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livetrax/libs/gtkmm2ext/barcontroller.cc
Paul Davis 4d210bf033 cairo-ify bar controller widget 
git-svn-id: svn://localhost/ardour2/branches/3.0@8789 d708f5d6-7413-0410-9779-e7cbd77b26cf
2011-02-08 23:43:18 +00:00

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/*
Copyright (C) 2004 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.
$Id$
*/
#include <string>
#include <sstream>
#include <climits>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <pbd/controllable.h>
#include <pbd/locale_guard.h>
#include "gtkmm2ext/gtk_ui.h"
#include "gtkmm2ext/utils.h"
#include "gtkmm2ext/keyboard.h"
#include "gtkmm2ext/barcontroller.h"
#include "i18n.h"
using namespace std;
using namespace Gtk;
using namespace Gtkmm2ext;
BarController::BarController (Gtk::Adjustment& adj,
boost::shared_ptr<PBD::Controllable> mc)
: adjustment (adj),
binding_proxy (mc),
spinner (adjustment)
{
_style = LeftToRight;
grabbed = false;
switching = false;
switch_on_release = false;
use_parent = false;
logarithmic = false;
layout = darea.create_pango_layout("");
set_shadow_type (SHADOW_NONE);
initial_value = adjustment.get_value ();
adjustment.signal_value_changed().connect (mem_fun (*this, &Gtk::Widget::queue_draw));
adjustment.signal_changed().connect (mem_fun (*this, &Gtk::Widget::queue_draw));
darea.add_events (Gdk::BUTTON_RELEASE_MASK|
Gdk::BUTTON_PRESS_MASK|
Gdk::POINTER_MOTION_MASK|
Gdk::ENTER_NOTIFY_MASK|
Gdk::LEAVE_NOTIFY_MASK|
Gdk::SCROLL_MASK);
darea.signal_expose_event().connect (mem_fun (*this, &BarController::expose));
darea.signal_motion_notify_event().connect (mem_fun (*this, &BarController::motion));
darea.signal_button_press_event().connect (mem_fun (*this, &BarController::button_press), false);
darea.signal_button_release_event().connect (mem_fun (*this, &BarController::button_release), false);
darea.signal_scroll_event().connect (mem_fun (*this, &BarController::scroll));
spinner.signal_activate().connect (mem_fun (*this, &BarController::entry_activated));
spinner.signal_focus_out_event().connect (mem_fun (*this, &BarController::entry_focus_out));
spinner.signal_input().connect (mem_fun (*this, &BarController::entry_input));
spinner.signal_output().connect (mem_fun (*this, &BarController::entry_output));
spinner.set_digits (3);
spinner.set_numeric (true);
add (darea);
show_all ();
}
void
BarController::drop_grab ()
{
if (grabbed) {
grabbed = false;
darea.remove_modal_grab();
StopGesture ();
}
}
bool
BarController::button_press (GdkEventButton* ev)
{
double fract;
if (binding_proxy.button_press_handler (ev)) {
return true;
}
switch (ev->button) {
case 1:
if (ev->type == GDK_2BUTTON_PRESS) {
switch_on_release = true;
drop_grab ();
} else {
switch_on_release = false;
darea.add_modal_grab();
grabbed = true;
grab_x = ev->x;
grab_window = ev->window;
StartGesture ();
}
return true;
break;
case 2:
fract = ev->x / (darea.get_width() - 2.0);
adjustment.set_value (adjustment.get_lower() + fract * (adjustment.get_upper() - adjustment.get_lower()));
case 3:
break;
case 4:
case 5:
break;
}
return false;
}
bool
BarController::button_release (GdkEventButton* ev)
{
drop_grab ();
switch (ev->button) {
case 1:
if (switch_on_release) {
Glib::signal_idle().connect (mem_fun (*this, &BarController::switch_to_spinner));
return true;
}
if ((ev->state & (Keyboard::TertiaryModifier|Keyboard::PrimaryModifier)) == Keyboard::TertiaryModifier) {
adjustment.set_value (initial_value);
} else {
double scale;
if ((ev->state & (Keyboard::PrimaryModifier|Keyboard::TertiaryModifier)) == (Keyboard::PrimaryModifier|Keyboard::TertiaryModifier)) {
scale = 0.01;
} else if (ev->state & Keyboard::PrimaryModifier) {
scale = 0.1;
} else {
scale = 1.0;
}
mouse_control (ev->x, ev->window, scale);
}
break;
case 2:
break;
case 3:
return false;
default:
break;
}
return true;
}
bool
BarController::scroll (GdkEventScroll* ev)
{
double scale;
if ((ev->state & (Keyboard::PrimaryModifier|Keyboard::TertiaryModifier)) == (Keyboard::PrimaryModifier|Keyboard::TertiaryModifier)) {
scale = 0.01;
} else if (ev->state & Keyboard::PrimaryModifier) {
scale = 0.1;
} else {
scale = 1.0;
}
switch (ev->direction) {
case GDK_SCROLL_UP:
case GDK_SCROLL_RIGHT:
adjustment.set_value (adjustment.get_value() + (scale * adjustment.get_step_increment()));
break;
case GDK_SCROLL_DOWN:
case GDK_SCROLL_LEFT:
adjustment.set_value (adjustment.get_value() - (scale * adjustment.get_step_increment()));
break;
}
return true;
}
bool
BarController::motion (GdkEventMotion* ev)
{
double scale;
if (!grabbed) {
return true;
}
if ((ev->state & (Keyboard::TertiaryModifier|Keyboard::PrimaryModifier)) == Keyboard::TertiaryModifier) {
return TRUE;
}
if ((ev->state & (Keyboard::PrimaryModifier|Keyboard::TertiaryModifier)) == (Keyboard::PrimaryModifier|Keyboard::TertiaryModifier)) {
scale = 0.01;
} else if (ev->state & Keyboard::PrimaryModifier) {
scale = 0.1;
} else {
scale = 1.0;
}
return mouse_control (ev->x, ev->window, scale);
}
gint
BarController::mouse_control (double x, GdkWindow* window, double scaling)
{
double fract = 0.0;
double delta;
if (window != grab_window) {
grab_x = x;
grab_window = window;
return TRUE;
}
delta = x - grab_x;
grab_x = x;
switch (_style) {
case Line:
case Blob:
case LeftToRight:
case CenterOut:
fract = scaling * (delta / (darea.get_width() - 2));
fract = min (1.0, fract);
fract = max (-1.0, fract);
adjustment.set_value (adjustment.get_value() + fract * (adjustment.get_upper() - adjustment.get_lower()));
break;
default:
fract = 0.0;
}
return TRUE;
}
bool
BarController::expose (GdkEventExpose* /*event*/)
{
Glib::RefPtr<Gdk::Window> win (darea.get_window());
Cairo::RefPtr<Cairo::Context> context = win->create_cairo_context();
Gdk::Color c;
Widget* parent;
gint x1=0, x2=0, y1=0, y2=0;
gint w, h;
double fract;
float r, g, b;
fract = ((adjustment.get_value() - adjustment.get_lower()) /
(adjustment.get_upper() - adjustment.get_lower()));
switch (_style) {
case Line:
w = darea.get_width() - 1;
h = darea.get_height();
x1 = (gint) floor (w * fract);
x2 = x1;
y1 = 0;
y2 = h - 1;
if (use_parent) {
parent = get_parent();
if (parent) {
c = parent->get_style()->get_fg (parent->get_state());
r = c.get_red_p ();
g = c.get_green_p ();
b = c.get_blue_p ();
context->set_source_rgb (r, g, b);
context->rectangle (0, 0, darea.get_width(), darea.get_height());
context->fill ();
}
} else {
c = get_style()->get_bg (get_state());
r = c.get_red_p ();
g = c.get_green_p ();
b = c.get_blue_p ();
context->set_source_rgb (r, g, b);
context->rectangle (0, 0, darea.get_width() - ((darea.get_width()+1) % 2), darea.get_height());
context->fill ();
}
c = get_style()->get_fg (get_state());
r = c.get_red_p ();
g = c.get_green_p ();
b = c.get_blue_p ();
context->set_source_rgb (r, g, b);
context->move_to (x1, 0);
context->line_to (x1, h);
context->stroke ();
break;
case Blob:
w = darea.get_width() - 1;
h = darea.get_height();
x1 = (gint) floor (w * fract);
x2 = min (w-2,h-2);
if (use_parent) {
parent = get_parent();
if (parent) {
c = parent->get_style()->get_fg (parent->get_state());
r = c.get_red_p ();
g = c.get_green_p ();
b = c.get_blue_p ();
context->set_source_rgb (r, g, b);
context->rectangle (0, 0, darea.get_width(), darea.get_height());
context->fill ();
}
} else {
c = get_style()->get_bg (get_state());
r = c.get_red_p ();
g = c.get_green_p ();
b = c.get_blue_p ();
context->set_source_rgb (r, g, b);
context->rectangle (0, 0, darea.get_width() - ((darea.get_width()+1) % 2), darea.get_height());
context->fill ();
}
c = get_style()->get_fg (get_state());
r = c.get_red_p ();
g = c.get_green_p ();
b = c.get_blue_p ();
context->arc (x1, ((h-2)/2)-1, x2, 0, 2*M_PI);
break;
case CenterOut:
w = darea.get_width();
h = darea.get_height()-2;
if (use_parent) {
parent = get_parent();
if (parent) {
c = parent->get_style()->get_fg (parent->get_state());
r = c.get_red_p ();
g = c.get_green_p ();
b = c.get_blue_p ();
context->set_source_rgb (r, g, b);
context->rectangle (0, 0, darea.get_width(), darea.get_height());
context->fill ();
}
} else {
c = get_style()->get_bg (get_state());
r = c.get_red_p ();
g = c.get_green_p ();
b = c.get_blue_p ();
context->set_source_rgb (r, g, b);
context->rectangle (0, 0, darea.get_width(), darea.get_height());
context->fill ();
}
c = get_style()->get_fg (get_state());
r = c.get_red_p ();
g = c.get_green_p ();
b = c.get_blue_p ();
x1 = (w/2) - ((w*fract)/2); // center, back up half the bar width
context->set_source_rgb (r, g, b);
context->rectangle (x1, 1, w*fract, h);
context->fill ();
break;
case LeftToRight:
w = darea.get_width() - 2;
h = darea.get_height() - 2;
x1 = 0;
x2 = (gint) floor (w * fract);
y1 = 0;
y2 = h;
/* bounding box */
c = get_style()->get_bg (get_state());
r = c.get_red_p ();
g = c.get_green_p ();
b = c.get_blue_p ();
context->set_source_rgb (r, g, b);
rounded_rectangle (context, 0, 0, darea.get_width(), darea.get_height());
context->stroke ();
/* draw active box */
c = get_style()->get_fg (get_state());
r = c.get_red_p ();
g = c.get_green_p ();
b = c.get_blue_p ();
context->set_source_rgb (r, g, b);
rounded_rectangle (context, 1 + x1, 1 + y1, x2, y2);
context->fill ();
/* draw inactive box */
c = get_style()->get_fg (STATE_INSENSITIVE);
r = c.get_red_p ();
g = c.get_green_p ();
b = c.get_blue_p ();
context->set_source_rgb (r, g, b);
rounded_rectangle (context, 1 + x2, 1 + y1, w - x2, y2);
context->fill ();
break;
case RightToLeft:
break;
case TopToBottom:
break;
case BottomToTop:
break;
}
/* draw label */
double xpos = -1;
std::string const label = get_label (xpos);
if (!label.empty()) {
layout->set_text (label);
int width, height, x;
layout->get_pixel_size (width, height);
if (xpos == -1) {
x = max (3, 1 + (x2 - (width/2)));
x = min (darea.get_width() - width - 3, (int) lrint (xpos));
} else {
x = lrint (darea.get_width() * xpos);
}
c = get_style()->get_text (get_state());
r = c.get_red_p ();
g = c.get_green_p ();
b = c.get_blue_p ();
context->set_source_rgb (r, g, b);
context->move_to (x, (darea.get_height()/2) - (height/2));
layout->show_in_cairo_context (context);
}
return true;
}
void
BarController::set_style (barStyle s)
{
_style = s;
darea.queue_draw ();
}
gint
BarController::switch_to_bar ()
{
if (switching) {
return FALSE;
}
switching = true;
if (get_child() == &darea) {
return FALSE;
}
remove ();
add (darea);
darea.show ();
switching = false;
SpinnerActive (false); /* EMIT SIGNAL */
return FALSE;
}
gint
BarController::switch_to_spinner ()
{
if (switching) {
return FALSE;
}
switching = true;
if (get_child() == &spinner) {
return FALSE;
}
remove ();
add (spinner);
spinner.show ();
spinner.select_region (0, spinner.get_text_length());
spinner.grab_focus ();
switching = false;
SpinnerActive (true); /* EMIT SIGNAL */
return FALSE;
}
void
BarController::entry_activated ()
{
switch_to_bar ();
}
bool
BarController::entry_focus_out (GdkEventFocus* /*ev*/)
{
entry_activated ();
return true;
}
void
BarController::set_use_parent (bool yn)
{
use_parent = yn;
queue_draw ();
}
void
BarController::set_sensitive (bool yn)
{
Frame::set_sensitive (yn);
darea.set_sensitive (yn);
}
/*
This is called when we need to update the adjustment with the value
from the spinner's text entry.
We need to use Gtk::Entry::get_text to avoid recursive nastiness :)
If we're not in logarithmic mode we can return false to use the
default conversion.
In theory we should check for conversion errors but set numeric
mode to true on the spinner prevents invalid input.
*/
int
BarController::entry_input (double* new_value)
{
if (!logarithmic) {
return false;
}
// extract a double from the string and take its log
Entry *entry = dynamic_cast<Entry *>(&spinner);
double value;
{
// Switch to user's preferred locale so that
// if they use different LC_NUMERIC conventions,
// we will honor them.
PBD::LocaleGuard lg ("");
sscanf (entry->get_text().c_str(), "%lf", &value);
}
*new_value = log(value);
return true;
}
/*
This is called when we need to update the spinner's text entry
with the value of the adjustment.
We need to use Gtk::Entry::set_text to avoid recursive nastiness :)
If we're not in logarithmic mode we can return false to use the
default conversion.
*/
bool
BarController::entry_output ()
{
if (!logarithmic) {
return false;
}
// generate the exponential and turn it into a string
// convert to correct locale.
stringstream stream;
string str;
char buf[128];
{
// Switch to user's preferred locale so that
// if they use different LC_NUMERIC conventions,
// we will honor them.
PBD::LocaleGuard lg ("");
snprintf (buf, sizeof (buf), "%g", exp (spinner.get_adjustment()->get_value()));
}
Entry *entry = dynamic_cast<Entry *>(&spinner);
entry->set_text(buf);
return true;
}
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