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"
25 #include "gtkmm2ext/rgb_macros.h"
27 using namespace Gtkmm2ext;
31 PixFader::PixFader (Glib::RefPtr<Gdk::Pixbuf> belt, Gtk::Adjustment& adj, int orientation, int fader_length)
40 default_value = adjustment.get_value();
46 if (orientation == VERT) {
47 view.width = girth = pixbuf->get_width();
49 view.height = girth = pixbuf->get_height();
52 set_fader_length (fader_length);
54 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);
56 adjustment.signal_value_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
57 adjustment.signal_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
59 if (pixbuf->get_has_alpha()) {
60 format = Cairo::FORMAT_ARGB32;
62 format = Cairo::FORMAT_RGB24;
64 belt_surface = Cairo::ImageSurface::create (format, pixbuf->get_width(), pixbuf->get_height());
65 belt_context = Cairo::Context::create (belt_surface);
66 Gdk::Cairo::set_source_pixbuf (belt_context, pixbuf, 0.0, 0.0);
67 belt_context->paint();
78 PixFader::~PixFader ()
83 PixFader::set_border_colors (uint32_t left, uint32_t right)
86 UINT_TO_RGB(left, &r, &g, &b);
90 UINT_TO_RGB(right, &r, &g, &b);
97 PixFader::on_expose_event (GdkEventExpose* ev)
99 Cairo::RefPtr<Cairo::Context> context = get_window()->create_cairo_context();
101 int const ds = display_span ();
102 int offset_into_pixbuf = (int) floor (span / ((float) span / ds));
104 /* account for fader lengths that are shorter than the fader pixbuf */
105 if (_orien == VERT) {
106 offset_into_pixbuf += pixbuf->get_height() / 2 - view.height;
108 offset_into_pixbuf += pixbuf->get_width() / 2 - view.width;
111 context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
114 if (_orien == VERT) {
116 srcy = offset_into_pixbuf;
118 srcx = offset_into_pixbuf;
125 context->set_source (belt_surface, -srcx, -srcy);
126 context->rectangle (0, 0, get_width(), get_height());
131 /* bounding box lines (2 colors for nicer visuals) */
133 /* top and left side */
135 context->set_line_width (1);
136 context->set_source_rgb (left_r, left_g, left_b);
137 context->move_to (view.width - 1, 0); /* upper right */
138 context->line_to (0, 0); /* upper left */
139 context->line_to (0, view.height - 1);/* lower left */
142 /* bottom & right side */
144 context->set_line_width (1);
145 context->set_source_rgb (right_r, right_g, right_b);
146 context->move_to (0, view.height - 0.5); /* lower left */
147 context->line_to (view.width - 0.5, view.height - 0.5); /* lower right */
148 context->line_to (view.width - 0.5, 0); /* upper right */
151 /* always draw the unity-position line */
154 if (_orien == VERT) {
155 context->set_line_width (1);
156 context->set_source_rgb (0.0, 1.0, 0.0);
157 context->move_to (1, unity_loc);
158 context->line_to (girth, unity_loc);
161 context->set_line_width (1);
162 context->set_source_rgb (0.0, 1.0, 0.0);
163 context->move_to (unity_loc, 1);
164 context->line_to (unity_loc, girth - 1);
174 PixFader::on_size_request (GtkRequisition* req)
176 req->width = view.width;
177 req->height = view.height;
181 PixFader::on_button_press_event (GdkEventButton* ev)
183 if (ev->type != GDK_BUTTON_PRESS) {
187 if (ev->button != 1 && ev->button != 2) {
192 grab_loc = (_orien == VERT) ? ev->y : ev->x;
193 grab_start = (_orien == VERT) ? ev->y : ev->x;
194 grab_window = ev->window;
197 if (ev->button == 2) {
198 set_adjustment_from_event (ev);
205 PixFader::on_button_release_event (GdkEventButton* ev)
207 double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
209 switch (ev->button) {
215 if (ev_pos == grab_start) {
217 /* no motion - just a click */
219 if (ev->state & Keyboard::TertiaryModifier) {
220 adjustment.set_value (default_value);
221 } else if (ev->state & Keyboard::GainFineScaleModifier) {
222 adjustment.set_value (adjustment.get_lower());
223 } else if ((_orien == VERT && ev_pos < span - display_span()) || (_orien == HORIZ && ev_pos > span - display_span())) {
224 /* above the current display height, remember X Window coords */
225 adjustment.set_value (adjustment.get_value() + adjustment.get_step_increment());
227 adjustment.set_value (adjustment.get_value() - adjustment.get_step_increment());
238 set_adjustment_from_event (ev);
250 PixFader::on_scroll_event (GdkEventScroll* ev)
255 if (ev->state & Keyboard::GainFineScaleModifier) {
256 if (ev->state & Keyboard::GainExtraFineScaleModifier) {
265 if (_orien == VERT) {
267 /* should left/right scroll affect vertical faders ? */
269 switch (ev->direction) {
272 adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
275 case GDK_SCROLL_DOWN:
276 adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
284 /* up/down scrolls should definitely affect horizontal faders
285 because they are so much easier to use
288 switch (ev->direction) {
290 case GDK_SCROLL_RIGHT:
292 adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
295 case GDK_SCROLL_LEFT:
296 case GDK_SCROLL_DOWN:
297 adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
308 PixFader::on_motion_notify_event (GdkEventMotion* ev)
312 double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
314 if (ev->window != grab_window) {
316 grab_window = ev->window;
320 if (ev->state & Keyboard::GainFineScaleModifier) {
321 if (ev->state & Keyboard::GainExtraFineScaleModifier) {
328 double const delta = ev_pos - grab_loc;
331 double fract = (delta / span);
333 fract = min (1.0, fract);
334 fract = max (-1.0, fract);
336 // X Window is top->bottom for 0..Y
338 if (_orien == VERT) {
342 adjustment.set_value (adjustment.get_value() + scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
349 PixFader::adjustment_changed ()
351 if (display_span() != last_drawn) {
356 /** @return pixel offset of the current value from the right or bottom of the fader */
358 PixFader::display_span ()
360 float fract = (adjustment.get_value () - adjustment.get_lower()) / ((adjustment.get_upper() - adjustment.get_lower()));
361 return (_orien != VERT) ? (int)floor (span * (1.0 - fract)) : (int)floor (span * fract);
365 PixFader::set_fader_length (int l)
367 if (_orien == VERT) {
368 view.height = span = l;
370 view.width = span = l;
373 update_unity_position ();
379 PixFader::update_unity_position ()
381 if (_orien == VERT) {
382 unity_loc = (int) rint (view.height * (1 - (default_value / (adjustment.get_upper() - adjustment.get_lower())))) - 1;
384 unity_loc = (int) rint (default_value * view.width);
391 PixFader::on_enter_notify_event (GdkEventCrossing*)
393 Keyboard::magic_widget_grab_focus ();
398 PixFader::on_leave_notify_event (GdkEventCrossing*)
400 Keyboard::magic_widget_drop_focus();
405 PixFader::set_adjustment_from_event (GdkEventButton* ev)
407 double fract = (_orien == VERT) ? (1.0 - (ev->y / span)) : (ev->x / span);
409 fract = min (1.0, fract);
410 fract = max (0.0, fract);
412 adjustment.set_value (fract * (adjustment.get_upper () - adjustment.get_lower ()));
416 PixFader::set_default_value (float d)
419 update_unity_position ();