
this);
}
gint
AutoSpin::_timer (void *arg)
{
return ((AutoSpin *) arg)->timer ();
}
void
AutoSpin::set_value (gfloat value)
{
if (round_to_steps)
adjustment.set_value (floor((value / step_increment) + 0.5f) * step_increment);
else
adjustment.set_value (value);
}
bool
AutoSpin::adjust_value (gfloat increment)
{
gfloat val;
bool done = false;
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val = adjustment.get_value ();
val += increment;
if (val > upper) {
if (wrap) {
val = lower;
} else {
val = upper;
done = true;
}
} else if (val < lower) {
if (wrap) {
val = upper;
} else {
val = lower;
done = true;
}
}
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set_value (val);
return done;
}
gint
AutoSpin::timer ()
{
bool done;
int retval = FALSE;
done = adjust_value (timer_increment);
if (need_timer) {
/* we're in the initial call, which happened
after initial_timer_interval msecs. Now
request a much more frequent update.
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*/
timeout_tag = g_timeout_add (timer_interval,
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_timer,
this);
have_timer = true;
need_timer = false;
/* cancel this initial timeout */
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retval = FALSE;
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} else {
/* this is the regular "fast" call after each
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timer_interval msecs.
*/
if (timer_calls < climb_timer_calls) {
timer_calls++;
} else {
if (climb_rate > 0.0) {
if (timer_increment > 0) {
timer_increment += climb_rate;
} else {
timer_increment -= climb_rate;
}
}
timer_calls = 0;
}
if (!done) {
retval = TRUE;
}
}
return retval;
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}
void
AutoSpin::set_bounds (gfloat init, gfloat up, gfloat down, bool with_reset)
{
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adjustment.set_upper (up);
adjustment.set_lower (down);
initial = init;
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adjustment.changed ();
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if (with_reset) {
adjustment.set_value (init);
}
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}