/*
  timeline.cpp  -  Implementation of the timeline widget
 
  Copyright (C)         Lumiera.org
    2008,               Joel Holdsworth <joel@airwebreathe.org.uk>
 
  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.
 
* *****************************************************/

#include <cairomm-1.0/cairomm/cairomm.h>

#include "timeline-body.hpp"
#include "../timeline-widget.hpp"

using namespace Gtk;
using namespace std;
using namespace lumiera::gui::widgets::timeline;

namespace lumiera {
namespace gui {
namespace widgets {
namespace timeline {

TimelineBody::TimelineBody(lumiera::gui::widgets::TimelineWidget *timeline_widget) :
    Glib::ObjectBase("TimelineBody"),
    timelineWidget(timeline_widget)
  {
    g_assert(timelineWidget != NULL);
        
    // Connect up some events  
    timelineWidget->horizontalAdjustment.signal_value_changed().connect(
      sigc::mem_fun(this, &TimelineBody::on_scroll) );
    timelineWidget->verticalAdjustment.signal_value_changed().connect(
      sigc::mem_fun(this, &TimelineBody::on_scroll) );
    
    // Install style properties
    gtk_widget_class_install_style_property(
      GTK_WIDGET_CLASS(G_OBJECT_GET_CLASS(gobj())), 
      g_param_spec_boxed("track_background",
        "Track Background",
        "The background colour of timeline tracks",
        GDK_TYPE_COLOR, G_PARAM_READABLE));

  }

void
TimelineBody::on_scroll()
  {
    queue_draw();
  }

bool
TimelineBody::on_expose_event(GdkEventExpose* event)
  {
    // This is where we draw on the window
    Glib::RefPtr<Gdk::Window> window = get_window();
    if(!window)
      return false;
      
    read_styles();
      

    Gtk::Allocation allocation = get_allocation();
    const int width = allocation.get_width();
    const int height = allocation.get_height();

    Cairo::RefPtr<Cairo::Context> cairo = window->create_cairo_context();
    cairo->set_line_width(10.0);
    
    cairo->rectangle(50, 50, 100, 100);
    gdk_cairo_set_source_color(cairo->cobj(), &track_background);

    cairo->fill_preserve();


    cairo->translate(
      -timelineWidget->horizontalAdjustment.get_value(),
      -timelineWidget->verticalAdjustment.get_value());
    cairo->save();

    vector<timeline::Track*>::iterator i;
    for(i = timelineWidget->tracks.begin();
      i != timelineWidget->tracks.end(); i++)
    {
      timeline::Track *track = *i;
      g_assert(track != NULL);    
      track->draw_track(cairo);
    }

    cairo->restore();

    return true;

  }
  
void
TimelineBody::read_styles()
{
  GdkColor *colour;

  gtk_widget_style_get(Widget::gobj(), "track_background", &colour, NULL);

  // Did the color load successfully?
  if(colour != NULL)
    track_background = *colour;
  else
  {
    g_warning("track_background style value failed to load");
    track_background.red   = 0x0000;
    track_background.green = 0x0000;
    track_background.blue  = 0x0000;
    track_background.pixel = 0x00000000;
  }
}

}   // namespace timeline
}   // namespace widgets
}   // namespace gui
}   // namespace lumiera