sd/source/ui/inc/tools/AsynchronousCall.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef SD_ASYNCHRONOUS_CALL_HXX
  21 #define SD_ASYNCHRONOUS_CALL_HXX
  22
  23 #include <vcl/timer.hxx>
  24 #include <memory>
  25 #include <boost/function.hpp>
  26
  27 namespace sd { namespace tools {
  28
  29
  30 /** Store a function object and execute it asynchronous.
  31
  32     The features of this class are:
  33     a) It provides a wrapper around a VCL Timer so that generic function
  34     objects can be used.
  35     b) When more than one function objects are posted to be executed later
  36     then the pending ones are erased and only the last one will actually be
  37     executed.
  38
  39     Use this class like this:
  40     aInstanceOfAsynchronousCall.Post(
  41         ::boost::bind(
  42             ::std::mem_fun(&DrawViewShell::SwitchPage),
  43             pDrawViewShell,
  44             11));
  45 */
  46 class AsynchronousCall
  47 {
  48 public:
  49     /** Create a new asynchronous call.  Each object of this class processes
  50         one (semantical) type of call.
  51     */
  52     AsynchronousCall (void);
  53
  54     ~AsynchronousCall (void);
  55
  56     /** Post a function object that is to be executed asynchronously.  When
  57         this method is called while the current function object has not bee
  58         executed then the later is destroyed and only the given function
  59         object will be executed.
  60         @param rFunction
  61             The function object that may be called asynchronously in the
  62             near future.
  63         @param nTimeoutInMilliseconds
  64             The timeout in milliseconds until the function object is
  65             executed.
  66     */
  67     typedef ::boost::function0<void> AsynchronousFunction;
  68     void Post (
  69         const AsynchronousFunction& rFunction,
  70         sal_uInt32 nTimeoutInMilliseconds=10);
  71
  72 private:
  73     Timer maTimer;
  74     /** The function object that will be executed when the TimerCallback
  75         function is called the next time.  This pointer may be NULL.
  76     */
  77     ::std::auto_ptr<AsynchronousFunction> mpFunction;
  78     DECL_LINK(TimerCallback,Timer*);
  79 };
  80
  81
  82 } } // end of namespace ::sd::tools
  83
  84 #endif
  85
  86 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */