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"
24 #include "gtkmm2ext/keyboard.h"
26 using namespace Gtkmm2ext;
32 int PixFader::fine_scale_modifier = Keyboard::PrimaryModifier;
33 int PixFader::extra_fine_scale_modifier = Keyboard::SecondaryModifier;
35 PixFader::PixFader (Glib::RefPtr<Pixbuf> belt, Gtk::Adjustment& adj, int orientation, int fader_length)
42 default_value = adjustment.get_value();
48 if (orientation == VERT) {
49 view.width = girth = pixbuf->get_width();
51 view.height = girth = pixbuf->get_height();
54 set_fader_length (fader_length);
56 add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK|Gdk::SCROLL_MASK|Gdk::ENTER_NOTIFY_MASK|Gdk::LEAVE_NOTIFY_MASK);
58 adjustment.signal_value_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
59 adjustment.signal_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
62 PixFader::~PixFader ()
67 PixFader::on_expose_event (GdkEventExpose* ev)
69 GdkRectangle intersection;
72 int const ds = display_span ();
74 int offset_into_pixbuf = (int) floor (span / ((float) span / ds));
76 /* account for fader lengths that are shorter than the fader pixbuf */
78 offset_into_pixbuf += pixbuf->get_height() / 2 - view.height;
80 offset_into_pixbuf += pixbuf->get_width() / 2 - view.width;
83 Glib::RefPtr<Gdk::GC> fg_gc (get_style()->get_fg_gc(get_state()));
85 if (gdk_rectangle_intersect (&view, &ev->area, &intersection)) {
87 srcx = intersection.x;
88 srcy = offset_into_pixbuf + intersection.y;
90 srcx = offset_into_pixbuf + intersection.x;
91 srcy = intersection.y;
93 get_window()->draw_pixbuf (fg_gc, pixbuf,
95 intersection.x, intersection.y,
96 intersection.width, intersection.height,
97 Gdk::RGB_DITHER_NONE, 0, 0);
99 get_window()->draw_line (get_style()->get_bg_gc(STATE_ACTIVE), 0, 0, view.width - 1, 0); /* top */
100 get_window()->draw_line (get_style()->get_bg_gc(STATE_ACTIVE), 0, 0, 0, view.height - 1); /* left */
101 get_window()->draw_line (get_style()->get_bg_gc(STATE_NORMAL), view.width - 1, 0, view.width - 1, view.height - 1); /* right */
102 get_window()->draw_line (get_style()->get_bg_gc(STATE_NORMAL), 0, view.height - 1, view.width - 1, view.height - 1); /* bottom */
105 /* always draw the line */
106 if (_orien == VERT) {
107 get_window()->draw_line (fg_gc, 1, unity_loc, girth - 2, unity_loc);
109 get_window()->draw_line (fg_gc, unity_loc, 1, unity_loc, girth - 2);
116 PixFader::on_size_request (GtkRequisition* req)
118 req->width = view.width;
119 req->height = view.height;
123 PixFader::on_button_press_event (GdkEventButton* ev)
125 if (ev->type != GDK_BUTTON_PRESS) {
129 switch (ev->button) {
133 grab_loc = (_orien == VERT) ? ev->y : ev->x;
134 grab_start = (_orien == VERT) ? ev->y : ev->x;
135 grab_window = ev->window;
147 PixFader::on_button_release_event (GdkEventButton* ev)
149 double fract, ev_pos;
151 ev_pos = (_orien == VERT) ? ev->y : ev->x;
153 switch (ev->button) {
159 if (ev_pos == grab_start) {
161 /* no motion - just a click */
163 if (ev->state & Keyboard::TertiaryModifier) {
164 adjustment.set_value (default_value);
165 } else if (ev->state & fine_scale_modifier) {
166 adjustment.set_value (adjustment.get_lower());
167 } else if ((_orien == VERT && ev_pos < span - display_span()) || (_orien == HORIZ && ev_pos > span - display_span())) {
168 /* above the current display height, remember X Window coords */
169 adjustment.set_value (adjustment.get_value() + adjustment.get_step_increment());
171 adjustment.set_value (adjustment.get_value() - adjustment.get_step_increment());
183 fract = 1.0 - (ev_pos / span); // inverted X Window coordinates, grrr
185 fract = min (1.0, fract);
186 fract = max (0.0, fract);
188 adjustment.set_value (fract * (adjustment.get_upper() - adjustment.get_lower()));
200 PixFader::on_scroll_event (GdkEventScroll* ev)
205 if (ev->state & fine_scale_modifier) {
206 if (ev->state & extra_fine_scale_modifier) {
215 if (_orien == VERT) {
217 /* should left/right scroll affect vertical faders ? */
219 switch (ev->direction) {
222 adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
225 case GDK_SCROLL_DOWN:
226 adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
234 /* up/down scrolls should definitely affect horizontal faders
235 because they are so much easier to use
238 switch (ev->direction) {
240 case GDK_SCROLL_RIGHT:
242 adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
245 case GDK_SCROLL_LEFT:
246 case GDK_SCROLL_DOWN:
247 adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
258 PixFader::on_motion_notify_event (GdkEventMotion* ev)
262 double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
264 if (ev->window != grab_window) {
266 grab_window = ev->window;
270 if (ev->state & fine_scale_modifier) {
271 if (ev->state & extra_fine_scale_modifier) {
278 double const delta = ev_pos - grab_loc;
281 double fract = (delta / span);
283 fract = min (1.0, fract);
284 fract = max (-1.0, fract);
286 // X Window is top->bottom for 0..Y
288 if (_orien == VERT) {
292 adjustment.set_value (adjustment.get_value() + scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
299 PixFader::adjustment_changed ()
301 if (display_span() != last_drawn) {
306 /** @return pixel offset of the current value from the right or bottom of the fader */
308 PixFader::display_span ()
310 float fract = (adjustment.get_upper() - adjustment.get_value ()) / ((adjustment.get_upper() - adjustment.get_lower()));
311 return (_orien == VERT) ? (int)floor (span * (1.0 - fract)) : (int)floor (span * fract);
315 PixFader::set_fader_length (int l)
317 if (_orien == VERT) {
318 view.height = span = l;
319 unity_loc = (int) rint (view.height - (default_value * view.height)) - 1;
321 view.width = span = l;
322 unity_loc = (int) rint (default_value * view.width) - 1;
329 PixFader::on_enter_notify_event (GdkEventCrossing*)
331 Keyboard::magic_widget_grab_focus ();
336 PixFader::on_leave_notify_event (GdkEventCrossing*)
338 Keyboard::magic_widget_drop_focus();