13
0
livetrax/libs/gtkmm2ext/pixfader.cc

714 lines
18 KiB
C++

/*
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 <assert.h>
#include "pbd/stacktrace.h"
#include "gtkmm2ext/cairo_widget.h"
#include "gtkmm2ext/keyboard.h"
#include "gtkmm2ext/pixfader.h"
#include "gtkmm2ext/utils.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 6 // >= 1.5 * CORNER_RADIUS
std::list<PixFader::FaderImage*> PixFader::_patterns;
PixFader::PixFader (Gtk::Adjustment& adj, int orientation, int fader_length, int fader_girth)
: adjustment (adj)
, _span (fader_length)
, _girth (fader_girth)
, _min_span (fader_length)
, _min_girth (fader_girth)
, _orien (orientation)
, _pattern (0)
, _hovering (false)
, _last_drawn (-1)
, _dragging (false)
, _centered_text (true)
, _display_unity_line (true)
, _current_parent (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 ()
{
if (_parent_style_change) _parent_style_change.disconnect();
if (_layout) _layout.clear (); // drop reference to existing layout
}
cairo_pattern_t*
PixFader::find_pattern (double afr, double afg, double afb,
double abr, double abg, double abb,
int w, int h)
{
for (list<FaderImage*>::iterator f = _patterns.begin(); f != _patterns.end(); ++f) {
if ((*f)->matches (afr, afg, afb, abr, abg, abb, w, h)) {
return (*f)->pattern;
}
}
return 0;
}
void
PixFader::create_patterns ()
{
Gdk::Color c = get_style()->get_fg (get_state());
float fr, fg, fb;
float br, bg, bb;
fr = c.get_red_p ();
fg = c.get_green_p ();
fb = c.get_blue_p ();
c = get_style()->get_bg (get_state());
br = c.get_red_p ();
bg = c.get_green_p ();
bb = c.get_blue_p ();
cairo_surface_t* surface;
cairo_t* tc = 0;
if (get_width() <= 1 || get_height() <= 1) {
return;
}
if ((_pattern = find_pattern (fr, fg, fb, br, bg, bb, get_width(), get_height())) != 0) {
/* found it - use it */
return;
}
if (_orien == VERT) {
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, get_width(), get_height() * 2.0);
tc = cairo_create (surface);
/* paint background + border */
cairo_pattern_t* shade_pattern = cairo_pattern_create_linear (0.0, 0.0, get_width(), 0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 0, br*0.4,bg*0.4,bb*0.4, 1.0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 0.25, br*0.6,bg*0.6,bb*0.6, 1.0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 1, br*0.8,bg*0.8,bb*0.8, 1.0);
cairo_set_source (tc, shade_pattern);
cairo_rectangle (tc, 0, 0, get_width(), get_height() * 2.0);
cairo_fill (tc);
cairo_pattern_destroy (shade_pattern);
/* paint lower shade */
shade_pattern = cairo_pattern_create_linear (0.0, 0.0, get_width() - 2 - CORNER_OFFSET , 0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 0, fr*0.8,fg*0.8,fb*0.8, 1.0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 1, fr*0.6,fg*0.6,fb*0.6, 1.0);
cairo_set_source (tc, shade_pattern);
Gtkmm2ext::rounded_top_half_rectangle (tc, CORNER_OFFSET, get_height() + CORNER_OFFSET,
get_width() - CORNER_SIZE, get_height(), CORNER_RADIUS);
cairo_fill (tc);
cairo_pattern_destroy (shade_pattern);
_pattern = cairo_pattern_create_for_surface (surface);
} else {
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, get_width() * 2.0, get_height());
tc = cairo_create (surface);
/* paint right shade (background section)*/
cairo_pattern_t* shade_pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, get_height());
cairo_pattern_add_color_stop_rgba (shade_pattern, 0, br*0.4,bg*0.4,bb*0.4, 1.0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 0.25, br*0.6,bg*0.6,bb*0.6, 1.0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 1, br*0.8,bg*0.8,bb*0.8, 1.0);
cairo_set_source (tc, shade_pattern);
cairo_rectangle (tc, 0, 0, get_width() * 2.0, get_height());
cairo_fill (tc);
/* paint left shade (active section/foreground) */
shade_pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, get_height());
cairo_pattern_add_color_stop_rgba (shade_pattern, 0, fr*0.8,fg*0.8,fb*0.8, 1.0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 1, fr*0.6,fg*0.6,fb*0.6, 1.0);
cairo_set_source (tc, shade_pattern);
Gtkmm2ext::rounded_right_half_rectangle (tc, CORNER_OFFSET, CORNER_OFFSET,
get_width() - CORNER_OFFSET, get_height() - CORNER_SIZE, CORNER_RADIUS);
cairo_fill (tc);
cairo_pattern_destroy (shade_pattern);
_pattern = cairo_pattern_create_for_surface (surface);
}
/* cache it for others to use */
_patterns.push_back (new FaderImage (_pattern, fr, fg, fb, br, bg, bb, get_width(), get_height()));
cairo_destroy (tc);
cairo_surface_destroy (surface);
}
bool
PixFader::on_expose_event (GdkEventExpose* ev)
{
Cairo::RefPtr<Cairo::Context> context = get_window()->create_cairo_context();
cairo_t* cr = context->cobj();
// clip to expose area
cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
cairo_clip (cr);
if (!_pattern) {
create_patterns();
}
if (!_pattern) {
/* this isn't supposed to be happen, but some wackiness whereby
* the pixfader ends up with a 1xN or Nx1 size allocation
* leads to it. the basic wackiness needs fixing but we
* shouldn't crash. just fill in the expose area with
* our bg color.
*/
CairoWidget::set_source_rgb_a (cr, get_style()->get_bg (get_state()), 1);
cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
cairo_fill (cr);
return true;
}
OnExpose();
int ds = display_span ();
const float w = get_width();
const float h = get_height();
CairoWidget::set_source_rgb_a (cr, get_parent_bg(), 1);
cairo_rectangle (cr, 0, 0, w, h);
cairo_fill(cr);
cairo_set_line_width (cr, 2);
cairo_set_source_rgba (cr, 0, 0, 0, 1.0);
cairo_matrix_t matrix;
Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, CORNER_OFFSET, w-CORNER_SIZE, h-CORNER_SIZE, CORNER_RADIUS);
// we use a 'trick' here: The stoke is off by .5px but filling the interior area
// after a stroke of 2px width results in an outline of 1px
cairo_stroke_preserve(cr);
if (_orien == VERT) {
if (ds > h - FADER_RESERVE - CORNER_OFFSET) {
ds = h - FADER_RESERVE - CORNER_OFFSET;
}
if (!CairoWidget::flat_buttons() ) {
cairo_set_source (cr, _pattern);
cairo_matrix_init_translate (&matrix, 0, (h - ds));
cairo_pattern_set_matrix (_pattern, &matrix);
} else {
CairoWidget::set_source_rgb_a (cr, get_style()->get_bg (get_state()), 1);
cairo_fill (cr);
CairoWidget::set_source_rgb_a (cr, get_style()->get_fg (get_state()), 1);
Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, ds + CORNER_OFFSET,
w - CORNER_SIZE, h - ds - CORNER_SIZE, CORNER_RADIUS);
}
cairo_fill (cr);
} else {
if (ds < FADER_RESERVE) {
ds = FADER_RESERVE;
}
assert(ds <= w);
/*
* if ds == w, the pattern does not need to be translated
* if ds == 0 (or FADER_RESERVE), the pattern needs to be moved
* w to the left, which is -w in pattern space, and w in user space
* if ds == 10, then the pattern needs to be moved w - 10
* to the left, which is -(w-10) in pattern space, which
* is (w - 10) in user space
* thus: translation = (w - ds)
*/
if (!CairoWidget::flat_buttons() ) {
cairo_set_source (cr, _pattern);
cairo_matrix_init_translate (&matrix, w - ds, 0);
cairo_pattern_set_matrix (_pattern, &matrix);
} else {
CairoWidget::set_source_rgb_a (cr, get_style()->get_bg (get_state()), 1);
cairo_fill (cr);
CairoWidget::set_source_rgb_a (cr, get_style()->get_fg (get_state()), 1);
Gtkmm2ext::rounded_rectangle (cr, CORNER_OFFSET, CORNER_OFFSET,
ds - CORNER_SIZE, h - CORNER_SIZE, CORNER_RADIUS);
}
cairo_fill (cr);
}
/* draw the unity-position line if it's not at either end*/
if (_display_unity_line && _unity_loc > CORNER_RADIUS) {
context->set_line_width (1);
context->set_line_cap (Cairo::LINE_CAP_ROUND);
Gdk::Color c = get_style()->get_fg (Gtk::STATE_ACTIVE);
context->set_source_rgba (c.get_red_p() * 1.5, c.get_green_p() * 1.5, c.get_blue_p() * 1.5, 0.85);
if (_orien == VERT) {
if (_unity_loc < h - CORNER_RADIUS) {
context->move_to (1.5, _unity_loc + CORNER_OFFSET + .5);
context->line_to (_girth - 1.5, _unity_loc + CORNER_OFFSET + .5);
context->stroke ();
}
} else {
if (_unity_loc < w - CORNER_RADIUS) {
context->move_to (_unity_loc - CORNER_OFFSET + .5, 1.5);
context->line_to (_unity_loc - CORNER_OFFSET + .5, _girth - 1.5);
context->stroke ();
}
}
}
if (_layout && !_text.empty() && _orien == HORIZ) {
cairo_save (cr);
if (_centered_text) {
/* center text */
cairo_move_to (cr, (w - _text_width)/2.0, h/2.0 - _text_height/2.0);
} else if (ds > .5 * w) {
cairo_move_to (cr, CORNER_OFFSET + 3, h/2.0 - _text_height/2.0);
cairo_set_operator(cr, CAIRO_OPERATOR_XOR);
} else {
cairo_move_to (cr, w - _text_width - CORNER_OFFSET - 3, h/2.0 - _text_height/2.0);
}
CairoWidget::set_source_rgb_a (cr, get_style()->get_text (get_state()), 1);
pango_cairo_show_layout (cr, _layout->gobj());
cairo_restore (cr);
}
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 = (_min_girth ? _min_girth : -1);
req->height = (_min_span ? _min_span : -1);
} else {
req->height = (_min_girth ? _min_girth : -1);
req->width = (_min_span ? _min_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 ();
}
if (is_realized()) {
/* recreate patterns in case we've changed size */
create_patterns ();
}
update_unity_position ();
}
bool
PixFader::on_button_press_event (GdkEventButton* ev)
{
if (ev->type != GDK_BUTTON_PRESS) {
if (_dragging) {
remove_modal_grab();
_dragging = false;
gdk_pointer_ungrab (GDK_CURRENT_TIME);
StopGesture ();
}
return false;
}
if (ev->button != 1 && ev->button != 2) {
return false;
}
add_modal_grab ();
StartGesture ();
_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 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);
StopGesture ();
if (!_hovering) {
Keyboard::magic_widget_drop_focus();
queue_draw ();
}
if (ev_pos == _grab_start) {
/* no motion - just a click */
const double slider_pos = display_span();
ev_pos = rint(ev_pos);
if (ev->state & Keyboard::TertiaryModifier) {
adjustment.set_value (_default_value);
} else if (ev->state & Keyboard::GainFineScaleModifier) {
adjustment.set_value (adjustment.get_lower());
} else if (ev_pos == slider_pos) {
; // click on current position, no move.
} else if ((_orien == VERT && ev_pos < slider_pos) || (_orien == HORIZ && ev_pos > slider_pos)) {
/* 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;
StopGesture ();
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 */
int
PixFader::display_span ()
{
float fract = (adjustment.get_value () - adjustment.get_lower()) / ((adjustment.get_upper() - adjustment.get_lower()));
int ds;
if (_orien == VERT) {
ds = (int)rint (_span * (1.0 - fract));
} else {
ds = (int)rint (_span * fract);
}
return ds;
}
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::show_unity_line (bool yn )
{
if (yn == _display_unity_line) return;
_display_unity_line = yn;
queue_draw();
}
void
PixFader::set_text (const std::string& str, bool centered, bool expose)
{
if (_layout && _text == str) {
return;
}
if (!_layout && !str.empty()) {
_layout = Pango::Layout::create (get_pango_context());
}
_text = str;
_centered_text = centered;
if (_layout) {
_layout->set_text (str);
_layout->get_pixel_size (_text_width, _text_height);
// queue_resize ();
if (expose) queue_draw ();
}
}
void
PixFader::on_state_changed (Gtk::StateType old_state)
{
Widget::on_state_changed (old_state);
create_patterns ();
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
_text = "";
set_text (txt, _centered_text, false);
}
/* patterns are cached and re-created as needed
* during 'expose' in the GUI thread */
_pattern = 0;
queue_draw ();
}
Gdk::Color
PixFader::get_parent_bg ()
{
Widget* parent = get_parent ();
while (parent) {
if (parent->get_has_window()) {
break;
}
parent = parent->get_parent();
}
if (parent && parent->get_has_window()) {
if (_current_parent != parent) {
if (_parent_style_change) _parent_style_change.disconnect();
_current_parent = parent;
_parent_style_change = parent->signal_style_changed().connect (mem_fun (*this, &PixFader::on_style_changed));
}
return parent->get_style ()->get_bg (parent->get_state());
}
return get_style ()->get_bg (get_state());
}