Move Gtkmm2ext widgets into libwidget

libs/widgets/auto_spin.cc

@@ -0,0 +1,298 @@
+/*
+    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/keyboard.h"
+#include "widgets/auto_spin.h"
+
+using namespace Gtkmm2ext;
+using namespace ArdourWidgets;
+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 */
+
+AutoSpin::AutoSpin (Gtk::Adjustment &adjr, gfloat cr, bool round_to_steps_yn)
+	: adjustment (adjr),
+	  climb_rate (cr)
+
+{
+	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);
+		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) {
+		case 1:
+			if (control) {
+				set_value (left_is_decrement ? lower : upper);
+				return TRUE;
+			} else {
+				if (left_is_decrement) {
+					with_decrement = true;
+				} else {
+					with_decrement = false;
+				}
+			}
+			break;
+
+		case 2:
+			if (!control) {
+				set_value (initial);
+			}
+			return TRUE;
+			break;
+
+		case 3:
+			if (control) {
+				set_value (left_is_decrement ? upper : lower);
+				return TRUE;
+			}
+			break;
+
+		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;
+	}
+	return TRUE;
+}
+
+void
+AutoSpin::start_spinning (bool decrement, bool page)
+{
+	timer_increment = page ? page_increment : step_increment;
+
+	if (decrement) {
+		timer_increment = -timer_increment;
+	}
+
+	adjust_value (timer_increment);
+
+	have_timer = true;
+	timer_calls = 0;
+	timeout_tag = g_timeout_add (initial_timer_interval,
+			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;
+
+	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;
+		}
+	}
+
+	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.
+		   */
+
+		timeout_tag = g_timeout_add (timer_interval,
+				_timer,
+				this);
+		have_timer = true;
+		need_timer = false;
+
+		/* cancel this initial timeout */
+
+		retval = FALSE;
+
+	} else {
+		/* this is the regular "fast" call after each
+		   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;
+}
+
+void
+AutoSpin::set_bounds (gfloat init, gfloat up, gfloat down, bool with_reset)
+{
+	adjustment.set_upper (up);
+	adjustment.set_lower (down);
+
+	initial = init;
+
+	adjustment.changed ();
+
+	if (with_reset) {
+		adjustment.set_value (init);
+	}
+}