nuttx/libs/libnx/nxmu/nx_getposition.c

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/****************************************************************************
* libs/libnx/nxmu/nx_getposition.c
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/nx/nx.h>
#include <nuttx/nx/nxbe.h>
#include <nuttx/nx/nxmu.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nx_getposition
*
* Description:
* Request the position and size information for the selected window. The
* values will be return asynchronously through the client callback function
* pointer.
*
* Input Parameters:
* hwnd - The window handle
*
* Returned Value:
* OK on success; ERROR on failure with errno set appropriately
*
****************************************************************************/
int nx_getposition(NXWINDOW hwnd)
{
FAR struct nxbe_window_s *wnd = (FAR struct nxbe_window_s *)hwnd;
struct nxsvrmsg_getposition_s outmsg;
#ifdef CONFIG_DEBUG_FEATURES
if (!wnd)
{
set_errno(EINVAL);
return ERROR;
}
#endif
/* Request the size/position info.
*
* It is tempting to just take the positional information from the window
* structure that we have in our hands now. However, we need to run this
* through the server to keep things serialized. There might, for example,
* be a pending size/position change and, in that case, this function would
* return the wrong info.
*/
outmsg.msgid = NX_SVRMSG_GETPOSITION;
outmsg.wnd = wnd;
return nxmu_sendwindow(wnd, &outmsg,
sizeof(struct nxsvrmsg_getposition_s));
}