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livetrax/libs/gtkmm2ext/motionfeedback.cc

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/*
Copyright (C) 1998-99 Paul Barton-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: motionfeedback.cc,v 1.5 2004/03/01 03:44:19 pauld Exp $
*/
#include <iostream>
#include <cmath>
#include <unistd.h>
#include <stdio.h> /* for snprintf, grrr */
#include <gdk/gdkkeysyms.h>
#include <gtkmm.h>
#include "gtkmm2ext/motionfeedback.h"
#include "gtkmm2ext/keyboard.h"
using namespace Gtk;
using namespace Gtkmm2ext;
using namespace sigc;
MotionFeedback::MotionFeedback (Glib::RefPtr<Gdk::Pixbuf> pix,
Type t,
const char *widget_name,
Adjustment *adj,
bool with_numeric_display, int subw, int subh)
: type (t)
, value_packer (0)
, value (0)
, pixbuf (pix)
, subwidth (subw)
, subheight (subh)
{
char value_name[1024];
if (adj == NULL) {
i_own_my_adjustment = true;
set_adjustment (new Adjustment (0, 0, 10000, 1, 10, 0));
} else {
i_own_my_adjustment = false;
set_adjustment (adj);
}
default_value = adjustment->get_value();
HBox* hpacker = manage (new HBox);
hpacker->pack_start (pixwin, true, false);
hpacker->show ();
pack_start (*hpacker, false, false);
pixwin.show ();
if (with_numeric_display) {
value_packer = new HBox;
value = new SpinButton (*adjustment);
value_packer->pack_start (*value, false, false);
if (step_inc < 1) {
value->set_digits (abs ((int) ceil (log10 (step_inc))));
}
pack_start (*value_packer, false, false);
if (widget_name) {
snprintf (value_name, sizeof(value_name), "%sValue", widget_name);
value->set_name (value_name);
}
value->show ();
}
adjustment->signal_value_changed().connect (mem_fun (*this, &MotionFeedback::adjustment_changed));
pixwin.set_events (Gdk::BUTTON_PRESS_MASK|
Gdk::BUTTON_RELEASE_MASK|
Gdk::POINTER_MOTION_MASK|
Gdk::ENTER_NOTIFY_MASK|
Gdk::LEAVE_NOTIFY_MASK|
Gdk::SCROLL_MASK|
Gdk::KEY_PRESS_MASK|
Gdk::KEY_RELEASE_MASK);
pixwin.set_flags (CAN_FOCUS);
/* Proxy all important events on the pixwin to ourselves */
pixwin.signal_button_press_event().connect(mem_fun (*this,&MotionFeedback::pixwin_button_press_event));
pixwin.signal_button_release_event().connect(mem_fun (*this,&MotionFeedback::pixwin_button_release_event));
pixwin.signal_motion_notify_event().connect(mem_fun (*this,&MotionFeedback::pixwin_motion_notify_event));
pixwin.signal_enter_notify_event().connect(mem_fun (*this,&MotionFeedback::pixwin_enter_notify_event));
pixwin.signal_leave_notify_event().connect(mem_fun (*this,&MotionFeedback::pixwin_leave_notify_event));
pixwin.signal_key_press_event().connect(mem_fun (*this,&MotionFeedback::pixwin_key_press_event));
pixwin.signal_scroll_event().connect(mem_fun (*this,&MotionFeedback::pixwin_scroll_event));
pixwin.signal_expose_event().connect(mem_fun (*this,&MotionFeedback::pixwin_expose_event), true);
pixwin.signal_size_request().connect(mem_fun (*this,&MotionFeedback::pixwin_size_request));
}
MotionFeedback::~MotionFeedback()
{
if (i_own_my_adjustment) {
delete adjustment;
}
delete value;
delete value_packer;
}
void
MotionFeedback::set_adjustment (Adjustment *adj)
{
adjustment = adj;
if (value) {
value->set_adjustment (*adj);
}
_lower = adj->get_lower();
_upper = adj->get_upper();
_range = _upper - _lower;
step_inc = adj->get_step_increment();
page_inc = adj->get_page_increment();
}
bool
MotionFeedback::pixwin_button_press_event (GdkEventButton *ev)
{
switch (ev->button) {
case 2:
return FALSE; /* XXX why ? */
case 1:
grab_is_fine = false;
break;
case 3:
grab_is_fine = true;
break;
}
gtk_grab_add(GTK_WIDGET(pixwin.gobj()));
grabbed_y = ev->y_root;
grabbed_x = ev->x_root;
/* XXX should we return TRUE ? */
return FALSE;
}
bool
MotionFeedback::pixwin_button_release_event (GdkEventButton *ev)
{
switch (ev->button) {
case 1:
if (pixwin.has_grab()) {
if (!grab_is_fine) {
gtk_grab_remove
(GTK_WIDGET(pixwin.gobj()));
}
}
if (Keyboard::modifier_state_equals (ev->state, Keyboard::TertiaryModifier)) {
/* shift click back to the default */
adjustment->set_value (default_value);
return true;
}
break;
case 3:
if (pixwin.has_grab()) {
if (grab_is_fine) {
gtk_grab_remove
(GTK_WIDGET(pixwin.gobj()));
}
}
break;
}
return VBox::on_button_release_event (ev);
}
bool
MotionFeedback::pixwin_motion_notify_event (GdkEventMotion *ev)
{
gfloat multiplier;
gfloat x_delta;
gfloat y_delta;
if(!pixwin.has_grab()) {
return VBox::on_motion_notify_event (ev);
}
multiplier = ((ev->state & Keyboard::TertiaryModifier) ? 100 : 1) *
((ev->state & Keyboard::SecondaryModifier) ? 10 : 1) *
((ev->state & Keyboard::PrimaryModifier) ? 2 : 1);
y_delta = grabbed_y - ev->y_root;
grabbed_y = ev->y_root;
x_delta = ev->x_root - grabbed_x;
if (y_delta == 0) return TRUE;
y_delta *= 1 + (x_delta/100);
y_delta *= multiplier;
y_delta /= 10;
adjustment->set_value (adjustment->get_value() +
((grab_is_fine ? step_inc : page_inc) * y_delta));
return true;
}
bool
MotionFeedback::pixwin_enter_notify_event (GdkEventCrossing *ev)
{
pixwin.grab_focus();
return false;
}
bool
MotionFeedback::pixwin_leave_notify_event (GdkEventCrossing *ev)
{
pixwin.unset_flags (HAS_FOCUS);
return false;
}
bool
MotionFeedback::pixwin_key_press_event (GdkEventKey *ev)
{
bool retval = false;
gfloat curval;
gfloat multiplier;
multiplier = ((ev->state & Keyboard::TertiaryModifier) ? 100 : 1) *
((ev->state & Keyboard::SecondaryModifier) ? 10 : 1) *
((ev->state & Keyboard::PrimaryModifier) ? 2 : 1);
switch (ev->keyval) {
case GDK_Page_Up:
retval = true;
curval = adjustment->get_value();
adjustment->set_value (curval + (multiplier * page_inc));
break;
case GDK_Page_Down:
retval = true;
curval = adjustment->get_value();
adjustment->set_value (curval - (multiplier * page_inc));
break;
case GDK_Up:
retval = true;
curval = adjustment->get_value();
adjustment->set_value (curval + (multiplier * step_inc));
break;
case GDK_Down:
retval = true;
curval = adjustment->get_value();
adjustment->set_value (curval - (multiplier * step_inc));
break;
case GDK_Home:
retval = true;
adjustment->set_value (_lower);
break;
case GDK_End:
retval = true;
adjustment->set_value (_upper);
break;
}
return retval;
}
void
MotionFeedback::adjustment_changed ()
{
pixwin.queue_draw ();
}
bool
MotionFeedback::pixwin_expose_event (GdkEventExpose* ev)
{
GtkWidget* widget = GTK_WIDGET(pixwin.gobj());
GdkWindow *window = pixwin.get_window()->gobj();
GtkAdjustment* adj = adjustment->gobj();
int phase = (int)((adj->value - adj->lower) * 64 /
(adj->upper - adj->lower));
// skip middle phase except for true middle value
if (type == Rotary && phase == 32) {
double pt = (adj->value - adj->lower) * 2.0 /
(adj->upper - adj->lower) - 1.0;
if (pt < 0)
phase = 31;
if (pt > 0)
phase = 33;
}
// endless knob: skip 90deg highlights unless the value is really a multiple of 90deg
if (type == Endless && !(phase % 16)) {
if (phase == 64) {
phase = 0;
}
double nom = adj->lower + phase * (adj->upper - adj->lower) / 64.0;
double diff = (adj->value - nom) / (adj->upper - adj->lower);
if (diff > 0.0001)
phase = (phase + 1) % 64;
if (diff < -0.0001)
phase = (phase + 63) % 64;
}
gdk_draw_pixbuf (GDK_DRAWABLE(window), widget->style->fg_gc[0],
pixbuf->gobj(),
phase * subwidth, type * subheight,
0, 0, subwidth, subheight, GDK_RGB_DITHER_NORMAL, 0, 0);
return true;
}
bool
MotionFeedback::pixwin_scroll_event (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;
}
void
MotionFeedback::pixwin_size_request (GtkRequisition* req)
{
req->width = subwidth;
req->height = subheight;
}