timeline-zoom-scale.cpp

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/*
  TimelineZoomScale  -  widget to control timeline zoom scale
 
   Copyright (C)
     2011,            Michael R. Fisher <mfisher31@gmail.com>
 
 **Lumiera** 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. See the file COPYING for further details.
 
* *****************************************************************/
 
 
#include "stage/widget/timeline-zoom-scale.hpp"
 
 
namespace stage {
namespace widget {
  
  TimelineZoomScale::TimelineZoomScale()
    : HBox()
    , adjustment(Gtk::Adjustment::create(0.5, 0.0, 1.0, 0.000001))
    , slider()
    , zoomIn(Gtk::Stock::ZOOM_IN)
    , zoomOut(Gtk::Stock::ZOOM_OUT)             
    , button_step_size(0.03)
    {
      /* Setup the Slider Control */
      slider.set_adjustment (adjustment);
      slider.set_size_request (123,10);
      slider.set_digits (6);
      
      /* Inverted because smaller values "zoom in" */
      slider.set_inverted (true);
      
      slider.set_draw_value (false);
      
      /* Make our connections */
      zoomIn.signal_clicked().
          connect (sigc::mem_fun(this, &TimelineZoomScale::on_zoom_in_clicked));
      zoomOut.signal_clicked().
          connect (sigc::mem_fun(this, &TimelineZoomScale::on_zoom_out_clicked));
      adjustment->signal_value_changed().
          connect (sigc::mem_fun(this, &TimelineZoomScale::on_zoom));
      
      /* Add Our Widgets and show them */
      pack_start (zoomOut,Gtk::PACK_SHRINK);
      pack_start (slider, Gtk::PACK_SHRINK);
      pack_start (zoomIn, Gtk::PACK_SHRINK);
      
      show_all();
    }
  
  
  void
  TimelineZoomScale::wireTimelineState (/* TODO what to pass here? */)   
  {
//  stateChangeSignal.connect (
//      sigc::mem_fun(this, &TimelineZoomScale::on_timeline_state_changed));
  }
  
  
  void
  TimelineZoomScale::on_timeline_state_changed (/* TODO what to pass here? */)
  {
//  adjustment->set_value (/* TODO how to represent the statte? */);
  }
  
  
  void
  TimelineZoomScale::on_zoom_in_clicked()
  {
    double newValue = adjustment->get_value() - button_step_size;
    adjustment->set_value(newValue);
  }
  
  
  void
  TimelineZoomScale::on_zoom_out_clicked()
  {
    double newValue = adjustment->get_value() + button_step_size;
    adjustment->set_value(newValue);
  }
  
  
  void
  TimelineZoomScale::on_zoom()
  {
    zoomSignal.emit (adjustment->get_value());
  }
  
  
  sigc::signal<void, double>
  TimelineZoomScale::signal_zoom()
  {
    return zoomSignal;
  }
  
  
}}// namespace stage::widget