text: /****************************************************************************
   * graphics/nxsu/nx_constructwindow.c
   *
   *   Copyright (C) 2008-2009, 2012-2013 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. 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.
   * 3. Neither the name NuttX 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "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 THE
   * COPYRIGHT OWNER OR CONTRIBUTORS 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.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdlib.h>
  #include <errno.h>
  #include <debug.h>
  
  #include <nuttx/kmalloc.h>
  #include <nuttx/nx/nx.h>
  
  #include "nxfe.h"
  
  /****************************************************************************
   * Pre-Processor Definitions
   ****************************************************************************/
  
  /****************************************************************************
   * Private Types
   ****************************************************************************/
  
  /****************************************************************************
   * Private Data
   ****************************************************************************/
  
  /****************************************************************************
   * Public Data
   ****************************************************************************/
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: nx_constructwindow
   *
   * Description:
   *   This function is the same a nx_openwindow EXCEPT that the client provides
   *   the window structure instance.  nx_constructwindow will initialize the
   *   the pre-allocated window structure for use by NX.  This function is
   *   provided in addition to nx_open window in order to support a kind of
   *   inheritance:  The caller's window structure may include extensions that
   *   are not visible to NX.
   *
   *   NOTE:  hwnd must have been allocated using a user-space allocator that
   *   permits user access to the window.  Once provided to nx_constructwindow()
   *   that memory is owned and managed by NX.  On certain error conditions or
   *   when the window is closed, NX will free the window.
   *
   * Input Parameters:
   *   handle - The handle returned by nx_connect
   *   hwnd   - The pre-allocated window structure.
   *   cb     - Callbacks used to process window events
   *   arg    - User provided value that will be returned with NX callbacks.
   *
   * Return:
   *   OK on success; ERROR on failure with errno set appropriately.  In the
   *   case of ERROR, NX will have deallocated the pre-allocated window.
   *
   ****************************************************************************/
  
  int nx_constructwindow(NXHANDLE handle, NXWINDOW hwnd,
                         FAR const struct nx_callback_s *cb, FAR void *arg)
  {
    FAR struct nxfe_state_s *fe = (FAR struct nxfe_state_s *)handle;
    FAR struct nxbe_window_s *wnd = (FAR struct nxbe_window_s *)hwnd;
    FAR struct nxbe_state_s *be = &fe->be;
  
  #ifdef CONFIG_DEBUG
    if (!wnd)
      {
        set_errno(EINVAL);
        return ERROR;
      }
  
    if (!fe || !cb)
      {
        kumm_free(wnd);
        errno = EINVAL;
        return ERROR;
      }
  #endif
  
    /* Initialize the window structure */
  
    wnd->be           = be;
    wnd->cb           = cb;
    wnd->arg          = arg;
  
    /* Insert the new window at the top on the display.  topwnd is
     * never NULL (it may point only at the background window, however)
     */
  
    wnd->above        = NULL;
    wnd->below        = be->topwnd;
  
    be->topwnd->above = wnd;
    be->topwnd        = wnd;
  
    /* Report the initialize size/position of the window */
  
    nxfe_reportposition((NXWINDOW)wnd);
  
    /* Provide the initial mouse settings */
  
  #ifdef CONFIG_NX_XYINPUT
    nxsu_mousereport(wnd);
  #endif
  
    return OK;
  }
  