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livetrax/libs/gtkmm2ext/pixscroller.cc

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/*
Copyright (C) 2005 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 <iostream>
#include <algorithm>
#include <cmath>
#include <gtkmm.h>
#include "gtkmm2ext/pixscroller.h"
#include "gtkmm2ext/keyboard.h"
using namespace std;
using namespace Gtk;
using namespace Gtkmm2ext;
PixScroller::PixScroller (Adjustment& a,
Glib::RefPtr<Gdk::Pixbuf> s,
Glib::RefPtr<Gdk::Pixbuf> r)
: adj (a),
rail (r),
slider (s)
{
Cairo::Format format;
dragging = false;
add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK|Gdk::SCROLL_MASK);
adj.signal_value_changed().connect (mem_fun (*this, &PixScroller::adjustment_changed));
default_value = adj.get_value();
sliderrect.set_width(slider->get_width());
sliderrect.set_height(slider->get_height());
railrect.set_width(rail->get_width());
railrect.set_height(rail->get_height());
railrect.set_y(sliderrect.get_height() / 2);
sliderrect.set_x(0);
overall_height = railrect.get_height() + sliderrect.get_height();
sliderrect.set_y((int) rint ((overall_height - sliderrect.get_height()) * (adj.get_upper() - adj.get_value())));
railrect.set_x((sliderrect.get_width() / 2) - 2);
if (rail->get_has_alpha()) {
format = Cairo::FORMAT_ARGB32;
} else {
format = Cairo::FORMAT_RGB24;
}
rail_surface = Cairo::ImageSurface::create (format, rail->get_width(), rail->get_height());
rail_context = Cairo::Context::create (rail_surface);
Gdk::Cairo::set_source_pixbuf (rail_context, rail, 0.0, 0.0);
rail_context->paint();
if (slider->get_has_alpha()) {
format = Cairo::FORMAT_ARGB32;
} else {
format = Cairo::FORMAT_RGB24;
}
slider_surface = Cairo::ImageSurface::create (format, slider->get_width(), slider->get_height());
slider_context = Cairo::Context::create (slider_surface);
Gdk::Cairo::set_source_pixbuf (slider_context, slider, 0.0, 0.0);
slider_context->paint();
}
void
PixScroller::on_size_request (GtkRequisition* requisition)
{
requisition->width = sliderrect.get_width();
requisition->height = overall_height;
}
bool
PixScroller::on_expose_event (GdkEventExpose* ev)
{
GdkRectangle intersect;
Glib::RefPtr<Gdk::Window> win (get_window());
Cairo::RefPtr<Cairo::Context> context = get_window()->create_cairo_context();
if (gdk_rectangle_intersect (railrect.gobj(), &ev->area, &intersect)) {
context->save();
context->rectangle (intersect.x, intersect.y, intersect.width, intersect.height);
context->clip();
context->set_source (rail_surface, intersect.x - railrect.get_x(), intersect.y - railrect.get_y());
context->rectangle (intersect.x, intersect.y, intersect.width, intersect.height);
context->clip();
context->paint();
context->restore();
}
if (gdk_rectangle_intersect (sliderrect.gobj(), &ev->area, &intersect)) {
context->save();
context->rectangle (intersect.x, intersect.y, intersect.width, intersect.height);
context->clip();
context->set_source (rail_surface, intersect.x - sliderrect.get_x(), intersect.y - sliderrect.get_y());
context->rectangle (intersect.x, intersect.y, intersect.width, intersect.height);
context->clip();
context->paint();
context->restore();
}
return true;
}
bool
PixScroller::on_button_press_event (GdkEventButton* ev)
{
switch (ev->button) {
case 1:
if (!(ev->state & Keyboard::TertiaryModifier)) {
add_modal_grab();
grab_y = ev->y;
grab_start = ev->y;
grab_window = ev->window;
dragging = true;
}
break;
default:
break;
}
return false;
}
bool
PixScroller::on_button_release_event (GdkEventButton* ev)
{
double scale;
if (ev->state & Keyboard::PrimaryModifier) {
if (ev->state & Keyboard::SecondaryModifier) {
scale = 0.05;
} else {
scale = 0.1;
}
} else {
scale = 1.0;
}
switch (ev->button) {
case 1:
if (dragging) {
remove_modal_grab();
dragging = false;
if (ev->y == grab_start) {
/* no motion - just a click */
double fract;
if (ev->y < sliderrect.get_height()/2) {
/* near the top */
fract = 1.0;
} else {
fract = 1.0 - (ev->y - sliderrect.get_height()/2) / railrect.get_height();
}
fract = min (1.0, fract);
fract = max (0.0, fract);
adj.set_value (scale * fract * (adj.get_upper() - adj.get_lower()));
}
} else {
if (ev->state & Keyboard::TertiaryModifier) {
adj.set_value (default_value);
cerr << "default value = " << default_value << endl;
}
}
break;
default:
break;
}
return false;
}
bool
PixScroller::on_scroll_event (GdkEventScroll* ev)
{
double scale;
if (ev->state & Keyboard::PrimaryModifier) {
if (ev->state & Keyboard::SecondaryModifier) {
scale = 0.05;
} else {
scale = 0.1;
}
} else {
scale = 0.5;
}
switch (ev->direction) {
case GDK_SCROLL_UP:
/* wheel up */
adj.set_value (adj.get_value() + (adj.get_page_increment() * scale));
break;
case GDK_SCROLL_DOWN:
/* wheel down */
adj.set_value (adj.get_value() - (adj.get_page_increment() * scale));
break;
default:
break;
}
return false;
}
bool
PixScroller::on_motion_notify_event (GdkEventMotion* ev)
{
if (dragging) {
double fract;
double delta;
double scale;
if (ev->window != grab_window) {
grab_y = ev->y;
grab_window = ev->window;
return true;
}
if (ev->state & Keyboard::PrimaryModifier) {
if (ev->state & Keyboard::SecondaryModifier) {
scale = 0.05;
} else {
scale = 0.1;
}
} else {
scale = 1.0;
}
delta = ev->y - grab_y;
grab_y = ev->y;
fract = (delta / railrect.get_height());
fract = min (1.0, fract);
fract = max (-1.0, fract);
fract = -fract;
adj.set_value (adj.get_value() + scale * fract * (adj.get_upper() - adj.get_lower()));
}
return true;
}
void
PixScroller::adjustment_changed ()
{
int y = (int) rint ((overall_height - sliderrect.get_height()) * (adj.get_upper() - adj.get_value()));
if (y != sliderrect.get_y()) {
sliderrect.set_y(y);
queue_draw ();
}
}