nuttx-apps/include/graphics/nxwidgets/cradiobutton.hxx

/****************************************************************************
 * apps/include/graphics/nxwidgets/cradiobutton.hxx
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 *
 * Portions of this package derive from Woopsi (http://woopsi.org/) and
 * portions are original efforts.  It is difficult to determine at this
 * point what parts are original efforts and which parts derive from Woopsi.
 * However, in any event, the work of  Antony Dzeryn will be acknowledged
 * in most NxWidget files.  Thanks Antony!
 *
 *   Copyright (c) 2007-2011, Antony Dzeryn
 *   All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the names "Woopsi", "Simian Zombie" nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Antony Dzeryn ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Antony Dzeryn BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

#ifndef __APPS_INCLUDE_GRAPHICS_NXWIDGETS_CRADIOBUTTON_HXX
#define __APPS_INCLUDE_GRAPHICS_NXWIDGETS_CRADIOBUTTON_HXX

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <stdint.h>
#include <stdbool.h>

#include <nuttx/nx/nxglib.h>
#include <nuttx/nx/nx.h>

#include "graphics/nxwidgets/cbutton.hxx"
#include "graphics/nxwidgets/cwidgetstyle.hxx"

/****************************************************************************
 * Pre-Processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Implementation Classes
 ****************************************************************************/

#if defined(__cplusplus)

namespace NXWidgets
{
  class CWidgetControl;
  class CRadioButtonGroup;

  /**
   * Represents a radio button.  Radio buttons can only exist as part of a
   * CRadioButtonGroup class, and should not be instantiated individually.
   * Radio buttons are tri-state - off, on and "mu".
   * The mu state cannot be enabled by a user - it can only be set by the
   * developer.
   */

  class CRadioButton : public CButton
  {
  public:

    /**
     * Enum listing all possible radio button states.
     */

    enum RadioButtonState
    {
      RADIO_BUTTON_STATE_OFF = 0,     /**< Radio button is off */
      RADIO_BUTTON_STATE_ON  = 1,     /**< Radio button is on */
      RADIO_BUTTON_STATE_MU  = 2      /**< Radio button is in the third state */
    };

  protected:

    RadioButtonState m_state;    /**< The state of the radio button */

    /**
     * Draw the area of this widget that falls within the clipping region.
     * Called by the redraw() function to draw all visible regions.
     *
     * @param port The CGraphicsPort to draw to.
     * @see redraw()
     */

    virtual void drawContents(CGraphicsPort *port);

    /**
     * Sets the radiobutton's state to "on".
     *
     * @param x The x coordinate of the click.
     * @param y The y coordinate of the click.
     */

    virtual void onClick(nxgl_coord_t x, nxgl_coord_t y);

    /**
     * Destructor.
     */

    virtual inline ~CRadioButton() { }

    /**
     * Copy constructor is protected to prevent usage.
     */

    inline CRadioButton(const CRadioButton &radioButton) : CButton(radioButton) { }

  public:

    /**
     * Constructor.
     *
     * @param pWidgetControl The controlling widget for the display.
     * @param x The x coordinate of the radio button, relative to its
     * parent.
     * @param y The y coordinate of the radio button, relative to its
     * parent.
     * @param width The width of the radio button.
     * @param height The height of the radio button.
     * @param style The style that the widget should use.  If this is not
     * specified, the widget will use the values stored in the global
     * defaultCWidgetStyle object.  The widget will copy the properties of
     * the style into its own internal style object.
     */

    CRadioButton(CWidgetControl *pWidgetControl,
                 nxgl_coord_t x, nxgl_coord_t y,
                 nxgl_coord_t width, nxgl_coord_t height,
                 CWidgetStyle *style = NULL);

    /**
     * Get the current state of the radio button.
     *
     * @return The state of the radio button.
     */

    virtual inline RadioButtonState getState(void)
    {
      return m_state;
    }

    /**
     * Set the state of the radio button.
     *
     * @param state The new radio button state.
     */

    virtual void setState(RadioButtonState state);
  };
}

#endif // __cplusplus

#endif // __APPS_INCLUDE_GRAPHICS_NXWIDGETS_CRADIOBUTTON_HXX