269 lines
5.0 KiB
C++
269 lines
5.0 KiB
C++
/*
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Copyright (C) 1999 Paul Barton-Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id$
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*/
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#include <gtkmm2ext/auto_spin.h>
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#include <cmath>
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using namespace Gtkmm2ext;
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using namespace std;
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#define upper adjustment.get_upper()
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#define lower adjustment.get_lower()
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#define step_increment adjustment.get_step_increment()
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#define page_increment adjustment.get_page_increment()
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const unsigned int AutoSpin::initial_timer_interval = 500; /* msecs */
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const unsigned int AutoSpin::timer_interval = 20; /* msecs */
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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)
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: adjustment (adjr),
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climb_rate (cr)
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{
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initial = adjustment.get_value();
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left_is_decrement = true;
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wrap = false;
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have_timer = false;
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need_timer = false;
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timer_calls = 0;
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round_to_steps = round_to_steps_yn;
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}
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void
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AutoSpin::stop_timer ()
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{
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if (have_timer) {
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gtk_timeout_remove (timeout_tag);
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have_timer = false;
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}
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}
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gint
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AutoSpin::stop_spinning (GdkEventButton *ev)
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{
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need_timer = false;
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stop_timer ();
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return FALSE;
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}
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gint
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AutoSpin::button_press (GdkEventButton *ev)
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{
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bool shifted = false;
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bool control = false;
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bool with_decrement = false;
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stop_spinning (0);
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if (ev->state & GDK_SHIFT_MASK) {
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/* use page shift */
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shifted = true;
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}
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if (ev->state & GDK_CONTROL_MASK) {
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/* go to upper/lower bound on button1/button2 */
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control = true;
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}
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/* XXX should figure out which button is left/right */
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switch (ev->button) {
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case 1:
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if (control) {
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set_value (left_is_decrement ? lower : upper);
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return TRUE;
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} else {
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if (left_is_decrement) {
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with_decrement = true;
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} else {
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with_decrement = false;
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}
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}
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break;
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case 2:
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if (!control) {
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set_value (initial);
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}
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return TRUE;
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break;
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case 3:
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if (control) {
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set_value (left_is_decrement ? upper : lower);
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return TRUE;
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}
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break;
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case 4:
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if (!control) {
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adjust_value (shifted ? page_increment : step_increment);
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} else {
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set_value (upper);
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}
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return TRUE;
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break;
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case 5:
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if (!control) {
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adjust_value (shifted ? -page_increment : -step_increment);
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} else {
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set_value (lower);
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}
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return TRUE;
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break;
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}
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start_spinning (with_decrement, shifted);
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return TRUE;
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}
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void
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AutoSpin::start_spinning (bool decrement, bool page)
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{
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timer_increment = page ? page_increment : step_increment;
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if (decrement) {
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timer_increment = -timer_increment;
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}
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adjust_value (timer_increment);
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have_timer = true;
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timer_calls = 0;
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timeout_tag = gtk_timeout_add (initial_timer_interval,
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AutoSpin::_timer,
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this);
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}
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gint
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AutoSpin::_timer (void *arg)
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{
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return ((AutoSpin *) arg)->timer ();
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}
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void
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AutoSpin::set_value (gfloat value)
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{
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if (round_to_steps)
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adjustment.set_value (floor((value / step_increment) + 0.5f) * step_increment);
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else
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adjustment.set_value (value);
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}
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bool
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AutoSpin::adjust_value (gfloat increment)
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{
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gfloat val;
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bool done = false;
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val = adjustment.get_value();
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val += increment;
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if (val > upper) {
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if (wrap) {
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val = lower;
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} else {
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val = upper;
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done = true;
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}
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} else if (val < lower) {
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if (wrap) {
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val = upper;
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} else {
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val = lower;
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done = true;
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}
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}
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set_value(val);
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return done;
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}
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gint
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AutoSpin::timer ()
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{
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bool done;
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int retval = FALSE;
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done = adjust_value (timer_increment);
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if (need_timer) {
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/* we're in the initial call, which happened
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after initial_timer_interval msecs. Now
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request a much more frequent update.
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*/
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timeout_tag = gtk_timeout_add (timer_interval,
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_timer,
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this);
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have_timer = true;
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need_timer = false;
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/* cancel this initial timeout */
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retval = FALSE;
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} else {
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/* this is the regular "fast" call after each
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timer_interval msecs.
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*/
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if (timer_calls < climb_timer_calls) {
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timer_calls++;
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} else {
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if (climb_rate > 0.0) {
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if (timer_increment > 0) {
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timer_increment += climb_rate;
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} else {
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timer_increment -= climb_rate;
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}
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}
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timer_calls = 0;
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}
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if (!done) {
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retval = TRUE;
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}
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}
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return retval;
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}
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void
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AutoSpin::set_bounds (gfloat init, gfloat up, gfloat down, bool with_reset)
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{
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adjustment.set_upper(up);
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adjustment.set_lower(down);
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initial = init;
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adjustment.changed ();
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if (with_reset) {
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adjustment.set_value (init);
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}
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}
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