/********************************************************************
**                Image Component Library (ICL)                    **
**                                                                 **
** Copyright (C) 2006-2012 CITEC, University of Bielefeld          **
**                         Neuroinformatics Group                  **
** Website: www.iclcv.org and                                      **
**          http://opensource.cit-ec.de/projects/icl               **
**                                                                 **
** File   : ICLQt/examples/gui-callback-test.cpp                   **
** Module : ICLQt                                                  **
** Authors: Christof Elbrechter                                    **
**                                                                 **
**                                                                 **
** Commercial License                                              **
** ICL can be used commercially, please refer to our website       **
** www.iclcv.org for more details.                                 **
**                                                                 **
** GNU General Public License Usage                                **
** Alternatively, this file may be used under the terms of the     **
** GNU General Public License version 3.0 as published by the      **
** Free Software Foundation and appearing in the file LICENSE.GPL  **
** included in the packaging of this file.  Please review the      **
** following information to ensure the GNU General Public License  **
** version 3.0 requirements will be met:                           **
** http://www.gnu.org/copyleft/gpl.html.                           **
**                                                                 **
** The development of this software was supported by the           **
** Excellence Cluster EXC 277 Cognitive Interaction Technology.    **
** The Excellence Cluster EXC 277 is a grant of the Deutsche       **
** Forschungsgemeinschaft (DFG) in the context of the German       **
** Excellence Initiative.                                          **
**                                                                 **
*********************************************************************/

#include <ICLQt/Common.h>

/// global gui instance
GUI gui;

// Our working thread, calling it's run function 
// asynchronously to the GUI Thread
void run(){
  // shortcut to extract currentTimeLabel from the gui
  gui["currentTimeLabel"] = Time::now().toString();
  Thread::sleep(1);
}

// a simple callback function of type "void (*callback)(void)"
void exit_callback(void){
  printf("exit callback was called \n");
  exit(0);
}

// another one (we can also access the GUI from here)
void click_callback(){
  gui["currentTimeLabel"] = str("hello!");
}

// a more complex callback implementing the GUI::Callback interface
// In contrast to simple functions, this callbacks are able to have 'own data'
struct MyCallback : public GUI::Callback{
  Time m_lastTime;
  void foo(){
    Time now = Time::now();
    Time dt = now-m_lastTime;

    // here we could use the macro gui_LabelHandle(timeDiffLabel) as well
    gui["timeDiffLabel"] = str(dt.toSecondsDouble())+" sec";
    m_lastTime = now;
  }
} myCallback;

void normal_slider_callback(){
  std::cout << "normal slider callback called (slider value is " << gui["slider"].as<int>() << ")" << std::endl;
}

template<int n>
void slider_cb(){
  static const std::string names[] = {"move","press","release","value","all"};
  std::cout << __FUNCTION__ << "(" << names[n] << "): " <<  gui["slider"].as<int>() << std::endl;
}

void slider_complex_cb(const std::string &handle){
  std::cout << __FUNCTION__ << " (handle-name:" << handle << ")" << std::endl;
}

void init(){
  // create some nice components
  gui << Label("something").handle("currentTimeLabel").label("current time")
      << Label("something").handle("timeDiffLabel").label("time since last call")
      << Slider(0,100,50).handle("slider").label("a slider")
      << Button("Click me!").handle("click")
      << Button("Click me too!").handle("click-2")
      << Button("Exit!").handle("exit")
      << Show();
  
  /// sometimes, this works as well !
  gui["currentTimeLabel"] = Time::now().toString();
  
  // register callbacks (on the specific handles)
  gui["exit"].registerCallback(function(exit_callback));
  gui["click"].registerCallback(function(click_callback));

  // or let gui find the corresponding components internally
  gui.registerCallback(function(myCallback,&MyCallback::foo),"click-2");

  // register a 'normal' value changed callback to the slider
  gui["slider"].registerCallback(normal_slider_callback);

  // .. or extract the slider-handle that provides an interface
  // for registering callbacks to specific slider events
  SliderHandle slider = gui["slider"];
  slider.registerCallback(slider_cb<0>,"move");
  slider.registerCallback(slider_cb<1>,"press");
  slider.registerCallback(slider_cb<2>,"release");
  slider.registerCallback(slider_cb<3>,"value");
  slider.registerCallback(slider_cb<4>,"all");

  slider.registerCallback(slider_complex_cb);
  
}

int main(int n, char **ppc){
  return ICLApplication(n,ppc,"",init,run).exec();
}