start_screen_widget.cpp

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/* Author: Dave Coleman */

// Qt
#include <QLabel>
#include <QTimer>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QMessageBox>
#include <QString>
#include <QApplication>
#include <QFont>
#include <QFileDialog>
// ROS
#include <ros/ros.h>
#include <ros/package.h> // for getting file path for loadng images
// SA
#include "header_widget.h" // title and instructions
#include "start_screen_widget.h"
// C
#include <fstream>  // for reading in urdf
#include <streambuf>
// Boost
#include <boost/algorithm/string.hpp> // for trimming whitespace from user input
#include <boost/filesystem.hpp>  // for reading folders/files
#include <boost/algorithm/string.hpp> // for string find and replace in paths

namespace moveit_setup_assistant
{

// Boost file system
namespace fs = boost::filesystem;

// ******************************************************************************************
// Start screen user interface for MoveIt Configuration Assistant
// ******************************************************************************************
StartScreenWidget::StartScreenWidget( QWidget* parent, moveit_setup_assistant::MoveItConfigDataPtr config_data )
  :  SetupScreenWidget( parent ), config_data_( config_data )
{


  // Basic widget container
  QVBoxLayout *layout = new QVBoxLayout( this );

  // Horizontal layout splitter
  QHBoxLayout *hlayout = new QHBoxLayout( );
  // Left side of screen
  QVBoxLayout *left_layout = new QVBoxLayout( );
  // Right side of screen
  QVBoxLayout *right_layout = new QVBoxLayout( );


  // Right Image Area ----------------------------------------------
  right_image_ = new QImage();
  right_image_label_ = new QLabel( this );
  std::string image_path = "./resources/MoveIt_Setup_Asst_xSm.png";
  if(chdir(config_data_->setup_assistant_path_.c_str()) != 0)
  {
    ROS_ERROR("FAILED TO CHANGE PACKAGE TO moveit_setup_assistant");
  }

  if (right_image_->load( image_path.c_str() ))
  {
    right_image_label_->setPixmap(QPixmap::fromImage( *right_image_));
    right_image_label_->setMinimumHeight(384);  // size of right_image_label_
    //right_image_label_->setMinimumWidth(450);
  }
  else
  {
    ROS_ERROR_STREAM("FAILED TO LOAD " << image_path );
  }

  logo_image_ = new QImage();
  logo_image_label_ = new QLabel( this );
  image_path = "./resources/moveit_logo.png";

  if (logo_image_->load( image_path.c_str() ))
  {
    logo_image_label_->setPixmap(QPixmap::fromImage( *logo_image_));
    logo_image_label_->setMinimumWidth(96);
  }
  else
  {
    ROS_ERROR_STREAM("FAILED TO LOAD " << image_path );
  }


  // Top Label Area ---------------------------------------------------
  HeaderWidget *header = new HeaderWidget( "MoveIt Setup Assistant",
                                           "Welcome to the MoveIt Setup Assistant! These tools will assist you in creating a MoveIt configuration package that is required to run MoveIt. This includes generating a Semantic Robot Description Format (SRDF) file, kinematics configuration file and OMPL planning configuration file. It also involves creating launch files for move groups, OMPL planner, planning contexts and the planning warehouse.",
                                           this);
  layout->addWidget( header );

  left_layout->addWidget(logo_image_label_);
  left_layout->setAlignment(logo_image_label_, Qt::AlignLeft | Qt::AlignTop);

  // Select Mode Area -------------------------------------------------
  select_mode_ = new SelectModeWidget( this );
  connect( select_mode_->btn_new_, SIGNAL( clicked() ), this, SLOT( showNewOptions() ) );
  connect( select_mode_->btn_exist_, SIGNAL( clicked() ), this, SLOT( showExistingOptions() ) );
  left_layout->addWidget( select_mode_ );

  // Path Box Area ----------------------------------------------------

  // Stack Path Dialog
  stack_path_ = new LoadPathWidget("Load MoveIt Configuration Package Path",
                                   "Specify the package name or path of an existing MoveIt configuration package to be edited for your robot. Example package name: <i>pr2_moveit_config</i>",
                                   true, this); // is directory
  stack_path_->hide(); // user needs to select option before this is shown
  left_layout->addWidget( stack_path_ );

  // URDF File Dialog
  urdf_file_ = new LoadPathWidget("Load a URDF or COLLADA Robot Model",
                                  "Specify the location of an existing Universal Robot Description Format or COLLADA file for your robot. The robot model will be loaded to the parameter server for you.",
                                  false, true, this); // no directory, load only
  urdf_file_->hide(); // user needs to select option before this is shown
  left_layout->addWidget( urdf_file_ );

  // Load settings box ---------------------------------------------
  QHBoxLayout *load_files_layout = new QHBoxLayout();

  progress_bar_ = new QProgressBar( this );
  progress_bar_->setMaximum(100);
  progress_bar_->setMinimum(0);
  progress_bar_->hide();
  load_files_layout->addWidget( progress_bar_ );
  //load_files_layout->setContentsMargins( 20, 30, 20, 30 );

  btn_load_ = new QPushButton("&Load Files", this);
  btn_load_->setMinimumWidth(180);
  btn_load_->setMinimumHeight(40);
  btn_load_->hide();
  load_files_layout->addWidget( btn_load_ );
  load_files_layout->setAlignment( btn_load_, Qt::AlignRight );
  connect( btn_load_, SIGNAL( clicked() ), this, SLOT( loadFilesClick() ) );

  // Next step instructions
  next_label_ = new QLabel( this );
  QFont next_label_font( "Arial", 11, QFont::Bold );
  next_label_->setFont( next_label_font );
  //next_label_->setWordWrap(true);
  next_label_->setText( "Success! Use the left navigation pane to continue." );
  //  next_label_->setSizePolicy( QSizePolicy::Expanding, QSizePolicy::Preferred );
  next_label_->hide(); // only show once the files have been loaded.

  right_layout->addWidget(right_image_label_);
  right_layout->setAlignment(right_image_label_, Qt::AlignRight | Qt::AlignTop);

  // Final Layout Setup ---------------------------------------------
  // Alignment
  layout->setAlignment( Qt::AlignTop );
  hlayout->setAlignment( Qt::AlignTop );
  left_layout->setAlignment( Qt::AlignTop );
  right_layout->setAlignment( Qt::AlignTop );

  // Stretch
  left_layout->setSpacing( 30 );
  //hlayout->setContentsMargins( 0, 20, 0, 0);

  // Attach Layouts
  hlayout->addLayout( left_layout );
  hlayout->addLayout( right_layout );
  layout->addLayout( hlayout );

  // Verticle Spacer
  QWidget *vspacer = new QWidget( this );
  vspacer->setSizePolicy( QSizePolicy::Preferred, QSizePolicy::Expanding );
  layout->addWidget( vspacer );

  // Attach bottom layout
  layout->addWidget( next_label_);
  layout->setAlignment( next_label_, Qt::AlignRight );
  layout->addLayout( load_files_layout );

  this->setLayout(layout);
  //  this->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);


  // Debug mode: auto load the configuration file by clicking button after a timeout
  if( config_data_->debug_ )
  {
    //select_mode_->btn_exist_->click();

    QTimer *update_timer = new QTimer( this );
    update_timer->setSingleShot( true ); // only run once
    connect( update_timer, SIGNAL( timeout() ), btn_load_, SLOT( click() ));
    update_timer->start( 100 );
  }


}

// ******************************************************************************************
// Destructor
// ******************************************************************************************
StartScreenWidget::~StartScreenWidget()
{
  delete right_image_; // does not have a parent passed to it
  delete logo_image_;
}

// ******************************************************************************************
// Show options for creating a new configuration package
// ******************************************************************************************
void StartScreenWidget::showNewOptions()
{
  // Do GUI stuff
  select_mode_->btn_exist_->setFlat( false );
  select_mode_->btn_new_->setFlat( true );
  urdf_file_->show();
  //  srdf_file_->show();
  stack_path_->hide();
  btn_load_->show();

  // Remember choice
  create_new_package_ = true;
}

// ******************************************************************************************
// Show options for editing an existing configuration package
// ******************************************************************************************
void StartScreenWidget::showExistingOptions()
{
  // Do GUI stuff
  select_mode_->btn_exist_->setFlat( true );
  select_mode_->btn_new_->setFlat( false );
  urdf_file_->hide();
  //srdf_file_->hide();
  stack_path_->show();
  btn_load_->show();

  // Remember choice
  create_new_package_ = false;
}

// ******************************************************************************************
// Load files to parameter server - CLICK
// ******************************************************************************************
void StartScreenWidget::loadFilesClick()
{
  // Disable start screen GUI components from being changed
  urdf_file_->setDisabled(true);
  //srdf_file_->setDisabled(true);
  stack_path_->setDisabled(true);
  select_mode_->setDisabled(true);
  btn_load_->setDisabled(true);
  progress_bar_->show();

  bool result;

  // Decide if this is a new config package, or loading an old one
  if( create_new_package_ )
  {
    result = loadNewFiles();
  }
  else
  {
    result = loadExistingFiles();
  }

  // Check if there was a failure loading files
  if( !result )
  {
    // Renable components
    urdf_file_->setDisabled(false);
    //srdf_file_->setDisabled(false);
    stack_path_->setDisabled(false);
    select_mode_->setDisabled(false);
    btn_load_->setDisabled(false);
    progress_bar_->hide();
  }
  else
  {
    // Hide the logo image so that other screens can resize the rviz thing properly
    right_image_label_->hide();
  }

}

// ******************************************************************************************
// Load exisiting package files
// ******************************************************************************************
bool StartScreenWidget::loadExistingFiles()
{
  // Progress Indicator
  progress_bar_->setValue( 10 );
  QApplication::processEvents();

  // Get the package path
  if( !createFullPackagePath() )
    return false; // error occured

  // Path of .setup_assistant file
  fs::path setup_assistant_file = config_data_->config_pkg_path_;
  setup_assistant_file /= ".setup_assistant";

  // Check if the old package is a setup assistant package. If it is not, quit
  if( ! fs::is_regular_file( setup_assistant_file ) )
  {
    QMessageBox::warning( this, "Incorrect Directory/Package",
                          QString("The chosen package location exists but was not previously created using this MoveIt Setup Assistant. If this is a mistake, replace the missing file: ")
                          .append( setup_assistant_file.make_preferred().native().c_str() ) );
    return false;
  }

  // Get setup assistant data
  if( !config_data_->inputSetupAssistantYAML( setup_assistant_file.make_preferred().native().c_str() ) )
  {
    QMessageBox::warning( this, "Setup Assistant File Error",
                          QString("Unable to correctly parse the setup assistant configuration file: " )
                          .append( setup_assistant_file.make_preferred().native().c_str() ) );
    return false;
  }

  // Progress Indicator
  progress_bar_->setValue( 30 );
  QApplication::processEvents();

  // Get the URDF path using the loaded .setup_assistant data and check it
  if( !createFullURDFPath() )
    return false; // error occured

  // Load the URDF
  if( !loadURDFFile( config_data_->urdf_path_ ) )
    return false; // error occured

  // Get the SRDF path using the loaded .setup_assistant data and check it
  if( !createFullSRDFPath( config_data_->config_pkg_path_ ) )
    return false; // error occured

  // Progress Indicator
  progress_bar_->setValue( 50 );
  QApplication::processEvents();

  // Load the SRDF
  if( !loadSRDFFile( config_data_->srdf_path_ ) )
    return false; // error occured

  // Progress Indicator
  progress_bar_->setValue( 60 );
  QApplication::processEvents();

  // Load the allowed collision matrix
  config_data_->loadAllowedCollisionMatrix();

  // Load kinematics yaml file if available --------------------------------------------------
  fs::path kinematics_yaml_path = config_data_->config_pkg_path_;
  kinematics_yaml_path /= "config/kinematics.yaml";

  if( !config_data_->inputKinematicsYAML( kinematics_yaml_path.make_preferred().native().c_str() ) )
  {
    QMessageBox::warning( this, "No Kinematic YAML File",
                          QString("Failed to parse kinematics yaml file. This file is not critical but any previous kinematic solver settings have been lost. To re-populate this file edit each existing planning group and choose a solver, then save each change. \n\nFile error at location ").append( kinematics_yaml_path.make_preferred().native().c_str() ) );
  }

  // DONE LOADING --------------------------------------------------------------------------

  // Call a function that enables navigation
  Q_EMIT readyToProgress();

  // Progress Indicator
  progress_bar_->setValue( 70 );
  QApplication::processEvents();

  // Load Rviz
  Q_EMIT loadRviz();

  // Progress Indicator
  progress_bar_->setValue( 100 );
  QApplication::processEvents();

  next_label_->show(); // only show once the files have been loaded

  ROS_INFO( "Loading Setup Assistant Complete" );
  return true; // success!
}

// ******************************************************************************************
// Load chosen files for creating new package
// ******************************************************************************************
bool StartScreenWidget::loadNewFiles()
{
  // Get URDF file path
  config_data_->urdf_path_ = urdf_file_->getPath();

  // Check that box is filled out
  if( config_data_->urdf_path_.empty() )
  {
    QMessageBox::warning( this, "Error Loading Files", "No robot model file specefied" );
    return false;
  }

  // Check that this file exits
  if( ! fs::is_regular_file( config_data_->urdf_path_ ) )
  {
    QMessageBox::warning( this, "Error Loading Files",
                          QString("Unable to locate the URDF file: " )
                          .append( config_data_->urdf_path_.c_str() ) );
    return false;
  }

  // Attempt to get the ROS package from the path
  if( !extractPackageNameFromPath() )
  {
    return false; // An error occurred
  }

  // Progress Indicator
  progress_bar_->setValue( 20 );
  QApplication::processEvents();

  // Load the URDF to the parameter server and check that it is correct format
  if( !loadURDFFile( config_data_->urdf_path_ ) )
    return false; // error occurred

  // Progress Indicator
  progress_bar_->setValue( 50 );
  QApplication::processEvents();

  // Create blank SRDF file
  const std::string blank_srdf =
    "<?xml version='1.0'?><robot name='" + config_data_->urdf_model_->getName() + "'></robot>";

  // Load a blank SRDF file to the parameter server
  if( !setSRDFFile( blank_srdf ))
  {
    QMessageBox::warning( this, "Error Loading Files", "Failure loading blank SRDF file." );
    return false;
  }

  // Progress Indicator
  progress_bar_->setValue( 60 );
  QApplication::processEvents();

  // DONE LOADING --------------------------------------------------------------------------

  // Call a function that enables navigation
  Q_EMIT readyToProgress();

  // Progress Indicator
  progress_bar_->setValue( 70 );
  QApplication::processEvents();

  // Load Rviz
  Q_EMIT loadRviz();

  // Progress Indicator
  progress_bar_->setValue( 100 );
  QApplication::processEvents();

  next_label_->show(); // only show once the files have been loaded

  ROS_INFO( "Loading Setup Assistant Complete" );
  return true; // success!
}

// ******************************************************************************************
// Load URDF File to Parameter Server
// ******************************************************************************************
bool StartScreenWidget::loadURDFFile( const std::string& urdf_file_path )
{
  // check that URDF can be loaded
  std::ifstream urdf_stream( urdf_file_path.c_str() );
  if( !urdf_stream.good() ) // File not found
  {
    QMessageBox::warning( this, "Error Loading Files", QString( "URDF/COLLADA file not found: " ).append( urdf_file_path.c_str() ) );
    return false;
  }
  std::string urdf_string;
  bool xacro = false;

  if (urdf_file_path.find(".xacro") != std::string::npos)
  {
    std::string cmd("rosrun xacro xacro.py ");
    cmd += urdf_file_path;
    ROS_INFO( "Running '%s'...", cmd.c_str() );

    FILE* pipe = popen(cmd.c_str(), "r");
    if (!pipe)
    {
      QMessageBox::warning( this, "Error Loading Files", QString( "XACRO file or parser not found: " ).append( urdf_file_path.c_str() ) );
      return false;
    }
    char buffer[128] = {0};
    while (!feof(pipe))
    {
      if (fgets(buffer, sizeof(buffer), pipe) != NULL)
        urdf_string += buffer;
    }
    pclose(pipe);
    
    if (urdf_string.empty())
    {
      QMessageBox::warning( this, "Error Loading Files", QString( "Unable to parse XACRO file: " ).append( urdf_file_path.c_str() ) );
      return false;
    }
    xacro = true;
  }
  else
  {
    // Load the file to a string using an efficient memory allocation technique
    urdf_stream.seekg(0, std::ios::end);
    urdf_string.reserve(urdf_stream.tellg());
    urdf_stream.seekg(0, std::ios::beg);
    urdf_string.assign( (std::istreambuf_iterator<char>(urdf_stream)), std::istreambuf_iterator<char>() );
    urdf_stream.close();
  }
  // Verify that file is in correct format / not an XACRO by loading into robot model
  if( !config_data_->urdf_model_->initString( urdf_string ) )
  {
    QMessageBox::warning( this, "Error Loading Files",
                          "URDF/COLLADA file is not a valid robot model." );
    return false;
  }
  config_data_->urdf_from_xacro_ = xacro;

  ROS_INFO_STREAM( "Loaded " << config_data_->urdf_model_->getName() << " robot model." );

  // Load the robot model to the parameter server
  ros::NodeHandle nh;
  int steps = 0;
  while (!nh.ok() && steps < 4)
  {
    ROS_WARN("Waiting for node handle");
    sleep(1);
    steps++;
    ros::spinOnce();
  }

  ROS_INFO("Setting Param Server with Robot Description");
  //ROS_WARN("Ignore the following error message 'Failed to contact master'. This is a known issue.");
  nh.setParam("/robot_description", urdf_string);

  return true;
}

// ******************************************************************************************
// Load SRDF File to Parameter Server
// ******************************************************************************************
bool StartScreenWidget::loadSRDFFile( const std::string& srdf_file_path )
{
  // check that SRDF can be loaded
  std::ifstream srdf_stream( srdf_file_path.c_str() );
  if( !srdf_stream.good() ) // File not found
  {
    QMessageBox::warning( this, "Error Loading Files", QString( "SRDF file not found: " ).append( config_data_->srdf_path_.c_str() ) );
    return false;
  }

  // Load the file to a string using an efficient memory allocation technique
  std::string srdf_string;
  srdf_stream.seekg(0, std::ios::end);
  srdf_string.reserve(srdf_stream.tellg());
  srdf_stream.seekg(0, std::ios::beg);
  srdf_string.assign( (std::istreambuf_iterator<char>(srdf_stream)), std::istreambuf_iterator<char>() );
  srdf_stream.close();

  // Put on param server
  return setSRDFFile( srdf_string );
}

// ******************************************************************************************
// Put SRDF File on Parameter Server
// ******************************************************************************************
bool StartScreenWidget::setSRDFFile( const std::string& srdf_string )
{
  // Verify that file is in correct format / not an XACRO by loading into robot model
  if( !config_data_->srdf_->initString( *config_data_->urdf_model_, srdf_string ) )
  {
    QMessageBox::warning( this, "Error Loading Files",
                          "SRDF file not a valid semantic robot description model." );
    return false;
  }
  ROS_INFO_STREAM( "Robot semantic model successfully loaded." );

  // Load to param server
  ros::NodeHandle nh;
  int steps = 0;
  while (!nh.ok() && steps < 4)
  {
    ROS_WARN("Waiting for node handle");
    sleep(1);
    steps++;
    ros::spinOnce();
  }

  ROS_INFO("Setting Param Server with Robot Semantic Description");
  nh.setParam("/robot_description_semantic", srdf_string);

  return true;
}

// ******************************************************************************************
// Extract the package/stack name and relative path to urdf from an absolute path name
// Input:  cofig_data_->urdf_path_
// Output: cofig_data_->urdf_pkg_name_
//         cofig_data_->urdf_pkg_relative_path_
// ******************************************************************************************
bool StartScreenWidget::extractPackageNameFromPath()
{
  // Get the path to urdf, save filename
  fs::path urdf_path = config_data_->urdf_path_;
  fs::path urdf_directory = urdf_path;
  urdf_directory.remove_filename();

  fs::path sub_path; // holds the directory less one folder
  fs::path relative_path; // holds the path after the sub_path
  std::string package_name; // result

  // Paths for testing if files exist
  fs::path package_path;

  std::vector<std::string> path_parts; // holds each folder name in vector

  // Copy path into vector of parts
  for (fs::path::iterator it = urdf_directory.begin(); it != urdf_directory.end(); ++it)
    path_parts.push_back( it->native() );
  
  bool packageFound = false;

  // reduce the generated directoy path's folder count by 1 each loop
  for( int segment_length = path_parts.size(); segment_length > 0; --segment_length )
  {
    // Reset the sub_path
    sub_path.clear();

    // Create a subpath based on the outer loops length
    for( int segment_count = 0; segment_count < segment_length; ++segment_count )
    {
      sub_path /= path_parts[ segment_count ];

      // decide if we should remember this directory name because it is topmost, in case it is the package/stack name
      if( segment_count == segment_length - 1)
      {
        package_name = path_parts[ segment_count ];
      }
    }

    // check if this directory has a package.xml
    package_path = sub_path;
    package_path /= "package.xml";
    ROS_DEBUG_STREAM("Checking for " << package_path.make_preferred().native());

    // Check if the files exist
    if( fs::is_regular_file( package_path ) || fs::is_regular_file( sub_path / "manifest.xml" ))
    {
      // now generate the relative path
      for( size_t relative_count = segment_length; relative_count < path_parts.size(); ++relative_count )
        relative_path /= path_parts[ relative_count ];

      // add the URDF filename at end of relative path
      relative_path /= urdf_path.filename();

      // end the search
      segment_length = 0;
      packageFound = true;
      break;
    }

  }

  // Assign data to moveit_config_data
  if( !packageFound )
  {
    // No package name found, we must be outside ROS
    config_data_->urdf_pkg_name_ = "";
    config_data_->urdf_pkg_relative_path_ = config_data_->urdf_path_; // just the absolute path
  }
  else
  {
    // Check that ROS can find the package
    const std::string robot_desc_pkg_path = ros::package::getPath( config_data_->urdf_pkg_name_ ) + "/";

    if( robot_desc_pkg_path.empty() )
    {
      QMessageBox::warning( this, "Package Not Found In ROS Workspace", QString("ROS was unable to find the package name '")
                            .append( config_data_->urdf_pkg_name_.c_str() )
                            .append("' within the ROS workspace. This may cause issues later.") );
    }

    // Success
    config_data_->urdf_pkg_name_ = package_name;
    config_data_->urdf_pkg_relative_path_ = relative_path.make_preferred().native();
  }

  ROS_DEBUG_STREAM( "URDF Package Name: " << config_data_->urdf_pkg_name_ );
  ROS_DEBUG_STREAM( "URDF Package Path: " << config_data_->urdf_pkg_relative_path_ );

  return true; // success
}

// ******************************************************************************************
// Make the full URDF path using the loaded .setup_assistant data
// ******************************************************************************************
bool StartScreenWidget::createFullURDFPath()
{
  fs::path urdf_path;

  // Check if a package name was provided
  if( config_data_->urdf_pkg_name_.empty() || config_data_->urdf_pkg_name_ == "\"\"" )
  {
    urdf_path = config_data_->urdf_pkg_relative_path_;
    ROS_WARN("The URDF path is absolute to the filesystem and not relative to a ROS package/stack");
  }
  else
  {

    // Check that ROS can find the package
    fs::path robot_desc_pkg_path = ros::package::getPath( config_data_->urdf_pkg_name_ );

    if( robot_desc_pkg_path.empty() )
    {
      QMessageBox::warning( this, "Error Loading Files", QString("ROS was unable to find the package name '")
                            .append( config_data_->urdf_pkg_name_.c_str() )
                            .append("'. Verify this package is inside your ROS workspace and is a proper ROS package.") );
      return false;
    }

    // Append the relative URDF url path
    urdf_path = robot_desc_pkg_path;
    urdf_path /= config_data_->urdf_pkg_relative_path_;
  }


  // Check that this file exits -------------------------------------------------
  if( ! fs::is_regular_file( urdf_path ) )
  {
    QMessageBox::warning( this, "Error Loading Files",
                          QString( "Unable to locate the URDF file in package. File: " )
                          .append( urdf_path.make_preferred().native().c_str() ) );
    return false;
  }

  // Remember the path
  config_data_->urdf_path_ = urdf_path.make_preferred().native();

  return true; // success
}

// ******************************************************************************************
// Make the full SRDF path using the loaded .setup_assistant data
// ******************************************************************************************
bool StartScreenWidget::createFullSRDFPath( const std::string& package_path )
{
  // Append the relative SRDF url path
  fs::path srdf_path = package_path;
  srdf_path /= config_data_->srdf_pkg_relative_path_;
  config_data_->srdf_path_ = srdf_path.make_preferred().native();

  // Check that this file exits
  if( ! fs::is_regular_file( config_data_->srdf_path_ ) )
  {
    QMessageBox::warning( this, "Error Loading Files",
                          QString("Unable to locate the SRDF file: " )
                          .append( config_data_->srdf_path_.c_str() ) );
    return false;
  }

  return true; // success
}

// ******************************************************************************************
// Get the full package path for editing an existing package
// ******************************************************************************************
bool StartScreenWidget::createFullPackagePath()
{
  // Get package path
  std::string package_path_input = stack_path_->getPath();
  std::string full_package_path;

  // Trim whitespace from user input
  boost::trim( package_path_input );

  // check that input is provided
  if( package_path_input.empty() )
  {
    QMessageBox::warning( this, "Error Loading Files", "Please specify a configuration package path to load." );
    return false;
  }

  // Decide if this is a package name or a full path ----------------------------------------------

  // check that the folder exists
  if( !fs::is_directory( package_path_input ) )
  {
    // does not exist, check if its a package
    full_package_path = ros::package::getPath( package_path_input );

    // check that the folder exists
    if( !fs::is_directory( full_package_path ) )
    {
      // error
      QMessageBox::critical( this, "Error Loading Files", "The specified path is not a directory or is not accessable" );
      return false;
    }
  }
  else
  {
    // they inputted a full path
    full_package_path = package_path_input;
  }

  config_data_->config_pkg_path_ = full_package_path;

  return true;
}


// ******************************************************************************************
// ******************************************************************************************
// Class for selecting which mode
// ******************************************************************************************
// ******************************************************************************************

// ******************************************************************************************
// Create the widget
// ******************************************************************************************
SelectModeWidget::SelectModeWidget( QWidget* parent )
  : QFrame(parent)
{
  // Set frame graphics
  setFrameShape(QFrame::StyledPanel);
  setFrameShadow(QFrame::Raised);
  setLineWidth(1);
  setMidLineWidth(0);

  // Basic widget container
  QVBoxLayout *layout = new QVBoxLayout(this);

  // Horizontal layout splitter
  QHBoxLayout *hlayout = new QHBoxLayout();

  // Widget Title
  QLabel * widget_title = new QLabel(this);
  widget_title->setText( "Choose mode:" );
  QFont widget_title_font( "Arial", 12, QFont::Bold );
  widget_title->setFont(widget_title_font);
  layout->addWidget( widget_title);
  layout->setAlignment( widget_title, Qt::AlignTop);

  // Widget Instructions
  QLabel * widget_instructions = new QLabel(this);
  widget_instructions->setText( "All settings for MoveIt are stored in a Moveit configuration package. Here you have the option to create a new configuration package, or load an existing one. Note: any changes to a MoveIt configuration package outside this setup assistant will likely be overwritten by this tool." );
  widget_instructions->setWordWrap(true);
  //widget_instructions->setMinimumWidth(1);
  widget_instructions->setSizePolicy( QSizePolicy::Preferred, QSizePolicy::Preferred );
  layout->addWidget( widget_instructions);
  layout->setAlignment( widget_instructions, Qt::AlignTop);

  // New Button
  btn_new_ = new QPushButton(this);
  btn_new_->setText("Create &New MoveIt\nConfiguration Package");
  hlayout->addWidget( btn_new_ );

  // Exist Button
  btn_exist_ = new QPushButton(this);
  btn_exist_->setText("&Edit Existing MoveIt\nConfiguration Package");
  hlayout->addWidget( btn_exist_ );

  // Add horizontal layer to verticle layer
  layout->addLayout(hlayout);
  setLayout(layout);
}


} // namespace