rollback to 3428, before the mysterious removal of libs/* at 3431/3432

git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 265 insertions, 0 deletions

diff --git a/libs/gtkmm2ext/pixscroller.cc b/libs/gtkmm2ext/pixscroller.cc
new file mode 100644
index 0000000000..f459726f27
--- /dev/null
+++ b/libs/gtkmm2ext/pixscroller.cc
@@ -0,0 +1,265 @@
+/*
+    Copyright (C) 2005 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.
+
+    $Id$
+*/
+#include <iostream>
+#include <algorithm>
+#include <cmath>
+
+#include <gtkmm.h>
+
+#include <gtkmm2ext/pixscroller.h>
+
+using namespace std;
+using namespace Gtk;
+using namespace Gtkmm2ext;
+
+PixScroller::PixScroller (Adjustment& a, 
+			  Glib::RefPtr<Gdk::Pixbuf> s,
+			  Glib::RefPtr<Gdk::Pixbuf> r)
+	: adj (a),
+	  rail (r),
+	  slider (s)
+{
+	dragging = false;
+	add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK|Gdk::SCROLL_MASK);
+
+	adj.signal_value_changed().connect (mem_fun (*this, &PixScroller::adjustment_changed));
+	default_value = adj.get_value();
+
+	sliderrect.set_width(slider->get_width());
+	sliderrect.set_height(slider->get_height());
+	railrect.set_width(rail->get_width());
+	railrect.set_height(rail->get_height());
+
+	railrect.set_y(sliderrect.get_height() / 2);
+	sliderrect.set_x(0);
+
+	overall_height = railrect.get_height() + sliderrect.get_height();
+
+	sliderrect.set_y((int) rint ((overall_height - sliderrect.get_height()) * (adj.get_upper() - adj.get_value())));
+	railrect.set_x((sliderrect.get_width() / 2) - 2);
+}
+
+void
+PixScroller::on_size_request (GtkRequisition* requisition)
+{
+	requisition->width = sliderrect.get_width();
+	requisition->height = overall_height;
+}
+
+bool
+PixScroller::on_expose_event (GdkEventExpose* ev)
+{
+	GdkRectangle intersect;
+	Glib::RefPtr<Gdk::Window> win (get_window());
+
+	win->draw_rectangle (get_style()->get_bg_gc(get_state()), TRUE, 
+			    ev->area.x,
+			    ev->area.y,
+			    ev->area.width,
+			    ev->area.height);
+
+	if (gdk_rectangle_intersect (railrect.gobj(), &ev->area, &intersect)) {
+		Glib::RefPtr<Gdk::GC> gc(get_style()->get_bg_gc(get_state()));
+		win->draw_pixbuf (gc, rail, 
+				  intersect.x - railrect.get_x(),
+				  intersect.y - railrect.get_y(),
+				  intersect.x, 
+				  intersect.y, 
+				  intersect.width,
+				  intersect.height,
+				  Gdk::RGB_DITHER_NONE, 0, 0);
+	}
+	
+	if (gdk_rectangle_intersect (sliderrect.gobj(), &ev->area, &intersect)) {
+		Glib::RefPtr<Gdk::GC> gc(get_style()->get_fg_gc(get_state()));
+		// Glib::RefPtr<Gdk::Bitmap> mask (slider_mask);
+
+		GdkGCValues values;
+		gdk_gc_get_values(gc->gobj(), &values);
+		gc->set_clip_origin (sliderrect.get_x(), sliderrect.get_y());
+		// gc->set_clip_mask (mask);
+		win->draw_pixbuf (gc, slider, 
+				  intersect.x - sliderrect.get_x(),
+				  intersect.y - sliderrect.get_y(),
+				  intersect.x, 
+				  intersect.y, 
+				  intersect.width,
+				  intersect.height,
+				  Gdk::RGB_DITHER_NONE, 0, 0);
+		gc->set_clip_origin (values.clip_x_origin, values.clip_y_origin);
+		// gdk_gc_set_clip_mask (gc->gobj(), values.clip_mask);
+	}
+
+
+	return true;
+}
+
+bool
+PixScroller::on_button_press_event (GdkEventButton* ev)
+{
+	switch (ev->button) {
+	case 1:
+		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
+PixScroller::on_button_release_event (GdkEventButton* ev)
+{
+	double scale;
+	
+	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 */
+				double fract;
+
+				if (ev->y < sliderrect.get_height()/2) {
+					/* near the top */
+					fract = 1.0;
+				} else {
+					fract = 1.0 - (ev->y - sliderrect.get_height()/2) / railrect.get_height();
+				}
+
+				fract = min (1.0, fract);
+				fract = max (0.0, fract);
+
+				adj.set_value (scale * fract * (adj.get_upper() - adj.get_lower()));
+			}
+		} else {
+			if (ev->state & Gdk::SHIFT_MASK) {
+				adj.set_value (default_value);
+				cerr << "default value = " << default_value << endl;
+			}
+		}
+		break;
+	default:
+		break;
+	}
+	return false;
+}
+
+bool
+PixScroller::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 */
+		adj.set_value (adj.get_value() + (adj.get_page_increment() * scale));
+		break;
+	case GDK_SCROLL_DOWN:
+		/* wheel down */
+		adj.set_value (adj.get_value() - (adj.get_page_increment() * scale));
+		break;
+	default:
+		break;
+	}
+	return false;
+}
+
+bool
+PixScroller::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 / railrect.get_height());
+
+		fract = min (1.0, fract);
+		fract = max (-1.0, fract);
+		
+		fract = -fract;
+
+		adj.set_value (adj.get_value() + scale * fract * (adj.get_upper() - adj.get_lower()));
+	}
+
+	return true;
+}
+
+void
+PixScroller::adjustment_changed ()
+{
+	int y = (int) rint ((overall_height - sliderrect.get_height()) * (adj.get_upper() - adj.get_value()));
+
+	if (y != sliderrect.get_y()) {
+		sliderrect.set_y(y);
+		queue_draw ();
+	}
+}