add fader implementation from Tracks

2 files changed, 541 insertions, 0 deletions

diff --git a/libs/gtkmm2ext/fader.cc b/libs/gtkmm2ext/fader.cc
new file mode 100755
index 0000000000..a4583bb189
--- /dev/null
+++ b/libs/gtkmm2ext/fader.cc
@@ -0,0 +1,430 @@
+/*
+    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;
+    
+    // The vector perpendicular to a_to_b;
+    // This step can also be combined with the next
+	double perpendicular_x = -a_to_b_y;
+	double perpendicular_y = a_to_b_x;
+
+    // Finding Q, the point "in the right direction"
+    // If you want a mess, you can also combine this
+    // with the next step.
+	double xq = xp + perpendicular_x;
+	double yq = yp + perpendicular_y;
+
+    // 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)
+	, _default_value (adjustment.get_value())
+	, _dragging (false)
+	, _read_only (read_only)
+	, _grab_window (0)
+	, _touch_cursor (0)
+{
+	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::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*)
+{
+	get_handle_position (_last_drawn_x, _last_drawn_y);
+
+	if (_underlay_pixbuf != 0) {
+	    cairo_rectangle (cr, 0, 0, get_width(), get_height());
+		gdk_cairo_set_source_pixbuf (cr,
+									 _underlay_pixbuf->gobj(),
+									 _last_drawn_x - (int)(_underlay_pixbuf->get_width()/2.0 + 0.5),
+									 _last_drawn_y - (int)(_underlay_pixbuf->get_height()/2.0 + 0.5));
+	    cairo_fill (cr);
+	}
+
+	cairo_rectangle (cr, 0, 0, get_width(), get_height());
+	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_fill (cr);
+
+    cairo_rectangle (cr, 0, 0, get_width(), get_height());
+	if (_dragging) {
+		gdk_cairo_set_source_pixbuf (cr,
+									 _active_handle_pixbuf->gobj(),
+									 _last_drawn_x - (int)(_active_handle_pixbuf->get_width()/2.0 + 0.5),
+									 _last_drawn_y - (int)(_active_handle_pixbuf->get_height()/2.0 + 0.5));
+	} else {
+		gdk_cairo_set_source_pixbuf (cr,
+									 _handle_pixbuf->gobj(),
+									 _last_drawn_x - (int)(_handle_pixbuf->get_width()/2.0 + 0.5),
+									 _last_drawn_y - (int)(_handle_pixbuf->get_height()/2.0 + 0.5));
+	}
+    cairo_fill (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 hw = _handle_pixbuf->get_width();
+	double hh = _handle_pixbuf->get_height();
+
+	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((_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 ()
+{
+}
diff --git a/libs/gtkmm2ext/gtkmm2ext/fader.h b/libs/gtkmm2ext/gtkmm2ext/fader.h
new file mode 100755
index 0000000000..b91b21b922
--- /dev/null
+++ b/libs/gtkmm2ext/gtkmm2ext/fader.h
@@ -0,0 +1,111 @@
+/*
+    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.
+
+*/
+
+#ifndef __gtkmm2ext_fader_h__
+#define __gtkmm2ext_fader_h__
+
+#include <cmath>
+#include <stdint.h>
+
+#include <gtkmm/adjustment.h>
+#include <gdkmm.h>
+#include <gtkmm2ext/binding_proxy.h>
+#include "gtkmm2ext/cairo_widget.h"
+
+#include <boost/shared_ptr.hpp>
+
+#include "gtkmm2ext/visibility.h"
+
+namespace Gtkmm2ext {
+
+class LIBGTKMM2EXT_API Fader : public CairoWidget
+{
+  public:
+        Fader (Gtk::Adjustment& adjustment, 
+			   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);
+
+	virtual ~Fader ();
+
+	void set_controllable (boost::shared_ptr<PBD::Controllable> c) { binding_proxy.set_controllable (c); }
+	void set_default_value (float);
+	void set_touch_cursor (const Glib::RefPtr<Gdk::Pixbuf>& touch_cursor);
+
+  protected:
+	void get_handle_position (double& x, double& y);
+
+	void on_size_request (GtkRequisition*);
+	void on_size_allocate (Gtk::Allocation& alloc);
+
+	void render (cairo_t* cr, cairo_rectangle_t*);
+	bool on_button_press_event (GdkEventButton*);
+	bool on_button_release_event (GdkEventButton*);
+	bool on_motion_notify_event (GdkEventMotion*);
+	bool on_scroll_event (GdkEventScroll* ev);
+	bool on_enter_notify_event (GdkEventCrossing* ev);
+	bool on_leave_notify_event (GdkEventCrossing* ev);
+
+  protected:
+	Gtk::Adjustment& adjustment;
+	BindingProxy binding_proxy;
+
+  private:
+
+    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 _hovering;
+
+	GdkWindow* _grab_window;
+	Gdk::Cursor *_touch_cursor;
+
+	double _grab_start_mouse_x;
+	double _grab_start_mouse_y;
+	double _grab_start_handle_x;
+	double _grab_start_handle_y;
+	double _last_drawn_x;
+	double _last_drawn_y;
+	bool _dragging;
+	float _default_value;
+	int _unity_loc;
+	bool _read_only;
+
+	void adjustment_changed ();
+	void update_unity_position ();
+};
+
+
+} /* namespace */
+
+ #endif /* __gtkmm2ext_fader_h__ */