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-rwxr-xr-xlibs/gtkmm2ext/fader.cc448
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diff --git a/libs/gtkmm2ext/fader.cc b/libs/gtkmm2ext/fader.cc
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+/*
+ Copyright (C) 2014 Waves Audio Ltd.
+
+ 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 "pbd/stacktrace.h"
+
+#include "gtkmm2ext/fader.h"
+#include "gtkmm2ext/keyboard.h"
+#include "gtkmm2ext/rgb_macros.h"
+#include "gtkmm2ext/utils.h"
+#include "pbd/failed_constructor.h"
+#include "pbd/file_utils.h"
+#include "ardour/filesystem_paths.h"
+
+using namespace Gtkmm2ext;
+using namespace Gtk;
+using namespace std;
+
+#define CORNER_RADIUS 4
+#define CORNER_SIZE 2
+#define CORNER_OFFSET 1
+#define FADER_RESERVE 5
+
+
+static void get_closest_point_on_line(double xa, double ya, double xb, double yb, double xp, double yp, double& xl, double& yl )
+{
+ // Storing vector A->B
+ double a_to_b_x = xb - xa;
+ double a_to_b_y = yb - ya;
+
+ // Storing vector A->P
+ double a_to_p_x = xp - xa;
+ double a_to_p_y = yp - ya;
+
+
+ // Basically finding the squared magnitude
+ // of a_to_b
+ double atb2 = a_to_b_x * a_to_b_x + a_to_b_y * a_to_b_y;
+
+ // The dot product of a_to_p and a_to_b
+ double atp_dot_atb = a_to_p_x * a_to_b_x + a_to_p_y * a_to_b_y;
+
+ // The normalized "distance" from a to
+ // your closest point
+ double t = atp_dot_atb / atb2;
+
+ // Add the distance to A, moving
+ // towards B
+ double x = xa + a_to_b_x * t;
+ double y = ya + a_to_b_y * t;
+
+ if ((xa != xb)) {
+ if ((x < xa) && (x < xb)) {
+ if (xa < xb) {
+ x = xa;
+ y = ya;
+ } else {
+ x = xb;
+ y = yb;
+ }
+ } else if ((x > xa) && (x > xb)) {
+ if (xb > xa) {
+ x = xb;
+ y = yb;
+ } else {
+ x = xa;
+ y = ya;
+ }
+ }
+ } else {
+ if ((y < ya) && (y < yb)) {
+ if (ya < yb) {
+ x = xa;
+ y = ya;
+ } else {
+ x = xb;
+ y = yb;
+ }
+ } else if ((y > ya) && (y > yb)) {
+ if (yb > ya) {
+ x = xb;
+ y = yb;
+ } else {
+ x = xa;
+ y = ya;
+ }
+ }
+ }
+
+ xl = x;
+ yl = y;
+}
+
+Fader::Fader (Gtk::Adjustment& adj,
+ const Glib::RefPtr<Gdk::Pixbuf>& face_pixbuf,
+ const Glib::RefPtr<Gdk::Pixbuf>& active_face_pixbuf,
+ const Glib::RefPtr<Gdk::Pixbuf>& underlay_pixbuf,
+ const Glib::RefPtr<Gdk::Pixbuf>& handle_pixbuf,
+ const Glib::RefPtr<Gdk::Pixbuf>& active_handle_pixbuf,
+ int min_pos_x,
+ int min_pos_y,
+ int max_pos_x,
+ int max_pos_y,
+ bool read_only)
+ : adjustment (adj)
+ , _face_pixbuf (face_pixbuf)
+ , _active_face_pixbuf (active_face_pixbuf)
+ , _underlay_pixbuf (underlay_pixbuf)
+ , _handle_pixbuf (handle_pixbuf)
+ , _active_handle_pixbuf (active_handle_pixbuf)
+ , _min_pos_x (min_pos_x)
+ , _min_pos_y (min_pos_y)
+ , _max_pos_x (max_pos_x)
+ , _max_pos_y (max_pos_y)
+ , _grab_window (0)
+ , _touch_cursor (0)
+ , _dragging (false)
+ , _default_value (adjustment.get_value())
+ , _read_only (read_only)
+{
+ update_unity_position ();
+
+ if (!_read_only) {
+ 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);
+ }
+
+ adjustment.signal_value_changed().connect (mem_fun (*this, &Fader::adjustment_changed));
+ adjustment.signal_changed().connect (mem_fun (*this, &Fader::adjustment_changed));
+ CairoWidget::set_size_request(_face_pixbuf->get_width(), _face_pixbuf->get_height());
+}
+
+Fader::~Fader ()
+{
+ if (_touch_cursor) {
+ delete _touch_cursor;
+ }
+}
+
+void
+Fader::get_image_scales (double &x_scale, double &y_scale)
+{
+ int pbwidth = _face_pixbuf->get_width ();
+ int pbheight = _face_pixbuf->get_height ();
+ int width = get_width ();
+ int height = get_height ();
+
+ if ((width != pbwidth) || (height != pbheight)) {
+ x_scale = double (width) / double (pbwidth);
+ if (x_scale == 0.0) {
+ x_scale = 1.0;
+ }
+ y_scale = double (height) / double (pbheight);
+ if (y_scale == 0.0) {
+ y_scale = 1.0;
+ }
+ } else {
+ x_scale = y_scale = 1.0;
+ }
+}
+
+void
+Fader::set_touch_cursor (const Glib::RefPtr<Gdk::Pixbuf>& touch_cursor)
+{
+ _touch_cursor = new Gdk::Cursor (Gdk::Display::get_default(), touch_cursor, 12, 12);
+}
+
+void
+Fader::render (cairo_t* cr, cairo_rectangle_t*)
+{
+
+ double xscale = 1.0;
+ double yscale = 1.0;
+
+ get_image_scales (xscale, yscale);
+
+ cairo_matrix_t matrix;
+ cairo_get_matrix (cr, &matrix);
+ cairo_matrix_scale (&matrix, xscale, yscale);
+ cairo_set_matrix (cr, &matrix);
+
+ get_handle_position (_last_drawn_x, _last_drawn_y);
+
+ if (_underlay_pixbuf != 0) {
+ gdk_cairo_set_source_pixbuf (cr,
+ _underlay_pixbuf->gobj(),
+ (_last_drawn_x - (int)((_underlay_pixbuf->get_width() * xscale) / 2.0 + 0.5)) / xscale,
+ (_last_drawn_y - (int)((_underlay_pixbuf->get_height() * yscale) / 2.0 + 0.5)) / yscale);
+ cairo_paint (cr);
+ }
+
+ gdk_cairo_set_source_pixbuf (cr,
+ ((get_state () == Gtk::STATE_ACTIVE) && (_active_face_pixbuf != 0)) ?
+ _active_face_pixbuf->gobj() :
+ _face_pixbuf->gobj(),
+ 0,
+ 0);
+ cairo_paint (cr);
+
+ const Glib::RefPtr<Gdk::Pixbuf> handle_pixbuf (_dragging ? _active_handle_pixbuf : _handle_pixbuf);
+ gdk_cairo_set_source_pixbuf (cr,
+ handle_pixbuf->gobj(),
+ (_last_drawn_x - (int)((handle_pixbuf->get_width() * xscale) / 2.0 + 0.5)) / xscale,
+ (_last_drawn_y - (int)((handle_pixbuf->get_height() * yscale) / 2.0 + 0.5)) / yscale);
+ cairo_paint (cr);
+}
+
+void
+Fader::on_size_request (GtkRequisition* req)
+{
+ req->width = _face_pixbuf->get_width();
+ req->height = _face_pixbuf->get_height();
+}
+
+void
+Fader::on_size_allocate (Gtk::Allocation& alloc)
+{
+ CairoWidget::on_size_allocate(alloc);
+ update_unity_position ();
+}
+
+bool
+Fader::on_button_press_event (GdkEventButton* ev)
+{
+ focus_handler();
+
+ if (_read_only) {
+ return false;
+ }
+
+ if (ev->type != GDK_BUTTON_PRESS) {
+ return false;
+ }
+
+ if (ev->button != 1 && ev->button != 2) {
+ return false;
+ }
+
+ if (_touch_cursor) {
+ get_window()->set_cursor (*_touch_cursor);
+ }
+
+ _grab_start_mouse_x = ev->x;
+ _grab_start_mouse_y = ev->y;
+ get_handle_position (_grab_start_handle_x, _grab_start_handle_y);
+
+ double xscale = 1.0;
+ double yscale = 1.0;
+
+ get_image_scales (xscale, yscale);
+
+ double hw = _handle_pixbuf->get_width() * xscale;
+ double hh = _handle_pixbuf->get_height() * yscale;
+
+ if ((ev->x < (_grab_start_handle_x - hw/2)) || (ev->x > (_grab_start_handle_x + hw/2)) || (ev->y < (_grab_start_handle_y - hh/2)) || (ev->y > (_grab_start_handle_y + hh/2))) {
+ return false;
+ }
+
+ double ev_pos_x;
+ double ev_pos_y;
+
+ get_closest_point_on_line(_min_pos_x, _min_pos_y,
+ _max_pos_x, _max_pos_y,
+ ev->x, ev->y,
+ ev_pos_x, ev_pos_y );
+ add_modal_grab ();
+
+ _grab_window = ev->window;
+ _dragging = true;
+
+ gdk_pointer_grab(ev->window,false,
+ GdkEventMask (Gdk::POINTER_MOTION_MASK | Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK),
+ NULL,
+ NULL,
+ ev->time);
+
+ queue_draw();
+
+ return true;
+}
+
+bool
+Fader::on_button_release_event (GdkEventButton* ev)
+{
+ if (_read_only) {
+ return false;
+ }
+
+ if (_touch_cursor) {
+ get_window()->set_cursor ();
+ }
+
+ if (_dragging) { //temp
+ remove_modal_grab();
+ _dragging = false;
+ gdk_pointer_ungrab (GDK_CURRENT_TIME);
+ queue_draw ();
+ }
+ return false;
+}
+
+bool
+Fader::on_scroll_event (GdkEventScroll* ev)
+{
+ if (_read_only) {
+ return false;
+ }
+
+ int step_factor = 1;
+
+ switch (ev->direction) {
+ case GDK_SCROLL_RIGHT:
+ case GDK_SCROLL_UP:
+#ifdef __APPLE__
+ if ( ev->state & GDK_SHIFT_MASK ) {
+ step_factor = -1;
+ } else {
+ step_factor = 1;
+ }
+#else
+ step_factor = 1;
+#endif
+ break;
+ case GDK_SCROLL_LEFT:
+ case GDK_SCROLL_DOWN:
+#ifdef __APPLE__
+ if ( ev->state & GDK_SHIFT_MASK ) {
+ step_factor = 1;
+ } else {
+ step_factor = -1;
+ }
+#else
+ step_factor = -1;
+#endif
+ break;
+ default:
+ return false;
+ }
+ adjustment.set_value (adjustment.get_value() + step_factor * (adjustment.get_step_increment() ));
+ return true;
+}
+
+bool
+Fader::on_motion_notify_event (GdkEventMotion* ev)
+{
+ if (_read_only) {
+ return false;
+ }
+
+ if (_dragging) {
+ double ev_pos_x;
+ double ev_pos_y;
+
+ if (ev->window != _grab_window) {
+ _grab_window = ev->window;
+ return true;
+ }
+
+ get_closest_point_on_line(_min_pos_x, _min_pos_y,
+ _max_pos_x, _max_pos_y,
+ _grab_start_handle_x + (ev->x - _grab_start_mouse_x), _grab_start_handle_y + (ev->y - _grab_start_mouse_y),
+ ev_pos_x, ev_pos_y );
+
+ double const fract = sqrt((ev_pos_x - _min_pos_x) * (ev_pos_x - _min_pos_x) +
+ (ev_pos_y - _min_pos_y) * (ev_pos_y - _min_pos_y)) /
+ sqrt((double)((_max_pos_x - _min_pos_x) * (_max_pos_x - _min_pos_x) +
+ (_max_pos_y - _min_pos_y) * (_max_pos_y - _min_pos_y)));
+
+ adjustment.set_value (adjustment.get_lower() + (adjustment.get_upper() - adjustment.get_lower()) * fract);
+ }
+ return true;
+}
+
+void
+Fader::adjustment_changed ()
+{
+ double handle_x;
+ double handle_y;
+ get_handle_position (handle_x, handle_y);
+
+ if ((handle_x != _last_drawn_x) || (handle_y != _last_drawn_y)) {
+ queue_draw ();
+ }
+}
+
+/** @return pixel offset of the current value from the right or bottom of the fader */
+void
+Fader::get_handle_position (double& x, double& y)
+{
+ double fract = (adjustment.get_value () - adjustment.get_lower()) / ((adjustment.get_upper() - adjustment.get_lower()));
+
+ x = (int)(_min_pos_x + (_max_pos_x - _min_pos_x) * fract);
+ y = (int)(_min_pos_y + (_max_pos_y - _min_pos_y) * fract);
+}
+
+bool
+Fader::on_enter_notify_event (GdkEventCrossing*)
+{
+ _hovering = true;
+ Keyboard::magic_widget_grab_focus ();
+ queue_draw ();
+ return false;
+}
+
+bool
+Fader::on_leave_notify_event (GdkEventCrossing*)
+{
+ if (_read_only) {
+ return false;
+ }
+
+ if (!_dragging) {
+ _hovering = false;
+ Keyboard::magic_widget_drop_focus();
+ queue_draw ();
+ }
+ return false;
+}
+
+void
+Fader::set_default_value (float d)
+{
+ _default_value = d;
+ update_unity_position ();
+}
+
+void
+Fader::update_unity_position ()
+{
+}
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