2 Copyright (C) 2006 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 $Id: fastmeter.h 570 2006-06-07 21:21:21Z sampo $
23 #include <gtkmm2ext/pixfader.h>
25 using namespace Gtkmm2ext;
30 PixFader::PixFader (Glib::RefPtr<Pixbuf> belt, Gtk::Adjustment& adj)
35 default_value = adjustment.get_value();
37 pixheight = pixbuf->get_height();
41 view.width = pixbuf->get_width();
42 view.height = pixheight / 2;
44 unity_y = (int) rint (view.height - (default_value * view.height)) - 1;
46 add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK|Gdk::SCROLL_MASK);
48 adjustment.signal_value_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
49 adjustment.signal_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
52 PixFader::~PixFader ()
57 PixFader::on_expose_event (GdkEventExpose* ev)
59 GdkRectangle intersection;
60 int dh = display_height ();
61 int offset_into_pixbuf = (int) floor (view.height / ((float) view.height / dh));
63 if (gdk_rectangle_intersect (&view, &ev->area, &intersection)) {
64 get_window()->draw_pixbuf(get_style()->get_fg_gc(get_state()), pixbuf,
65 intersection.x, offset_into_pixbuf + intersection.y,
66 intersection.x, intersection.y,
67 intersection.width, intersection.height,
68 Gdk::RGB_DITHER_NONE, 0, 0);
71 /* always draw the line */
73 get_window()->draw_line (get_style()->get_fg_gc(get_state()), 0, unity_y, view.width - 2, unity_y);
80 PixFader::on_size_request (GtkRequisition* req)
82 req->width = view.width;
83 req->height = view.height;
87 PixFader::on_button_press_event (GdkEventButton* ev)
92 if (!(ev->state & Gdk::SHIFT_MASK)) {
96 grab_window = ev->window;
109 PixFader::on_button_release_event (GdkEventButton* ev)
114 if (ev->state & GDK_CONTROL_MASK) {
115 if (ev->state & GDK_MOD1_MASK) {
124 switch (ev->button) {
130 if (ev->y == grab_start) {
131 /* no motion - just a click */
133 if (ev->y < view.height - display_height()) {
134 /* above the current display height, remember X Window coords */
135 adjustment.set_value (adjustment.get_value() + adjustment.get_step_increment());
137 adjustment.set_value (adjustment.get_value() - adjustment.get_step_increment());
143 if (ev->state & Gdk::SHIFT_MASK) {
144 adjustment.set_value (default_value);
154 fract = 1.0 - (ev->y / view.height); // inverted X Window coordinates, grrr
156 fract = min (1.0, fract);
157 fract = max (0.0, fract);
159 adjustment.set_value (scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
171 PixFader::on_scroll_event (GdkEventScroll* ev)
175 if (ev->state & GDK_CONTROL_MASK) {
176 if (ev->state & GDK_MOD1_MASK) {
185 switch (ev->direction) {
189 adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
191 case GDK_SCROLL_DOWN:
193 adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
202 PixFader::on_motion_notify_event (GdkEventMotion* ev)
209 if (ev->window != grab_window) {
211 grab_window = ev->window;
215 if (ev->state & GDK_CONTROL_MASK) {
216 if (ev->state & GDK_MOD1_MASK) {
225 delta = ev->y - grab_y;
228 fract = (delta / view.height);
230 fract = min (1.0, fract);
231 fract = max (-1.0, fract);
233 // X Window is top->bottom for 0..Y
237 adjustment.set_value (adjustment.get_value() + scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
244 PixFader::adjustment_changed ()
246 if (display_height() != last_drawn) {
252 PixFader::display_height ()
254 float fract = (adjustment.get_upper() - adjustment.get_value ()) / ((adjustment.get_upper() - adjustment.get_lower()));
255 return (int) floor (view.height * (1.0 - fract));