new fader design from thorwil, mostly

git-svn-id: svn://localhost/ardour2/trunk@1149 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 256 insertions, 0 deletions

diff --git a/libs/gtkmm2ext/pixfader.cc b/libs/gtkmm2ext/pixfader.cc
new file mode 100644
index 0000000000..429f5bf3c5
--- /dev/null
+++ b/libs/gtkmm2ext/pixfader.cc
@@ -0,0 +1,256 @@
+/*
+    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>
+
+using namespace Gtkmm2ext;
+using namespace Gtk;
+using namespace Gdk;
+using namespace std;
+
+PixFader::PixFader (Glib::RefPtr<Pixbuf> base, Glib::RefPtr<Pixbuf> handle, Gtk::Adjustment& adj)
+	: adjustment (adj),
+	  base_pixbuf (base),
+	  handle_pixbuf (handle)
+{
+	dragging = false;
+	default_value = adjustment.get_value();
+	last_drawn = -1;
+	pixrect.x = 0;
+	pixrect.y = 0;
+	pixrect.width  = base_pixbuf->get_width();
+	pixrect.height  = base_pixbuf->get_height();
+	pixheight = pixrect.height;
+
+	unity_y = (int) rint (pixrect.height - (default_value * pixrect.height));
+
+	add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK|Gdk::SCROLL_MASK);
+
+	adjustment.signal_value_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
+	adjustment.signal_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
+}
+
+PixFader::~PixFader ()
+{
+}
+
+bool
+PixFader::on_expose_event (GdkEventExpose* ev)
+{
+	GdkRectangle intersection;
+	GdkRectangle background;
+
+	pixrect.height = display_height ();
+
+	background.x = 0;
+	background.y = 0;
+	background.width = pixrect.width;
+	background.height = pixheight - pixrect.height;
+
+	if (gdk_rectangle_intersect (&background, &ev->area, &intersection)) {
+		get_window()->draw_pixbuf (get_style()->get_fg_gc (get_state()), base_pixbuf,
+					   intersection.x, intersection.y,
+					   0, 0,
+					   intersection.width, intersection.height,
+					   Gdk::RGB_DITHER_NONE, 0, 0);
+					  
+	} 
+
+	/* recompute the height of the handle area to use X Window's top->bottom coordinate
+	   system.
+	*/
+
+	pixrect.y = pixheight - pixrect.height;
+	
+	if (gdk_rectangle_intersect (&pixrect, &ev->area, &intersection)) {
+		get_window()->draw_pixbuf(get_style()->get_fg_gc(get_state()), handle_pixbuf, 
+					  intersection.x, intersection.y,
+					  0, pixrect.y, 
+					  intersection.width, intersection.height,
+					  Gdk::RGB_DITHER_NONE, 0, 0);
+	}
+
+	/* always draw the line */
+
+	get_window()->draw_line (get_style()->get_fg_gc(get_state()), 0, unity_y, pixrect.width, unity_y);
+
+	last_drawn = pixrect.height;
+	return true;
+}
+
+void
+PixFader::on_size_request (GtkRequisition* req)
+{
+	req->width = base_pixbuf->get_width();
+	req->height = base_pixbuf->get_height ();
+}
+
+bool
+PixFader::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
+PixFader::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 < (pixheight/2)) {
+					/* near the top */
+					fract = 1.0;
+				} else {
+					fract = 1.0 - (ev->y - pixheight);
+				}
+
+				fract = min (1.0, fract);
+				fract = max (0.0, fract);
+
+				adjustment.set_value (scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
+			}
+		} else {
+			if (ev->state & Gdk::SHIFT_MASK) {
+				adjustment.set_value (default_value);
+			}
+		}
+		break;
+	default:
+		break;
+	}
+	return false;
+}
+
+bool
+PixFader::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 */
+		adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
+		break;
+	case GDK_SCROLL_DOWN:
+		/* wheel down */
+		adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
+		break;
+	default:
+		break;
+	}
+	return false;
+}
+
+bool
+PixFader::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 / pixheight);
+
+		fract = min (1.0, fract);
+		fract = max (-1.0, fract);
+
+		// X Window is top->bottom for 0..Y
+		
+		fract = -fract;
+
+		adjustment.set_value (adjustment.get_value() + scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
+	}
+
+	return true;
+}
+
+void
+PixFader::adjustment_changed ()
+{
+	if (display_height() != last_drawn) {
+		queue_draw ();
+	}
+}