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livetrax/libs/gtkmm2ext/pixfader.cc
Ben Loftis d439e93b1e Standardize drawing of PixFader and BarController; implement flat_buttons and prelight. 
Prepare for using Controllable interfaces, instead of passing in Adjustments.
ToDo:  reimplement image caching in a standardized way across widgets
2014-08-27 11:58:09 -05:00

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/*
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.
$Id: fastmeter.h 570 2006-06-07 21:21:21Z sampo $
*/
#include <iostream>
#include "pbd/stacktrace.h"
#include "gtkmm2ext/pixfader.h"
#include "gtkmm2ext/keyboard.h"
#include "gtkmm2ext/rgb_macros.h"
#include "gtkmm2ext/utils.h"
#include "gtkmm2ext/cairo_widget.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
PixFader::PixFader (Gtk::Adjustment& adj, int orientation, int fader_length, int fader_girth)
: adjustment (adj)
, span (fader_length)
, girth (fader_girth)
, _orien (orientation)
, _hovering (false)
, last_drawn (-1)
, dragging (false)
{
bg_gradient = 0;
fg_gradient = 0;
default_value = adjustment.get_value();
update_unity_position ();
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, &PixFader::adjustment_changed));
adjustment.signal_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
if (_orien == VERT) {
DrawingArea::set_size_request(girth, span);
} else {
DrawingArea::set_size_request(span, girth);
}
}
PixFader::~PixFader ()
{
}
bool
PixFader::on_expose_event (GdkEventExpose* ev)
{
Cairo::RefPtr<Cairo::Context> context = get_window()->create_cairo_context();
cairo_t* cr = context->cobj();
Gdk::Color fg_col = get_style()->get_fg (get_state());
float ds = display_span ();
float w = get_width();
float h = get_height();
//fill in the bg rect ...
Gdk::Color c = get_style()->get_bg (Gtk::STATE_PRELIGHT); //why prelight? Shouldn't we be using the parent's color?
CairoWidget::set_source_rgb_a (cr, c);
cairo_rectangle (cr, 0, 0, w, h);
cairo_fill(cr);
//"slot"
cairo_set_source_rgba (cr, 0.17, 0.17, 0.17, 1.0);
Gtkmm2ext::rounded_rectangle (cr, 1, 1, w-2, h-2, CORNER_RADIUS-0.5);
cairo_fill(cr);
//mask off the corners
Gtkmm2ext::rounded_rectangle (cr, 1, 1, w-2, h-2, CORNER_RADIUS-0.5);
cairo_clip(cr);
if (_orien == VERT) {
int travel = h - 1;
int progress = travel * (1.0-ds);
int top = 1 + progress;
int bottom = h;
//background gradient
if ( !CairoWidget::flat_buttons() ) {
cairo_pattern_t *bg_gradient = cairo_pattern_create_linear (0.0, 0.0, w, 0);
cairo_pattern_add_color_stop_rgba (bg_gradient, 0, 0, 0, 0, 0.4);
cairo_pattern_add_color_stop_rgba (bg_gradient, 0.2, 0, 0, 0, 0.2);
cairo_pattern_add_color_stop_rgba (bg_gradient, 1, 0, 0, 0, 0.0);
cairo_set_source (cr, bg_gradient);
Gtkmm2ext::rounded_rectangle (cr, 1, 1, w-2, h-2, CORNER_RADIUS-1.5);
cairo_fill (cr);
cairo_pattern_destroy(bg_gradient);
}
//fg color
CairoWidget::set_source_rgb_a (cr, fg_col, 1.0);
Gtkmm2ext::rounded_top_rectangle (cr, 1, top, w-2, bottom, CORNER_RADIUS - 1.5);
cairo_fill(cr);
//fg gradient
if (!CairoWidget::flat_buttons() ) {
cairo_pattern_t *fg_gradient = cairo_pattern_create_linear (0.0, 0.0, w, 0);
cairo_pattern_add_color_stop_rgba (fg_gradient, 0, 0, 0, 0, 0.0);
cairo_pattern_add_color_stop_rgba (fg_gradient, 0.1, 0, 0, 0, 0.0);
cairo_pattern_add_color_stop_rgba (fg_gradient, 1, 0, 0, 0, 0.3);
cairo_set_source (cr, fg_gradient);
Gtkmm2ext::rounded_rectangle (cr, 1, top, w-2, bottom, CORNER_RADIUS - 1.5);
cairo_fill (cr);
cairo_pattern_destroy(fg_gradient);
}
} else {
int travel = w - 1;
int progress = travel * ds;
int left = 1;
int length = progress;
//background gradient
if ( !CairoWidget::flat_buttons() ) {
cairo_pattern_t *bg_gradient = cairo_pattern_create_linear (0.0, 0.0, 0, h);
cairo_pattern_add_color_stop_rgba (bg_gradient, 0, 0, 0, 0, 0.4);
cairo_pattern_add_color_stop_rgba (bg_gradient, 0.2, 0, 0, 0, 0.2);
cairo_pattern_add_color_stop_rgba (bg_gradient, 1, 0, 0, 0, 0.0);
cairo_set_source (cr, bg_gradient);
Gtkmm2ext::rounded_rectangle (cr, 1, 1, w-2, h-2, CORNER_RADIUS-1.5);
cairo_fill (cr);
cairo_pattern_destroy(bg_gradient);
}
//fg color
CairoWidget::set_source_rgb_a (cr, fg_col, 1.0);
Gtkmm2ext::rounded_rectangle (cr, left, 1, length, h-2, CORNER_RADIUS - 1.5);
cairo_fill(cr);
//fg gradient
if (!CairoWidget::flat_buttons() ) {
cairo_pattern_t * fg_gradient = cairo_pattern_create_linear (0.0, 0.0, 0, h);
cairo_pattern_add_color_stop_rgba (fg_gradient, 0, 0, 0, 0, 0.0);
cairo_pattern_add_color_stop_rgba (fg_gradient, 0.1, 0, 0, 0, 0.0);
cairo_pattern_add_color_stop_rgba (fg_gradient, 1, 0, 0, 0, 0.3);
cairo_set_source (cr, fg_gradient);
Gtkmm2ext::rounded_rectangle (cr, left, 1, length, h-2, CORNER_RADIUS - 1.5);
cairo_fill (cr);
cairo_pattern_destroy(fg_gradient);
}
}
cairo_reset_clip(cr);
//black border
cairo_set_line_width (cr, 1.0);
cairo_set_source_rgba (cr, 0, 0, 0, 1.0);
Gtkmm2ext::rounded_rectangle (cr, 0.5, 0.5, w-1, h-1, CORNER_RADIUS);
cairo_stroke(cr);
/* draw the unity-position line if it's not at either end*/
if (unity_loc > 0) {
context->set_line_width (1);
Gdk::Color c = get_style()->get_fg (Gtk::STATE_ACTIVE);
CairoWidget::set_source_rgb_a (cr, c, 1.0);
if ( _orien == VERT) {
if (unity_loc < h ) {
context->move_to (2.5, unity_loc + CORNER_OFFSET + .5);
context->line_to (girth-2.5, unity_loc + CORNER_OFFSET + .5);
context->stroke ();
}
} else {
if ( unity_loc < w ){
context->move_to (unity_loc - CORNER_OFFSET + .5, 3.5);
context->line_to (unity_loc - CORNER_OFFSET + .5, girth-3.5);
context->stroke ();
}
}
}
//draw text
if ( !_text.empty() ) {
//calc text size
if ( !_text.empty()) {
_layout->get_pixel_size (_text_width, _text_height);
} else {
_text_width = 0;
_text_height = 0;
}
/* center text */
cairo_new_path (cr);
cairo_move_to (cr, (get_width() - _text_width)/2.0, get_height()/2.0 - _text_height/2.0);
Gdk::Color c = get_style()->get_text (get_state());
CairoWidget::set_source_rgb_a (cr, c, 0.9);
pango_cairo_show_layout (cr, _layout->gobj());
}
if (!get_sensitive()) {
Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, CORNER_OFFSET, w-CORNER_SIZE, h-CORNER_SIZE, CORNER_RADIUS);
cairo_set_source_rgba (cr, 0.505, 0.517, 0.525, 0.4);
cairo_fill (cr);
} else if (_hovering) {
Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, CORNER_OFFSET, w-CORNER_SIZE, h-CORNER_SIZE, CORNER_RADIUS);
cairo_set_source_rgba (cr, 0.905, 0.917, 0.925, 0.1);
cairo_fill (cr);
}
last_drawn = ds;
return true;
}
void
PixFader::on_size_request (GtkRequisition* req)
{
if (_orien == VERT) {
req->width = (girth ? girth : -1);
req->height = (span ? span : -1);
} else {
req->height = (girth ? girth : -1);
req->width = (span ? span : -1);
}
}
void
PixFader::on_size_allocate (Gtk::Allocation& alloc)
{
DrawingArea::on_size_allocate(alloc);
if (_orien == VERT) {
girth = alloc.get_width ();
span = alloc.get_height ();
} else {
girth = alloc.get_height ();
span = alloc.get_width ();
}
update_unity_position ();
}
bool
PixFader::on_button_press_event (GdkEventButton* ev)
{
if (ev->type != GDK_BUTTON_PRESS) {
return true;
}
if (ev->button != 1 && ev->button != 2) {
return false;
}
add_modal_grab ();
grab_loc = (_orien == VERT) ? ev->y : ev->x;
grab_start = (_orien == VERT) ? ev->y : ev->x;
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);
if (ev->button == 2) {
set_adjustment_from_event (ev);
}
return true;
}
bool
PixFader::on_button_release_event (GdkEventButton* ev)
{
double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
switch (ev->button) {
case 1:
if (dragging) {
remove_modal_grab();
dragging = false;
gdk_pointer_ungrab (GDK_CURRENT_TIME);
if (!_hovering) {
Keyboard::magic_widget_drop_focus();
queue_draw ();
}
if (ev_pos == grab_start) {
/* no motion - just a click */
if (ev->state & Keyboard::TertiaryModifier) {
adjustment.set_value (default_value);
} else if (ev->state & Keyboard::GainFineScaleModifier) {
adjustment.set_value (adjustment.get_lower());
} else if ((_orien == VERT && ev_pos < display_span()) || (_orien == HORIZ && ev_pos > display_span())) {
/* above the current display height, remember X Window coords */
adjustment.set_value (adjustment.get_value() + adjustment.get_step_increment());
} else {
adjustment.set_value (adjustment.get_value() - adjustment.get_step_increment());
}
}
return true;
}
break;
case 2:
if (dragging) {
remove_modal_grab();
dragging = false;
set_adjustment_from_event (ev);
gdk_pointer_ungrab (GDK_CURRENT_TIME);
return true;
}
break;
default:
break;
}
return false;
}
bool
PixFader::on_scroll_event (GdkEventScroll* ev)
{
double scale;
bool ret = false;
if (ev->state & Keyboard::GainFineScaleModifier) {
if (ev->state & Keyboard::GainExtraFineScaleModifier) {
scale = 0.01;
} else {
scale = 0.05;
}
} else {
scale = 0.25;
}
if (_orien == VERT) {
/* should left/right scroll affect vertical faders ? */
switch (ev->direction) {
case GDK_SCROLL_UP:
adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
ret = true;
break;
case GDK_SCROLL_DOWN:
adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
ret = true;
break;
default:
break;
}
} else {
/* up/down scrolls should definitely affect horizontal faders
because they are so much easier to use
*/
switch (ev->direction) {
case GDK_SCROLL_RIGHT:
case GDK_SCROLL_UP:
adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
ret = true;
break;
case GDK_SCROLL_LEFT:
case GDK_SCROLL_DOWN:
adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
ret = true;
break;
default:
break;
}
}
return ret;
}
bool
PixFader::on_motion_notify_event (GdkEventMotion* ev)
{
if (dragging) {
double scale = 1.0;
double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
if (ev->window != grab_window) {
grab_loc = ev_pos;
grab_window = ev->window;
return true;
}
if (ev->state & Keyboard::GainFineScaleModifier) {
if (ev->state & Keyboard::GainExtraFineScaleModifier) {
scale = 0.05;
} else {
scale = 0.1;
}
}
double const delta = ev_pos - grab_loc;
grab_loc = ev_pos;
double fract = (delta / span);
fract = min (1.0, fract);
fract = max (-1.0, fract);
// X Window is top->bottom for 0..Y
if (_orien == VERT) {
fract = -fract;
}
adjustment.set_value (adjustment.get_value() + scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
}
return true;
}
void
PixFader::adjustment_changed ()
{
if (display_span() != last_drawn) {
queue_draw ();
}
}
/** @return pixel offset of the current value from the right or bottom of the fader */
float
PixFader::display_span ()
{
float fract = (adjustment.get_value () - adjustment.get_lower()) / ((adjustment.get_upper() - adjustment.get_lower()));
return fract;
}
void
PixFader::update_unity_position ()
{
if (_orien == VERT) {
unity_loc = (int) rint (span * (1 - ((default_value - adjustment.get_lower()) / (adjustment.get_upper() - adjustment.get_lower())))) - 1;
} else {
unity_loc = (int) rint ((default_value - adjustment.get_lower()) * span / (adjustment.get_upper() - adjustment.get_lower()));
}
queue_draw ();
}
bool
PixFader::on_enter_notify_event (GdkEventCrossing*)
{
_hovering = true;
Keyboard::magic_widget_grab_focus ();
queue_draw ();
return false;
}
bool
PixFader::on_leave_notify_event (GdkEventCrossing*)
{
if (!dragging) {
_hovering = false;
Keyboard::magic_widget_drop_focus();
queue_draw ();
}
return false;
}
void
PixFader::set_adjustment_from_event (GdkEventButton* ev)
{
double fract = (_orien == VERT) ? (1.0 - (ev->y / span)) : (ev->x / span);
fract = min (1.0, fract);
fract = max (0.0, fract);
adjustment.set_value (fract * (adjustment.get_upper () - adjustment.get_lower ()));
}
void
PixFader::set_default_value (float d)
{
default_value = d;
update_unity_position ();
}
void
PixFader::set_text (const std::string& str)
{
_text = str;
if (!_layout && !_text.empty()) {
_layout = Pango::Layout::create (get_pango_context());
}
if (_layout) {
_layout->set_text (str);
_layout->get_pixel_size (_text_width, _text_height);
}
queue_resize ();
}
void
PixFader::on_state_changed (Gtk::StateType old_state)
{
Widget::on_state_changed (old_state);
queue_draw ();
}
void
PixFader::on_style_changed (const Glib::RefPtr<Gtk::Style>&)
{
if (_layout) {
std::string txt = _layout->get_text();
_layout.clear (); // drop reference to existing layout
set_text (txt);
}
queue_draw ();
}
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