wpilibc/shared/src/SmartDashboard/SendableChooser.cpp

/*----------------------------------------------------------------------------*/
/* Copyright (c) FIRST 2011. All Rights Reserved.
 */
/* Open Source Software - may be modified and shared by FRC teams. The code   */
/* must be accompanied by the FIRST BSD license file in $(WIND_BASE)/WPILib.  */
/*----------------------------------------------------------------------------*/

#include "SmartDashboard/SendableChooser.h"

#include <stdio.h>

static const std::string kDefault = "default";
static const std::string kOptions = "options";
static const std::string kSelected = "selected";

/**
 * Adds the given object to the list of options.  On the {@link SmartDashboard}
 * on the desktop,
 * the object will appear as the given name.
 * @param name the name of the option
 * @param object the option
 */
void SendableChooser::AddObject(const std::string &name, void *object) {
  m_choices[name] = object;
}

/**
 * Add the given object to the list of options and marks it as the default.
 * Functionally, this is very close to {@link SendableChooser#AddObject(const
 * char *name, void *object) AddObject(...)}
 * except that it will use this as the default option if none other is
 * explicitly selected.
 * @param name the name of the option
 * @param object the option
 */
void SendableChooser::AddDefault(const std::string &name, void *object) {
  m_defaultChoice = name;
  AddObject(name, object);
}

/**
 * Returns the selected option.  If there is none selected, it will return the
 * default.  If there is none selected
 * and no default, then it will return {@code nullptr}.
 * @return the option selected
 */
void *SendableChooser::GetSelected() {
  std::string selected = m_table->GetString(kSelected, m_defaultChoice);
  if (selected == "")
    return nullptr;
  else
    return m_choices[selected];
}

void SendableChooser::InitTable(std::shared_ptr<ITable> subtable) {
  std::vector<std::string> keys;
  m_table = subtable;
  if (m_table != nullptr) {
    std::map<std::string, void *>::iterator iter;
    for (iter = m_choices.begin(); iter != m_choices.end(); iter++) {
      keys.push_back(iter->first);
    }
    m_table->PutValue(kOptions, nt::Value::MakeStringArray(std::move(keys)));
    m_table->PutString(kDefault, m_defaultChoice);
  }
}

std::shared_ptr<ITable> SendableChooser::GetTable() const { return m_table; }

std::string SendableChooser::GetSmartDashboardType() const {
  return "String Chooser";
}